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gtk/gtk/gtkmisc.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkcontainer.h"
#include "gtkmisc.h"
#include "gtkintl.h"
#include "gtkprivate.h"
/**
* SECTION:gtkmisc
* @Short_description: Base class for widgets with alignments and padding
* @Title: GtkMisc
*
* The #GtkMisc widget is an abstract widget which is not useful itself, but
* is used to derive subclasses which have alignment and padding attributes.
*
* The horizontal and vertical padding attributes allows extra space to be
* added around the widget.
*
* The horizontal and vertical alignment attributes enable the widget to be
* positioned within its allocated area. Note that if the widget is added to
* a container in such a way that it expands automatically to fill its
* allocated area, the alignment settings will not alter the widgets position.
*
* <note>
* Note that the desired effect can in most cases be achieved by using the
* #GtkWidget:halign, #GtkWidget:valign and #GtkWidget:margin properties
* on the child widget, so GtkMisc should not be used in new code.
* </note>
*/
struct _GtkMiscPrivate
{
gfloat xalign;
gfloat yalign;
guint16 xpad;
guint16 ypad;
};
enum {
PROP_0,
PROP_XALIGN,
PROP_YALIGN,
PROP_XPAD,
PROP_YPAD
};
static void gtk_misc_realize (GtkWidget *widget);
static void gtk_misc_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_misc_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GtkMisc, gtk_misc, GTK_TYPE_WIDGET)
static void
gtk_misc_class_init (GtkMiscClass *class)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
gobject_class = G_OBJECT_CLASS (class);
widget_class = (GtkWidgetClass*) class;
gobject_class->set_property = gtk_misc_set_property;
gobject_class->get_property = gtk_misc_get_property;
widget_class->realize = gtk_misc_realize;
g_object_class_install_property (gobject_class,
PROP_XALIGN,
g_param_spec_float ("xalign",
P_("X align"),
P_("The horizontal alignment, from 0 (left) to 1 (right). Reversed for RTL layouts."),
0.0,
1.0,
0.5,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_YALIGN,
g_param_spec_float ("yalign",
P_("Y align"),
P_("The vertical alignment, from 0 (top) to 1 (bottom)"),
0.0,
1.0,
0.5,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_XPAD,
g_param_spec_int ("xpad",
P_("X pad"),
P_("The amount of space to add on the left and right of the widget, in pixels"),
0,
G_MAXINT,
0,
GTK_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_YPAD,
g_param_spec_int ("ypad",
P_("Y pad"),
P_("The amount of space to add on the top and bottom of the widget, in pixels"),
0,
G_MAXINT,
0,
GTK_PARAM_READWRITE));
}
static void
gtk_misc_init (GtkMisc *misc)
{
GtkMiscPrivate *priv;
misc->priv = gtk_misc_get_instance_private (misc);
priv = misc->priv;
priv->xalign = 0.5;
priv->yalign = 0.5;
priv->xpad = 0;
priv->ypad = 0;
}
static void
gtk_misc_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkMisc *misc = GTK_MISC (object);
GtkMiscPrivate *priv = misc->priv;
switch (prop_id)
{
case PROP_XALIGN:
gtk_misc_set_alignment (misc, g_value_get_float (value), priv->yalign);
break;
case PROP_YALIGN:
gtk_misc_set_alignment (misc, priv->xalign, g_value_get_float (value));
break;
case PROP_XPAD:
gtk_misc_set_padding (misc, g_value_get_int (value), priv->ypad);
break;
case PROP_YPAD:
gtk_misc_set_padding (misc, priv->xpad, g_value_get_int (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_misc_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkMisc *misc = GTK_MISC (object);
GtkMiscPrivate *priv = misc->priv;
switch (prop_id)
{
case PROP_XALIGN:
g_value_set_float (value, priv->xalign);
break;
case PROP_YALIGN:
g_value_set_float (value, priv->yalign);
break;
case PROP_XPAD:
g_value_set_int (value, priv->xpad);
break;
case PROP_YPAD:
g_value_set_int (value, priv->ypad);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gtk_misc_set_alignment:
* @misc: a #GtkMisc.
* @xalign: the horizontal alignment, from 0 (left) to 1 (right).
* @yalign: the vertical alignment, from 0 (top) to 1 (bottom).
*
* Sets the alignment of the widget.
*/
void
gtk_misc_set_alignment (GtkMisc *misc,
gfloat xalign,
gfloat yalign)
{
GtkMiscPrivate *priv;
GtkWidget *widget;
g_return_if_fail (GTK_IS_MISC (misc));
priv = misc->priv;
if (xalign < 0.0)
xalign = 0.0;
else if (xalign > 1.0)
xalign = 1.0;
if (yalign < 0.0)
yalign = 0.0;
else if (yalign > 1.0)
yalign = 1.0;
if ((xalign != priv->xalign) || (yalign != priv->yalign))
{
g_object_freeze_notify (G_OBJECT (misc));
if (xalign != priv->xalign)
g_object_notify (G_OBJECT (misc), "xalign");
if (yalign != priv->yalign)
g_object_notify (G_OBJECT (misc), "yalign");
priv->xalign = xalign;
priv->yalign = yalign;
/* clear the area that was allocated before the change
*/
widget = GTK_WIDGET (misc);
if (gtk_widget_is_drawable (widget))
gtk_widget_queue_draw (widget);
g_object_thaw_notify (G_OBJECT (misc));
}
}
/**
* gtk_misc_get_alignment:
* @misc: a #GtkMisc
* @xalign: (out) (allow-none): location to store X alignment of @misc, or %NULL
* @yalign: (out) (allow-none): location to store Y alignment of @misc, or %NULL
*
* Gets the X and Y alignment of the widget within its allocation.
* See gtk_misc_set_alignment().
**/
void
gtk_misc_get_alignment (GtkMisc *misc,
gfloat *xalign,
gfloat *yalign)
{
GtkMiscPrivate *priv;
g_return_if_fail (GTK_IS_MISC (misc));
priv = misc->priv;
if (xalign)
*xalign = priv->xalign;
if (yalign)
*yalign = priv->yalign;
}
/**
* gtk_misc_set_padding:
* @misc: a #GtkMisc.
* @xpad: the amount of space to add on the left and right of the widget,
* in pixels.
* @ypad: the amount of space to add on the top and bottom of the widget,
* in pixels.
*
* Sets the amount of space to add around the widget.
*/
void
gtk_misc_set_padding (GtkMisc *misc,
gint xpad,
gint ypad)
{
GtkMiscPrivate *priv;
g_return_if_fail (GTK_IS_MISC (misc));
priv = misc->priv;
if (xpad < 0)
xpad = 0;
if (ypad < 0)
ypad = 0;
if ((xpad != priv->xpad) || (ypad != priv->ypad))
{
g_object_freeze_notify (G_OBJECT (misc));
if (xpad != priv->xpad)
g_object_notify (G_OBJECT (misc), "xpad");
if (ypad != priv->ypad)
g_object_notify (G_OBJECT (misc), "ypad");
priv->xpad = xpad;
priv->ypad = ypad;
if (gtk_widget_is_drawable (GTK_WIDGET (misc)))
gtk_widget_queue_resize (GTK_WIDGET (misc));
g_object_thaw_notify (G_OBJECT (misc));
}
}
/**
* gtk_misc_get_padding:
* @misc: a #GtkMisc
* @xpad: (out) (allow-none): location to store padding in the X
* direction, or %NULL
* @ypad: (out) (allow-none): location to store padding in the Y
* direction, or %NULL
*
* Gets the padding in the X and Y directions of the widget.
* See gtk_misc_set_padding().
**/
void
gtk_misc_get_padding (GtkMisc *misc,
gint *xpad,
gint *ypad)
{
GtkMiscPrivate *priv;
g_return_if_fail (GTK_IS_MISC (misc));
priv = misc->priv;
if (xpad)
*xpad = priv->xpad;
if (ypad)
*ypad = priv->ypad;
}
static void
gtk_misc_realize (GtkWidget *widget)
{
GtkAllocation allocation;
GdkWindow *window;
GdkWindowAttr attributes;
gint attributes_mask;
gtk_widget_set_realized (widget, TRUE);
if (!gtk_widget_get_has_window (widget))
{
window = gtk_widget_get_parent_window (widget);
gtk_widget_set_window (widget, window);
g_object_ref (window);
}
else
{
gtk_widget_get_allocation (widget, &allocation);
attributes.window_type = GDK_WINDOW_CHILD;
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, attributes_mask);
gtk_widget_set_window (widget, window);
gtk_widget_register_window (widget, window);
gdk_window_set_background_pattern (window, NULL);
}
}
/* Semi-private function used by gtk widgets inheriting from
* GtkMisc that takes into account both css padding and border
* and the padding specified with the GtkMisc properties.
*/
void
_gtk_misc_get_padding_and_border (GtkMisc *misc,
GtkBorder *border)
{
GtkStyleContext *context;
GtkStateFlags state;
GtkBorder tmp;
gint xpad, ypad;
g_return_if_fail (GTK_IS_MISC (misc));
context = gtk_widget_get_style_context (GTK_WIDGET (misc));
state = gtk_widget_get_state_flags (GTK_WIDGET (misc));
gtk_style_context_get_padding (context, state, border);
gtk_misc_get_padding (misc, &xpad, &ypad);
border->top += ypad;
border->left += xpad;
border->bottom += ypad;
border->right += xpad;
gtk_style_context_get_border (context, state, &tmp);
border->top += tmp.top;
border->right += tmp.right;
border->bottom += tmp.bottom;
border->left += tmp.left;
}
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