aboutsummaryrefslogtreecommitdiff
path: root/libindicator/indicator-object.c
blob: 511a4072064f0632e123081f7490cd756fea198f (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
/*
An object to represent loadable indicator modules to make loading
them easy and objectified.

Copyright 2009 Canonical Ltd.

Authors:
    Ted Gould <ted@canonical.com>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 3.0 as published by the Free Software Foundation.

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 General Public License version 3.0 for more details.

You should have received a copy of the GNU General Public
License along with this library. If not, see
<http://www.gnu.org/licenses/>.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "indicator.h"
#include "indicator-object.h"
#include "indicator-object-marshal.h"
#include "indicator-object-enum-types.h"

/**
	IndicatorObjectPrivate:
	@module: The loaded module representing the object.  Note to
		subclasses: This will not be set when you're initalized.
	@entry: A default entry for objects that don't need all the
		fancy stuff.  This works with #get_entries_default.
	@gotten_entries: A check to see if the @entry has been
		populated intelligently yet.

	Structure to define the memory for the private area
	of the object instance.
*/
struct _IndicatorObjectPrivate {
	GModule * module;

	/* For get_entries_default */
	IndicatorObjectEntry entry;
	gboolean gotten_entries;
};

#define INDICATOR_OBJECT_GET_PRIVATE(o) (INDICATOR_OBJECT(o)->priv)

/* Signals Stuff */
enum {
	ENTRY_ADDED,
	ENTRY_REMOVED,
	ENTRY_MOVED,
        SCROLL,
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

/* GObject stuff */
static void indicator_object_class_init (IndicatorObjectClass *klass);
static void indicator_object_init       (IndicatorObject *self);
static void indicator_object_dispose    (GObject *object);
static void indicator_object_finalize   (GObject *object);

static GList * get_entries_default (IndicatorObject * io);

G_DEFINE_TYPE (IndicatorObject, indicator_object, G_TYPE_OBJECT);

/* Setup the class and put the functions into the
   class structure */
static void
indicator_object_class_init (IndicatorObjectClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	g_type_class_add_private (klass, sizeof (IndicatorObjectPrivate));

	object_class->dispose = indicator_object_dispose;
	object_class->finalize = indicator_object_finalize;

	klass->get_label =  NULL;
	klass->get_menu =   NULL;
	klass->get_image =  NULL;

	klass->get_entries = get_entries_default;
	klass->get_location = NULL;

	/**
		IndicatorObject::entry-added:
		@arg0: The #IndicatorObject object
		@arg1: A pointer to the #IndicatorObjectEntry that
			is being added.

		Signaled when a new entry is added and should
		be shown by the person using this object.
	*/
	signals[ENTRY_ADDED] = g_signal_new (INDICATOR_OBJECT_SIGNAL_ENTRY_ADDED,
	                                     G_TYPE_FROM_CLASS(klass),
	                                     G_SIGNAL_RUN_LAST,
	                                     G_STRUCT_OFFSET (IndicatorObjectClass, entry_added),
	                                     NULL, NULL,
	                                     g_cclosure_marshal_VOID__POINTER,
	                                     G_TYPE_NONE, 1, G_TYPE_POINTER, G_TYPE_NONE);

	/**
		IndicatorObject::entry-removed:
		@arg0: The #IndicatorObject object
		@arg1: A pointer to the #IndicatorObjectEntry that
			is being removed.

		Signaled when an entry is removed and should
		be removed by the person using this object.
	*/
	signals[ENTRY_REMOVED] = g_signal_new (INDICATOR_OBJECT_SIGNAL_ENTRY_REMOVED,
	                                       G_TYPE_FROM_CLASS(klass),
	                                       G_SIGNAL_RUN_LAST,
	                                       G_STRUCT_OFFSET (IndicatorObjectClass, entry_removed),
	                                       NULL, NULL,
	                                       g_cclosure_marshal_VOID__POINTER,
	                                       G_TYPE_NONE, 1, G_TYPE_POINTER, G_TYPE_NONE);
	/**
		IndicatorObject::entry-moved:
		@arg0: The #IndicatorObject object
		@arg1: A pointer to the #IndicatorObjectEntry that
			is being moved.
		@arg2: The old location of the entry
		@arg3: The new location of the entry

		When the order of the entries change, then this signal
		is sent to tell the new location.
	*/
	signals[ENTRY_MOVED] = g_signal_new (INDICATOR_OBJECT_SIGNAL_ENTRY_MOVED,
	                                     G_TYPE_FROM_CLASS(klass),
	                                     G_SIGNAL_RUN_LAST,
	                                     G_STRUCT_OFFSET (IndicatorObjectClass, entry_moved),
	                                     NULL, NULL,
	                                     _indicator_object_marshal_VOID__POINTER_UINT_UINT,
	                                     G_TYPE_NONE, 3, G_TYPE_POINTER, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_NONE);


        /**
                IndicatorObject::scroll:
                @arg0: The #IndicatorObject object
                @arg1: The delta of the scroll event
                @arg2: The orientation of the scroll event.

                When the indicator receives a mouse scroll wheel event
                from the user, this signal is emitted.
         */
        signals[SCROLL] = g_signal_new (INDICATOR_OBJECT_SIGNAL_SCROLL,
                                        G_TYPE_FROM_CLASS(klass),
                                        G_SIGNAL_RUN_LAST,
                                        G_STRUCT_OFFSET (IndicatorObjectClass, scroll),
                                        NULL, NULL,
                                        _indicator_object_marshal_VOID__UINT_ENUM,
                                        G_TYPE_NONE, 2, G_TYPE_UINT, INDICATOR_OBJECT_TYPE_SCROLL_DIRECTION);


	return;
}

/* Initialize an instance */
static void
indicator_object_init (IndicatorObject *self)
{
	self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, INDICATOR_OBJECT_TYPE, IndicatorObjectPrivate);

	self->priv->module = NULL;

	self->priv->entry.menu = NULL;
	self->priv->entry.label = NULL;
	self->priv->entry.image = NULL;

	self->priv->gotten_entries = FALSE;

	return;
}

/* Unref the objects that we're holding on to. */
static void
indicator_object_dispose (GObject *object)
{

	G_OBJECT_CLASS (indicator_object_parent_class)->dispose (object);
	return;
}

/* A small helper function that closes a module but
   in the function prototype of a GSourceFunc. */
static gboolean
module_unref (gpointer data)
{
	if (!g_module_close((GModule *)data)) {
		/* All we can do is warn. */
		g_warning("Unable to close module!");
	}
	return FALSE;
}

/* Free memory */
static void
indicator_object_finalize (GObject *object)
{
	IndicatorObjectPrivate * priv = INDICATOR_OBJECT_GET_PRIVATE(object);

	if (priv->module != NULL) {
		/* Wow, this is convoluted.  So basically we want to unref
		   the module which will cause the code it included to be
		   removed.  But, since it's finalize function is the function
		   that called this one, we can't really remove it before
		   it finishes being executed.  So we're putting the job into
		   the main loop to remove it the next time it gets a chance.
		   Slightly non-deterministic, but should work. */
		g_idle_add(module_unref, priv->module);
		priv->module = NULL;
	}

	G_OBJECT_CLASS (indicator_object_parent_class)->finalize (object);
	return;
}

/**
	indicator_object_new_from_file:
	@file: Filename containing a loadable module

	This function builds an #IndicatorObject using the symbols
	that are found in @file.  The module is loaded and the
	references are all kept by the object.  To unload the
	module the object must be destroyed.

	Return value: A valid #IndicatorObject or #NULL if error.
*/
IndicatorObject *
indicator_object_new_from_file (const gchar * file)
{
	GObject * object = NULL;
	GModule * module = NULL;

	/* Check to make sure the name exists and that the
	   file itself exists */
	if (file == NULL) {
		g_warning("Invalid filename.");
		return NULL;
	}

	if (!g_file_test(file, G_FILE_TEST_EXISTS)) {
		g_warning("File '%s' does not exist.", file);
		return NULL;
	}

	/* Grab the g_module reference, pull it in but let's
	   keep the symbols local to avoid conflicts. */
	module = g_module_open(file,
                           G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
	if (module == NULL) {
		g_warning("Unable to load module: %s", file);
		return NULL;
	}

	/* Look for the version function, error if not found. */
	get_version_t lget_version = NULL;
	if (!g_module_symbol(module, INDICATOR_GET_VERSION_S, (gpointer *)(&lget_version))) {
		g_warning("Unable to get the symbol for getting the version.");
		return NULL;
	}

	/* Check the version with the macro and make sure we're
	   all talking the same language. */
	if (!INDICATOR_VERSION_CHECK(lget_version())) {
		g_warning("Indicator using API version '%s' we're expecting '%s'", lget_version(), INDICATOR_VERSION);
		return NULL;
	}

	/* The function for grabbing a label from the module
	   execute it, and make sure everything is a-okay */
	get_type_t lget_type = NULL;
	if (!g_module_symbol(module, INDICATOR_GET_TYPE_S, (gpointer *)(&lget_type))) {
		g_warning("Unable to get '" INDICATOR_GET_TYPE_S "' symbol from module: %s", file);
		goto unrefandout;
	}
	if (lget_type == NULL) {
		g_warning("Symbol '" INDICATOR_GET_TYPE_S "' is (null) in module: %s", file);
		goto unrefandout;
	}

	/* A this point we allocate the object, any code beyond
	   here needs to deallocate it if we're returning in an
	   error'd state. */
	object = g_object_new(lget_type(), NULL);
	if (object == NULL) {
		g_warning("Unable to build an object if type '%d' in module: %s", (gint)lget_type(), file);
		goto unrefandout;
	}
	if (!INDICATOR_IS_OBJECT(object)) {
		g_warning("Type '%d' in file %s is not a subclass of IndicatorObject.", (gint)lget_type(), file);
		goto unrefandout;
	}

	IndicatorObjectPrivate * priv = INDICATOR_OBJECT_GET_PRIVATE(object);
	/* Now we can track the module */
	priv->module = module;

	return INDICATOR_OBJECT(object);

	/* Error, let's drop the object and return NULL.  Sad when
	   this happens. */
unrefandout:
	if (object != NULL) {
		g_object_unref(object);
	}
	if (module != NULL) {
		g_object_unref(module);
	}
	g_warning("Error building IndicatorObject from file: %s", file);
	return NULL;
}

/* The default get entries function uses the other single
   entries in the class to create an entry structure and
   put it into a list.  This makes it simple for simple objects
   to create the list.  Small changes from the way they
   previously were. */
static GList *
get_entries_default (IndicatorObject * io)
{
	IndicatorObjectPrivate * priv = INDICATOR_OBJECT_GET_PRIVATE(io);

	if (!priv->gotten_entries) {
		IndicatorObjectClass * class = INDICATOR_OBJECT_GET_CLASS(io);

		if (class->get_label) {
			priv->entry.label = class->get_label(io);
		}

		if (class->get_image) {
			priv->entry.image = class->get_image(io);
		}

		if (priv->entry.image == NULL && priv->entry.label == NULL) {
			g_warning("IndicatorObject class does not create an image or a label.  We need one of those.");
			return NULL;
		}

		if (class->get_menu) {
			priv->entry.menu = class->get_menu(io);
		}

		if (priv->entry.menu == NULL) {
			g_warning("IndicatorObject class does not create a menu.  We need one of those.");
			return NULL;
		}

		priv->gotten_entries = TRUE;
	}

	return g_list_append(NULL, &(priv->entry));
}

/**
	indicator_object_get_entires:
	@io: #IndicatorObject to query

	This function looks on the class for the object and calls
	it's #IndicatorObjectClass::get_entries function.  The
	list should be owned by the caller, but the individual
	enteries should not be.

	Return value: A list if #IndicatorObjectEntry structures or
		NULL if there is an error.
*/
GList *
indicator_object_get_entries (IndicatorObject * io)
{
	g_return_val_if_fail(INDICATOR_IS_OBJECT(io), NULL);
	IndicatorObjectClass * class = INDICATOR_OBJECT_GET_CLASS(io);

	if (class->get_entries) {
		return class->get_entries(io);
	}

	g_error("No get_entries function on object.  It must have been deleted?!?!");
	return NULL;
}

/**
	indicator_object_get_location:
	@io: #IndicatorObject to query
	@entry: The #IndicatorObjectEntry to look for.

	This function looks on the class for the object and calls
	it's #IndicatorObjectClass::get_location function.  If the
	function doesn't exist it returns zero.

	Return value: Location of the @entry in the display or
		zero if no location is specified.
*/
guint
indicator_object_get_location (IndicatorObject * io, IndicatorObjectEntry * entry)
{
	g_return_val_if_fail(INDICATOR_IS_OBJECT(io), 0);
	IndicatorObjectClass * class = INDICATOR_OBJECT_GET_CLASS(io);

	if (class->get_location) {
		return class->get_location(io, entry);
	}

	return 0;
}