381 lines
12 KiB
C
381 lines
12 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 Lesser 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2001. 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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/**
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* SECTION:gtkaspectframe
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* @Short_description: A frame that constrains its child to a particular aspect ratio
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* @Title: GtkAspectFrame
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*
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* The #GtkAspectFrame is useful when you want
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* pack a widget so that it can resize but always retains
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* the same aspect ratio. For instance, one might be
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* drawing a small preview of a larger image. #GtkAspectFrame
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* derives from #GtkFrame, so it can draw a label and
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* a frame around the child. The frame will be
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* “shrink-wrapped” to the size of the child.
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*/
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#include "config.h"
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#include "gtkaspectframe.h"
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#include "gtksizerequest.h"
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#include "gtkprivate.h"
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#include "gtkintl.h"
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struct _GtkAspectFramePrivate
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{
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GtkAllocation center_allocation;
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gboolean obey_child;
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gfloat xalign;
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gfloat yalign;
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gfloat ratio;
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};
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enum {
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PROP_0,
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PROP_XALIGN,
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PROP_YALIGN,
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PROP_RATIO,
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PROP_OBEY_CHILD
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};
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static void gtk_aspect_frame_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void gtk_aspect_frame_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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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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G_DEFINE_TYPE_WITH_PRIVATE (GtkAspectFrame, gtk_aspect_frame, GTK_TYPE_FRAME)
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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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GObjectClass *gobject_class;
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GtkFrameClass *frame_class;
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gobject_class = (GObjectClass*) class;
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frame_class = (GtkFrameClass*) class;
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gobject_class->set_property = gtk_aspect_frame_set_property;
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gobject_class->get_property = gtk_aspect_frame_get_property;
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frame_class->compute_child_allocation = gtk_aspect_frame_compute_child_allocation;
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g_object_class_install_property (gobject_class,
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PROP_XALIGN,
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g_param_spec_float ("xalign",
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P_("Horizontal Alignment"),
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P_("X alignment of the child"),
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0.0, 1.0, 0.5,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
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g_object_class_install_property (gobject_class,
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PROP_YALIGN,
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g_param_spec_float ("yalign",
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P_("Vertical Alignment"),
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P_("Y alignment of the child"),
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0.0, 1.0, 0.5,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
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g_object_class_install_property (gobject_class,
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PROP_RATIO,
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g_param_spec_float ("ratio",
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P_("Ratio"),
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P_("Aspect ratio if obey_child is FALSE"),
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MIN_RATIO, MAX_RATIO, 1.0,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
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g_object_class_install_property (gobject_class,
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PROP_OBEY_CHILD,
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g_param_spec_boolean ("obey-child",
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P_("Obey child"),
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P_("Force aspect ratio to match that of the frame's child"),
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TRUE,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
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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->priv = gtk_aspect_frame_get_instance_private (aspect_frame);
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aspect_frame->priv->xalign = 0.5;
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aspect_frame->priv->yalign = 0.5;
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aspect_frame->priv->ratio = 1.0;
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aspect_frame->priv->obey_child = TRUE;
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}
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static void
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gtk_aspect_frame_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
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GtkAspectFramePrivate *priv = aspect_frame->priv;
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switch (prop_id)
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{
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/* g_object_notify is handled by the _frame_set function */
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case PROP_XALIGN:
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gtk_aspect_frame_set (aspect_frame,
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g_value_get_float (value),
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priv->yalign,
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priv->ratio,
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priv->obey_child);
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break;
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case PROP_YALIGN:
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gtk_aspect_frame_set (aspect_frame,
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priv->xalign,
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g_value_get_float (value),
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priv->ratio,
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priv->obey_child);
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break;
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case PROP_RATIO:
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gtk_aspect_frame_set (aspect_frame,
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priv->xalign,
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priv->yalign,
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g_value_get_float (value),
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priv->obey_child);
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break;
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case PROP_OBEY_CHILD:
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gtk_aspect_frame_set (aspect_frame,
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priv->xalign,
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priv->yalign,
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priv->ratio,
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g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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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_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkAspectFrame *aspect_frame = GTK_ASPECT_FRAME (object);
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GtkAspectFramePrivate *priv = aspect_frame->priv;
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switch (prop_id)
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{
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case PROP_XALIGN:
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g_value_set_float (value, priv->xalign);
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break;
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case PROP_YALIGN:
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g_value_set_float (value, priv->yalign);
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break;
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case PROP_RATIO:
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g_value_set_float (value, priv->ratio);
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break;
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case PROP_OBEY_CHILD:
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g_value_set_boolean (value, priv->obey_child);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/**
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* gtk_aspect_frame_new:
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* @label: (allow-none): Label text.
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* @xalign: Horizontal alignment of the child within the allocation of
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* the #GtkAspectFrame. This ranges from 0.0 (left aligned)
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* to 1.0 (right aligned)
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* @yalign: Vertical alignment of the child within the allocation of
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* the #GtkAspectFrame. This ranges from 0.0 (top aligned)
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* to 1.0 (bottom aligned)
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* @ratio: The desired aspect ratio.
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* @obey_child: If %TRUE, @ratio is ignored, and the aspect
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* ratio is taken from the requistion of the child.
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*
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* Create a new #GtkAspectFrame.
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*
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* Returns: the new #GtkAspectFrame.
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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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GtkAspectFramePrivate *priv;
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aspect_frame = g_object_new (GTK_TYPE_ASPECT_FRAME, NULL);
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priv = aspect_frame->priv;
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priv->xalign = CLAMP (xalign, 0.0, 1.0);
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priv->yalign = CLAMP (yalign, 0.0, 1.0);
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priv->ratio = CLAMP (ratio, MIN_RATIO, MAX_RATIO);
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priv->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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/**
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* gtk_aspect_frame_set:
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* @aspect_frame: a #GtkAspectFrame
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* @xalign: Horizontal alignment of the child within the allocation of
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* the #GtkAspectFrame. This ranges from 0.0 (left aligned)
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* to 1.0 (right aligned)
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* @yalign: Vertical alignment of the child within the allocation of
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* the #GtkAspectFrame. This ranges from 0.0 (top aligned)
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* to 1.0 (bottom aligned)
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* @ratio: The desired aspect ratio.
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* @obey_child: If %TRUE, @ratio is ignored, and the aspect
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* ratio is taken from the requistion of the child.
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*
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* Set parameters for an existing #GtkAspectFrame.
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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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GtkAspectFramePrivate *priv;
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g_return_if_fail (GTK_IS_ASPECT_FRAME (aspect_frame));
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priv = aspect_frame->priv;
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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 (priv->xalign != xalign
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|| priv->yalign != yalign
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|| priv->ratio != ratio
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|| priv->obey_child != obey_child)
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{
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g_object_freeze_notify (G_OBJECT (aspect_frame));
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if (priv->xalign != xalign)
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{
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priv->xalign = xalign;
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g_object_notify (G_OBJECT (aspect_frame), "xalign");
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}
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if (priv->yalign != yalign)
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{
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priv->yalign = yalign;
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g_object_notify (G_OBJECT (aspect_frame), "yalign");
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}
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if (priv->ratio != ratio)
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{
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priv->ratio = ratio;
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g_object_notify (G_OBJECT (aspect_frame), "ratio");
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}
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if (priv->obey_child != obey_child)
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{
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priv->obey_child = obey_child;
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g_object_notify (G_OBJECT (aspect_frame), "obey-child");
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}
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g_object_thaw_notify (G_OBJECT (aspect_frame));
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gtk_widget_queue_resize (GTK_WIDGET (aspect_frame));
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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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GtkAspectFramePrivate *priv = aspect_frame->priv;
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GtkBin *bin = GTK_BIN (frame);
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GtkWidget *child;
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gdouble ratio;
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child = gtk_bin_get_child (bin);
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if (child && gtk_widget_get_visible (child))
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{
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GtkAllocation full_allocation;
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if (priv->obey_child)
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{
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GtkRequisition child_requisition;
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gtk_widget_get_preferred_size (child, &child_requisition, NULL);
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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 = priv->ratio;
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GTK_FRAME_CLASS (gtk_aspect_frame_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 + priv->xalign * (full_allocation.width - child_allocation->width);
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child_allocation->y = full_allocation.y + priv->yalign * (full_allocation.height - child_allocation->height);
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}
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else
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GTK_FRAME_CLASS (gtk_aspect_frame_parent_class)->compute_child_allocation (frame, child_allocation);
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}
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