2 * Copyright (C) 2007-2010 Openismus GmbH
5 * Mathias Hasselmann <mathias@openismus.com>
6 * Tristan Van Berkom <tristan.van.berkom@gmail.com>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
24 #include "gtksizerequest.h"
28 #include "gtkprivate.h"
29 #include "gtksizegroup-private.h"
30 #include "gtksizerequestcacheprivate.h"
31 #include "gtkwidgetprivate.h"
32 #include "deprecated/gtkstyle.h"
35 #ifndef G_DISABLE_CHECKS
36 static GQuark recursion_check_quark = 0;
37 #endif /* G_DISABLE_CHECKS */
40 push_recursion_check (GtkWidget *widget,
41 GtkSizeGroupMode orientation,
44 #ifndef G_DISABLE_CHECKS
45 const char *previous_method;
48 if (recursion_check_quark == 0)
49 recursion_check_quark = g_quark_from_static_string ("gtk-size-request-in-progress");
51 previous_method = g_object_get_qdata (G_OBJECT (widget), recursion_check_quark);
53 if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
55 method = for_size < 0 ? "get_width" : "get_width_for_height";
59 method = for_size < 0 ? "get_height" : "get_height_for_width";
62 if (previous_method != NULL)
64 g_warning ("%s %p: widget tried to gtk_widget_%s inside "
65 " GtkWidget ::%s implementation. "
66 "Should just invoke GTK_WIDGET_GET_CLASS(widget)->%s "
67 "directly rather than using gtk_widget_%s",
68 G_OBJECT_TYPE_NAME (widget), widget,
69 method, previous_method,
73 g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, (char*) method);
74 #endif /* G_DISABLE_CHECKS */
78 pop_recursion_check (GtkWidget *widget,
79 GtkSizeGroupMode orientation)
81 #ifndef G_DISABLE_CHECKS
82 g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, NULL);
87 /* looks for a cached size request for this for_size. If not
88 * found, returns the oldest entry so it can be overwritten
90 * Note that this caching code was originally derived from
91 * the Clutter toolkit but has evolved for other GTK+ requirements.
94 get_cached_size (GtkWidget *widget,
95 GtkSizeGroupMode orientation,
99 SizeRequestCache *cache;
100 SizeRequest **cached_sizes;
103 cache = _gtk_widget_peek_request_cache (widget);
107 if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
109 *result = &cache->cached_width;
110 return cache->cached_base_width;
114 *result = &cache->cached_height;
115 return cache->cached_base_height;
119 if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
121 cached_sizes = cache->widths;
122 n_sizes = cache->cached_widths;
126 cached_sizes = cache->heights;
127 n_sizes = cache->cached_heights;
130 /* Search for an already cached size */
131 for (i = 0; i < n_sizes; i++)
133 if (cached_sizes[i]->lower_for_size <= for_size &&
134 cached_sizes[i]->upper_for_size >= for_size)
136 *result = &cached_sizes[i]->cached_size;
145 get_vfunc_name (GtkSizeGroupMode orientation,
148 if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
149 return for_size < 0 ? "get_preferred_width" : "get_preferred_width_for_height";
151 return for_size < 0 ? "get_preferred_height" : "get_preferred_height_for_width";
155 gtk_widget_query_size_for_orientation (GtkWidget *widget,
156 GtkSizeGroupMode orientation,
161 CachedSize *cached_size;
162 gboolean found_in_cache = FALSE;
166 found_in_cache = get_cached_size (widget, orientation, for_size, &cached_size);
170 gint adjusted_min, adjusted_natural, adjusted_for_size = for_size;
172 gtk_widget_ensure_style (widget);
174 if (orientation == GTK_SIZE_GROUP_HORIZONTAL)
176 if (for_size < 0 || gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_CONSTANT_SIZE)
178 push_recursion_check (widget, orientation, for_size);
179 GTK_WIDGET_GET_CLASS (widget)->get_preferred_width (widget, &min_size, &nat_size);
180 pop_recursion_check (widget, orientation);
184 gint ignored_position = 0;
188 /* Pull the base natural height from the cache as it's needed to adjust
189 * the proposed 'for_size' */
190 gtk_widget_get_preferred_height (widget, &minimum_height, &natural_height);
192 /* convert for_size to unadjusted height (for_size is a proposed allocation) */
193 GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
194 GTK_ORIENTATION_VERTICAL,
200 push_recursion_check (widget, orientation, for_size);
201 GTK_WIDGET_GET_CLASS (widget)->get_preferred_width_for_height (widget,
202 MAX (adjusted_for_size, minimum_height),
203 &min_size, &nat_size);
204 pop_recursion_check (widget, orientation);
209 if (for_size < 0 || gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_CONSTANT_SIZE)
211 push_recursion_check (widget, orientation, for_size);
212 GTK_WIDGET_GET_CLASS (widget)->get_preferred_height (widget, &min_size, &nat_size);
213 pop_recursion_check (widget, orientation);
217 gint ignored_position = 0;
221 /* Pull the base natural width from the cache as it's needed to adjust
222 * the proposed 'for_size' */
223 gtk_widget_get_preferred_width (widget, &minimum_width, &natural_width);
225 /* convert for_size to unadjusted width (for_size is a proposed allocation) */
226 GTK_WIDGET_GET_CLASS (widget)->adjust_size_allocation (widget,
227 GTK_ORIENTATION_HORIZONTAL,
233 push_recursion_check (widget, orientation, for_size);
234 GTK_WIDGET_GET_CLASS (widget)->get_preferred_height_for_width (widget,
235 MAX (adjusted_for_size, minimum_width),
236 &min_size, &nat_size);
237 pop_recursion_check (widget, orientation);
241 if (min_size > nat_size)
243 g_warning ("%s %p reported min size %d and natural size %d in %s(); natural size must be >= min size",
244 G_OBJECT_TYPE_NAME (widget), widget, min_size, nat_size, get_vfunc_name (orientation, for_size));
247 adjusted_min = min_size;
248 adjusted_natural = nat_size;
249 GTK_WIDGET_GET_CLASS (widget)->adjust_size_request (widget,
250 orientation == GTK_SIZE_GROUP_HORIZONTAL ?
251 GTK_ORIENTATION_HORIZONTAL :
252 GTK_ORIENTATION_VERTICAL,
256 if (adjusted_min < min_size ||
257 adjusted_natural < nat_size)
259 g_warning ("%s %p adjusted size %s min %d natural %d must not decrease below min %d natural %d",
260 G_OBJECT_TYPE_NAME (widget), widget,
261 orientation == GTK_SIZE_GROUP_VERTICAL ? "vertical" : "horizontal",
262 adjusted_min, adjusted_natural,
264 /* don't use the adjustment */
266 else if (adjusted_min > adjusted_natural)
268 g_warning ("%s %p adjusted size %s min %d natural %d original min %d natural %d has min greater than natural",
269 G_OBJECT_TYPE_NAME (widget), widget,
270 orientation == GTK_SIZE_GROUP_VERTICAL ? "vertical" : "horizontal",
271 adjusted_min, adjusted_natural,
273 /* don't use the adjustment */
277 /* adjustment looks good */
278 min_size = adjusted_min;
279 nat_size = adjusted_natural;
282 _gtk_size_request_cache_commit (_gtk_widget_peek_request_cache (widget),
290 min_size = cached_size->minimum_size;
291 nat_size = cached_size->natural_size;
295 *minimum_size = min_size;
298 *natural_size = nat_size;
300 g_assert (min_size <= nat_size);
302 GTK_NOTE (SIZE_REQUEST,
303 g_print ("[%p] %s\t%s: %d is minimum %d and natural: %d (hit cache: %s)\n",
304 widget, G_OBJECT_TYPE_NAME (widget),
305 orientation == GTK_SIZE_GROUP_HORIZONTAL ?
306 "width for height" : "height for width" ,
307 for_size, min_size, nat_size,
308 found_in_cache ? "yes" : "no"));
312 /* This is the main function that checks for a cached size and
313 * possibly queries the widget class to compute the size if it's
314 * not cached. If the for_size here is -1, then get_preferred_width()
315 * or get_preferred_height() will be used.
318 _gtk_widget_compute_size_for_orientation (GtkWidget *widget,
319 GtkSizeGroupMode mode,
327 gint min_result = 0, nat_result = 0;
329 if (G_LIKELY (!_gtk_widget_get_sizegroups (widget)))
331 gtk_widget_query_size_for_orientation (widget, mode, for_size, minimum, natural);
335 widgets = _gtk_size_group_get_widget_peers (widget, mode);
337 g_hash_table_foreach (widgets, (GHFunc) g_object_ref, NULL);
339 g_hash_table_iter_init (&iter, widgets);
340 while (g_hash_table_iter_next (&iter, &key, NULL))
342 GtkWidget *tmp_widget = key;
343 gint min_dimension, nat_dimension;
345 gtk_widget_query_size_for_orientation (tmp_widget, mode, for_size, &min_dimension, &nat_dimension);
347 min_result = MAX (min_result, min_dimension);
348 nat_result = MAX (nat_result, nat_dimension);
351 g_hash_table_foreach (widgets, (GHFunc) g_object_unref, NULL);
353 g_hash_table_destroy (widgets);
356 *minimum = min_result;
359 *natural = nat_result;
363 * gtk_widget_get_request_mode:
364 * @widget: a #GtkWidget instance
366 * Gets whether the widget prefers a height-for-width layout
367 * or a width-for-height layout.
369 * <note><para>#GtkBin widgets generally propagate the preference of
370 * their child, container widgets need to request something either in
371 * context of their children or in context of their allocation
372 * capabilities.</para></note>
374 * Returns: The #GtkSizeRequestMode preferred by @widget.
379 gtk_widget_get_request_mode (GtkWidget *widget)
381 SizeRequestCache *cache;
383 g_return_val_if_fail (GTK_IS_WIDGET (widget), GTK_SIZE_REQUEST_CONSTANT_SIZE);
385 cache = _gtk_widget_peek_request_cache (widget);
387 if (!cache->request_mode_valid)
389 cache->request_mode = GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget);
390 cache->request_mode_valid = TRUE;
393 return cache->request_mode;
397 * gtk_widget_get_preferred_width:
398 * @widget: a #GtkWidget instance
399 * @minimum_width: (out) (allow-none): location to store the minimum width, or %NULL
400 * @natural_width: (out) (allow-none): location to store the natural width, or %NULL
402 * Retrieves a widget's initial minimum and natural width.
404 * <note><para>This call is specific to height-for-width
405 * requests.</para></note>
407 * The returned request will be modified by the
408 * GtkWidgetClass::adjust_size_request virtual method and by any
409 * #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
410 * is the one that should be used for layout, not necessarily the one
411 * returned by the widget itself.
416 gtk_widget_get_preferred_width (GtkWidget *widget,
420 g_return_if_fail (GTK_IS_WIDGET (widget));
421 g_return_if_fail (minimum_width != NULL || natural_width != NULL);
423 _gtk_widget_compute_size_for_orientation (widget,
424 GTK_SIZE_GROUP_HORIZONTAL,
432 * gtk_widget_get_preferred_height:
433 * @widget: a #GtkWidget instance
434 * @minimum_height: (out) (allow-none): location to store the minimum height, or %NULL
435 * @natural_height: (out) (allow-none): location to store the natural height, or %NULL
437 * Retrieves a widget's initial minimum and natural height.
439 * <note><para>This call is specific to width-for-height requests.</para></note>
441 * The returned request will be modified by the
442 * GtkWidgetClass::adjust_size_request virtual method and by any
443 * #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
444 * is the one that should be used for layout, not necessarily the one
445 * returned by the widget itself.
450 gtk_widget_get_preferred_height (GtkWidget *widget,
451 gint *minimum_height,
452 gint *natural_height)
454 g_return_if_fail (GTK_IS_WIDGET (widget));
455 g_return_if_fail (minimum_height != NULL || natural_height != NULL);
457 _gtk_widget_compute_size_for_orientation (widget,
458 GTK_SIZE_GROUP_VERTICAL,
467 * gtk_widget_get_preferred_width_for_height:
468 * @widget: a #GtkWidget instance
469 * @height: the height which is available for allocation
470 * @minimum_width: (out) (allow-none): location for storing the minimum width, or %NULL
471 * @natural_width: (out) (allow-none): location for storing the natural width, or %NULL
473 * Retrieves a widget's minimum and natural width if it would be given
474 * the specified @height.
476 * The returned request will be modified by the
477 * GtkWidgetClass::adjust_size_request virtual method and by any
478 * #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
479 * is the one that should be used for layout, not necessarily the one
480 * returned by the widget itself.
485 gtk_widget_get_preferred_width_for_height (GtkWidget *widget,
490 g_return_if_fail (GTK_IS_WIDGET (widget));
491 g_return_if_fail (minimum_width != NULL || natural_width != NULL);
492 g_return_if_fail (height >= 0);
494 _gtk_widget_compute_size_for_orientation (widget,
495 GTK_SIZE_GROUP_HORIZONTAL,
502 * gtk_widget_get_preferred_height_for_width:
503 * @widget: a #GtkWidget instance
504 * @width: the width which is available for allocation
505 * @minimum_height: (out) (allow-none): location for storing the minimum height, or %NULL
506 * @natural_height: (out) (allow-none): location for storing the natural height, or %NULL
508 * Retrieves a widget's minimum and natural height if it would be given
509 * the specified @width.
511 * The returned request will be modified by the
512 * GtkWidgetClass::adjust_size_request virtual method and by any
513 * #GtkSizeGroup<!-- -->s that have been applied. That is, the returned request
514 * is the one that should be used for layout, not necessarily the one
515 * returned by the widget itself.
520 gtk_widget_get_preferred_height_for_width (GtkWidget *widget,
522 gint *minimum_height,
523 gint *natural_height)
525 g_return_if_fail (GTK_IS_WIDGET (widget));
526 g_return_if_fail (minimum_height != NULL || natural_height != NULL);
527 g_return_if_fail (width >= 0);
529 _gtk_widget_compute_size_for_orientation (widget,
530 GTK_SIZE_GROUP_VERTICAL,
537 * gtk_widget_get_preferred_size:
538 * @widget: a #GtkWidget instance
539 * @minimum_size: (out) (allow-none): location for storing the minimum size, or %NULL
540 * @natural_size: (out) (allow-none): location for storing the natural size, or %NULL
542 * Retrieves the minimum and natural size of a widget, taking
543 * into account the widget's preference for height-for-width management.
545 * This is used to retrieve a suitable size by container widgets which do
546 * not impose any restrictions on the child placement. It can be used
547 * to deduce toplevel window and menu sizes as well as child widgets in
548 * free-form containers such as GtkLayout.
550 * <note><para>Handle with care. Note that the natural height of a height-for-width
551 * widget will generally be a smaller size than the minimum height, since the required
552 * height for the natural width is generally smaller than the required height for
553 * the minimum width.</para></note>
558 gtk_widget_get_preferred_size (GtkWidget *widget,
559 GtkRequisition *minimum_size,
560 GtkRequisition *natural_size)
562 gint min_width, nat_width;
563 gint min_height, nat_height;
565 g_return_if_fail (GTK_IS_WIDGET (widget));
567 if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
569 gtk_widget_get_preferred_width (widget, &min_width, &nat_width);
573 minimum_size->width = min_width;
574 gtk_widget_get_preferred_height_for_width (widget, min_width,
575 &minimum_size->height, NULL);
580 natural_size->width = nat_width;
581 gtk_widget_get_preferred_height_for_width (widget, nat_width,
582 NULL, &natural_size->height);
585 else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT or CONSTANT_SIZE */
587 gtk_widget_get_preferred_height (widget, &min_height, &nat_height);
591 minimum_size->height = min_height;
592 gtk_widget_get_preferred_width_for_height (widget, min_height,
593 &minimum_size->width, NULL);
598 natural_size->height = nat_height;
599 gtk_widget_get_preferred_width_for_height (widget, nat_height,
600 NULL, &natural_size->width);
607 compare_gap (gconstpointer p1,
611 GtkRequestedSize *sizes = data;
612 const guint *c1 = p1;
613 const guint *c2 = p2;
615 const gint d1 = MAX (sizes[*c1].natural_size -
616 sizes[*c1].minimum_size,
618 const gint d2 = MAX (sizes[*c2].natural_size -
619 sizes[*c2].minimum_size,
622 gint delta = (d2 - d1);
631 * gtk_distribute_natural_allocation:
632 * @extra_space: Extra space to redistribute among children after subtracting
633 * minimum sizes and any child padding from the overall allocation
634 * @n_requested_sizes: Number of requests to fit into the allocation
635 * @sizes: An array of structs with a client pointer and a minimum/natural size
636 * in the orientation of the allocation.
638 * Distributes @extra_space to child @sizes by bringing smaller
639 * children up to natural size first.
641 * The remaining space will be added to the @minimum_size member of the
642 * GtkRequestedSize struct. If all sizes reach their natural size then
643 * the remaining space is returned.
645 * Returns: The remainder of @extra_space after redistributing space
649 gtk_distribute_natural_allocation (gint extra_space,
650 guint n_requested_sizes,
651 GtkRequestedSize *sizes)
656 g_return_val_if_fail (extra_space >= 0, 0);
658 spreading = g_newa (guint, n_requested_sizes);
660 for (i = 0; i < n_requested_sizes; i++)
663 /* Distribute the container's extra space c_gap. We want to assign
664 * this space such that the sum of extra space assigned to children
665 * (c^i_gap) is equal to c_cap. The case that there's not enough
666 * space for all children to take their natural size needs some
667 * attention. The goals we want to achieve are:
669 * a) Maximize number of children taking their natural size.
670 * b) The allocated size of children should be a continuous
671 * function of c_gap. That is, increasing the container size by
672 * one pixel should never make drastic changes in the distribution.
673 * c) If child i takes its natural size and child j doesn't,
674 * child j should have received at least as much gap as child i.
676 * The following code distributes the additional space by following
680 /* Sort descending by gap and position. */
681 g_qsort_with_data (spreading,
682 n_requested_sizes, sizeof (guint),
685 /* Distribute available space.
686 * This master piece of a loop was conceived by Behdad Esfahbod.
688 for (i = n_requested_sizes - 1; extra_space > 0 && i >= 0; --i)
690 /* Divide remaining space by number of remaining children.
691 * Sort order and reducing remaining space by assigned space
692 * ensures that space is distributed equally.
694 gint glue = (extra_space + i) / (i + 1);
695 gint gap = sizes[(spreading[i])].natural_size
696 - sizes[(spreading[i])].minimum_size;
698 gint extra = MIN (glue, gap);
700 sizes[spreading[i]].minimum_size += extra;
702 extra_space -= extra;