forked from AuroraMiddleware/gtk
391 lines
12 KiB
C
391 lines
12 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 "gtkdragsource.h"
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#include "gtkdnd.h"
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#include "gtkdndprivate.h"
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#include "gtkgesturedrag.h"
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#include "gtkimagedefinitionprivate.h"
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#include "gtkintl.h"
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typedef struct _GtkDragSourceSite GtkDragSourceSite;
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struct _GtkDragSourceSite
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{
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GdkModifierType start_button_mask;
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GdkContentFormats *target_list; /* Targets for drag data */
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GdkDragAction actions; /* Possible actions */
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GtkImageDefinition *image_def;
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GtkGesture *drag_gesture;
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};
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static void
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gtk_drag_source_gesture_begin (GtkGesture *gesture,
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GdkEventSequence *sequence,
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gpointer data)
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{
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GtkDragSourceSite *site = data;
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guint button;
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if (gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture)))
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button = 1;
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else
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button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
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g_assert (button >= 1);
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if (!site->start_button_mask ||
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!(site->start_button_mask & (GDK_BUTTON1_MASK << (button - 1))))
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gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
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}
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static void
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gtk_drag_source_gesture_update (GtkGesture *gesture,
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GdkEventSequence *sequence,
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gpointer data)
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{
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gdouble start_x, start_y, offset_x, offset_y;
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GtkDragSourceSite *site = data;
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GtkWidget *widget;
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widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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if (gtk_gesture_is_recognized (site->drag_gesture))
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{
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gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (site->drag_gesture),
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&start_x, &start_y);
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gtk_gesture_drag_get_offset (GTK_GESTURE_DRAG (site->drag_gesture),
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&offset_x, &offset_y);
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if (gtk_drag_check_threshold (widget, start_x, start_y,
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start_x + offset_x, start_y + offset_y))
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{
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GdkDevice *device = gtk_gesture_get_device (site->drag_gesture);
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gtk_event_controller_reset (GTK_EVENT_CONTROLLER (site->drag_gesture));
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gtk_drag_begin_internal (widget,
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device,
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site->image_def, site->target_list,
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site->actions,
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start_x, start_y);
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}
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}
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}
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static void
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gtk_drag_source_site_destroy (gpointer data)
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{
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GtkDragSourceSite *site = data;
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if (site->target_list)
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gdk_content_formats_unref (site->target_list);
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gtk_image_definition_unref (site->image_def);
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/* This gets called only during widget finalization.
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* And widget finalization takes care of gestures. */
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g_slice_free (GtkDragSourceSite, site);
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}
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/**
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* gtk_drag_source_set: (method)
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* @widget: a #GtkWidget
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* @start_button_mask: the bitmask of buttons that can start the drag
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* @targets: (allow-none): the targets that the drag will support,
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* may be %NULL
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* @actions: the bitmask of possible actions for a drag from this widget
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*
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* Sets up a widget so that GTK+ will start a drag operation when the user
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* clicks and drags on the widget. The widget must have a window.
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*/
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void
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gtk_drag_source_set (GtkWidget *widget,
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GdkModifierType start_button_mask,
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GdkContentFormats *targets,
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GdkDragAction actions)
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{
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GtkDragSourceSite *site;
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g_return_if_fail (GTK_IS_WIDGET (widget));
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site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
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if (site)
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{
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if (site->target_list)
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gdk_content_formats_unref (site->target_list);
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}
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else
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{
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site = g_slice_new0 (GtkDragSourceSite);
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site->image_def = gtk_image_definition_new_empty ();
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site->drag_gesture = gtk_gesture_drag_new ();
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gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (site->drag_gesture),
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GTK_PHASE_CAPTURE);
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (site->drag_gesture), 0);
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g_signal_connect (site->drag_gesture, "begin",
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G_CALLBACK (gtk_drag_source_gesture_begin),
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site);
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g_signal_connect (site->drag_gesture, "update",
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G_CALLBACK (gtk_drag_source_gesture_update),
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site);
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gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (site->drag_gesture));
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g_object_set_data_full (G_OBJECT (widget),
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I_("gtk-site-data"),
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site, gtk_drag_source_site_destroy);
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}
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site->start_button_mask = start_button_mask;
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if (targets)
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site->target_list = gdk_content_formats_ref (targets);
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else
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site->target_list = NULL;
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site->actions = actions;
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}
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/**
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* gtk_drag_source_unset: (method)
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* @widget: a #GtkWidget
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*
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* Undoes the effects of gtk_drag_source_set().
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*/
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void
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gtk_drag_source_unset (GtkWidget *widget)
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{
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_object_set_data (G_OBJECT (widget), I_("gtk-site-data"), NULL);
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}
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/**
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* gtk_drag_source_get_target_list: (method)
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* @widget: a #GtkWidget
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*
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* Gets the list of targets this widget can provide for
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* drag-and-drop.
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*
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* Returns: (nullable) (transfer none): the #GdkContentFormats, or %NULL if none
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*/
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GdkContentFormats *
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gtk_drag_source_get_target_list (GtkWidget *widget)
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{
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GtkDragSourceSite *site;
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g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
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site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
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return site ? site->target_list : NULL;
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}
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/**
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* gtk_drag_source_set_target_list: (method)
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* @widget: a #GtkWidget that’s a drag source
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* @target_list: (allow-none): list of draggable targets, or %NULL for none
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*
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* Changes the target types that this widget offers for drag-and-drop.
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* The widget must first be made into a drag source with
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* gtk_drag_source_set().
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*/
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void
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gtk_drag_source_set_target_list (GtkWidget *widget,
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GdkContentFormats *target_list)
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{
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GtkDragSourceSite *site;
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g_return_if_fail (GTK_IS_WIDGET (widget));
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site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
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if (site == NULL)
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{
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g_warning ("gtk_drag_source_set_target_list() requires the widget "
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"to already be a drag source.");
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return;
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}
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if (target_list)
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gdk_content_formats_ref (target_list);
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if (site->target_list)
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gdk_content_formats_unref (site->target_list);
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site->target_list = target_list;
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}
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/**
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* gtk_drag_source_add_text_targets: (method)
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* @widget: a #GtkWidget that’s is a drag source
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*
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* Add the text targets supported by #GtkSelectionData to
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* the target list of the drag source. The targets
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* are added with @info = 0. If you need another value,
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* use gtk_content_formats_add_text_targets() and
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* gtk_drag_source_set_target_list().
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*/
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void
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gtk_drag_source_add_text_targets (GtkWidget *widget)
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{
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GdkContentFormats *target_list;
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target_list = gtk_drag_source_get_target_list (widget);
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if (target_list)
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gdk_content_formats_ref (target_list);
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else
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target_list = gdk_content_formats_new (NULL, 0);
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target_list = gtk_content_formats_add_text_targets (target_list);
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gtk_drag_source_set_target_list (widget, target_list);
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gdk_content_formats_unref (target_list);
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}
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/**
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* gtk_drag_source_add_image_targets: (method)
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* @widget: a #GtkWidget that’s is a drag source
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*
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* Add the writable image targets supported by #GtkSelectionData to
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* the target list of the drag source. The targets
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* are added with @info = 0. If you need another value,
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* use gtk_target_list_add_image_targets() and
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* gtk_drag_source_set_target_list().
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*/
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void
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gtk_drag_source_add_image_targets (GtkWidget *widget)
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{
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GdkContentFormats *target_list;
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target_list = gtk_drag_source_get_target_list (widget);
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if (target_list)
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gdk_content_formats_ref (target_list);
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else
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target_list = gdk_content_formats_new (NULL, 0);
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target_list = gtk_content_formats_add_image_targets (target_list, TRUE);
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gtk_drag_source_set_target_list (widget, target_list);
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gdk_content_formats_unref (target_list);
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}
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/**
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* gtk_drag_source_add_uri_targets: (method)
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* @widget: a #GtkWidget that’s is a drag source
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*
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* Add the URI targets supported by #GtkSelectionData to
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* the target list of the drag source. The targets
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* are added with @info = 0. If you need another value,
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* use gtk_content_formats_add_uri_targets() and
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* gtk_drag_source_set_target_list().
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*/
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void
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gtk_drag_source_add_uri_targets (GtkWidget *widget)
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{
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GdkContentFormats *target_list;
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target_list = gtk_drag_source_get_target_list (widget);
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if (target_list)
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gdk_content_formats_ref (target_list);
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else
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target_list = gdk_content_formats_new (NULL, 0);
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target_list = gtk_content_formats_add_uri_targets (target_list);
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gtk_drag_source_set_target_list (widget, target_list);
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gdk_content_formats_unref (target_list);
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}
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/**
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* gtk_drag_source_set_icon_name: (method)
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* @widget: a #GtkWidget
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* @icon_name: name of icon to use
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*
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* Sets the icon that will be used for drags from a particular source
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* to a themed icon. See the docs for #GtkIconTheme for more details.
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*/
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void
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gtk_drag_source_set_icon_name (GtkWidget *widget,
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const gchar *icon_name)
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{
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GtkDragSourceSite *site;
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (icon_name != NULL);
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site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
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g_return_if_fail (site != NULL);
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gtk_image_definition_unref (site->image_def);
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site->image_def = gtk_image_definition_new_icon_name (icon_name);
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}
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/**
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* gtk_drag_source_set_icon_gicon: (method)
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* @widget: a #GtkWidget
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* @icon: A #GIcon
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*
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* Sets the icon that will be used for drags from a particular source
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* to @icon. See the docs for #GtkIconTheme for more details.
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*/
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void
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gtk_drag_source_set_icon_gicon (GtkWidget *widget,
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GIcon *icon)
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{
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GtkDragSourceSite *site;
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (icon != NULL);
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site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
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g_return_if_fail (site != NULL);
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gtk_image_definition_unref (site->image_def);
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site->image_def = gtk_image_definition_new_gicon (icon);
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}
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/**
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* gtk_drag_source_set_icon_paintable: (method)
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* @widget: a #GtkWidget
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* @paintable: A #GdkPaintable
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*
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* Sets the icon that will be used for drags from a particular source
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* to @paintable.
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*/
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void
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gtk_drag_source_set_icon_paintable (GtkWidget *widget,
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GdkPaintable *paintable)
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{
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GtkDragSourceSite *site;
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (GDK_IS_PAINTABLE (paintable));
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site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
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g_return_if_fail (site != NULL);
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gtk_image_definition_unref (site->image_def);
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site->image_def = gtk_image_definition_new_paintable (paintable);
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}
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