forked from AuroraMiddleware/gtk
320 lines
9.4 KiB
C
320 lines
9.4 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2020, Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Author(s): Matthias Clasen <mclasen@redhat.com>
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*/
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/**
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* GtkEventControllerFocus:
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*
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* `GtkEventControllerFocus` is an event controller to keep track of
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* keyboard focus.
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*
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* The event controller offers [signal@Gtk.EventControllerFocus::enter]
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* and [signal@Gtk.EventControllerFocus::leave] signals, as well as
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* [property@Gtk.EventControllerFocus:is-focus] and
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* [property@Gtk.EventControllerFocus:contains-focus] properties
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* which are updated to reflect focus changes inside the widget hierarchy
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* that is rooted at the controllers widget.
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*/
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#include "config.h"
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#include "gtkmarshalers.h"
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#include "gtkprivate.h"
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#include "gtkwidgetprivate.h"
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#include "gtkeventcontrollerprivate.h"
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#include "gtkeventcontrollerfocus.h"
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#include "gtkenums.h"
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#include "gtkmain.h"
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#include "gtktypebuiltins.h"
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#include <gdk/gdk.h>
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struct _GtkEventControllerFocus
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{
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GtkEventController parent_instance;
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guint is_focus : 1;
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guint contains_focus : 1;
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};
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struct _GtkEventControllerFocusClass
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{
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GtkEventControllerClass parent_class;
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};
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enum {
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ENTER,
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LEAVE,
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N_SIGNALS
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};
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static guint signals[N_SIGNALS] = { 0 };
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enum {
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PROP_IS_FOCUS = 1,
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PROP_CONTAINS_FOCUS,
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NUM_PROPERTIES
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};
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static GParamSpec *props[NUM_PROPERTIES] = { NULL, };
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G_DEFINE_TYPE (GtkEventControllerFocus, gtk_event_controller_focus,
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GTK_TYPE_EVENT_CONTROLLER)
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static void
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gtk_event_controller_focus_finalize (GObject *object)
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{
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//GtkEventControllerFocus *focus = GTK_EVENT_CONTROLLER_FOCUS (object);
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G_OBJECT_CLASS (gtk_event_controller_focus_parent_class)->finalize (object);
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}
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static void
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update_focus (GtkEventController *controller,
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const GtkCrossingData *crossing)
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{
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GtkEventControllerFocus *focus = GTK_EVENT_CONTROLLER_FOCUS (controller);
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GtkWidget *widget = gtk_event_controller_get_widget (controller);
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gboolean is_focus = FALSE;
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gboolean contains_focus = FALSE;
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gboolean enter = FALSE;
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gboolean leave = FALSE;
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if (crossing->direction == GTK_CROSSING_IN)
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{
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if (crossing->new_descendent != NULL)
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{
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contains_focus = TRUE;
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}
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if (crossing->new_target == widget)
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{
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contains_focus = TRUE;
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is_focus = TRUE;
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}
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}
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else
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{
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if (crossing->new_descendent != NULL ||
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crossing->new_target == widget)
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contains_focus = TRUE;
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is_focus = FALSE;
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}
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if (focus->contains_focus != contains_focus)
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{
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enter = contains_focus;
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leave = !contains_focus;
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}
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if (leave)
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g_signal_emit (controller, signals[LEAVE], 0);
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g_object_freeze_notify (G_OBJECT (focus));
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if (focus->is_focus != is_focus)
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{
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focus->is_focus = is_focus;
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g_object_notify (G_OBJECT (focus), "is-focus");
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}
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if (focus->contains_focus != contains_focus)
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{
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focus->contains_focus = contains_focus;
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g_object_notify (G_OBJECT (focus), "contains-focus");
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}
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g_object_thaw_notify (G_OBJECT (focus));
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if (enter)
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g_signal_emit (controller, signals[ENTER], 0);
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}
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static void
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gtk_event_controller_focus_handle_crossing (GtkEventController *controller,
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const GtkCrossingData *crossing,
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double x,
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double y)
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{
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if (crossing->type == GTK_CROSSING_FOCUS ||
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crossing->type == GTK_CROSSING_ACTIVE)
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update_focus (controller, crossing);
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}
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static void
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gtk_event_controller_focus_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkEventControllerFocus *controller = GTK_EVENT_CONTROLLER_FOCUS (object);
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switch (prop_id)
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{
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case PROP_IS_FOCUS:
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g_value_set_boolean (value, controller->is_focus);
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break;
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case PROP_CONTAINS_FOCUS:
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g_value_set_boolean (value, controller->contains_focus);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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gtk_event_controller_focus_class_init (GtkEventControllerFocusClass *klass)
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{
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GtkEventControllerClass *controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->finalize = gtk_event_controller_focus_finalize;
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object_class->get_property = gtk_event_controller_focus_get_property;
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controller_class->handle_crossing = gtk_event_controller_focus_handle_crossing;
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/**
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* GtkEventControllerFocus:is-focus: (attributes org.gtk.Property.get=gtk_event_controller_focus_is_focus)
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*
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* %TRUE if focus is in the controllers widget itself,
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* as opposed to in a descendent widget.
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*
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* See also [property@Gtk.EventControllerFocus:contains-focus].
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*
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* When handling focus events, this property is updated
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* before [signal@Gtk.EventControllerFocus::enter] or
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* [signal@Gtk.EventControllerFocus::leave] are emitted.
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*/
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props[PROP_IS_FOCUS] =
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g_param_spec_boolean ("is-focus", NULL, NULL,
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FALSE,
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G_PARAM_READABLE);
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/**
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* GtkEventControllerFocus:contains-focus: (attributes org.gtk.Property.get=gtk_event_controller_focus_contains_focus)
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*
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* %TRUE if focus is contained in the controllers widget.
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*
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* See [property@Gtk.EventControllerFocus:is-focus] for whether
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* the focus is in the widget itself or inside a descendent.
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*
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* When handling focus events, this property is updated
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* before [signal@Gtk.EventControllerFocus::enter] or
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* [signal@Gtk.EventControllerFocus::leave] are emitted.
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*/
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props[PROP_CONTAINS_FOCUS] =
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g_param_spec_boolean ("contains-focus", NULL, NULL,
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FALSE,
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G_PARAM_READABLE);
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g_object_class_install_properties (object_class, NUM_PROPERTIES, props);
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/**
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* GtkEventControllerFocus::enter:
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* @controller: the object which received the signal
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*
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* Emitted whenever the focus enters into the widget or one
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* of its descendents.
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*
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* Note that this means you may not get an ::enter signal
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* even though the widget becomes the focus location, in
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* certain cases (such as when the focus moves from a descendent
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* of the widget to the widget itself). If you are interested
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* in these cases, you can monitor the
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* [property@Gtk.EventControllerFocus:is-focus]
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* property for changes.
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*/
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signals[ENTER] =
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g_signal_new (I_("enter"),
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GTK_TYPE_EVENT_CONTROLLER_FOCUS,
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G_SIGNAL_RUN_LAST,
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0, NULL, NULL,
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NULL,
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G_TYPE_NONE, 0);
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/**
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* GtkEventControllerFocus::leave:
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* @controller: the object which received the signal
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*
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* Emitted whenever the focus leaves the widget hierarchy
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* that is rooted at the widget that the controller is attached to.
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*
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* Note that this means you may not get a ::leave signal
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* even though the focus moves away from the widget, in
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* certain cases (such as when the focus moves from the widget
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* to a descendent). If you are interested in these cases, you
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* can monitor the [property@Gtk.EventControllerFocus:is-focus]
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* property for changes.
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*/
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signals[LEAVE] =
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g_signal_new (I_("leave"),
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GTK_TYPE_EVENT_CONTROLLER_FOCUS,
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G_SIGNAL_RUN_LAST,
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0, NULL, NULL,
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NULL,
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G_TYPE_NONE, 0);
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}
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static void
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gtk_event_controller_focus_init (GtkEventControllerFocus *controller)
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{
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}
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/**
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* gtk_event_controller_focus_new:
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*
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* Creates a new event controller that will handle focus events.
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*
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* Returns: a new `GtkEventControllerFocus`
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**/
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GtkEventController *
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gtk_event_controller_focus_new (void)
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{
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return g_object_new (GTK_TYPE_EVENT_CONTROLLER_FOCUS, NULL);
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}
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/**
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* gtk_event_controller_focus_contains_focus: (attributes org.gtk.Method.get_property=contains-focus)
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* @self: a `GtkEventControllerFocus`
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*
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* Returns %TRUE if focus is within @self or one of its children.
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*
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* Returns: %TRUE if focus is within @self or one of its children
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*/
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gboolean
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gtk_event_controller_focus_contains_focus (GtkEventControllerFocus *self)
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{
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g_return_val_if_fail (GTK_IS_EVENT_CONTROLLER_FOCUS (self), FALSE);
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return self->contains_focus;
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}
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/**
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* gtk_event_controller_focus_is_focus: (attributes org.gtk.Method.get_property=is-focus)
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* @self: a `GtkEventControllerFocus`
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*
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* Returns %TRUE if focus is within @self, but not one of its children.
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*
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* Returns: %TRUE if focus is within @self, but not one of its children
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*/
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gboolean
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gtk_event_controller_focus_is_focus (GtkEventControllerFocus *self)
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{
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g_return_val_if_fail (GTK_IS_EVENT_CONTROLLER_FOCUS (self), FALSE);
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return self->is_focus;
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}
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