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gtk2/gtk/gtkviewport.c

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/* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* 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 "gtkviewport.h"
#include "gtkintl.h"
#include "gtkmarshalers.h"
#include "gtktypeutils.h"
#include "gtkprivate.h"
/**
* SECTION:gtkviewport
* @Short_description: An adapter which makes widgets scrollable
* @Title: GtkViewport
* @See_also:#GtkScrolledWindow, #GtkAdjustment
*
* 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
* #GtkTable, #GtkBox, and so on.
*
* If a widget has native scrolling abilities, such as #GtkTextView,
* #GtkTreeView or #GtkIconview, it can be added to a #GtkScrolledWindow
* with gtk_container_add(). If a widget does not, you must first add the
* widget to a #GtkViewport, then add the viewport to the scrolled window.
* The convenience function gtk_scrolled_window_add_with_viewport() does
* exactly this, so you can ignore the presence of the viewport.
*
* The #GtkViewport will start scrolling content only if allocated less
* than the child widget's minimum size in a given orientation.
*/
struct _GtkViewportPrivate
{
GtkAdjustment *hadjustment;
GtkAdjustment *vadjustment;
GtkShadowType shadow_type;
GdkWindow *bin_window;
GdkWindow *view_window;
};
enum {
PROP_0,
PROP_HADJUSTMENT,
PROP_VADJUSTMENT,
PROP_SHADOW_TYPE
};
static void gtk_viewport_finalize (GObject *object);
static void gtk_viewport_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_viewport_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment);
static void gtk_viewport_destroy (GtkWidget *widget);
static void gtk_viewport_realize (GtkWidget *widget);
static void gtk_viewport_unrealize (GtkWidget *widget);
static gint gtk_viewport_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_viewport_add (GtkContainer *container,
GtkWidget *widget);
static void gtk_viewport_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer data);
static void gtk_viewport_style_set (GtkWidget *widget,
GtkStyle *previous_style);
static void gtk_viewport_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
static void gtk_viewport_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size);
G_DEFINE_TYPE (GtkViewport, gtk_viewport, GTK_TYPE_BIN)
static void
gtk_viewport_class_init (GtkViewportClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
gobject_class = G_OBJECT_CLASS (class);
widget_class = (GtkWidgetClass*) class;
container_class = (GtkContainerClass*) class;
gobject_class->finalize = gtk_viewport_finalize;
gobject_class->set_property = gtk_viewport_set_property;
gobject_class->get_property = gtk_viewport_get_property;
widget_class->destroy = gtk_viewport_destroy;
widget_class->realize = gtk_viewport_realize;
widget_class->unrealize = gtk_viewport_unrealize;
widget_class->draw = gtk_viewport_draw;
widget_class->size_allocate = gtk_viewport_size_allocate;
widget_class->style_set = gtk_viewport_style_set;
widget_class->get_preferred_width = gtk_viewport_get_preferred_width;
widget_class->get_preferred_height = gtk_viewport_get_preferred_height;
container_class->add = gtk_viewport_add;
class->set_scroll_adjustments = gtk_viewport_set_scroll_adjustments;
g_object_class_install_property (gobject_class,
PROP_HADJUSTMENT,
g_param_spec_object ("hadjustment",
P_("Horizontal adjustment"),
P_("The GtkAdjustment that determines the values of the horizontal position for this viewport"),
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 that determines the values of the vertical position for this viewport"),
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (gobject_class,
PROP_SHADOW_TYPE,
g_param_spec_enum ("shadow-type",
P_("Shadow type"),
P_("Determines how the shadowed box around the viewport is drawn"),
GTK_TYPE_SHADOW_TYPE,
GTK_SHADOW_IN,
GTK_PARAM_READWRITE));
/**
* GtkViewport::set-scroll-adjustments
* @horizontal: the horizontal #GtkAdjustment
* @vertical: the vertical #GtkAdjustment
*
* Set the scroll adjustments for the viewport. Usually scrolled containers
* like #GtkScrolledWindow will emit this signal to connect two instances
* of #GtkScrollbar to the scroll directions of the #GtkViewport.
*/
widget_class->set_scroll_adjustments_signal =
g_signal_new (I_("set-scroll-adjustments"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkViewportClass, set_scroll_adjustments),
NULL, NULL,
_gtk_marshal_VOID__OBJECT_OBJECT,
G_TYPE_NONE, 2,
GTK_TYPE_ADJUSTMENT,
GTK_TYPE_ADJUSTMENT);
g_type_class_add_private (class, sizeof (GtkViewportPrivate));
}
static void
gtk_viewport_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkViewport *viewport;
viewport = GTK_VIEWPORT (object);
switch (prop_id)
{
case PROP_HADJUSTMENT:
gtk_viewport_set_hadjustment (viewport, g_value_get_object (value));
break;
case PROP_VADJUSTMENT:
gtk_viewport_set_vadjustment (viewport, g_value_get_object (value));
break;
case PROP_SHADOW_TYPE:
gtk_viewport_set_shadow_type (viewport, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_viewport_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkViewport *viewport = GTK_VIEWPORT (object);
GtkViewportPrivate *priv = viewport->priv;
switch (prop_id)
{
case PROP_HADJUSTMENT:
g_value_set_object (value, priv->hadjustment);
break;
case PROP_VADJUSTMENT:
g_value_set_object (value, priv->vadjustment);
break;
case PROP_SHADOW_TYPE:
g_value_set_enum (value, priv->shadow_type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_viewport_init (GtkViewport *viewport)
{
GtkViewportPrivate *priv;
viewport->priv = G_TYPE_INSTANCE_GET_PRIVATE (viewport,
GTK_TYPE_VIEWPORT,
GtkViewportPrivate);
priv = viewport->priv;
gtk_widget_set_has_window (GTK_WIDGET (viewport), TRUE);
gtk_widget_set_redraw_on_allocate (GTK_WIDGET (viewport), FALSE);
gtk_container_set_resize_mode (GTK_CONTAINER (viewport), GTK_RESIZE_QUEUE);
priv->shadow_type = GTK_SHADOW_IN;
priv->view_window = NULL;
priv->bin_window = NULL;
priv->hadjustment = NULL;
priv->vadjustment = NULL;
}
/**
* gtk_viewport_new:
* @hadjustment: horizontal adjustment.
* @vadjustment: vertical adjustment.
* @returns: a new #GtkViewport.
*
* Creates a new #GtkViewport with the given adjustments.
*
**/
GtkWidget*
gtk_viewport_new (GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
GtkWidget *viewport;
viewport = g_object_new (GTK_TYPE_VIEWPORT,
"hadjustment", hadjustment,
"vadjustment", vadjustment,
NULL);
return viewport;
}
#define ADJUSTMENT_POINTER(viewport, orientation) \
(((orientation) == GTK_ORIENTATION_HORIZONTAL) ? \
&(viewport)->priv->hadjustment : &(viewport)->priv->vadjustment)
static void
viewport_disconnect_adjustment (GtkViewport *viewport,
GtkOrientation orientation)
{
GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
if (*adjustmentp)
{
g_signal_handlers_disconnect_by_func (*adjustmentp,
gtk_viewport_adjustment_value_changed,
viewport);
g_object_unref (*adjustmentp);
*adjustmentp = NULL;
}
}
static void
gtk_viewport_finalize (GObject *object)
{
GtkViewport *viewport = GTK_VIEWPORT (object);
viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
G_OBJECT_CLASS (gtk_viewport_parent_class)->finalize (object);
}
static void
gtk_viewport_destroy (GtkWidget *widget)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL);
viewport_disconnect_adjustment (viewport, GTK_ORIENTATION_VERTICAL);
GTK_WIDGET_CLASS (gtk_viewport_parent_class)->destroy (widget);
}
/**
* gtk_viewport_get_hadjustment:
* @viewport: a #GtkViewport.
*
* Returns the horizontal adjustment of the viewport.
*
* Return value: (transfer none): the horizontal adjustment of @viewport.
**/
GtkAdjustment*
gtk_viewport_get_hadjustment (GtkViewport *viewport)
{
GtkViewportPrivate *priv;
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
priv = viewport->priv;
if (!priv->hadjustment)
gtk_viewport_set_hadjustment (viewport, NULL);
return priv->hadjustment;
}
/**
* gtk_viewport_get_vadjustment:
* @viewport: a #GtkViewport.
*
* Returns the vertical adjustment of the viewport.
*
* Return value: (transfer none): the vertical adjustment of @viewport.
**/
GtkAdjustment*
gtk_viewport_get_vadjustment (GtkViewport *viewport)
{
GtkViewportPrivate *priv;
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
priv = viewport->priv;
if (!priv->vadjustment)
gtk_viewport_set_vadjustment (viewport, NULL);
return priv->vadjustment;
}
static void
viewport_get_view_allocation (GtkViewport *viewport,
GtkAllocation *view_allocation)
{
GtkViewportPrivate *priv = viewport->priv;
GtkStyle *style;
GtkWidget *widget = GTK_WIDGET (viewport);
GtkAllocation allocation;
guint border_width;
gtk_widget_get_allocation (widget, &allocation);
border_width = gtk_container_get_border_width (GTK_CONTAINER (viewport));
view_allocation->x = 0;
view_allocation->y = 0;
if (priv->shadow_type != GTK_SHADOW_NONE)
{
style = gtk_widget_get_style (widget);
view_allocation->x = style->xthickness;
view_allocation->y = style->ythickness;
}
view_allocation->width = MAX (1, allocation.width - view_allocation->x * 2 - border_width * 2);
view_allocation->height = MAX (1, allocation.height - view_allocation->y * 2 - border_width * 2);
}
static void
viewport_reclamp_adjustment (GtkAdjustment *adjustment,
gboolean *value_changed)
{
gdouble value = adjustment->value;
value = CLAMP (value, 0, adjustment->upper - adjustment->page_size);
if (value != adjustment->value)
{
adjustment->value = value;
if (value_changed)
*value_changed = TRUE;
}
else if (value_changed)
*value_changed = FALSE;
}
static void
viewport_set_hadjustment_values (GtkViewport *viewport,
gboolean *value_changed)
{
GtkBin *bin = GTK_BIN (viewport);
GtkAllocation view_allocation;
GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
GtkWidget *child;
gdouble old_page_size;
gdouble old_upper;
gdouble old_value;
viewport_get_view_allocation (viewport, &view_allocation);
old_page_size = hadjustment->page_size;
old_upper = hadjustment->upper;
old_value = hadjustment->value;
hadjustment->page_size = view_allocation.width;
hadjustment->step_increment = view_allocation.width * 0.1;
hadjustment->page_increment = view_allocation.width * 0.9;
hadjustment->lower = 0;
child = gtk_bin_get_child (bin);
if (child && gtk_widget_get_visible (child))
{
gint minimum_width;
gtk_widget_get_preferred_width_for_height (child,
view_allocation.height,
&minimum_width,
NULL);
hadjustment->upper = MAX (minimum_width, view_allocation.width);
}
else
hadjustment->upper = view_allocation.width;
if (gtk_widget_get_direction (GTK_WIDGET (viewport)) == GTK_TEXT_DIR_RTL)
{
gdouble dist = old_upper - (old_value + old_page_size);
hadjustment->value = hadjustment->upper - dist - hadjustment->page_size;
viewport_reclamp_adjustment (hadjustment, value_changed);
*value_changed = (old_value != hadjustment->value);
}
else
viewport_reclamp_adjustment (hadjustment, value_changed);
}
static void
viewport_set_vadjustment_values (GtkViewport *viewport,
gboolean *value_changed)
{
GtkBin *bin = GTK_BIN (viewport);
GtkAllocation view_allocation;
GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
GtkWidget *child;
viewport_get_view_allocation (viewport, &view_allocation);
vadjustment->page_size = view_allocation.height;
vadjustment->step_increment = view_allocation.height * 0.1;
vadjustment->page_increment = view_allocation.height * 0.9;
vadjustment->lower = 0;
child = gtk_bin_get_child (bin);
if (child && gtk_widget_get_visible (child))
{
gint minimum_height;
gtk_widget_get_preferred_height_for_width (child,
view_allocation.width,
&minimum_height,
NULL);
vadjustment->upper = MAX (minimum_height, view_allocation.height);
}
else
vadjustment->upper = view_allocation.height;
viewport_reclamp_adjustment (vadjustment, value_changed);
}
static void
viewport_set_adjustment (GtkViewport *viewport,
GtkOrientation orientation,
GtkAdjustment *adjustment)
{
GtkAdjustment **adjustmentp = ADJUSTMENT_POINTER (viewport, orientation);
gboolean value_changed;
if (adjustment && adjustment == *adjustmentp)
return;
if (!adjustment)
adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
viewport_disconnect_adjustment (viewport, orientation);
*adjustmentp = adjustment;
g_object_ref_sink (adjustment);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
viewport_set_hadjustment_values (viewport, &value_changed);
else
viewport_set_vadjustment_values (viewport, &value_changed);
g_signal_connect (adjustment, "value-changed",
G_CALLBACK (gtk_viewport_adjustment_value_changed),
viewport);
gtk_adjustment_changed (adjustment);
if (value_changed)
gtk_adjustment_value_changed (adjustment);
else
gtk_viewport_adjustment_value_changed (adjustment, viewport);
}
/**
* gtk_viewport_set_hadjustment:
* @viewport: a #GtkViewport.
* @adjustment: (allow-none): a #GtkAdjustment.
*
* Sets the horizontal adjustment of the viewport.
**/
void
gtk_viewport_set_hadjustment (GtkViewport *viewport,
GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
viewport_set_adjustment (viewport, GTK_ORIENTATION_HORIZONTAL, adjustment);
g_object_notify (G_OBJECT (viewport), "hadjustment");
}
/**
* gtk_viewport_set_vadjustment:
* @viewport: a #GtkViewport.
* @adjustment: (allow-none): a #GtkAdjustment.
*
* Sets the vertical adjustment of the viewport.
**/
void
gtk_viewport_set_vadjustment (GtkViewport *viewport,
GtkAdjustment *adjustment)
{
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
if (adjustment)
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
viewport_set_adjustment (viewport, GTK_ORIENTATION_VERTICAL, adjustment);
g_object_notify (G_OBJECT (viewport), "vadjustment");
}
static void
gtk_viewport_set_scroll_adjustments (GtkViewport *viewport,
GtkAdjustment *hadjustment,
GtkAdjustment *vadjustment)
{
gtk_viewport_set_hadjustment (viewport, hadjustment);
gtk_viewport_set_vadjustment (viewport, vadjustment);
}
/**
* gtk_viewport_set_shadow_type:
* @viewport: a #GtkViewport.
* @type: the new shadow type.
*
* Sets the shadow type of the viewport.
**/
void
gtk_viewport_set_shadow_type (GtkViewport *viewport,
GtkShadowType type)
{
GtkViewportPrivate *priv;
GtkAllocation allocation;
GtkWidget *widget;
g_return_if_fail (GTK_IS_VIEWPORT (viewport));
widget = GTK_WIDGET (viewport);
priv = viewport->priv;
if ((GtkShadowType) priv->shadow_type != type)
{
priv->shadow_type = type;
if (gtk_widget_get_visible (widget))
{
gtk_widget_get_allocation (widget, &allocation);
gtk_widget_size_allocate (widget, &allocation);
gtk_widget_set_allocation (widget, &allocation);
gtk_widget_queue_draw (widget);
}
g_object_notify (G_OBJECT (viewport), "shadow-type");
}
}
/**
* gtk_viewport_get_shadow_type:
* @viewport: a #GtkViewport
*
* Gets the shadow type of the #GtkViewport. See
* gtk_viewport_set_shadow_type().
*
* Return value: the shadow type
**/
GtkShadowType
gtk_viewport_get_shadow_type (GtkViewport *viewport)
{
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), GTK_SHADOW_NONE);
return viewport->priv->shadow_type;
}
/**
* gtk_viewport_get_bin_window:
* @viewport: a #GtkViewport
*
* Gets the bin window of the #GtkViewport.
*
* Return value: (transfer none): a #GdkWindow
*
* Since: 2.20
**/
GdkWindow*
gtk_viewport_get_bin_window (GtkViewport *viewport)
{
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
return viewport->priv->bin_window;
}
/**
* gtk_viewport_get_view_window:
* @viewport: a #GtkViewport
*
* Gets the view window of the #GtkViewport.
*
* Return value: (transfer none): a #GdkWindow
*
* Since: 2.22
**/
GdkWindow*
gtk_viewport_get_view_window (GtkViewport *viewport)
{
g_return_val_if_fail (GTK_IS_VIEWPORT (viewport), NULL);
return viewport->priv->view_window;
}
static void
gtk_viewport_realize (GtkWidget *widget)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkViewportPrivate *priv = viewport->priv;
GtkBin *bin = GTK_BIN (widget);
GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
GtkAllocation allocation;
GtkAllocation view_allocation;
GtkStyle *style;
GtkWidget *child;
GdkWindow *window;
GdkWindowAttr attributes;
gint attributes_mask;
gint event_mask;
guint border_width;
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attributes.x = allocation.x + border_width;
attributes.y = allocation.y + border_width;
attributes.width = allocation.width - border_width * 2;
attributes.height = allocation.height - border_width * 2;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
/* We select on button_press_mask so that button 4-5 scrolls are trapped.
*/
attributes.event_mask = event_mask | GDK_BUTTON_PRESS_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gtk_widget_set_window (widget, window);
gdk_window_set_user_data (window, viewport);
viewport_get_view_allocation (viewport, &view_allocation);
attributes.x = view_allocation.x;
attributes.y = view_allocation.y;
attributes.width = view_allocation.width;
attributes.height = view_allocation.height;
attributes.event_mask = 0;
priv->view_window = gdk_window_new (window,
&attributes, attributes_mask);
gdk_window_set_user_data (priv->view_window, viewport);
attributes.x = - hadjustment->value;
attributes.y = - vadjustment->value;
attributes.width = hadjustment->upper;
attributes.height = vadjustment->upper;
attributes.event_mask = event_mask;
priv->bin_window = gdk_window_new (priv->view_window, &attributes, attributes_mask);
gdk_window_set_user_data (priv->bin_window, viewport);
child = gtk_bin_get_child (bin);
if (child)
gtk_widget_set_parent_window (child, priv->bin_window);
gtk_widget_style_attach (widget);
style = gtk_widget_get_style (widget);
gtk_style_set_background (style, window, GTK_STATE_NORMAL);
gtk_style_set_background (style, priv->bin_window, GTK_STATE_NORMAL);
gdk_window_show (priv->bin_window);
gdk_window_show (priv->view_window);
}
static void
gtk_viewport_unrealize (GtkWidget *widget)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkViewportPrivate *priv = viewport->priv;
gdk_window_set_user_data (priv->view_window, NULL);
gdk_window_destroy (priv->view_window);
priv->view_window = NULL;
gdk_window_set_user_data (priv->bin_window, NULL);
gdk_window_destroy (priv->bin_window);
priv->bin_window = NULL;
GTK_WIDGET_CLASS (gtk_viewport_parent_class)->unrealize (widget);
}
static gint
gtk_viewport_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkViewportPrivate *priv = viewport->priv;
int x, y;
if (gtk_cairo_should_draw_window (cr, gtk_widget_get_window (widget)))
{
gtk_paint_shadow (gtk_widget_get_style (widget),
cr,
GTK_STATE_NORMAL, priv->shadow_type,
widget, "viewport",
0, 0,
gdk_window_get_width (gtk_widget_get_window (widget)),
gdk_window_get_height (gtk_widget_get_window (widget)));
}
if (gtk_cairo_should_draw_window (cr, priv->view_window))
{
/* This is a cute hack to ensure the contents of bin_window are
* restricted to where they are visible. We only need to do this
* clipping when called via gtk_widget_draw() and not in expose
* events. And when that happens every window (including this one)
* should be drawn.
*/
gdk_window_get_position (priv->view_window, &x, &y);
cairo_rectangle (cr, x, y,
gdk_window_get_width (priv->view_window),
gdk_window_get_height (priv->view_window));
cairo_clip (cr);
}
if (gtk_cairo_should_draw_window (cr, priv->bin_window))
{
gdk_window_get_position (priv->bin_window, &x, &y);
gtk_paint_flat_box (gtk_widget_get_style (widget), cr,
GTK_STATE_NORMAL, GTK_SHADOW_NONE,
widget, "viewportbin",
x, y,
gdk_window_get_width (priv->bin_window),
gdk_window_get_height (priv->bin_window));
GTK_WIDGET_CLASS (gtk_viewport_parent_class)->draw (widget, cr);
}
return FALSE;
}
static void
gtk_viewport_add (GtkContainer *container,
GtkWidget *child)
{
GtkBin *bin = GTK_BIN (container);
GtkViewport *viewport = GTK_VIEWPORT (bin);
GtkViewportPrivate *priv = viewport->priv;
g_return_if_fail (gtk_bin_get_child (bin) == NULL);
gtk_widget_set_parent_window (child, priv->bin_window);
GTK_CONTAINER_CLASS (gtk_viewport_parent_class)->add (container, child);
}
static void
gtk_viewport_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkAllocation widget_allocation;
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkViewportPrivate *priv = viewport->priv;
GtkBin *bin = GTK_BIN (widget);
guint border_width;
gboolean hadjustment_value_changed, vadjustment_value_changed;
GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
GtkAllocation child_allocation;
GtkWidget *child;
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
/* If our size changed, and we have a shadow, queue a redraw on widget->window to
* redraw the shadow correctly.
*/
gtk_widget_get_allocation (widget, &widget_allocation);
if (gtk_widget_get_mapped (widget) &&
priv->shadow_type != GTK_SHADOW_NONE &&
(widget_allocation.width != allocation->width ||
widget_allocation.height != allocation->height))
gdk_window_invalidate_rect (gtk_widget_get_window (widget), NULL, FALSE);
gtk_widget_set_allocation (widget, allocation);
viewport_set_hadjustment_values (viewport, &hadjustment_value_changed);
viewport_set_vadjustment_values (viewport, &vadjustment_value_changed);
child_allocation.x = 0;
child_allocation.y = 0;
child_allocation.width = hadjustment->upper;
child_allocation.height = vadjustment->upper;
if (gtk_widget_get_realized (widget))
{
GtkAllocation view_allocation;
gdk_window_move_resize (gtk_widget_get_window (widget),
allocation->x + border_width,
allocation->y + border_width,
allocation->width - border_width * 2,
allocation->height - border_width * 2);
viewport_get_view_allocation (viewport, &view_allocation);
gdk_window_move_resize (priv->view_window,
view_allocation.x,
view_allocation.y,
view_allocation.width,
view_allocation.height);
gdk_window_move_resize (priv->bin_window,
- hadjustment->value,
- vadjustment->value,
child_allocation.width,
child_allocation.height);
}
child = gtk_bin_get_child (bin);
if (child && gtk_widget_get_visible (child))
gtk_widget_size_allocate (child, &child_allocation);
gtk_adjustment_changed (hadjustment);
gtk_adjustment_changed (vadjustment);
if (hadjustment_value_changed)
gtk_adjustment_value_changed (hadjustment);
if (vadjustment_value_changed)
gtk_adjustment_value_changed (vadjustment);
}
static void
gtk_viewport_adjustment_value_changed (GtkAdjustment *adjustment,
gpointer data)
{
GtkViewport *viewport = GTK_VIEWPORT (data);
GtkViewportPrivate *priv = viewport->priv;
GtkBin *bin = GTK_BIN (data);
GtkWidget *child;
child = gtk_bin_get_child (bin);
if (child && gtk_widget_get_visible (child) &&
gtk_widget_get_realized (GTK_WIDGET (viewport)))
{
GtkAdjustment *hadjustment = gtk_viewport_get_hadjustment (viewport);
GtkAdjustment *vadjustment = gtk_viewport_get_vadjustment (viewport);
gint old_x, old_y;
gint new_x, new_y;
gdk_window_get_position (priv->bin_window, &old_x, &old_y);
new_x = - hadjustment->value;
new_y = - vadjustment->value;
if (new_x != old_x || new_y != old_y)
{
gdk_window_move (priv->bin_window, new_x, new_y);
gdk_window_process_updates (priv->bin_window, TRUE);
}
}
}
static void
gtk_viewport_style_set (GtkWidget *widget,
GtkStyle *previous_style)
{
if (gtk_widget_get_realized (widget) &&
gtk_widget_get_has_window (widget))
{
GtkStyle *style;
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkViewportPrivate *priv = viewport->priv;
style = gtk_widget_get_style (widget);
gtk_style_set_background (style, priv->bin_window, GTK_STATE_NORMAL);
gtk_style_set_background (style,
gtk_widget_get_window (widget),
gtk_widget_get_state (widget));
}
}
static void
gtk_viewport_get_preferred_size (GtkWidget *widget,
GtkOrientation orientation,
gint *minimum_size,
gint *natural_size)
{
GtkViewport *viewport = GTK_VIEWPORT (widget);
GtkViewportPrivate *priv = viewport->priv;
GtkStyle *style;
GtkWidget *child;
gint child_min, child_nat;
gint minimum, natural;
child = gtk_bin_get_child (GTK_BIN (widget));
/* XXX This should probably be (border_width * 2); but GTK+ has
* been doing this with a single border for a while now...
*/
minimum = gtk_container_get_border_width (GTK_CONTAINER (widget));
if (priv->shadow_type != GTK_SHADOW_NONE)
{
style = gtk_widget_get_style (GTK_WIDGET (widget));
if (orientation == GTK_ORIENTATION_HORIZONTAL)
minimum += 2 * style->xthickness;
else
minimum += 2 * style->ythickness;
}
natural = minimum;
if (child && gtk_widget_get_visible (child))
{
if (orientation == GTK_ORIENTATION_HORIZONTAL)
gtk_widget_get_preferred_width (child, &child_min, &child_nat);
else
gtk_widget_get_preferred_height (child, &child_min, &child_nat);
minimum += child_min;
natural += child_nat;
}
if (minimum_size)
*minimum_size = minimum;
if (natural_size)
*natural_size = natural;
}
static void
gtk_viewport_get_preferred_width (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
}
static void
gtk_viewport_get_preferred_height (GtkWidget *widget,
gint *minimum_size,
gint *natural_size)
{
gtk_viewport_get_preferred_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
}
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