| 1 | /* |
| 2 | * gtkcols.c - implementation of the `Columns' GTK layout container. |
| 3 | */ |
| 4 | |
| 5 | #include "gtkcols.h" |
| 6 | #include <gtk/gtk.h> |
| 7 | |
| 8 | static void columns_init(Columns *cols); |
| 9 | static void columns_class_init(ColumnsClass *klass); |
| 10 | static void columns_map(GtkWidget *widget); |
| 11 | static void columns_unmap(GtkWidget *widget); |
| 12 | #if !GTK_CHECK_VERSION(2,0,0) |
| 13 | static void columns_draw(GtkWidget *widget, GdkRectangle *area); |
| 14 | static gint columns_expose(GtkWidget *widget, GdkEventExpose *event); |
| 15 | #endif |
| 16 | static void columns_base_add(GtkContainer *container, GtkWidget *widget); |
| 17 | static void columns_remove(GtkContainer *container, GtkWidget *widget); |
| 18 | static void columns_forall(GtkContainer *container, gboolean include_internals, |
| 19 | GtkCallback callback, gpointer callback_data); |
| 20 | #if !GTK_CHECK_VERSION(2,0,0) |
| 21 | static gint columns_focus(GtkContainer *container, GtkDirectionType dir); |
| 22 | #endif |
| 23 | static GtkType columns_child_type(GtkContainer *container); |
| 24 | static void columns_size_request(GtkWidget *widget, GtkRequisition *req); |
| 25 | static void columns_size_allocate(GtkWidget *widget, GtkAllocation *alloc); |
| 26 | |
| 27 | static GtkContainerClass *parent_class = NULL; |
| 28 | |
| 29 | #if !GTK_CHECK_VERSION(2,0,0) |
| 30 | GtkType columns_get_type(void) |
| 31 | { |
| 32 | static GtkType columns_type = 0; |
| 33 | |
| 34 | if (!columns_type) { |
| 35 | static const GtkTypeInfo columns_info = { |
| 36 | "Columns", |
| 37 | sizeof(Columns), |
| 38 | sizeof(ColumnsClass), |
| 39 | (GtkClassInitFunc) columns_class_init, |
| 40 | (GtkObjectInitFunc) columns_init, |
| 41 | /* reserved_1 */ NULL, |
| 42 | /* reserved_2 */ NULL, |
| 43 | (GtkClassInitFunc) NULL, |
| 44 | }; |
| 45 | |
| 46 | columns_type = gtk_type_unique(GTK_TYPE_CONTAINER, &columns_info); |
| 47 | } |
| 48 | |
| 49 | return columns_type; |
| 50 | } |
| 51 | #else |
| 52 | GType columns_get_type(void) |
| 53 | { |
| 54 | static GType columns_type = 0; |
| 55 | |
| 56 | if (!columns_type) { |
| 57 | static const GTypeInfo columns_info = { |
| 58 | sizeof(ColumnsClass), |
| 59 | NULL, |
| 60 | NULL, |
| 61 | (GClassInitFunc) columns_class_init, |
| 62 | NULL, |
| 63 | NULL, |
| 64 | sizeof(Columns), |
| 65 | 0, |
| 66 | (GInstanceInitFunc)columns_init, |
| 67 | }; |
| 68 | |
| 69 | columns_type = g_type_register_static(GTK_TYPE_CONTAINER, "Columns", |
| 70 | &columns_info, 0); |
| 71 | } |
| 72 | |
| 73 | return columns_type; |
| 74 | } |
| 75 | #endif |
| 76 | |
| 77 | #if !GTK_CHECK_VERSION(2,0,0) |
| 78 | static gint (*columns_inherited_focus)(GtkContainer *container, |
| 79 | GtkDirectionType direction); |
| 80 | #endif |
| 81 | |
| 82 | static void columns_class_init(ColumnsClass *klass) |
| 83 | { |
| 84 | #if !GTK_CHECK_VERSION(2,0,0) |
| 85 | /* GtkObjectClass *object_class = (GtkObjectClass *)klass; */ |
| 86 | GtkWidgetClass *widget_class = (GtkWidgetClass *)klass; |
| 87 | GtkContainerClass *container_class = (GtkContainerClass *)klass; |
| 88 | #else |
| 89 | /* GObjectClass *object_class = G_OBJECT_CLASS(klass); */ |
| 90 | GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass); |
| 91 | GtkContainerClass *container_class = GTK_CONTAINER_CLASS(klass); |
| 92 | #endif |
| 93 | |
| 94 | #if !GTK_CHECK_VERSION(2,0,0) |
| 95 | parent_class = gtk_type_class(GTK_TYPE_CONTAINER); |
| 96 | #else |
| 97 | parent_class = g_type_class_peek_parent(klass); |
| 98 | #endif |
| 99 | |
| 100 | widget_class->map = columns_map; |
| 101 | widget_class->unmap = columns_unmap; |
| 102 | #if !GTK_CHECK_VERSION(2,0,0) |
| 103 | widget_class->draw = columns_draw; |
| 104 | widget_class->expose_event = columns_expose; |
| 105 | #endif |
| 106 | widget_class->size_request = columns_size_request; |
| 107 | widget_class->size_allocate = columns_size_allocate; |
| 108 | |
| 109 | container_class->add = columns_base_add; |
| 110 | container_class->remove = columns_remove; |
| 111 | container_class->forall = columns_forall; |
| 112 | container_class->child_type = columns_child_type; |
| 113 | #if !GTK_CHECK_VERSION(2,0,0) |
| 114 | /* Save the previous value of this method. */ |
| 115 | if (!columns_inherited_focus) |
| 116 | columns_inherited_focus = container_class->focus; |
| 117 | container_class->focus = columns_focus; |
| 118 | #endif |
| 119 | } |
| 120 | |
| 121 | static void columns_init(Columns *cols) |
| 122 | { |
| 123 | GTK_WIDGET_SET_FLAGS(cols, GTK_NO_WINDOW); |
| 124 | |
| 125 | cols->children = NULL; |
| 126 | cols->spacing = 0; |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * These appear to be thoroughly tedious functions; the only reason |
| 131 | * we have to reimplement them at all is because we defined our own |
| 132 | * format for our GList of children... |
| 133 | */ |
| 134 | static void columns_map(GtkWidget *widget) |
| 135 | { |
| 136 | Columns *cols; |
| 137 | ColumnsChild *child; |
| 138 | GList *children; |
| 139 | |
| 140 | g_return_if_fail(widget != NULL); |
| 141 | g_return_if_fail(IS_COLUMNS(widget)); |
| 142 | |
| 143 | cols = COLUMNS(widget); |
| 144 | GTK_WIDGET_SET_FLAGS(cols, GTK_MAPPED); |
| 145 | |
| 146 | for (children = cols->children; |
| 147 | children && (child = children->data); |
| 148 | children = children->next) { |
| 149 | if (child->widget && |
| 150 | GTK_WIDGET_VISIBLE(child->widget) && |
| 151 | !GTK_WIDGET_MAPPED(child->widget)) |
| 152 | gtk_widget_map(child->widget); |
| 153 | } |
| 154 | } |
| 155 | static void columns_unmap(GtkWidget *widget) |
| 156 | { |
| 157 | Columns *cols; |
| 158 | ColumnsChild *child; |
| 159 | GList *children; |
| 160 | |
| 161 | g_return_if_fail(widget != NULL); |
| 162 | g_return_if_fail(IS_COLUMNS(widget)); |
| 163 | |
| 164 | cols = COLUMNS(widget); |
| 165 | GTK_WIDGET_UNSET_FLAGS(cols, GTK_MAPPED); |
| 166 | |
| 167 | for (children = cols->children; |
| 168 | children && (child = children->data); |
| 169 | children = children->next) { |
| 170 | if (child->widget && |
| 171 | GTK_WIDGET_VISIBLE(child->widget) && |
| 172 | GTK_WIDGET_MAPPED(child->widget)) |
| 173 | gtk_widget_unmap(child->widget); |
| 174 | } |
| 175 | } |
| 176 | #if !GTK_CHECK_VERSION(2,0,0) |
| 177 | static void columns_draw(GtkWidget *widget, GdkRectangle *area) |
| 178 | { |
| 179 | Columns *cols; |
| 180 | ColumnsChild *child; |
| 181 | GList *children; |
| 182 | GdkRectangle child_area; |
| 183 | |
| 184 | g_return_if_fail(widget != NULL); |
| 185 | g_return_if_fail(IS_COLUMNS(widget)); |
| 186 | |
| 187 | if (GTK_WIDGET_DRAWABLE(widget)) { |
| 188 | cols = COLUMNS(widget); |
| 189 | |
| 190 | for (children = cols->children; |
| 191 | children && (child = children->data); |
| 192 | children = children->next) { |
| 193 | if (child->widget && |
| 194 | GTK_WIDGET_DRAWABLE(child->widget) && |
| 195 | gtk_widget_intersect(child->widget, area, &child_area)) |
| 196 | gtk_widget_draw(child->widget, &child_area); |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | static gint columns_expose(GtkWidget *widget, GdkEventExpose *event) |
| 201 | { |
| 202 | Columns *cols; |
| 203 | ColumnsChild *child; |
| 204 | GList *children; |
| 205 | GdkEventExpose child_event; |
| 206 | |
| 207 | g_return_val_if_fail(widget != NULL, FALSE); |
| 208 | g_return_val_if_fail(IS_COLUMNS(widget), FALSE); |
| 209 | g_return_val_if_fail(event != NULL, FALSE); |
| 210 | |
| 211 | if (GTK_WIDGET_DRAWABLE(widget)) { |
| 212 | cols = COLUMNS(widget); |
| 213 | child_event = *event; |
| 214 | |
| 215 | for (children = cols->children; |
| 216 | children && (child = children->data); |
| 217 | children = children->next) { |
| 218 | if (child->widget && |
| 219 | GTK_WIDGET_DRAWABLE(child->widget) && |
| 220 | GTK_WIDGET_NO_WINDOW(child->widget) && |
| 221 | gtk_widget_intersect(child->widget, &event->area, |
| 222 | &child_event.area)) |
| 223 | gtk_widget_event(child->widget, (GdkEvent *)&child_event); |
| 224 | } |
| 225 | } |
| 226 | return FALSE; |
| 227 | } |
| 228 | #endif |
| 229 | |
| 230 | static void columns_base_add(GtkContainer *container, GtkWidget *widget) |
| 231 | { |
| 232 | Columns *cols; |
| 233 | |
| 234 | g_return_if_fail(container != NULL); |
| 235 | g_return_if_fail(IS_COLUMNS(container)); |
| 236 | g_return_if_fail(widget != NULL); |
| 237 | |
| 238 | cols = COLUMNS(container); |
| 239 | |
| 240 | /* |
| 241 | * Default is to add a new widget spanning all columns. |
| 242 | */ |
| 243 | columns_add(cols, widget, 0, 0); /* 0 means ncols */ |
| 244 | } |
| 245 | |
| 246 | static void columns_remove(GtkContainer *container, GtkWidget *widget) |
| 247 | { |
| 248 | Columns *cols; |
| 249 | ColumnsChild *child; |
| 250 | GtkWidget *childw; |
| 251 | GList *children; |
| 252 | gboolean was_visible; |
| 253 | |
| 254 | g_return_if_fail(container != NULL); |
| 255 | g_return_if_fail(IS_COLUMNS(container)); |
| 256 | g_return_if_fail(widget != NULL); |
| 257 | |
| 258 | cols = COLUMNS(container); |
| 259 | |
| 260 | for (children = cols->children; |
| 261 | children && (child = children->data); |
| 262 | children = children->next) { |
| 263 | if (child->widget != widget) |
| 264 | continue; |
| 265 | |
| 266 | was_visible = GTK_WIDGET_VISIBLE(widget); |
| 267 | gtk_widget_unparent(widget); |
| 268 | cols->children = g_list_remove_link(cols->children, children); |
| 269 | g_list_free(children); |
| 270 | g_free(child); |
| 271 | if (was_visible) |
| 272 | gtk_widget_queue_resize(GTK_WIDGET(container)); |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | for (children = cols->taborder; |
| 277 | children && (childw = children->data); |
| 278 | children = children->next) { |
| 279 | if (childw != widget) |
| 280 | continue; |
| 281 | |
| 282 | cols->taborder = g_list_remove_link(cols->taborder, children); |
| 283 | g_list_free(children); |
| 284 | #if GTK_CHECK_VERSION(2,0,0) |
| 285 | gtk_container_set_focus_chain(container, cols->taborder); |
| 286 | #endif |
| 287 | break; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | static void columns_forall(GtkContainer *container, gboolean include_internals, |
| 292 | GtkCallback callback, gpointer callback_data) |
| 293 | { |
| 294 | Columns *cols; |
| 295 | ColumnsChild *child; |
| 296 | GList *children, *next; |
| 297 | |
| 298 | g_return_if_fail(container != NULL); |
| 299 | g_return_if_fail(IS_COLUMNS(container)); |
| 300 | g_return_if_fail(callback != NULL); |
| 301 | |
| 302 | cols = COLUMNS(container); |
| 303 | |
| 304 | for (children = cols->children; |
| 305 | children && (child = children->data); |
| 306 | children = next) { |
| 307 | /* |
| 308 | * We can't wait until after the callback to assign |
| 309 | * `children = children->next', because the callback might |
| 310 | * be gtk_widget_destroy, which would remove the link |
| 311 | * `children' from the list! So instead we must get our |
| 312 | * hands on the value of the `next' pointer _before_ the |
| 313 | * callback. |
| 314 | */ |
| 315 | next = children->next; |
| 316 | if (child->widget) |
| 317 | callback(child->widget, callback_data); |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | static GtkType columns_child_type(GtkContainer *container) |
| 322 | { |
| 323 | return GTK_TYPE_WIDGET; |
| 324 | } |
| 325 | |
| 326 | GtkWidget *columns_new(gint spacing) |
| 327 | { |
| 328 | Columns *cols; |
| 329 | |
| 330 | #if !GTK_CHECK_VERSION(2,0,0) |
| 331 | cols = gtk_type_new(columns_get_type()); |
| 332 | #else |
| 333 | cols = g_object_new(TYPE_COLUMNS, NULL); |
| 334 | #endif |
| 335 | |
| 336 | cols->spacing = spacing; |
| 337 | |
| 338 | return GTK_WIDGET(cols); |
| 339 | } |
| 340 | |
| 341 | void columns_set_cols(Columns *cols, gint ncols, const gint *percentages) |
| 342 | { |
| 343 | ColumnsChild *childdata; |
| 344 | gint i; |
| 345 | |
| 346 | g_return_if_fail(cols != NULL); |
| 347 | g_return_if_fail(IS_COLUMNS(cols)); |
| 348 | g_return_if_fail(ncols > 0); |
| 349 | g_return_if_fail(percentages != NULL); |
| 350 | |
| 351 | childdata = g_new(ColumnsChild, 1); |
| 352 | childdata->widget = NULL; |
| 353 | childdata->ncols = ncols; |
| 354 | childdata->percentages = g_new(gint, ncols); |
| 355 | childdata->force_left = FALSE; |
| 356 | for (i = 0; i < ncols; i++) |
| 357 | childdata->percentages[i] = percentages[i]; |
| 358 | |
| 359 | cols->children = g_list_append(cols->children, childdata); |
| 360 | } |
| 361 | |
| 362 | void columns_add(Columns *cols, GtkWidget *child, |
| 363 | gint colstart, gint colspan) |
| 364 | { |
| 365 | ColumnsChild *childdata; |
| 366 | |
| 367 | g_return_if_fail(cols != NULL); |
| 368 | g_return_if_fail(IS_COLUMNS(cols)); |
| 369 | g_return_if_fail(child != NULL); |
| 370 | g_return_if_fail(child->parent == NULL); |
| 371 | |
| 372 | childdata = g_new(ColumnsChild, 1); |
| 373 | childdata->widget = child; |
| 374 | childdata->colstart = colstart; |
| 375 | childdata->colspan = colspan; |
| 376 | childdata->force_left = FALSE; |
| 377 | |
| 378 | cols->children = g_list_append(cols->children, childdata); |
| 379 | cols->taborder = g_list_append(cols->taborder, child); |
| 380 | |
| 381 | gtk_widget_set_parent(child, GTK_WIDGET(cols)); |
| 382 | |
| 383 | #if GTK_CHECK_VERSION(2,0,0) |
| 384 | gtk_container_set_focus_chain(GTK_CONTAINER(cols), cols->taborder); |
| 385 | #endif |
| 386 | |
| 387 | if (GTK_WIDGET_REALIZED(cols)) |
| 388 | gtk_widget_realize(child); |
| 389 | |
| 390 | if (GTK_WIDGET_VISIBLE(cols) && GTK_WIDGET_VISIBLE(child)) { |
| 391 | if (GTK_WIDGET_MAPPED(cols)) |
| 392 | gtk_widget_map(child); |
| 393 | gtk_widget_queue_resize(child); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | void columns_force_left_align(Columns *cols, GtkWidget *widget) |
| 398 | { |
| 399 | ColumnsChild *child; |
| 400 | GList *children; |
| 401 | |
| 402 | g_return_if_fail(cols != NULL); |
| 403 | g_return_if_fail(IS_COLUMNS(cols)); |
| 404 | g_return_if_fail(widget != NULL); |
| 405 | |
| 406 | for (children = cols->children; |
| 407 | children && (child = children->data); |
| 408 | children = children->next) { |
| 409 | if (child->widget != widget) |
| 410 | continue; |
| 411 | |
| 412 | child->force_left = TRUE; |
| 413 | if (GTK_WIDGET_VISIBLE(widget)) |
| 414 | gtk_widget_queue_resize(GTK_WIDGET(cols)); |
| 415 | break; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | void columns_taborder_last(Columns *cols, GtkWidget *widget) |
| 420 | { |
| 421 | GtkWidget *childw; |
| 422 | GList *children; |
| 423 | |
| 424 | g_return_if_fail(cols != NULL); |
| 425 | g_return_if_fail(IS_COLUMNS(cols)); |
| 426 | g_return_if_fail(widget != NULL); |
| 427 | |
| 428 | for (children = cols->taborder; |
| 429 | children && (childw = children->data); |
| 430 | children = children->next) { |
| 431 | if (childw != widget) |
| 432 | continue; |
| 433 | |
| 434 | cols->taborder = g_list_remove_link(cols->taborder, children); |
| 435 | g_list_free(children); |
| 436 | cols->taborder = g_list_append(cols->taborder, widget); |
| 437 | #if GTK_CHECK_VERSION(2,0,0) |
| 438 | gtk_container_set_focus_chain(GTK_CONTAINER(cols), cols->taborder); |
| 439 | #endif |
| 440 | break; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | #if !GTK_CHECK_VERSION(2,0,0) |
| 445 | /* |
| 446 | * Override GtkContainer's focus movement so the user can |
| 447 | * explicitly specify the tab order. |
| 448 | */ |
| 449 | static gint columns_focus(GtkContainer *container, GtkDirectionType dir) |
| 450 | { |
| 451 | Columns *cols; |
| 452 | GList *pos; |
| 453 | GtkWidget *focuschild; |
| 454 | |
| 455 | g_return_val_if_fail(container != NULL, FALSE); |
| 456 | g_return_val_if_fail(IS_COLUMNS(container), FALSE); |
| 457 | |
| 458 | cols = COLUMNS(container); |
| 459 | |
| 460 | if (!GTK_WIDGET_DRAWABLE(cols) || |
| 461 | !GTK_WIDGET_IS_SENSITIVE(cols)) |
| 462 | return FALSE; |
| 463 | |
| 464 | if (!GTK_WIDGET_CAN_FOCUS(container) && |
| 465 | (dir == GTK_DIR_TAB_FORWARD || dir == GTK_DIR_TAB_BACKWARD)) { |
| 466 | |
| 467 | focuschild = container->focus_child; |
| 468 | gtk_container_set_focus_child(container, NULL); |
| 469 | |
| 470 | if (dir == GTK_DIR_TAB_FORWARD) |
| 471 | pos = cols->taborder; |
| 472 | else |
| 473 | pos = g_list_last(cols->taborder); |
| 474 | |
| 475 | while (pos) { |
| 476 | GtkWidget *child = pos->data; |
| 477 | |
| 478 | if (focuschild) { |
| 479 | if (focuschild == child) { |
| 480 | focuschild = NULL; /* now we can start looking in here */ |
| 481 | if (GTK_WIDGET_DRAWABLE(child) && |
| 482 | GTK_IS_CONTAINER(child) && |
| 483 | !GTK_WIDGET_HAS_FOCUS(child)) { |
| 484 | if (gtk_container_focus(GTK_CONTAINER(child), dir)) |
| 485 | return TRUE; |
| 486 | } |
| 487 | } |
| 488 | } else if (GTK_WIDGET_DRAWABLE(child)) { |
| 489 | if (GTK_IS_CONTAINER(child)) { |
| 490 | if (gtk_container_focus(GTK_CONTAINER(child), dir)) |
| 491 | return TRUE; |
| 492 | } else if (GTK_WIDGET_CAN_FOCUS(child)) { |
| 493 | gtk_widget_grab_focus(child); |
| 494 | return TRUE; |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | if (dir == GTK_DIR_TAB_FORWARD) |
| 499 | pos = pos->next; |
| 500 | else |
| 501 | pos = pos->prev; |
| 502 | } |
| 503 | |
| 504 | return FALSE; |
| 505 | } else |
| 506 | return columns_inherited_focus(container, dir); |
| 507 | } |
| 508 | #endif |
| 509 | |
| 510 | /* |
| 511 | * Now here comes the interesting bit. The actual layout part is |
| 512 | * done in the following two functions: |
| 513 | * |
| 514 | * columns_size_request() examines the list of widgets held in the |
| 515 | * Columns, and returns a requisition stating the absolute minimum |
| 516 | * size it can bear to be. |
| 517 | * |
| 518 | * columns_size_allocate() is given an allocation telling it what |
| 519 | * size the whole container is going to be, and it calls |
| 520 | * gtk_widget_size_allocate() on all of its (visible) children to |
| 521 | * set their size and position relative to the top left of the |
| 522 | * container. |
| 523 | */ |
| 524 | |
| 525 | static void columns_size_request(GtkWidget *widget, GtkRequisition *req) |
| 526 | { |
| 527 | Columns *cols; |
| 528 | ColumnsChild *child; |
| 529 | GList *children; |
| 530 | gint i, ncols, colspan, *colypos; |
| 531 | const gint *percentages; |
| 532 | static const gint onecol[] = { 100 }; |
| 533 | |
| 534 | g_return_if_fail(widget != NULL); |
| 535 | g_return_if_fail(IS_COLUMNS(widget)); |
| 536 | g_return_if_fail(req != NULL); |
| 537 | |
| 538 | cols = COLUMNS(widget); |
| 539 | |
| 540 | req->width = 0; |
| 541 | req->height = cols->spacing; |
| 542 | |
| 543 | ncols = 1; |
| 544 | colypos = g_new(gint, 1); |
| 545 | colypos[0] = 0; |
| 546 | percentages = onecol; |
| 547 | |
| 548 | for (children = cols->children; |
| 549 | children && (child = children->data); |
| 550 | children = children->next) { |
| 551 | GtkRequisition creq; |
| 552 | |
| 553 | if (!child->widget) { |
| 554 | /* Column reconfiguration. */ |
| 555 | for (i = 1; i < ncols; i++) { |
| 556 | if (colypos[0] < colypos[i]) |
| 557 | colypos[0] = colypos[i]; |
| 558 | } |
| 559 | ncols = child->ncols; |
| 560 | percentages = child->percentages; |
| 561 | colypos = g_renew(gint, colypos, ncols); |
| 562 | for (i = 1; i < ncols; i++) |
| 563 | colypos[i] = colypos[0]; |
| 564 | continue; |
| 565 | } |
| 566 | |
| 567 | /* Only take visible widgets into account. */ |
| 568 | if (!GTK_WIDGET_VISIBLE(child->widget)) |
| 569 | continue; |
| 570 | |
| 571 | gtk_widget_size_request(child->widget, &creq); |
| 572 | colspan = child->colspan ? child->colspan : ncols-child->colstart; |
| 573 | |
| 574 | /* |
| 575 | * To compute width: we know that creq.width plus |
| 576 | * cols->spacing needs to equal a certain percentage of the |
| 577 | * full width of the container. So we work this value out, |
| 578 | * figure out how wide the container will need to be to |
| 579 | * make that percentage of it equal to that width, and |
| 580 | * ensure our returned width is at least that much. Very |
| 581 | * simple really. |
| 582 | */ |
| 583 | { |
| 584 | int percent, thiswid, fullwid; |
| 585 | |
| 586 | percent = 0; |
| 587 | for (i = 0; i < colspan; i++) |
| 588 | percent += percentages[child->colstart+i]; |
| 589 | |
| 590 | thiswid = creq.width + cols->spacing; |
| 591 | /* |
| 592 | * Since creq is the _minimum_ size the child needs, we |
| 593 | * must ensure that it gets _at least_ that size. |
| 594 | * Hence, when scaling thiswid up to fullwid, we must |
| 595 | * round up, which means adding percent-1 before |
| 596 | * dividing by percent. |
| 597 | */ |
| 598 | fullwid = (thiswid * 100 + percent - 1) / percent; |
| 599 | |
| 600 | /* |
| 601 | * The above calculation assumes every widget gets |
| 602 | * cols->spacing on the right. So we subtract |
| 603 | * cols->spacing here to account for the extra load of |
| 604 | * spacing on the right. |
| 605 | */ |
| 606 | if (req->width < fullwid - cols->spacing) |
| 607 | req->width = fullwid - cols->spacing; |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * To compute height: the widget's top will be positioned |
| 612 | * at the largest y value so far reached in any of the |
| 613 | * columns it crosses. Then it will go down by creq.height |
| 614 | * plus padding; and the point it reaches at the bottom is |
| 615 | * the new y value in all those columns, and minus the |
| 616 | * padding it is also a lower bound on our own size |
| 617 | * request. |
| 618 | */ |
| 619 | { |
| 620 | int topy, boty; |
| 621 | |
| 622 | topy = 0; |
| 623 | for (i = 0; i < colspan; i++) { |
| 624 | if (topy < colypos[child->colstart+i]) |
| 625 | topy = colypos[child->colstart+i]; |
| 626 | } |
| 627 | boty = topy + creq.height + cols->spacing; |
| 628 | for (i = 0; i < colspan; i++) { |
| 629 | colypos[child->colstart+i] = boty; |
| 630 | } |
| 631 | |
| 632 | if (req->height < boty - cols->spacing) |
| 633 | req->height = boty - cols->spacing; |
| 634 | } |
| 635 | } |
| 636 | |
| 637 | req->width += 2*GTK_CONTAINER(cols)->border_width; |
| 638 | req->height += 2*GTK_CONTAINER(cols)->border_width; |
| 639 | |
| 640 | g_free(colypos); |
| 641 | } |
| 642 | |
| 643 | static void columns_size_allocate(GtkWidget *widget, GtkAllocation *alloc) |
| 644 | { |
| 645 | Columns *cols; |
| 646 | ColumnsChild *child; |
| 647 | GList *children; |
| 648 | gint i, ncols, colspan, border, *colxpos, *colypos; |
| 649 | const gint *percentages; |
| 650 | static const gint onecol[] = { 100 }; |
| 651 | |
| 652 | g_return_if_fail(widget != NULL); |
| 653 | g_return_if_fail(IS_COLUMNS(widget)); |
| 654 | g_return_if_fail(alloc != NULL); |
| 655 | |
| 656 | cols = COLUMNS(widget); |
| 657 | widget->allocation = *alloc; |
| 658 | border = GTK_CONTAINER(cols)->border_width; |
| 659 | |
| 660 | ncols = 1; |
| 661 | percentages = onecol; |
| 662 | /* colxpos gives the starting x position of each column. |
| 663 | * We supply n+1 of them, so that we can find the RH edge easily. |
| 664 | * All ending x positions are expected to be adjusted afterwards by |
| 665 | * subtracting the spacing. */ |
| 666 | colxpos = g_new(gint, 2); |
| 667 | colxpos[0] = 0; |
| 668 | colxpos[1] = alloc->width - 2*border + cols->spacing; |
| 669 | /* As in size_request, colypos is the lowest y reached in each column. */ |
| 670 | colypos = g_new(gint, 1); |
| 671 | colypos[0] = 0; |
| 672 | |
| 673 | for (children = cols->children; |
| 674 | children && (child = children->data); |
| 675 | children = children->next) { |
| 676 | GtkRequisition creq; |
| 677 | GtkAllocation call; |
| 678 | |
| 679 | if (!child->widget) { |
| 680 | gint percent; |
| 681 | |
| 682 | /* Column reconfiguration. */ |
| 683 | for (i = 1; i < ncols; i++) { |
| 684 | if (colypos[0] < colypos[i]) |
| 685 | colypos[0] = colypos[i]; |
| 686 | } |
| 687 | ncols = child->ncols; |
| 688 | percentages = child->percentages; |
| 689 | colypos = g_renew(gint, colypos, ncols); |
| 690 | for (i = 1; i < ncols; i++) |
| 691 | colypos[i] = colypos[0]; |
| 692 | colxpos = g_renew(gint, colxpos, ncols + 1); |
| 693 | colxpos[0] = 0; |
| 694 | percent = 0; |
| 695 | for (i = 0; i < ncols; i++) { |
| 696 | percent += percentages[i]; |
| 697 | colxpos[i+1] = (((alloc->width - 2*border) + cols->spacing) |
| 698 | * percent / 100); |
| 699 | } |
| 700 | continue; |
| 701 | } |
| 702 | |
| 703 | /* Only take visible widgets into account. */ |
| 704 | if (!GTK_WIDGET_VISIBLE(child->widget)) |
| 705 | continue; |
| 706 | |
| 707 | gtk_widget_get_child_requisition(child->widget, &creq); |
| 708 | colspan = child->colspan ? child->colspan : ncols-child->colstart; |
| 709 | |
| 710 | /* |
| 711 | * Starting x position is cols[colstart]. |
| 712 | * Ending x position is cols[colstart+colspan] - spacing. |
| 713 | * |
| 714 | * Unless we're forcing left, in which case the width is |
| 715 | * exactly the requisition width. |
| 716 | */ |
| 717 | call.x = alloc->x + border + colxpos[child->colstart]; |
| 718 | if (child->force_left) |
| 719 | call.width = creq.width; |
| 720 | else |
| 721 | call.width = (colxpos[child->colstart+colspan] - |
| 722 | colxpos[child->colstart] - cols->spacing); |
| 723 | |
| 724 | /* |
| 725 | * To compute height: the widget's top will be positioned |
| 726 | * at the largest y value so far reached in any of the |
| 727 | * columns it crosses. Then it will go down by creq.height |
| 728 | * plus padding; and the point it reaches at the bottom is |
| 729 | * the new y value in all those columns. |
| 730 | */ |
| 731 | { |
| 732 | int topy, boty; |
| 733 | |
| 734 | topy = 0; |
| 735 | for (i = 0; i < colspan; i++) { |
| 736 | if (topy < colypos[child->colstart+i]) |
| 737 | topy = colypos[child->colstart+i]; |
| 738 | } |
| 739 | call.y = alloc->y + border + topy; |
| 740 | call.height = creq.height; |
| 741 | boty = topy + creq.height + cols->spacing; |
| 742 | for (i = 0; i < colspan; i++) { |
| 743 | colypos[child->colstart+i] = boty; |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | gtk_widget_size_allocate(child->widget, &call); |
| 748 | } |
| 749 | |
| 750 | g_free(colxpos); |
| 751 | g_free(colypos); |
| 752 | } |