forked from AuroraMiddleware/gtk
729 lines
24 KiB
C
729 lines
24 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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/**
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* SECTION:gtkalignment
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* @Short_description: A widget which controls the alignment and size of its child
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* @Title: GtkAlignment
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*
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* The #GtkAlignment widget controls the alignment and size of its child widget.
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* It has four settings: xscale, yscale, xalign, and yalign.
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*
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* The scale settings are used to specify how much the child widget should
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* expand to fill the space allocated to the #GtkAlignment.
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* The values can range from 0 (meaning the child doesn't expand at all) to
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* 1 (meaning the child expands to fill all of the available space).
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*
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* The align settings are used to place the child widget within the available
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* area. The values range from 0 (top or left) to 1 (bottom or right).
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* Of course, if the scale settings are both set to 1, the alignment settings
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* have no effect.
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*/
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#include "config.h"
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#include "gtkalignment.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 _GtkAlignmentPriv
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{
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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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guint padding_bottom;
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guint padding_top;
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guint padding_left;
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guint padding_right;
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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_XSCALE,
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PROP_YSCALE,
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PROP_TOP_PADDING,
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PROP_BOTTOM_PADDING,
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PROP_LEFT_PADDING,
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PROP_RIGHT_PADDING
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};
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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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static void gtk_alignment_size_request_init (GtkSizeRequestIface *iface);
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static void gtk_alignment_get_width (GtkSizeRequest *widget,
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gint *minimum_size,
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gint *natural_size);
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static void gtk_alignment_get_height (GtkSizeRequest *widget,
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gint *minimum_size,
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gint *natural_size);
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G_DEFINE_TYPE_WITH_CODE (GtkAlignment, gtk_alignment, GTK_TYPE_BIN,
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G_IMPLEMENT_INTERFACE (GTK_TYPE_SIZE_REQUEST,
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gtk_alignment_size_request_init))
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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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GtkWidgetClass *widget_class;
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gobject_class = (GObjectClass*) 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_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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P_("Horizontal alignment"),
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P_("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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GTK_PARAM_READWRITE));
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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_("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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GTK_PARAM_READWRITE));
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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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P_("Horizontal scale"),
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P_("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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GTK_PARAM_READWRITE));
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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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P_("Vertical scale"),
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P_("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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GTK_PARAM_READWRITE));
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/**
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* GtkAlignment:top-padding:
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*
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* The padding to insert at the top of the widget.
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*
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* Since: 2.4
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*/
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g_object_class_install_property (gobject_class,
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PROP_TOP_PADDING,
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g_param_spec_uint("top-padding",
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P_("Top Padding"),
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P_("The padding to insert at the top of the widget."),
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0,
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G_MAXINT,
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0,
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GTK_PARAM_READWRITE));
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/**
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* GtkAlignment:bottom-padding:
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*
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* The padding to insert at the bottom of the widget.
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*
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* Since: 2.4
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*/
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g_object_class_install_property (gobject_class,
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PROP_BOTTOM_PADDING,
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g_param_spec_uint("bottom-padding",
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P_("Bottom Padding"),
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P_("The padding to insert at the bottom of the widget."),
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0,
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G_MAXINT,
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0,
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GTK_PARAM_READWRITE));
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/**
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* GtkAlignment:left-padding:
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*
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* The padding to insert at the left of the widget.
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*
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* Since: 2.4
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*/
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g_object_class_install_property (gobject_class,
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PROP_LEFT_PADDING,
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g_param_spec_uint("left-padding",
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P_("Left Padding"),
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P_("The padding to insert at the left of the widget."),
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0,
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G_MAXINT,
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0,
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GTK_PARAM_READWRITE));
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/**
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* GtkAlignment:right-padding:
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*
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* The padding to insert at the right of the widget.
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*
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* Since: 2.4
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*/
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g_object_class_install_property (gobject_class,
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PROP_RIGHT_PADDING,
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g_param_spec_uint("right-padding",
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P_("Right Padding"),
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P_("The padding to insert at the right of the widget."),
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0,
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G_MAXINT,
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0,
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GTK_PARAM_READWRITE));
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g_type_class_add_private (gobject_class, sizeof (GtkAlignmentPriv));
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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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GtkAlignmentPriv *priv;
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alignment->priv = G_TYPE_INSTANCE_GET_PRIVATE (alignment,
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GTK_TYPE_ALIGNMENT,
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GtkAlignmentPriv);
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priv = alignment->priv;
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gtk_widget_set_has_window (GTK_WIDGET (alignment), FALSE);
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gtk_widget_set_redraw_on_allocate (GTK_WIDGET (alignment), FALSE);
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priv->xalign = 0.5;
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priv->yalign = 0.5;
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priv->xscale = 1.0;
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priv->yscale = 1.0;
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/* Initialize padding with default values: */
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priv->padding_top = 0;
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priv->padding_bottom = 0;
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priv->padding_left = 0;
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priv->padding_right = 0;
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}
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/**
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* gtk_alignment_new:
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* @xalign: the horizontal alignment of the child widget, from 0 (left) to 1
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* (right).
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* @yalign: the vertical alignment of the child widget, from 0 (top) to 1
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* (bottom).
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* @xscale: the amount that the child widget expands horizontally to fill up
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* unused space, from 0 to 1.
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* A value of 0 indicates that the child widget should never expand.
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* A value of 1 indicates that the child widget will expand to fill all of the
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* space allocated for the #GtkAlignment.
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* @yscale: the amount that the child widget expands vertically to fill up
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* unused space, from 0 to 1. The values are similar to @xscale.
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*
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* Creates a new #GtkAlignment.
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*
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* Returns: the new #GtkAlignment.
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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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GtkAlignmentPriv *priv;
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alignment = g_object_new (GTK_TYPE_ALIGNMENT, NULL);
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priv = alignment->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->xscale = CLAMP (xscale, 0.0, 1.0);
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priv->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 = GTK_ALIGNMENT (object);
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GtkAlignmentPriv *priv = alignment->priv;
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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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priv->yalign,
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priv->xscale,
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priv->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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priv->xalign,
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g_value_get_float (value),
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priv->xscale,
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priv->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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priv->xalign,
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priv->yalign,
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g_value_get_float (value),
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priv->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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priv->xalign,
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priv->yalign,
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priv->xscale,
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g_value_get_float (value));
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break;
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/* Padding: */
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case PROP_TOP_PADDING:
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gtk_alignment_set_padding (alignment,
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g_value_get_uint (value),
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priv->padding_bottom,
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priv->padding_left,
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priv->padding_right);
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break;
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case PROP_BOTTOM_PADDING:
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gtk_alignment_set_padding (alignment,
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priv->padding_top,
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g_value_get_uint (value),
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priv->padding_left,
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priv->padding_right);
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break;
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case PROP_LEFT_PADDING:
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gtk_alignment_set_padding (alignment,
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priv->padding_top,
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priv->padding_bottom,
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g_value_get_uint (value),
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priv->padding_right);
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break;
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case PROP_RIGHT_PADDING:
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gtk_alignment_set_padding (alignment,
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priv->padding_top,
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priv->padding_bottom,
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priv->padding_left,
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g_value_get_uint (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 = GTK_ALIGNMENT (object);
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GtkAlignmentPriv *priv = alignment->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_XSCALE:
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g_value_set_float(value, priv->xscale);
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break;
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case PROP_YSCALE:
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g_value_set_float(value, priv->yscale);
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break;
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/* Padding: */
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case PROP_TOP_PADDING:
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g_value_set_uint (value, priv->padding_top);
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break;
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case PROP_BOTTOM_PADDING:
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g_value_set_uint (value, priv->padding_bottom);
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break;
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case PROP_LEFT_PADDING:
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g_value_set_uint (value, priv->padding_left);
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break;
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case PROP_RIGHT_PADDING:
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g_value_set_uint (value, priv->padding_right);
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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_alignment_set:
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* @alignment: a #GtkAlignment.
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* @xalign: the horizontal alignment of the child widget, from 0 (left) to 1
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* (right).
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* @yalign: the vertical alignment of the child widget, from 0 (top) to 1
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* (bottom).
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* @xscale: the amount that the child widget expands horizontally to fill up
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* unused space, from 0 to 1.
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* A value of 0 indicates that the child widget should never expand.
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* A value of 1 indicates that the child widget will expand to fill all of the
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* space allocated for the #GtkAlignment.
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* @yscale: the amount that the child widget expands vertically to fill up
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* unused space, from 0 to 1. The values are similar to @xscale.
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*
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* Sets the #GtkAlignment values.
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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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GtkAlignmentPriv *priv;
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GtkWidget *child;
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g_return_if_fail (GTK_IS_ALIGNMENT (alignment));
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priv = alignment->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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xscale = CLAMP (xscale, 0.0, 1.0);
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yscale = CLAMP (yscale, 0.0, 1.0);
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if ( (priv->xalign != xalign)
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|| (priv->yalign != yalign)
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|| (priv->xscale != xscale)
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|| (priv->yscale != yscale))
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{
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g_object_freeze_notify (G_OBJECT (alignment));
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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 (alignment), "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 (alignment), "yalign");
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}
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if (priv->xscale != xscale)
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{
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priv->xscale = xscale;
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g_object_notify (G_OBJECT (alignment), "xscale");
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}
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if (priv->yscale != yscale)
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{
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priv->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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child = gtk_bin_get_child (GTK_BIN (alignment));
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if (child)
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gtk_widget_queue_resize (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_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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GtkAlignment *alignment = GTK_ALIGNMENT (widget);
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GtkAlignmentPriv *priv = alignment->priv;
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GtkBin *bin;
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GtkAllocation child_allocation;
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GtkWidget *bin_child;
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gint width, height;
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guint border_width;
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gint padding_horizontal, padding_vertical;
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padding_horizontal = 0;
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padding_vertical = 0;
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gtk_widget_set_allocation (widget, allocation);
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bin = GTK_BIN (widget);
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bin_child = gtk_bin_get_child (bin);
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if (bin_child && gtk_widget_get_visible (bin_child))
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{
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GtkSizeRequest *child = GTK_SIZE_REQUEST (bin_child);
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gint child_nat_width;
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gint child_nat_height;
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gint child_width, child_height;
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border_width = gtk_container_get_border_width (GTK_CONTAINER (alignment));
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padding_horizontal = priv->padding_left + priv->padding_right;
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padding_vertical = priv->padding_top + priv->padding_bottom;
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width = MAX (1, allocation->width - padding_horizontal - 2 * border_width);
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height = MAX (1, allocation->height - padding_vertical - 2 * border_width);
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if (gtk_size_request_get_request_mode (child) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
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{
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gtk_size_request_get_width (child, NULL, &child_nat_width);
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child_width = MIN (width, child_nat_width);
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gtk_size_request_get_height_for_width (child, child_width, NULL, &child_nat_height);
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child_height = MIN (height, child_nat_height);
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}
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else
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{
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gtk_size_request_get_height (child, NULL, &child_nat_height);
|
|
|
|
child_height = MIN (height, child_nat_height);
|
|
|
|
gtk_size_request_get_width_for_height (child, child_height, NULL, &child_nat_width);
|
|
|
|
child_width = MIN (width, child_nat_width);
|
|
}
|
|
|
|
if (width > child_width)
|
|
child_allocation.width = (child_width *
|
|
(1.0 - priv->xscale) +
|
|
width * priv->xscale);
|
|
else
|
|
child_allocation.width = width;
|
|
|
|
if (height > child_height)
|
|
child_allocation.height = (child_height *
|
|
(1.0 - priv->yscale) +
|
|
height * priv->yscale);
|
|
else
|
|
child_allocation.height = height;
|
|
|
|
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
|
|
child_allocation.x = (1.0 - priv->xalign) * (width - child_allocation.width) + allocation->x + border_width + priv->padding_right;
|
|
else
|
|
child_allocation.x = priv->xalign * (width - child_allocation.width) + allocation->x + border_width + priv->padding_left;
|
|
|
|
child_allocation.y = priv->yalign * (height - child_allocation.height) + allocation->y + border_width + priv->padding_top;
|
|
|
|
gtk_widget_size_allocate (bin_child, &child_allocation);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
gtk_alignment_size_request_init (GtkSizeRequestIface *iface)
|
|
{
|
|
iface->get_width = gtk_alignment_get_width;
|
|
iface->get_height = gtk_alignment_get_height;
|
|
}
|
|
|
|
static void
|
|
gtk_alignment_get_size (GtkSizeRequest *widget,
|
|
GtkOrientation orientation,
|
|
gint *minimum_size,
|
|
gint *natural_size)
|
|
{
|
|
GtkAlignment *alignment = GTK_ALIGNMENT (widget);
|
|
GtkAlignmentPriv *priv = alignment->priv;
|
|
GtkWidget *child;
|
|
guint minimum, natural;
|
|
|
|
natural = minimum = gtk_container_get_border_width (GTK_CONTAINER (widget)) * 2;
|
|
|
|
if ((child = gtk_bin_get_child (GTK_BIN (widget))) && gtk_widget_get_visible (child))
|
|
{
|
|
gint child_min, child_nat;
|
|
|
|
/* Request extra space for the padding: */
|
|
if (orientation == GTK_ORIENTATION_HORIZONTAL)
|
|
{
|
|
minimum += (priv->padding_left + priv->padding_right);
|
|
gtk_size_request_get_width (GTK_SIZE_REQUEST (child),
|
|
&child_min, &child_nat);
|
|
}
|
|
else
|
|
{
|
|
minimum += (priv->padding_top + priv->padding_bottom);
|
|
gtk_size_request_get_height (GTK_SIZE_REQUEST (child),
|
|
&child_min, &child_nat);
|
|
}
|
|
|
|
natural = minimum;
|
|
|
|
minimum += child_min;
|
|
natural += child_nat;
|
|
}
|
|
|
|
if (minimum_size)
|
|
*minimum_size = minimum;
|
|
|
|
if (natural_size)
|
|
*natural_size = natural;
|
|
}
|
|
|
|
static void
|
|
gtk_alignment_get_width (GtkSizeRequest *widget,
|
|
gint *minimum_size,
|
|
gint *natural_size)
|
|
{
|
|
gtk_alignment_get_size (widget, GTK_ORIENTATION_HORIZONTAL, minimum_size, natural_size);
|
|
}
|
|
|
|
static void
|
|
gtk_alignment_get_height (GtkSizeRequest *widget,
|
|
gint *minimum_size,
|
|
gint *natural_size)
|
|
{
|
|
gtk_alignment_get_size (widget, GTK_ORIENTATION_VERTICAL, minimum_size, natural_size);
|
|
}
|
|
|
|
/**
|
|
* gtk_alignment_set_padding:
|
|
* @alignment: a #GtkAlignment
|
|
* @padding_top: the padding at the top of the widget
|
|
* @padding_bottom: the padding at the bottom of the widget
|
|
* @padding_left: the padding at the left of the widget
|
|
* @padding_right: the padding at the right of the widget.
|
|
*
|
|
* Sets the padding on the different sides of the widget.
|
|
* The padding adds blank space to the sides of the widget. For instance,
|
|
* this can be used to indent the child widget towards the right by adding
|
|
* padding on the left.
|
|
*
|
|
* Since: 2.4
|
|
*/
|
|
void
|
|
gtk_alignment_set_padding (GtkAlignment *alignment,
|
|
guint padding_top,
|
|
guint padding_bottom,
|
|
guint padding_left,
|
|
guint padding_right)
|
|
{
|
|
GtkAlignmentPriv *priv;
|
|
GtkWidget *child;
|
|
|
|
g_return_if_fail (GTK_IS_ALIGNMENT (alignment));
|
|
|
|
priv = alignment->priv;
|
|
|
|
g_object_freeze_notify (G_OBJECT (alignment));
|
|
|
|
if (priv->padding_top != padding_top)
|
|
{
|
|
priv->padding_top = padding_top;
|
|
g_object_notify (G_OBJECT (alignment), "top-padding");
|
|
}
|
|
if (priv->padding_bottom != padding_bottom)
|
|
{
|
|
priv->padding_bottom = padding_bottom;
|
|
g_object_notify (G_OBJECT (alignment), "bottom-padding");
|
|
}
|
|
if (priv->padding_left != padding_left)
|
|
{
|
|
priv->padding_left = padding_left;
|
|
g_object_notify (G_OBJECT (alignment), "left-padding");
|
|
}
|
|
if (priv->padding_right != padding_right)
|
|
{
|
|
priv->padding_right = padding_right;
|
|
g_object_notify (G_OBJECT (alignment), "right-padding");
|
|
}
|
|
|
|
g_object_thaw_notify (G_OBJECT (alignment));
|
|
|
|
/* Make sure that the widget and children are redrawn with the new setting: */
|
|
child = gtk_bin_get_child (GTK_BIN (alignment));
|
|
if (child)
|
|
gtk_widget_queue_resize (child);
|
|
|
|
gtk_widget_queue_draw (GTK_WIDGET (alignment));
|
|
}
|
|
|
|
/**
|
|
* gtk_alignment_get_padding:
|
|
* @alignment: a #GtkAlignment
|
|
* @padding_top: (allow-none): location to store the padding for the top of the widget, or %NULL
|
|
* @padding_bottom: (allow-none): location to store the padding for the bottom of the widget, or %NULL
|
|
* @padding_left: (allow-none): location to store the padding for the left of the widget, or %NULL
|
|
* @padding_right: (allow-none): location to store the padding for the right of the widget, or %NULL
|
|
*
|
|
* Gets the padding on the different sides of the widget.
|
|
* See gtk_alignment_set_padding ().
|
|
*
|
|
* Since: 2.4
|
|
*/
|
|
void
|
|
gtk_alignment_get_padding (GtkAlignment *alignment,
|
|
guint *padding_top,
|
|
guint *padding_bottom,
|
|
guint *padding_left,
|
|
guint *padding_right)
|
|
{
|
|
GtkAlignmentPriv *priv;
|
|
|
|
g_return_if_fail (GTK_IS_ALIGNMENT (alignment));
|
|
|
|
priv = alignment->priv;
|
|
|
|
if(padding_top)
|
|
*padding_top = priv->padding_top;
|
|
if(padding_bottom)
|
|
*padding_bottom = priv->padding_bottom;
|
|
if(padding_left)
|
|
*padding_left = priv->padding_left;
|
|
if(padding_right)
|
|
*padding_right = priv->padding_right;
|
|
}
|