gtk2/tests/testdnd.c
2020-01-08 18:48:20 -05:00

660 lines
23 KiB
C

/* testdnd.c
* Copyright (C) 1998 Red Hat, Inc.
* Author: Owen Taylor
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtk/gtk.h"
/* Target side drag signals */
/* XPM */
static const char * drag_icon_xpm[] = {
"36 48 9 1",
" c None",
". c #020204",
"+ c #8F8F90",
"@ c #D3D3D2",
"# c #AEAEAC",
"$ c #ECECEC",
"% c #A2A2A4",
"& c #FEFEFC",
"* c #BEBEBC",
" .....................",
" ..&&&&&&&&&&&&&&&&&&&.",
" ...&&&&&&&&&&&&&&&&&&&.",
" ..&.&&&&&&&&&&&&&&&&&&&.",
" ..&&.&&&&&&&&&&&&&&&&&&&.",
" ..&&&.&&&&&&&&&&&&&&&&&&&.",
" ..&&&&.&&&&&&&&&&&&&&&&&&&.",
" ..&&&&&.&&&@&&&&&&&&&&&&&&&.",
" ..&&&&&&.*$%$+$&&&&&&&&&&&&&.",
" ..&&&&&&&.%$%$+&&&&&&&&&&&&&&.",
" ..&&&&&&&&.#&#@$&&&&&&&&&&&&&&.",
" ..&&&&&&&&&.#$**#$&&&&&&&&&&&&&.",
" ..&&&&&&&&&&.&@%&%$&&&&&&&&&&&&&.",
" ..&&&&&&&&&&&.&&&&&&&&&&&&&&&&&&&.",
" ..&&&&&&&&&&&&.&&&&&&&&&&&&&&&&&&&.",
"................&$@&&&@&&&&&&&&&&&&.",
".&&&&&&&+&&#@%#+@#@*$%$+$&&&&&&&&&&.",
".&&&&&&&+&&#@#@&&@*%$%$+&&&&&&&&&&&.",
".&&&&&&&+&$%&#@&#@@#&#@$&&&&&&&&&&&.",
".&&&&&&@#@@$&*@&@#@#$**#$&&&&&&&&&&.",
".&&&&&&&&&&&&&&&&&&&@%&%$&&&&&&&&&&.",
".&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.",
".&&&&&&&&$#@@$&&&&&&&&&&&&&&&&&&&&&.",
".&&&&&&&&&+&$+&$&@&$@&&$@&&&&&&&&&&.",
".&&&&&&&&&+&&#@%#+@#@*$%&+$&&&&&&&&.",
".&&&&&&&&&+&&#@#@&&@*%$%$+&&&&&&&&&.",
".&&&&&&&&&+&$%&#@&#@@#&#@$&&&&&&&&&.",
".&&&&&&&&@#@@$&*@&@#@#$#*#$&&&&&&&&.",
".&&&&&&&&&&&&&&&&&&&&&$%&%$&&&&&&&&.",
".&&&&&&&&&&$#@@$&&&&&&&&&&&&&&&&&&&.",
".&&&&&&&&&&&+&$%&$$@&$@&&$@&&&&&&&&.",
".&&&&&&&&&&&+&&#@%#+@#@*$%$+$&&&&&&.",
".&&&&&&&&&&&+&&#@#@&&@*#$%$+&&&&&&&.",
".&&&&&&&&&&&+&$+&*@&#@@#&#@$&&&&&&&.",
".&&&&&&&&&&$%@@&&*@&@#@#$#*#&&&&&&&.",
".&&&&&&&&&&&&&&&&&&&&&&&$%&%$&&&&&&.",
".&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.",
".&&&&&&&&&&&&&&$#@@$&&&&&&&&&&&&&&&.",
".&&&&&&&&&&&&&&&+&$%&$$@&$@&&$@&&&&.",
".&&&&&&&&&&&&&&&+&&#@%#+@#@*$%$+$&&.",
".&&&&&&&&&&&&&&&+&&#@#@&&@*#$%$+&&&.",
".&&&&&&&&&&&&&&&+&$+&*@&#@@#&#@$&&&.",
".&&&&&&&&&&&&&&$%@@&&*@&@#@#$#*#&&&.",
".&&&&&&&&&&&&&&&&&&&&&&&&&&&$%&%$&&.",
".&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.",
".&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.",
".&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&.",
"...................................."};
/* XPM */
static const char * trashcan_closed_xpm[] = {
"64 80 17 1",
" c None",
". c #030304",
"+ c #5A5A5C",
"@ c #323231",
"# c #888888",
"$ c #1E1E1F",
"% c #767677",
"& c #494949",
"* c #9E9E9C",
"= c #111111",
"- c #3C3C3D",
"; c #6B6B6B",
"> c #949494",
", c #282828",
"' c #808080",
") c #545454",
"! c #AEAEAC",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ==......=$$...=== ",
" ..$------)+++++++++++++@$$... ",
" ..=@@-------&+++++++++++++++++++-.... ",
" =.$$@@@-&&)++++)-,$$$$=@@&+++++++++++++,..$ ",
" .$$$$@@&+++++++&$$$@@@@-&,$,-++++++++++;;;&.. ",
" $$$$,@--&++++++&$$)++++++++-,$&++++++;%%'%%;;$@ ",
" .-@@-@-&++++++++-@++++++++++++,-++++++;''%;;;%*-$ ",
" +------++++++++++++++++++++++++++++++;;%%%;;##*!. ",
" =+----+++++++++++++++++++++++;;;;;;;;;;;;%'>>). ",
" .=)&+++++++++++++++++;;;;;;;;;;;;;;%''>>#>#@. ",
" =..=&++++++++++++;;;;;;;;;;;;;%###>>###+%== ",
" .&....=-+++++%;;####''''''''''##'%%%)..#. ",
" .+-++@....=,+%#####'%%%%%%%%%;@$-@-@*++!. ",
" .+-++-+++-&-@$$=$=......$,,,@;&)+!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" =+-++-+++-+++++++++!++++!++++!+++!++!+++= ",
" $.++-+++-+++++++++!++++!++++!+++!++!+.$ ",
" =.++++++++++++++!++++!++++!+++!++.= ",
" $..+++++++++++++++!++++++...$ ",
" $$=.............=$$ ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" "};
/* XPM */
static const char * trashcan_open_xpm[] = {
"64 80 17 1",
" c None",
". c #030304",
"+ c #5A5A5C",
"@ c #323231",
"# c #888888",
"$ c #1E1E1F",
"% c #767677",
"& c #494949",
"* c #9E9E9C",
"= c #111111",
"- c #3C3C3D",
"; c #6B6B6B",
"> c #949494",
", c #282828",
"' c #808080",
") c #545454",
"! c #AEAEAC",
" ",
" ",
" ",
" ",
" ",
" ",
" .=.==.,@ ",
" ==.,@-&&&)-= ",
" .$@,&++;;;%>*- ",
" $,-+)+++%%;;'#+. ",
" =---+++++;%%%;%##@. ",
" @)++++++++;%%%%'#%$ ",
" $&++++++++++;%%;%##@= ",
" ,-++++)+++++++;;;'#%) ",
" @+++&&--&)++++;;%'#'-. ",
" ,&++-@@,,,,-)++;;;'>'+, ",
" =-++&@$@&&&&-&+;;;%##%+@ ",
" =,)+)-,@@&+++++;;;;%##%&@ ",
" @--&&,,@&)++++++;;;;'#)@ ",
" ---&)-,@)+++++++;;;%''+, ",
" $--&)+&$-+++++++;;;%%'';- ",
" .,-&+++-$&++++++;;;%''%&= ",
" $,-&)++)-@++++++;;%''%), ",
" =,@&)++++&&+++++;%'''+$@&++++++ ",
" .$@-++++++++++++;'#';,........=$@&++++ ",
" =$@@&)+++++++++++'##-.................=&++ ",
" .$$@-&)+++++++++;%#+$.....................=)+ ",
" $$,@-)+++++++++;%;@=........................,+ ",
" .$$@@-++++++++)-)@=............................ ",
" $,@---)++++&)@===............................,. ",
" $-@---&)))-$$=..............................=)!. ",
" --&-&&,,$=,==...........................=&+++!. ",
" =,=$..=$+)+++++&@$=.............=$@&+++++!++!. ",
" .)-++-+++++++++++++++++++++++++++!++!++!. ",
" .+-++-+++++++++++++++++++++++!+++!++!++!. ",
" .+-++-+++-+++++++++!+++!!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" .+-++-+++-+++++++++!++++!++++!+++!++!++!. ",
" =+-++-+++-+++++++++!++++!++++!+++!++!+++= ",
" $.++-+++-+++++++++!++++!++++!+++!++!+.$ ",
" =.++++++++++++++!++++!++++!+++!++.= ",
" $..+++++++++++++++!++++++...$ ",
" $$==...........==$$ ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" "};
GdkPixbuf *trashcan_open;
GdkPixbuf *trashcan_closed;
gboolean have_drag;
static const char *target_table[] = {
"STRING",
"text/plain",
"application/x-rootwindow-drop"
};
static guint n_targets = sizeof(target_table) / sizeof(target_table[0]);
void
target_drag_leave (GtkDropTarget *dest,
GtkWidget *widget)
{
g_print("leave\n");
have_drag = FALSE;
gtk_image_set_from_pixbuf (GTK_IMAGE (widget), trashcan_closed);
}
gboolean
target_drag_motion (GtkDropTarget *dest,
int x,
int y,
GtkWidget *widget)
{
GdkDrop *drop = gtk_drop_target_get_drop (dest);
char *s;
if (!have_drag)
{
have_drag = TRUE;
gtk_image_set_from_pixbuf (GTK_IMAGE (widget), trashcan_open);
}
s = gdk_content_formats_to_string (gdk_drop_get_formats (drop));
g_print ("%s\n", s);
gdk_drop_status (drop, GDK_ACTION_ALL);
return TRUE;
}
static void
got_text_in_target (GObject *object,
GAsyncResult *result,
gpointer data)
{
char *str;
str = gdk_drop_read_text_finish (GDK_DROP (object), result, NULL);
if (str)
{
g_print ("Received \"%s\" in target\n", str);
g_free (str);
}
}
gboolean
target_drag_drop (GtkDropTarget *dest,
int x,
int y,
GtkWidget *widget)
{
GdkDrop *drop = gtk_drop_target_get_drop (dest);
GdkContentFormats *formats;
const char *format;
g_print("drop\n");
have_drag = FALSE;
gtk_image_set_from_pixbuf (GTK_IMAGE (widget), trashcan_closed);
formats = gdk_drop_get_formats (drop);
format = gdk_content_formats_match_mime_type (formats, formats);
if (format)
{
gdk_drop_read_text_async (drop, NULL, got_text_in_target, widget);
return TRUE;
}
return FALSE;
}
static GdkDragAction
action_make_unique (GdkDragAction action)
{
if (gdk_drag_action_is_unique (action))
return action;
if (action & GDK_ACTION_COPY)
return GDK_ACTION_COPY;
if (action & GDK_ACTION_MOVE)
return GDK_ACTION_MOVE;
if (action & GDK_ACTION_LINK)
return GDK_ACTION_LINK;
g_assert_not_reached ();
return 0;
}
static void
got_text (GObject *object,
GAsyncResult *result,
gpointer data)
{
char *str;
str = gdk_drop_read_text_finish (GDK_DROP (object), result, NULL);
if (str)
{
g_print ("Received \"%s\" in label\n", str);
g_free (str);
}
}
void
label_drag_drop (GtkDropTarget *dest,
int x,
int y,
GtkWidget *widget)
{
GdkDrop *drop = gtk_drop_target_get_drop (dest);
gdk_drop_read_text_async (drop, NULL, got_text, widget);
GdkDragAction action = action_make_unique (gdk_drop_get_actions (drop));
gdk_drop_finish (drop, action);
}
/* The following is a rather elaborate example demonstrating/testing
* changing of the window hierarchy during a drag - in this case,
* via a "spring-loaded" popup window.
*/
static GtkWidget *popup_window = NULL;
static gboolean popped_up = FALSE;
static gboolean in_popup = FALSE;
static guint popdown_timer = 0;
static guint popup_timer = 0;
gint
popdown_cb (gpointer data)
{
popdown_timer = 0;
gtk_widget_hide (popup_window);
popped_up = FALSE;
return FALSE;
}
gboolean
popup_motion (GtkDropTarget *dest,
int x,
int y)
{
if (!in_popup)
{
in_popup = TRUE;
if (popdown_timer)
{
g_print ("removed popdown\n");
g_source_remove (popdown_timer);
popdown_timer = 0;
}
}
return TRUE;
}
void
popup_leave (GtkDropTarget *dest)
{
if (in_popup)
{
in_popup = FALSE;
if (!popdown_timer)
{
g_print ("added popdown\n");
popdown_timer = g_timeout_add (500, popdown_cb, NULL);
}
}
}
gboolean
popup_cb (gpointer data)
{
if (!popped_up)
{
if (!popup_window)
{
GtkWidget *button;
GtkWidget *grid;
int i, j;
GdkContentFormats *targets;
popup_window = gtk_window_new (GTK_WINDOW_POPUP);
grid = gtk_grid_new ();
targets = gdk_content_formats_new (target_table, n_targets - 1); /* no rootwin */
for (i=0; i<3; i++)
for (j=0; j<3; j++)
{
char buffer[128];
GtkDropTarget *dest;
g_snprintf(buffer, sizeof(buffer), "%d,%d", i, j);
button = gtk_button_new_with_label (buffer);
gtk_widget_set_hexpand (button, TRUE);
gtk_widget_set_vexpand (button, TRUE);
gtk_grid_attach (GTK_GRID (grid), button, i, j, 1, 1);
dest = gtk_drop_target_new (GTK_DEST_DEFAULT_ALL, targets, GDK_ACTION_COPY | GDK_ACTION_MOVE);
g_signal_connect (dest, "drag-motion", G_CALLBACK (popup_motion), NULL);
g_signal_connect (dest, "drag-leave", G_CALLBACK (popup_leave), NULL);
gtk_drop_target_attach (dest, button);
}
gtk_container_add (GTK_CONTAINER (popup_window), grid);
gdk_content_formats_unref (targets);
}
gtk_widget_show (popup_window);
popped_up = TRUE;
}
popdown_timer = g_timeout_add (500, popdown_cb, NULL);
g_print ("added popdown\n");
popup_timer = FALSE;
return FALSE;
}
gboolean
popsite_motion (GtkDropTarget *dest,
int x,
int y,
GtkWidget *widget)
{
if (!popup_timer)
popup_timer = g_timeout_add (500, popup_cb, NULL);
return TRUE;
}
void
popsite_leave (GtkDropTarget *dest)
{
if (popup_timer)
{
g_source_remove (popup_timer);
popup_timer = 0;
}
}
void
source_drag_data_delete (GtkWidget *widget,
gpointer data)
{
g_print ("Delete the data!\n");
}
void
test_init (void)
{
if (g_file_test ("../modules/input/immodules.cache", G_FILE_TEST_EXISTS))
g_setenv ("GTK_IM_MODULE_FILE", "../modules/input/immodules.cache", TRUE);
}
int
main (int argc, char **argv)
{
GtkWidget *window;
GtkWidget *grid;
GtkWidget *label;
GtkWidget *pixmap;
GtkWidget *button;
GdkPixbuf *drag_icon;
GdkTexture *texture;
GdkContentProvider *content;
GValue value = G_VALUE_INIT;
GtkDragSource *source;
GdkContentFormats *targets;
GtkDropTarget *dest;
test_init ();
gtk_init ();
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_main_quit), NULL);
grid = gtk_grid_new ();
gtk_container_add (GTK_CONTAINER (window), grid);
drag_icon = gdk_pixbuf_new_from_xpm_data (drag_icon_xpm);
texture = gdk_texture_new_for_pixbuf (drag_icon);
g_object_unref (drag_icon);
trashcan_open = gdk_pixbuf_new_from_xpm_data (trashcan_open_xpm);
trashcan_closed = gdk_pixbuf_new_from_xpm_data (trashcan_closed_xpm);
label = gtk_label_new ("Drop Here\n");
targets = gdk_content_formats_new (target_table, n_targets - 1); /* no rootwin */
dest = gtk_drop_target_new (GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_HIGHLIGHT, targets, GDK_ACTION_COPY | GDK_ACTION_MOVE);
g_signal_connect (dest, "drag-drop", G_CALLBACK (label_drag_drop), NULL);
gtk_drop_target_attach (dest, label);
gtk_widget_set_hexpand (label, TRUE);
gtk_widget_set_vexpand (label, TRUE);
gtk_grid_attach (GTK_GRID (grid), label, 0, 0, 1, 1);
label = gtk_label_new ("Popup\n");
dest = gtk_drop_target_new (GTK_DEST_DEFAULT_ALL, targets, GDK_ACTION_COPY | GDK_ACTION_MOVE);
g_signal_connect (dest, "drag-motion", G_CALLBACK (popsite_motion), NULL);
g_signal_connect (dest, "drag-leave", G_CALLBACK (popsite_leave), NULL);
gtk_drop_target_attach (dest, label);
gtk_widget_set_hexpand (label, TRUE);
gtk_widget_set_vexpand (label, TRUE);
gtk_grid_attach (GTK_GRID (grid), label, 1, 1, 1, 1);
gdk_content_formats_unref (targets);
pixmap = gtk_image_new_from_pixbuf (trashcan_closed);
targets = gdk_content_formats_new (NULL, 0);
dest = gtk_drop_target_new (0, targets, 0);
g_signal_connect (dest, "drag-leave", G_CALLBACK (target_drag_leave), pixmap);
g_signal_connect (dest, "drag-motion", G_CALLBACK (target_drag_motion), pixmap);
g_signal_connect (dest, "drag-drop", G_CALLBACK (target_drag_drop), pixmap);
gtk_drop_target_attach (dest, pixmap);
gdk_content_formats_unref (targets);
gtk_widget_set_hexpand (pixmap, TRUE);
gtk_widget_set_vexpand (pixmap, TRUE);
gtk_grid_attach (GTK_GRID (grid), pixmap, 1, 0, 1, 1);
/* Drag site */
button = gtk_button_new_with_label ("Drag Here\n");
g_value_init (&value, G_TYPE_STRING);
g_value_set_string (&value, "I'm data!");
content = gdk_content_provider_new_for_value (&value);
g_value_unset (&value);
source = gtk_drag_source_new (content, GDK_ACTION_COPY | GDK_ACTION_MOVE);
gtk_drag_source_attach (source, button, GDK_BUTTON1_MASK | GDK_BUTTON3_MASK);
gtk_drag_source_set_icon (source, GDK_PAINTABLE (texture), 0, 0);
g_object_unref (texture);
gtk_widget_set_hexpand (button, TRUE);
gtk_widget_set_vexpand (button, TRUE);
gtk_grid_attach (GTK_GRID (grid), button, 0, 1, 1, 1);
g_signal_connect (source, "drag-data-delete",
G_CALLBACK (source_drag_data_delete), NULL);
gtk_widget_show (window);
gtk_main ();
return 0;
}