| 1 | /* |
| 2 | * gtkcols.c - implementation of the `Columns' GTK layout container. |
| 3 | */ |
| 4 | |
| 5 | #include "gtkcols.h" |
| 6 | |
| 7 | static void columns_init(Columns *cols); |
| 8 | static void columns_class_init(ColumnsClass *klass); |
| 9 | static void columns_map(GtkWidget *widget); |
| 10 | static void columns_unmap(GtkWidget *widget); |
| 11 | static void columns_draw(GtkWidget *widget, GdkRectangle *area); |
| 12 | static gint columns_expose(GtkWidget *widget, GdkEventExpose *event); |
| 13 | static void columns_base_add(GtkContainer *container, GtkWidget *widget); |
| 14 | static void columns_remove(GtkContainer *container, GtkWidget *widget); |
| 15 | static void columns_forall(GtkContainer *container, gboolean include_internals, |
| 16 | GtkCallback callback, gpointer callback_data); |
| 17 | static gint columns_focus(GtkContainer *container, GtkDirectionType dir); |
| 18 | static GtkType columns_child_type(GtkContainer *container); |
| 19 | static void columns_size_request(GtkWidget *widget, GtkRequisition *req); |
| 20 | static void columns_size_allocate(GtkWidget *widget, GtkAllocation *alloc); |
| 21 | |
| 22 | static GtkContainerClass *parent_class = NULL; |
| 23 | |
| 24 | GtkType columns_get_type(void) |
| 25 | { |
| 26 | static GtkType columns_type = 0; |
| 27 | |
| 28 | if (!columns_type) { |
| 29 | static const GtkTypeInfo columns_info = { |
| 30 | "Columns", |
| 31 | sizeof(Columns), |
| 32 | sizeof(ColumnsClass), |
| 33 | (GtkClassInitFunc) columns_class_init, |
| 34 | (GtkObjectInitFunc) columns_init, |
| 35 | /* reserved_1 */ NULL, |
| 36 | /* reserved_2 */ NULL, |
| 37 | (GtkClassInitFunc) NULL, |
| 38 | }; |
| 39 | |
| 40 | columns_type = gtk_type_unique(GTK_TYPE_CONTAINER, &columns_info); |
| 41 | } |
| 42 | |
| 43 | return columns_type; |
| 44 | } |
| 45 | |
| 46 | static gint (*columns_inherited_focus)(GtkContainer *container, |
| 47 | GtkDirectionType direction); |
| 48 | |
| 49 | static void columns_class_init(ColumnsClass *klass) |
| 50 | { |
| 51 | GtkObjectClass *object_class; |
| 52 | GtkWidgetClass *widget_class; |
| 53 | GtkContainerClass *container_class; |
| 54 | |
| 55 | object_class = (GtkObjectClass *)klass; |
| 56 | widget_class = (GtkWidgetClass *)klass; |
| 57 | container_class = (GtkContainerClass *)klass; |
| 58 | |
| 59 | parent_class = gtk_type_class(GTK_TYPE_CONTAINER); |
| 60 | |
| 61 | /* |
| 62 | * FIXME: do we have to do all this faffing with set_arg, |
| 63 | * get_arg and child_arg_type? Ick. |
| 64 | */ |
| 65 | |
| 66 | widget_class->map = columns_map; |
| 67 | widget_class->unmap = columns_unmap; |
| 68 | widget_class->draw = columns_draw; |
| 69 | widget_class->expose_event = columns_expose; |
| 70 | widget_class->size_request = columns_size_request; |
| 71 | widget_class->size_allocate = columns_size_allocate; |
| 72 | |
| 73 | container_class->add = columns_base_add; |
| 74 | container_class->remove = columns_remove; |
| 75 | container_class->forall = columns_forall; |
| 76 | container_class->child_type = columns_child_type; |
| 77 | /* Save the previous value of this method. */ |
| 78 | if (!columns_inherited_focus) |
| 79 | columns_inherited_focus = container_class->focus; |
| 80 | container_class->focus = columns_focus; |
| 81 | } |
| 82 | |
| 83 | static void columns_init(Columns *cols) |
| 84 | { |
| 85 | GTK_WIDGET_SET_FLAGS(cols, GTK_NO_WINDOW); |
| 86 | |
| 87 | cols->children = NULL; |
| 88 | cols->spacing = 0; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * These appear to be thoroughly tedious functions; the only reason |
| 93 | * we have to reimplement them at all is because we defined our own |
| 94 | * format for our GList of children... |
| 95 | */ |
| 96 | static void columns_map(GtkWidget *widget) |
| 97 | { |
| 98 | Columns *cols; |
| 99 | ColumnsChild *child; |
| 100 | GList *children; |
| 101 | |
| 102 | g_return_if_fail(widget != NULL); |
| 103 | g_return_if_fail(IS_COLUMNS(widget)); |
| 104 | |
| 105 | cols = COLUMNS(widget); |
| 106 | GTK_WIDGET_SET_FLAGS(cols, GTK_MAPPED); |
| 107 | |
| 108 | for (children = cols->children; |
| 109 | children && (child = children->data); |
| 110 | children = children->next) { |
| 111 | if (child->widget && |
| 112 | GTK_WIDGET_VISIBLE(child->widget) && |
| 113 | !GTK_WIDGET_MAPPED(child->widget)) |
| 114 | gtk_widget_map(child->widget); |
| 115 | } |
| 116 | } |
| 117 | static void columns_unmap(GtkWidget *widget) |
| 118 | { |
| 119 | Columns *cols; |
| 120 | ColumnsChild *child; |
| 121 | GList *children; |
| 122 | |
| 123 | g_return_if_fail(widget != NULL); |
| 124 | g_return_if_fail(IS_COLUMNS(widget)); |
| 125 | |
| 126 | cols = COLUMNS(widget); |
| 127 | GTK_WIDGET_UNSET_FLAGS(cols, GTK_MAPPED); |
| 128 | |
| 129 | for (children = cols->children; |
| 130 | children && (child = children->data); |
| 131 | children = children->next) { |
| 132 | if (child->widget && |
| 133 | GTK_WIDGET_VISIBLE(child->widget) && |
| 134 | GTK_WIDGET_MAPPED(child->widget)) |
| 135 | gtk_widget_unmap(child->widget); |
| 136 | } |
| 137 | } |
| 138 | static void columns_draw(GtkWidget *widget, GdkRectangle *area) |
| 139 | { |
| 140 | Columns *cols; |
| 141 | ColumnsChild *child; |
| 142 | GList *children; |
| 143 | GdkRectangle child_area; |
| 144 | |
| 145 | g_return_if_fail(widget != NULL); |
| 146 | g_return_if_fail(IS_COLUMNS(widget)); |
| 147 | |
| 148 | if (GTK_WIDGET_DRAWABLE(widget)) { |
| 149 | cols = COLUMNS(widget); |
| 150 | |
| 151 | for (children = cols->children; |
| 152 | children && (child = children->data); |
| 153 | children = children->next) { |
| 154 | if (child->widget && |
| 155 | GTK_WIDGET_DRAWABLE(child->widget) && |
| 156 | gtk_widget_intersect(child->widget, area, &child_area)) |
| 157 | gtk_widget_draw(child->widget, &child_area); |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | static gint columns_expose(GtkWidget *widget, GdkEventExpose *event) |
| 162 | { |
| 163 | Columns *cols; |
| 164 | ColumnsChild *child; |
| 165 | GList *children; |
| 166 | GdkEventExpose child_event; |
| 167 | |
| 168 | g_return_val_if_fail(widget != NULL, FALSE); |
| 169 | g_return_val_if_fail(IS_COLUMNS(widget), FALSE); |
| 170 | g_return_val_if_fail(event != NULL, FALSE); |
| 171 | |
| 172 | if (GTK_WIDGET_DRAWABLE(widget)) { |
| 173 | cols = COLUMNS(widget); |
| 174 | child_event = *event; |
| 175 | |
| 176 | for (children = cols->children; |
| 177 | children && (child = children->data); |
| 178 | children = children->next) { |
| 179 | if (child->widget && |
| 180 | GTK_WIDGET_DRAWABLE(child->widget) && |
| 181 | GTK_WIDGET_NO_WINDOW(child->widget) && |
| 182 | gtk_widget_intersect(child->widget, &event->area, |
| 183 | &child_event.area)) |
| 184 | gtk_widget_event(child->widget, (GdkEvent *)&child_event); |
| 185 | } |
| 186 | } |
| 187 | return FALSE; |
| 188 | } |
| 189 | |
| 190 | static void columns_base_add(GtkContainer *container, GtkWidget *widget) |
| 191 | { |
| 192 | Columns *cols; |
| 193 | |
| 194 | g_return_if_fail(container != NULL); |
| 195 | g_return_if_fail(IS_COLUMNS(container)); |
| 196 | g_return_if_fail(widget != NULL); |
| 197 | |
| 198 | cols = COLUMNS(container); |
| 199 | |
| 200 | /* |
| 201 | * Default is to add a new widget spanning all columns. |
| 202 | */ |
| 203 | columns_add(cols, widget, 0, 0); /* 0 means ncols */ |
| 204 | } |
| 205 | |
| 206 | static void columns_remove(GtkContainer *container, GtkWidget *widget) |
| 207 | { |
| 208 | Columns *cols; |
| 209 | ColumnsChild *child; |
| 210 | GtkWidget *childw; |
| 211 | GList *children; |
| 212 | gboolean was_visible; |
| 213 | |
| 214 | g_return_if_fail(container != NULL); |
| 215 | g_return_if_fail(IS_COLUMNS(container)); |
| 216 | g_return_if_fail(widget != NULL); |
| 217 | |
| 218 | cols = COLUMNS(container); |
| 219 | |
| 220 | for (children = cols->children; |
| 221 | children && (child = children->data); |
| 222 | children = children->next) { |
| 223 | if (child->widget != widget) |
| 224 | continue; |
| 225 | |
| 226 | was_visible = GTK_WIDGET_VISIBLE(widget); |
| 227 | gtk_widget_unparent(widget); |
| 228 | cols->children = g_list_remove_link(cols->children, children); |
| 229 | g_list_free(children); |
| 230 | g_free(child); |
| 231 | if (was_visible) |
| 232 | gtk_widget_queue_resize(GTK_WIDGET(container)); |
| 233 | break; |
| 234 | } |
| 235 | |
| 236 | for (children = cols->taborder; |
| 237 | children && (childw = children->data); |
| 238 | children = children->next) { |
| 239 | if (childw != widget) |
| 240 | continue; |
| 241 | |
| 242 | cols->taborder = g_list_remove_link(cols->taborder, children); |
| 243 | g_list_free(children); |
| 244 | break; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static void columns_forall(GtkContainer *container, gboolean include_internals, |
| 249 | GtkCallback callback, gpointer callback_data) |
| 250 | { |
| 251 | Columns *cols; |
| 252 | ColumnsChild *child; |
| 253 | GList *children, *next; |
| 254 | |
| 255 | g_return_if_fail(container != NULL); |
| 256 | g_return_if_fail(IS_COLUMNS(container)); |
| 257 | g_return_if_fail(callback != NULL); |
| 258 | |
| 259 | cols = COLUMNS(container); |
| 260 | |
| 261 | for (children = cols->children; |
| 262 | children && (child = children->data); |
| 263 | children = next) { |
| 264 | /* |
| 265 | * We can't wait until after the callback to assign |
| 266 | * `children = children->next', because the callback might |
| 267 | * be gtk_widget_destroy, which would remove the link |
| 268 | * `children' from the list! So instead we must get our |
| 269 | * hands on the value of the `next' pointer _before_ the |
| 270 | * callback. |
| 271 | */ |
| 272 | next = children->next; |
| 273 | if (child->widget) |
| 274 | callback(child->widget, callback_data); |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | static GtkType columns_child_type(GtkContainer *container) |
| 279 | { |
| 280 | return GTK_TYPE_WIDGET; |
| 281 | } |
| 282 | |
| 283 | GtkWidget *columns_new(gint spacing) |
| 284 | { |
| 285 | Columns *cols; |
| 286 | |
| 287 | cols = gtk_type_new(columns_get_type()); |
| 288 | cols->spacing = spacing; |
| 289 | |
| 290 | return GTK_WIDGET(cols); |
| 291 | } |
| 292 | |
| 293 | void columns_set_cols(Columns *cols, gint ncols, const gint *percentages) |
| 294 | { |
| 295 | ColumnsChild *childdata; |
| 296 | gint i; |
| 297 | |
| 298 | g_return_if_fail(cols != NULL); |
| 299 | g_return_if_fail(IS_COLUMNS(cols)); |
| 300 | g_return_if_fail(ncols > 0); |
| 301 | g_return_if_fail(percentages != NULL); |
| 302 | |
| 303 | childdata = g_new(ColumnsChild, 1); |
| 304 | childdata->widget = NULL; |
| 305 | childdata->ncols = ncols; |
| 306 | childdata->percentages = g_new(gint, ncols); |
| 307 | childdata->force_left = FALSE; |
| 308 | for (i = 0; i < ncols; i++) |
| 309 | childdata->percentages[i] = percentages[i]; |
| 310 | |
| 311 | cols->children = g_list_append(cols->children, childdata); |
| 312 | } |
| 313 | |
| 314 | void columns_add(Columns *cols, GtkWidget *child, |
| 315 | gint colstart, gint colspan) |
| 316 | { |
| 317 | ColumnsChild *childdata; |
| 318 | |
| 319 | g_return_if_fail(cols != NULL); |
| 320 | g_return_if_fail(IS_COLUMNS(cols)); |
| 321 | g_return_if_fail(child != NULL); |
| 322 | g_return_if_fail(child->parent == NULL); |
| 323 | |
| 324 | childdata = g_new(ColumnsChild, 1); |
| 325 | childdata->widget = child; |
| 326 | childdata->colstart = colstart; |
| 327 | childdata->colspan = colspan; |
| 328 | childdata->force_left = FALSE; |
| 329 | |
| 330 | cols->children = g_list_append(cols->children, childdata); |
| 331 | cols->taborder = g_list_append(cols->taborder, child); |
| 332 | |
| 333 | gtk_widget_set_parent(child, GTK_WIDGET(cols)); |
| 334 | |
| 335 | if (GTK_WIDGET_REALIZED(cols)) |
| 336 | gtk_widget_realize(child); |
| 337 | |
| 338 | if (GTK_WIDGET_VISIBLE(cols) && GTK_WIDGET_VISIBLE(child)) { |
| 339 | if (GTK_WIDGET_MAPPED(cols)) |
| 340 | gtk_widget_map(child); |
| 341 | gtk_widget_queue_resize(child); |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | void columns_force_left_align(Columns *cols, GtkWidget *widget) |
| 346 | { |
| 347 | ColumnsChild *child; |
| 348 | GList *children; |
| 349 | |
| 350 | g_return_if_fail(cols != NULL); |
| 351 | g_return_if_fail(IS_COLUMNS(cols)); |
| 352 | g_return_if_fail(widget != NULL); |
| 353 | |
| 354 | for (children = cols->children; |
| 355 | children && (child = children->data); |
| 356 | children = children->next) { |
| 357 | if (child->widget != widget) |
| 358 | continue; |
| 359 | |
| 360 | child->force_left = TRUE; |
| 361 | if (GTK_WIDGET_VISIBLE(widget)) |
| 362 | gtk_widget_queue_resize(GTK_WIDGET(cols)); |
| 363 | break; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | void columns_taborder_last(Columns *cols, GtkWidget *widget) |
| 368 | { |
| 369 | GtkWidget *childw; |
| 370 | GList *children; |
| 371 | |
| 372 | g_return_if_fail(cols != NULL); |
| 373 | g_return_if_fail(IS_COLUMNS(cols)); |
| 374 | g_return_if_fail(widget != NULL); |
| 375 | |
| 376 | for (children = cols->taborder; |
| 377 | children && (childw = children->data); |
| 378 | children = children->next) { |
| 379 | if (childw != widget) |
| 380 | continue; |
| 381 | |
| 382 | cols->taborder = g_list_remove_link(cols->taborder, children); |
| 383 | g_list_free(children); |
| 384 | cols->taborder = g_list_append(cols->taborder, widget); |
| 385 | break; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Override GtkContainer's focus movement so the user can |
| 391 | * explicitly specify the tab order. |
| 392 | */ |
| 393 | static gint columns_focus(GtkContainer *container, GtkDirectionType dir) |
| 394 | { |
| 395 | Columns *cols; |
| 396 | GList *pos; |
| 397 | GtkWidget *focuschild; |
| 398 | |
| 399 | g_return_val_if_fail(container != NULL, FALSE); |
| 400 | g_return_val_if_fail(IS_COLUMNS(container), FALSE); |
| 401 | |
| 402 | cols = COLUMNS(container); |
| 403 | |
| 404 | if (!GTK_WIDGET_DRAWABLE(cols) || |
| 405 | !GTK_WIDGET_IS_SENSITIVE(cols)) |
| 406 | return FALSE; |
| 407 | |
| 408 | if (!GTK_WIDGET_CAN_FOCUS(container) && |
| 409 | (dir == GTK_DIR_TAB_FORWARD || dir == GTK_DIR_TAB_BACKWARD)) { |
| 410 | |
| 411 | focuschild = container->focus_child; |
| 412 | gtk_container_set_focus_child(container, NULL); |
| 413 | |
| 414 | if (dir == GTK_DIR_TAB_FORWARD) |
| 415 | pos = cols->taborder; |
| 416 | else |
| 417 | pos = g_list_last(cols->taborder); |
| 418 | |
| 419 | while (pos) { |
| 420 | GtkWidget *child = pos->data; |
| 421 | |
| 422 | if (focuschild) { |
| 423 | if (focuschild == child) { |
| 424 | focuschild = NULL; /* now we can start looking in here */ |
| 425 | if (GTK_WIDGET_DRAWABLE(child) && |
| 426 | GTK_IS_CONTAINER(child) && |
| 427 | !GTK_WIDGET_HAS_FOCUS(child)) { |
| 428 | if (gtk_container_focus(GTK_CONTAINER(child), dir)) |
| 429 | return TRUE; |
| 430 | } |
| 431 | } |
| 432 | } else if (GTK_WIDGET_DRAWABLE(child)) { |
| 433 | if (GTK_IS_CONTAINER(child)) { |
| 434 | if (gtk_container_focus(GTK_CONTAINER(child), dir)) |
| 435 | return TRUE; |
| 436 | } else if (GTK_WIDGET_CAN_FOCUS(child)) { |
| 437 | gtk_widget_grab_focus(child); |
| 438 | return TRUE; |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | if (dir == GTK_DIR_TAB_FORWARD) |
| 443 | pos = pos->next; |
| 444 | else |
| 445 | pos = pos->prev; |
| 446 | } |
| 447 | |
| 448 | return FALSE; |
| 449 | } else |
| 450 | return columns_inherited_focus(container, dir); |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Now here comes the interesting bit. The actual layout part is |
| 455 | * done in the following two functions: |
| 456 | * |
| 457 | * columns_size_request() examines the list of widgets held in the |
| 458 | * Columns, and returns a requisition stating the absolute minimum |
| 459 | * size it can bear to be. |
| 460 | * |
| 461 | * columns_size_allocate() is given an allocation telling it what |
| 462 | * size the whole container is going to be, and it calls |
| 463 | * gtk_widget_size_allocate() on all of its (visible) children to |
| 464 | * set their size and position relative to the top left of the |
| 465 | * container. |
| 466 | */ |
| 467 | |
| 468 | static void columns_size_request(GtkWidget *widget, GtkRequisition *req) |
| 469 | { |
| 470 | Columns *cols; |
| 471 | ColumnsChild *child; |
| 472 | GList *children; |
| 473 | gint i, ncols, colspan, *colypos; |
| 474 | const gint *percentages; |
| 475 | static const gint onecol[] = { 100 }; |
| 476 | |
| 477 | g_return_if_fail(widget != NULL); |
| 478 | g_return_if_fail(IS_COLUMNS(widget)); |
| 479 | g_return_if_fail(req != NULL); |
| 480 | |
| 481 | cols = COLUMNS(widget); |
| 482 | |
| 483 | req->width = 0; |
| 484 | req->height = cols->spacing; |
| 485 | |
| 486 | ncols = 1; |
| 487 | colypos = g_new(gint, 1); |
| 488 | colypos[0] = 0; |
| 489 | percentages = onecol; |
| 490 | |
| 491 | for (children = cols->children; |
| 492 | children && (child = children->data); |
| 493 | children = children->next) { |
| 494 | GtkRequisition creq; |
| 495 | |
| 496 | if (!child->widget) { |
| 497 | /* Column reconfiguration. */ |
| 498 | for (i = 1; i < ncols; i++) { |
| 499 | if (colypos[0] < colypos[i]) |
| 500 | colypos[0] = colypos[i]; |
| 501 | } |
| 502 | ncols = child->ncols; |
| 503 | percentages = child->percentages; |
| 504 | colypos = g_renew(gint, colypos, ncols); |
| 505 | for (i = 1; i < ncols; i++) |
| 506 | colypos[i] = colypos[0]; |
| 507 | continue; |
| 508 | } |
| 509 | |
| 510 | /* Only take visible widgets into account. */ |
| 511 | if (!GTK_WIDGET_VISIBLE(child->widget)) |
| 512 | continue; |
| 513 | |
| 514 | gtk_widget_size_request(child->widget, &creq); |
| 515 | colspan = child->colspan ? child->colspan : ncols-child->colstart; |
| 516 | |
| 517 | /* |
| 518 | * To compute width: we know that creq.width plus |
| 519 | * cols->spacing needs to equal a certain percentage of the |
| 520 | * full width of the container. So we work this value out, |
| 521 | * figure out how wide the container will need to be to |
| 522 | * make that percentage of it equal to that width, and |
| 523 | * ensure our returned width is at least that much. Very |
| 524 | * simple really. |
| 525 | */ |
| 526 | { |
| 527 | int percent, thiswid, fullwid; |
| 528 | |
| 529 | percent = 0; |
| 530 | for (i = 0; i < colspan; i++) |
| 531 | percent += percentages[child->colstart+i]; |
| 532 | |
| 533 | thiswid = creq.width + cols->spacing; |
| 534 | /* |
| 535 | * Since creq is the _minimum_ size the child needs, we |
| 536 | * must ensure that it gets _at least_ that size. |
| 537 | * Hence, when scaling thiswid up to fullwid, we must |
| 538 | * round up, which means adding percent-1 before |
| 539 | * dividing by percent. |
| 540 | */ |
| 541 | fullwid = (thiswid * 100 + percent - 1) / percent; |
| 542 | |
| 543 | /* |
| 544 | * The above calculation assumes every widget gets |
| 545 | * cols->spacing on the right. So we subtract |
| 546 | * cols->spacing here to account for the extra load of |
| 547 | * spacing on the right. |
| 548 | */ |
| 549 | if (req->width < fullwid - cols->spacing) |
| 550 | req->width = fullwid - cols->spacing; |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * To compute height: the widget's top will be positioned |
| 555 | * at the largest y value so far reached in any of the |
| 556 | * columns it crosses. Then it will go down by creq.height |
| 557 | * plus padding; and the point it reaches at the bottom is |
| 558 | * the new y value in all those columns, and minus the |
| 559 | * padding it is also a lower bound on our own size |
| 560 | * request. |
| 561 | */ |
| 562 | { |
| 563 | int topy, boty; |
| 564 | |
| 565 | topy = 0; |
| 566 | for (i = 0; i < colspan; i++) { |
| 567 | if (topy < colypos[child->colstart+i]) |
| 568 | topy = colypos[child->colstart+i]; |
| 569 | } |
| 570 | boty = topy + creq.height + cols->spacing; |
| 571 | for (i = 0; i < colspan; i++) { |
| 572 | colypos[child->colstart+i] = boty; |
| 573 | } |
| 574 | |
| 575 | if (req->height < boty - cols->spacing) |
| 576 | req->height = boty - cols->spacing; |
| 577 | } |
| 578 | } |
| 579 | |
| 580 | req->width += 2*GTK_CONTAINER(cols)->border_width; |
| 581 | req->height += 2*GTK_CONTAINER(cols)->border_width; |
| 582 | |
| 583 | g_free(colypos); |
| 584 | } |
| 585 | |
| 586 | static void columns_size_allocate(GtkWidget *widget, GtkAllocation *alloc) |
| 587 | { |
| 588 | Columns *cols; |
| 589 | ColumnsChild *child; |
| 590 | GList *children; |
| 591 | gint i, ncols, colspan, border, *colxpos, *colypos; |
| 592 | const gint *percentages; |
| 593 | static const gint onecol[] = { 100 }; |
| 594 | |
| 595 | g_return_if_fail(widget != NULL); |
| 596 | g_return_if_fail(IS_COLUMNS(widget)); |
| 597 | g_return_if_fail(alloc != NULL); |
| 598 | |
| 599 | cols = COLUMNS(widget); |
| 600 | widget->allocation = *alloc; |
| 601 | border = GTK_CONTAINER(cols)->border_width; |
| 602 | |
| 603 | ncols = 1; |
| 604 | percentages = onecol; |
| 605 | /* colxpos gives the starting x position of each column. |
| 606 | * We supply n+1 of them, so that we can find the RH edge easily. |
| 607 | * All ending x positions are expected to be adjusted afterwards by |
| 608 | * subtracting the spacing. */ |
| 609 | colxpos = g_new(gint, 2); |
| 610 | colxpos[0] = 0; |
| 611 | colxpos[1] = alloc->width - 2*border + cols->spacing; |
| 612 | /* As in size_request, colypos is the lowest y reached in each column. */ |
| 613 | colypos = g_new(gint, 1); |
| 614 | colypos[0] = 0; |
| 615 | |
| 616 | for (children = cols->children; |
| 617 | children && (child = children->data); |
| 618 | children = children->next) { |
| 619 | GtkRequisition creq; |
| 620 | GtkAllocation call; |
| 621 | |
| 622 | if (!child->widget) { |
| 623 | gint percent; |
| 624 | |
| 625 | /* Column reconfiguration. */ |
| 626 | for (i = 1; i < ncols; i++) { |
| 627 | if (colypos[0] < colypos[i]) |
| 628 | colypos[0] = colypos[i]; |
| 629 | } |
| 630 | ncols = child->ncols; |
| 631 | percentages = child->percentages; |
| 632 | colypos = g_renew(gint, colypos, ncols); |
| 633 | for (i = 1; i < ncols; i++) |
| 634 | colypos[i] = colypos[0]; |
| 635 | colxpos = g_renew(gint, colxpos, ncols + 1); |
| 636 | colxpos[0] = 0; |
| 637 | percent = 0; |
| 638 | for (i = 0; i < ncols; i++) { |
| 639 | percent += percentages[i]; |
| 640 | colxpos[i+1] = (((alloc->width - 2*border) + cols->spacing) |
| 641 | * percent / 100); |
| 642 | } |
| 643 | continue; |
| 644 | } |
| 645 | |
| 646 | /* Only take visible widgets into account. */ |
| 647 | if (!GTK_WIDGET_VISIBLE(child->widget)) |
| 648 | continue; |
| 649 | |
| 650 | gtk_widget_get_child_requisition(child->widget, &creq); |
| 651 | colspan = child->colspan ? child->colspan : ncols-child->colstart; |
| 652 | |
| 653 | /* |
| 654 | * Starting x position is cols[colstart]. |
| 655 | * Ending x position is cols[colstart+colspan] - spacing. |
| 656 | * |
| 657 | * Unless we're forcing left, in which case the width is |
| 658 | * exactly the requisition width. |
| 659 | */ |
| 660 | call.x = alloc->x + border + colxpos[child->colstart]; |
| 661 | if (child->force_left) |
| 662 | call.width = creq.width; |
| 663 | else |
| 664 | call.width = (colxpos[child->colstart+colspan] - |
| 665 | colxpos[child->colstart] - cols->spacing); |
| 666 | |
| 667 | /* |
| 668 | * To compute height: the widget's top will be positioned |
| 669 | * at the largest y value so far reached in any of the |
| 670 | * columns it crosses. Then it will go down by creq.height |
| 671 | * plus padding; and the point it reaches at the bottom is |
| 672 | * the new y value in all those columns. |
| 673 | */ |
| 674 | { |
| 675 | int topy, boty; |
| 676 | |
| 677 | topy = 0; |
| 678 | for (i = 0; i < colspan; i++) { |
| 679 | if (topy < colypos[child->colstart+i]) |
| 680 | topy = colypos[child->colstart+i]; |
| 681 | } |
| 682 | call.y = alloc->y + border + topy; |
| 683 | call.height = creq.height; |
| 684 | boty = topy + creq.height + cols->spacing; |
| 685 | for (i = 0; i < colspan; i++) { |
| 686 | colypos[child->colstart+i] = boty; |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | gtk_widget_size_allocate(child->widget, &call); |
| 691 | } |
| 692 | |
| 693 | g_free(colxpos); |
| 694 | g_free(colypos); |
| 695 | } |