summaryrefslogtreecommitdiff
path: root/applets/wncklet/showdesktop.c
blob: d6c77a50ea890e260216fb72cea7e11fdfcaa8b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
/* -*- mode: C; c-file-style: "linux" -*- */
/* "Show desktop" panel applet */

/*
 * Copyright (C) 2002 Red Hat, Inc.
 * Developed by Havoc Pennington
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
	#include <config.h>
#endif

#ifndef HAVE_X11
#error file should only be built when HAVE_X11 is enabled
#endif

#include <glib/gi18n.h>

#include <gtk/gtk.h>
#include <gdk/gdkx.h>

#define WNCK_I_KNOW_THIS_IS_UNSTABLE
#include <libwnck/libwnck.h>

#include "wncklet.h"
#include "showdesktop.h"

#include <string.h>

#define TIMEOUT_ACTIVATE_SECONDS 1
#define SHOW_DESKTOP_ICON "user-desktop"


typedef struct {
	/* widgets */
	GtkWidget* applet;
	GtkWidget* button;
	GtkWidget* image;

	GtkOrientation orient;
	int size;

	WnckScreen* wnck_screen;

	guint showing_desktop: 1;
	guint button_activate;

	GtkIconTheme* icon_theme;
} ShowDesktopData;

static void display_help_dialog(GtkAction* action, ShowDesktopData* sdd);
static void display_about_dialog(GtkAction* action, ShowDesktopData* sdd);

static void update_icon(ShowDesktopData* sdd);
static void update_button_state(ShowDesktopData* sdd);
static void update_button_display(ShowDesktopData* sdd);

static void theme_changed_callback(GtkIconTheme* icon_theme, ShowDesktopData* sdd);

static void button_toggled_callback(GtkWidget* button, ShowDesktopData* sdd);
static void show_desktop_changed_callback(WnckScreen* screen, ShowDesktopData* sdd);

/* this is when the panel orientation changes */

static void applet_change_orient(MatePanelApplet* applet, MatePanelAppletOrient orient, ShowDesktopData* sdd)
{
	GtkOrientation new_orient;

	switch (orient)
	{
		case MATE_PANEL_APPLET_ORIENT_LEFT:
		case MATE_PANEL_APPLET_ORIENT_RIGHT:
			new_orient = GTK_ORIENTATION_VERTICAL;
			break;
		case MATE_PANEL_APPLET_ORIENT_UP:
		case MATE_PANEL_APPLET_ORIENT_DOWN:
		default:
			new_orient = GTK_ORIENTATION_HORIZONTAL;
			break;
	}

	if (new_orient == sdd->orient)
		return;

	sdd->orient = new_orient;

	update_icon (sdd);
}

/* this is when the panel size changes */
static void button_size_allocated(GtkWidget* button, GtkAllocation* allocation, ShowDesktopData* sdd)
{
	/*
	if ((sdd->orient == GTK_ORIENTATION_HORIZONTAL) && (sdd->size == allocation->height))
	{
		return;
	}
	else if ((sdd->orient == GTK_ORIENTATION_VERTICAL) && (sdd->size == allocation->width))
	{
		return;
	}
	*/

	if (((sdd->orient == GTK_ORIENTATION_HORIZONTAL) && (sdd->size == allocation->height)) || ((sdd->orient == GTK_ORIENTATION_VERTICAL) && (sdd->size == allocation->width)))
		return;

	switch (sdd->orient)
	{
		case GTK_ORIENTATION_HORIZONTAL:
			sdd->size = allocation->height;
			break;
		case GTK_ORIENTATION_VERTICAL:
			sdd->size = allocation->width;
			break;
	}

	update_icon(sdd);
}

static void update_icon(ShowDesktopData* sdd)
{
	GtkStyleContext *context;
	GtkStateFlags    state;
	GtkBorder        padding;
	int width, height;
	cairo_surface_t* icon;
	cairo_surface_t* scaled;
	int icon_size, icon_scale;
	GError* error;
	int thickness = 0;

	if (!sdd->icon_theme)
		return;

	state = gtk_widget_get_state_flags (sdd->button);
	context = gtk_widget_get_style_context (sdd->button);
	gtk_style_context_get_padding (context, state, &padding);

	switch (sdd->orient) {
	case GTK_ORIENTATION_HORIZONTAL:
		thickness = padding.top + padding.bottom;
		break;
	case GTK_ORIENTATION_VERTICAL:
		thickness = padding.left + padding.right;
		break;
	}

	icon_scale = gtk_widget_get_scale_factor (sdd->button);
	icon_size = sdd->size * icon_scale - thickness;

	if (icon_size < 22)
		icon_size = 16;
	else if (icon_size < 24)
		icon_size = 22;
	else if (icon_size < 32)
		icon_size = 24;
	else if (icon_size < 48)
		icon_size = 32;
	else if (icon_size < 64)
		icon_size = 48;
	else if (icon_size < 128)
		icon_size = 64;

	error = NULL;
	icon = gtk_icon_theme_load_surface (sdd->icon_theme, SHOW_DESKTOP_ICON, icon_size, icon_scale, NULL, 0, &error);

	if (icon == NULL)
	{
		g_printerr(_("Failed to load %s: %s\n"), SHOW_DESKTOP_ICON, error ? error->message : _("Icon not found"));

		if (error)
		{
			g_error_free(error);
			error = NULL;
		}

		gtk_image_set_from_icon_name (GTK_IMAGE (sdd->image), "image-missing", GTK_ICON_SIZE_SMALL_TOOLBAR);
		return;
	}

	width = cairo_image_surface_get_width (icon);
	height = cairo_image_surface_get_height (icon);

	scaled = NULL;

	/* Make it fit on the given panel */
	switch (sdd->orient)
	{
		case GTK_ORIENTATION_HORIZONTAL:
			width = (icon_size / icon_scale * width) / height;
			height = icon_size / icon_scale;
			break;
		case GTK_ORIENTATION_VERTICAL:
			height = (icon_size / icon_scale * height) / width;
			width = icon_size / icon_scale;
			break;
	}

	scaled = cairo_surface_create_similar (icon,
		                               cairo_surface_get_content (icon),
		                               width,
		                               height);

	if (scaled != NULL)
	{
		cairo_t *cr;
		cr = cairo_create (scaled);
		cairo_scale (cr, (double) width / icon_size, (double) height / icon_size);
		cairo_set_source_surface (cr, icon, 0, 0);
		cairo_paint (cr);
		gtk_image_set_from_surface (GTK_IMAGE(sdd->image), scaled);
		cairo_surface_destroy (scaled);
	}
	else
	{
		gtk_image_set_from_surface (GTK_IMAGE (sdd->image), icon);
	}

	cairo_surface_destroy (icon);
}

static const GtkActionEntry show_desktop_menu_actions[] = {
	{
		"ShowDesktopHelp",
		"help-browser",
		N_("_Help"),
		NULL,
		NULL,
		G_CALLBACK(display_help_dialog)
	},
	{
		"ShowDesktopAbout",
		"help-about",
		N_("_About"),
		NULL,
		NULL,
		G_CALLBACK(display_about_dialog)
	}
};

/* This updates things that should be consistent with the button's appearance,
 * and update_button_state updates the button appearance itself
 */
static void update_button_display(ShowDesktopData* sdd)
{
	const char* tip;

	if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(sdd->button)))
	{
		tip = _("Click here to restore hidden windows.");
	}
	else
	{
		tip = _("Click here to hide all windows and show the desktop.");
	}

	gtk_widget_set_tooltip_text(sdd->button, tip);
}

static void update_button_state(ShowDesktopData* sdd)
{
	if (sdd->showing_desktop)
	{
		g_signal_handlers_block_by_func(G_OBJECT(sdd->button), G_CALLBACK(button_toggled_callback), sdd);
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(sdd->button), TRUE);
		g_signal_handlers_unblock_by_func(G_OBJECT(sdd->button), G_CALLBACK(button_toggled_callback), sdd);
	}
	else
	{
		g_signal_handlers_block_by_func(G_OBJECT(sdd->button), G_CALLBACK(button_toggled_callback), sdd);
		gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(sdd->button), FALSE);
		g_signal_handlers_unblock_by_func(G_OBJECT(sdd->button), G_CALLBACK(button_toggled_callback), sdd);
	}

	update_button_display (sdd);
}

static void applet_destroyed(GtkWidget* applet, ShowDesktopData* sdd)
{
	if (sdd->button_activate != 0)
	{
		g_source_remove(sdd->button_activate);
		sdd->button_activate = 0;
	}

	if (sdd->wnck_screen != NULL)
	{
		g_signal_handlers_disconnect_by_func(sdd->wnck_screen, show_desktop_changed_callback, sdd);
		sdd->wnck_screen = NULL;
	}

	if (sdd->icon_theme != NULL)
	{
		g_signal_handlers_disconnect_by_func(sdd->icon_theme, theme_changed_callback, sdd);
		sdd->icon_theme = NULL;
	}

	g_free (sdd);
}

static gboolean do_not_eat_button_press(GtkWidget* widget, GdkEventButton* event)
{
	if (event->button != 1)
	{
		g_signal_stop_emission_by_name(widget, "button_press_event");
	}

	return FALSE;
}

static gboolean button_motion_timeout(gpointer data)
{
	ShowDesktopData* sdd = (ShowDesktopData*) data;

	sdd->button_activate = 0;

	g_signal_emit_by_name(G_OBJECT(sdd->button), "clicked", sdd);

	return FALSE;
}

static void button_drag_leave(GtkWidget* widget, GdkDragContext* context, guint time, ShowDesktopData* sdd)
{
	if (sdd->button_activate != 0)
	{
		g_source_remove(sdd->button_activate);
		sdd->button_activate = 0;
	}
}

static gboolean button_drag_motion(GtkWidget* widget, GdkDragContext* context, gint x, gint y, guint time, ShowDesktopData* sdd)
{
	if (sdd->button_activate == 0)
		sdd->button_activate = g_timeout_add_seconds (TIMEOUT_ACTIVATE_SECONDS, button_motion_timeout, sdd);

	gdk_drag_status(context, 0, time);

	return TRUE;
}

static void show_desktop_applet_realized(MatePanelApplet* applet, gpointer data)
{
	ShowDesktopData* sdd;
	GdkScreen* screen;

	sdd = (ShowDesktopData*) data;

	if (sdd->wnck_screen != NULL)
		g_signal_handlers_disconnect_by_func(sdd->wnck_screen, show_desktop_changed_callback, sdd);

	if (sdd->icon_theme != NULL)
		g_signal_handlers_disconnect_by_func(sdd->icon_theme, theme_changed_callback, sdd);

	screen = gtk_widget_get_screen(sdd->applet);
	sdd->wnck_screen = wnck_screen_get(gdk_x11_screen_get_screen_number (screen));

	if (sdd->wnck_screen != NULL)
		wncklet_connect_while_alive(sdd->wnck_screen, "showing_desktop_changed", G_CALLBACK(show_desktop_changed_callback), sdd, sdd->applet);
	else
		g_warning("Could not get WnckScreen!");

	show_desktop_changed_callback(sdd->wnck_screen, sdd);

	sdd->icon_theme = gtk_icon_theme_get_for_screen (screen);
	wncklet_connect_while_alive(sdd->icon_theme, "changed", G_CALLBACK(theme_changed_callback), sdd, sdd->applet);

	update_icon (sdd);
}

static void theme_changed_callback(GtkIconTheme* icon_theme, ShowDesktopData* sdd)
{
	update_icon (sdd);
}

gboolean show_desktop_applet_fill(MatePanelApplet* applet)
{
	ShowDesktopData* sdd;
	GtkActionGroup* action_group;
	AtkObject* atk_obj;
	GtkCssProvider *provider;

	mate_panel_applet_set_flags(applet, MATE_PANEL_APPLET_EXPAND_MINOR);

	sdd = g_new0(ShowDesktopData, 1);

	sdd->applet = GTK_WIDGET(applet);

	sdd->image = gtk_image_new();

	switch (mate_panel_applet_get_orient(applet))
	{
		case MATE_PANEL_APPLET_ORIENT_LEFT:
		case MATE_PANEL_APPLET_ORIENT_RIGHT:
			sdd->orient = GTK_ORIENTATION_VERTICAL;
			break;
		case MATE_PANEL_APPLET_ORIENT_UP:
		case MATE_PANEL_APPLET_ORIENT_DOWN:
		default:
			sdd->orient = GTK_ORIENTATION_HORIZONTAL;
			break;
	}

	sdd->size = mate_panel_applet_get_size(MATE_PANEL_APPLET(sdd->applet));

	g_signal_connect(G_OBJECT(sdd->applet), "realize", G_CALLBACK(show_desktop_applet_realized), sdd);

	sdd->button = gtk_toggle_button_new ();

	gtk_widget_set_name (sdd->button, "showdesktop-button");
    provider = gtk_css_provider_new ();
	gtk_css_provider_load_from_data (provider,
					 "#showdesktop-button {\n"
                     "border-width: 0px; \n" /*a border here causes GTK warnings */
					 " padding: 0px;\n"
					 " margin: 0px; }",
					 -1, NULL);

	gtk_style_context_add_provider (gtk_widget_get_style_context (sdd->button),
					GTK_STYLE_PROVIDER (provider),
					GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
					g_object_unref (provider);

	atk_obj = gtk_widget_get_accessible(sdd->button);
	atk_object_set_name (atk_obj, _("Show Desktop Button"));
	g_signal_connect(G_OBJECT(sdd->button), "button_press_event", G_CALLBACK(do_not_eat_button_press), NULL);

	g_signal_connect(G_OBJECT(sdd->button), "toggled", G_CALLBACK(button_toggled_callback), sdd);

	gtk_container_set_border_width(GTK_CONTAINER(sdd->button), 0);
	gtk_container_add(GTK_CONTAINER(sdd->button), sdd->image);
	gtk_container_add(GTK_CONTAINER(sdd->applet), sdd->button);

	g_signal_connect (G_OBJECT(sdd->button), "size_allocate", G_CALLBACK(button_size_allocated), sdd);

	/* FIXME: Update this comment. */
	/* we have to bind change_orient before we do applet_widget_add
	   since we need to get an initial change_orient signal to set our
	   initial oriantation, and we get that during the _add call */
	g_signal_connect(G_OBJECT (sdd->applet), "change_orient", G_CALLBACK (applet_change_orient), sdd);

	mate_panel_applet_set_background_widget(MATE_PANEL_APPLET (sdd->applet), GTK_WIDGET(sdd->applet));

	action_group = gtk_action_group_new("ShowDesktop Applet Actions");
	gtk_action_group_set_translation_domain(action_group, GETTEXT_PACKAGE);
	gtk_action_group_add_actions(action_group, show_desktop_menu_actions, G_N_ELEMENTS (show_desktop_menu_actions), sdd);
	mate_panel_applet_setup_menu_from_resource (MATE_PANEL_APPLET (sdd->applet),
	                                            WNCKLET_RESOURCE_PATH "showdesktop-menu.xml",
	                                            action_group);
	g_object_unref(action_group);

	g_signal_connect(G_OBJECT(sdd->applet), "destroy", G_CALLBACK(applet_destroyed), sdd);

	gtk_drag_dest_set(GTK_WIDGET(sdd->button), 0, NULL, 0, 0);

	g_signal_connect(G_OBJECT(sdd->button), "drag_motion", G_CALLBACK (button_drag_motion), sdd);
	g_signal_connect(G_OBJECT(sdd->button), "drag_leave", G_CALLBACK (button_drag_leave), sdd);

	gtk_widget_show_all(sdd->applet);

	return TRUE;
}

static void display_help_dialog(GtkAction* action, ShowDesktopData* sdd)
{
	wncklet_display_help(sdd->applet, "mate-user-guide", "gospanel-564", SHOW_DESKTOP_ICON);
}

static void display_about_dialog(GtkAction* action, ShowDesktopData* sdd)
{
	static const gchar* authors[] = {
		"Perberos <perberos@gmail.com>",
		"Steve Zesch <stevezesch2@gmail.com>",
		"Stefano Karapetsas <stefano@karapetsas.com>",
		"Havoc Pennington <hp@redhat.com>",
		NULL
	};
	static const char* documenters[] = {
		"Sun GNOME Documentation Team <gdocteam@sun.com>",
		NULL
	};

	gtk_show_about_dialog(GTK_WINDOW(sdd->applet),
		"program-name", _("Show Desktop Button"),
		"title", _("About Show Desktop Button"),
		"authors", authors,
		"comments", _("This button lets you hide all windows and show the desktop."),
		"copyright", _("Copyright \xc2\xa9 2002 Red Hat, Inc.\n"
		               "Copyright \xc2\xa9 2011 Perberos\n"
                               "Copyright \xc2\xa9 2012-2020 MATE developers"),
		"documenters", documenters,
		"icon-name", SHOW_DESKTOP_ICON,
		"logo-icon-name", SHOW_DESKTOP_ICON,
		"translator-credits", _("translator-credits"),
		"version", VERSION,
		"website", "http://www.mate-desktop.org/",
		NULL);
}

static void button_toggled_callback(GtkWidget* button, ShowDesktopData* sdd)
{
	if (!gdk_x11_screen_supports_net_wm_hint(gtk_widget_get_screen(button), gdk_atom_intern("_NET_SHOWING_DESKTOP", FALSE)))
	{
		static GtkWidget* dialog = NULL;

		if (dialog && gtk_widget_get_screen(dialog) != gtk_widget_get_screen(button))
			gtk_widget_destroy (dialog);

		if (dialog)
		{
			gtk_window_present(GTK_WINDOW(dialog));
			return;
		}

		dialog = gtk_message_dialog_new(NULL, GTK_DIALOG_MODAL, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, _("Your window manager does not support the show desktop button, or you are not running a window manager."));

		g_object_add_weak_pointer(G_OBJECT(dialog), (gpointer) &dialog);

		g_signal_connect(G_OBJECT(dialog), "response", G_CALLBACK(gtk_widget_destroy), NULL);

		gtk_window_set_resizable(GTK_WINDOW(dialog), FALSE);
		gtk_window_set_screen(GTK_WINDOW(dialog), gtk_widget_get_screen(button));
		gtk_widget_show(dialog);

		return;
	}

	if (sdd->wnck_screen != NULL)
		wnck_screen_toggle_showing_desktop(sdd->wnck_screen, gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button)));

	update_button_display (sdd);
}

static void show_desktop_changed_callback(WnckScreen* screen, ShowDesktopData* sdd)
{
	if (sdd->wnck_screen != NULL)
		sdd->showing_desktop = wnck_screen_get_showing_desktop(sdd->wnck_screen);

	update_button_state (sdd);
}