mirror of https://github.com/GNOME/gimp.git
609 lines
16 KiB
C
609 lines
16 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* GtkVWrapBox: Vertical wrapping box widget
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* Copyright (C) 1999 Tim Janik
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "gtkvwrapbox.h"
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#include "libgimpmath/gimpmath.h"
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/* --- prototypes --- */
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static void gtk_vwrap_box_class_init (GtkVWrapBoxClass *klass);
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static void gtk_vwrap_box_init (GtkVWrapBox *vwbox);
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static void gtk_vwrap_box_size_request (GtkWidget *widget,
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GtkRequisition *requisition);
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static void gtk_vwrap_box_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static GSList* reverse_list_col_children (GtkWrapBox *wbox,
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GtkWrapBoxChild **child_p,
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GtkAllocation *area,
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guint *max_width,
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gboolean *can_hexpand);
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/* --- variables --- */
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static gpointer parent_class = NULL;
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/* --- functions --- */
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GType
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gtk_vwrap_box_get_type (void)
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{
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static GType vwrap_box_type = 0;
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if (!vwrap_box_type)
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{
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static const GTypeInfo vwrap_box_info =
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{
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sizeof (GtkVWrapBoxClass),
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NULL, /* base_init */
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NULL, /* base_finalize */
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(GClassInitFunc) gtk_vwrap_box_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GtkVWrapBox),
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0, /* n_preallocs */
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(GInstanceInitFunc) gtk_vwrap_box_init,
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};
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vwrap_box_type = g_type_register_static (GTK_TYPE_WRAP_BOX, "GtkVWrapBox",
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&vwrap_box_info, 0);
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}
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return vwrap_box_type;
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}
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static void
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gtk_vwrap_box_class_init (GtkVWrapBoxClass *class)
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{
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GObjectClass *object_class;
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GtkWidgetClass *widget_class;
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GtkContainerClass *container_class;
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GtkWrapBoxClass *wrap_box_class;
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object_class = G_OBJECT_CLASS (class);
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widget_class = GTK_WIDGET_CLASS (class);
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container_class = GTK_CONTAINER_CLASS (class);
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wrap_box_class = GTK_WRAP_BOX_CLASS (class);
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parent_class = g_type_class_peek_parent (class);
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widget_class->size_request = gtk_vwrap_box_size_request;
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widget_class->size_allocate = gtk_vwrap_box_size_allocate;
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wrap_box_class->rlist_line_children = reverse_list_col_children;
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}
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static void
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gtk_vwrap_box_init (GtkVWrapBox *vwbox)
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{
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vwbox->max_child_height = 0;
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vwbox->max_child_width = 0;
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}
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GtkWidget*
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gtk_vwrap_box_new (gboolean homogeneous)
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{
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return g_object_new (GTK_TYPE_VWRAP_BOX, "homogeneous", homogeneous, NULL);
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}
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static inline void
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get_child_requisition (GtkWrapBox *wbox,
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GtkWidget *child,
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GtkRequisition *child_requisition)
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{
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if (wbox->homogeneous)
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{
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GtkVWrapBox *vwbox = GTK_VWRAP_BOX (wbox);
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child_requisition->height = vwbox->max_child_height;
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child_requisition->width = vwbox->max_child_width;
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}
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else
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gtk_widget_get_child_requisition (child, child_requisition);
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}
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static gfloat
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get_layout_size (GtkVWrapBox *this,
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guint max_height,
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guint *height_inc)
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{
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GtkWrapBox *wbox = GTK_WRAP_BOX (this);
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GtkWrapBoxChild *child;
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guint n_cols, left_over = 0, total_width = 0;
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gboolean last_col_filled = TRUE;
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*height_inc = this->max_child_height + 1;
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n_cols = 0;
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for (child = wbox->children; child; child = child->next)
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{
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GtkWrapBoxChild *col_child;
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GtkRequisition child_requisition;
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guint col_height, col_width, n = 1;
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if (!GTK_WIDGET_VISIBLE (child->widget))
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continue;
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get_child_requisition (wbox, child->widget, &child_requisition);
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if (!last_col_filled)
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*height_inc = MIN (*height_inc, child_requisition.height - left_over);
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col_height = child_requisition.height;
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col_width = child_requisition.width;
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for (col_child = child->next; col_child && n < wbox->child_limit; col_child = col_child->next)
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{
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if (GTK_WIDGET_VISIBLE (col_child->widget))
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{
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get_child_requisition (wbox, col_child->widget, &child_requisition);
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if (col_height + wbox->vspacing + child_requisition.height > max_height)
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break;
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col_height += wbox->vspacing + child_requisition.height;
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col_width = MAX (col_width, child_requisition.width);
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n++;
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}
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child = col_child;
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}
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last_col_filled = n >= wbox->child_limit;
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left_over = last_col_filled ? 0 : max_height - (col_height + wbox->vspacing);
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total_width += (n_cols ? wbox->hspacing : 0) + col_width;
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n_cols++;
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}
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if (*height_inc > this->max_child_height)
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*height_inc = 0;
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return MAX (total_width, 1);
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}
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static void
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gtk_vwrap_box_size_request (GtkWidget *widget,
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GtkRequisition *requisition)
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{
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GtkVWrapBox *this = GTK_VWRAP_BOX (widget);
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GtkWrapBox *wbox = GTK_WRAP_BOX (widget);
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GtkWrapBoxChild *child;
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gfloat ratio_dist, layout_height = 0;
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guint col_inc = 0;
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g_return_if_fail (requisition != NULL);
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requisition->height = 0;
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requisition->width = 0;
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this->max_child_height = 0;
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this->max_child_width = 0;
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/* size_request all children */
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for (child = wbox->children; child; child = child->next)
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if (GTK_WIDGET_VISIBLE (child->widget))
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{
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GtkRequisition child_requisition;
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gtk_widget_size_request (child->widget, &child_requisition);
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this->max_child_height = MAX (this->max_child_height, child_requisition.height);
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this->max_child_width = MAX (this->max_child_width, child_requisition.width);
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}
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/* figure all possible layouts */
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ratio_dist = 32768;
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layout_height = this->max_child_height;
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do
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{
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gfloat layout_width;
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gfloat ratio, dist;
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layout_height += col_inc;
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layout_width = get_layout_size (this, layout_height, &col_inc);
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ratio = layout_width / layout_height; /*<h2v-skip>*/
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dist = MAX (ratio, wbox->aspect_ratio) - MIN (ratio, wbox->aspect_ratio);
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if (dist < ratio_dist)
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{
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ratio_dist = dist;
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requisition->height = layout_height;
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requisition->width = layout_width;
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}
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/* g_print ("ratio for height %d width %d = %f\n",
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(gint) layout_height,
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(gint) layout_width,
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ratio);
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*/
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}
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while (col_inc);
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requisition->width += GTK_CONTAINER (wbox)->border_width * 2; /*<h2v-skip>*/
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requisition->height += GTK_CONTAINER (wbox)->border_width * 2; /*<h2v-skip>*/
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/* g_print ("choosen: height %d, width %d\n",
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requisition->height,
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requisition->width);
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*/
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}
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static GSList*
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reverse_list_col_children (GtkWrapBox *wbox,
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GtkWrapBoxChild **child_p,
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GtkAllocation *area,
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guint *max_child_size,
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gboolean *expand_line)
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{
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GSList *slist = NULL;
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guint height = 0, col_height = area->height;
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GtkWrapBoxChild *child = *child_p;
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*max_child_size = 0;
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*expand_line = FALSE;
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while (child && !GTK_WIDGET_VISIBLE (child->widget))
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{
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*child_p = child->next;
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child = *child_p;
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}
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if (child)
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{
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GtkRequisition child_requisition;
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guint n = 1;
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get_child_requisition (wbox, child->widget, &child_requisition);
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height += child_requisition.height;
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*max_child_size = MAX (*max_child_size, child_requisition.width);
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*expand_line |= child->hexpand;
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slist = g_slist_prepend (slist, child);
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*child_p = child->next;
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child = *child_p;
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while (child && n < wbox->child_limit)
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{
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if (GTK_WIDGET_VISIBLE (child->widget))
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{
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get_child_requisition (wbox, child->widget, &child_requisition);
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if (height + wbox->vspacing + child_requisition.height > col_height ||
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child->wrapped)
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break;
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height += wbox->vspacing + child_requisition.height;
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*max_child_size = MAX (*max_child_size, child_requisition.width);
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*expand_line |= child->hexpand;
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slist = g_slist_prepend (slist, child);
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n++;
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}
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*child_p = child->next;
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child = *child_p;
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}
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}
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return slist;
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}
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static void
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layout_col (GtkWrapBox *wbox,
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GtkAllocation *area,
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GSList *children,
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guint children_per_line,
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gboolean hexpand)
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{
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GSList *slist;
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guint n_children = 0, n_expand_children = 0, have_expand_children = 0;
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gint total_height = 0;
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gfloat y, height, extra;
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GtkAllocation child_allocation;
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for (slist = children; slist; slist = slist->next)
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{
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GtkWrapBoxChild *child = slist->data;
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GtkRequisition child_requisition;
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n_children++;
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if (child->vexpand)
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n_expand_children++;
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get_child_requisition (wbox, child->widget, &child_requisition);
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total_height += child_requisition.height;
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}
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height = MAX (1, area->height - (n_children - 1) * wbox->vspacing);
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if (height > total_height)
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extra = height - total_height;
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else
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extra = 0;
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have_expand_children = n_expand_children && extra;
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y = area->y;
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if (wbox->homogeneous)
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{
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height = MAX (1, area->height - (children_per_line - 1) * wbox->vspacing);
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height /= ((gdouble) children_per_line);
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extra = 0;
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}
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else if (have_expand_children && wbox->justify != GTK_JUSTIFY_FILL)
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{
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height = extra;
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extra /= ((gdouble) n_expand_children);
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}
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else
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{
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if (wbox->justify == GTK_JUSTIFY_FILL)
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{
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height = extra;
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have_expand_children = TRUE;
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n_expand_children = n_children;
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extra /= ((gdouble) n_expand_children);
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}
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else if (wbox->justify == GTK_JUSTIFY_CENTER)
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{
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y += extra / 2;
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height = 0;
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extra = 0;
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}
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else if (wbox->justify == GTK_JUSTIFY_LEFT)
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{
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height = 0;
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extra = 0;
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}
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else if (wbox->justify == GTK_JUSTIFY_RIGHT)
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{
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y += extra;
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height = 0;
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extra = 0;
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}
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}
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n_children = 0;
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for (slist = children; slist; slist = slist->next)
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{
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GtkWrapBoxChild *child = slist->data;
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child_allocation.y = y;
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child_allocation.x = area->x;
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if (wbox->homogeneous)
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{
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child_allocation.width = area->width;
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child_allocation.height = height;
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y += child_allocation.height + wbox->vspacing;
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}
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else
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{
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GtkRequisition child_requisition;
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get_child_requisition (wbox, child->widget, &child_requisition);
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if (child_requisition.width >= area->width)
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child_allocation.width = area->width;
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else
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{
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child_allocation.width = child_requisition.width;
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if (wbox->line_justify == GTK_JUSTIFY_FILL || child->hfill)
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child_allocation.width = area->width;
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else if (child->hexpand || wbox->line_justify == GTK_JUSTIFY_CENTER)
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child_allocation.x += (area->width - child_requisition.width) / 2;
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else if (wbox->line_justify == GTK_JUSTIFY_BOTTOM)
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child_allocation.x += area->width - child_requisition.width;
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}
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if (have_expand_children)
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{
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child_allocation.height = child_requisition.height;
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if (child->vexpand || wbox->justify == GTK_JUSTIFY_FILL)
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{
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guint space;
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n_expand_children--;
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space = extra * n_expand_children;
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space = height - space;
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height -= space;
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if (child->vfill)
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child_allocation.height += space;
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else
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{
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child_allocation.y += space / 2;
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y += space;
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}
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}
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}
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else
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{
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/* g_print ("child_allocation.y %d += %d * %f ",
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child_allocation.y, n_children, extra); */
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child_allocation.y += n_children * extra;
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/* g_print ("= %d\n",
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child_allocation.y); */
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child_allocation.height = MIN (child_requisition.height,
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area->height - child_allocation.y + area->y);
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}
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}
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y += child_allocation.height + wbox->vspacing;
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gtk_widget_size_allocate (child->widget, &child_allocation);
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n_children++;
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}
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}
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typedef struct _Line Line;
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struct _Line
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{
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GSList *children;
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guint16 min_size;
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guint expand : 1;
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Line *next;
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};
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static void
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layout_cols (GtkWrapBox *wbox,
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GtkAllocation *area)
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{
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GtkWrapBoxChild *next_child;
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guint min_width;
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gboolean hexpand;
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GSList *slist;
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Line *line_list = NULL;
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guint total_width = 0, n_expand_lines = 0, n_lines = 0;
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gfloat shrink_width;
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guint children_per_line;
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next_child = wbox->children;
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slist = GTK_WRAP_BOX_GET_CLASS (wbox)->rlist_line_children (wbox,
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&next_child,
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area,
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&min_width,
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&hexpand);
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slist = g_slist_reverse (slist);
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children_per_line = g_slist_length (slist);
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while (slist)
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{
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Line *line = g_new (Line, 1);
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line->children = slist;
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line->min_size = min_width;
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total_width += min_width;
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line->expand = hexpand;
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if (hexpand)
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n_expand_lines++;
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line->next = line_list;
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line_list = line;
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n_lines++;
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slist = GTK_WRAP_BOX_GET_CLASS (wbox)->rlist_line_children (wbox,
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&next_child,
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area,
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&min_width,
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&hexpand);
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slist = g_slist_reverse (slist);
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}
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if (total_width > area->width)
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shrink_width = total_width - area->width;
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else
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shrink_width = 0;
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if (1) /* reverse lines and shrink */
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{
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Line *prev = NULL, *last = NULL;
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gfloat n_shrink_lines = n_lines;
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while (line_list)
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{
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Line *tmp = line_list->next;
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if (shrink_width)
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{
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Line *line = line_list;
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guint shrink_fract = shrink_width / n_shrink_lines + 0.5;
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if (line->min_size > shrink_fract)
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{
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shrink_width -= shrink_fract;
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line->min_size -= shrink_fract;
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}
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else
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{
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shrink_width -= line->min_size - 1;
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line->min_size = 1;
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}
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}
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n_shrink_lines--;
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last = line_list;
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line_list->next = prev;
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|
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;
|
|
gint 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);
|
|
}
|