394 lines
12 KiB
C
394 lines
12 KiB
C
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/*
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* Copyright © 2020 Benjamin Otte
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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 2.1 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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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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/**
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* GtkDropControllerMotion:
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*
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* `GtkDropControllerMotion` is an event controller tracking
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* the pointer during Drag-and-Drop operations.
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*
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* It is modeled after [class@Gtk.EventControllerMotion] so if you
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* have used that, this should feel really familiar.
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*
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* This controller is not able to accept drops, use [class@Gtk.DropTarget]
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* for that purpose.
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*/
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#include "config.h"
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#include "gtkdropcontrollermotion.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 "gtktypebuiltins.h"
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#include "gtkmarshalers.h"
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struct _GtkDropControllerMotion
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{
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GtkEventController parent_instance;
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GdkDrop *drop;
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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 _GtkDropControllerMotionClass
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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_0,
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PROP_CONTAINS_POINTER,
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PROP_DROP,
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PROP_IS_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 (GtkDropControllerMotion, gtk_drop_controller_motion, GTK_TYPE_EVENT_CONTROLLER)
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static gboolean
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gtk_drop_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_DRAG_MOTION)
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g_signal_emit (controller, signals[MOTION], 0, x, y);
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parent_class = GTK_EVENT_CONTROLLER_CLASS (gtk_drop_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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GtkDropControllerMotion *self = GTK_DROP_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 (self->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 (self));
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if (self->is_pointer != is_pointer)
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{
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self->is_pointer = is_pointer;
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g_object_notify (G_OBJECT (self), "is-pointer");
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}
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if (self->contains_pointer != contains_pointer)
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{
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self->contains_pointer = contains_pointer;
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if (contains_pointer)
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self->drop = g_object_ref (crossing->drop);
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else
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g_clear_object (&self->drop);
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g_object_notify (G_OBJECT (self), "contains-pointer");
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g_object_notify (G_OBJECT (self), "drop");
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}
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g_object_thaw_notify (G_OBJECT (self));
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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_drop_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_DROP)
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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_drop_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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GtkDropControllerMotion *self = GTK_DROP_CONTROLLER_MOTION (object);
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switch (prop_id)
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{
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case PROP_CONTAINS_POINTER:
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g_value_set_boolean (value, self->contains_pointer);
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break;
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case PROP_DROP:
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g_value_set_object (value, self->drop);
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break;
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case PROP_IS_POINTER:
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g_value_set_boolean (value, self->is_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_drop_controller_motion_class_init (GtkDropControllerMotionClass *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_drop_controller_motion_get_property;
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controller_class->handle_event = gtk_drop_controller_motion_handle_event;
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controller_class->handle_crossing = gtk_drop_controller_motion_handle_crossing;
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/**
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* GtkDropControllerMotion:contains-pointer: (attributes org.gtk.Property.get=gtk_drop_controller_motion_contains_pointer)
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*
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* Whether the pointer of a Drag-and-Drop operation is in
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* the controller's widget or a descendant.
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*
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* See also [property@Gtk.DropControllerMotion: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.DropControllerMotion::enter], but after
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* [signal@Gtk.DropControllerMotion::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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/**
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* GtkDropControllerMotion:drop: (attributes org.gtk.Property.get=gtk_drop_controller_motion_get_drop)
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*
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* The ongoing drop operation over the controller's widget or
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* its descendant.
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*
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* If no drop operation is going on, this property returns %NULL.
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*
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* The event controller should not modify the @drop, but it might
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* want to query its properties.
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*
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* When handling crossing events, this property is updated
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* before [signal@Gtk.DropControllerMotion::enter], but after
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* [signal@Gtk.DropControllerMotion::leave] is emitted.
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*/
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props[PROP_DROP] =
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g_param_spec_object ("drop", NULL, NULL,
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GDK_TYPE_DROP,
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G_PARAM_READABLE);
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/**
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* GtkDropControllerMotion:is-pointer: (attributes org.gtk.Property.get=gtk_drop_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.DropControllerMotion: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.DropControllerMotion::enter], but after
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* [signal@Gtk.DropControllerMotion::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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g_object_class_install_properties (object_class, NUM_PROPERTIES, props);
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/**
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* GtkDropControllerMotion::enter:
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* @self: 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_DROP_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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* GtkDropControllerMotion::leave:
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* @self: 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_DROP_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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* GtkDropControllerMotion::motion:
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* @self: 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_DROP_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,
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G_TYPE_DOUBLE,
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G_TYPE_DOUBLE);
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g_signal_set_va_marshaller (signals[MOTION],
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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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static void
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gtk_drop_controller_motion_init (GtkDropControllerMotion *self)
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{
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}
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/**
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* gtk_drop_controller_motion_new:
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*
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* Creates a new event controller that will handle pointer motion
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* events during drag and drop.
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*
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* Returns: a new `GtkDropControllerMotion`
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**/
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GtkEventController *
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gtk_drop_controller_motion_new (void)
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{
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return g_object_new (GTK_TYPE_DROP_CONTROLLER_MOTION,
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NULL);
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}
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/**
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* gtk_drop_controller_motion_contains_pointer: (attributes org.gtk.Method.get_property=contains-pointer)
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* @self: a `GtkDropControllerMotion`
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*
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* Returns if a Drag-and-Drop operation is within the widget
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* @self or one of its children.
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*
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* Returns: %TRUE if a dragging pointer is within @self or one of its children.
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*/
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gboolean
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gtk_drop_controller_motion_contains_pointer (GtkDropControllerMotion *self)
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{
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g_return_val_if_fail (GTK_IS_DROP_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_drop_controller_motion_get_drop: (attributes org.gtk.Method.get_property=drop)
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* @self: a `GtkDropControllerMotion`
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*
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* Returns the `GdkDrop` of a current Drag-and-Drop operation
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* over the widget of @self.
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*
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* Returns: (transfer none) (nullable): The `GdkDrop` currently
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* happening within @self
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*/
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GdkDrop *
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gtk_drop_controller_motion_get_drop (GtkDropControllerMotion *self)
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{
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g_return_val_if_fail (GTK_IS_DROP_CONTROLLER_MOTION (self), FALSE);
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return self->drop;
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}
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/**
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* gtk_drop_controller_motion_is_pointer: (attributes org.gtk.Method.get_property=is-pointer)
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* @self: a `GtkDropControllerMotion`
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*
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* Returns if a Drag-and-Drop operation is within the widget
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* @self, not one of its children.
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*
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* Returns: %TRUE if a dragging pointer is within @self but
|
||
|
|
* not one of its children
|
||
|
|
*/
|
||
|
|
gboolean
|
||
|
|
gtk_drop_controller_motion_is_pointer (GtkDropControllerMotion *self)
|
||
|
|
{
|
||
|
|
g_return_val_if_fail (GTK_IS_DROP_CONTROLLER_MOTION (self), FALSE);
|
||
|
|
|
||
|
|
return self->is_pointer;
|
||
|
|
}
|