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1 | /* |
2 | * gtkpanel.c - implementation of the `Panels' GTK layout container. |
3 | */ |
4 | |
5 | #include "gtkpanel.h" |
6 | |
7 | static void panels_init(Panels *panels); |
8 | static void panels_class_init(PanelsClass *klass); |
9 | static void panels_map(GtkWidget *widget); |
10 | static void panels_unmap(GtkWidget *widget); |
11 | static void panels_draw(GtkWidget *widget, GdkRectangle *area); |
12 | static gint panels_expose(GtkWidget *widget, GdkEventExpose *event); |
13 | static void panels_base_add(GtkContainer *container, GtkWidget *widget); |
14 | static void panels_remove(GtkContainer *container, GtkWidget *widget); |
15 | static void panels_forall(GtkContainer *container, gboolean include_internals, |
16 | GtkCallback callback, gpointer callback_data); |
17 | static GtkType panels_child_type(GtkContainer *container); |
18 | static void panels_size_request(GtkWidget *widget, GtkRequisition *req); |
19 | static void panels_size_allocate(GtkWidget *widget, GtkAllocation *alloc); |
20 | |
21 | static GtkContainerClass *parent_class = NULL; |
22 | |
23 | GtkType panels_get_type(void) |
24 | { |
25 | static GtkType panels_type = 0; |
26 | |
27 | if (!panels_type) { |
28 | static const GtkTypeInfo panels_info = { |
29 | "Panels", |
30 | sizeof(Panels), |
31 | sizeof(PanelsClass), |
32 | (GtkClassInitFunc) panels_class_init, |
33 | (GtkObjectInitFunc) panels_init, |
34 | /* reserved_1 */ NULL, |
35 | /* reserved_2 */ NULL, |
36 | (GtkClassInitFunc) NULL, |
37 | }; |
38 | |
39 | panels_type = gtk_type_unique(GTK_TYPE_CONTAINER, &panels_info); |
40 | } |
41 | |
42 | return panels_type; |
43 | } |
44 | |
45 | static void panels_class_init(PanelsClass *klass) |
46 | { |
47 | GtkObjectClass *object_class; |
48 | GtkWidgetClass *widget_class; |
49 | GtkContainerClass *container_class; |
50 | |
51 | object_class = (GtkObjectClass *)klass; |
52 | widget_class = (GtkWidgetClass *)klass; |
53 | container_class = (GtkContainerClass *)klass; |
54 | |
55 | parent_class = gtk_type_class(GTK_TYPE_CONTAINER); |
56 | |
57 | /* |
58 | * FIXME: do we have to do all this faffing with set_arg, |
59 | * get_arg and child_arg_type? Ick. |
60 | */ |
61 | |
62 | widget_class->map = panels_map; |
63 | widget_class->unmap = panels_unmap; |
64 | widget_class->draw = panels_draw; |
65 | widget_class->expose_event = panels_expose; |
66 | widget_class->size_request = panels_size_request; |
67 | widget_class->size_allocate = panels_size_allocate; |
68 | |
69 | container_class->add = panels_base_add; |
70 | container_class->remove = panels_remove; |
71 | container_class->forall = panels_forall; |
72 | container_class->child_type = panels_child_type; |
73 | } |
74 | |
75 | static void panels_init(Panels *panels) |
76 | { |
77 | GTK_WIDGET_SET_FLAGS(panels, GTK_NO_WINDOW); |
78 | |
79 | panels->children = NULL; |
80 | } |
81 | |
82 | /* |
83 | * These appear to be thoroughly tedious functions; the only reason |
84 | * we have to reimplement them at all is because we defined our own |
85 | * format for our GList of children... |
86 | */ |
87 | static void panels_map(GtkWidget *widget) |
88 | { |
89 | Panels *panels; |
90 | GtkWidget *child; |
91 | GList *children; |
92 | |
93 | g_return_if_fail(widget != NULL); |
94 | g_return_if_fail(IS_PANELS(widget)); |
95 | |
96 | panels = PANELS(widget); |
97 | GTK_WIDGET_SET_FLAGS(panels, GTK_MAPPED); |
98 | |
99 | for (children = panels->children; |
100 | children && (child = children->data); |
101 | children = children->next) { |
102 | if (child && |
103 | GTK_WIDGET_VISIBLE(child) && |
104 | !GTK_WIDGET_MAPPED(child)) |
105 | gtk_widget_map(child); |
106 | } |
107 | } |
108 | static void panels_unmap(GtkWidget *widget) |
109 | { |
110 | Panels *panels; |
111 | GtkWidget *child; |
112 | GList *children; |
113 | |
114 | g_return_if_fail(widget != NULL); |
115 | g_return_if_fail(IS_PANELS(widget)); |
116 | |
117 | panels = PANELS(widget); |
118 | GTK_WIDGET_UNSET_FLAGS(panels, GTK_MAPPED); |
119 | |
120 | for (children = panels->children; |
121 | children && (child = children->data); |
122 | children = children->next) { |
123 | if (child && |
124 | GTK_WIDGET_VISIBLE(child) && |
125 | GTK_WIDGET_MAPPED(child)) |
126 | gtk_widget_unmap(child); |
127 | } |
128 | } |
129 | static void panels_draw(GtkWidget *widget, GdkRectangle *area) |
130 | { |
131 | Panels *panels; |
132 | GtkWidget *child; |
133 | GList *children; |
134 | GdkRectangle child_area; |
135 | |
136 | g_return_if_fail(widget != NULL); |
137 | g_return_if_fail(IS_PANELS(widget)); |
138 | |
139 | if (GTK_WIDGET_DRAWABLE(widget)) { |
140 | panels = PANELS(widget); |
141 | |
142 | for (children = panels->children; |
143 | children && (child = children->data); |
144 | children = children->next) { |
145 | if (child && |
146 | GTK_WIDGET_DRAWABLE(child) && |
147 | gtk_widget_intersect(child, area, &child_area)) |
148 | gtk_widget_draw(child, &child_area); |
149 | } |
150 | } |
151 | } |
152 | static gint panels_expose(GtkWidget *widget, GdkEventExpose *event) |
153 | { |
154 | Panels *panels; |
155 | GtkWidget *child; |
156 | GList *children; |
157 | GdkEventExpose child_event; |
158 | |
159 | g_return_val_if_fail(widget != NULL, FALSE); |
160 | g_return_val_if_fail(IS_PANELS(widget), FALSE); |
161 | g_return_val_if_fail(event != NULL, FALSE); |
162 | |
163 | if (GTK_WIDGET_DRAWABLE(widget)) { |
164 | panels = PANELS(widget); |
165 | child_event = *event; |
166 | |
167 | for (children = panels->children; |
168 | children && (child = children->data); |
169 | children = children->next) { |
170 | if (child && |
171 | GTK_WIDGET_DRAWABLE(child) && |
172 | GTK_WIDGET_NO_WINDOW(child) && |
173 | gtk_widget_intersect(child, &event->area, |
174 | &child_event.area)) |
175 | gtk_widget_event(child, (GdkEvent *)&child_event); |
176 | } |
177 | } |
178 | return FALSE; |
179 | } |
180 | |
181 | static void panels_base_add(GtkContainer *container, GtkWidget *widget) |
182 | { |
183 | Panels *panels; |
184 | |
185 | g_return_if_fail(container != NULL); |
186 | g_return_if_fail(IS_PANELS(container)); |
187 | g_return_if_fail(widget != NULL); |
188 | |
189 | panels = PANELS(container); |
190 | |
191 | panels_add(panels, widget); |
192 | } |
193 | |
194 | static void panels_remove(GtkContainer *container, GtkWidget *widget) |
195 | { |
196 | Panels *panels; |
197 | GtkWidget *child; |
198 | GList *children; |
199 | gboolean was_visible; |
200 | |
201 | g_return_if_fail(container != NULL); |
202 | g_return_if_fail(IS_PANELS(container)); |
203 | g_return_if_fail(widget != NULL); |
204 | |
205 | panels = PANELS(container); |
206 | |
207 | for (children = panels->children; |
208 | children && (child = children->data); |
209 | children = children->next) { |
210 | if (child != widget) |
211 | continue; |
212 | |
213 | was_visible = GTK_WIDGET_VISIBLE(widget); |
214 | gtk_widget_unparent(widget); |
215 | panels->children = g_list_remove_link(panels->children, children); |
216 | g_list_free(children); |
217 | if (was_visible) |
218 | gtk_widget_queue_resize(GTK_WIDGET(container)); |
219 | break; |
220 | } |
221 | } |
222 | |
223 | static void panels_forall(GtkContainer *container, gboolean include_internals, |
224 | GtkCallback callback, gpointer callback_data) |
225 | { |
226 | Panels *panels; |
227 | GtkWidget *child; |
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228 | GList *children, *next; |
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229 | |
230 | g_return_if_fail(container != NULL); |
231 | g_return_if_fail(IS_PANELS(container)); |
232 | g_return_if_fail(callback != NULL); |
233 | |
234 | panels = PANELS(container); |
235 | |
236 | for (children = panels->children; |
237 | children && (child = children->data); |
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238 | children = next) { |
239 | /* |
240 | * We can't wait until after the callback to assign |
241 | * `children = children->next', because the callback might |
242 | * be gtk_widget_destroy, which would remove the link |
243 | * `children' from the list! So instead we must get our |
244 | * hands on the value of the `next' pointer _before_ the |
245 | * callback. |
246 | */ |
247 | next = children->next; |
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248 | if (child) |
249 | callback(child, callback_data); |
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250 | } |
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251 | } |
252 | |
253 | static GtkType panels_child_type(GtkContainer *container) |
254 | { |
255 | return GTK_TYPE_WIDGET; |
256 | } |
257 | |
258 | GtkWidget *panels_new(void) |
259 | { |
260 | Panels *panels; |
261 | |
262 | panels = gtk_type_new(panels_get_type()); |
263 | |
264 | return GTK_WIDGET(panels); |
265 | } |
266 | |
267 | void panels_add(Panels *panels, GtkWidget *child) |
268 | { |
269 | g_return_if_fail(panels != NULL); |
270 | g_return_if_fail(IS_PANELS(panels)); |
271 | g_return_if_fail(child != NULL); |
272 | g_return_if_fail(child->parent == NULL); |
273 | |
274 | panels->children = g_list_append(panels->children, child); |
275 | |
276 | gtk_widget_set_parent(child, GTK_WIDGET(panels)); |
277 | |
278 | if (GTK_WIDGET_REALIZED(panels)) |
279 | gtk_widget_realize(child); |
280 | |
281 | if (GTK_WIDGET_VISIBLE(panels)) { |
282 | if (GTK_WIDGET_MAPPED(panels)) |
283 | gtk_widget_map(child); |
284 | gtk_widget_queue_resize(child); |
285 | } |
286 | } |
287 | |
288 | void panels_switch_to(Panels *panels, GtkWidget *target) |
289 | { |
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290 | GtkWidget *child = NULL; |
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291 | GList *children; |
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292 | gboolean changed = FALSE; |
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293 | |
294 | g_return_if_fail(panels != NULL); |
295 | g_return_if_fail(IS_PANELS(panels)); |
296 | g_return_if_fail(target != NULL); |
297 | g_return_if_fail(target->parent == GTK_WIDGET(panels)); |
298 | |
299 | for (children = panels->children; |
300 | children && (child = children->data); |
301 | children = children->next) { |
302 | |
303 | if (!child) |
304 | continue; |
305 | |
306 | if (child == target) { |
307 | if (!GTK_WIDGET_VISIBLE(child)) { |
308 | gtk_widget_show(child); |
309 | changed = TRUE; |
310 | } |
311 | } else { |
312 | if (GTK_WIDGET_VISIBLE(child)) { |
313 | gtk_widget_hide(child); |
314 | changed = TRUE; |
315 | } |
316 | } |
317 | } |
318 | if (changed) |
319 | gtk_widget_queue_resize(child); |
320 | } |
321 | |
322 | /* |
323 | * Now here comes the interesting bit. The actual layout part is |
324 | * done in the following two functions: |
325 | * |
326 | * panels_size_request() examines the list of widgets held in the |
327 | * Panels, and returns a requisition stating the absolute minimum |
328 | * size it can bear to be. |
329 | * |
330 | * panels_size_allocate() is given an allocation telling it what |
331 | * size the whole container is going to be, and it calls |
332 | * gtk_widget_size_allocate() on all of its (visible) children to |
333 | * set their size and position relative to the top left of the |
334 | * container. |
335 | */ |
336 | |
337 | static void panels_size_request(GtkWidget *widget, GtkRequisition *req) |
338 | { |
339 | Panels *panels; |
340 | GtkWidget *child; |
341 | GList *children; |
342 | |
343 | g_return_if_fail(widget != NULL); |
344 | g_return_if_fail(IS_PANELS(widget)); |
345 | g_return_if_fail(req != NULL); |
346 | |
347 | panels = PANELS(widget); |
348 | |
349 | req->width = 0; |
350 | req->height = 0; |
351 | |
352 | for (children = panels->children; |
353 | children && (child = children->data); |
354 | children = children->next) { |
355 | GtkRequisition creq; |
356 | |
357 | gtk_widget_size_request(child, &creq); |
358 | if (req->width < creq.width) |
359 | req->width = creq.width; |
360 | if (req->height < creq.height) |
361 | req->height = creq.height; |
362 | } |
363 | |
364 | req->width += 2*GTK_CONTAINER(panels)->border_width; |
365 | req->height += 2*GTK_CONTAINER(panels)->border_width; |
366 | } |
367 | |
368 | static void panels_size_allocate(GtkWidget *widget, GtkAllocation *alloc) |
369 | { |
370 | Panels *panels; |
371 | GtkWidget *child; |
372 | GList *children; |
373 | gint border; |
374 | |
375 | g_return_if_fail(widget != NULL); |
376 | g_return_if_fail(IS_PANELS(widget)); |
377 | g_return_if_fail(alloc != NULL); |
378 | |
379 | panels = PANELS(widget); |
380 | widget->allocation = *alloc; |
381 | border = GTK_CONTAINER(panels)->border_width; |
382 | |
383 | for (children = panels->children; |
384 | children && (child = children->data); |
385 | children = children->next) { |
386 | GtkAllocation call; |
387 | |
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388 | call.x = alloc->x + border; |
389 | call.width = alloc->width - 2*border; |
390 | call.y = alloc->y + border; |
391 | call.height = alloc->height - 2*border; |
392 | |
393 | gtk_widget_size_allocate(child, &call); |
394 | } |
395 | } |