/* gtksizerequest.c * Copyright (C) 2007-2010 Openismus GmbH * * Authors: * Mathias Hasselmann <mathias@openismus.com> * Tristan Van Berkom <tristan.van.berkom@gmail.com> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library. If not, see <http://www.gnu.org/licenses/>. */ #include <config.h> #include "gtksizerequest.h" #include "gtkdebug.h" #include "gtkintl.h" #include "gtkprivate.h" #include "gtksizegroup-private.h" #include "gtksizerequestcacheprivate.h" #include "gtkwidgetprivate.h" #include "gtkcssnodeprivate.h" #include "gtkcssnumbervalueprivate.h" #include "gtklayoutmanagerprivate.h" #ifdef G_ENABLE_CONSISTENCY_CHECKS static GQuark recursion_check_quark = 0; static void push_recursion_check (GtkWidget *widget, GtkOrientation orientation) { gboolean in_measure = FALSE; if (recursion_check_quark == 0) recursion_check_quark = g_quark_from_static_string ("gtk-size-request-in-progress"); in_measure = GPOINTER_TO_INT (g_object_get_qdata (G_OBJECT (widget), recursion_check_quark)); if (in_measure) { g_warning ("%s %p: widget tried to gtk_widget_measure inside " " GtkWidget::measure implementation. " "Should just invoke GTK_WIDGET_GET_CLASS(widget)->measure " "directly rather than using gtk_widget_measure", G_OBJECT_TYPE_NAME (widget), widget); } g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, GINT_TO_POINTER(TRUE)); } static void pop_recursion_check (GtkWidget *widget, GtkOrientation orientation) { g_object_set_qdata (G_OBJECT (widget), recursion_check_quark, NULL); } #else #define push_recursion_check(widget, orientation) #define pop_recursion_check(widget, orientation) #endif /* G_ENABLE_CONSISTENCY_CHECKS */ static GtkSizeRequestMode fetch_request_mode (GtkWidget *widget) { GtkLayoutManager *layout_manager = gtk_widget_get_layout_manager (widget); if (layout_manager != NULL) return gtk_layout_manager_get_request_mode (layout_manager); else return GTK_WIDGET_GET_CLASS (widget)->get_request_mode (widget); } static int get_number (GtkCssValue *value) { double d = _gtk_css_number_value_get (value, 100); if (d < 1) return ceil (d); else return floor (d); } /* Special-case min-width|height to round upwards, to avoid underalloc by 1px */ static int get_number_ceil (GtkCssValue *value) { return ceil (_gtk_css_number_value_get (value, 100)); } static void get_box_margin (GtkCssStyle *style, GtkBorder *margin) { margin->top = get_number (style->size->margin_top); margin->left = get_number (style->size->margin_left); margin->bottom = get_number (style->size->margin_bottom); margin->right = get_number (style->size->margin_right); } static void get_box_border (GtkCssStyle *style, GtkBorder *border) { border->top = get_number (style->border->border_top_width); border->left = get_number (style->border->border_left_width); border->bottom = get_number (style->border->border_bottom_width); border->right = get_number (style->border->border_right_width); } static void get_box_padding (GtkCssStyle *style, GtkBorder *border) { border->top = get_number (style->size->padding_top); border->left = get_number (style->size->padding_left); border->bottom = get_number (style->size->padding_bottom); border->right = get_number (style->size->padding_right); } static void gtk_widget_query_size_for_orientation (GtkWidget *widget, GtkOrientation orientation, int for_size, int *minimum, int *natural, int *minimum_baseline, int *natural_baseline) { SizeRequestCache *cache; int min_size = 0; int nat_size = 0; int min_baseline = -1; int nat_baseline = -1; gboolean found_in_cache; gtk_widget_ensure_resize (widget); /* We check the request mode first, to determine whether the widget even does * any wfh/hfw handling. If it doesn't, we reset for_size to -1 and ensure * that we only cache one size for the widget (i.e. a lot more cache hits). */ cache = _gtk_widget_peek_request_cache (widget); if (G_UNLIKELY (!cache->request_mode_valid)) { cache->request_mode = fetch_request_mode (widget); cache->request_mode_valid = TRUE; } if (cache->request_mode == GTK_SIZE_REQUEST_CONSTANT_SIZE) for_size = -1; found_in_cache = _gtk_size_request_cache_lookup (cache, orientation, for_size, &min_size, &nat_size, &min_baseline, &nat_baseline); if (!found_in_cache) { GtkWidgetClass *widget_class; GtkCssStyle *style; GtkBorder margin, border, padding; int adjusted_min, adjusted_natural; int reported_min_size = 0; int reported_nat_size = 0; int css_min_size; int css_min_for_size; int css_extra_for_size; int css_extra_size; int widget_margins_for_size; style = gtk_css_node_get_style (gtk_widget_get_css_node (widget)); get_box_margin (style, &margin); get_box_border (style, &border); get_box_padding (style, &padding); widget_class = GTK_WIDGET_GET_CLASS (widget); if (orientation == GTK_ORIENTATION_HORIZONTAL) { css_extra_size = margin.left + margin.right + border.left + border.right + padding.left + padding.right; css_extra_for_size = margin.top + margin.bottom + border.top + border.bottom + padding.top + padding.bottom; css_min_size = get_number_ceil (style->size->min_width); css_min_for_size = get_number_ceil (style->size->min_height); widget_margins_for_size = widget->priv->margin.top + widget->priv->margin.bottom; } else { css_extra_size = margin.top + margin.bottom + border.top + border.bottom + padding.top + padding.bottom; css_extra_for_size = margin.left + margin.right + border.left + border.right + padding.left + padding.right; css_min_size = get_number_ceil (style->size->min_height); css_min_for_size = get_number_ceil (style->size->min_width); widget_margins_for_size = widget->priv->margin.left + widget->priv->margin.right; } GtkLayoutManager *layout_manager = gtk_widget_get_layout_manager (widget); if (layout_manager != NULL) { if (for_size < 0) { push_recursion_check (widget, orientation); gtk_layout_manager_measure (layout_manager, widget, orientation, -1, &reported_min_size, &reported_nat_size, &min_baseline, &nat_baseline); pop_recursion_check (widget, orientation); } else { int adjusted_for_size; int minimum_for_size = 0; int natural_for_size = 0; /* Pull the minimum for_size from the cache as it's needed to adjust * the proposed 'for_size' */ gtk_layout_manager_measure (layout_manager, widget, OPPOSITE_ORIENTATION (orientation), -1, &minimum_for_size, &natural_for_size, NULL, NULL); if (minimum_for_size < css_min_for_size) minimum_for_size = css_min_for_size; if (for_size < minimum_for_size) for_size = minimum_for_size; adjusted_for_size = for_size - widget_margins_for_size; adjusted_for_size -= css_extra_for_size; if (adjusted_for_size < 0) adjusted_for_size = minimum_for_size; push_recursion_check (widget, orientation); gtk_layout_manager_measure (layout_manager, widget, orientation, adjusted_for_size, &reported_min_size, &reported_nat_size, &min_baseline, &nat_baseline); pop_recursion_check (widget, orientation); } } else { if (for_size < 0) { push_recursion_check (widget, orientation); widget_class->measure (widget, orientation, -1, &reported_min_size, &reported_nat_size, &min_baseline, &nat_baseline); pop_recursion_check (widget, orientation); } else { int adjusted_for_size; int minimum_for_size = 0; int natural_for_size = 0; /* Pull the minimum for_size from the cache as it's needed to adjust * the proposed 'for_size' */ gtk_widget_measure (widget, OPPOSITE_ORIENTATION (orientation), -1, &minimum_for_size, &natural_for_size, NULL, NULL); if (minimum_for_size < css_min_for_size) minimum_for_size = css_min_for_size; if (for_size < minimum_for_size) for_size = minimum_for_size; adjusted_for_size = for_size - widget_margins_for_size; adjusted_for_size -= css_extra_for_size; if (adjusted_for_size < 0) adjusted_for_size = minimum_for_size; push_recursion_check (widget, orientation); widget_class->measure (widget, orientation, adjusted_for_size, &reported_min_size, &reported_nat_size, &min_baseline, &nat_baseline); pop_recursion_check (widget, orientation); } } min_size = MAX (0, MAX (reported_min_size, css_min_size)) + css_extra_size; nat_size = MAX (0, MAX (reported_nat_size, css_min_size)) + css_extra_size; if (G_UNLIKELY (min_size > nat_size)) { if (orientation == GTK_ORIENTATION_HORIZONTAL) { g_warning ("%s %p (%s) reported min width %d and natural width %d in measure() with for_size=%d; natural size must be >= min size", G_OBJECT_TYPE_NAME (widget), widget, g_quark_to_string (gtk_css_node_get_name (gtk_widget_get_css_node (widget))), min_size, nat_size, for_size); } else { g_warning ("%s %p (%s) reported min height %d and natural height %d in measure() with for_size=%d; natural size must be >= min size", G_OBJECT_TYPE_NAME (widget), widget, g_quark_to_string (gtk_css_node_get_name (gtk_widget_get_css_node (widget))), min_size, nat_size, for_size); } nat_size = min_size; } else if (G_UNLIKELY (min_size < 0)) { g_warning ("%s %p (%s) reported min %s %d, but sizes must be >= 0", G_OBJECT_TYPE_NAME (widget), widget, g_quark_to_string (gtk_css_node_get_name (gtk_widget_get_css_node (widget))), orientation == GTK_ORIENTATION_HORIZONTAL ? "width" : "height", min_size); min_size = 0; nat_size = MAX (0, min_size); } adjusted_min = min_size; adjusted_natural = nat_size; gtk_widget_adjust_size_request (widget, orientation, &adjusted_min, &adjusted_natural); if (adjusted_min < min_size || adjusted_natural < nat_size) { g_warning ("%s %p adjusted size %s min %d natural %d must not decrease below min %d natural %d", G_OBJECT_TYPE_NAME (widget), widget, orientation == GTK_ORIENTATION_VERTICAL ? "vertical" : "horizontal", adjusted_min, adjusted_natural, min_size, nat_size); /* don't use the adjustment */ } else if (adjusted_min > adjusted_natural) { g_warning ("%s %p adjusted size %s min %d natural %d original min %d natural %d has min greater than natural", G_OBJECT_TYPE_NAME (widget), widget, orientation == GTK_ORIENTATION_VERTICAL ? "vertical" : "horizontal", adjusted_min, adjusted_natural, min_size, nat_size); /* don't use the adjustment */ } else { /* adjustment looks good */ min_size = adjusted_min; nat_size = adjusted_natural; } if (min_baseline != -1 || nat_baseline != -1) { if (orientation == GTK_ORIENTATION_HORIZONTAL) { g_warning ("%s %p reported a horizontal baseline", G_OBJECT_TYPE_NAME (widget), widget); min_baseline = -1; nat_baseline = -1; } else if (min_baseline == -1 || nat_baseline == -1) { g_warning ("%s %p reported baseline for only one of min/natural (min: %d, natural: %d)", G_OBJECT_TYPE_NAME (widget), widget, min_baseline, nat_baseline); min_baseline = -1; nat_baseline = -1; } else if (min_baseline > reported_min_size || nat_baseline > reported_nat_size || min_baseline < 0 || nat_baseline < 0) { g_warning ("%s %p reported baselines of minimum %d and natural %d, but sizes of " "minimum %d and natural %d. Baselines must be inside the widget size.", G_OBJECT_TYPE_NAME (widget), widget, min_baseline, nat_baseline, reported_min_size, reported_nat_size); min_baseline = -1; nat_baseline = -1; } else { if (css_min_size > reported_min_size) { min_baseline += (css_min_size - reported_min_size) / 2; nat_baseline += (css_min_size - reported_min_size) / 2; } min_baseline += margin.top + border.top + padding.top; nat_baseline += margin.top + border.top + padding.top; gtk_widget_adjust_baseline_request (widget, &min_baseline, &nat_baseline); } } _gtk_size_request_cache_commit (cache, orientation, for_size, min_size, nat_size, min_baseline, nat_baseline); } if (minimum) *minimum = min_size; if (natural) *natural = nat_size; if (minimum_baseline) *minimum_baseline = min_baseline; if (natural_baseline) *natural_baseline = nat_baseline; g_assert (min_size <= nat_size); GTK_DISPLAY_NOTE (_gtk_widget_get_display (widget), SIZE_REQUEST, { GString *s; s = g_string_new (""); g_string_append_printf (s, "[%p] %s\t%s: %d is minimum %d and natural: %d", widget, G_OBJECT_TYPE_NAME (widget), orientation == GTK_ORIENTATION_HORIZONTAL ? "width for height" : "height for width", for_size, min_size, nat_size); if (min_baseline != -1 || nat_baseline != -1) { g_string_append_printf (s, ", baseline %d/%d", min_baseline, nat_baseline); } g_string_append_printf (s, " (hit cache: %s)\n", found_in_cache ? "yes" : "no"); g_printerr ("%s", s->str); g_string_free (s, TRUE); }); } /** * gtk_widget_measure: * @widget: A `GtkWidget` instance * @orientation: the orientation to measure * @for_size: Size for the opposite of @orientation, i.e. * if @orientation is %GTK_ORIENTATION_HORIZONTAL, this is * the height the widget should be measured with. The %GTK_ORIENTATION_VERTICAL * case is analogous. This way, both height-for-width and width-for-height * requests can be implemented. If no size is known, -1 can be passed. * @minimum: (out) (optional): location to store the minimum size * @natural: (out) (optional): location to store the natural size * @minimum_baseline: (out) (optional): location to store the baseline * position for the minimum size, or -1 to report no baseline * @natural_baseline: (out) (optional): location to store the baseline * position for the natural size, or -1 to report no baseline * * Measures @widget in the orientation @orientation and for the given @for_size. * * As an example, if @orientation is %GTK_ORIENTATION_HORIZONTAL and @for_size * is 300, this functions will compute the minimum and natural width of @widget * if it is allocated at a height of 300 pixels. * * See [GtkWidget’s geometry management section](class.Widget.html#height-for-width-geometry-management) for * a more details on implementing `GtkWidgetClass.measure()`. */ void gtk_widget_measure (GtkWidget *widget, GtkOrientation orientation, int for_size, int *minimum, int *natural, int *minimum_baseline, int *natural_baseline) { g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (for_size >= -1); g_return_if_fail (orientation == GTK_ORIENTATION_HORIZONTAL || orientation == GTK_ORIENTATION_VERTICAL); if (for_size >= 0) { int min_opposite_size; gtk_widget_measure (widget, OPPOSITE_ORIENTATION (orientation), -1, &min_opposite_size, NULL, NULL, NULL); if (for_size < min_opposite_size) for_size = min_opposite_size; } /* This is the main function that checks for a cached size and * possibly queries the widget class to compute the size if it's * not cached. */ if (!_gtk_widget_get_visible (widget) && !GTK_IS_ROOT (widget)) { if (minimum) *minimum = 0; if (natural) *natural = 0; if (minimum_baseline) *minimum_baseline = -1; if (natural_baseline) *natural_baseline = -1; return; } if (G_LIKELY (!_gtk_widget_get_sizegroups (widget))) { gtk_widget_query_size_for_orientation (widget, orientation, for_size, minimum, natural, minimum_baseline, natural_baseline); } else { GHashTable *widgets; GHashTableIter iter; gpointer key; int min_result = 0, nat_result = 0; widgets = _gtk_size_group_get_widget_peers (widget, orientation); g_hash_table_iter_init (&iter, widgets); while (g_hash_table_iter_next (&iter, &key, NULL)) { GtkWidget *tmp_widget = key; int min_dimension, nat_dimension; gtk_widget_query_size_for_orientation (tmp_widget, orientation, for_size, &min_dimension, &nat_dimension, NULL, NULL); min_result = MAX (min_result, min_dimension); nat_result = MAX (nat_result, nat_dimension); } g_hash_table_destroy (widgets); /* Baselines make no sense with sizegroups really */ if (minimum_baseline) *minimum_baseline = -1; if (natural_baseline) *natural_baseline = -1; if (minimum) *minimum = min_result; if (natural) *natural = nat_result; } } /** * gtk_widget_get_request_mode: * @widget: a `GtkWidget` instance * * Gets whether the widget prefers a height-for-width layout * or a width-for-height layout. * * Single-child widgets generally propagate the preference of * their child, more complex widgets need to request something * either in context of their children or in context of their * allocation capabilities. * * Returns: The `GtkSizeRequestMode` preferred by @widget. */ GtkSizeRequestMode gtk_widget_get_request_mode (GtkWidget *widget) { SizeRequestCache *cache; cache = _gtk_widget_peek_request_cache (widget); if (G_UNLIKELY (!cache->request_mode_valid)) { cache->request_mode = fetch_request_mode (widget); cache->request_mode_valid = TRUE; } return cache->request_mode; } /** * gtk_widget_get_preferred_size: * @widget: a `GtkWidget` instance * @minimum_size: (out) (optional): location for storing the minimum size * @natural_size: (out) (optional): location for storing the natural size * * Retrieves the minimum and natural size of a widget, taking * into account the widget’s preference for height-for-width management. * * This is used to retrieve a suitable size by container widgets which do * not impose any restrictions on the child placement. It can be used * to deduce toplevel window and menu sizes as well as child widgets in * free-form containers such as `GtkFixed`. * * Handle with care. Note that the natural height of a height-for-width * widget will generally be a smaller size than the minimum height, since * the required height for the natural width is generally smaller than the * required height for the minimum width. * * Use [id@gtk_widget_measure] if you want to support baseline alignment. */ void gtk_widget_get_preferred_size (GtkWidget *widget, GtkRequisition *minimum_size, GtkRequisition *natural_size) { int min_width, nat_width; int min_height, nat_height; g_return_if_fail (GTK_IS_WIDGET (widget)); if (gtk_widget_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH) { gtk_widget_measure (widget, GTK_ORIENTATION_HORIZONTAL, -1, &min_width, &nat_width, NULL, NULL); if (minimum_size) { minimum_size->width = min_width; gtk_widget_measure (widget, GTK_ORIENTATION_VERTICAL, min_width, &minimum_size->height, NULL, NULL, NULL); } if (natural_size) { natural_size->width = nat_width; gtk_widget_measure (widget, GTK_ORIENTATION_VERTICAL, nat_width, NULL, &natural_size->height, NULL, NULL); } } else /* GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT or CONSTANT_SIZE */ { gtk_widget_measure (widget, GTK_ORIENTATION_VERTICAL, -1, &min_height, &nat_height, NULL, NULL); if (minimum_size) { minimum_size->height = min_height; gtk_widget_measure (widget, GTK_ORIENTATION_HORIZONTAL, min_height, &minimum_size->width, NULL, NULL, NULL); } if (natural_size) { natural_size->height = nat_height; gtk_widget_measure (widget, GTK_ORIENTATION_HORIZONTAL, nat_height, NULL, &natural_size->width, NULL, NULL); } } } static int compare_gap (gconstpointer p1, gconstpointer p2, gpointer data) { GtkRequestedSize *sizes = data; const guint *c1 = p1; const guint *c2 = p2; const int d1 = MAX (sizes[*c1].natural_size - sizes[*c1].minimum_size, 0); const int d2 = MAX (sizes[*c2].natural_size - sizes[*c2].minimum_size, 0); int delta = (d2 - d1); if (0 == delta) delta = (*c2 - *c1); return delta; } /** * gtk_distribute_natural_allocation: * @extra_space: Extra space to redistribute among children after subtracting * minimum sizes and any child padding from the overall allocation * @n_requested_sizes: Number of requests to fit into the allocation * @sizes: (array length=n_requested_sizes): An array of structs with a client pointer and a minimum/natural size * in the orientation of the allocation. * * Distributes @extra_space to child @sizes by bringing smaller * children up to natural size first. * * The remaining space will be added to the @minimum_size member of the * `GtkRequestedSize` struct. If all sizes reach their natural size then * the remaining space is returned. * * Returns: The remainder of @extra_space after redistributing space * to @sizes. */ int gtk_distribute_natural_allocation (int extra_space, guint n_requested_sizes, GtkRequestedSize *sizes) { guint *spreading; int i; g_return_val_if_fail (extra_space >= 0, 0); if (n_requested_sizes == 0) return extra_space; spreading = g_newa (guint, n_requested_sizes); for (i = 0; i < n_requested_sizes; i++) spreading[i] = i; /* Distribute the container's extra space c_gap. We want to assign * this space such that the sum of extra space assigned to children * (c^i_gap) is equal to c_cap. The case that there's not enough * space for all children to take their natural size needs some * attention. The goals we want to achieve are: * * a) Maximize number of children taking their natural size. * b) The allocated size of children should be a continuous * function of c_gap. That is, increasing the container size by * one pixel should never make drastic changes in the distribution. * c) If child i takes its natural size and child j doesn't, * child j should have received at least as much gap as child i. * * The following code distributes the additional space by following * these rules. */ /* Sort descending by gap and position. */ g_qsort_with_data (spreading, n_requested_sizes, sizeof (guint), compare_gap, sizes); /* Distribute available space. * This masterpiece of a loop was conceived by Behdad Esfahbod. */ for (i = n_requested_sizes - 1; extra_space > 0 && i >= 0; --i) { /* Divide remaining space by number of remaining children. * Sort order and reducing remaining space by assigned space * ensures that space is distributed equally. */ int glue = (extra_space + i) / (i + 1); int gap = sizes[(spreading[i])].natural_size - sizes[(spreading[i])].minimum_size; int extra = MIN (glue, gap); sizes[spreading[i]].minimum_size += extra; extra_space -= extra; } return extra_space; }