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- /* GTK - The GIMP Toolkit
- * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
- *
- * GtkHWrapBox: Horizontal wrapping box widget
- * Copyright (C) 1999 Tim Janik
- *
- * 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, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
- #include "gtkhwrapbox.h"
- #include <math.h>
-
-
- /* --- prototypes --- */
- static void gtk_hwrap_box_class_init (GtkHWrapBoxClass *klass);
- static void gtk_hwrap_box_init (GtkHWrapBox *hwbox);
- static void gtk_hwrap_box_size_request (GtkWidget *widget,
- GtkRequisition *requisition);
- static void gtk_hwrap_box_size_allocate (GtkWidget *widget,
- GtkAllocation *allocation);
- static GSList* reverse_list_row_children (GtkWrapBox *wbox,
- GtkWrapBoxChild **child_p,
- GtkAllocation *area,
- guint *max_height,
- gboolean *can_vexpand);
-
-
- /* --- variables --- */
- static gpointer parent_class = NULL;
-
-
- /* --- functions --- */
- GtkType
- gtk_hwrap_box_get_type (void)
- {
- static GtkType hwrap_box_type = 0;
-
- if (!hwrap_box_type)
- {
- static const GtkTypeInfo hwrap_box_info =
- {
- "GtkHWrapBox",
- sizeof (GtkHWrapBox),
- sizeof (GtkHWrapBoxClass),
- (GtkClassInitFunc) gtk_hwrap_box_class_init,
- (GtkObjectInitFunc) gtk_hwrap_box_init,
- /* reserved_1 */ NULL,
- /* reserved_2 */ NULL,
- (GtkClassInitFunc) NULL,
- };
-
- hwrap_box_type = gtk_type_unique (GTK_TYPE_WRAP_BOX, &hwrap_box_info);
- }
-
- return hwrap_box_type;
- }
-
- static void
- gtk_hwrap_box_class_init (GtkHWrapBoxClass *class)
- {
- GtkObjectClass *object_class;
- GtkWidgetClass *widget_class;
- GtkContainerClass *container_class;
- GtkWrapBoxClass *wrap_box_class;
-
- object_class = GTK_OBJECT_CLASS (class);
- widget_class = GTK_WIDGET_CLASS (class);
- container_class = GTK_CONTAINER_CLASS (class);
- wrap_box_class = GTK_WRAP_BOX_CLASS (class);
-
- parent_class = gtk_type_class (GTK_TYPE_WRAP_BOX);
-
- widget_class->size_request = gtk_hwrap_box_size_request;
- widget_class->size_allocate = gtk_hwrap_box_size_allocate;
-
- wrap_box_class->rlist_line_children = reverse_list_row_children;
- }
-
- static void
- gtk_hwrap_box_init (GtkHWrapBox *hwbox)
- {
- hwbox->max_child_width = 0;
- hwbox->max_child_height = 0;
- }
-
- GtkWidget*
- gtk_hwrap_box_new (gboolean homogeneous)
- {
- GtkHWrapBox *hwbox;
-
- hwbox = GTK_HWRAP_BOX (gtk_widget_new (GTK_TYPE_HWRAP_BOX, NULL));
-
- GTK_WRAP_BOX (hwbox)->homogeneous = homogeneous ? TRUE : FALSE;
-
- return GTK_WIDGET (hwbox);
- }
-
- static inline void
- get_child_requisition (GtkWrapBox *wbox,
- GtkWidget *child,
- GtkRequisition *child_requisition)
- {
- if (wbox->homogeneous)
- {
- GtkHWrapBox *hwbox = GTK_HWRAP_BOX (wbox);
-
- child_requisition->width = hwbox->max_child_width;
- child_requisition->height = hwbox->max_child_height;
- }
- else
- gtk_widget_get_child_requisition (child, child_requisition);
- }
-
- #ifdef UNUSED_CODE
- static void
- _gtk_hwrap_box_size_request (GtkWidget *widget,
- GtkRequisition *requisition)
- {
- GtkHWrapBox *this = GTK_HWRAP_BOX (widget);
- GtkWrapBox *wbox = GTK_WRAP_BOX (widget);
- GtkWrapBoxChild *child;
- guint area = 0;
-
- g_return_if_fail (requisition != NULL);
-
- /*<h2v-off>*/
- requisition->width = 0;
- requisition->height = 0;
- this->max_child_width = 0;
- this->max_child_height = 0;
-
- for (child = wbox->children; child; child = child->next)
- if (GTK_WIDGET_VISIBLE (child->widget))
- {
- GtkRequisition child_requisition;
-
- gtk_widget_size_request (child->widget, &child_requisition);
-
- area += child_requisition.width * child_requisition.height;
- this->max_child_width = MAX (this->max_child_width, child_requisition.width);
- this->max_child_height = MAX (this->max_child_height, child_requisition.height);
- }
- if (wbox->homogeneous)
- area = this->max_child_width * this->max_child_height * wbox->n_children;
-
- if (area)
- {
- requisition->width = sqrt (area * wbox->aspect_ratio);
- requisition->height = area / requisition->width;
- }
- else
- {
- requisition->width = 0;
- requisition->height = 0;
- }
-
- requisition->width += GTK_CONTAINER (wbox)->border_width * 2;
- requisition->height += GTK_CONTAINER (wbox)->border_width * 2;
- /*<h2v-on>*/
- }
- #endif
-
- static gfloat
- get_layout_size (GtkHWrapBox *this,
- guint max_width,
- guint *width_inc)
- {
- GtkWrapBox *wbox = GTK_WRAP_BOX (this);
- GtkWrapBoxChild *child;
- guint n_rows, left_over = 0, total_height = 0;
- gboolean last_row_filled = TRUE;
-
- *width_inc = this->max_child_width + 1;
-
- n_rows = 0;
- for (child = wbox->children; child; child = child->next)
- {
- GtkWrapBoxChild *row_child;
- GtkRequisition child_requisition;
- guint row_width, row_height, n = 1;
-
- if (!GTK_WIDGET_VISIBLE (child->widget))
- continue;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
- if (!last_row_filled)
- *width_inc = MIN (*width_inc, child_requisition.width - left_over);
- row_width = child_requisition.width;
- row_height = child_requisition.height;
- for (row_child = child->next; row_child && n < wbox->child_limit; row_child = row_child->next)
- {
- if (GTK_WIDGET_VISIBLE (row_child->widget))
- {
- get_child_requisition (wbox, row_child->widget, &child_requisition);
- if (row_width + wbox->hspacing + child_requisition.width > max_width)
- break;
- row_width += wbox->hspacing + child_requisition.width;
- row_height = MAX (row_height, child_requisition.height);
- n++;
- }
- child = row_child;
- }
- last_row_filled = n >= wbox->child_limit;
- left_over = last_row_filled ? 0 : max_width - (row_width + wbox->hspacing);
- total_height += (n_rows ? wbox->vspacing : 0) + row_height;
- n_rows++;
- }
-
- if (*width_inc > this->max_child_width)
- *width_inc = 0;
-
- return MAX (total_height, 1);
- }
-
- static void
- gtk_hwrap_box_size_request (GtkWidget *widget,
- GtkRequisition *requisition)
- {
- GtkHWrapBox *this = GTK_HWRAP_BOX (widget);
- GtkWrapBox *wbox = GTK_WRAP_BOX (widget);
- GtkWrapBoxChild *child;
- gfloat ratio_dist, layout_width = 0;
- guint row_inc = 0;
-
- g_return_if_fail (requisition != NULL);
-
- requisition->width = 0;
- requisition->height = 0;
- this->max_child_width = 0;
- this->max_child_height = 0;
-
- /* size_request all children */
- for (child = wbox->children; child; child = child->next)
- if (GTK_WIDGET_VISIBLE (child->widget))
- {
- GtkRequisition child_requisition;
-
- gtk_widget_size_request (child->widget, &child_requisition);
-
- this->max_child_width = MAX (this->max_child_width, child_requisition.width);
- this->max_child_height = MAX (this->max_child_height, child_requisition.height);
- }
-
- /* figure all possible layouts */
- ratio_dist = 32768;
- layout_width = this->max_child_width;
- do
- {
- gfloat layout_height;
- gfloat ratio, dist;
-
- layout_width += row_inc;
- layout_height = get_layout_size (this, layout_width, &row_inc);
- ratio = layout_width / layout_height; /*<h2v-skip>*/
- dist = MAX (ratio, wbox->aspect_ratio) - MIN (ratio, wbox->aspect_ratio);
- if (dist < ratio_dist)
- {
- ratio_dist = dist;
- requisition->width = layout_width;
- requisition->height = layout_height;
- }
-
- /* g_print ("ratio for width %d height %d = %f\n",
- (gint) layout_width,
- (gint) layout_height,
- ratio);
- */
- }
- while (row_inc);
-
- requisition->width += GTK_CONTAINER (wbox)->border_width * 2; /*<h2v-skip>*/
- requisition->height += GTK_CONTAINER (wbox)->border_width * 2; /*<h2v-skip>*/
- /* g_print ("choosen: width %d, height %d\n",
- requisition->width,
- requisition->height);
- */
- }
-
- static GSList*
- reverse_list_row_children (GtkWrapBox *wbox,
- GtkWrapBoxChild **child_p,
- GtkAllocation *area,
- guint *max_child_size,
- gboolean *expand_line)
- {
- GSList *slist = NULL;
- guint width = 0, row_width = area->width;
- GtkWrapBoxChild *child = *child_p;
-
- *max_child_size = 0;
- *expand_line = FALSE;
-
- while (child && !GTK_WIDGET_VISIBLE (child->widget))
- {
- *child_p = child->next;
- child = *child_p;
- }
-
- if (child)
- {
- GtkRequisition child_requisition;
- guint n = 1;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
- width += child_requisition.width;
- *max_child_size = MAX (*max_child_size, child_requisition.height);
- *expand_line |= child->vexpand;
- slist = g_slist_prepend (slist, child);
- *child_p = child->next;
- child = *child_p;
-
- while (child && n < wbox->child_limit)
- {
- if (GTK_WIDGET_VISIBLE (child->widget))
- {
- get_child_requisition (wbox, child->widget, &child_requisition);
- if (width + wbox->hspacing + child_requisition.width > row_width ||
- child->forced_break)
- break;
- width += wbox->hspacing + child_requisition.width;
- *max_child_size = MAX (*max_child_size, child_requisition.height);
- *expand_line |= child->vexpand;
- slist = g_slist_prepend (slist, child);
- n++;
- }
- *child_p = child->next;
- child = *child_p;
- }
- }
-
- return slist;
- }
-
- static void
- layout_row (GtkWrapBox *wbox,
- GtkAllocation *area,
- GSList *children,
- guint children_per_line,
- gboolean vexpand)
- {
- GSList *slist;
- guint n_children = 0, n_expand_children = 0, have_expand_children = 0, total_width = 0;
- gfloat x, width, extra;
- GtkAllocation child_allocation;
-
- for (slist = children; slist; slist = slist->next)
- {
- GtkWrapBoxChild *child = slist->data;
- GtkRequisition child_requisition;
-
- n_children++;
- if (child->hexpand)
- n_expand_children++;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
- total_width += child_requisition.width;
- }
-
- width = MAX (1, area->width - (n_children - 1) * wbox->hspacing);
- if (width > total_width)
- extra = width - total_width;
- else
- extra = 0;
- have_expand_children = n_expand_children && extra;
-
- x = area->x;
- if (wbox->homogeneous)
- {
- width = MAX (1, area->width - (children_per_line - 1) * wbox->hspacing);
- width /= ((gdouble) children_per_line);
- extra = 0;
- }
- else if (have_expand_children && wbox->justify != GTK_JUSTIFY_FILL)
- {
- width = extra;
- extra /= ((gdouble) n_expand_children);
- }
- else
- {
- if (wbox->justify == GTK_JUSTIFY_FILL)
- {
- width = extra;
- have_expand_children = TRUE;
- n_expand_children = n_children;
- extra /= ((gdouble) n_expand_children);
- }
- else if (wbox->justify == GTK_JUSTIFY_CENTER)
- {
- x += extra / 2;
- width = 0;
- extra = 0;
- }
- else if (wbox->justify == GTK_JUSTIFY_LEFT)
- {
- width = 0;
- extra = 0;
- }
- else if (wbox->justify == GTK_JUSTIFY_RIGHT)
- {
- x += extra;
- width = 0;
- extra = 0;
- }
- }
-
- n_children = 0;
- for (slist = children; slist; slist = slist->next)
- {
- GtkWrapBoxChild *child = slist->data;
-
- child_allocation.x = x;
- child_allocation.y = area->y;
- if (wbox->homogeneous)
- {
- child_allocation.height = area->height;
- child_allocation.width = width;
- x += child_allocation.width + wbox->hspacing;
- }
- else
- {
- GtkRequisition child_requisition;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
-
- if (child_requisition.height >= area->height)
- child_allocation.height = area->height;
- else
- {
- child_allocation.height = child_requisition.height;
- if (wbox->line_justify == GTK_JUSTIFY_FILL || child->vfill)
- child_allocation.height = area->height;
- else if (child->vexpand || wbox->line_justify == GTK_JUSTIFY_CENTER)
- child_allocation.y += (area->height - child_requisition.height) / 2;
- else if (wbox->line_justify == GTK_JUSTIFY_BOTTOM)
- child_allocation.y += area->height - child_requisition.height;
- }
-
- if (have_expand_children)
- {
- child_allocation.width = child_requisition.width;
- if (child->hexpand || wbox->justify == GTK_JUSTIFY_FILL)
- {
- guint space;
-
- n_expand_children--;
- space = extra * n_expand_children;
- space = width - space;
- width -= space;
- if (child->hfill)
- child_allocation.width += space;
- else
- {
- child_allocation.x += space / 2;
- x += space;
- }
- }
- }
- else
- {
- /* g_print ("child_allocation.x %d += %d * %f ",
- child_allocation.x, n_children, extra); */
- child_allocation.x += n_children * extra;
- /* g_print ("= %d\n",
- child_allocation.x); */
- child_allocation.width = MIN (child_requisition.width,
- area->width - child_allocation.x + area->x);
- }
- }
-
- x += child_allocation.width + wbox->hspacing;
- gtk_widget_size_allocate (child->widget, &child_allocation);
- n_children++;
- }
- }
-
- typedef struct _Line Line;
- struct _Line
- {
- GSList *children;
- guint16 min_size;
- guint expand : 1;
- Line *next;
- };
-
- static void
- layout_rows (GtkWrapBox *wbox,
- GtkAllocation *area)
- {
- GtkWrapBoxChild *next_child;
- guint min_height;
- gboolean vexpand;
- GSList *slist;
- Line *line_list = NULL;
- guint total_height = 0, n_expand_lines = 0, n_lines = 0;
- gfloat shrink_height;
- guint children_per_line;
-
- next_child = wbox->children;
- slist = GTK_WRAP_BOX_GET_CLASS (wbox)->rlist_line_children (wbox,
- &next_child,
- area,
- &min_height,
- &vexpand);
- slist = g_slist_reverse (slist);
-
- children_per_line = g_slist_length (slist);
- while (slist)
- {
- Line *line = g_new (Line, 1);
-
- line->children = slist;
- line->min_size = min_height;
- total_height += min_height;
- line->expand = vexpand;
- if (vexpand)
- n_expand_lines++;
- line->next = line_list;
- line_list = line;
- n_lines++;
-
- slist = GTK_WRAP_BOX_GET_CLASS (wbox)->rlist_line_children (wbox,
- &next_child,
- area,
- &min_height,
- &vexpand);
- slist = g_slist_reverse (slist);
- }
-
- if (total_height > area->height)
- shrink_height = total_height - area->height;
- else
- shrink_height = 0;
-
- if (1) /* reverse lines and shrink */
- {
- Line *prev = NULL, *last = NULL;
- gfloat n_shrink_lines = n_lines;
-
- while (line_list)
- {
- Line *tmp = line_list->next;
-
- if (shrink_height)
- {
- Line *line = line_list;
- guint shrink_fract = shrink_height / n_shrink_lines + 0.5;
-
- if (line->min_size > shrink_fract)
- {
- shrink_height -= shrink_fract;
- line->min_size -= shrink_fract;
- }
- else
- {
- shrink_height -= line->min_size - 1;
- line->min_size = 1;
- }
- }
- n_shrink_lines--;
-
- last = line_list;
- line_list->next = prev;
- prev = line_list;
- line_list = tmp;
- }
- line_list = last;
- }
-
- if (n_lines)
- {
- Line *line;
- gfloat y, height, extra = 0;
-
- height = area->height;
- height = MAX (n_lines, height - (n_lines - 1) * wbox->vspacing);
-
- if (wbox->homogeneous)
- height /= ((gdouble) n_lines);
- else if (n_expand_lines)
- {
- height = MAX (0, height - total_height);
- extra = height / ((gdouble) n_expand_lines);
- }
- else
- height = 0;
-
- y = area->y;
- line = line_list;
- while (line)
- {
- GtkAllocation row_allocation;
- Line *next_line = line->next;
-
- row_allocation.x = area->x;
- row_allocation.width = area->width;
- if (wbox->homogeneous)
- row_allocation.height = height;
- else
- {
- row_allocation.height = line->min_size;
-
- if (line->expand)
- row_allocation.height += extra;
- }
-
- row_allocation.y = y;
-
- y += row_allocation.height + wbox->vspacing;
- layout_row (wbox,
- &row_allocation,
- line->children,
- children_per_line,
- line->expand);
-
- g_slist_free (line->children);
- g_free (line);
- line = next_line;
- }
- }
- }
-
- static void
- gtk_hwrap_box_size_allocate (GtkWidget *widget,
- GtkAllocation *allocation)
- {
- GtkWrapBox *wbox = GTK_WRAP_BOX (widget);
- GtkAllocation area;
- guint border = GTK_CONTAINER (wbox)->border_width; /*<h2v-skip>*/
-
- widget->allocation = *allocation;
- area.x = allocation->x + border;
- area.y = allocation->y + border;
- area.width = MAX (1, (gint) allocation->width - border * 2);
- area.height = MAX (1, (gint) allocation->height - border * 2);
-
- /*<h2v-off>*/
- /* g_print ("got: width %d, height %d\n",
- allocation->width,
- allocation->height);
- */
- /*<h2v-on>*/
-
- layout_rows (wbox, &area);
- }
-