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gtk2/gtk/gtkbutton.c
Emmanuele Bassi e8b6e6cad0 docs: Clean up the first paragraph for various symbols 
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2021-03-11 16:37:30 +00:00

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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 #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 or #GtkFontButton use style classes such as
* .toggle, .popup, .scale, .lock, .color on the button node
* to differentiate themselves from a plain GtkButton.
*
* # Accessibility
*
* GtkButton uses the #GTK_ACCESSIBLE_ROLE_BUTTON role.
*/
#include "config.h"
#include "gtkbuttonprivate.h"
#include "gtkactionhelperprivate.h"
#include "gtkbuildable.h"
#include "gtkcheckbutton.h"
#include "gtkgestureclick.h"
#include "gtkeventcontrollerkey.h"
#include "gtkbinlayout.h"
#include "gtkimage.h"
#include "gtkintl.h"
#include "gtklabel.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkprivate.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include "gtkshortcuttrigger.h"
#include <string.h>
/* Time out before giving up on getting a key release when animating
* the close button.
*/
#define ACTIVATE_TIMEOUT 250
struct _GtkButtonPrivate
{
GtkWidget *child;
GtkActionHelper *action_helper;
GtkGesture *gesture;
guint activate_timeout;
guint button_down : 1;
guint use_underline : 1;
guint child_type : 2;
};
enum {
CLICKED,
ACTIVATE,
LAST_SIGNAL
};
enum {
PROP_0,
PROP_LABEL,
PROP_HAS_FRAME,
PROP_USE_UNDERLINE,
PROP_ICON_NAME,
PROP_CHILD,
/* actionable properties */
PROP_ACTION_NAME,
PROP_ACTION_TARGET,
LAST_PROP = PROP_ACTION_NAME
};
enum {
LABEL_CHILD,
ICON_CHILD,
WIDGET_CHILD
};
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_unrealize (GtkWidget * widget);
static void gtk_real_button_clicked (GtkButton * button);
static void gtk_real_button_activate (GtkButton *button);
static void gtk_button_finish_activate (GtkButton *button,
gboolean do_it);
static void gtk_button_state_flags_changed (GtkWidget *widget,
GtkStateFlags previous_state);
static void gtk_button_do_release (GtkButton *button,
gboolean emit_clicked);
static void gtk_button_set_child_type (GtkButton *button, guint child_type);
static void gtk_button_buildable_iface_init (GtkBuildableIface *iface);
static void gtk_button_actionable_iface_init (GtkActionableInterface *iface);
static GParamSpec *props[LAST_PROP] = { NULL, };
static guint button_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE_WITH_CODE (GtkButton, gtk_button, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkButton)
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_button_buildable_iface_init)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ACTIONABLE, gtk_button_actionable_iface_init))
static void
gtk_button_compute_expand (GtkWidget *widget,
gboolean *hexpand,
gboolean *vexpand)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (GTK_BUTTON (widget));
if (priv->child)
{
*hexpand = gtk_widget_compute_expand (priv->child, GTK_ORIENTATION_HORIZONTAL);
*vexpand = gtk_widget_compute_expand (priv->child, GTK_ORIENTATION_VERTICAL);
}
else
{
*hexpand = FALSE;
*vexpand = FALSE;
}
}
static GtkSizeRequestMode
gtk_button_get_request_mode (GtkWidget *widget)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (GTK_BUTTON (widget));
if (priv->child)
return gtk_widget_get_request_mode (priv->child);
else
return GTK_SIZE_REQUEST_CONSTANT_SIZE;
}
static void
gtk_button_class_init (GtkButtonClass *klass)
{
const guint activate_keyvals[] = { GDK_KEY_space, GDK_KEY_KP_Space, GDK_KEY_Return,
GDK_KEY_ISO_Enter, GDK_KEY_KP_Enter };
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
GtkShortcutAction *activate_action;
gobject_class = G_OBJECT_CLASS (klass);
widget_class = (GtkWidgetClass*) klass;
gobject_class->dispose = gtk_button_dispose;
gobject_class->set_property = gtk_button_set_property;
gobject_class->get_property = gtk_button_get_property;
widget_class->unrealize = gtk_button_unrealize;
widget_class->state_flags_changed = gtk_button_state_flags_changed;
widget_class->compute_expand = gtk_button_compute_expand;
widget_class->get_request_mode = gtk_button_get_request_mode;
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_HAS_FRAME] =
g_param_spec_boolean ("has-frame",
P_("Has Frame"),
P_("Whether the button has a frame"),
TRUE,
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);
props[PROP_CHILD] =
g_param_spec_object ("child",
P_("Child"),
P_("The child widget"),
GTK_TYPE_WIDGET,
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);
gtk_widget_class_set_activate_signal (widget_class, button_signals[ACTIVATE]);
activate_action = gtk_signal_action_new ("activate");
for (guint i = 0; i < G_N_ELEMENTS (activate_keyvals); i++)
{
GtkShortcut *activate_shortcut = gtk_shortcut_new (gtk_keyval_trigger_new (activate_keyvals[i], 0),
g_object_ref (activate_action));
gtk_widget_class_add_shortcut (widget_class, activate_shortcut);
g_object_unref (activate_shortcut);
}
g_object_unref (activate_action);
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_BUTTON);
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
gtk_widget_class_set_css_name (widget_class, I_("button"));
}
static void
click_pressed_cb (GtkGestureClick *gesture,
guint n_press,
double x,
double y,
GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (gtk_widget_get_focus_on_click (widget) && !gtk_widget_has_focus (widget))
gtk_widget_grab_focus (widget);
if (!priv->activate_timeout)
priv->button_down = TRUE;
}
static void
click_released_cb (GtkGestureClick *gesture,
guint n_press,
double x,
double y,
GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
gtk_button_do_release (button,
gtk_widget_is_sensitive (GTK_WIDGET (button)) &&
gtk_widget_contains (widget, x, y));
}
static void
click_gesture_cancel_cb (GtkGesture *gesture,
GdkEventSequence *sequence,
GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (priv->activate_timeout)
gtk_button_finish_activate (button, FALSE);
gtk_button_do_release (button, FALSE);
}
static gboolean
key_controller_key_pressed_cb (GtkEventControllerKey *controller,
guint keyval,
guint keycode,
guint modifiers,
GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
return priv->activate_timeout != 0;
}
static void
key_controller_key_released_cb (GtkEventControllerKey *controller,
guint keyval,
guint keycode,
guint modifiers,
GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (priv->activate_timeout)
gtk_button_finish_activate (button, TRUE);
}
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 = gtk_button_get_instance_private (button);
GtkEventController *key_controller;
gtk_widget_set_focusable (GTK_WIDGET (button), TRUE);
gtk_widget_set_receives_default (GTK_WIDGET (button), TRUE);
priv->button_down = FALSE;
priv->use_underline = FALSE;
priv->child_type = WIDGET_CHILD;
priv->gesture = gtk_gesture_click_new ();
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (priv->gesture), FALSE);
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (priv->gesture), GDK_BUTTON_PRIMARY);
g_signal_connect (priv->gesture, "pressed", G_CALLBACK (click_pressed_cb), button);
g_signal_connect (priv->gesture, "released", G_CALLBACK (click_released_cb), button);
g_signal_connect (priv->gesture, "cancel", G_CALLBACK (click_gesture_cancel_cb), button);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (priv->gesture), GTK_PHASE_CAPTURE);
gtk_widget_add_controller (GTK_WIDGET (button), GTK_EVENT_CONTROLLER (priv->gesture));
key_controller = gtk_event_controller_key_new ();
g_signal_connect (key_controller, "key-pressed", G_CALLBACK (key_controller_key_pressed_cb), button);
g_signal_connect (key_controller, "key-released", G_CALLBACK (key_controller_key_released_cb), button);
gtk_widget_add_controller (GTK_WIDGET (button), key_controller);
}
static void
gtk_button_dispose (GObject *object)
{
GtkButton *button = GTK_BUTTON (object);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_clear_pointer (&priv->child, gtk_widget_unparent);
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 char *action_name)
{
GtkButton *button = GTK_BUTTON (actionable);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (!priv->action_helper)
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 (priv->action_helper, action_name);
}
static void
gtk_button_set_action_target_value (GtkActionable *actionable,
GVariant *action_target)
{
GtkButton *button = GTK_BUTTON (actionable);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (!priv->action_helper)
priv->action_helper = gtk_action_helper_new (actionable);
gtk_action_helper_set_action_target_value (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_HAS_FRAME:
gtk_button_set_has_frame (button, g_value_get_boolean (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_CHILD:
gtk_button_set_child (button, g_value_get_object (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 = gtk_button_get_instance_private (button);
switch (prop_id)
{
case PROP_LABEL:
g_value_set_string (value, gtk_button_get_label (button));
break;
case PROP_HAS_FRAME:
g_value_set_boolean (value, gtk_button_get_has_frame (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_CHILD:
g_value_set_object (value, priv->child);
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 char *
gtk_button_get_action_name (GtkActionable *actionable)
{
GtkButton *button = GTK_BUTTON (actionable);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
return gtk_action_helper_get_action_name (priv->action_helper);
}
static GVariant *
gtk_button_get_action_target_value (GtkActionable *actionable)
{
GtkButton *button = GTK_BUTTON (actionable);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
return gtk_action_helper_get_action_target_value (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;
}
static GtkBuildableIface *parent_buildable_iface;
static void
gtk_button_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *type)
{
if (GTK_IS_WIDGET (child))
gtk_button_set_child (GTK_BUTTON (buildable), GTK_WIDGET (child));
else
parent_buildable_iface->add_child (buildable, builder, child, type);
}
static void
gtk_button_buildable_iface_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->add_child = gtk_button_buildable_add_child;
}
/**
* gtk_button_new:
*
* Creates a new #GtkButton widget. To add a child widget to the button,
* use gtk_button_set_child().
*
* 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 char *label)
{
return g_object_new (GTK_TYPE_BUTTON, "label", label, NULL);
}
/**
* gtk_button_new_from_icon_name:
* @icon_name: (nullable): an icon name or %NULL
*
* 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.
*
* Returns: a new #GtkButton displaying the themed icon
*/
GtkWidget*
gtk_button_new_from_icon_name (const char *icon_name)
{
GtkWidget *button;
button = g_object_new (GTK_TYPE_BUTTON,
"icon-name", icon_name,
NULL);
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 char *label)
{
return g_object_new (GTK_TYPE_BUTTON, "label", label, "use-underline", TRUE, NULL);
}
/**
* gtk_button_set_has_frame:
* @button: a #GtkButton
* @has_frame: whether the button should have a visible frame
*
* Sets the style of the button. Buttons can has a flat appearance
* or have a frame drawn around them.
*/
void
gtk_button_set_has_frame (GtkButton *button,
gboolean has_frame)
{
g_return_if_fail (GTK_IS_BUTTON (button));
if (gtk_button_get_has_frame (button) == has_frame)
return;
if (has_frame)
gtk_widget_remove_css_class (GTK_WIDGET (button), "flat");
else
gtk_widget_add_css_class (GTK_WIDGET (button), "flat");
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_HAS_FRAME]);
}
/**
* gtk_button_get_has_frame:
* @button: a #GtkButton
*
* Returns whether the button has a frame.
*
* Returns: %TRUE if the button has a frame
*/
gboolean
gtk_button_get_has_frame (GtkButton *button)
{
g_return_val_if_fail (GTK_IS_BUTTON (button), TRUE);
return !gtk_widget_has_css_class (GTK_WIDGET (button), "flat");
}
static void
gtk_button_unrealize (GtkWidget *widget)
{
GtkButton *button = GTK_BUTTON (widget);
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (priv->activate_timeout)
gtk_button_finish_activate (button, FALSE);
GTK_WIDGET_CLASS (gtk_button_parent_class)->unrealize (widget);
}
static void
gtk_button_do_release (GtkButton *button,
gboolean emit_clicked)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
if (priv->button_down)
{
priv->button_down = FALSE;
if (priv->activate_timeout)
return;
if (emit_clicked)
g_signal_emit (button, button_signals[CLICKED], 0);
}
}
static void
gtk_real_button_clicked (GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
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 = gtk_button_get_instance_private (button);
if (gtk_widget_get_realized (widget) && !priv->activate_timeout)
{
priv->activate_timeout = g_timeout_add (ACTIVATE_TIMEOUT, button_activate_timeout, button);
g_source_set_name_by_id (priv->activate_timeout, "[gtk] button_activate_timeout");
priv->button_down = TRUE;
}
}
static void
gtk_button_finish_activate (GtkButton *button,
gboolean do_it)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_source_remove (priv->activate_timeout);
priv->activate_timeout = 0;
priv->button_down = FALSE;
if (do_it)
g_signal_emit (button, button_signals[CLICKED], 0);
}
/**
* 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 char *label)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
GtkWidget *child;
g_return_if_fail (GTK_IS_BUTTON (button));
if (priv->child_type != LABEL_CHILD || priv->child == NULL)
{
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));
}
if (GTK_IS_CHECK_BUTTON (button))
gtk_label_set_xalign (GTK_LABEL (child), 0.0);
gtk_button_set_child (button, child);
gtk_widget_remove_css_class (GTK_WIDGET (button), "image-button");
gtk_widget_add_css_class (GTK_WIDGET (button), "text-button");
}
gtk_label_set_label (GTK_LABEL (priv->child), label);
gtk_button_set_child_type (button, LABEL_CHILD);
gtk_accessible_update_property (GTK_ACCESSIBLE (button),
GTK_ACCESSIBLE_PROPERTY_LABEL, label,
-1);
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 char *
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)
return gtk_label_get_label (GTK_LABEL (priv->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 = gtk_button_get_instance_private (button);
g_return_if_fail (GTK_IS_BUTTON (button));
use_underline = use_underline != FALSE;
if (use_underline != priv->use_underline)
{
if (priv->child_type == LABEL_CHILD)
{
gtk_label_set_use_underline (GTK_LABEL (priv->child), use_underline);
gtk_label_set_mnemonic_widget (GTK_LABEL (priv->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)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_BUTTON (button), FALSE);
return priv->use_underline;
}
static void
gtk_button_state_flags_changed (GtkWidget *widget,
GtkStateFlags previous_state)
{
GtkButton *button = GTK_BUTTON (widget);
if (!gtk_widget_is_sensitive (widget))
gtk_button_do_release (button, FALSE);
}
/**
* gtk_button_set_icon_name:
* @button: A #GtkButton
* @icon_name: An icon name
*
* Adds a #GtkImage with the given icon name as a child. 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);
g_return_if_fail (GTK_IS_BUTTON (button));
g_return_if_fail (icon_name != NULL);
if (priv->child_type != ICON_CHILD || priv->child == NULL)
{
GtkWidget *child = g_object_new (GTK_TYPE_IMAGE,
"accessible-role", GTK_ACCESSIBLE_ROLE_PRESENTATION,
"icon-name", icon_name,
NULL);
gtk_button_set_child (GTK_BUTTON (button), child);
gtk_widget_set_valign (child, GTK_ALIGN_CENTER);
gtk_widget_remove_css_class (GTK_WIDGET (button), "text-button");
gtk_widget_add_css_class (GTK_WIDGET (button), "image-button");
}
else
{
gtk_image_set_from_icon_name (GTK_IMAGE (priv->child), icon_name);
}
gtk_accessible_update_relation (GTK_ACCESSIBLE (button),
GTK_ACCESSIBLE_RELATION_LABELLED_BY, priv->child, NULL,
-1);
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 the icon name set via gtk_button_set_icon_name().
*
* 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)
return gtk_image_get_icon_name (GTK_IMAGE (priv->child));
return NULL;
}
GtkGesture *
gtk_button_get_gesture (GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
return priv->gesture;
}
/**
* gtk_button_set_child:
* @button: a #GtkButton
* @child: (allow-none): the child widget
*
* Sets the child widget of @button.
*/
void
gtk_button_set_child (GtkButton *button,
GtkWidget *child)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_return_if_fail (GTK_IS_BUTTON (button));
g_return_if_fail (child == NULL || GTK_IS_WIDGET (child));
g_clear_pointer (&priv->child, gtk_widget_unparent);
priv->child = child;
if (priv->child)
gtk_widget_set_parent (priv->child, GTK_WIDGET (button));
gtk_button_set_child_type (button, WIDGET_CHILD);
g_object_notify_by_pspec (G_OBJECT (button), props[PROP_CHILD]);
}
/**
* gtk_button_get_child:
* @button: a #GtkButton
*
* Gets the child widget of @button.
*
* Returns: (nullable) (transfer none): the child widget of @button
*/
GtkWidget *
gtk_button_get_child (GtkButton *button)
{
GtkButtonPrivate *priv = gtk_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_BUTTON (button), NULL);
return priv->child;
}
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