forked from AuroraMiddleware/gtk
59c6862a03
Instead of manually creating the layout manager inside the instance initialization function, we can let GtkWidget do that for us.
324 lines
10 KiB
C
324 lines
10 KiB
C
/* 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/.
|
||
*/
|
||
|
||
/**
|
||
* SECTION:gtkfixed
|
||
* @Short_description: A container which allows you to position
|
||
* widgets at fixed coordinates
|
||
* @Title: GtkFixed
|
||
*
|
||
* The #GtkFixed widget is a container which can place child widgets
|
||
* at fixed positions and with fixed sizes, given in pixels. #GtkFixed
|
||
* performs no automatic layout management.
|
||
*
|
||
* For most applications, you should not use this container! It keeps
|
||
* you from having to learn about the other GTK+ containers, but it
|
||
* results in broken applications. With #GtkFixed, the following
|
||
* things will result in truncated text, overlapping widgets, and
|
||
* other display bugs:
|
||
*
|
||
* - Themes, which may change widget sizes.
|
||
*
|
||
* - Fonts other than the one you used to write the app will of course
|
||
* change the size of widgets containing text; keep in mind that
|
||
* users may use a larger font because of difficulty reading the
|
||
* default, or they may be using a different OS that provides different fonts.
|
||
*
|
||
* - Translation of text into other languages changes its size. Also,
|
||
* display of non-English text will use a different font in many
|
||
* cases.
|
||
*
|
||
* In addition, #GtkFixed does not pay attention to text direction and thus may
|
||
* produce unwanted results if your app is run under right-to-left languages
|
||
* such as Hebrew or Arabic. That is: normally GTK will order containers
|
||
* appropriately for the text direction, e.g. to put labels to the right of the
|
||
* thing they label when using an RTL language, but it can’t do that with
|
||
* #GtkFixed. So if you need to reorder widgets depending on the text direction,
|
||
* you would need to manually detect it and adjust child positions accordingly.
|
||
*
|
||
* Finally, fixed positioning makes it kind of annoying to add/remove
|
||
* GUI elements, since you have to reposition all the other
|
||
* elements. This is a long-term maintenance problem for your
|
||
* application.
|
||
*
|
||
* If you know none of these things are an issue for your application,
|
||
* and prefer the simplicity of #GtkFixed, by all means use the
|
||
* widget. But you should be aware of the tradeoffs.
|
||
*/
|
||
|
||
#include "config.h"
|
||
|
||
#include "gtkfixed.h"
|
||
|
||
#include "gtkcontainerprivate.h"
|
||
#include "gtkfixedlayout.h"
|
||
#include "gtkintl.h"
|
||
#include "gtkprivate.h"
|
||
#include "gtkwidgetprivate.h"
|
||
|
||
static void gtk_fixed_add (GtkContainer *container,
|
||
GtkWidget *widget);
|
||
static void gtk_fixed_remove (GtkContainer *container,
|
||
GtkWidget *widget);
|
||
static void gtk_fixed_forall (GtkContainer *container,
|
||
GtkCallback callback,
|
||
gpointer callback_data);
|
||
static GType gtk_fixed_child_type (GtkContainer *container);
|
||
|
||
typedef struct {
|
||
GtkLayoutManager *layout;
|
||
} GtkFixedPrivate;
|
||
|
||
G_DEFINE_TYPE_WITH_PRIVATE (GtkFixed, gtk_fixed, GTK_TYPE_CONTAINER)
|
||
|
||
static void
|
||
gtk_fixed_class_init (GtkFixedClass *klass)
|
||
{
|
||
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
|
||
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
|
||
|
||
container_class->add = gtk_fixed_add;
|
||
container_class->remove = gtk_fixed_remove;
|
||
container_class->forall = gtk_fixed_forall;
|
||
container_class->child_type = gtk_fixed_child_type;
|
||
|
||
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_FIXED_LAYOUT);
|
||
}
|
||
|
||
static GType
|
||
gtk_fixed_child_type (GtkContainer *container)
|
||
{
|
||
return GTK_TYPE_WIDGET;
|
||
}
|
||
|
||
static void
|
||
gtk_fixed_init (GtkFixed *self)
|
||
{
|
||
GtkFixedPrivate *priv = gtk_fixed_get_instance_private (self);
|
||
|
||
gtk_widget_set_has_surface (GTK_WIDGET (self), FALSE);
|
||
gtk_widget_set_overflow (GTK_WIDGET (self), GTK_OVERFLOW_HIDDEN);
|
||
|
||
priv->layout = gtk_widget_get_layout_manager (GTK_WIDGET (self));
|
||
}
|
||
|
||
/**
|
||
* gtk_fixed_new:
|
||
*
|
||
* Creates a new #GtkFixed.
|
||
*
|
||
* Returns: a new #GtkFixed.
|
||
*/
|
||
GtkWidget*
|
||
gtk_fixed_new (void)
|
||
{
|
||
return g_object_new (GTK_TYPE_FIXED, NULL);
|
||
}
|
||
|
||
/**
|
||
* gtk_fixed_put:
|
||
* @fixed: a #GtkFixed.
|
||
* @widget: the widget to add.
|
||
* @x: the horizontal position to place the widget at.
|
||
* @y: the vertical position to place the widget at.
|
||
*
|
||
* Adds a widget to a #GtkFixed container and assigns a translation
|
||
* transformation to the given @x and @y coordinates to it.
|
||
*/
|
||
void
|
||
gtk_fixed_put (GtkFixed *fixed,
|
||
GtkWidget *widget,
|
||
gint x,
|
||
gint y)
|
||
{
|
||
GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
|
||
GtkFixedLayoutChild *child_info;
|
||
GskTransform *transform = NULL;
|
||
|
||
g_return_if_fail (GTK_IS_FIXED (fixed));
|
||
g_return_if_fail (GTK_IS_WIDGET (widget));
|
||
g_return_if_fail (_gtk_widget_get_parent (widget) == NULL);
|
||
|
||
gtk_widget_set_parent (widget, GTK_WIDGET (fixed));
|
||
|
||
child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
|
||
|
||
transform = gsk_transform_translate (transform, &GRAPHENE_POINT_INIT (x, y));
|
||
gtk_fixed_layout_child_set_position (child_info, transform);
|
||
gsk_transform_unref (transform);
|
||
}
|
||
|
||
/**
|
||
* gtk_fixed_get_child_position:
|
||
* @fixed: a #GtkFixed
|
||
* @widget: a child of @fixed
|
||
* @x: (out): the horizontal position of the @widget
|
||
* @y: (out): the vertical position of the @widget
|
||
*
|
||
* Retrieves the translation transformation of the given child #GtkWidget
|
||
* in the given #GtkFixed container.
|
||
*
|
||
* See also: gtk_fixed_get_child_transform().
|
||
*/
|
||
void
|
||
gtk_fixed_get_child_position (GtkFixed *fixed,
|
||
GtkWidget *widget,
|
||
gint *x,
|
||
gint *y)
|
||
{
|
||
GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
|
||
GtkFixedLayoutChild *child_info;
|
||
float pos_x = 0.f, pos_y = 0.f;
|
||
GskTransform *transform;
|
||
|
||
g_return_if_fail (GTK_IS_FIXED (fixed));
|
||
g_return_if_fail (GTK_IS_WIDGET (widget));
|
||
g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed));
|
||
|
||
child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
|
||
transform = gtk_fixed_layout_child_get_position (child_info);
|
||
gsk_transform_to_translate (transform, &pos_x, &pos_y);
|
||
|
||
if (x != NULL)
|
||
*x = floorf (pos_x);
|
||
if (y != NULL)
|
||
*y = floorf (pos_y);
|
||
}
|
||
|
||
/**
|
||
* gtk_fixed_set_child_transform:
|
||
* @fixed: a #GtkFixed
|
||
* @widget: a #GtkWidget, child of @fixed
|
||
* @transform: (nullable): the transformation assigned to @widget
|
||
*
|
||
* Sets the transformation for @widget.
|
||
*
|
||
* This is a convenience function that retrieves the #GtkFixedLayoutChild
|
||
* instance associated to @widget and calls gtk_fixed_layout_child_set_position().
|
||
*/
|
||
void
|
||
gtk_fixed_set_child_transform (GtkFixed *fixed,
|
||
GtkWidget *widget,
|
||
GskTransform *transform)
|
||
{
|
||
GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
|
||
GtkFixedLayoutChild *child_info;
|
||
|
||
g_return_if_fail (GTK_IS_FIXED (fixed));
|
||
g_return_if_fail (GTK_IS_WIDGET (widget));
|
||
g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed));
|
||
|
||
child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
|
||
gtk_fixed_layout_child_set_position (child_info, transform);
|
||
}
|
||
|
||
/**
|
||
* gtk_fixed_get_child_transform:
|
||
* @fixed: a #GtkFixed
|
||
* @widget: a #GtkWidget, child of @fixed
|
||
*
|
||
* Retrieves the transformation for @widget set using
|
||
* gtk_fixed_set_child_transform().
|
||
*
|
||
* Returns: (transfer none) (nullable): a #GskTransform
|
||
*/
|
||
GskTransform *
|
||
gtk_fixed_get_child_transform (GtkFixed *fixed,
|
||
GtkWidget *widget)
|
||
{
|
||
GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
|
||
GtkFixedLayoutChild *child_info;
|
||
|
||
g_return_val_if_fail (GTK_IS_FIXED (fixed), NULL);
|
||
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
|
||
g_return_val_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed), NULL);
|
||
|
||
child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
|
||
return gtk_fixed_layout_child_get_position (child_info);
|
||
}
|
||
|
||
/**
|
||
* gtk_fixed_move:
|
||
* @fixed: a #GtkFixed.
|
||
* @widget: the child widget.
|
||
* @x: the horizontal position to move the widget to.
|
||
* @y: the vertical position to move the widget to.
|
||
*
|
||
* Sets a translation transformation to the given @x and @y coordinates to
|
||
* the child @widget of the given #GtkFixed container.
|
||
*/
|
||
void
|
||
gtk_fixed_move (GtkFixed *fixed,
|
||
GtkWidget *widget,
|
||
gint x,
|
||
gint y)
|
||
{
|
||
GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
|
||
GtkFixedLayoutChild *child_info;
|
||
GskTransform *transform = NULL;
|
||
|
||
g_return_if_fail (GTK_IS_FIXED (fixed));
|
||
g_return_if_fail (GTK_IS_WIDGET (widget));
|
||
g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed));
|
||
|
||
child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
|
||
|
||
transform = gsk_transform_translate (transform, &GRAPHENE_POINT_INIT (x, y));
|
||
gtk_fixed_layout_child_set_position (child_info, transform);
|
||
gsk_transform_unref (transform);
|
||
}
|
||
|
||
static void
|
||
gtk_fixed_add (GtkContainer *container,
|
||
GtkWidget *widget)
|
||
{
|
||
gtk_fixed_put (GTK_FIXED (container), widget, 0, 0);
|
||
}
|
||
|
||
static void
|
||
gtk_fixed_remove (GtkContainer *container,
|
||
GtkWidget *widget)
|
||
{
|
||
gtk_widget_unparent (widget);
|
||
}
|
||
|
||
static void
|
||
gtk_fixed_forall (GtkContainer *container,
|
||
GtkCallback callback,
|
||
gpointer callback_data)
|
||
{
|
||
GtkWidget *widget = GTK_WIDGET (container);
|
||
GtkWidget *child;
|
||
|
||
child = gtk_widget_get_first_child (widget);
|
||
while (child)
|
||
{
|
||
GtkWidget *next = gtk_widget_get_next_sibling (child);
|
||
|
||
(* callback) (child, callback_data);
|
||
|
||
child = next;
|
||
}
|
||
}
|