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livetrax/libs/tk/ytk/gtkoffscreenwindow.c
Robin Gareus ad51c7c2ba
Localize stripped down gtk2
This is intended mainly for GNU/Linux distros who will remove
GTK2 support in the near future.
2024-01-06 21:52:48 +01:00

321 lines
9.4 KiB
C

/*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors: Cody Russell <crussell@canonical.com>
* Alexander Larsson <alexl@redhat.com>
*/
#undef GDK_DISABLE_DEPRECATED /* We need gdk_drawable_get_size() */
#include "gtkoffscreenwindow.h"
#include "gtkalias.h"
/**
* SECTION:gtkoffscreenwindow
* @short_description: A toplevel container widget used to manage offscreen
* rendering of child widgets.
* @title: GtkOffscreenWindow
*
* #GtkOffscreenWindow is strictly intended to be used for obtaining
* snapshots of widgets that are not part of a normal widget hierarchy.
* It differs from gtk_widget_get_snapshot() in that the widget you
* want to get a snapshot of need not be displayed on the user's screen
* as a part of a widget hierarchy. However, since #GtkOffscreenWindow
* is a toplevel widget you cannot obtain snapshots of a full window
* with it since you cannot pack a toplevel widget in another toplevel.
*
* The idea is to take a widget and manually set the state of it,
* add it to a #GtkOffscreenWindow and then retrieve the snapshot
* as a #GdkPixmap or #GdkPixbuf.
*
* #GtkOffscreenWindow derives from #GtkWindow only as an implementation
* detail. Applications should not use any API specific to #GtkWindow
* to operate on this object. It should be treated as a #GtkBin that
* has no parent widget.
*
* When contained offscreen widgets are redrawn, #GtkOffscreenWindow
* will emit a #GtkWidget::damage-event signal.
*/
G_DEFINE_TYPE (GtkOffscreenWindow, gtk_offscreen_window, GTK_TYPE_WINDOW);
static void
gtk_offscreen_window_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkBin *bin = GTK_BIN (widget);
gint border_width;
gint default_width, default_height;
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
requisition->width = border_width * 2;
requisition->height = border_width * 2;
if (bin->child && gtk_widget_get_visible (bin->child))
{
GtkRequisition child_req;
gtk_widget_size_request (bin->child, &child_req);
requisition->width += child_req.width;
requisition->height += child_req.height;
}
gtk_window_get_default_size (GTK_WINDOW (widget),
&default_width, &default_height);
if (default_width > 0)
requisition->width = default_width;
if (default_height > 0)
requisition->height = default_height;
}
static void
gtk_offscreen_window_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkBin *bin = GTK_BIN (widget);
gint border_width;
widget->allocation = *allocation;
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (widget->window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
if (bin->child && gtk_widget_get_visible (bin->child))
{
GtkAllocation child_alloc;
child_alloc.x = border_width;
child_alloc.y = border_width;
child_alloc.width = allocation->width - 2 * border_width;
child_alloc.height = allocation->height - 2 * border_width;
gtk_widget_size_allocate (bin->child, &child_alloc);
}
gtk_widget_queue_draw (widget);
}
static void
gtk_offscreen_window_realize (GtkWidget *widget)
{
GtkBin *bin;
GdkWindowAttr attributes;
gint attributes_mask;
gint border_width;
bin = GTK_BIN (widget);
gtk_widget_set_realized (widget, TRUE);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.window_type = GDK_WINDOW_OFFSCREEN;
attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
attributes.visual = gtk_widget_get_visual (widget);
attributes.colormap = gtk_widget_get_colormap (widget);
attributes.wclass = GDK_INPUT_OUTPUT;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask);
gdk_window_set_user_data (widget->window, widget);
if (bin->child)
gtk_widget_set_parent_window (bin->child, widget->window);
widget->style = gtk_style_attach (widget->style, widget->window);
gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
}
static void
gtk_offscreen_window_resize (GtkWidget *widget)
{
GtkAllocation allocation = { 0, 0 };
GtkRequisition requisition;
gtk_widget_size_request (widget, &requisition);
allocation.width = requisition.width;
allocation.height = requisition.height;
gtk_widget_size_allocate (widget, &allocation);
}
static void
move_focus (GtkWidget *widget,
GtkDirectionType dir)
{
gtk_widget_child_focus (widget, dir);
if (!GTK_CONTAINER (widget)->focus_child)
gtk_window_set_focus (GTK_WINDOW (widget), NULL);
}
static void
gtk_offscreen_window_show (GtkWidget *widget)
{
gboolean need_resize;
GtkContainer *container;
GTK_WIDGET_SET_FLAGS (widget, GTK_VISIBLE);
container = GTK_CONTAINER (widget);
need_resize = container->need_resize || !gtk_widget_get_realized (widget);
container->need_resize = FALSE;
if (need_resize)
gtk_offscreen_window_resize (widget);
gtk_widget_map (widget);
/* Try to make sure that we have some focused widget */
if (!gtk_window_get_focus (GTK_WINDOW (widget)))
move_focus (widget, GTK_DIR_TAB_FORWARD);
}
static void
gtk_offscreen_window_hide (GtkWidget *widget)
{
GTK_WIDGET_UNSET_FLAGS (widget, GTK_VISIBLE);
gtk_widget_unmap (widget);
}
static void
gtk_offscreen_window_check_resize (GtkContainer *container)
{
GtkWidget *widget = GTK_WIDGET (container);
if (gtk_widget_get_visible (widget))
gtk_offscreen_window_resize (widget);
}
static void
gtk_offscreen_window_class_init (GtkOffscreenWindowClass *class)
{
GtkWidgetClass *widget_class;
GtkContainerClass *container_class;
widget_class = GTK_WIDGET_CLASS (class);
container_class = GTK_CONTAINER_CLASS (class);
widget_class->realize = gtk_offscreen_window_realize;
widget_class->show = gtk_offscreen_window_show;
widget_class->hide = gtk_offscreen_window_hide;
widget_class->size_request = gtk_offscreen_window_size_request;
widget_class->size_allocate = gtk_offscreen_window_size_allocate;
container_class->check_resize = gtk_offscreen_window_check_resize;
}
static void
gtk_offscreen_window_init (GtkOffscreenWindow *window)
{
}
/* --- functions --- */
/**
* gtk_offscreen_window_new:
*
* Creates a toplevel container widget that is used to retrieve
* snapshots of widgets without showing them on the screen. For
* widgets that are on the screen and part of a normal widget
* hierarchy, gtk_widget_get_snapshot() can be used instead.
*
* Return value: A pointer to a #GtkWidget
*
* Since: 2.20
*/
GtkWidget *
gtk_offscreen_window_new (void)
{
return g_object_new (gtk_offscreen_window_get_type (), NULL);
}
/**
* gtk_offscreen_window_get_pixmap:
* @offscreen: the #GtkOffscreenWindow contained widget.
*
* Retrieves a snapshot of the contained widget in the form of
* a #GdkPixmap. If you need to keep this around over window
* resizes then you should add a reference to it.
*
* Returns: (transfer none): A #GdkPixmap pointer to the offscreen pixmap,
* or %NULL.
*
* Since: 2.20
*/
GdkPixmap *
gtk_offscreen_window_get_pixmap (GtkOffscreenWindow *offscreen)
{
g_return_val_if_fail (GTK_IS_OFFSCREEN_WINDOW (offscreen), NULL);
return gdk_offscreen_window_get_pixmap (GTK_WIDGET (offscreen)->window);
}
/**
* gtk_offscreen_window_get_pixbuf:
* @offscreen: the #GtkOffscreenWindow contained widget.
*
* Retrieves a snapshot of the contained widget in the form of
* a #GdkPixbuf. This is a new pixbuf with a reference count of 1,
* and the application should unreference it once it is no longer
* needed.
*
* Returns: (transfer full): A #GdkPixbuf pointer, or %NULL.
*
* Since: 2.20
*/
GdkPixbuf *
gtk_offscreen_window_get_pixbuf (GtkOffscreenWindow *offscreen)
{
GdkPixmap *pixmap = NULL;
GdkPixbuf *pixbuf = NULL;
g_return_val_if_fail (GTK_IS_OFFSCREEN_WINDOW (offscreen), NULL);
pixmap = gdk_offscreen_window_get_pixmap (GTK_WIDGET (offscreen)->window);
if (pixmap != NULL)
{
gint width, height;
gdk_drawable_get_size (pixmap, &width, &height);
pixbuf = gdk_pixbuf_get_from_drawable (NULL, pixmap, NULL,
0, 0, 0, 0,
width, height);
}
return pixbuf;
}
#define __GTK_OFFSCREEN_WINDOW_C__
#include "gtkaliasdef.c"