home *** CD-ROM | disk | FTP | other *** search
- /* GTK - The GIMP Toolkit
- * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
- *
- * GtkVWrapBox: Vertical 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 "gtkvwrapbox.h"
- #include <math.h>
-
-
- /* --- prototypes --- */
- static void gtk_vwrap_box_class_init (GtkVWrapBoxClass *klass);
- static void gtk_vwrap_box_init (GtkVWrapBox *vwbox);
- static void gtk_vwrap_box_size_request (GtkWidget *widget,
- GtkRequisition *requisition);
- static void gtk_vwrap_box_size_allocate (GtkWidget *widget,
- GtkAllocation *allocation);
- static GSList* reverse_list_col_children (GtkWrapBox *wbox,
- GtkWrapBoxChild **child_p,
- GtkAllocation *area,
- guint *max_width,
- gboolean *can_hexpand);
-
-
- /* --- variables --- */
- static gpointer parent_class = NULL;
-
-
- /* --- functions --- */
- GtkType
- gtk_vwrap_box_get_type (void)
- {
- static GtkType vwrap_box_type = 0;
-
- if (!vwrap_box_type)
- {
- static const GtkTypeInfo vwrap_box_info =
- {
- "GtkVWrapBox",
- sizeof (GtkVWrapBox),
- sizeof (GtkVWrapBoxClass),
- (GtkClassInitFunc) gtk_vwrap_box_class_init,
- (GtkObjectInitFunc) gtk_vwrap_box_init,
- /* reserved_1 */ NULL,
- /* reserved_2 */ NULL,
- (GtkClassInitFunc) NULL,
- };
-
- vwrap_box_type = gtk_type_unique (GTK_TYPE_WRAP_BOX, &vwrap_box_info);
- }
-
- return vwrap_box_type;
- }
-
- static void
- gtk_vwrap_box_class_init (GtkVWrapBoxClass *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_vwrap_box_size_request;
- widget_class->size_allocate = gtk_vwrap_box_size_allocate;
-
- wrap_box_class->rlist_line_children = reverse_list_col_children;
- }
-
- static void
- gtk_vwrap_box_init (GtkVWrapBox *vwbox)
- {
- vwbox->max_child_height = 0;
- vwbox->max_child_width = 0;
- }
-
- GtkWidget*
- gtk_vwrap_box_new (gboolean homogeneous)
- {
- GtkVWrapBox *vwbox;
-
- vwbox = GTK_VWRAP_BOX (gtk_widget_new (GTK_TYPE_VWRAP_BOX, NULL));
-
- GTK_WRAP_BOX (vwbox)->homogeneous = homogeneous ? TRUE : FALSE;
-
- return GTK_WIDGET (vwbox);
- }
-
- static inline void
- get_child_requisition (GtkWrapBox *wbox,
- GtkWidget *child,
- GtkRequisition *child_requisition)
- {
- if (wbox->homogeneous)
- {
- GtkVWrapBox *vwbox = GTK_VWRAP_BOX (wbox);
-
- child_requisition->height = vwbox->max_child_height;
- child_requisition->width = vwbox->max_child_width;
- }
- else
- gtk_widget_get_child_requisition (child, child_requisition);
- }
-
- #ifdef UNUSED_CODE
- static void
- _gtk_vwrap_box_size_request (GtkWidget *widget,
- GtkRequisition *requisition)
- {
- GtkVWrapBox *this = GTK_VWRAP_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 (GtkVWrapBox *this,
- guint max_height,
- guint *height_inc)
- {
- GtkWrapBox *wbox = GTK_WRAP_BOX (this);
- GtkWrapBoxChild *child;
- guint n_cols, left_over = 0, total_width = 0;
- gboolean last_col_filled = TRUE;
-
- *height_inc = this->max_child_height + 1;
-
- n_cols = 0;
- for (child = wbox->children; child; child = child->next)
- {
- GtkWrapBoxChild *col_child;
- GtkRequisition child_requisition;
- guint col_height, col_width, n = 1;
-
- if (!GTK_WIDGET_VISIBLE (child->widget))
- continue;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
- if (!last_col_filled)
- *height_inc = MIN (*height_inc, child_requisition.height - left_over);
- col_height = child_requisition.height;
- col_width = child_requisition.width;
- for (col_child = child->next; col_child && n < wbox->child_limit; col_child = col_child->next)
- {
- if (GTK_WIDGET_VISIBLE (col_child->widget))
- {
- get_child_requisition (wbox, col_child->widget, &child_requisition);
- if (col_height + wbox->vspacing + child_requisition.height > max_height)
- break;
- col_height += wbox->vspacing + child_requisition.height;
- col_width = MAX (col_width, child_requisition.width);
- n++;
- }
- child = col_child;
- }
- last_col_filled = n >= wbox->child_limit;
- left_over = last_col_filled ? 0 : max_height - (col_height + wbox->vspacing);
- total_width += (n_cols ? wbox->hspacing : 0) + col_width;
- n_cols++;
- }
-
- if (*height_inc > this->max_child_height)
- *height_inc = 0;
-
- return MAX (total_width, 1);
- }
-
- static void
- gtk_vwrap_box_size_request (GtkWidget *widget,
- GtkRequisition *requisition)
- {
- GtkVWrapBox *this = GTK_VWRAP_BOX (widget);
- GtkWrapBox *wbox = GTK_WRAP_BOX (widget);
- GtkWrapBoxChild *child;
- gfloat ratio_dist, layout_height = 0;
- guint col_inc = 0;
-
- g_return_if_fail (requisition != NULL);
-
- requisition->height = 0;
- requisition->width = 0;
- this->max_child_height = 0;
- this->max_child_width = 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_height = MAX (this->max_child_height, child_requisition.height);
- this->max_child_width = MAX (this->max_child_width, child_requisition.width);
- }
-
- /* figure all possible layouts */
- ratio_dist = 32768;
- layout_height = this->max_child_height;
- do
- {
- gfloat layout_width;
- gfloat ratio, dist;
-
- layout_height += col_inc;
- layout_width = get_layout_size (this, layout_height, &col_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->height = layout_height;
- requisition->width = layout_width;
- }
-
- /* g_print ("ratio for height %d width %d = %f\n",
- (gint) layout_height,
- (gint) layout_width,
- ratio);
- */
- }
- while (col_inc);
-
- requisition->width += GTK_CONTAINER (wbox)->border_width * 2; /*<h2v-skip>*/
- requisition->height += GTK_CONTAINER (wbox)->border_width * 2; /*<h2v-skip>*/
- /* g_print ("choosen: height %d, width %d\n",
- requisition->height,
- requisition->width);
- */
- }
-
- static GSList*
- reverse_list_col_children (GtkWrapBox *wbox,
- GtkWrapBoxChild **child_p,
- GtkAllocation *area,
- guint *max_child_size,
- gboolean *expand_line)
- {
- GSList *slist = NULL;
- guint height = 0, col_height = area->height;
- 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);
- height += child_requisition.height;
- *max_child_size = MAX (*max_child_size, child_requisition.width);
- *expand_line |= child->hexpand;
- 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 (height + wbox->vspacing + child_requisition.height > col_height ||
- child->forced_break)
- break;
- height += wbox->vspacing + child_requisition.height;
- *max_child_size = MAX (*max_child_size, child_requisition.width);
- *expand_line |= child->hexpand;
- slist = g_slist_prepend (slist, child);
- n++;
- }
- *child_p = child->next;
- child = *child_p;
- }
- }
-
- return slist;
- }
-
- static void
- layout_col (GtkWrapBox *wbox,
- GtkAllocation *area,
- GSList *children,
- guint children_per_line,
- gboolean hexpand)
- {
- GSList *slist;
- guint n_children = 0, n_expand_children = 0, have_expand_children = 0, total_height = 0;
- gfloat y, height, extra;
- GtkAllocation child_allocation;
-
- for (slist = children; slist; slist = slist->next)
- {
- GtkWrapBoxChild *child = slist->data;
- GtkRequisition child_requisition;
-
- n_children++;
- if (child->vexpand)
- n_expand_children++;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
- total_height += child_requisition.height;
- }
-
- height = MAX (1, area->height - (n_children - 1) * wbox->vspacing);
- if (height > total_height)
- extra = height - total_height;
- else
- extra = 0;
- have_expand_children = n_expand_children && extra;
-
- y = area->y;
- if (wbox->homogeneous)
- {
- height = MAX (1, area->height - (children_per_line - 1) * wbox->vspacing);
- height /= ((gdouble) children_per_line);
- extra = 0;
- }
- else if (have_expand_children && wbox->justify != GTK_JUSTIFY_FILL)
- {
- height = extra;
- extra /= ((gdouble) n_expand_children);
- }
- else
- {
- if (wbox->justify == GTK_JUSTIFY_FILL)
- {
- height = extra;
- have_expand_children = TRUE;
- n_expand_children = n_children;
- extra /= ((gdouble) n_expand_children);
- }
- else if (wbox->justify == GTK_JUSTIFY_CENTER)
- {
- y += extra / 2;
- height = 0;
- extra = 0;
- }
- else if (wbox->justify == GTK_JUSTIFY_LEFT)
- {
- height = 0;
- extra = 0;
- }
- else if (wbox->justify == GTK_JUSTIFY_RIGHT)
- {
- y += extra;
- height = 0;
- extra = 0;
- }
- }
-
- n_children = 0;
- for (slist = children; slist; slist = slist->next)
- {
- GtkWrapBoxChild *child = slist->data;
-
- child_allocation.y = y;
- child_allocation.x = area->x;
- if (wbox->homogeneous)
- {
- child_allocation.width = area->width;
- child_allocation.height = height;
- y += child_allocation.height + wbox->vspacing;
- }
- else
- {
- GtkRequisition child_requisition;
-
- get_child_requisition (wbox, child->widget, &child_requisition);
-
- if (child_requisition.width >= area->width)
- child_allocation.width = area->width;
- else
- {
- child_allocation.width = child_requisition.width;
- if (wbox->line_justify == GTK_JUSTIFY_FILL || child->hfill)
- child_allocation.width = area->width;
- else if (child->hexpand || wbox->line_justify == GTK_JUSTIFY_CENTER)
- child_allocation.x += (area->width - child_requisition.width) / 2;
- else if (wbox->line_justify == GTK_JUSTIFY_BOTTOM)
- child_allocation.x += area->width - child_requisition.width;
- }
-
- if (have_expand_children)
- {
- child_allocation.height = child_requisition.height;
- if (child->vexpand || wbox->justify == GTK_JUSTIFY_FILL)
- {
- guint space;
-
- n_expand_children--;
- space = extra * n_expand_children;
- space = height - space;
- height -= space;
- if (child->vfill)
- child_allocation.height += space;
- else
- {
- child_allocation.y += space / 2;
- y += space;
- }
- }
- }
- else
- {
- /* g_print ("child_allocation.y %d += %d * %f ",
- child_allocation.y, n_children, extra); */
- child_allocation.y += n_children * extra;
- /* g_print ("= %d\n",
- child_allocation.y); */
- child_allocation.height = MIN (child_requisition.height,
- area->height - child_allocation.y + area->y);
- }
- }
-
- y += child_allocation.height + wbox->vspacing;
- 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_cols (GtkWrapBox *wbox,
- GtkAllocation *area)
- {
- GtkWrapBoxChild *next_child;
- guint min_width;
- gboolean hexpand;
- GSList *slist;
- Line *line_list = NULL;
- guint total_width = 0, n_expand_lines = 0, n_lines = 0;
- gfloat shrink_width;
- guint children_per_line;
-
- next_child = wbox->children;
- slist = GTK_WRAP_BOX_GET_CLASS (wbox)->rlist_line_children (wbox,
- &next_child,
- area,
- &min_width,
- &hexpand);
- 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_width;
- total_width += min_width;
- line->expand = hexpand;
- if (hexpand)
- 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_width,
- &hexpand);
- slist = g_slist_reverse (slist);
- }
-
- if (total_width > area->width)
- shrink_width = total_width - area->width;
- else
- shrink_width = 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_width)
- {
- Line *line = line_list;
- guint shrink_fract = shrink_width / n_shrink_lines + 0.5;
-
- if (line->min_size > shrink_fract)
- {
- shrink_width -= shrink_fract;
- line->min_size -= shrink_fract;
- }
- else
- {
- shrink_width -= 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 x, width, extra = 0;
-
- width = area->width;
- width = MAX (n_lines, width - (n_lines - 1) * wbox->hspacing);
-
- if (wbox->homogeneous)
- width /= ((gdouble) n_lines);
- else if (n_expand_lines)
- {
- width = MAX (0, width - total_width);
- extra = width / ((gdouble) n_expand_lines);
- }
- else
- width = 0;
-
- x = area->x;
- line = line_list;
- while (line)
- {
- GtkAllocation col_allocation;
- Line *next_line = line->next;
-
- col_allocation.y = area->y;
- col_allocation.height = area->height;
- if (wbox->homogeneous)
- col_allocation.width = width;
- else
- {
- col_allocation.width = line->min_size;
-
- if (line->expand)
- col_allocation.width += extra;
- }
-
- col_allocation.x = x;
-
- x += col_allocation.width + wbox->hspacing;
- layout_col (wbox,
- &col_allocation,
- line->children,
- children_per_line,
- line->expand);
-
- g_slist_free (line->children);
- g_free (line);
- line = next_line;
- }
- }
- }
-
- static void
- gtk_vwrap_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.y = allocation->y + border;
- area.x = allocation->x + border;
- area.height = MAX (1, (gint) allocation->height - border * 2);
- area.width = MAX (1, (gint) allocation->width - border * 2);
-
- /*<h2v-off>*/
- /* g_print ("got: width %d, height %d\n",
- allocation->width,
- allocation->height);
- */
- /*<h2v-on>*/
-
- layout_cols (wbox, &area);
- }
-