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gtk2/gtk/gtkbutton.c
Timm Bäder 9992a616ef widget: Use ::measure vfunc to measure size 
Add a new ::measure vfunc similar to GtkCssGadget's that widget
implementations have to override instead of the old get_preferred_width,
get_preferred_height, get_preferred_width_for_height,
get_preferred_height_for_width and
get_preferred_height_and_baseline_for_width.
2016-10-22 19:05:47 +02:00

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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, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2001. 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/.
*/
/**
* SECTION:gtkbutton
* @Short_description: A widget that emits a signal when clicked on
* @Title: GtkButton
*
* The #GtkButton widget is generally used to trigger a callback function that is
* called when the button is pressed. The various signals and how to use them
* are outlined below.
*
* The #GtkButton widget can hold any valid child widget. That is, it can hold
* almost any other standard #GtkWidget. The most commonly used child is the
* #GtkLabel.
*
* # CSS nodes
*
* GtkButton has a single CSS node with name button. The node will get the
* style classes .image-button or .text-button, if the content is just an
* image or label, respectively. It may also receive the .flat style class.
*
* Other style classes that are commonly used with GtkButton include
* .suggested-action and .destructive-action. In special cases, buttons
* can be made round by adding the .circular style class.
*
* Button-like widgets like #GtkToggleButton, #GtkMenuButton, #GtkVolumeButton,
* #GtkLockButton, #GtkColorButton, #GtkFontButton or #GtkFileChooserButton use
* style classes such as .toggle, .popup, .scale, .lock, .color, .font, .file
* to differentiate themselves from a plain GtkButton.
*/
#include "config.h"
#include "gtkbutton.h"
#include "gtkbuttonprivate.h"
#include <string.h>
#include "gtklabel.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkimage.h"
#include "gtkbox.h"
#include "gtksizerequest.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "a11y/gtkbuttonaccessible.h"
#include "gtkapplicationprivate.h"
#include "gtkactionhelper.h"
#include "gtkcsscustomgadgetprivate.h"
#include "gtkcontainerprivate.h"
/* Time out before giving up on getting a key release when animating
* the close button.
*/
#define ACTIVATE_TIMEOUT 250
enum {
CLICKED,
ENTER,
LEAVE,
ACTIVATE,
LAST_SIGNAL
};
enum {
PROP_0,
PROP_LABEL,
PROP_RELIEF,
PROP_USE_UNDERLINE,
PROP_ICON_NAME,
/* actionable properties */
PROP_ACTION_NAME,
PROP_ACTION_TARGET,
LAST_PROP = PROP_ACTION_NAME
};
enum {
LABEL_CHILD,
ICON_CHILD,
WIDGET_CHILD
};
static void gtk_button_finalize (GObject *object);
static void gtk_button_dispose (GObject *object);
static void gtk_button_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_button_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_button_screen_changed (GtkWidget *widget,
GdkScreen *previous_screen);
static void gtk_button_realize (GtkWidget * widget);
static void gtk_button_unrealize (GtkWidget * widget);
static void gtk_button_map (GtkWidget * widget);
static void gtk_button_unmap (GtkWidget * widget);
static void gtk_button_size_allocate (GtkWidget * widget,
GtkAllocation * allocation);
static GskRenderNode *gtk_button_get_render_node (GtkWidget *widget,
GskRenderer *renderer);
static gint gtk_button_grab_broken (GtkWidget * widget,
GdkEventGrabBroken * event);
static gint gtk_button_key_release (GtkWidget * widget, GdkEventKey * event);
static gint gtk_button_enter_notify (GtkWidget * widget,
GdkEventCrossing * event);
static gint gtk_button_leave_notify (GtkWidget * widget,
GdkEventCrossing * event);
static void gtk_real_button_clicked (GtkButton * button);
static void gtk_real_button_activate (GtkButton *button);
static void gtk_button_update_state (GtkButton *button);
static void gtk_button_finish_activate (GtkButton *button,
gboolean do_it);
static void gtk_button_state_changed (GtkWidget *widget,
GtkStateType previous_state);
static void gtk_button_grab_notify (GtkWidget *widget,
gboolean was_grabbed);
static void gtk_button_do_release (GtkButton *button,
gboolean emit_clicked);
static void gtk_button_actionable_iface_init (GtkActionableInterface *iface);
static void gtk_button_measure_ (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline);
static void gtk_button_measure (GtkCssGadget *gadget,
GtkOrientation orientation,
int for_size,
int *minimum_size,
int *natural_size,
int *minimum_baseline,
int *natural_baseline,
gpointer data);
static void gtk_button_allocate (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer data);
static void gtk_button_set_child_type (GtkButton *button, guint child_type);
static GParamSpec *props[LAST_PROP] = { NULL, };
static guint button_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE_WITH_CODE (GtkButton, gtk_button, GTK_TYPE_BIN,
G_ADD_PRIVATE (GtkButton)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ACTIONABLE, gtk_button_actionable_iface_init))
static void
gtk_button_add (GtkContainer *container, GtkWidget *child)
{
GtkButton *button = GTK_BUTTON (container);
if (button->priv->child_type != WIDGET_CHILD)
gtk_container_remove (container, gtk_bin_get_child (GTK_BIN (button)));
gtk_button_set_child_type (button, WIDGET_CHILD);
GTK_CONTAINER_CLASS (gtk_button_parent_class)->add (container, child);
}
static void
gtk_button_remove (GtkContainer *container, GtkWidget *child)
{
GtkButton *button = GTK_BUTTON (container);
gtk_button_set_child_type (button, WIDGET_CHILD);
GTK_CONTAINER_CLASS (gtk_button_parent_class)->remove (container, child);
}
static void
gtk_button_class_init (GtkButtonClass *klass)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
gobject_class = G_OBJECT_CLASS (klass);
widget_class = (GtkWidgetClass*) klass;
container_class = GTK_CONTAINER_CLASS (klass);
gobject_class->dispose = gtk_button_dispose;
gobject_class->finalize = gtk_button_finalize;
gobject_class->set_property = gtk_button_set_property;
gobject_class->get_property = gtk_button_get_property;
widget_class->measure = gtk_button_measure_;
widget_class->screen_changed = gtk_button_screen_changed;
widget_class->realize = gtk_button_realize;
widget_class->unrealize = gtk_button_unrealize;
widget_class->map = gtk_button_map;
widget_class->unmap = gtk_button_unmap;
widget_class->size_allocate = gtk_button_size_allocate;
widget_class->get_render_node = gtk_button_get_render_node;
widget_class->grab_broken_event = gtk_button_grab_broken;
widget_class->key_release_event = gtk_button_key_release;
widget_class->enter_notify_event = gtk_button_enter_notify;
widget_class->leave_notify_event = gtk_button_leave_notify;
widget_class->state_changed = gtk_button_state_changed;
widget_class->grab_notify = gtk_button_grab_notify;
container_class->add = gtk_button_add;
container_class->remove = gtk_button_remove;
klass->clicked = NULL;
klass->activate = gtk_real_button_activate;
props[PROP_LABEL] =
g_param_spec_string ("label",
P_("Label"),
P_("Text of the label widget inside the button, if the button contains a label widget"),
NULL,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
props[PROP_USE_UNDERLINE] =
g_param_spec_boolean ("use-underline",
P_("Use underline"),
P_("If set, an underline in the text indicates the next character should be used for the mnemonic accelerator key"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
props[PROP_RELIEF] =
g_param_spec_enum ("relief",
P_("Border relief"),
P_("The border relief style"),
GTK_TYPE_RELIEF_STYLE,
GTK_RELIEF_NORMAL,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
props[PROP_ICON_NAME] =
g_param_spec_string ("icon-name",
P_("Icon Name"),
P_("The name of the icon used to automatically populate the button"),
NULL,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (gobject_class, LAST_PROP, props);
g_object_class_override_property (gobject_class, PROP_ACTION_NAME, "action-name");
g_object_class_override_property (gobject_class, PROP_ACTION_TARGET, "action-target");
/**
* GtkButton::clicked:
* @button: the object that received the signal
*
* Emitted when the button has been activated (pressed and released).
*/
button_signals[CLICKED] =
g_signal_new (I_("clicked"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkButtonClass, clicked),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GtkButton::activate:
* @widget: the object which received the signal.
*
* The ::activate signal on GtkButton is an action signal and
* emitting it causes the button to animate press then release.
* Applications should never connect to this signal, but use the
* #GtkButton::clicked signal.
*/
button_signals[ACTIVATE] =
g_signal_new (I_("activate"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkButtonClass, activate),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
widget_class->activate_signal = button_signals[ACTIVATE];
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_BUTTON_ACCESSIBLE);
gtk_widget_class_set_css_name (widget_class, "button");
}
static void
multipress_pressed_cb (GtkGestureMultiPress *gesture,
guint n_press,
gdouble x,
gdouble y,
GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if (gtk_widget_get_focus_on_click (widget) && !gtk_widget_has_focus (widget))
gtk_widget_grab_focus (widget);
priv->in_button = TRUE;
if (!priv->activate_timeout)
{
priv->button_down = TRUE;
gtk_button_update_state (button);
}
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
}
static gboolean
touch_release_in_button (GtkButton *button)
{
GtkButtonPrivate *priv;
gint width, height;
GdkEvent *event;
gdouble x, y;
priv = button->priv;
event = gtk_get_current_event ();
if (!event)
return FALSE;
if (event->type != GDK_TOUCH_END ||
event->touch.window != priv->event_window)
{
gdk_event_free (event);
return FALSE;
}
gdk_event_get_coords (event, &x, &y);
width = gdk_window_get_width (priv->event_window);
height = gdk_window_get_height (priv->event_window);
gdk_event_free (event);
if (x >= 0 && x <= width &&
y >= 0 && y <= height)
return TRUE;
return FALSE;
}
static void
multipress_released_cb (GtkGestureMultiPress *gesture,
guint n_press,
gdouble x,
gdouble y,
GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
GdkEventSequence *sequence;
gtk_button_do_release (button,
gtk_widget_is_sensitive (GTK_WIDGET (button)) &&
(button->priv->in_button ||
touch_release_in_button (button)));
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
if (sequence)
{
priv->in_button = FALSE;
gtk_button_update_state (button);
}
}
static void
multipress_gesture_update_cb (GtkGesture *gesture,
GdkEventSequence *sequence,
GtkButton *button)
{
GtkButtonPrivate *priv = button->priv;
GtkAllocation allocation;
gboolean in_button;
gdouble x, y;
if (sequence != gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture)))
return;
gtk_widget_get_allocation (GTK_WIDGET (button), &allocation);
gtk_gesture_get_point (gesture, sequence, &x, &y);
in_button = (x >= 0 && y >= 0 && x < allocation.width && y < allocation.height);
if (priv->in_button != in_button)
{
priv->in_button = in_button;
gtk_button_update_state (button);
}
}
static void
multipress_gesture_cancel_cb (GtkGesture *gesture,
GdkEventSequence *sequence,
GtkButton *button)
{
gtk_button_do_release (button, FALSE);
}
static void
gtk_button_set_child_type (GtkButton *button, guint child_type)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (priv->child_type == child_type)
return;
if (child_type != LABEL_CHILD)
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_LABEL]);
else if (child_type != ICON_CHILD)
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_ICON_NAME]);
priv->child_type = child_type;
}
static void
gtk_button_init (GtkButton *button)
{
GtkButtonPrivate *priv;
button->priv = gtk_button_get_instance_private (button);
priv = button->priv;
gtk_widget_set_can_focus (GTK_WIDGET (button), TRUE);
gtk_widget_set_receives_default (GTK_WIDGET (button), TRUE);
gtk_widget_set_has_window (GTK_WIDGET (button), FALSE);
priv->in_button = FALSE;
priv->button_down = FALSE;
priv->use_underline = FALSE;
priv->child_type = WIDGET_CHILD;
priv->gesture = gtk_gesture_multi_press_new (GTK_WIDGET (button));
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->gesture), FALSE);
gtk_gesture_single_set_exclusive (GTK_GESTURE_SINGLE (priv->gesture), TRUE);
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->gesture), GDK_BUTTON_PRIMARY);
g_signal_connect (priv->gesture, "pressed", G_CALLBACK (multipress_pressed_cb), button);
g_signal_connect (priv->gesture, "released", G_CALLBACK (multipress_released_cb), button);
g_signal_connect (priv->gesture, "update", G_CALLBACK (multipress_gesture_update_cb), button);
g_signal_connect (priv->gesture, "cancel", G_CALLBACK (multipress_gesture_cancel_cb), button);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->gesture), GTK_PHASE_BUBBLE);
priv->gadget = gtk_css_custom_gadget_new_for_node (gtk_widget_get_css_node (GTK_WIDGET (button)),
GTK_WIDGET (button),
gtk_button_measure,
gtk_button_allocate,
NULL,
NULL,
NULL);
}
static void
gtk_button_finalize (GObject *object)
{
GtkButton *button = GTK_BUTTON (object);
GtkButtonPrivate *priv = button->priv;
g_clear_object (&priv->gesture);
g_clear_object (&priv->gadget);
G_OBJECT_CLASS (gtk_button_parent_class)->finalize (object);
}
static void
gtk_button_dispose (GObject *object)
{
GtkButton *button = GTK_BUTTON (object);
GtkButtonPrivate *priv = button->priv;
g_clear_object (&priv->action_helper);
G_OBJECT_CLASS (gtk_button_parent_class)->dispose (object);
}
static void
gtk_button_set_action_name (GtkActionable *actionable,
const gchar *action_name)
{
GtkButton *button = GTK_BUTTON (actionable);
if (!button->priv->action_helper)
button->priv->action_helper = gtk_action_helper_new (actionable);
g_signal_handlers_disconnect_by_func (button, gtk_real_button_clicked, NULL);
if (action_name)
g_signal_connect_after (button, "clicked", G_CALLBACK (gtk_real_button_clicked), NULL);
gtk_action_helper_set_action_name (button->priv->action_helper, action_name);
}
static void
gtk_button_set_action_target_value (GtkActionable *actionable,
GVariant *action_target)
{
GtkButton *button = GTK_BUTTON (actionable);
if (!button->priv->action_helper)
button->priv->action_helper = gtk_action_helper_new (actionable);
gtk_action_helper_set_action_target_value (button->priv->action_helper, action_target);
}
static void
gtk_button_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkButton *button = GTK_BUTTON (object);
switch (prop_id)
{
case PROP_LABEL:
gtk_button_set_label (button, g_value_get_string (value));
break;
case PROP_RELIEF:
gtk_button_set_relief (button, g_value_get_enum (value));
break;
case PROP_USE_UNDERLINE:
gtk_button_set_use_underline (button, g_value_get_boolean (value));
break;
case PROP_ICON_NAME:
gtk_button_set_icon_name (button, g_value_get_string (value));
break;
case PROP_ACTION_NAME:
gtk_button_set_action_name (GTK_ACTIONABLE (button), g_value_get_string (value));
break;
case PROP_ACTION_TARGET:
gtk_button_set_action_target_value (GTK_ACTIONABLE (button), g_value_get_variant (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_button_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkButton *button = GTK_BUTTON (object);
GtkButtonPrivate *priv = button->priv;
switch (prop_id)
{
case PROP_LABEL:
g_value_set_string (value, gtk_button_get_label (button));
break;
case PROP_RELIEF:
g_value_set_enum (value, gtk_button_get_relief (button));
break;
case PROP_USE_UNDERLINE:
g_value_set_boolean (value, priv->use_underline);
break;
case PROP_ICON_NAME:
g_value_set_string (value, gtk_button_get_icon_name (button));
break;
case PROP_ACTION_NAME:
g_value_set_string (value, gtk_action_helper_get_action_name (priv->action_helper));
break;
case PROP_ACTION_TARGET:
g_value_set_variant (value, gtk_action_helper_get_action_target_value (priv->action_helper));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static const gchar *
gtk_button_get_action_name (GtkActionable *actionable)
{
GtkButton *button = GTK_BUTTON (actionable);
return gtk_action_helper_get_action_name (button->priv->action_helper);
}
static GVariant *
gtk_button_get_action_target_value (GtkActionable *actionable)
{
GtkButton *button = GTK_BUTTON (actionable);
return gtk_action_helper_get_action_target_value (button->priv->action_helper);
}
static void
gtk_button_actionable_iface_init (GtkActionableInterface *iface)
{
iface->get_action_name = gtk_button_get_action_name;
iface->set_action_name = gtk_button_set_action_name;
iface->get_action_target_value = gtk_button_get_action_target_value;
iface->set_action_target_value = gtk_button_set_action_target_value;
}
/**
* gtk_button_new:
*
* Creates a new #GtkButton widget. To add a child widget to the button,
* use gtk_container_add().
*
* Returns: The newly created #GtkButton widget.
*/
GtkWidget*
gtk_button_new (void)
{
return g_object_new (GTK_TYPE_BUTTON, NULL);
}
/**
* gtk_button_new_with_label:
* @label: The text you want the #GtkLabel to hold.
*
* Creates a #GtkButton widget with a #GtkLabel child containing the given
* text.
*
* Returns: The newly created #GtkButton widget.
*/
GtkWidget*
gtk_button_new_with_label (const gchar *label)
{
return g_object_new (GTK_TYPE_BUTTON, "label", label, NULL);
}
/**
* gtk_button_new_from_icon_name:
* @icon_name: an icon name
* @size: (type int): an icon size (#GtkIconSize)
*
* Creates a new button containing an icon from the current icon theme.
*
* If the icon name isn’t known, a “broken image” icon will be
* displayed instead. If the current icon theme is changed, the icon
* will be updated appropriately.
*
* This function is a convenience wrapper around gtk_button_new() and
* gtk_button_set_image().
*
* Returns: a new #GtkButton displaying the themed icon
*
* Since: 3.10
*/
GtkWidget*
gtk_button_new_from_icon_name (const gchar *icon_name,
GtkIconSize size)
{
GtkWidget *button;
GtkWidget *image;
image = gtk_image_new_from_icon_name (icon_name, size);
button = g_object_new (GTK_TYPE_BUTTON, NULL);
gtk_container_add (GTK_CONTAINER (button), image);
return button;
}
/**
* gtk_button_new_with_mnemonic:
* @label: The text of the button, with an underscore in front of the
* mnemonic character
*
* Creates a new #GtkButton containing a label.
* If characters in @label are preceded by an underscore, they are underlined.
* If you need a literal underscore character in a label, use “__” (two
* underscores). The first underlined character represents a keyboard
* accelerator called a mnemonic.
* Pressing Alt and that key activates the button.
*
* Returns: a new #GtkButton
*/
GtkWidget*
gtk_button_new_with_mnemonic (const gchar *label)
{
return g_object_new (GTK_TYPE_BUTTON, "label", label, "use-underline", TRUE, NULL);
}
/**
* gtk_button_clicked:
* @button: The #GtkButton you want to send the signal to.
*
* Emits a #GtkButton::clicked signal to the given #GtkButton.
*/
void
gtk_button_clicked (GtkButton *button)
{
g_return_if_fail (GTK_IS_BUTTON (button));
g_signal_emit (button, button_signals[CLICKED], 0);
}
/**
* gtk_button_set_relief:
* @button: The #GtkButton you want to set relief styles of
* @relief: The GtkReliefStyle as described above
*
* Sets the relief style of the edges of the given #GtkButton widget.
* Two styles exist, %GTK_RELIEF_NORMAL and %GTK_RELIEF_NONE.
* The default style is, as one can guess, %GTK_RELIEF_NORMAL.
* The deprecated value %GTK_RELIEF_HALF behaves the same as
* %GTK_RELIEF_NORMAL.
*/
void
gtk_button_set_relief (GtkButton *button,
GtkReliefStyle relief)
{
GtkStyleContext *context;
GtkReliefStyle old_relief;
g_return_if_fail (GTK_IS_BUTTON (button));
old_relief = gtk_button_get_relief (button);
if (old_relief != relief)
{
context = gtk_widget_get_style_context (GTK_WIDGET (button));
if (relief == GTK_RELIEF_NONE)
gtk_style_context_add_class (context, GTK_STYLE_CLASS_FLAT);
else
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_FLAT);
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_RELIEF]);
}
}
/**
* gtk_button_get_relief:
* @button: The #GtkButton you want the #GtkReliefStyle from.
*
* Returns the current relief style of the given #GtkButton.
*
* Returns: The current #GtkReliefStyle
*/
GtkReliefStyle
gtk_button_get_relief (GtkButton *button)
{
GtkStyleContext *context;
g_return_val_if_fail (GTK_IS_BUTTON (button), GTK_RELIEF_NORMAL);
context = gtk_widget_get_style_context (GTK_WIDGET (button));
if (gtk_style_context_has_class (context, GTK_STYLE_CLASS_FLAT))
return GTK_RELIEF_NONE;
else
return GTK_RELIEF_NORMAL;
}
static void
gtk_button_realize (GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
GtkAllocation allocation;
GdkWindow *window;
gtk_widget_get_allocation (widget, &allocation);
gtk_widget_set_realized (widget, TRUE);
window = gtk_widget_get_parent_window (widget);
gtk_widget_set_window (widget, window);
g_object_ref (window);
priv->event_window = gdk_window_new_input (window,
gtk_widget_get_events (widget)
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_TOUCH_MASK
| GDK_ENTER_NOTIFY_MASK
| GDK_LEAVE_NOTIFY_MASK,
&allocation);
gtk_widget_register_window (widget, priv->event_window);
}
static void
gtk_button_unrealize (GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if (priv->activate_timeout)
gtk_button_finish_activate (button, FALSE);
if (priv->event_window)
{
gtk_widget_unregister_window (widget, priv->event_window);
gdk_window_destroy (priv->event_window);
priv->event_window = NULL;
}
GTK_WIDGET_CLASS (gtk_button_parent_class)->unrealize (widget);
}
static void
gtk_button_map (GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
GTK_WIDGET_CLASS (gtk_button_parent_class)->map (widget);
if (priv->event_window)
gdk_window_show (priv->event_window);
}
static void
gtk_button_unmap (GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if (priv->event_window)
{
gdk_window_hide (priv->event_window);
priv->in_button = FALSE;
}
GTK_WIDGET_CLASS (gtk_button_parent_class)->unmap (widget);
}
static void
gtk_button_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
GtkAllocation clip;
gtk_widget_set_allocation (widget, allocation);
gtk_css_gadget_allocate (priv->gadget,
allocation,
gtk_widget_get_allocated_baseline (widget),
&clip);
gtk_widget_set_clip (widget, &clip);
}
static void
gtk_button_allocate (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer unused)
{
GtkWidget *widget;
GtkWidget *child;
widget = gtk_css_gadget_get_owner (gadget);
child = gtk_bin_get_child (GTK_BIN (widget));
if (child && gtk_widget_get_visible (child))
gtk_widget_size_allocate_with_baseline (child, (GtkAllocation *)allocation, baseline);
if (gtk_widget_get_realized (widget))
{
GtkAllocation border_allocation;
gtk_css_gadget_get_border_allocation (gadget, &border_allocation, NULL);
gdk_window_move_resize (GTK_BUTTON (widget)->priv->event_window,
border_allocation.x,
border_allocation.y,
border_allocation.width,
border_allocation.height);
}
gtk_container_get_children_clip (GTK_CONTAINER (widget), out_clip);
}
static GskRenderNode *
gtk_button_get_render_node (GtkWidget *widget,
GskRenderer *renderer)
{
GskRenderNode *res = gtk_css_gadget_get_render_node (GTK_BUTTON (widget)->priv->gadget,
renderer,
gtk_widget_has_visible_focus (widget));
if (res == NULL)
return NULL;
gtk_container_propagate_render_node (GTK_CONTAINER (widget), renderer, res);
return res;
}
static void
gtk_button_do_release (GtkButton *button,
gboolean emit_clicked)
{
GtkButtonPrivate *priv = button->priv;
if (priv->button_down)
{
priv->button_down = FALSE;
if (priv->activate_timeout)
return;
if (emit_clicked)
gtk_button_clicked (button);
gtk_button_update_state (button);
}
}
static gboolean
gtk_button_grab_broken (GtkWidget *widget,
GdkEventGrabBroken *event)
{
GtkButton *button = GTK_BUTTON (widget);
gtk_button_do_release (button, FALSE);
return TRUE;
}
static gboolean
gtk_button_key_release (GtkWidget *widget,
GdkEventKey *event)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if (priv->activate_timeout)
{
gtk_button_finish_activate (button, TRUE);
return TRUE;
}
else if (GTK_WIDGET_CLASS (gtk_button_parent_class)->key_release_event)
return GTK_WIDGET_CLASS (gtk_button_parent_class)->key_release_event (widget, event);
else
return FALSE;
}
static gboolean
gtk_button_enter_notify (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if ((event->window == button->priv->event_window) &&
(event->detail != GDK_NOTIFY_INFERIOR))
{
priv->in_button = TRUE;
gtk_button_update_state (button);
}
return FALSE;
}
static gboolean
gtk_button_leave_notify (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if ((event->window == button->priv->event_window) &&
(event->detail != GDK_NOTIFY_INFERIOR))
{
priv->in_button = FALSE;
gtk_button_update_state (button);
}
return FALSE;
}
static void
gtk_real_button_clicked (GtkButton *button)
{
GtkButtonPrivate *priv = button->priv;
if (priv->action_helper)
gtk_action_helper_activate (priv->action_helper);
}
static gboolean
button_activate_timeout (gpointer data)
{
gtk_button_finish_activate (data, TRUE);
return FALSE;
}
static void
gtk_real_button_activate (GtkButton *button)
{
GtkWidget *widget = GTK_WIDGET (button);
GtkButtonPrivate *priv = button->priv;
GdkDevice *device;
device = gtk_get_current_event_device ();
if (device && gdk_device_get_source (device) != GDK_SOURCE_KEYBOARD)
device = gdk_device_get_associated_device (device);
if (gtk_widget_get_realized (widget) && !priv->activate_timeout)
{
/* bgo#626336 - Only grab if we have a device (from an event), not if we
* were activated programmatically when no event is available.
*/
if (device && gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
{
if (gdk_seat_grab (gdk_device_get_seat (device), priv->event_window,
GDK_SEAT_CAPABILITY_KEYBOARD, TRUE,
NULL, NULL, NULL, NULL) == GDK_GRAB_SUCCESS)
{
gtk_device_grab_add (widget, device, TRUE);
priv->grab_keyboard = device;
}
}
priv->activate_timeout = gdk_threads_add_timeout (ACTIVATE_TIMEOUT,
button_activate_timeout,
button);
g_source_set_name_by_id (priv->activate_timeout, "[gtk+] button_activate_timeout");
priv->button_down = TRUE;
gtk_button_update_state (button);
}
}
static void
gtk_button_finish_activate (GtkButton *button,
gboolean do_it)
{
GtkWidget *widget = GTK_WIDGET (button);
GtkButtonPrivate *priv = button->priv;
g_source_remove (priv->activate_timeout);
priv->activate_timeout = 0;
if (priv->grab_keyboard)
{
gdk_seat_ungrab (gdk_device_get_seat (priv->grab_keyboard));
gtk_device_grab_remove (widget, priv->grab_keyboard);
priv->grab_keyboard = NULL;
}
priv->button_down = FALSE;
gtk_button_update_state (button);
if (do_it)
gtk_button_clicked (button);
}
static void
gtk_button_measure (GtkCssGadget *gadget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline,
gpointer data)
{
GtkWidget *widget;
GtkWidget *child;
widget = gtk_css_gadget_get_owner (gadget);
child = gtk_bin_get_child (GTK_BIN (widget));
if (child && gtk_widget_get_visible (child))
{
gtk_widget_measure (child,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
else
{
*minimum = 0;
*natural = 0;
if (minimum_baseline)
*minimum_baseline = 0;
if (natural_baseline)
*natural_baseline = 0;
}
}
static void
gtk_button_measure_ (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
gtk_css_gadget_get_preferred_size (GTK_BUTTON (widget)->priv->gadget,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
/**
* gtk_button_set_label:
* @button: a #GtkButton
* @label: a string
*
* Sets the text of the label of the button to @label.
*
* This will also clear any previously set labels.
*/
void
gtk_button_set_label (GtkButton *button,
const gchar *label)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
GtkWidget *child;
GtkStyleContext *context;
g_return_if_fail (GTK_IS_BUTTON (button));
context = gtk_widget_get_style_context (GTK_WIDGET (button));
child = gtk_bin_get_child (GTK_BIN (button));
if (priv->child_type != LABEL_CHILD || child == NULL)
{
if (child != NULL)
gtk_container_remove (GTK_CONTAINER (button), child);
child = gtk_label_new (NULL);
if (priv->use_underline)
{
gtk_label_set_use_underline (GTK_LABEL (child), priv->use_underline);
gtk_label_set_mnemonic_widget (GTK_LABEL (child), GTK_WIDGET (button));
}
gtk_widget_show (child);
gtk_container_add (GTK_CONTAINER (button), child);
gtk_style_context_remove_class (context, "image-button");
gtk_style_context_add_class (context, "text-button");
}
gtk_label_set_label (GTK_LABEL (child), label);
gtk_button_set_child_type (button, LABEL_CHILD);
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_LABEL]);
}
/**
* gtk_button_get_label:
* @button: a #GtkButton
*
* Fetches the text from the label of the button, as set by
* gtk_button_set_label(). If the label text has not
* been set the return value will be %NULL. This will be the
* case if you create an empty button with gtk_button_new() to
* use as a container.
*
* Returns: (nullable): The text of the label widget. This string is owned
* by the widget and must not be modified or freed.
*/
const gchar *
gtk_button_get_label (GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_BUTTON (button), NULL);
if (priv->child_type == LABEL_CHILD)
{
GtkWidget *child = gtk_bin_get_child (GTK_BIN (button));
return gtk_label_get_label (GTK_LABEL (child));
}
return NULL;
}
/**
* gtk_button_set_use_underline:
* @button: a #GtkButton
* @use_underline: %TRUE if underlines in the text indicate mnemonics
*
* If true, an underline in the text of the button label indicates
* the next character should be used for the mnemonic accelerator key.
*/
void
gtk_button_set_use_underline (GtkButton *button,
gboolean use_underline)
{
GtkButtonPrivate *priv;
g_return_if_fail (GTK_IS_BUTTON (button));
priv = button->priv;
use_underline = use_underline != FALSE;
if (use_underline != priv->use_underline)
{
if (priv->child_type == LABEL_CHILD)
{
GtkWidget *child;
child = gtk_bin_get_child (GTK_BIN (button));
gtk_label_set_use_underline (GTK_LABEL (child), use_underline);
gtk_label_set_mnemonic_widget (GTK_LABEL (child), GTK_WIDGET (button));
}
priv->use_underline = use_underline;
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_USE_UNDERLINE]);
}
}
/**
* gtk_button_get_use_underline:
* @button: a #GtkButton
*
* Returns whether an embedded underline in the button label indicates a
* mnemonic. See gtk_button_set_use_underline ().
*
* Returns: %TRUE if an embedded underline in the button label
* indicates the mnemonic accelerator keys.
*/
gboolean
gtk_button_get_use_underline (GtkButton *button)
{
g_return_val_if_fail (GTK_IS_BUTTON (button), FALSE);
return button->priv->use_underline;
}
static void
gtk_button_update_state (GtkButton *button)
{
GtkButtonPrivate *priv = button->priv;
GtkStateFlags new_state;
gboolean depressed;
if (priv->activate_timeout)
depressed = TRUE;
else
depressed = priv->in_button && priv->button_down;
new_state = gtk_widget_get_state_flags (GTK_WIDGET (button)) &
~(GTK_STATE_FLAG_PRELIGHT | GTK_STATE_FLAG_ACTIVE);
if (priv->in_button)
new_state |= GTK_STATE_FLAG_PRELIGHT;
if (depressed)
new_state |= GTK_STATE_FLAG_ACTIVE;
gtk_widget_set_state_flags (GTK_WIDGET (button), new_state, TRUE);
}
static void
gtk_button_screen_changed (GtkWidget *widget,
GdkScreen *previous_screen)
{
GtkButton *button;
GtkButtonPrivate *priv;
if (!gtk_widget_has_screen (widget))
return;
button = GTK_BUTTON (widget);
priv = button->priv;
/* If the button is being pressed while the screen changes the
release might never occur, so we reset the state. */
if (priv->button_down)
{
priv->button_down = FALSE;
gtk_button_update_state (button);
}
}
static void
gtk_button_state_changed (GtkWidget *widget,
GtkStateType previous_state)
{
GtkButton *button = GTK_BUTTON (widget);
if (!gtk_widget_is_sensitive (widget))
gtk_button_do_release (button, FALSE);
}
static void
gtk_button_grab_notify (GtkWidget *widget,
gboolean was_grabbed)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = button->priv;
if (priv->activate_timeout &&
priv->grab_keyboard &&
gtk_widget_device_is_shadowed (widget, priv->grab_keyboard))
gtk_button_finish_activate (button, FALSE);
if (!was_grabbed)
gtk_button_do_release (button, FALSE);
}
/**
* gtk_button_get_event_window:
* @button: a #GtkButton
*
* Returns the button’s event window if it is realized, %NULL otherwise.
* This function should be rarely needed.
*
* Returns: (transfer none): @button’s event window.
*
* Since: 2.22
*/
GdkWindow*
gtk_button_get_event_window (GtkButton *button)
{
g_return_val_if_fail (GTK_IS_BUTTON (button), NULL);
return button->priv->event_window;
}
/**
* gtk_button_set_icon_name:
* @button: A #GtkButton
* @icon_name: A icon name
*
* Adds a #GtkImage with the given icon name as a child. The icon will be
* of size %GTK_ICON_SIZE_BUTTON. If @button already contains a child widget,
* that child widget will be removed and replaced with the image.
*/
void
gtk_button_set_icon_name (GtkButton *button,
const char *icon_name)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
GtkWidget *child;
GtkStyleContext *context;
g_return_if_fail (GTK_IS_BUTTON (button));
g_return_if_fail (icon_name != NULL);
child = gtk_bin_get_child (GTK_BIN (button));
context = gtk_widget_get_style_context (GTK_WIDGET (button));
if (priv->child_type != ICON_CHILD || child == NULL)
{
if (child != NULL)
gtk_container_remove (GTK_CONTAINER (button), child);
child = gtk_image_new_from_icon_name (icon_name, GTK_ICON_SIZE_BUTTON);
gtk_widget_show (child);
gtk_container_add (GTK_CONTAINER (button), child);
gtk_style_context_remove_class (context, "text-button");
gtk_style_context_add_class (context, "image-button");
}
else
{
gtk_image_set_from_icon_name (GTK_IMAGE (child), icon_name, GTK_ICON_SIZE_BUTTON);
}
gtk_button_set_child_type (button, ICON_CHILD);
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_ICON_NAME]);
}
/**
* gtk_button_get_icon_name:
* @button: A #GtkButton
*
* Returns: (nullable): The icon name set via gtk_button_set_icon_name
*/
const char *
gtk_button_get_icon_name (GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_BUTTON (button), NULL);
if (priv->child_type == ICON_CHILD)
{
const char *icon_name;
GtkWidget *child = gtk_bin_get_child (GTK_BIN (button));
gtk_image_get_icon_name (GTK_IMAGE (child), &icon_name, NULL);
return icon_name;
}
return NULL;
}
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