forked from AuroraMiddleware/gtk
c5c75ece06
Mon Jun 26 19:37:04 2000 Owen Taylor <otaylor@redhat.com>
* configure.in: Put 1.3.1 in warning message, not 1.3.0.
(Fixes problem with drawing childless frames. Pointed out
by and a first patch from Anders)
* gtk/gtkframe.c (gtk_frame_compute_child_allocation): Always
compute a child_allocation, even if we don't have a child.
* gtk/gtkaspectframe.c (gtk_aspect_frame_compute_child_allocation):
Always chain to the parent's impl, even if we don't have a child.
288 lines
8.3 KiB
C
288 lines
8.3 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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* GtkAspectFrame: Ensure that the child window has a specified aspect ratio
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* or, if obey_child, has the same aspect ratio as its requested size
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*
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* Copyright Owen Taylor 4/9/97
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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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/*
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* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "gtkaspectframe.h"
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enum {
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ARG_0,
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ARG_XALIGN,
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ARG_YALIGN,
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ARG_RATIO,
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ARG_OBEY_CHILD
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};
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static void gtk_aspect_frame_class_init (GtkAspectFrameClass *klass);
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static void gtk_aspect_frame_init (GtkAspectFrame *aspect_frame);
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static void gtk_aspect_frame_set_arg (GtkObject *object,
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GtkArg *arg,
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guint arg_id);
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static void gtk_aspect_frame_get_arg (GtkObject *object,
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GtkArg *arg,
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guint arg_id);
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static void gtk_aspect_frame_compute_child_allocation (GtkFrame *frame,
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GtkAllocation *child_allocation);
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#define MAX_RATIO 10000.0
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#define MIN_RATIO 0.0001
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static GtkFrameClass *parent_class = NULL;
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GtkType
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gtk_aspect_frame_get_type (void)
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{
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static GtkType aspect_frame_type = 0;
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if (!aspect_frame_type)
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{
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static const GtkTypeInfo aspect_frame_info =
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{
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"GtkAspectFrame",
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sizeof (GtkAspectFrame),
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sizeof (GtkAspectFrameClass),
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(GtkClassInitFunc) gtk_aspect_frame_class_init,
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(GtkObjectInitFunc) gtk_aspect_frame_init,
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/* reserved_1 */ NULL,
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/* reserved_2 */ NULL,
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(GtkClassInitFunc) NULL,
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};
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aspect_frame_type = gtk_type_unique (GTK_TYPE_FRAME, &aspect_frame_info);
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}
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return aspect_frame_type;
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}
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static void
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gtk_aspect_frame_class_init (GtkAspectFrameClass *class)
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{
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GtkObjectClass *object_class;
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GtkFrameClass *frame_class;
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parent_class = gtk_type_class (GTK_TYPE_FRAME);
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object_class = GTK_OBJECT_CLASS (class);
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frame_class = GTK_FRAME_CLASS (class);
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object_class->set_arg = gtk_aspect_frame_set_arg;
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object_class->get_arg = gtk_aspect_frame_get_arg;
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frame_class->compute_child_allocation = gtk_aspect_frame_compute_child_allocation;
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gtk_object_add_arg_type ("GtkAspectFrame::xalign", GTK_TYPE_FLOAT,
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GTK_ARG_READWRITE, ARG_XALIGN);
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gtk_object_add_arg_type ("GtkAspectFrame::yalign", GTK_TYPE_FLOAT,
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GTK_ARG_READWRITE, ARG_YALIGN);
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gtk_object_add_arg_type ("GtkAspectFrame::ratio", GTK_TYPE_FLOAT,
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GTK_ARG_READWRITE, ARG_RATIO);
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gtk_object_add_arg_type ("GtkAspectFrame::obey_child", GTK_TYPE_BOOL,
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GTK_ARG_READWRITE, ARG_OBEY_CHILD);
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}
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static void
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gtk_aspect_frame_init (GtkAspectFrame *aspect_frame)
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{
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aspect_frame->xalign = 0.5;
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aspect_frame->yalign = 0.5;
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aspect_frame->ratio = 1.0;
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aspect_frame->obey_child = TRUE;
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}
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static void
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gtk_aspect_frame_set_arg (GtkObject *object,
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GtkArg *arg,
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guint arg_id)
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{
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GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
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switch (arg_id)
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{
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case ARG_XALIGN:
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gtk_aspect_frame_set (aspect_frame,
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GTK_VALUE_FLOAT (*arg),
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aspect_frame->yalign,
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aspect_frame->ratio,
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aspect_frame->obey_child);
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break;
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case ARG_YALIGN:
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gtk_aspect_frame_set (aspect_frame,
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aspect_frame->xalign,
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GTK_VALUE_FLOAT (*arg),
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aspect_frame->ratio,
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aspect_frame->obey_child);
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break;
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case ARG_RATIO:
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gtk_aspect_frame_set (aspect_frame,
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aspect_frame->xalign,
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aspect_frame->yalign,
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GTK_VALUE_FLOAT (*arg),
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aspect_frame->obey_child);
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break;
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case ARG_OBEY_CHILD:
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gtk_aspect_frame_set (aspect_frame,
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aspect_frame->xalign,
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aspect_frame->yalign,
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aspect_frame->ratio,
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GTK_VALUE_BOOL (*arg));
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break;
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}
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}
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static void
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gtk_aspect_frame_get_arg (GtkObject *object,
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GtkArg *arg,
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guint arg_id)
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{
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GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
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switch (arg_id)
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{
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case ARG_XALIGN:
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GTK_VALUE_FLOAT (*arg) = aspect_frame->xalign;
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break;
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case ARG_YALIGN:
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GTK_VALUE_FLOAT (*arg) = aspect_frame->yalign;
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break;
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case ARG_RATIO:
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GTK_VALUE_FLOAT (*arg) = aspect_frame->ratio;
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break;
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case ARG_OBEY_CHILD:
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GTK_VALUE_BOOL (*arg) = aspect_frame->obey_child;
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break;
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default:
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arg->type = GTK_TYPE_INVALID;
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break;
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}
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}
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GtkWidget*
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gtk_aspect_frame_new (const gchar *label,
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gfloat xalign,
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gfloat yalign,
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gfloat ratio,
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gboolean obey_child)
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{
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GtkAspectFrame *aspect_frame;
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aspect_frame = gtk_type_new (gtk_aspect_frame_get_type ());
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aspect_frame->xalign = CLAMP (xalign, 0.0, 1.0);
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aspect_frame->yalign = CLAMP (yalign, 0.0, 1.0);
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aspect_frame->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
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aspect_frame->obey_child = obey_child != FALSE;
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gtk_frame_set_label (GTK_FRAME(aspect_frame), label);
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return GTK_WIDGET (aspect_frame);
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}
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void
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gtk_aspect_frame_set (GtkAspectFrame *aspect_frame,
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gfloat xalign,
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gfloat yalign,
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gfloat ratio,
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gboolean obey_child)
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{
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g_return_if_fail (aspect_frame != NULL);
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g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame));
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xalign = CLAMP (xalign, 0.0, 1.0);
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yalign = CLAMP (yalign, 0.0, 1.0);
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ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
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obey_child = obey_child != FALSE;
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if ((aspect_frame->xalign != xalign) ||
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(aspect_frame->yalign != yalign) ||
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(aspect_frame->ratio != ratio) ||
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(aspect_frame->obey_child != obey_child))
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{
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GtkWidget *widget = GTK_WIDGET(aspect_frame);
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aspect_frame->xalign = xalign;
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aspect_frame->yalign = yalign;
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aspect_frame->ratio = ratio;
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aspect_frame->obey_child = obey_child;
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gtk_widget_queue_resize (widget);
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}
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}
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static void
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gtk_aspect_frame_compute_child_allocation (GtkFrame *frame,
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GtkAllocation *child_allocation)
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{
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GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (frame);
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GtkBin *bin = GTK_BIN (frame);
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gdouble ratio;
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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{
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GtkAllocation full_allocation;
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if (aspect_frame->obey_child)
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{
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GtkRequisition child_requisition;
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gtk_widget_get_child_requisition (bin->child, &child_requisition);
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if (child_requisition.height != 0)
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{
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ratio = ((gdouble) child_requisition.width /
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child_requisition.height);
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if (ratio < MIN_RATIO)
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ratio = MIN_RATIO;
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}
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else if (child_requisition.width != 0)
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ratio = MAX_RATIO;
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else
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ratio = 1.0;
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}
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else
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ratio = aspect_frame->ratio;
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parent_class->compute_child_allocation (frame, &full_allocation);
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if (ratio * full_allocation.height > full_allocation.width)
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{
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child_allocation->width = full_allocation.width;
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child_allocation->height = full_allocation.width / ratio + 0.5;
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}
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else
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{
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child_allocation->width = ratio * full_allocation.height + 0.5;
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child_allocation->height = full_allocation.height;
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}
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child_allocation->x = full_allocation.x + aspect_frame->xalign * (full_allocation.width - child_allocation->width);
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child_allocation->y = full_allocation.y + aspect_frame->yalign * (full_allocation.height - child_allocation->height);
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}
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else
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parent_class->compute_child_allocation (frame, child_allocation);
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}
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