336 lines
10 KiB
C
336 lines
10 KiB
C
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/* GTK - The GIMP Toolkit
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* Copyright (C) 2017, 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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* GtkEventControllerMotion:
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*
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* `GtkEventControllerMotion` is an event controller tracking the pointer
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* position.
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*
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* The event controller offers [signal@Gtk.EventControllerMotion::enter]
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* and [signal@Gtk.EventControllerMotion::leave] signals, as well as
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* [property@Gtk.EventControllerMotion:is-pointer] and
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* [property@Gtk.EventControllerMotion:contains-pointer] properties
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* which are updated to reflect changes in the pointer position as it
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* moves over the widget.
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*/
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#include "config.h"
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#include "gtkprivate.h"
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#include "gtkwidgetprivate.h"
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#include "gtkmarshalers.h"
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#include "gtkeventcontrollerprivate.h"
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#include "gtkeventcontrollermotion.h"
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#include "gtktypebuiltins.h"
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#include "gtkmarshalers.h"
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struct _GtkEventControllerMotion
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{
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GtkEventController parent_instance;
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guint is_pointer : 1;
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guint contains_pointer : 1;
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};
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struct _GtkEventControllerMotionClass
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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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MOTION,
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N_SIGNALS
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};
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enum {
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PROP_IS_POINTER = 1,
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PROP_CONTAINS_POINTER,
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NUM_PROPERTIES
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};
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static GParamSpec *props[NUM_PROPERTIES] = { NULL, };
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static guint signals[N_SIGNALS] = { 0 };
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G_DEFINE_TYPE (GtkEventControllerMotion, gtk_event_controller_motion, GTK_TYPE_EVENT_CONTROLLER)
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static gboolean
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gtk_event_controller_motion_handle_event (GtkEventController *controller,
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GdkEvent *event,
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double x,
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double y)
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{
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GtkEventControllerClass *parent_class;
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GdkEventType type;
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type = gdk_event_get_event_type (event);
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if (type == GDK_MOTION_NOTIFY)
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g_signal_emit (controller, signals[MOTION], 0, x, y);
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parent_class = GTK_EVENT_CONTROLLER_CLASS (gtk_event_controller_motion_parent_class);
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return parent_class->handle_event (controller, event, x, y);
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}
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static void
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update_pointer_focus (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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GtkEventControllerMotion *motion = GTK_EVENT_CONTROLLER_MOTION (controller);
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GtkWidget *widget = gtk_event_controller_get_widget (controller);
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gboolean is_pointer = FALSE;
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gboolean contains_pointer = 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_pointer = TRUE;
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}
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if (crossing->new_target == widget)
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{
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contains_pointer = TRUE;
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is_pointer = 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_pointer = TRUE;
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is_pointer = FALSE;
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}
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if (motion->contains_pointer != contains_pointer)
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{
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enter = contains_pointer;
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leave = !contains_pointer;
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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 (motion));
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if (motion->is_pointer != is_pointer)
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{
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motion->is_pointer = is_pointer;
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g_object_notify_by_pspec (G_OBJECT (motion), props[PROP_IS_POINTER]);
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}
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if (motion->contains_pointer != contains_pointer)
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{
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motion->contains_pointer = contains_pointer;
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g_object_notify_by_pspec (G_OBJECT (motion), props[PROP_CONTAINS_POINTER]);
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}
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g_object_thaw_notify (G_OBJECT (motion));
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if (enter)
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g_signal_emit (controller, signals[ENTER], 0, x, y);
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}
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static void
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gtk_event_controller_motion_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_POINTER)
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update_pointer_focus (controller, crossing, x, y);
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}
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static void
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gtk_event_controller_motion_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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GtkEventControllerMotion *controller = GTK_EVENT_CONTROLLER_MOTION (object);
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switch (prop_id)
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{
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case PROP_IS_POINTER:
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g_value_set_boolean (value, controller->is_pointer);
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break;
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case PROP_CONTAINS_POINTER:
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g_value_set_boolean (value, controller->contains_pointer);
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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_motion_class_init (GtkEventControllerMotionClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkEventControllerClass *controller_class = GTK_EVENT_CONTROLLER_CLASS (klass);
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object_class->get_property = gtk_event_controller_motion_get_property;
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controller_class->handle_event = gtk_event_controller_motion_handle_event;
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controller_class->handle_crossing = gtk_event_controller_motion_handle_crossing;
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/**
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* GtkEventControllerMotion:is-pointer: (attributes org.gtk.Property.get=gtk_event_controller_motion_is_pointer)
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*
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* Whether the pointer 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.EventControllerMotion:contains-pointer].
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*
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* When handling crossing events, this property is updated
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* before [signal@Gtk.EventControllerMotion::enter], but after
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* [signal@Gtk.EventControllerMotion::leave] is emitted.
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*/
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props[PROP_IS_POINTER] =
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g_param_spec_boolean ("is-pointer", NULL, NULL,
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FALSE,
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G_PARAM_READABLE);
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/**
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* GtkEventControllerMotion:contains-pointer: (attributes org.gtk.Property.get=gtk_event_controller_motion_contains_pointer)
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*
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* Whether the pointer is in the controllers widget or a descendant.
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*
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* See also [property@Gtk.EventControllerMotion:is-pointer].
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*
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* When handling crossing events, this property is updated
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* before [signal@Gtk.EventControllerMotion::enter], but after
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* [signal@Gtk.EventControllerMotion::leave] is emitted.
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*/
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props[PROP_CONTAINS_POINTER] =
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g_param_spec_boolean ("contains-pointer", 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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* GtkEventControllerMotion::enter:
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* @controller: the object which received the signal
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* @x: coordinates of pointer location
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* @y: coordinates of pointer location
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*
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* Signals that the pointer has entered the widget.
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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_MOTION,
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G_SIGNAL_RUN_LAST,
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0, NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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G_TYPE_NONE, 2,
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G_TYPE_DOUBLE,
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G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[ENTER],
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G_TYPE_FROM_CLASS (klass),
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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/**
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* GtkEventControllerMotion::leave:
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* @controller: the object which received the signal
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*
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* Signals that the pointer has left the widget.
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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_MOTION,
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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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* GtkEventControllerMotion::motion:
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* @controller: The object that received the signal
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* @x: the x coordinate
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* @y: the y coordinate
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*
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* Emitted when the pointer moves inside the widget.
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*/
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signals[MOTION] =
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g_signal_new (I_("motion"),
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GTK_TYPE_EVENT_CONTROLLER_MOTION,
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G_SIGNAL_RUN_FIRST,
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0, NULL, NULL,
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_gtk_marshal_VOID__DOUBLE_DOUBLE,
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G_TYPE_NONE, 2, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[MOTION],
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GTK_TYPE_EVENT_CONTROLLER_MOTION,
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_gtk_marshal_VOID__DOUBLE_DOUBLEv);
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}
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static void
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gtk_event_controller_motion_init (GtkEventControllerMotion *motion)
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{
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}
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/**
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* gtk_event_controller_motion_new:
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*
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* Creates a new event controller that will handle motion events.
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*
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* Returns: a new `GtkEventControllerMotion`
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**/
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GtkEventController *
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gtk_event_controller_motion_new (void)
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{
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return g_object_new (GTK_TYPE_EVENT_CONTROLLER_MOTION,
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NULL);
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}
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/**
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* gtk_event_controller_motion_contains_pointer: (attributes org.gtk.Method.get_property=contains-pointer)
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* @self: a `GtkEventControllerMotion`
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*
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* Returns if a pointer is within @self or one of its children.
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*
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* Returns: %TRUE if a pointer is within @self or one of its children
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*/
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gboolean
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gtk_event_controller_motion_contains_pointer (GtkEventControllerMotion *self)
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{
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g_return_val_if_fail (GTK_IS_EVENT_CONTROLLER_MOTION (self), FALSE);
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return self->contains_pointer;
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}
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/**
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* gtk_event_controller_motion_is_pointer: (attributes org.gtk.Method.get_property=is-pointer)
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* @self: a `GtkEventControllerMotion`
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*
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* Returns if a pointer is within @self, but not one of its children.
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*
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* Returns: %TRUE if a pointer 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_motion_is_pointer (GtkEventControllerMotion *self)
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{
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g_return_val_if_fail (GTK_IS_EVENT_CONTROLLER_MOTION (self), FALSE);
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return self->is_pointer;
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}
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