/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library. If not, see . */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "config.h" #include "gtkscrolledwindow.h" #include "gtkadjustment.h" #include "gtkbindings.h" #include "gtkdnd.h" #include "gtkintl.h" #include "gtkmain.h" #include "gtkmarshalers.h" #include "gtkprivate.h" #include "gtkscrollable.h" #include "gtkscrollbar.h" #include "gtkrangeprivate.h" #include "gtktypebuiltins.h" #include "gtkviewport.h" #include "gtkwidgetprivate.h" #include "gtkwindow.h" #include "gtkkineticscrolling.h" #include "a11y/gtkscrolledwindowaccessible.h" #include /** * SECTION:gtkscrolledwindow * @Short_description: Adds scrollbars to its child widget * @Title: GtkScrolledWindow * @See_also: #GtkScrollable, #GtkViewport, #GtkAdjustment * * #GtkScrolledWindow is a #GtkBin subclass: it’s a container * the accepts a single child widget. #GtkScrolledWindow adds scrollbars * to the child widget and optionally draws a beveled frame around the * child widget. * * The scrolled window can work in two ways. Some widgets have native * scrolling support; these widgets implement the #GtkScrollable interface. * Widgets with native scroll support include #GtkTreeView, #GtkTextView, * and #GtkLayout. * * For widgets that lack native scrolling support, the #GtkViewport * widget acts as an adaptor class, implementing scrollability for child * widgets that lack their own scrolling capabilities. Use #GtkViewport * to scroll child widgets such as #GtkGrid, #GtkBox, and so on. * * If a widget has native scrolling abilities, it can be added to the * #GtkScrolledWindow with gtk_container_add(). If a widget does not, you * must first add the widget to a #GtkViewport, then add the #GtkViewport * to the scrolled window. gtk_container_add() will do this for you for * widgets that don’t implement #GtkScrollable natively, so you can * ignore the presence of the viewport. * * The position of the scrollbars is controlled by the scroll * adjustments. See #GtkAdjustment for the fields in an adjustment - for * #GtkScrollbar, used by #GtkScrolledWindow, the “value” field * represents the position of the scrollbar, which must be between the * “lower” field and “upper - page_size.” The “page_size” field * represents the size of the visible scrollable area. The * “step_increment” and “page_increment” fields are used when the user * asks to step down (using the small stepper arrows) or page down (using * for example the PageDown key). * * If a #GtkScrolledWindow doesn’t behave quite as you would like, or * doesn’t have exactly the right layout, it’s very possible to set up * your own scrolling with #GtkScrollbar and for example a #GtkGrid. */ /* scrolled window policy and size requisition handling: * * gtk size requisition works as follows: * a widget upon size-request reports the width and height that it finds * to be best suited to display its contents, including children. * the width and/or height reported from a widget upon size requisition * may be overidden by the user by specifying a width and/or height * other than 0 through gtk_widget_set_size_request(). * * a scrolled window needs (for implementing all three policy types) to * request its width and height based on two different rationales. * 1) the user wants the scrolled window to just fit into the space * that it gets allocated for a specifc dimension. * 1.1) this does not apply if the user specified a concrete value * value for that specific dimension by either specifying usize for the * scrolled window or for its child. * 2) the user wants the scrolled window to take as much space up as * is desired by the child for a specifc dimension (i.e. POLICY_NEVER). * * also, kinda obvious: * 3) a user would certainly not have choosen a scrolled window as a container * for the child, if the resulting allocation takes up more space than the * child would have allocated without the scrolled window. * * conclusions: * A) from 1) follows: the scrolled window shouldn’t request more space for a * specifc dimension than is required at minimum. * B) from 1.1) follows: the requisition may be overidden by usize of the scrolled * window (done automatically) or by usize of the child (needs to be checked). * C) from 2) follows: for POLICY_NEVER, the scrolled window simply reports the * child’s dimension. * D) from 3) follows: the scrolled window child’s minimum width and minimum height * under A) at least correspond to the space taken up by its scrollbars. */ #define DEFAULT_SCROLLBAR_SPACING 3 #define TOUCH_BYPASS_CAPTURED_THRESHOLD 30 /* Kinetic scrolling */ #define MAX_OVERSHOOT_DISTANCE 50 #define DECELERATION_FRICTION 4 #define OVERSHOOT_FRICTION 20 struct _GtkScrolledWindowPrivate { GtkWidget *hscrollbar; GtkWidget *vscrollbar; GtkCornerType window_placement; guint16 shadow_type; guint hscrollbar_policy : 2; guint vscrollbar_policy : 2; guint hscrollbar_visible : 1; guint vscrollbar_visible : 1; guint focus_out : 1; /* Flag used by ::move-focus-out implementation */ gint min_content_width; gint min_content_height; /* Kinetic scrolling */ GtkGesture *long_press_gesture; GtkGesture *swipe_gesture; /* These two gestures are mutually exclusive */ GtkGesture *drag_gesture; GtkGesture *pan_gesture; gdouble drag_start_x; gdouble drag_start_y; GdkWindow *overshoot_window; GdkDevice *drag_device; guint kinetic_scrolling : 1; guint capture_button_press : 1; guint in_drag : 1; guint deceleration_id; gdouble x_velocity; gdouble y_velocity; gdouble unclamped_hadj_value; gdouble unclamped_vadj_value; }; typedef struct { GtkScrolledWindow *scrolled_window; gint64 last_deceleration_time; GtkKineticScrolling *hscrolling; GtkKineticScrolling *vscrolling; } KineticScrollData; enum { PROP_0, PROP_HADJUSTMENT, PROP_VADJUSTMENT, PROP_HSCROLLBAR_POLICY, PROP_VSCROLLBAR_POLICY, PROP_WINDOW_PLACEMENT, PROP_WINDOW_PLACEMENT_SET, PROP_SHADOW_TYPE, PROP_MIN_CONTENT_WIDTH, PROP_MIN_CONTENT_HEIGHT, PROP_KINETIC_SCROLLING }; /* Signals */ enum { SCROLL_CHILD, MOVE_FOCUS_OUT, LAST_SIGNAL }; static void gtk_scrolled_window_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gtk_scrolled_window_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void gtk_scrolled_window_destroy (GtkWidget *widget); static gboolean gtk_scrolled_window_draw (GtkWidget *widget, cairo_t *cr); static void gtk_scrolled_window_size_allocate (GtkWidget *widget, GtkAllocation *allocation); static gboolean gtk_scrolled_window_scroll_event (GtkWidget *widget, GdkEventScroll *event); static gboolean gtk_scrolled_window_focus (GtkWidget *widget, GtkDirectionType direction); static void gtk_scrolled_window_add (GtkContainer *container, GtkWidget *widget); static void gtk_scrolled_window_remove (GtkContainer *container, GtkWidget *widget); static void gtk_scrolled_window_forall (GtkContainer *container, gboolean include_internals, GtkCallback callback, gpointer callback_data); static gboolean gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window, GtkScrollType scroll, gboolean horizontal); static void gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window, GtkDirectionType direction_type); static void gtk_scrolled_window_relative_allocation(GtkWidget *widget, GtkAllocation *allocation); static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment, gpointer data); static void gtk_scrolled_window_adjustment_value_changed (GtkAdjustment *adjustment, gpointer data); static void gtk_scrolled_window_get_preferred_width (GtkWidget *widget, gint *minimum_size, gint *natural_size); static void gtk_scrolled_window_get_preferred_height (GtkWidget *widget, gint *minimum_size, gint *natural_size); static void gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *layout, gint width, gint *minimum_height, gint *natural_height); static void gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *layout, gint width, gint *minimum_height, gint *natural_height); static void gtk_scrolled_window_realize (GtkWidget *widget); static void gtk_scrolled_window_unrealize (GtkWidget *widget); static void gtk_scrolled_window_map (GtkWidget *widget); static void gtk_scrolled_window_unmap (GtkWidget *widget); static void gtk_scrolled_window_grab_notify (GtkWidget *widget, gboolean was_grabbed); static gboolean _gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window, GtkAdjustment *adjustment, gdouble value, gboolean allow_overshooting, gboolean snap_to_border); static void gtk_scrolled_window_cancel_deceleration (GtkScrolledWindow *scrolled_window); static gboolean _gtk_scrolled_window_get_overshoot (GtkScrolledWindow *scrolled_window, gint *overshoot_x, gint *overshoot_y); static void _gtk_scrolled_window_allocate_overshoot_window (GtkScrolledWindow *scrolled_window); static void gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window); static guint signals[LAST_SIGNAL] = {0}; G_DEFINE_TYPE_WITH_PRIVATE (GtkScrolledWindow, gtk_scrolled_window, GTK_TYPE_BIN) static void add_scroll_binding (GtkBindingSet *binding_set, guint keyval, GdkModifierType mask, GtkScrollType scroll, gboolean horizontal) { guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left; gtk_binding_entry_add_signal (binding_set, keyval, mask, "scroll-child", 2, GTK_TYPE_SCROLL_TYPE, scroll, G_TYPE_BOOLEAN, horizontal); gtk_binding_entry_add_signal (binding_set, keypad_keyval, mask, "scroll-child", 2, GTK_TYPE_SCROLL_TYPE, scroll, G_TYPE_BOOLEAN, horizontal); } static void add_tab_bindings (GtkBindingSet *binding_set, GdkModifierType modifiers, GtkDirectionType direction) { gtk_binding_entry_add_signal (binding_set, GDK_KEY_Tab, modifiers, "move-focus-out", 1, GTK_TYPE_DIRECTION_TYPE, direction); gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Tab, modifiers, "move-focus-out", 1, GTK_TYPE_DIRECTION_TYPE, direction); } static void gtk_scrolled_window_class_init (GtkScrolledWindowClass *class) { GObjectClass *gobject_class = G_OBJECT_CLASS (class); GtkWidgetClass *widget_class; GtkContainerClass *container_class; GtkBindingSet *binding_set; widget_class = (GtkWidgetClass*) class; container_class = (GtkContainerClass*) class; gobject_class->set_property = gtk_scrolled_window_set_property; gobject_class->get_property = gtk_scrolled_window_get_property; widget_class->destroy = gtk_scrolled_window_destroy; widget_class->draw = gtk_scrolled_window_draw; widget_class->size_allocate = gtk_scrolled_window_size_allocate; widget_class->scroll_event = gtk_scrolled_window_scroll_event; widget_class->focus = gtk_scrolled_window_focus; widget_class->get_preferred_width = gtk_scrolled_window_get_preferred_width; widget_class->get_preferred_height = gtk_scrolled_window_get_preferred_height; widget_class->get_preferred_height_for_width = gtk_scrolled_window_get_preferred_height_for_width; widget_class->get_preferred_width_for_height = gtk_scrolled_window_get_preferred_width_for_height; widget_class->realize = gtk_scrolled_window_realize; widget_class->unrealize = gtk_scrolled_window_unrealize; widget_class->map = gtk_scrolled_window_map; widget_class->unmap = gtk_scrolled_window_unmap; widget_class->grab_notify = gtk_scrolled_window_grab_notify; container_class->add = gtk_scrolled_window_add; container_class->remove = gtk_scrolled_window_remove; container_class->forall = gtk_scrolled_window_forall; gtk_container_class_handle_border_width (container_class); class->scrollbar_spacing = -1; class->scroll_child = gtk_scrolled_window_scroll_child; class->move_focus_out = gtk_scrolled_window_move_focus_out; g_object_class_install_property (gobject_class, PROP_HADJUSTMENT, g_param_spec_object ("hadjustment", P_("Horizontal Adjustment"), P_("The GtkAdjustment for the horizontal position"), GTK_TYPE_ADJUSTMENT, GTK_PARAM_READWRITE|G_PARAM_CONSTRUCT)); g_object_class_install_property (gobject_class, PROP_VADJUSTMENT, g_param_spec_object ("vadjustment", P_("Vertical Adjustment"), P_("The GtkAdjustment for the vertical position"), GTK_TYPE_ADJUSTMENT, GTK_PARAM_READWRITE|G_PARAM_CONSTRUCT)); g_object_class_install_property (gobject_class, PROP_HSCROLLBAR_POLICY, g_param_spec_enum ("hscrollbar-policy", P_("Horizontal Scrollbar Policy"), P_("When the horizontal scrollbar is displayed"), GTK_TYPE_POLICY_TYPE, GTK_POLICY_AUTOMATIC, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); g_object_class_install_property (gobject_class, PROP_VSCROLLBAR_POLICY, g_param_spec_enum ("vscrollbar-policy", P_("Vertical Scrollbar Policy"), P_("When the vertical scrollbar is displayed"), GTK_TYPE_POLICY_TYPE, GTK_POLICY_AUTOMATIC, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); g_object_class_install_property (gobject_class, PROP_WINDOW_PLACEMENT, g_param_spec_enum ("window-placement", P_("Window Placement"), P_("Where the contents are located with respect to the scrollbars."), GTK_TYPE_CORNER_TYPE, GTK_CORNER_TOP_LEFT, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); /** * GtkScrolledWindow:window-placement-set: * * Whether "window-placement" should be used to determine the location * of the contents with respect to the scrollbars. * * Since: 2.10 * * Deprecated: 3.10: This value is ignored and * #GtkScrolledWindow:window-placement value is always honored. */ g_object_class_install_property (gobject_class, PROP_WINDOW_PLACEMENT_SET, g_param_spec_boolean ("window-placement-set", P_("Window Placement Set"), P_("Whether \"window-placement\" should be used to determine the location of the contents with respect to the scrollbars."), TRUE, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); g_object_class_install_property (gobject_class, PROP_SHADOW_TYPE, g_param_spec_enum ("shadow-type", P_("Shadow Type"), P_("Style of bevel around the contents"), GTK_TYPE_SHADOW_TYPE, GTK_SHADOW_NONE, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); /** * GtkScrolledWindow:scrollbars-within-bevel: * * Whether to place scrollbars within the scrolled window's bevel. * * Since: 2.12 */ gtk_widget_class_install_style_property (widget_class, g_param_spec_boolean ("scrollbars-within-bevel", P_("Scrollbars within bevel"), P_("Place scrollbars within the scrolled window's bevel"), FALSE, GTK_PARAM_READABLE)); gtk_widget_class_install_style_property (widget_class, g_param_spec_int ("scrollbar-spacing", P_("Scrollbar spacing"), P_("Number of pixels between the scrollbars and the scrolled window"), 0, G_MAXINT, DEFAULT_SCROLLBAR_SPACING, GTK_PARAM_READABLE)); /** * GtkScrolledWindow:min-content-width: * * The minimum content width of @scrolled_window, or -1 if not set. * * Since: 3.0 */ g_object_class_install_property (gobject_class, PROP_MIN_CONTENT_WIDTH, g_param_spec_int ("min-content-width", P_("Minimum Content Width"), P_("The minimum width that the scrolled window will allocate to its content"), -1, G_MAXINT, -1, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); /** * GtkScrolledWindow:min-content-height: * * The minimum content height of @scrolled_window, or -1 if not set. * * Since: 3.0 */ g_object_class_install_property (gobject_class, PROP_MIN_CONTENT_HEIGHT, g_param_spec_int ("min-content-height", P_("Minimum Content Height"), P_("The minimum height that the scrolled window will allocate to its content"), -1, G_MAXINT, -1, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); /** * GtkScrolledWindow:kinetic-scrolling: * * The kinetic scrolling behavior flags. Kinetic scrolling * only applies to devices with source %GDK_SOURCE_TOUCHSCREEN * * Since: 3.4 */ g_object_class_install_property (gobject_class, PROP_KINETIC_SCROLLING, g_param_spec_boolean ("kinetic-scrolling", P_("Kinetic Scrolling"), P_("Kinetic scrolling mode."), TRUE, GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY)); /** * GtkScrolledWindow::scroll-child: * @scrolled_window: a #GtkScrolledWindow * @scroll: a #GtkScrollType describing how much to scroll * @horizontal: whether the keybinding scrolls the child * horizontally or not * * The ::scroll-child signal is a * [keybinding signal][GtkBindingSignal] * which gets emitted when a keybinding that scrolls is pressed. * The horizontal or vertical adjustment is updated which triggers a * signal that the scrolled windows child may listen to and scroll itself. */ signals[SCROLL_CHILD] = g_signal_new (I_("scroll-child"), G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GtkScrolledWindowClass, scroll_child), NULL, NULL, _gtk_marshal_BOOLEAN__ENUM_BOOLEAN, G_TYPE_BOOLEAN, 2, GTK_TYPE_SCROLL_TYPE, G_TYPE_BOOLEAN); /** * GtkScrolledWindow::move-focus-out: * @scrolled_window: a #GtkScrolledWindow * @direction_type: either %GTK_DIR_TAB_FORWARD or * %GTK_DIR_TAB_BACKWARD * * The ::move-focus-out signal is a * [keybinding signal][GtkBindingSignal] which gets * emitted when focus is moved away from the scrolled window by a * keybinding. The #GtkWidget::move-focus signal is emitted with * @direction_type on this scrolled windows toplevel parent in the * container hierarchy. The default bindings for this signal are * `Tab + Ctrl` and `Tab + Ctrl + Shift`. */ signals[MOVE_FOCUS_OUT] = g_signal_new (I_("move-focus-out"), G_TYPE_FROM_CLASS (gobject_class), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GtkScrolledWindowClass, move_focus_out), NULL, NULL, _gtk_marshal_VOID__ENUM, G_TYPE_NONE, 1, GTK_TYPE_DIRECTION_TYPE); binding_set = gtk_binding_set_by_class (class); add_scroll_binding (binding_set, GDK_KEY_Left, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, TRUE); add_scroll_binding (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, TRUE); add_scroll_binding (binding_set, GDK_KEY_Up, GDK_CONTROL_MASK, GTK_SCROLL_STEP_BACKWARD, FALSE); add_scroll_binding (binding_set, GDK_KEY_Down, GDK_CONTROL_MASK, GTK_SCROLL_STEP_FORWARD, FALSE); add_scroll_binding (binding_set, GDK_KEY_Page_Up, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_BACKWARD, TRUE); add_scroll_binding (binding_set, GDK_KEY_Page_Down, GDK_CONTROL_MASK, GTK_SCROLL_PAGE_FORWARD, TRUE); add_scroll_binding (binding_set, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, FALSE); add_scroll_binding (binding_set, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, FALSE); add_scroll_binding (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, TRUE); add_scroll_binding (binding_set, GDK_KEY_End, GDK_CONTROL_MASK, GTK_SCROLL_END, TRUE); add_scroll_binding (binding_set, GDK_KEY_Home, 0, GTK_SCROLL_START, FALSE); add_scroll_binding (binding_set, GDK_KEY_End, 0, GTK_SCROLL_END, FALSE); add_tab_bindings (binding_set, GDK_CONTROL_MASK, GTK_DIR_TAB_FORWARD); add_tab_bindings (binding_set, GDK_CONTROL_MASK | GDK_SHIFT_MASK, GTK_DIR_TAB_BACKWARD); gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCROLLED_WINDOW_ACCESSIBLE); } static void scrolled_window_drag_begin_cb (GtkScrolledWindow *scrolled_window, gdouble start_x, gdouble start_y, GtkGesture *gesture) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkEventSequenceState state; GdkEventSequence *sequence; GtkWidget *event_widget; const GdkEvent *event; priv->in_drag = FALSE; priv->drag_start_x = priv->unclamped_hadj_value; priv->drag_start_y = priv->unclamped_vadj_value; gtk_scrolled_window_cancel_deceleration (scrolled_window); sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture)); event = gtk_gesture_get_last_event (gesture, sequence); event_widget = gtk_get_event_widget ((GdkEvent *) event); if (event_widget == priv->vscrollbar || event_widget == priv->hscrollbar || (!priv->hscrollbar_visible && !priv->vscrollbar_visible)) state = GTK_EVENT_SEQUENCE_DENIED; else if (priv->capture_button_press) state = GTK_EVENT_SEQUENCE_CLAIMED; else return; gtk_gesture_set_sequence_state (gesture, sequence, state); } static void scrolled_window_drag_update_cb (GtkScrolledWindow *scrolled_window, gdouble offset_x, gdouble offset_y, GtkGesture *gesture) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; gint old_overshoot_x, old_overshoot_y; gint new_overshoot_x, new_overshoot_y; GtkAdjustment *hadjustment; GtkAdjustment *vadjustment; gdouble dx, dy; if (!priv->capture_button_press) { GdkEventSequence *sequence; sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture)); gtk_gesture_set_sequence_state (gesture, sequence, GTK_EVENT_SEQUENCE_CLAIMED); } _gtk_scrolled_window_get_overshoot (scrolled_window, &old_overshoot_x, &old_overshoot_y); hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); if (hadjustment && priv->hscrollbar_visible) { dx = priv->drag_start_x - offset_x; _gtk_scrolled_window_set_adjustment_value (scrolled_window, hadjustment, dx, TRUE, FALSE); } vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); if (vadjustment && priv->vscrollbar_visible) { dy = priv->drag_start_y - offset_y; _gtk_scrolled_window_set_adjustment_value (scrolled_window, vadjustment, dy, TRUE, FALSE); } _gtk_scrolled_window_get_overshoot (scrolled_window, &new_overshoot_x, &new_overshoot_y); if (old_overshoot_x != new_overshoot_x || old_overshoot_y != new_overshoot_y) { if (new_overshoot_x >= 0 || new_overshoot_y >= 0) { /* We need to reallocate the widget to have it at * negative offset, so there's a "gravity" on the * bottom/right corner */ gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); } else if (new_overshoot_x < 0 || new_overshoot_y < 0) _gtk_scrolled_window_allocate_overshoot_window (scrolled_window); } } static void scrolled_window_drag_end_cb (GtkScrolledWindow *scrolled_window, GdkEventSequence *sequence, GtkGesture *gesture) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; if (!priv->in_drag || !gtk_gesture_handles_sequence (gesture, sequence)) gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED); } static void scrolled_window_swipe_cb (GtkScrolledWindow *scrolled_window, gdouble x_velocity, gdouble y_velocity) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; gboolean overshoot; overshoot = _gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL); priv->x_velocity = -x_velocity; priv->y_velocity = -y_velocity; /* Zero out vector components without a visible scrollbar */ if (!priv->hscrollbar_visible) priv->x_velocity = 0; if (!priv->vscrollbar_visible) priv->y_velocity = 0; if (priv->x_velocity != 0 || priv->y_velocity != 0 || overshoot) { gtk_scrolled_window_start_deceleration (scrolled_window); priv->x_velocity = priv->y_velocity = 0; } } static void scrolled_window_long_press_cb (GtkScrolledWindow *scrolled_window, gdouble x, gdouble y, GtkGesture *gesture) { GdkEventSequence *sequence; sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture)); gtk_gesture_set_sequence_state (gesture, sequence, GTK_EVENT_SEQUENCE_DENIED); } static void scrolled_window_long_press_cancelled_cb (GtkScrolledWindow *scrolled_window, GtkGesture *gesture) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GdkEventSequence *sequence; const GdkEvent *event; sequence = gtk_gesture_get_last_updated_sequence (gesture); event = gtk_gesture_get_last_event (gesture, sequence); if (event->type == GDK_TOUCH_BEGIN || event->type == GDK_BUTTON_PRESS) gtk_gesture_set_sequence_state (gesture, sequence, GTK_EVENT_SEQUENCE_DENIED); else if (event->type != GDK_TOUCH_END && event->type != GDK_BUTTON_RELEASE) priv->in_drag = TRUE; } static void gtk_scrolled_window_check_attach_pan_gesture (GtkScrolledWindow *sw) { GtkPropagationPhase phase = GTK_PHASE_NONE; GtkScrolledWindowPrivate *priv = sw->priv; if (priv->kinetic_scrolling && ((priv->hscrollbar_visible && !priv->vscrollbar_visible) || (!priv->hscrollbar_visible && priv->vscrollbar_visible))) { GtkOrientation orientation; if (priv->hscrollbar_visible) orientation = GTK_ORIENTATION_HORIZONTAL; else orientation = GTK_ORIENTATION_VERTICAL; gtk_gesture_pan_set_orientation (GTK_GESTURE_PAN (priv->pan_gesture), orientation); phase = GTK_PHASE_CAPTURE; } gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->pan_gesture), phase); } static void gtk_scrolled_window_init (GtkScrolledWindow *scrolled_window) { GtkWidget *widget = GTK_WIDGET (scrolled_window); GtkScrolledWindowPrivate *priv; scrolled_window->priv = priv = gtk_scrolled_window_get_instance_private (scrolled_window); gtk_widget_set_has_window (widget, FALSE); gtk_widget_set_can_focus (widget, TRUE); /* Instantiated by gtk_scrolled_window_set_[hv]adjustment * which are both construct properties */ priv->hscrollbar = NULL; priv->vscrollbar = NULL; priv->hscrollbar_policy = GTK_POLICY_AUTOMATIC; priv->vscrollbar_policy = GTK_POLICY_AUTOMATIC; priv->hscrollbar_visible = FALSE; priv->vscrollbar_visible = FALSE; priv->focus_out = FALSE; priv->window_placement = GTK_CORNER_TOP_LEFT; priv->min_content_width = -1; priv->min_content_height = -1; priv->drag_gesture = gtk_gesture_drag_new (widget); gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->drag_gesture), 1); g_signal_connect_swapped (priv->drag_gesture, "drag-begin", G_CALLBACK (scrolled_window_drag_begin_cb), scrolled_window); g_signal_connect_swapped (priv->drag_gesture, "drag-update", G_CALLBACK (scrolled_window_drag_update_cb), scrolled_window); g_signal_connect_swapped (priv->drag_gesture, "end", G_CALLBACK (scrolled_window_drag_end_cb), scrolled_window); priv->pan_gesture = gtk_gesture_pan_new (widget, GTK_ORIENTATION_VERTICAL); gtk_gesture_group (priv->pan_gesture, priv->drag_gesture); gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->pan_gesture), 1); priv->swipe_gesture = gtk_gesture_swipe_new (widget); gtk_gesture_group (priv->swipe_gesture, priv->drag_gesture); gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->swipe_gesture), 1); g_signal_connect_swapped (priv->swipe_gesture, "swipe", G_CALLBACK (scrolled_window_swipe_cb), scrolled_window); priv->long_press_gesture = gtk_gesture_long_press_new (widget); gtk_gesture_group (priv->long_press_gesture, priv->drag_gesture); gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->long_press_gesture), 1); g_signal_connect_swapped (priv->long_press_gesture, "pressed", G_CALLBACK (scrolled_window_long_press_cb), scrolled_window); g_signal_connect_swapped (priv->long_press_gesture, "cancelled", G_CALLBACK (scrolled_window_long_press_cancelled_cb), scrolled_window); gtk_scrolled_window_set_kinetic_scrolling (scrolled_window, TRUE); gtk_scrolled_window_set_capture_button_press (scrolled_window, TRUE); } /** * gtk_scrolled_window_new: * @hadjustment: (allow-none): horizontal adjustment * @vadjustment: (allow-none): vertical adjustment * * Creates a new scrolled window. * * The two arguments are the scrolled window’s adjustments; these will be * shared with the scrollbars and the child widget to keep the bars in sync * with the child. Usually you want to pass %NULL for the adjustments, which * will cause the scrolled window to create them for you. * * Returns: a new scrolled window */ GtkWidget* gtk_scrolled_window_new (GtkAdjustment *hadjustment, GtkAdjustment *vadjustment) { GtkWidget *scrolled_window; if (hadjustment) g_return_val_if_fail (GTK_IS_ADJUSTMENT (hadjustment), NULL); if (vadjustment) g_return_val_if_fail (GTK_IS_ADJUSTMENT (vadjustment), NULL); scrolled_window = g_object_new (GTK_TYPE_SCROLLED_WINDOW, "hadjustment", hadjustment, "vadjustment", vadjustment, NULL); return scrolled_window; } /** * gtk_scrolled_window_set_hadjustment: * @scrolled_window: a #GtkScrolledWindow * @hadjustment: horizontal scroll adjustment * * Sets the #GtkAdjustment for the horizontal scrollbar. */ void gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window, GtkAdjustment *hadjustment) { GtkScrolledWindowPrivate *priv; GtkBin *bin; GtkWidget *child; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); if (hadjustment) g_return_if_fail (GTK_IS_ADJUSTMENT (hadjustment)); else hadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL); bin = GTK_BIN (scrolled_window); priv = scrolled_window->priv; if (!priv->hscrollbar) { priv->hscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_HORIZONTAL, hadjustment); gtk_widget_set_parent (priv->hscrollbar, GTK_WIDGET (scrolled_window)); g_object_ref (priv->hscrollbar); gtk_widget_show (priv->hscrollbar); } else { GtkAdjustment *old_adjustment; old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); if (old_adjustment == hadjustment) return; g_signal_handlers_disconnect_by_func (old_adjustment, gtk_scrolled_window_adjustment_changed, scrolled_window); gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar), hadjustment); } hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); g_signal_connect (hadjustment, "changed", G_CALLBACK (gtk_scrolled_window_adjustment_changed), scrolled_window); g_signal_connect (hadjustment, "value-changed", G_CALLBACK (gtk_scrolled_window_adjustment_value_changed), scrolled_window); gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window); gtk_scrolled_window_adjustment_value_changed (hadjustment, scrolled_window); child = gtk_bin_get_child (bin); if (GTK_IS_SCROLLABLE (child)) gtk_scrollable_set_hadjustment (GTK_SCROLLABLE (child), hadjustment); g_object_notify (G_OBJECT (scrolled_window), "hadjustment"); } /** * gtk_scrolled_window_set_vadjustment: * @scrolled_window: a #GtkScrolledWindow * @vadjustment: vertical scroll adjustment * * Sets the #GtkAdjustment for the vertical scrollbar. */ void gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window, GtkAdjustment *vadjustment) { GtkScrolledWindowPrivate *priv; GtkBin *bin; GtkWidget *child; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); if (vadjustment) g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment)); else vadjustment = (GtkAdjustment*) g_object_new (GTK_TYPE_ADJUSTMENT, NULL); bin = GTK_BIN (scrolled_window); priv = scrolled_window->priv; if (!priv->vscrollbar) { priv->vscrollbar = gtk_scrollbar_new (GTK_ORIENTATION_VERTICAL, vadjustment); gtk_widget_set_parent (priv->vscrollbar, GTK_WIDGET (scrolled_window)); g_object_ref (priv->vscrollbar); gtk_widget_show (priv->vscrollbar); } else { GtkAdjustment *old_adjustment; old_adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); if (old_adjustment == vadjustment) return; g_signal_handlers_disconnect_by_func (old_adjustment, gtk_scrolled_window_adjustment_changed, scrolled_window); gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar), vadjustment); } vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); g_signal_connect (vadjustment, "changed", G_CALLBACK (gtk_scrolled_window_adjustment_changed), scrolled_window); g_signal_connect (vadjustment, "value-changed", G_CALLBACK (gtk_scrolled_window_adjustment_value_changed), scrolled_window); gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window); gtk_scrolled_window_adjustment_value_changed (vadjustment, scrolled_window); child = gtk_bin_get_child (bin); if (GTK_IS_SCROLLABLE (child)) gtk_scrollable_set_vadjustment (GTK_SCROLLABLE (child), vadjustment); g_object_notify (G_OBJECT (scrolled_window), "vadjustment"); } /** * gtk_scrolled_window_get_hadjustment: * @scrolled_window: a #GtkScrolledWindow * * Returns the horizontal scrollbar’s adjustment, used to connect the * horizontal scrollbar to the child widget’s horizontal scroll * functionality. * * Returns: (transfer none): the horizontal #GtkAdjustment */ GtkAdjustment* gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window) { GtkScrolledWindowPrivate *priv; g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL); priv = scrolled_window->priv; return gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); } /** * gtk_scrolled_window_get_vadjustment: * @scrolled_window: a #GtkScrolledWindow * * Returns the vertical scrollbar’s adjustment, used to connect the * vertical scrollbar to the child widget’s vertical scroll functionality. * * Returns: (transfer none): the vertical #GtkAdjustment */ GtkAdjustment* gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window) { GtkScrolledWindowPrivate *priv; g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL); priv = scrolled_window->priv; return gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); } /** * gtk_scrolled_window_get_hscrollbar: * @scrolled_window: a #GtkScrolledWindow * * Returns the horizontal scrollbar of @scrolled_window. * * Returns: (transfer none): the horizontal scrollbar of the scrolled window. * * Since: 2.8 */ GtkWidget* gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL); return scrolled_window->priv->hscrollbar; } /** * gtk_scrolled_window_get_vscrollbar: * @scrolled_window: a #GtkScrolledWindow * * Returns the vertical scrollbar of @scrolled_window. * * Returns: (transfer none): the vertical scrollbar of the scrolled window. * * Since: 2.8 */ GtkWidget* gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL); return scrolled_window->priv->vscrollbar; } /** * gtk_scrolled_window_set_policy: * @scrolled_window: a #GtkScrolledWindow * @hscrollbar_policy: policy for horizontal bar * @vscrollbar_policy: policy for vertical bar * * Sets the scrollbar policy for the horizontal and vertical scrollbars. * * The policy determines when the scrollbar should appear; it is a value * from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the * scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is * never present; if %GTK_POLICY_AUTOMATIC, the scrollbar is present only * if needed (that is, if the slider part of the bar would be smaller * than the trough - the display is larger than the page size). */ void gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window, GtkPolicyType hscrollbar_policy, GtkPolicyType vscrollbar_policy) { GtkScrolledWindowPrivate *priv; GObject *object = G_OBJECT (scrolled_window); g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); priv = scrolled_window->priv; if ((priv->hscrollbar_policy != hscrollbar_policy) || (priv->vscrollbar_policy != vscrollbar_policy)) { priv->hscrollbar_policy = hscrollbar_policy; priv->vscrollbar_policy = vscrollbar_policy; gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); g_object_freeze_notify (object); g_object_notify (object, "hscrollbar-policy"); g_object_notify (object, "vscrollbar-policy"); g_object_thaw_notify (object); } } /** * gtk_scrolled_window_get_policy: * @scrolled_window: a #GtkScrolledWindow * @hscrollbar_policy: (out) (allow-none): location to store the policy * for the horizontal scrollbar, or %NULL. * @vscrollbar_policy: (out) (allow-none): location to store the policy * for the vertical scrollbar, or %NULL. * * Retrieves the current policy values for the horizontal and vertical * scrollbars. See gtk_scrolled_window_set_policy(). */ void gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window, GtkPolicyType *hscrollbar_policy, GtkPolicyType *vscrollbar_policy) { GtkScrolledWindowPrivate *priv; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); priv = scrolled_window->priv; if (hscrollbar_policy) *hscrollbar_policy = priv->hscrollbar_policy; if (vscrollbar_policy) *vscrollbar_policy = priv->vscrollbar_policy; } static void gtk_scrolled_window_set_placement_internal (GtkScrolledWindow *scrolled_window, GtkCornerType window_placement) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; if (priv->window_placement != window_placement) { priv->window_placement = window_placement; gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); g_object_notify (G_OBJECT (scrolled_window), "window-placement"); } } /** * gtk_scrolled_window_set_placement: * @scrolled_window: a #GtkScrolledWindow * @window_placement: position of the child window * * Sets the placement of the contents with respect to the scrollbars * for the scrolled window. * * The default is %GTK_CORNER_TOP_LEFT, meaning the child is * in the top left, with the scrollbars underneath and to the right. * Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT, * %GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT. * * See also gtk_scrolled_window_get_placement() and * gtk_scrolled_window_unset_placement(). */ void gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window, GtkCornerType window_placement) { g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); gtk_scrolled_window_set_placement_internal (scrolled_window, window_placement); } /** * gtk_scrolled_window_get_placement: * @scrolled_window: a #GtkScrolledWindow * * Gets the placement of the contents with respect to the scrollbars * for the scrolled window. See gtk_scrolled_window_set_placement(). * * Returns: the current placement value. * * See also gtk_scrolled_window_set_placement() and * gtk_scrolled_window_unset_placement(). **/ GtkCornerType gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_CORNER_TOP_LEFT); return scrolled_window->priv->window_placement; } /** * gtk_scrolled_window_unset_placement: * @scrolled_window: a #GtkScrolledWindow * * Unsets the placement of the contents with respect to the scrollbars * for the scrolled window. If no window placement is set for a scrolled * window, it defaults to GTK_CORNER_TOP_LEFT. * * See also gtk_scrolled_window_set_placement() and * gtk_scrolled_window_get_placement(). * * Since: 2.10 **/ void gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window) { g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); gtk_scrolled_window_set_placement_internal (scrolled_window, GTK_CORNER_TOP_LEFT); } /** * gtk_scrolled_window_set_shadow_type: * @scrolled_window: a #GtkScrolledWindow * @type: kind of shadow to draw around scrolled window contents * * Changes the type of shadow drawn around the contents of * @scrolled_window. * **/ void gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window, GtkShadowType type) { GtkScrolledWindowPrivate *priv; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); g_return_if_fail (type >= GTK_SHADOW_NONE && type <= GTK_SHADOW_ETCHED_OUT); priv = scrolled_window->priv; if (priv->shadow_type != type) { priv->shadow_type = type; if (gtk_widget_is_drawable (GTK_WIDGET (scrolled_window))) gtk_widget_queue_draw (GTK_WIDGET (scrolled_window)); gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); g_object_notify (G_OBJECT (scrolled_window), "shadow-type"); } } /** * gtk_scrolled_window_get_shadow_type: * @scrolled_window: a #GtkScrolledWindow * * Gets the shadow type of the scrolled window. See * gtk_scrolled_window_set_shadow_type(). * * Returns: the current shadow type **/ GtkShadowType gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), GTK_SHADOW_NONE); return scrolled_window->priv->shadow_type; } /** * gtk_scrolled_window_set_kinetic_scrolling: * @scrolled_window: a #GtkScrolledWindow * @kinetic_scrolling: %TRUE to enable kinetic scrolling * * Turns kinetic scrolling on or off. * Kinetic scrolling only applies to devices with source * %GDK_SOURCE_TOUCHSCREEN. * * Since: 3.4 **/ void gtk_scrolled_window_set_kinetic_scrolling (GtkScrolledWindow *scrolled_window, gboolean kinetic_scrolling) { GtkPropagationPhase phase = GTK_PHASE_NONE; GtkScrolledWindowPrivate *priv; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); priv = scrolled_window->priv; if (priv->kinetic_scrolling == kinetic_scrolling) return; priv->kinetic_scrolling = kinetic_scrolling; gtk_scrolled_window_check_attach_pan_gesture (scrolled_window); if (priv->kinetic_scrolling) phase = GTK_PHASE_CAPTURE; else gtk_scrolled_window_cancel_deceleration (scrolled_window); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->drag_gesture), phase); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->swipe_gesture), phase); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->long_press_gesture), phase); gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->pan_gesture), phase); g_object_notify (G_OBJECT (scrolled_window), "kinetic-scrolling"); } /** * gtk_scrolled_window_get_kinetic_scrolling: * @scrolled_window: a #GtkScrolledWindow * * Returns the specified kinetic scrolling behavior. * * Returns: the scrolling behavior flags. * * Since: 3.4 */ gboolean gtk_scrolled_window_get_kinetic_scrolling (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), FALSE); return scrolled_window->priv->kinetic_scrolling; } /** * gtk_scrolled_window_set_capture_button_press: * @scrolled_window: a #GtkScrolledWindow * @capture_button_press: %TRUE to capture button presses * * Changes the behaviour of @scrolled_window wrt. to the initial * event that possibly starts kinetic scrolling. When @capture_button_press * is set to %TRUE, the event is captured by the scrolled window, and * then later replayed if it is meant to go to the child widget. * * This should be enabled if any child widgets perform non-reversible * actions on #GtkWidget::button-press-event. If they don't, and handle * additionally handle #GtkWidget::grab-broken-event, it might be better * to set @capture_button_press to %FALSE. * * This setting only has an effect if kinetic scrolling is enabled. * * Since: 3.4 */ void gtk_scrolled_window_set_capture_button_press (GtkScrolledWindow *scrolled_window, gboolean capture_button_press) { g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); scrolled_window->priv->capture_button_press = capture_button_press; } /** * gtk_scrolled_window_get_capture_button_press: * @scrolled_window: a #GtkScrolledWindow * * Return whether button presses are captured during kinetic * scrolling. See gtk_scrolled_window_set_capture_button_press(). * * Returns: %TRUE if button presses are captured during kinetic scrolling * * Since: 3.4 */ gboolean gtk_scrolled_window_get_capture_button_press (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), FALSE); return scrolled_window->priv->capture_button_press; } static void gtk_scrolled_window_destroy (GtkWidget *widget) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); GtkScrolledWindowPrivate *priv = scrolled_window->priv; if (priv->hscrollbar) { g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)), gtk_scrolled_window_adjustment_changed, scrolled_window); gtk_widget_unparent (priv->hscrollbar); gtk_widget_destroy (priv->hscrollbar); g_object_unref (priv->hscrollbar); priv->hscrollbar = NULL; } if (priv->vscrollbar) { g_signal_handlers_disconnect_by_func (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)), gtk_scrolled_window_adjustment_changed, scrolled_window); gtk_widget_unparent (priv->vscrollbar); gtk_widget_destroy (priv->vscrollbar); g_object_unref (priv->vscrollbar); priv->vscrollbar = NULL; } if (priv->deceleration_id) { gtk_widget_remove_tick_callback (widget, priv->deceleration_id); priv->deceleration_id = 0; } g_clear_object (&priv->drag_gesture); g_clear_object (&priv->swipe_gesture); g_clear_object (&priv->long_press_gesture); GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->destroy (widget); } static void gtk_scrolled_window_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object); GtkScrolledWindowPrivate *priv = scrolled_window->priv; switch (prop_id) { case PROP_HADJUSTMENT: gtk_scrolled_window_set_hadjustment (scrolled_window, g_value_get_object (value)); break; case PROP_VADJUSTMENT: gtk_scrolled_window_set_vadjustment (scrolled_window, g_value_get_object (value)); break; case PROP_HSCROLLBAR_POLICY: gtk_scrolled_window_set_policy (scrolled_window, g_value_get_enum (value), priv->vscrollbar_policy); break; case PROP_VSCROLLBAR_POLICY: gtk_scrolled_window_set_policy (scrolled_window, priv->hscrollbar_policy, g_value_get_enum (value)); break; case PROP_WINDOW_PLACEMENT: gtk_scrolled_window_set_placement_internal (scrolled_window, g_value_get_enum (value)); break; case PROP_WINDOW_PLACEMENT_SET: /* noop */ break; case PROP_SHADOW_TYPE: gtk_scrolled_window_set_shadow_type (scrolled_window, g_value_get_enum (value)); break; case PROP_MIN_CONTENT_WIDTH: gtk_scrolled_window_set_min_content_width (scrolled_window, g_value_get_int (value)); break; case PROP_MIN_CONTENT_HEIGHT: gtk_scrolled_window_set_min_content_height (scrolled_window, g_value_get_int (value)); break; case PROP_KINETIC_SCROLLING: gtk_scrolled_window_set_kinetic_scrolling (scrolled_window, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gtk_scrolled_window_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (object); GtkScrolledWindowPrivate *priv = scrolled_window->priv; switch (prop_id) { case PROP_HADJUSTMENT: g_value_set_object (value, G_OBJECT (gtk_scrolled_window_get_hadjustment (scrolled_window))); break; case PROP_VADJUSTMENT: g_value_set_object (value, G_OBJECT (gtk_scrolled_window_get_vadjustment (scrolled_window))); break; case PROP_WINDOW_PLACEMENT: g_value_set_enum (value, priv->window_placement); break; case PROP_WINDOW_PLACEMENT_SET: g_value_set_boolean (value, TRUE); break; case PROP_SHADOW_TYPE: g_value_set_enum (value, priv->shadow_type); break; case PROP_HSCROLLBAR_POLICY: g_value_set_enum (value, priv->hscrollbar_policy); break; case PROP_VSCROLLBAR_POLICY: g_value_set_enum (value, priv->vscrollbar_policy); break; case PROP_MIN_CONTENT_WIDTH: g_value_set_int (value, priv->min_content_width); break; case PROP_MIN_CONTENT_HEIGHT: g_value_set_int (value, priv->min_content_height); break; case PROP_KINETIC_SCROLLING: g_value_set_boolean (value, priv->kinetic_scrolling); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gtk_scrolled_window_draw_scrollbars_junction (GtkScrolledWindow *scrolled_window, cairo_t *cr) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkWidget *widget = GTK_WIDGET (scrolled_window); GtkAllocation wid_allocation, hscr_allocation, vscr_allocation; GtkStyleContext *context; GdkRectangle junction_rect; gboolean is_rtl, scrollbars_within_bevel; is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL; gtk_widget_get_allocation (widget, &wid_allocation); gtk_widget_get_allocation (GTK_WIDGET (priv->hscrollbar), &hscr_allocation); gtk_widget_get_allocation (GTK_WIDGET (priv->vscrollbar), &vscr_allocation); gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL); context = gtk_widget_get_style_context (widget); if (scrollbars_within_bevel && priv->shadow_type != GTK_SHADOW_NONE) { GtkStateFlags state; GtkBorder padding, border; state = gtk_widget_get_state_flags (widget); gtk_style_context_save (context); gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME); gtk_style_context_get_padding (context, state, &padding); gtk_style_context_get_border (context, state, &border); gtk_style_context_restore (context); junction_rect.x = padding.left + border.left; junction_rect.y = padding.top + border.top; } else { junction_rect.x = 0; junction_rect.y = 0; } junction_rect.width = vscr_allocation.width; junction_rect.height = hscr_allocation.height; if ((is_rtl && (priv->window_placement == GTK_CORNER_TOP_RIGHT || priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) || (!is_rtl && (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_BOTTOM_LEFT))) junction_rect.x += hscr_allocation.width; if (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_TOP_RIGHT) junction_rect.y += vscr_allocation.height; gtk_style_context_save (context); gtk_style_context_add_class (context, GTK_STYLE_CLASS_SCROLLBARS_JUNCTION); gtk_render_background (context, cr, junction_rect.x, junction_rect.y, junction_rect.width, junction_rect.height); gtk_render_frame (context, cr, junction_rect.x, junction_rect.y, junction_rect.width, junction_rect.height); gtk_style_context_restore (context); } static gboolean gtk_scrolled_window_draw (GtkWidget *widget, cairo_t *cr) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkAllocation relative_allocation; GtkStyleContext *context; context = gtk_widget_get_style_context (widget); gtk_scrolled_window_relative_allocation (widget, &relative_allocation); gtk_render_background (context, cr, 0, 0, gtk_widget_get_allocated_width (widget), gtk_widget_get_allocated_height (widget)); if (priv->hscrollbar_visible && priv->vscrollbar_visible) gtk_scrolled_window_draw_scrollbars_junction (scrolled_window, cr); if (priv->shadow_type != GTK_SHADOW_NONE) { gboolean scrollbars_within_bevel; gtk_style_context_save (context); gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME); gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL); if (!scrollbars_within_bevel) { GtkStateFlags state; GtkBorder padding, border; state = gtk_widget_get_state_flags (widget); gtk_style_context_get_padding (context, state, &padding); gtk_style_context_get_border (context, state, &border); relative_allocation.x -= padding.left + border.left; relative_allocation.y -= padding.top + border.top; relative_allocation.width += padding.left + padding.right + border.left + border.right; relative_allocation.height += padding.top + padding.bottom + border.top + border.bottom; } else { relative_allocation.x = 0; relative_allocation.y = 0; relative_allocation.width = gtk_widget_get_allocated_width (widget); relative_allocation.height = gtk_widget_get_allocated_height (widget); } gtk_render_frame (context, cr, relative_allocation.x, relative_allocation.y, relative_allocation.width, relative_allocation.height); gtk_style_context_restore (context); } GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->draw (widget, cr); return FALSE; } static void gtk_scrolled_window_forall (GtkContainer *container, gboolean include_internals, GtkCallback callback, gpointer callback_data) { GtkScrolledWindowPrivate *priv; GtkScrolledWindow *scrolled_window; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container)); g_return_if_fail (callback != NULL); GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->forall (container, include_internals, callback, callback_data); if (include_internals) { scrolled_window = GTK_SCROLLED_WINDOW (container); priv = scrolled_window->priv; if (priv->vscrollbar) callback (priv->vscrollbar, callback_data); if (priv->hscrollbar) callback (priv->hscrollbar, callback_data); } } static gboolean gtk_scrolled_window_scroll_child (GtkScrolledWindow *scrolled_window, GtkScrollType scroll, gboolean horizontal) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkAdjustment *adjustment = NULL; switch (scroll) { case GTK_SCROLL_STEP_UP: scroll = GTK_SCROLL_STEP_BACKWARD; horizontal = FALSE; break; case GTK_SCROLL_STEP_DOWN: scroll = GTK_SCROLL_STEP_FORWARD; horizontal = FALSE; break; case GTK_SCROLL_STEP_LEFT: scroll = GTK_SCROLL_STEP_BACKWARD; horizontal = TRUE; break; case GTK_SCROLL_STEP_RIGHT: scroll = GTK_SCROLL_STEP_FORWARD; horizontal = TRUE; break; case GTK_SCROLL_PAGE_UP: scroll = GTK_SCROLL_PAGE_BACKWARD; horizontal = FALSE; break; case GTK_SCROLL_PAGE_DOWN: scroll = GTK_SCROLL_PAGE_FORWARD; horizontal = FALSE; break; case GTK_SCROLL_PAGE_LEFT: scroll = GTK_SCROLL_STEP_BACKWARD; horizontal = TRUE; break; case GTK_SCROLL_PAGE_RIGHT: scroll = GTK_SCROLL_STEP_FORWARD; horizontal = TRUE; break; case GTK_SCROLL_STEP_BACKWARD: case GTK_SCROLL_STEP_FORWARD: case GTK_SCROLL_PAGE_BACKWARD: case GTK_SCROLL_PAGE_FORWARD: case GTK_SCROLL_START: case GTK_SCROLL_END: break; default: g_warning ("Invalid scroll type %u for GtkScrolledWindow::scroll-child", scroll); return FALSE; } if ((horizontal && !priv->hscrollbar_visible) || (!horizontal && !priv->vscrollbar_visible)) return FALSE; if (horizontal) { adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); } else { adjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); } if (adjustment) { gdouble value = gtk_adjustment_get_value (adjustment); switch (scroll) { case GTK_SCROLL_STEP_FORWARD: value += gtk_adjustment_get_step_increment (adjustment); break; case GTK_SCROLL_STEP_BACKWARD: value -= gtk_adjustment_get_step_increment (adjustment); break; case GTK_SCROLL_PAGE_FORWARD: value += gtk_adjustment_get_page_increment (adjustment); break; case GTK_SCROLL_PAGE_BACKWARD: value -= gtk_adjustment_get_page_increment (adjustment); break; case GTK_SCROLL_START: value = gtk_adjustment_get_lower (adjustment); break; case GTK_SCROLL_END: value = gtk_adjustment_get_upper (adjustment); break; default: g_assert_not_reached (); break; } gtk_adjustment_set_value (adjustment, value); return TRUE; } return FALSE; } static void gtk_scrolled_window_move_focus_out (GtkScrolledWindow *scrolled_window, GtkDirectionType direction_type) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkWidget *toplevel; /* Focus out of the scrolled window entirely. We do this by setting * a flag, then propagating the focus motion to the notebook. */ toplevel = gtk_widget_get_toplevel (GTK_WIDGET (scrolled_window)); if (!gtk_widget_is_toplevel (toplevel)) return; g_object_ref (scrolled_window); priv->focus_out = TRUE; g_signal_emit_by_name (toplevel, "move-focus", direction_type); priv->focus_out = FALSE; g_object_unref (scrolled_window); } static void gtk_scrolled_window_relative_allocation (GtkWidget *widget, GtkAllocation *allocation) { GtkAllocation widget_allocation; GtkScrolledWindow *scrolled_window; GtkScrolledWindowPrivate *priv; gint sb_spacing; gint sb_width; gint sb_height; g_return_if_fail (widget != NULL); g_return_if_fail (allocation != NULL); scrolled_window = GTK_SCROLLED_WINDOW (widget); priv = scrolled_window->priv; /* Get possible scrollbar dimensions */ sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window); gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL); gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL); gtk_widget_get_allocation (widget, &widget_allocation); allocation->x = 0; allocation->y = 0; allocation->width = widget_allocation.width; allocation->height = widget_allocation.height; /* Subtract some things from our available allocation size */ if (priv->shadow_type != GTK_SHADOW_NONE) { GtkStyleContext *context; GtkStateFlags state; GtkBorder padding, border; context = gtk_widget_get_style_context (widget); state = gtk_widget_get_state_flags (widget); gtk_style_context_save (context); gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME); gtk_style_context_get_border (context, state, &border); gtk_style_context_get_padding (context, state, &padding); allocation->x += padding.left + border.left; allocation->y += padding.top + border.top; allocation->width = MAX (1, allocation->width - (padding.left + border.left + padding.right + border.right)); allocation->height = MAX (1, allocation->height - (padding.top + border.top + padding.bottom + border.bottom)); gtk_style_context_restore (context); } if (priv->vscrollbar_visible) { gboolean is_rtl; is_rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL; if ((!is_rtl && (priv->window_placement == GTK_CORNER_TOP_RIGHT || priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) || (is_rtl && (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_BOTTOM_LEFT))) allocation->x += (sb_width + sb_spacing); allocation->width = MAX (1, allocation->width - (sb_width + sb_spacing)); } if (priv->hscrollbar_visible) { if (priv->window_placement == GTK_CORNER_BOTTOM_LEFT || priv->window_placement == GTK_CORNER_BOTTOM_RIGHT) allocation->y += (sb_height + sb_spacing); allocation->height = MAX (1, allocation->height - (sb_height + sb_spacing)); } } static gboolean _gtk_scrolled_window_get_overshoot (GtkScrolledWindow *scrolled_window, gint *overshoot_x, gint *overshoot_y) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkAdjustment *vadjustment, *hadjustment; gdouble lower, upper, x, y; /* Vertical overshoot */ vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); lower = gtk_adjustment_get_lower (vadjustment); upper = gtk_adjustment_get_upper (vadjustment) - gtk_adjustment_get_page_size (vadjustment); if (priv->unclamped_vadj_value < lower) y = priv->unclamped_vadj_value - lower; else if (priv->unclamped_vadj_value > upper) y = priv->unclamped_vadj_value - upper; else y = 0; /* Horizontal overshoot */ hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); lower = gtk_adjustment_get_lower (hadjustment); upper = gtk_adjustment_get_upper (hadjustment) - gtk_adjustment_get_page_size (hadjustment); if (priv->unclamped_hadj_value < lower) x = priv->unclamped_hadj_value - lower; else if (priv->unclamped_hadj_value > upper) x = priv->unclamped_hadj_value - upper; else x = 0; if (overshoot_x) *overshoot_x = x; if (overshoot_y) *overshoot_y = y; return (x != 0 || y != 0); } static void _gtk_scrolled_window_allocate_overshoot_window (GtkScrolledWindow *scrolled_window) { GtkAllocation window_allocation, relative_allocation, allocation; GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkWidget *widget = GTK_WIDGET (scrolled_window); gint overshoot_x, overshoot_y; if (!gtk_widget_get_realized (widget)) return; gtk_widget_get_allocation (widget, &allocation); gtk_scrolled_window_relative_allocation (widget, &relative_allocation); _gtk_scrolled_window_get_overshoot (scrolled_window, &overshoot_x, &overshoot_y); window_allocation = relative_allocation; window_allocation.x += allocation.x; window_allocation.y += allocation.y; /* Handle displacement to the left/top by moving the overshoot * window, overshooting to the bottom/right is handled in * gtk_scrolled_window_allocate_child() */ if (overshoot_x < 0) window_allocation.x += -overshoot_x; if (overshoot_y < 0) window_allocation.y += -overshoot_y; window_allocation.width -= ABS (overshoot_x); window_allocation.height -= ABS (overshoot_y); gdk_window_move_resize (priv->overshoot_window, window_allocation.x, window_allocation.y, window_allocation.width, window_allocation.height); } static void gtk_scrolled_window_allocate_child (GtkScrolledWindow *swindow, GtkAllocation *relative_allocation) { GtkWidget *widget = GTK_WIDGET (swindow), *child; GtkAllocation allocation; GtkAllocation child_allocation; gint overshoot_x, overshoot_y; child = gtk_bin_get_child (GTK_BIN (widget)); gtk_widget_get_allocation (widget, &allocation); gtk_scrolled_window_relative_allocation (widget, relative_allocation); _gtk_scrolled_window_get_overshoot (swindow, &overshoot_x, &overshoot_y); /* Handle overshooting to the right/bottom by relocating the * widget allocation to negative coordinates, so these edges * stick to the overshoot window border. */ if (overshoot_x > 0) child_allocation.x = -overshoot_x; else child_allocation.x = 0; if (overshoot_y > 0) child_allocation.y = -overshoot_y; else child_allocation.y = 0; child_allocation.width = relative_allocation->width; child_allocation.height = relative_allocation->height; gtk_widget_size_allocate (child, &child_allocation); } static void gtk_scrolled_window_size_allocate (GtkWidget *widget, GtkAllocation *allocation) { GtkScrolledWindow *scrolled_window; GtkScrolledWindowPrivate *priv; GtkStyleContext *context; GtkStateFlags state; GtkBorder padding, border; GtkBin *bin; GtkAllocation relative_allocation; GtkAllocation child_allocation; GtkWidget *child; gboolean scrollbars_within_bevel; gint sb_spacing; gint sb_width; gint sb_height; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget)); g_return_if_fail (allocation != NULL); scrolled_window = GTK_SCROLLED_WINDOW (widget); bin = GTK_BIN (scrolled_window); priv = scrolled_window->priv; /* Get possible scrollbar dimensions */ sb_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window); gtk_widget_get_preferred_height (priv->hscrollbar, &sb_height, NULL); gtk_widget_get_preferred_width (priv->vscrollbar, &sb_width, NULL); context = gtk_widget_get_style_context (widget); state = gtk_widget_get_state_flags (widget); gtk_style_context_save (context); gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME); gtk_style_context_get_padding (context, state, &padding); gtk_style_context_get_border (context, state, &border); gtk_widget_style_get (widget, "scrollbars-within-bevel", &scrollbars_within_bevel, NULL); gtk_widget_set_allocation (widget, allocation); gtk_style_context_restore (context); if (priv->hscrollbar_policy == GTK_POLICY_ALWAYS) priv->hscrollbar_visible = TRUE; else if (priv->hscrollbar_policy == GTK_POLICY_NEVER) priv->hscrollbar_visible = FALSE; if (priv->vscrollbar_policy == GTK_POLICY_ALWAYS) priv->vscrollbar_visible = TRUE; else if (priv->vscrollbar_policy == GTK_POLICY_NEVER) priv->vscrollbar_visible = FALSE; child = gtk_bin_get_child (bin); if (child && gtk_widget_get_visible (child)) { gint child_scroll_width; gint child_scroll_height; GtkScrollablePolicy hscroll_policy; GtkScrollablePolicy vscroll_policy; gboolean previous_hvis; gboolean previous_vvis; guint count = 0; hscroll_policy = GTK_IS_SCROLLABLE (child) ? gtk_scrollable_get_hscroll_policy (GTK_SCROLLABLE (child)) : GTK_SCROLL_MINIMUM; vscroll_policy = GTK_IS_SCROLLABLE (child) ? gtk_scrollable_get_vscroll_policy (GTK_SCROLLABLE (child)) : GTK_SCROLL_MINIMUM; /* Determine scrollbar visibility first via hfw apis */ if (gtk_widget_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH) { if (hscroll_policy == GTK_SCROLL_MINIMUM) gtk_widget_get_preferred_width (child, &child_scroll_width, NULL); else gtk_widget_get_preferred_width (child, NULL, &child_scroll_width); if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC) { /* First try without a vertical scrollbar if the content will fit the height * given the extra width of the scrollbar */ if (vscroll_policy == GTK_SCROLL_MINIMUM) gtk_widget_get_preferred_height_for_width (child, MAX (allocation->width, child_scroll_width), &child_scroll_height, NULL); else gtk_widget_get_preferred_height_for_width (child, MAX (allocation->width, child_scroll_width), NULL, &child_scroll_height); if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC) { /* Does the content height fit the allocation height ? */ priv->vscrollbar_visible = child_scroll_height > allocation->height; /* Does the content width fit the allocation with minus a possible scrollbar ? */ priv->hscrollbar_visible = child_scroll_width > allocation->width - (priv->vscrollbar_visible ? sb_width + sb_spacing : 0); /* Now that we've guessed the hscrollbar, does the content height fit * the possible new allocation height ? */ priv->vscrollbar_visible = child_scroll_height > allocation->height - (priv->hscrollbar_visible ? sb_height + sb_spacing : 0); /* Now that we've guessed the vscrollbar, does the content width fit * the possible new allocation width ? */ priv->hscrollbar_visible = child_scroll_width > allocation->width - (priv->vscrollbar_visible ? sb_width + sb_spacing : 0); } else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */ { priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER; priv->vscrollbar_visible = child_scroll_height > allocation->height - (priv->hscrollbar_visible ? sb_height + sb_spacing : 0); } } else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */ { priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER; if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC) priv->hscrollbar_visible = child_scroll_width > allocation->width - (priv->vscrollbar_visible ? 0 : sb_width + sb_spacing); else priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER; } } else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT */ { if (vscroll_policy == GTK_SCROLL_MINIMUM) gtk_widget_get_preferred_height (child, &child_scroll_height, NULL); else gtk_widget_get_preferred_height (child, NULL, &child_scroll_height); if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC) { /* First try without a horizontal scrollbar if the content will fit the width * given the extra height of the scrollbar */ if (hscroll_policy == GTK_SCROLL_MINIMUM) gtk_widget_get_preferred_width_for_height (child, MAX (allocation->height, child_scroll_height), &child_scroll_width, NULL); else gtk_widget_get_preferred_width_for_height (child, MAX (allocation->height, child_scroll_height), NULL, &child_scroll_width); if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC) { /* Does the content width fit the allocation width ? */ priv->hscrollbar_visible = child_scroll_width > allocation->width; /* Does the content height fit the allocation with minus a possible scrollbar ? */ priv->vscrollbar_visible = child_scroll_height > allocation->height - (priv->hscrollbar_visible ? sb_height + sb_spacing : 0); /* Now that we've guessed the vscrollbar, does the content width fit * the possible new allocation width ? */ priv->hscrollbar_visible = child_scroll_width > allocation->width - (priv->vscrollbar_visible ? sb_width + sb_spacing : 0); /* Now that we've guessed the hscrollbar, does the content height fit * the possible new allocation height ? */ priv->vscrollbar_visible = child_scroll_height > allocation->height - (priv->hscrollbar_visible ? sb_height + sb_spacing : 0); } else /* priv->vscrollbar_policy != GTK_POLICY_AUTOMATIC */ { priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER; priv->hscrollbar_visible = child_scroll_width > allocation->width - (priv->vscrollbar_visible ? sb_width + sb_spacing : 0); } } else /* priv->hscrollbar_policy != GTK_POLICY_AUTOMATIC */ { priv->hscrollbar_visible = priv->hscrollbar_policy != GTK_POLICY_NEVER; if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC) priv->vscrollbar_visible = child_scroll_height > allocation->height - (priv->hscrollbar_visible ? 0 : sb_height + sb_spacing); else priv->vscrollbar_visible = priv->vscrollbar_policy != GTK_POLICY_NEVER; } } /* Now after guessing scrollbar visibility; fall back on the allocation loop which * observes the adjustments to detect scrollbar visibility and also avoids * infinite recursion */ do { previous_hvis = priv->hscrollbar_visible; previous_vvis = priv->vscrollbar_visible; gtk_scrolled_window_allocate_child (scrolled_window, &relative_allocation); /* Explicitly force scrollbar visibility checks. * * Since we make a guess above, the child might not decide to update the adjustments * if they logically did not change since the last configuration */ if (priv->hscrollbar) gtk_scrolled_window_adjustment_changed (gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)), scrolled_window); if (priv->vscrollbar) gtk_scrolled_window_adjustment_changed (gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)), scrolled_window); /* If, after the first iteration, the hscrollbar and the * vscrollbar flip visiblity... or if one of the scrollbars flip * on each itteration indefinitly/infinitely, then we just need both * at this size. */ if ((count && previous_hvis != priv->hscrollbar_visible && previous_vvis != priv->vscrollbar_visible) || count > 3) { priv->hscrollbar_visible = TRUE; priv->vscrollbar_visible = TRUE; gtk_scrolled_window_allocate_child (scrolled_window, &relative_allocation); break; } count++; } while (previous_hvis != priv->hscrollbar_visible || previous_vvis != priv->vscrollbar_visible); } else { priv->hscrollbar_visible = priv->hscrollbar_policy == GTK_POLICY_ALWAYS; priv->vscrollbar_visible = priv->vscrollbar_policy == GTK_POLICY_ALWAYS; gtk_scrolled_window_relative_allocation (widget, &relative_allocation); } gtk_widget_set_child_visible (priv->hscrollbar, priv->hscrollbar_visible); if (priv->hscrollbar_visible) { child_allocation.x = relative_allocation.x; if (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_TOP_RIGHT) child_allocation.y = (relative_allocation.y + relative_allocation.height + sb_spacing); else child_allocation.y = relative_allocation.y - sb_spacing - sb_height; child_allocation.width = relative_allocation.width; child_allocation.height = sb_height; child_allocation.x += allocation->x; child_allocation.y += allocation->y; if (priv->shadow_type != GTK_SHADOW_NONE) { if (!scrollbars_within_bevel) { child_allocation.x -= padding.left + border.left; child_allocation.width += padding.left + padding.right + border.left + border.right; if (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_TOP_RIGHT) child_allocation.y += padding.bottom + border.bottom; else child_allocation.y -= padding.top + border.top; } } gtk_widget_size_allocate (priv->hscrollbar, &child_allocation); } gtk_widget_set_child_visible (priv->vscrollbar, priv->vscrollbar_visible); if (priv->vscrollbar_visible) { if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL && (priv->window_placement == GTK_CORNER_TOP_RIGHT || priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) || (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR && (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_BOTTOM_LEFT))) child_allocation.x = (relative_allocation.x + relative_allocation.width + sb_spacing); else child_allocation.x = relative_allocation.x - sb_spacing - sb_width; child_allocation.y = relative_allocation.y; child_allocation.width = sb_width; child_allocation.height = relative_allocation.height; child_allocation.x += allocation->x; child_allocation.y += allocation->y; if (priv->shadow_type != GTK_SHADOW_NONE) { if (!scrollbars_within_bevel) { child_allocation.y -= padding.top + border.top; child_allocation.height += padding.top + padding.bottom + border.top + border.bottom; if ((gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL && (priv->window_placement == GTK_CORNER_TOP_RIGHT || priv->window_placement == GTK_CORNER_BOTTOM_RIGHT)) || (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR && (priv->window_placement == GTK_CORNER_TOP_LEFT || priv->window_placement == GTK_CORNER_BOTTOM_LEFT))) child_allocation.x += padding.right + border.right; else child_allocation.x -= padding.left + border.left; } } gtk_widget_size_allocate (priv->vscrollbar, &child_allocation); } _gtk_scrolled_window_allocate_overshoot_window (scrolled_window); gtk_scrolled_window_check_attach_pan_gesture (scrolled_window); } static gboolean gtk_scrolled_window_scroll_event (GtkWidget *widget, GdkEventScroll *event) { GtkScrolledWindowPrivate *priv; GtkScrolledWindow *scrolled_window; gboolean handled = FALSE; gdouble delta_x; gdouble delta_y; gdouble delta; g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (widget), FALSE); g_return_val_if_fail (event != NULL, FALSE); scrolled_window = GTK_SCROLLED_WINDOW (widget); priv = scrolled_window->priv; if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &delta_x, &delta_y)) { if (delta_x != 0.0 && gtk_widget_get_visible (priv->hscrollbar)) { GtkAdjustment *adj; gdouble new_value; gdouble page_size; gdouble scroll_unit; adj = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); page_size = gtk_adjustment_get_page_size (adj); scroll_unit = pow (page_size, 2.0 / 3.0); new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_x * scroll_unit, gtk_adjustment_get_lower (adj), gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj)); gtk_adjustment_set_value (adj, new_value); handled = TRUE; } if (delta_y != 0.0 && gtk_widget_get_visible (priv->vscrollbar)) { GtkAdjustment *adj; gdouble new_value; gdouble page_size; gdouble scroll_unit; adj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); page_size = gtk_adjustment_get_page_size (adj); scroll_unit = pow (page_size, 2.0 / 3.0); new_value = CLAMP (gtk_adjustment_get_value (adj) + delta_y * scroll_unit, gtk_adjustment_get_lower (adj), gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj)); gtk_adjustment_set_value (adj, new_value); handled = TRUE; } } else { GtkWidget *range; if (event->direction == GDK_SCROLL_UP || event->direction == GDK_SCROLL_DOWN) range = priv->vscrollbar; else range = priv->hscrollbar; if (range && gtk_widget_get_visible (range)) { GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (range)); gdouble new_value; delta = _gtk_range_get_wheel_delta (GTK_RANGE (range), event); new_value = CLAMP (gtk_adjustment_get_value (adj) + delta, gtk_adjustment_get_lower (adj), gtk_adjustment_get_upper (adj) - gtk_adjustment_get_page_size (adj)); gtk_adjustment_set_value (adj, new_value); handled = TRUE; } } return handled; } static gboolean _gtk_scrolled_window_set_adjustment_value (GtkScrolledWindow *scrolled_window, GtkAdjustment *adjustment, gdouble value, gboolean allow_overshooting, gboolean snap_to_border) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; gdouble lower, upper, *prev_value; lower = gtk_adjustment_get_lower (adjustment); upper = gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_page_size (adjustment); if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar))) prev_value = &priv->unclamped_hadj_value; else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar))) prev_value = &priv->unclamped_vadj_value; else return FALSE; if (snap_to_border) { if (*prev_value < 0 && value > 0) value = 0; else if (*prev_value > upper && value < upper) value = upper; } if (allow_overshooting) { lower -= MAX_OVERSHOOT_DISTANCE; upper += MAX_OVERSHOOT_DISTANCE; } *prev_value = CLAMP (value, lower, upper); gtk_adjustment_set_value (adjustment, value); return (*prev_value != value); } static gboolean scrolled_window_deceleration_cb (GtkWidget *widget, GdkFrameClock *frame_clock, gpointer user_data) { KineticScrollData *data = user_data; GtkScrolledWindow *scrolled_window = data->scrolled_window; GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkAdjustment *hadjustment, *vadjustment; gint old_overshoot_x, old_overshoot_y, overshoot_x, overshoot_y; gint64 current_time; gdouble position, elapsed; current_time = gdk_frame_clock_get_frame_time (frame_clock); elapsed = (current_time - data->last_deceleration_time) / 1000000.0; data->last_deceleration_time = current_time; hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); _gtk_scrolled_window_get_overshoot (scrolled_window, &old_overshoot_x, &old_overshoot_y); if (data->hscrolling && gtk_kinetic_scrolling_tick (data->hscrolling, elapsed, &position)) { priv->unclamped_hadj_value = position; gtk_adjustment_set_value (hadjustment, position); } else if (data->hscrolling) g_clear_pointer (&data->hscrolling, (GDestroyNotify) gtk_kinetic_scrolling_free); if (data->vscrolling && gtk_kinetic_scrolling_tick (data->vscrolling, elapsed, &position)) { priv->unclamped_vadj_value = position; gtk_adjustment_set_value (vadjustment, position); } else if (data->vscrolling) g_clear_pointer (&data->vscrolling, (GDestroyNotify) gtk_kinetic_scrolling_free); _gtk_scrolled_window_get_overshoot (scrolled_window, &overshoot_x, &overshoot_y); if (old_overshoot_x != overshoot_x || old_overshoot_y != overshoot_y) { if (overshoot_x >= 0 || overshoot_y >= 0) { /* We need to reallocate the widget to have it at * negative offset, so there's a "gravity" on the * bottom/right corner */ gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); } else if (overshoot_x < 0 || overshoot_y < 0) { _gtk_scrolled_window_allocate_overshoot_window (scrolled_window); } } if (!data->hscrolling && !data->vscrolling) { gtk_scrolled_window_cancel_deceleration (scrolled_window); return G_SOURCE_REMOVE; } return G_SOURCE_CONTINUE; } static void gtk_scrolled_window_cancel_deceleration (GtkScrolledWindow *scrolled_window) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; if (priv->deceleration_id) { gtk_widget_remove_tick_callback (GTK_WIDGET (scrolled_window), priv->deceleration_id); priv->deceleration_id = 0; } } static void kinetic_scroll_data_free (KineticScrollData *data) { if (data->hscrolling) gtk_kinetic_scrolling_free (data->hscrolling); if (data->vscrolling) gtk_kinetic_scrolling_free (data->vscrolling); g_free (data); } static void gtk_scrolled_window_start_deceleration (GtkScrolledWindow *scrolled_window) { GtkScrolledWindowPrivate *priv = scrolled_window->priv; GdkFrameClock *frame_clock; KineticScrollData *data; g_return_if_fail (priv->deceleration_id == 0); frame_clock = gtk_widget_get_frame_clock (GTK_WIDGET (scrolled_window)); data = g_new0 (KineticScrollData, 1); data->scrolled_window = scrolled_window; data->last_deceleration_time = gdk_frame_clock_get_frame_time (frame_clock); if (priv->hscrollbar_visible) { gdouble lower,upper; GtkAdjustment *hadjustment; hadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); lower = gtk_adjustment_get_lower (hadjustment); upper = gtk_adjustment_get_upper (hadjustment); upper -= gtk_adjustment_get_page_size (hadjustment); data->hscrolling = gtk_kinetic_scrolling_new (lower, upper, MAX_OVERSHOOT_DISTANCE, DECELERATION_FRICTION, OVERSHOOT_FRICTION, priv->unclamped_hadj_value, priv->x_velocity); } if (priv->vscrollbar_visible) { gdouble lower,upper; GtkAdjustment *vadjustment; vadjustment = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); lower = gtk_adjustment_get_lower(vadjustment); upper = gtk_adjustment_get_upper(vadjustment); upper -= gtk_adjustment_get_page_size(vadjustment); data->vscrolling = gtk_kinetic_scrolling_new (lower, upper, MAX_OVERSHOOT_DISTANCE, DECELERATION_FRICTION, OVERSHOOT_FRICTION, priv->unclamped_vadj_value, priv->y_velocity); } scrolled_window->priv->deceleration_id = gtk_widget_add_tick_callback (GTK_WIDGET (scrolled_window), scrolled_window_deceleration_cb, data, (GDestroyNotify) kinetic_scroll_data_free); } static gboolean gtk_scrolled_window_focus (GtkWidget *widget, GtkDirectionType direction) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkWidget *child; gboolean had_focus_child; had_focus_child = gtk_container_get_focus_child (GTK_CONTAINER (widget)) != NULL; if (priv->focus_out) { priv->focus_out = FALSE; /* Clear this to catch the wrap-around case */ return FALSE; } if (gtk_widget_is_focus (widget)) return FALSE; /* We only put the scrolled window itself in the focus chain if it * isn't possible to focus any children. */ child = gtk_bin_get_child (GTK_BIN (widget)); if (child) { if (gtk_widget_child_focus (child, direction)) return TRUE; } if (!had_focus_child && gtk_widget_get_can_focus (widget)) { gtk_widget_grab_focus (widget); return TRUE; } else return FALSE; } static void gtk_scrolled_window_adjustment_changed (GtkAdjustment *adjustment, gpointer data) { GtkScrolledWindowPrivate *priv; GtkScrolledWindow *scrolled_window; g_return_if_fail (adjustment != NULL); g_return_if_fail (data != NULL); scrolled_window = GTK_SCROLLED_WINDOW (data); priv = scrolled_window->priv; if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar))) { if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC) { gboolean visible; visible = priv->hscrollbar_visible; priv->hscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) > gtk_adjustment_get_page_size (adjustment)); if (priv->hscrollbar_visible != visible) gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); } } else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar))) { if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC) { gboolean visible; visible = priv->vscrollbar_visible; priv->vscrollbar_visible = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment) > gtk_adjustment_get_page_size (adjustment)); if (priv->vscrollbar_visible != visible) gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); } } } static void gtk_scrolled_window_adjustment_value_changed (GtkAdjustment *adjustment, gpointer user_data) { GtkScrolledWindow *scrolled_window = user_data; GtkScrolledWindowPrivate *priv = scrolled_window->priv; /* Allow overshooting for kinetic scrolling operations */ if (priv->drag_device || priv->deceleration_id) return; /* Ensure GtkAdjustment and unclamped values are in sync */ if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar))) priv->unclamped_hadj_value = gtk_adjustment_get_value (adjustment); else if (adjustment == gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar))) priv->unclamped_vadj_value = gtk_adjustment_get_value (adjustment); } static void gtk_scrolled_window_add (GtkContainer *container, GtkWidget *child) { GtkScrolledWindowPrivate *priv; GtkScrolledWindow *scrolled_window; GtkBin *bin; GtkWidget *child_widget, *scrollable_child; GtkAdjustment *hadj, *vadj; bin = GTK_BIN (container); child_widget = gtk_bin_get_child (bin); g_return_if_fail (child_widget == NULL); scrolled_window = GTK_SCROLLED_WINDOW (container); priv = scrolled_window->priv; /* gtk_scrolled_window_set_[hv]adjustment have the side-effect * of creating the scrollbars */ if (!priv->hscrollbar) gtk_scrolled_window_set_hadjustment (scrolled_window, NULL); if (!priv->vscrollbar) gtk_scrolled_window_set_vadjustment (scrolled_window, NULL); hadj = gtk_range_get_adjustment (GTK_RANGE (priv->hscrollbar)); vadj = gtk_range_get_adjustment (GTK_RANGE (priv->vscrollbar)); if (GTK_IS_SCROLLABLE (child)) { scrollable_child = child; } else { scrollable_child = gtk_viewport_new (hadj, vadj); gtk_widget_show (scrollable_child); gtk_container_set_focus_hadjustment (GTK_CONTAINER (scrollable_child), gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (scrolled_window))); gtk_container_set_focus_vadjustment (GTK_CONTAINER (scrollable_child), gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (scrolled_window))); gtk_container_add (GTK_CONTAINER (scrollable_child), child); } if (gtk_widget_get_realized (GTK_WIDGET (bin))) gtk_widget_set_parent_window (scrollable_child, priv->overshoot_window); _gtk_bin_set_child (bin, scrollable_child); gtk_widget_set_parent (scrollable_child, GTK_WIDGET (bin)); g_object_set (scrollable_child, "hadjustment", hadj, "vadjustment", vadj, NULL); } static void gtk_scrolled_window_remove (GtkContainer *container, GtkWidget *child) { g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container)); g_return_if_fail (child != NULL); g_return_if_fail (gtk_bin_get_child (GTK_BIN (container)) == child); g_object_set (child, "hadjustment", NULL, "vadjustment", NULL, NULL); /* chain parent class handler to remove child */ GTK_CONTAINER_CLASS (gtk_scrolled_window_parent_class)->remove (container, child); } /** * gtk_scrolled_window_add_with_viewport: * @scrolled_window: a #GtkScrolledWindow * @child: the widget you want to scroll * * Used to add children without native scrolling capabilities. This * is simply a convenience function; it is equivalent to adding the * unscrollable child to a viewport, then adding the viewport to the * scrolled window. If a child has native scrolling, use * gtk_container_add() instead of this function. * * The viewport scrolls the child by moving its #GdkWindow, and takes * the size of the child to be the size of its toplevel #GdkWindow. * This will be very wrong for most widgets that support native scrolling; * for example, if you add a widget such as #GtkTreeView with a viewport, * the whole widget will scroll, including the column headings. Thus, * widgets with native scrolling support should not be used with the * #GtkViewport proxy. * * A widget supports scrolling natively if it implements the * #GtkScrollable interface. * * Deprecated: 3.8: gtk_container_add() will now automatically add * a #GtkViewport if the child doesn’t implement #GtkScrollable. */ void gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window, GtkWidget *child) { GtkBin *bin; GtkWidget *viewport; GtkWidget *child_widget; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); g_return_if_fail (GTK_IS_WIDGET (child)); g_return_if_fail (gtk_widget_get_parent (child) == NULL); bin = GTK_BIN (scrolled_window); child_widget = gtk_bin_get_child (bin); if (child_widget) { g_return_if_fail (GTK_IS_VIEWPORT (child_widget)); g_return_if_fail (gtk_bin_get_child (GTK_BIN (child_widget)) == NULL); viewport = child_widget; } else { viewport = gtk_viewport_new (gtk_scrolled_window_get_hadjustment (scrolled_window), gtk_scrolled_window_get_vadjustment (scrolled_window)); gtk_container_set_focus_hadjustment (GTK_CONTAINER (viewport), gtk_scrolled_window_get_hadjustment (GTK_SCROLLED_WINDOW (scrolled_window))); gtk_container_set_focus_vadjustment (GTK_CONTAINER (viewport), gtk_scrolled_window_get_vadjustment (GTK_SCROLLED_WINDOW (scrolled_window))); gtk_container_add (GTK_CONTAINER (scrolled_window), viewport); } gtk_widget_show (viewport); gtk_container_add (GTK_CONTAINER (viewport), child); } /* * _gtk_scrolled_window_get_spacing: * @scrolled_window: a scrolled window * * Gets the spacing between the scrolled window’s scrollbars and * the scrolled widget. Used by GtkCombo * * Returns: the spacing, in pixels. */ gint _gtk_scrolled_window_get_scrollbar_spacing (GtkScrolledWindow *scrolled_window) { GtkScrolledWindowClass *class; g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0); class = GTK_SCROLLED_WINDOW_GET_CLASS (scrolled_window); if (class->scrollbar_spacing >= 0) return class->scrollbar_spacing; else { gint scrollbar_spacing; gtk_widget_style_get (GTK_WIDGET (scrolled_window), "scrollbar-spacing", &scrollbar_spacing, NULL); return scrollbar_spacing; } } static void gtk_scrolled_window_get_preferred_size (GtkWidget *widget, GtkOrientation orientation, gint *minimum_size, gint *natural_size) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); GtkScrolledWindowPrivate *priv = scrolled_window->priv; GtkBin *bin = GTK_BIN (scrolled_window); gint extra_width; gint extra_height; gint scrollbar_spacing; GtkRequisition hscrollbar_requisition; GtkRequisition vscrollbar_requisition; GtkRequisition minimum_req, natural_req; GtkWidget *child; gint min_child_size, nat_child_size; scrollbar_spacing = _gtk_scrolled_window_get_scrollbar_spacing (scrolled_window); extra_width = 0; extra_height = 0; minimum_req.width = 0; minimum_req.height = 0; natural_req.width = 0; natural_req.height = 0; gtk_widget_get_preferred_size (priv->hscrollbar, &hscrollbar_requisition, NULL); gtk_widget_get_preferred_size (priv->vscrollbar, &vscrollbar_requisition, NULL); child = gtk_bin_get_child (bin); if (child && gtk_widget_get_visible (child)) { if (orientation == GTK_ORIENTATION_HORIZONTAL) { gtk_widget_get_preferred_width (child, &min_child_size, &nat_child_size); if (priv->hscrollbar_policy == GTK_POLICY_NEVER) { minimum_req.width += min_child_size; natural_req.width += nat_child_size; } else { gint min_content_width = priv->min_content_width; if (min_content_width >= 0) { minimum_req.width = MAX (minimum_req.width, min_content_width); natural_req.width = MAX (natural_req.width, min_content_width); extra_width = -1; } else { minimum_req.width += vscrollbar_requisition.width; natural_req.width += vscrollbar_requisition.width; } } } else /* GTK_ORIENTATION_VERTICAL */ { gtk_widget_get_preferred_height (child, &min_child_size, &nat_child_size); if (priv->vscrollbar_policy == GTK_POLICY_NEVER) { minimum_req.height += min_child_size; natural_req.height += nat_child_size; } else { gint min_content_height = priv->min_content_height; if (min_content_height >= 0) { minimum_req.height = MAX (minimum_req.height, min_content_height); natural_req.height = MAX (natural_req.height, min_content_height); extra_height = -1; } else { minimum_req.height += vscrollbar_requisition.height; natural_req.height += vscrollbar_requisition.height; } } } } if (priv->hscrollbar_policy == GTK_POLICY_AUTOMATIC || priv->hscrollbar_policy == GTK_POLICY_ALWAYS) { minimum_req.width = MAX (minimum_req.width, hscrollbar_requisition.width); natural_req.width = MAX (natural_req.width, hscrollbar_requisition.width); if (!extra_height || priv->hscrollbar_policy == GTK_POLICY_ALWAYS) extra_height = scrollbar_spacing + hscrollbar_requisition.height; } if (priv->vscrollbar_policy == GTK_POLICY_AUTOMATIC || priv->vscrollbar_policy == GTK_POLICY_ALWAYS) { minimum_req.height = MAX (minimum_req.height, vscrollbar_requisition.height); natural_req.height = MAX (natural_req.height, vscrollbar_requisition.height); if (!extra_width || priv->vscrollbar_policy == GTK_POLICY_ALWAYS) extra_width = scrollbar_spacing + vscrollbar_requisition.width; } minimum_req.width += MAX (0, extra_width); minimum_req.height += MAX (0, extra_height); natural_req.width += MAX (0, extra_width); natural_req.height += MAX (0, extra_height); if (priv->shadow_type != GTK_SHADOW_NONE) { GtkStyleContext *context; GtkStateFlags state; GtkBorder padding, border; context = gtk_widget_get_style_context (GTK_WIDGET (widget)); state = gtk_widget_get_state_flags (GTK_WIDGET (widget)); gtk_style_context_save (context); gtk_style_context_add_class (context, GTK_STYLE_CLASS_FRAME); gtk_style_context_get_padding (context, state, &padding); gtk_style_context_get_border (context, state, &border); minimum_req.width += padding.left + padding.right + border.left + border.right; minimum_req.height += padding.top + padding.bottom + border.top + border.bottom; natural_req.width += padding.left + padding.right + border.left + border.right; natural_req.height += padding.top + padding.bottom + border.top + border.bottom; gtk_style_context_restore (context); } if (orientation == GTK_ORIENTATION_HORIZONTAL) { *minimum_size = minimum_req.width; *natural_size = natural_req.width; } else { *minimum_size = minimum_req.height; *natural_size = natural_req.height; } } static void gtk_scrolled_window_get_preferred_width (GtkWidget *widget, gint *minimum_size, gint *natural_size) { gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size); } static void gtk_scrolled_window_get_preferred_height (GtkWidget *widget, gint *minimum_size, gint *natural_size) { gtk_scrolled_window_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size); } static void gtk_scrolled_window_get_preferred_height_for_width (GtkWidget *widget, gint width, gint *minimum_height, gint *natural_height) { g_return_if_fail (GTK_IS_WIDGET (widget)); GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, minimum_height, natural_height); } static void gtk_scrolled_window_get_preferred_width_for_height (GtkWidget *widget, gint height, gint *minimum_width, gint *natural_width) { g_return_if_fail (GTK_IS_WIDGET (widget)); GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, minimum_width, natural_width); } static void gtk_scrolled_window_realize (GtkWidget *widget) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); GtkAllocation allocation, relative_allocation; GdkWindowAttr attributes; GtkWidget *child_widget; gint attributes_mask; gtk_widget_set_realized (widget, TRUE); gtk_widget_get_allocation (widget, &allocation); gtk_scrolled_window_relative_allocation (widget, &relative_allocation); attributes.window_type = GDK_WINDOW_CHILD; attributes.x = allocation.x + relative_allocation.x; attributes.y = allocation.y + relative_allocation.y; attributes.width = allocation.width; attributes.height = allocation.height; attributes.wclass = GDK_INPUT_OUTPUT; attributes.visual = gtk_widget_get_visual (widget); attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK | GDK_BUTTON_MOTION_MASK | GDK_TOUCH_MASK | GDK_EXPOSURE_MASK; attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL; scrolled_window->priv->overshoot_window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask); gtk_widget_register_window (widget, scrolled_window->priv->overshoot_window); child_widget = gtk_bin_get_child (GTK_BIN (widget)); if (child_widget) gtk_widget_set_parent_window (child_widget, scrolled_window->priv->overshoot_window); GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->realize (widget); } static void gtk_scrolled_window_unrealize (GtkWidget *widget) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); gtk_widget_unregister_window (widget, scrolled_window->priv->overshoot_window); gdk_window_destroy (scrolled_window->priv->overshoot_window); scrolled_window->priv->overshoot_window = NULL; gtk_widget_set_realized (widget, FALSE); GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unrealize (widget); } static void gtk_scrolled_window_map (GtkWidget *widget) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); gdk_window_show (scrolled_window->priv->overshoot_window); GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->map (widget); } static void gtk_scrolled_window_unmap (GtkWidget *widget) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); gdk_window_hide (scrolled_window->priv->overshoot_window); GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->unmap (widget); } static void gtk_scrolled_window_grab_notify (GtkWidget *widget, gboolean was_grabbed) { GtkScrolledWindow *scrolled_window = GTK_SCROLLED_WINDOW (widget); GtkScrolledWindowPrivate *priv = scrolled_window->priv; if (priv->drag_device && gtk_widget_device_is_shadowed (widget, priv->drag_device)) { gdk_device_ungrab (priv->drag_device, gtk_get_current_event_time ()); priv->drag_device = NULL; if (_gtk_scrolled_window_get_overshoot (scrolled_window, NULL, NULL)) gtk_scrolled_window_start_deceleration (scrolled_window); else gtk_scrolled_window_cancel_deceleration (scrolled_window); } } /** * gtk_scrolled_window_get_min_content_width: * @scrolled_window: a #GtkScrolledWindow * * Gets the minimum content width of @scrolled_window, or -1 if not set. * * Returns: the minimum content width * * Since: 3.0 */ gint gtk_scrolled_window_get_min_content_width (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0); return scrolled_window->priv->min_content_width; } /** * gtk_scrolled_window_set_min_content_width: * @scrolled_window: a #GtkScrolledWindow * @width: the minimal content width * * Sets the minimum width that @scrolled_window should keep visible. * Note that this can and (usually will) be smaller than the minimum * size of the content. * * Since: 3.0 */ void gtk_scrolled_window_set_min_content_width (GtkScrolledWindow *scrolled_window, gint width) { GtkScrolledWindowPrivate *priv; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); priv = scrolled_window->priv; if (priv->min_content_width != width) { priv->min_content_width = width; gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); g_object_notify (G_OBJECT (scrolled_window), "min-content-width"); } } /** * gtk_scrolled_window_get_min_content_height: * @scrolled_window: a #GtkScrolledWindow * * Gets the minimal content height of @scrolled_window, or -1 if not set. * * Returns: the minimal content height * * Since: 3.0 */ gint gtk_scrolled_window_get_min_content_height (GtkScrolledWindow *scrolled_window) { g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), 0); return scrolled_window->priv->min_content_height; } /** * gtk_scrolled_window_set_min_content_height: * @scrolled_window: a #GtkScrolledWindow * @height: the minimal content height * * Sets the minimum height that @scrolled_window should keep visible. * Note that this can and (usually will) be smaller than the minimum * size of the content. * * Since: 3.0 */ void gtk_scrolled_window_set_min_content_height (GtkScrolledWindow *scrolled_window, gint height) { GtkScrolledWindowPrivate *priv; g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window)); priv = scrolled_window->priv; if (priv->min_content_height != height) { priv->min_content_height = height; gtk_widget_queue_resize (GTK_WIDGET (scrolled_window)); g_object_notify (G_OBJECT (scrolled_window), "min-content-height"); } }