361 lines
12 KiB
C
361 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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* 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, 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 "gtkalignment.h"
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#include "gtkintl.h"
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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_XSCALE,
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PROP_YSCALE,
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PROP_LAST
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};
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static void gtk_alignment_class_init (GtkAlignmentClass *klass);
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static void gtk_alignment_init (GtkAlignment *alignment);
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static void gtk_alignment_size_request (GtkWidget *widget,
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GtkRequisition *requisition);
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static void gtk_alignment_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static void gtk_alignment_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_alignment_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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GtkType
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gtk_alignment_get_type (void)
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{
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static GtkType alignment_type = 0;
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if (!alignment_type)
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{
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static const GtkTypeInfo alignment_info =
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{
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"GtkAlignment",
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sizeof (GtkAlignment),
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sizeof (GtkAlignmentClass),
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(GtkClassInitFunc) gtk_alignment_class_init,
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(GtkObjectInitFunc) gtk_alignment_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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alignment_type = gtk_type_unique (GTK_TYPE_BIN, &alignment_info);
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}
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return alignment_type;
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}
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static void
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gtk_alignment_class_init (GtkAlignmentClass *class)
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{
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GObjectClass *gobject_class;
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GtkObjectClass *object_class;
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GtkWidgetClass *widget_class;
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gobject_class = (GObjectClass*) class;
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object_class = (GtkObjectClass*) class;
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widget_class = (GtkWidgetClass*) class;
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gobject_class->set_property = gtk_alignment_set_property;
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gobject_class->get_property = gtk_alignment_get_property;
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widget_class->size_request = gtk_alignment_size_request;
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widget_class->size_allocate = gtk_alignment_size_allocate;
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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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_("Horizontal alignment"),
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_("Horizontal position of child in available space. 0.0 is left aligned, 1.0 is right aligned"),
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0.0,
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1.0,
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0.5,
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G_PARAM_READABLE | G_PARAM_WRITABLE));
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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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_("Vertical alignment"),
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_("Vertical position of child in available space. 0.0 is top aligned, 1.0 is bottom aligned"),
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0.0,
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1.0,
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0.5,
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G_PARAM_READABLE | G_PARAM_WRITABLE));
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g_object_class_install_property (gobject_class,
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PROP_XSCALE,
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g_param_spec_float("xscale",
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_("Horizontal scale"),
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_("If available horizontal space is bigger than needed for the child, how much of it to use for the child. 0.0 means none, 1.0 means all"),
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0.0,
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1.0,
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1.0,
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G_PARAM_READABLE | G_PARAM_WRITABLE));
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g_object_class_install_property (gobject_class,
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PROP_YSCALE,
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g_param_spec_float("yscale",
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_("Vertical scale"),
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_("If available vertical space is bigger than needed for the child, how much of it to use for the child. 0.0 means none, 1.0 means all"),
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0.0,
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1.0,
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1.0,
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G_PARAM_READABLE | G_PARAM_WRITABLE));
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}
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static void
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gtk_alignment_init (GtkAlignment *alignment)
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{
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GTK_WIDGET_SET_FLAGS (alignment, GTK_NO_WINDOW);
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gtk_widget_set_redraw_on_allocate (GTK_WIDGET (alignment), FALSE);
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alignment->xalign = 0.5;
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alignment->yalign = 0.5;
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alignment->xscale = 1.0;
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alignment->yscale = 1.0;
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}
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GtkWidget*
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gtk_alignment_new (gfloat xalign,
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gfloat yalign,
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gfloat xscale,
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gfloat yscale)
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{
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GtkAlignment *alignment;
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alignment = gtk_type_new (gtk_alignment_get_type ());
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alignment->xalign = CLAMP (xalign, 0.0, 1.0);
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alignment->yalign = CLAMP (yalign, 0.0, 1.0);
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alignment->xscale = CLAMP (xscale, 0.0, 1.0);
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alignment->yscale = CLAMP (yscale, 0.0, 1.0);
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return GTK_WIDGET (alignment);
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}
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static void
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gtk_alignment_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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GtkAlignment *alignment;
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alignment = GTK_ALIGNMENT (object);
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switch (prop_id)
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{
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case PROP_XALIGN:
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gtk_alignment_set (alignment,
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g_value_get_float (value),
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alignment->yalign,
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alignment->xscale,
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alignment->yscale);
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break;
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case PROP_YALIGN:
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gtk_alignment_set (alignment,
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alignment->xalign,
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g_value_get_float (value),
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alignment->xscale,
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alignment->yscale);
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break;
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case PROP_XSCALE:
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gtk_alignment_set (alignment,
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alignment->xalign,
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alignment->yalign,
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g_value_get_float (value),
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alignment->yscale);
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break;
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case PROP_YSCALE:
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gtk_alignment_set (alignment,
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alignment->xalign,
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alignment->yalign,
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alignment->xscale,
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g_value_get_float (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_alignment_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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GtkAlignment *alignment;
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alignment = GTK_ALIGNMENT (object);
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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, alignment->xalign);
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break;
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case PROP_YALIGN:
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g_value_set_float(value, alignment->yalign);
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break;
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case PROP_XSCALE:
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g_value_set_float(value, alignment->xscale);
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break;
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case PROP_YSCALE:
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g_value_set_float(value, alignment->yscale);
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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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void
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gtk_alignment_set (GtkAlignment *alignment,
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gfloat xalign,
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gfloat yalign,
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gfloat xscale,
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gfloat yscale)
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{
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g_return_if_fail (GTK_IS_ALIGNMENT (alignment));
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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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xscale = CLAMP (xscale, 0.0, 1.0);
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yscale = CLAMP (yscale, 0.0, 1.0);
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if ( (alignment->xalign != xalign)
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|| (alignment->yalign != yalign)
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|| (alignment->xscale != xscale)
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|| (alignment->yscale != yscale))
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{
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g_object_freeze_notify (G_OBJECT (alignment));
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if (alignment->xalign != xalign)
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{
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alignment->xalign = xalign;
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g_object_notify (G_OBJECT (alignment), "xalign");
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}
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if (alignment->yalign != yalign)
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{
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alignment->yalign = yalign;
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g_object_notify (G_OBJECT (alignment), "yalign");
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}
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if (alignment->xscale != xscale)
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{
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alignment->xscale = xscale;
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g_object_notify (G_OBJECT (alignment), "xscale");
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}
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if (alignment->yscale != yscale)
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{
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alignment->yscale = yscale;
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g_object_notify (G_OBJECT (alignment), "yscale");
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}
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g_object_thaw_notify (G_OBJECT (alignment));
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if (GTK_BIN (alignment)->child)
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gtk_widget_queue_resize (GTK_BIN (alignment)->child);
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gtk_widget_queue_draw (GTK_WIDGET (alignment));
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}
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}
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static void
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gtk_alignment_size_request (GtkWidget *widget,
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GtkRequisition *requisition)
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{
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GtkAlignment *alignment;
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GtkBin *bin;
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alignment = GTK_ALIGNMENT (widget);
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bin = GTK_BIN (widget);
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requisition->width = GTK_CONTAINER (widget)->border_width * 2;
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requisition->height = GTK_CONTAINER (widget)->border_width * 2;
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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{
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GtkRequisition child_requisition;
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gtk_widget_size_request (bin->child, &child_requisition);
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requisition->width += child_requisition.width;
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requisition->height += child_requisition.height;
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}
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}
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static void
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gtk_alignment_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkAlignment *alignment;
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GtkBin *bin;
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GtkAllocation child_allocation;
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GtkRequisition child_requisition;
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gint width, height;
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gint x, y;
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widget->allocation = *allocation;
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alignment = GTK_ALIGNMENT (widget);
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bin = GTK_BIN (widget);
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if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
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{
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gtk_widget_get_child_requisition (bin->child, &child_requisition);
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x = GTK_CONTAINER (alignment)->border_width;
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y = GTK_CONTAINER (alignment)->border_width;
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width = MAX (allocation->width - 2 * x, 0);
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height = MAX (allocation->height - 2 * y, 0);
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if (width > child_requisition.width)
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child_allocation.width = (child_requisition.width *
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(1.0 - alignment->xscale) +
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width * alignment->xscale);
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else
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child_allocation.width = width;
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if (height > child_requisition.height)
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child_allocation.height = (child_requisition.height *
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(1.0 - alignment->yscale) +
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height * alignment->yscale);
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else
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child_allocation.height = height;
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child_allocation.x = alignment->xalign * (width - child_allocation.width) + allocation->x + x;
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child_allocation.y = alignment->yalign * (height - child_allocation.height) + allocation->y + y;
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gtk_widget_size_allocate (bin->child, &child_allocation);
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}
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}
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