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gdk: add API to convert coords between parent and child windows

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which also works for offscreen windows and their embedder.
Also add gdk_window_get_effective_parent() and
gdk_window_get_effective_toplevel() which are offscreen aware.
This commit is contained in:
Michael Natterer
2010-04-15 12:59:44 +02:00
parent 615f91dadd
commit 5a52d2a2f0
3 changed files with 237 additions and 19 deletions
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4
gdk/gdk.symbols
View File

@ -685,6 +685,8 @@ gdk_window_clear
gdk_window_clear_area
gdk_window_clear_area_e
gdk_window_constrain_size
gdk_window_coords_from_parent
gdk_window_coords_to_parent
gdk_window_destroy
gdk_window_end_paint
gdk_window_flush
@ -694,10 +696,12 @@ gdk_window_freeze_updates
gdk_window_get_children
gdk_window_get_internal_paint_info
gdk_window_get_parent
gdk_window_get_effective_parent
gdk_window_get_pointer
gdk_window_get_position
gdk_window_get_state
gdk_window_get_toplevel
gdk_window_get_effective_toplevel
#ifndef GDK_DISABLE_DEPRECATED
gdk_window_get_toplevels
#endif

239
gdk/gdkwindow.c
View File

@ -2237,6 +2237,30 @@ gdk_window_is_destroyed (GdkWindow *window)
return GDK_WINDOW_DESTROYED (window);
}
static void
to_embedder (GdkWindowObject *window,
gdouble offscreen_x,
gdouble offscreen_y,
gdouble *embedder_x,
gdouble *embedder_y)
{
g_signal_emit (window, signals[TO_EMBEDDER], 0,
offscreen_x, offscreen_y,
embedder_x, embedder_y);
}
static void
from_embedder (GdkWindowObject *window,
gdouble embedder_x,
gdouble embedder_y,
gdouble *offscreen_x,
gdouble *offscreen_y)
{
g_signal_emit (window, signals[FROM_EMBEDDER], 0,
embedder_x, embedder_y,
offscreen_x, offscreen_y);
}
/**
* gdk_window_get_position:
* @window: a #GdkWindow
@ -2280,6 +2304,11 @@ gdk_window_get_position (GdkWindow *window,
* matter for toplevel windows, because the window manager may choose
* to reparent them.
*
* Note that you should use gdk_window_get_effective_parent() when
* writing generic code that walks up a window hierarchy, because
* gdk_window_get_parent() will most likely not do what you expect if
* there are offscreen windows in the hierarchy.
*
* Return value: parent of @window
**/
GdkWindow*
@ -2290,6 +2319,35 @@ gdk_window_get_parent (GdkWindow *window)
return (GdkWindow*) ((GdkWindowObject*) window)->parent;
}
/**
* gdk_window_get_effective_parent:
* @window: a #GdkWindow
*
* Obtains the parent of @window, as known to GDK. Works like
* gdk_window_get_parent() for normal windows, but returns the
* window's embedder for offscreen windows.
*
* See also: gdk_offscreen_window_get_embedder()
*
* Return value: effective parent of @window
*
* Since: 2.22
**/
GdkWindow *
gdk_window_get_effective_parent (GdkWindow *window)
{
GdkWindowObject *obj;
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
obj = (GdkWindowObject *)window;
if (obj->window_type == GDK_WINDOW_OFFSCREEN)
return gdk_offscreen_window_get_embedder (window);
else
return (GdkWindow *) obj->parent;
}
/**
* gdk_window_get_toplevel:
* @window: a #GdkWindow
@ -2300,9 +2358,14 @@ gdk_window_get_parent (GdkWindow *window)
* toplevel window, as is a %GDK_WINDOW_CHILD window that
* has a root window as parent.
*
* Note that you should use gdk_window_get_effective_toplevel() when
* you want to get to a window's toplevel as seen on screen, because
* gdk_window_get_toplevel() will most likely not do what you expect
* if there are offscreen windows in the hierarchy.
*
* Return value: the toplevel window containing @window
**/
GdkWindow*
GdkWindow *
gdk_window_get_toplevel (GdkWindow *window)
{
GdkWindowObject *obj;
@ -2321,6 +2384,35 @@ gdk_window_get_toplevel (GdkWindow *window)
return GDK_WINDOW (obj);
}
/**
* gdk_window_get_effective_toplevel:
* @window: a #GdkWindow
*
* Gets the toplevel window that's an ancestor of @window.
*
* Works like gdk_window_get_toplevel(), but treats an offscreen window's
* embedder as its parent, using gdk_window_get_effective_parent().
*
* See also: gdk_offscreen_window_get_embedder()
*
* Return value: the effective toplevel window containing @window
*
* Since: 2.22
**/
GdkWindow *
gdk_window_get_effective_toplevel (GdkWindow *window)
{
GdkWindow *parent;
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
while ((parent = gdk_window_get_effective_parent (window)) != NULL &&
(gdk_window_get_window_type (parent) != GDK_WINDOW_ROOT))
window = parent;
return window;
}
/**
* gdk_window_get_children:
* @window: a #GdkWindow
@ -7977,10 +8069,10 @@ gdk_window_get_geometry (GdkWindow *window,
}
else
{
if (x)
*x = private->x;
if (y)
*y = private->y;
if (x)
*x = private->x;
if (y)
*y = private->y;
if (width)
*width = private->width;
if (height)
@ -8079,6 +8171,129 @@ gdk_window_get_root_coords (GdkWindow *window,
root_x, root_y);
}
/**
* gdk_window_coords_to_parent:
* @window: a child window
* @x: X coordinate in child's coordinate system
* @y: Y coordinate in child's coordinate system
* @parent_x: return location for X coordinate in parent's coordinate system
* @parent_y: return location for Y coordinate in parent's coordinate system
*
* Transforms window coordinates from a child window to its parent
* window, where the parent window is the normal parent as returned by
* gdk_window_get_parent() for normal windows, and the window's
* embedder as returned by gdk_offscreen_window_get_embedder() for
* offscreen windows.
*
* For normal windows, calling this function is equivalent to adding
* the return values of gdk_window_get_position() to the child coordinates.
* For offscreen windows however (which can be arbitrarily transformed),
* this function calls the GdkWindow::to-embedder: signal to translate
* the coordinates.
*
* You should always use this function when writing generic code that
* walks up a window hierarchy.
*
* See also: gdk_window_coords_from_parent()
*
* Since: 2.22
**/
void
gdk_window_coords_to_parent (GdkWindow *window,
gdouble x,
gdouble y,
gdouble *parent_x,
gdouble *parent_y)
{
GdkWindowObject *obj;
g_return_if_fail (GDK_IS_WINDOW (window));
obj = (GdkWindowObject *) window;
if (obj->window_type == GDK_WINDOW_OFFSCREEN)
{
gdouble px, py;
to_embedder (obj, x, y, &px, &py);
if (parent_x)
*parent_x = px;
if (parent_y)
*parent_y = py;
}
else
{
if (parent_x)
*parent_x = x + obj->x;
if (parent_y)
*parent_y = y + obj->y;
}
}
/**
* gdk_window_coords_from_parent:
* @window: a child window
* @parent_x: X coordinate in parent's coordinate system
* @parent_y: Y coordinate in parent's coordinate system
* @x: return location for X coordinate in child's coordinate system
* @y: return location for Y coordinate in child's coordinate system
*
* Transforms window coordinates from a parent window to a child
* window, where the parent window is the normal parent as returned by
* gdk_window_get_parent() for normal windows, and the window's
* embedder as returned by gdk_offscreen_window_get_embedder() for
* offscreen windows.
*
* For normal windows, calling this function is equivalent to subtracting
* the return values of gdk_window_get_position() from the parent coordinates.
* For offscreen windows however (which can be arbitrarily transformed),
* this function calls the GdkWindow::from-embedder: signal to translate
* the coordinates.
*
* You should always use this function when writing generic code that
* walks down a window hierarchy.
*
* See also: gdk_window_coords_to_parent()
*
* Since: 2.22
**/
void
gdk_window_coords_from_parent (GdkWindow *window,
gdouble parent_x,
gdouble parent_y,
gdouble *x,
gdouble *y)
{
GdkWindowObject *obj;
g_return_if_fail (GDK_IS_WINDOW (window));
obj = (GdkWindowObject *) window;
if (obj->window_type == GDK_WINDOW_OFFSCREEN)
{
gdouble cx, cy;
from_embedder (obj, parent_x, parent_y, &cx, &cy);
if (x)
*x = cx;
if (y)
*y = cy;
}
else
{
if (x)
*x = parent_x - obj->x;
if (y)
*y = parent_y - obj->y;
}
}
/**
* gdk_window_get_deskrelative_origin:
@ -8969,20 +9184,6 @@ update_cursor (GdkDisplay *display)
impl_iface->set_cursor ((GdkWindow *)toplevel, cursor_window->cursor);
}
static void
from_embedder (GdkWindowObject *window,
gdouble embedder_x,
gdouble embedder_y,
gdouble *offscreen_x,
gdouble *offscreen_y)
{
g_signal_emit (window,
signals[FROM_EMBEDDER], 0,
embedder_x, embedder_y,
offscreen_x, offscreen_y,
NULL);
}
static void
convert_coords_to_child (GdkWindowObject *child,
gdouble x,

13
gdk/gdkwindow.h
View File

@ -546,6 +546,16 @@ void gdk_window_get_root_coords (GdkWindow *window,
gint y,
gint *root_x,
gint *root_y);
void gdk_window_coords_to_parent (GdkWindow *window,
gdouble x,
gdouble y,
gdouble *parent_x,
gdouble *parent_y);
void gdk_window_coords_from_parent (GdkWindow *window,
gdouble parent_x,
gdouble parent_y,
gdouble *x,
gdouble *y);
#if !defined (GDK_DISABLE_DEPRECATED) || defined (GTK_COMPILATION) || defined (GDK_COMPILATION)
/* Used by gtk_handle_box_button_changed () */
@ -566,6 +576,9 @@ GdkWindow* gdk_window_get_pointer (GdkWindow *window,
GdkWindow * gdk_window_get_parent (GdkWindow *window);
GdkWindow * gdk_window_get_toplevel (GdkWindow *window);
GdkWindow * gdk_window_get_effective_parent (GdkWindow *window);
GdkWindow * gdk_window_get_effective_toplevel (GdkWindow *window);
GList * gdk_window_get_children (GdkWindow *window);
GList * gdk_window_peek_children (GdkWindow *window);
GdkEventMask gdk_window_get_events (GdkWindow *window);