forked from AuroraMiddleware/gtk
325 lines
11 KiB
C
325 lines
11 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, 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 1997-2000. 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:gtkfixed
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* @Short_description: A container which allows you to position
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* widgets at fixed coordinates
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* @Title: GtkFixed
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*
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* The #GtkFixed widget is a container which can place child widgets
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* at fixed positions and with fixed sizes, given in pixels. #GtkFixed
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* performs no automatic layout management.
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*
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* For most applications, you should not use this container! It keeps
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* you from having to learn about the other GTK+ containers, but it
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* results in broken applications. With #GtkFixed, the following
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* things will result in truncated text, overlapping widgets, and
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* other display bugs:
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*
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* - Themes, which may change widget sizes.
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*
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* - Fonts other than the one you used to write the app will of course
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* change the size of widgets containing text; keep in mind that
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* users may use a larger font because of difficulty reading the
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* default, or they may be using a different OS that provides different fonts.
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*
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* - Translation of text into other languages changes its size. Also,
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* display of non-English text will use a different font in many
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* cases.
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*
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* In addition, #GtkFixed does not pay attention to text direction and thus may
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* produce unwanted results if your app is run under right-to-left languages
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* such as Hebrew or Arabic. That is: normally GTK will order containers
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* appropriately for the text direction, e.g. to put labels to the right of the
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* thing they label when using an RTL language, but it can’t do that with
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* #GtkFixed. So if you need to reorder widgets depending on the text direction,
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* you would need to manually detect it and adjust child positions accordingly.
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*
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* Finally, fixed positioning makes it kind of annoying to add/remove
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* GUI elements, since you have to reposition all the other
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* elements. This is a long-term maintenance problem for your
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* application.
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*
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* If you know none of these things are an issue for your application,
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* and prefer the simplicity of #GtkFixed, by all means use the
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* widget. But you should be aware of the tradeoffs.
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*/
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#include "config.h"
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#include "gtkfixed.h"
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#include "gtkcontainerprivate.h"
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#include "gtkfixedlayout.h"
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#include "gtkintl.h"
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#include "gtkprivate.h"
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#include "gtkwidgetprivate.h"
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static void gtk_fixed_add (GtkContainer *container,
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GtkWidget *widget);
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static void gtk_fixed_remove (GtkContainer *container,
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GtkWidget *widget);
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static void gtk_fixed_forall (GtkContainer *container,
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GtkCallback callback,
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gpointer callback_data);
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static GType gtk_fixed_child_type (GtkContainer *container);
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typedef struct {
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GtkLayoutManager *layout;
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} GtkFixedPrivate;
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G_DEFINE_TYPE_WITH_PRIVATE (GtkFixed, gtk_fixed, GTK_TYPE_CONTAINER)
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static void
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gtk_fixed_class_init (GtkFixedClass *klass)
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{
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GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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container_class->add = gtk_fixed_add;
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container_class->remove = gtk_fixed_remove;
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container_class->forall = gtk_fixed_forall;
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container_class->child_type = gtk_fixed_child_type;
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gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_FIXED_LAYOUT);
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}
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static GType
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gtk_fixed_child_type (GtkContainer *container)
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{
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return GTK_TYPE_WIDGET;
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}
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static void
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gtk_fixed_init (GtkFixed *self)
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{
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GtkFixedPrivate *priv = gtk_fixed_get_instance_private (self);
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gtk_widget_set_overflow (GTK_WIDGET (self), GTK_OVERFLOW_HIDDEN);
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priv->layout = gtk_widget_get_layout_manager (GTK_WIDGET (self));
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}
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/**
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* gtk_fixed_new:
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*
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* Creates a new #GtkFixed.
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*
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* Returns: a new #GtkFixed.
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*/
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GtkWidget*
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gtk_fixed_new (void)
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{
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return g_object_new (GTK_TYPE_FIXED, NULL);
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}
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/**
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* gtk_fixed_put:
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* @fixed: a #GtkFixed.
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* @widget: the widget to add.
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* @x: the horizontal position to place the widget at.
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* @y: the vertical position to place the widget at.
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*
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* Adds a widget to a #GtkFixed container and assigns a translation
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* transformation to the given @x and @y coordinates to it.
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*/
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void
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gtk_fixed_put (GtkFixed *fixed,
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GtkWidget *widget,
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gint x,
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gint y)
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{
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GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
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GtkFixedLayoutChild *child_info;
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GskTransform *transform = NULL;
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g_return_if_fail (GTK_IS_FIXED (fixed));
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (_gtk_widget_get_parent (widget) == NULL);
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gtk_widget_set_parent (widget, GTK_WIDGET (fixed));
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child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
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transform = gsk_transform_translate (transform, &GRAPHENE_POINT_INIT (x, y));
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gtk_fixed_layout_child_set_transform (child_info, transform);
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gsk_transform_unref (transform);
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}
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/**
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* gtk_fixed_get_child_position:
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* @fixed: a #GtkFixed
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* @widget: a child of @fixed
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* @x: (out): the horizontal position of the @widget
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* @y: (out): the vertical position of the @widget
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*
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* Retrieves the translation transformation of the given child #GtkWidget
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* in the given #GtkFixed container.
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*
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* See also: gtk_fixed_get_child_transform().
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*/
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void
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gtk_fixed_get_child_position (GtkFixed *fixed,
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GtkWidget *widget,
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int *x,
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int *y)
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{
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GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
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GtkFixedLayoutChild *child_info;
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float pos_x = 0.f, pos_y = 0.f;
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GskTransform *transform;
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g_return_if_fail (GTK_IS_FIXED (fixed));
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (x != NULL);
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g_return_if_fail (y != NULL);
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g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed));
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child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
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transform = gtk_fixed_layout_child_get_transform (child_info);
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gsk_transform_to_translate (transform, &pos_x, &pos_y);
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*x = floorf (pos_x);
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*y = floorf (pos_y);
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}
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/**
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* gtk_fixed_set_child_transform:
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* @fixed: a #GtkFixed
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* @widget: a #GtkWidget, child of @fixed
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* @transform: (nullable): the transformation assigned to @widget or %NULL
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* to reset @widget's transform
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*
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* Sets the transformation for @widget.
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*
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* This is a convenience function that retrieves the #GtkFixedLayoutChild
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* instance associated to @widget and calls gtk_fixed_layout_child_set_transform().
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*/
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void
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gtk_fixed_set_child_transform (GtkFixed *fixed,
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GtkWidget *widget,
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GskTransform *transform)
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{
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GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
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GtkFixedLayoutChild *child_info;
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g_return_if_fail (GTK_IS_FIXED (fixed));
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed));
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child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
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gtk_fixed_layout_child_set_transform (child_info, transform);
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}
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/**
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* gtk_fixed_get_child_transform:
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* @fixed: a #GtkFixed
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* @widget: a #GtkWidget, child of @fixed
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*
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* Retrieves the transformation for @widget set using
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* gtk_fixed_set_child_transform().
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*
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* Returns: (transfer none) (nullable): a #GskTransform or %NULL
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* in case no transform has been set on @widget
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*/
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GskTransform *
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gtk_fixed_get_child_transform (GtkFixed *fixed,
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GtkWidget *widget)
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{
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GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
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GtkFixedLayoutChild *child_info;
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g_return_val_if_fail (GTK_IS_FIXED (fixed), NULL);
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g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
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g_return_val_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed), NULL);
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child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
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return gtk_fixed_layout_child_get_transform (child_info);
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}
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/**
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* gtk_fixed_move:
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* @fixed: a #GtkFixed.
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* @widget: the child widget.
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* @x: the horizontal position to move the widget to.
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* @y: the vertical position to move the widget to.
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*
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* Sets a translation transformation to the given @x and @y coordinates to
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* the child @widget of the given #GtkFixed container.
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*/
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void
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gtk_fixed_move (GtkFixed *fixed,
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GtkWidget *widget,
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gint x,
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gint y)
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{
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GtkFixedPrivate *priv = gtk_fixed_get_instance_private (fixed);
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GtkFixedLayoutChild *child_info;
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GskTransform *transform = NULL;
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g_return_if_fail (GTK_IS_FIXED (fixed));
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g_return_if_fail (GTK_IS_WIDGET (widget));
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g_return_if_fail (gtk_widget_get_parent (widget) == GTK_WIDGET (fixed));
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child_info = GTK_FIXED_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (priv->layout, widget));
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transform = gsk_transform_translate (transform, &GRAPHENE_POINT_INIT (x, y));
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gtk_fixed_layout_child_set_transform (child_info, transform);
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gsk_transform_unref (transform);
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}
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static void
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gtk_fixed_add (GtkContainer *container,
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GtkWidget *widget)
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{
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gtk_fixed_put (GTK_FIXED (container), widget, 0, 0);
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}
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static void
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gtk_fixed_remove (GtkContainer *container,
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GtkWidget *widget)
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{
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gtk_widget_unparent (widget);
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}
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static void
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gtk_fixed_forall (GtkContainer *container,
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GtkCallback callback,
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gpointer callback_data)
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{
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GtkWidget *widget = GTK_WIDGET (container);
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GtkWidget *child;
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child = gtk_widget_get_first_child (widget);
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while (child)
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{
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GtkWidget *next = gtk_widget_get_next_sibling (child);
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(* callback) (child, callback_data);
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child = next;
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}
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}
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