forked from AuroraMiddleware/gtk
a411959c91
This is a huge reorganization of GtkDropTarget. I did not know how to split this up, so it's unfortunately all one commit. Highlights: - Split GtkDropTarget into GtkDropTarget and GtkDropTargetAsync GtkDropTarget is the simple one that only works with GTypes and offers a synchronous interface. GtkDropTargetAsync retains the full old functionality and allows handling mime types. - Drop events are handled differently Instead of picking a single drop target and sending all DND events to it, every event is sent to every drop target. The first one to handle the event gets to call gdk_drop_status(), further handlers do not interact with the GdkDrop. Of course, for the ultimate GDK_DROP_STARTING event, only the first one to accept the drop gets to handle it. This allows stacking DND event controllers that aren't necessarily interested in handling the event or that might decide later to drop it. - Port all widgets to either of those Both have a somewhat changed API due to the new event handling. For the ones who should use the sync version, lots of cleanup was involved to operate on a sync API.
674 lines
22 KiB
C
674 lines
22 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
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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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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include "gtkdroptargetasync.h"
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#include "gtkdropprivate.h"
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#include "gtkeventcontrollerprivate.h"
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#include "gtkintl.h"
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#include "gtkmarshalers.h"
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#include "gtknative.h"
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#include "gtktypebuiltins.h"
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/**
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* SECTION:gtkdroptargetasync
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* @Short_description: Event controller to receive DND drops
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* @Title: GtkDropTargetAsync
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* @See_also: #GtkDropTarget
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*
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* GtkDropTargetAsync is an auxiliary object that can be used to receive
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* Drag-and-Drop operations.
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* It is the more complete but also more complex method of handling drop
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* operations compared to #GtkDropTarget and you should only use it if
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* #GtkDropTarget doesn't provide all the features you need.
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*
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* To use a #GtkDropTargetAsync to receive drops on a widget, you create
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* a #GtkDropTargetAsync object, configure which data formats and actions
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* you support, connect to its signals, and then attach
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* it to the widget with gtk_widget_add_controller().
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*
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* During a drag operation, the first signal that a GtkDropTargetAsync
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* emits is #GtkDropTargetAsync::accept, which is meant to determine
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* whether the target is a possible drop site for the ongoing drop.
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* The default handler for the ::accept signal accepts the drop
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* if it finds a compatible data format and an action that is supported
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* on both sides.
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*
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* If it is, and the widget becomes a target, you will receive a
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* #GtkDropTargetAsync::drag-enter signal, followed by
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* #GtkDropTargetAsync::drag-motion signals as the pointer moves,
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* optionally a #GtkDropTargetAsync::drop signal when a drop happens,
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* and finally a #GtkDropTargetAsync::drag-leave signal when the pointer
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* moves off the widget.
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*
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* The ::drag-enter and ::drag-motion handler return a #GdkDragAction
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* to update the status of the ongoing operation. The ::drop handler
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* should decide if it ultimately accepts the drop and if it does, it
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* should initiate the data transfer and finish the operation by calling
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* gdk_drop_finish().
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*
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* Between the ::drag-enter and ::drag-leave signals the widget is a
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* current drop target, and will receive the %GTK_STATE_FLAG_DROP_ACTIVE
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* state, which can be used by themes to style the widget as a drop target.
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*/
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struct _GtkDropTargetAsync
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{
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GtkEventController parent_object;
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GdkContentFormats *formats;
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GdkDragAction actions;
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GdkDrop *drop;
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gboolean rejected;
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};
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struct _GtkDropTargetAsyncClass
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{
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GtkEventControllerClass parent_class;
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gboolean (* accept) (GtkDropTargetAsync *self,
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GdkDrop *drop);
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GdkDragAction (* drag_enter) (GtkDropTargetAsync *self,
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GdkDrop *drop,
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double x,
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double y);
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GdkDragAction (* drag_motion) (GtkDropTargetAsync *self,
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GdkDrop *drop,
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double x,
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double y);
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void (* drag_leave) (GtkDropTargetAsync *self,
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GdkDrop *drop);
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gboolean (* drop) (GtkDropTargetAsync *self,
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GdkDrop *drop,
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double x,
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double y);
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};
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enum {
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PROP_0,
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PROP_ACTIONS,
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PROP_FORMATS,
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NUM_PROPERTIES
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};
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static GParamSpec *properties[NUM_PROPERTIES];
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enum {
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ACCEPT,
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DRAG_ENTER,
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DRAG_MOTION,
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DRAG_LEAVE,
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DROP,
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NUM_SIGNALS
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};
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static guint signals[NUM_SIGNALS];
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G_DEFINE_TYPE (GtkDropTargetAsync, gtk_drop_target_async, GTK_TYPE_EVENT_CONTROLLER);
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static gboolean
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gtk_drop_target_async_accept (GtkDropTargetAsync *self,
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GdkDrop *drop)
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{
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if ((gdk_drop_get_actions (drop) & self->actions) == 0)
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return FALSE;
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if (self->formats == NULL)
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return TRUE;
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return gdk_content_formats_match (self->formats, gdk_drop_get_formats (drop));
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}
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static GdkDragAction
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make_action_unique (GdkDragAction actions)
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{
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if (actions & GDK_ACTION_COPY)
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return GDK_ACTION_COPY;
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if (actions & GDK_ACTION_MOVE)
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return GDK_ACTION_MOVE;
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if (actions & GDK_ACTION_LINK)
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return GDK_ACTION_LINK;
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return 0;
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}
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static GdkDragAction
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gtk_drop_target_async_drag_enter (GtkDropTargetAsync *self,
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GdkDrop *drop,
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double x,
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double y)
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{
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return make_action_unique (self->actions & gdk_drop_get_actions (drop));
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}
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static GdkDragAction
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gtk_drop_target_async_drag_motion (GtkDropTargetAsync *self,
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GdkDrop *drop,
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double x,
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double y)
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{
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return make_action_unique (self->actions & gdk_drop_get_actions (drop));
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}
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static gboolean
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gtk_drop_target_async_drop (GtkDropTargetAsync *self,
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GdkDrop *drop,
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double x,
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double y)
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{
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return FALSE;
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}
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static gboolean
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gtk_drop_target_async_filter_event (GtkEventController *controller,
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GdkEvent *event)
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{
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switch ((int)gdk_event_get_event_type (event))
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{
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case GDK_DRAG_ENTER:
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case GDK_DRAG_LEAVE:
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case GDK_DRAG_MOTION:
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case GDK_DROP_START:
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return GTK_EVENT_CONTROLLER_CLASS (gtk_drop_target_async_parent_class)->filter_event (controller, event);
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default:;
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}
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return TRUE;
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}
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static gboolean
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gtk_drop_target_async_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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GtkDropTargetAsync *self = GTK_DROP_TARGET_ASYNC (controller);
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GdkDrop *drop;
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switch ((int) gdk_event_get_event_type (event))
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{
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case GDK_DRAG_MOTION:
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{
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GtkWidget *widget = gtk_event_controller_get_widget (controller);
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GdkDragAction preferred_action;
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drop = gdk_drag_event_get_drop (event);
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/* sanity check */
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g_return_val_if_fail (self->drop == drop, FALSE);
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if (self->rejected)
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return FALSE;
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g_signal_emit (self, signals[DRAG_MOTION], 0, drop, x, y, &preferred_action);
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if (preferred_action &&
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gtk_drop_status (self->drop, self->actions, preferred_action))
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{
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gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_DROP_ACTIVE, FALSE);
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}
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else
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{
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gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_DROP_ACTIVE);
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}
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}
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return FALSE;
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case GDK_DROP_START:
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{
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gboolean handled;
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drop = gdk_drag_event_get_drop (event);
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/* sanity check */
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g_return_val_if_fail (self->drop == drop, FALSE);
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if (self->rejected)
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return FALSE;
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g_signal_emit (self, signals[DROP], 0, self->drop, x, y, &handled);
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return handled;
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}
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default:
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return FALSE;
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}
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}
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static void
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gtk_drop_target_async_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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GtkDropTargetAsync *self = GTK_DROP_TARGET_ASYNC (controller);
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GtkWidget *widget = gtk_event_controller_get_widget (controller);
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if (crossing->type != GTK_CROSSING_DROP)
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return;
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/* sanity check */
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g_warn_if_fail (self->drop == NULL || self->drop == crossing->drop);
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if (crossing->direction == GTK_CROSSING_IN)
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{
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gboolean accept = FALSE;
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GdkDragAction preferred_action;
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if (self->drop != NULL)
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return;
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self->drop = g_object_ref (crossing->drop);
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g_signal_emit (self, signals[ACCEPT], 0, self->drop, &accept);
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self->rejected = !accept;
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if (self->rejected)
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return;
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g_signal_emit (self, signals[DRAG_ENTER], 0, self->drop, x, y, &preferred_action);
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if (preferred_action &&
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gtk_drop_status (self->drop, self->actions, preferred_action))
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{
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gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_DROP_ACTIVE, FALSE);
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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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return;
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g_signal_emit (self, signals[DRAG_LEAVE], 0, self->drop);
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g_clear_object (&self->drop);
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gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_DROP_ACTIVE);
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}
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}
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static void
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gtk_drop_target_async_finalize (GObject *object)
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{
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GtkDropTargetAsync *self = GTK_DROP_TARGET_ASYNC (object);
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g_clear_pointer (&self->formats, gdk_content_formats_unref);
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G_OBJECT_CLASS (gtk_drop_target_async_parent_class)->finalize (object);
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}
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static void
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gtk_drop_target_async_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkDropTargetAsync *self = GTK_DROP_TARGET_ASYNC (object);
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switch (prop_id)
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{
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case PROP_ACTIONS:
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gtk_drop_target_async_set_actions (self, g_value_get_flags (value));
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break;
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case PROP_FORMATS:
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gtk_drop_target_async_set_formats (self, g_value_get_boxed (value));
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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_target_async_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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GtkDropTargetAsync *self = GTK_DROP_TARGET_ASYNC (object);
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switch (prop_id)
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{
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case PROP_ACTIONS:
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g_value_set_flags (value, gtk_drop_target_async_get_actions (self));
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break;
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case PROP_FORMATS:
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g_value_set_boxed (value, gtk_drop_target_async_get_formats (self));
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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_target_async_class_init (GtkDropTargetAsyncClass *class)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (class);
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GtkEventControllerClass *controller_class = GTK_EVENT_CONTROLLER_CLASS (class);
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object_class->finalize = gtk_drop_target_async_finalize;
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object_class->set_property = gtk_drop_target_async_set_property;
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object_class->get_property = gtk_drop_target_async_get_property;
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controller_class->handle_event = gtk_drop_target_async_handle_event;
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controller_class->filter_event = gtk_drop_target_async_filter_event;
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controller_class->handle_crossing = gtk_drop_target_async_handle_crossing;
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class->accept = gtk_drop_target_async_accept;
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class->drag_enter = gtk_drop_target_async_drag_enter;
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class->drag_motion = gtk_drop_target_async_drag_motion;
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class->drop = gtk_drop_target_async_drop;
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/**
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* GtkDropTargetAsync:actions:
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*
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* The #GdkDragActions that this drop target supports
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*/
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properties[PROP_ACTIONS] =
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g_param_spec_flags ("actions", P_("Actions"), P_("Actions"),
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GDK_TYPE_DRAG_ACTION, 0,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkDropTargetAsync:formats:
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*
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* The #GdkContentFormats that determines the supported data formats
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*/
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properties[PROP_FORMATS] =
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g_param_spec_boxed ("formats", P_("Formats"), P_("Formats"),
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GDK_TYPE_CONTENT_FORMATS,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY);
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g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
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/**
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* GtkWidget::accept:
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* @self: the #GtkDropTargetAsync
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* @drop: the #GdkDrop
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*
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* The ::accept signal is emitted on the drop site when a drop operation
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* is about to begin.
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* If the drop is not accepted, %FALSE will be returned and the drop target
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* will ignore the drop. If %TRUE is returned, the drop is accepted for now
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* but may be rejected later via a call to gtk_drop_target_reject() or
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* ultimately by returning %FALSE from GtkDropTarget::drop
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*
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* The default handler for this signal decides whether to accept the drop
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* based on the formats provided by the @drop.
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*
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* If the decision whether the drop will be accepted or rejected needs
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* further procesing, such as inspecting the data, this function should
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* return %TRUE and proceed as is @drop was accepted and if it decides to
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* reject the drop later, it should call gtk_drop_target_reject_drop().
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*
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* Returns: %TRUE if @drop is accepted
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*/
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signals[ACCEPT] =
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g_signal_new (I_("accept"),
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G_TYPE_FROM_CLASS (class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkDropTargetAsyncClass, accept),
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g_signal_accumulator_first_wins, NULL,
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NULL,
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G_TYPE_BOOLEAN, 1,
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GDK_TYPE_DROP);
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/**
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* GtkDropTargetAsync::drag-enter:
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* @self: the #GtkDropTargetAsync
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* @drop: the #GdkDrop
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* @x: the x coordinate of the current pointer position
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* @y: the y coordinate of the current pointer position
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*
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* The ::drag-enter signal is emitted on the drop site when the pointer
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* enters the widget. It can be used to set up custom highlighting.
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*
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* Returns: Preferred action for this drag operation.
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*/
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signals[DRAG_ENTER] =
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g_signal_new (I_("drag-enter"),
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G_TYPE_FROM_CLASS (class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkDropTargetAsyncClass, drag_enter),
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g_signal_accumulator_first_wins, NULL,
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NULL,
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GDK_TYPE_DRAG_ACTION, 3,
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GDK_TYPE_DROP, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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/**
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* GtkDropTargetAsync::drag-motion:
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* @self: the #GtkDropTargetAsync
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* @drop: the #GdkDrop
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* @x: the x coordinate of the current pointer position
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* @y: the y coordinate of the current pointer position
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*
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* The ::drag-motion signal is emitted while the pointer is moving
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* over the drop target.
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*
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* Returns: Preferred action for this drag operation.
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*/
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signals[DRAG_MOTION] =
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g_signal_new (I_("drag-motion"),
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G_TYPE_FROM_CLASS (class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkDropTargetAsyncClass, drag_motion),
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g_signal_accumulator_first_wins, NULL,
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NULL,
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GDK_TYPE_DRAG_ACTION, 3,
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GDK_TYPE_DROP, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
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/**
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* GtkDropTargetAsync::drag-leave:
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* @self: the #GtkDropTargetAsync
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* @drop: the #GdkDrop
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*
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* The ::drag-leave signal is emitted on the drop site when the pointer
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* leaves the widget. Its main purpose it to undo things done in
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* #GtkDropTargetAsync::drag-enter.
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*/
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signals[DRAG_LEAVE] =
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g_signal_new (I_("drag-leave"),
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G_TYPE_FROM_CLASS (class),
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G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GtkDropTargetAsyncClass, drag_leave),
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NULL, NULL,
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NULL,
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G_TYPE_NONE, 1,
|
|
GDK_TYPE_DROP);
|
|
|
|
/**
|
|
* GtkDropTargetAsync::drop:
|
|
* @self: the #GtkDropTargetAsync
|
|
* @drop: the #GdkDrop
|
|
* @x: the x coordinate of the current pointer position
|
|
* @y: the y coordinate of the current pointer position
|
|
*
|
|
* The ::drop signal is emitted on the drop site when the user drops
|
|
* the data onto the widget. The signal handler must determine whether
|
|
* the pointer position is in a drop zone or not. If it is not in a drop
|
|
* zone, it returns %FALSE and no further processing is necessary.
|
|
*
|
|
* Otherwise, the handler returns %TRUE. In this case, this handler will
|
|
* accept the drop. The handler must ensure that gdk_drop_finish() is
|
|
* called to let the source know that the drop is done. The call to
|
|
* gtk_drag_finish() must only be done when all data has been received.
|
|
*
|
|
* To receive the data, use one of the read functions provides by #GdkDrop
|
|
* such as gdk_drop_read_async() or gdk_drop_read_value_async().
|
|
*
|
|
* Returns: whether the drop is accepted at the given pointer position
|
|
*/
|
|
signals[DROP] =
|
|
g_signal_new (I_("drop"),
|
|
G_TYPE_FROM_CLASS (class),
|
|
G_SIGNAL_RUN_LAST,
|
|
0,
|
|
g_signal_accumulator_first_wins, NULL,
|
|
NULL,
|
|
G_TYPE_BOOLEAN, 3,
|
|
GDK_TYPE_DROP, G_TYPE_DOUBLE, G_TYPE_DOUBLE);
|
|
}
|
|
|
|
static void
|
|
gtk_drop_target_async_init (GtkDropTargetAsync *self)
|
|
{
|
|
}
|
|
|
|
/**
|
|
* gtk_drop_target_async_new:
|
|
* @formats: (nullable) (transfer full): the supported data formats
|
|
* @actions: the supported actions
|
|
*
|
|
* Creates a new #GtkDropTargetAsync object.
|
|
*
|
|
* Returns: the new #GtkDropTargetAsync
|
|
*/
|
|
GtkDropTargetAsync *
|
|
gtk_drop_target_async_new (GdkContentFormats *formats,
|
|
GdkDragAction actions)
|
|
{
|
|
GtkDropTargetAsync *result;
|
|
|
|
result = g_object_new (GTK_TYPE_DROP_TARGET_ASYNC,
|
|
"formats", formats,
|
|
"actions", actions,
|
|
NULL);
|
|
|
|
g_clear_pointer (&formats, gdk_content_formats_unref);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* gtk_drop_target_async_set_formats:
|
|
* @self: a #GtkDropTargetAsync
|
|
* @formats: (nullable): the supported data formats or %NULL for
|
|
* any format.
|
|
*
|
|
* Sets the data formats that this drop target will accept.
|
|
*/
|
|
void
|
|
gtk_drop_target_async_set_formats (GtkDropTargetAsync *self,
|
|
GdkContentFormats *formats)
|
|
{
|
|
g_return_if_fail (GTK_IS_DROP_TARGET_ASYNC (self));
|
|
|
|
if (self->formats == formats)
|
|
return;
|
|
|
|
if (self->formats)
|
|
gdk_content_formats_unref (self->formats);
|
|
|
|
self->formats = formats;
|
|
|
|
if (self->formats)
|
|
gdk_content_formats_ref (self->formats);
|
|
|
|
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_FORMATS]);
|
|
}
|
|
|
|
/**
|
|
* gtk_drop_target_async_get_formats:
|
|
* @self: a #GtkDropTargetAsync
|
|
*
|
|
* Gets the data formats that this drop target accepts.
|
|
*
|
|
* If the result is %NULL, all formats are expected to be supported.
|
|
*
|
|
* Returns: (nullable): the supported data formats
|
|
*/
|
|
GdkContentFormats *
|
|
gtk_drop_target_async_get_formats (GtkDropTargetAsync *self)
|
|
{
|
|
g_return_val_if_fail (GTK_IS_DROP_TARGET_ASYNC (self), NULL);
|
|
|
|
return self->formats;
|
|
}
|
|
|
|
/**
|
|
* gtk_drop_target_async_set_actions:
|
|
* @self: a #GtkDropTargetAsync
|
|
* @actions: the supported actions
|
|
*
|
|
* Sets the actions that this drop target supports.
|
|
*/
|
|
void
|
|
gtk_drop_target_async_set_actions (GtkDropTargetAsync *self,
|
|
GdkDragAction actions)
|
|
{
|
|
g_return_if_fail (GTK_IS_DROP_TARGET_ASYNC (self));
|
|
|
|
if (self->actions == actions)
|
|
return;
|
|
|
|
self->actions = actions;
|
|
|
|
g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_ACTIONS]);
|
|
}
|
|
|
|
/**
|
|
* gtk_drop_target_async_get_actions:
|
|
* @self: a #GtkDropTargetAsync
|
|
*
|
|
* Gets the actions that this drop target supports.
|
|
*
|
|
* Returns: the actions that this drop target supports
|
|
*/
|
|
GdkDragAction
|
|
gtk_drop_target_async_get_actions (GtkDropTargetAsync *self)
|
|
{
|
|
g_return_val_if_fail (GTK_IS_DROP_TARGET_ASYNC (self), 0);
|
|
|
|
return self->actions;
|
|
}
|
|
|
|
/**
|
|
* gtk_drop_target_async_reject_drop:
|
|
* @self: a #GtkDropTargetAsync
|
|
* @drop: the #GdkDrop of an ongoing drag operation
|
|
*
|
|
* Sets the @drop as not accepted on this drag site.
|
|
*
|
|
* This function should be used when delaying the decision
|
|
* on whether to accept a drag or not until after reading
|
|
* the data.
|
|
*/
|
|
void
|
|
gtk_drop_target_async_reject_drop (GtkDropTargetAsync *self,
|
|
GdkDrop *drop)
|
|
{
|
|
g_return_if_fail (GTK_IS_DROP_TARGET_ASYNC (self));
|
|
g_return_if_fail (GDK_IS_DROP (drop));
|
|
g_return_if_fail (self->drop == drop);
|
|
|
|
if (self->rejected)
|
|
return;
|
|
|
|
self->rejected = TRUE;
|
|
gtk_widget_unset_state_flags (gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (self)),
|
|
GTK_STATE_FLAG_DROP_ACTIVE);
|
|
}
|