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gnome-shell/src/tray/na-tray-child.c

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/* na-tray-child.c
* Copyright (C) 2002 Anders Carlsson <andersca@gnu.org>
* Copyright (C) 2003-2006 Vincent Untz
* Copyright (C) 2008 Red Hat, Inc.
*
* 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/>.
*/
#include <config.h>
#include <string.h>
#include "na-tray-child.h"
#include <gdk/gdk.h>
#include <gdk/gdkx.h>
#include <X11/Xatom.h>
G_DEFINE_TYPE (NaTrayChild, na_tray_child, GTK_TYPE_SOCKET)
static void
na_tray_child_finalize (GObject *object)
{
G_OBJECT_CLASS (na_tray_child_parent_class)->finalize (object);
}
static void
na_tray_child_realize (GtkWidget *widget)
{
NaTrayChild *child = NA_TRAY_CHILD (widget);
GdkVisual *visual = gtk_widget_get_visual (widget);
GdkWindow *window;
GTK_WIDGET_CLASS (na_tray_child_parent_class)->realize (widget);
window = gtk_widget_get_window (widget);
if (child->has_alpha)
{
/* We have real transparency with an ARGB visual and the Composite
* extension. */
/* Set a transparent background */
cairo_pattern_t *transparent = cairo_pattern_create_rgba (0, 0, 0, 0);
gdk_window_set_background_pattern (window, transparent);
gdk_window_set_composited (window, TRUE);
cairo_pattern_destroy (transparent);
child->parent_relative_bg = FALSE;
}
else if (visual == gdk_window_get_visual (gdk_window_get_parent (window)))
{
/* Otherwise, if the visual matches the visual of the parent window, we
* can use a parent-relative background and fake transparency. */
gdk_window_set_background_pattern (window, NULL);
child->parent_relative_bg = TRUE;
}
else
{
/* Nothing to do; the icon will sit on top of an ugly gray box */
child->parent_relative_bg = FALSE;
}
gdk_window_set_composited (window, child->composited);
gtk_widget_set_app_paintable (GTK_WIDGET (child),
child->parent_relative_bg || child->has_alpha);
/* Double-buffering will interfere with the parent-relative-background fake
* transparency, since the double-buffer code doesn't know how to fill in the
* background of the double-buffer correctly.
*/
gtk_widget_set_double_buffered (GTK_WIDGET (child),
child->parent_relative_bg);
}
static void
na_tray_child_style_set (GtkWidget *widget,
GtkStyle *previous_style)
{
/* The default handler resets the background according to the new style.
* We either use a transparent background or a parent-relative background
* and ignore the style background. So, just don't chain up.
*/
}
#if 0
/* This is adapted from code that was commented out in na-tray-manager.c; the
* code in na-tray-manager.c wouldn't have worked reliably, this will. So maybe
* it can be reenabled. On other hand, things seem to be working fine without
* it.
*
* If reenabling, you need to hook it up in na_tray_child_class_init().
*/
static void
na_tray_child_size_request (GtkWidget *widget,
GtkRequisition *request)
{
GTK_WIDGET_CLASS (na_tray_child_parent_class)->size_request (widget, request);
/*
* Make sure the icons have a meaningful size ..
*/
if ((request->width < 16) || (request->height < 16))
{
gint nw = MAX (24, request->width);
gint nh = MAX (24, request->height);
g_warning ("Tray icon has requested a size of (%ix%i), resizing to (%ix%i)",
req.width, req.height, nw, nh);
request->width = nw;
request->height = nh;
}
}
#endif
static void
na_tray_child_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
NaTrayChild *child = NA_TRAY_CHILD (widget);
GtkAllocation widget_allocation;
gboolean moved, resized;
gtk_widget_get_allocation (widget, &widget_allocation);
moved = (allocation->x != widget_allocation.x ||
allocation->y != widget_allocation.y);
resized = (allocation->width != widget_allocation.width ||
allocation->height != widget_allocation.height);
/* When we are allocating the widget while mapped we need special handling
* for both real and fake transparency.
*
* Real transparency: we need to invalidate and trigger a redraw of the old
* and new areas. (GDK really should handle this for us, but doesn't as of
* GTK+-2.14)
*
* Fake transparency: if the widget moved, we need to force the contents to
* be redrawn with the new offset for the parent-relative background.
*/
if ((moved || resized) && gtk_widget_get_mapped (widget))
{
if (na_tray_child_has_alpha (child))
gdk_window_invalidate_rect (gdk_window_get_parent (gtk_widget_get_window (widget)),
&widget_allocation, FALSE);
}
GTK_WIDGET_CLASS (na_tray_child_parent_class)->size_allocate (widget,
allocation);
if ((moved || resized) && gtk_widget_get_mapped (widget))
{
if (na_tray_child_has_alpha (NA_TRAY_CHILD (widget)))
gdk_window_invalidate_rect (gdk_window_get_parent (gtk_widget_get_window (widget)),
&widget_allocation, FALSE);
else if (moved && child->parent_relative_bg)
na_tray_child_force_redraw (child);
}
}
/* The plug window should completely occupy the area of the child, so we won't
* get a draw event. But in case we do (the plug unmaps itself, say), this
* draw handler draws with real or fake transparency.
*/
static gboolean
na_tray_child_draw (GtkWidget *widget,
cairo_t *cr)
{
NaTrayChild *child = NA_TRAY_CHILD (widget);
if (na_tray_child_has_alpha (child))
{
/* Clear to transparent */
cairo_set_source_rgba (cr, 0, 0, 0, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
cairo_paint (cr);
}
else if (child->parent_relative_bg)
{
GdkWindow *window;
cairo_surface_t *target;
GdkRectangle clip_rect;
window = gtk_widget_get_window (widget);
target = cairo_get_group_target (cr);
gdk_cairo_get_clip_rectangle (cr, &clip_rect);
/* Clear to parent-relative pixmap
* We need to use direct X access here because GDK doesn't know about
* the parent relative pixmap. */
cairo_surface_flush (target);
XClearArea (GDK_WINDOW_XDISPLAY (window),
GDK_WINDOW_XID (window),
clip_rect.x, clip_rect.y,
clip_rect.width, clip_rect.height,
False);
cairo_surface_mark_dirty_rectangle (target,
clip_rect.x, clip_rect.y,
clip_rect.width, clip_rect.height);
}
return FALSE;
}
static void
na_tray_child_init (NaTrayChild *child)
{
}
static void
na_tray_child_class_init (NaTrayChildClass *klass)
{
GObjectClass *gobject_class;
GtkWidgetClass *widget_class;
gobject_class = (GObjectClass *)klass;
widget_class = (GtkWidgetClass *)klass;
gobject_class->finalize = na_tray_child_finalize;
widget_class->style_set = na_tray_child_style_set;
widget_class->realize = na_tray_child_realize;
widget_class->size_allocate = na_tray_child_size_allocate;
widget_class->draw = na_tray_child_draw;
}
GtkWidget *
na_tray_child_new (GdkScreen *screen,
Window icon_window)
{
XWindowAttributes window_attributes;
Display *xdisplay;
NaTrayChild *child;
GdkVisual *visual;
gboolean visual_has_alpha;
int red_prec, green_prec, blue_prec, depth;
int result;
g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);
g_return_val_if_fail (icon_window != None, NULL);
xdisplay = GDK_SCREEN_XDISPLAY (screen);
/* We need to determine the visual of the window we are embedding and create
* the socket in the same visual.
*/
gdk_error_trap_push ();
result = XGetWindowAttributes (xdisplay, icon_window,
&window_attributes);
gdk_error_trap_pop_ignored ();
if (!result) /* Window already gone */
return NULL;
visual = gdk_x11_screen_lookup_visual (screen,
window_attributes.visual->visualid);
if (!visual) /* Icon window is on another screen? */
return NULL;
child = g_object_new (NA_TYPE_TRAY_CHILD, NULL);
child->icon_window = icon_window;
gtk_widget_set_visual (GTK_WIDGET (child), visual);
/* We have alpha if the visual has something other than red, green,
* and blue */
gdk_visual_get_red_pixel_details (visual, NULL, NULL, &red_prec);
gdk_visual_get_green_pixel_details (visual, NULL, NULL, &green_prec);
gdk_visual_get_blue_pixel_details (visual, NULL, NULL, &blue_prec);
depth = gdk_visual_get_depth (visual);
visual_has_alpha = red_prec + blue_prec + green_prec < depth;
child->has_alpha = (visual_has_alpha &&
gdk_display_supports_composite (gdk_screen_get_display (screen)));
child->composited = child->has_alpha;
return GTK_WIDGET (child);
}
char *
na_tray_child_get_title (NaTrayChild *child)
{
char *retval = NULL;
GdkDisplay *display;
Atom utf8_string, atom, type;
int result;
int format;
gulong nitems;
gulong bytes_after;
gchar *val;
g_return_val_if_fail (NA_IS_TRAY_CHILD (child), NULL);
display = gtk_widget_get_display (GTK_WIDGET (child));
utf8_string = gdk_x11_get_xatom_by_name_for_display (display, "UTF8_STRING");
atom = gdk_x11_get_xatom_by_name_for_display (display, "_NET_WM_NAME");
gdk_error_trap_push ();
result = XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display),
child->icon_window,
atom,
0, G_MAXLONG,
False, utf8_string,
&type, &format, &nitems,
&bytes_after, (guchar **)&val);
if (gdk_error_trap_pop () || result != Success)
return NULL;
if (type != utf8_string ||
format != 8 ||
nitems == 0)
{
if (val)
XFree (val);
return NULL;
}
if (!g_utf8_validate (val, nitems, NULL))
{
XFree (val);
return NULL;
}
retval = g_strndup (val, nitems);
XFree (val);
return retval;
}
/**
* na_tray_child_has_alpha;
* @child: a #NaTrayChild
*
* Checks if the child has an ARGB visual and real alpha transparence.
* (as opposed to faked alpha transparency with an parent-relative
* background)
*
* Return value: %TRUE if the child has an alpha transparency
*/
gboolean
na_tray_child_has_alpha (NaTrayChild *child)
{
g_return_val_if_fail (NA_IS_TRAY_CHILD (child), FALSE);
return child->has_alpha;
}
/**
* na_tray_child_set_composited;
* @child: a #NaTrayChild
* @composited: %TRUE if the child's window should be redirected
*
* Sets whether the #GdkWindow of the child should be set redirected
* using gdk_window_set_composited(). By default this is based off of
* na_tray_child_has_alpha(), but it may be useful to override it in
* certain circumstances; for example, if the #NaTrayChild is added
* to a parent window and that parent window is composited against the
* background.
*/
void
na_tray_child_set_composited (NaTrayChild *child,
gboolean composited)
{
g_return_if_fail (NA_IS_TRAY_CHILD (child));
if (child->composited == composited)
return;
child->composited = composited;
if (gtk_widget_get_realized (GTK_WIDGET (child)))
gdk_window_set_composited (gtk_widget_get_window (GTK_WIDGET (child)),
composited);
}
/* If we are faking transparency with a window-relative background, force a
* redraw of the icon. This should be called if the background changes or if
* the child is shifted with respect to the background.
*/
void
na_tray_child_force_redraw (NaTrayChild *child)
{
GtkWidget *widget = GTK_WIDGET (child);
if (gtk_widget_get_mapped (widget) && child->parent_relative_bg)
{
#if 1
/* Sending an ExposeEvent might cause redraw problems if the
* icon is expecting the server to clear-to-background before
* the redraw. It should be ok for GtkStatusIcon or EggTrayIcon.
*/
Display *xdisplay = GDK_DISPLAY_XDISPLAY (gtk_widget_get_display (widget));
XEvent xev;
GdkWindow *plug_window;
GtkAllocation allocation;
plug_window = gtk_socket_get_plug_window (GTK_SOCKET (child));
gtk_widget_get_allocation (widget, &allocation);
xev.xexpose.type = Expose;
xev.xexpose.window = GDK_WINDOW_XID (plug_window);
xev.xexpose.x = 0;
xev.xexpose.y = 0;
xev.xexpose.width = allocation.width;
xev.xexpose.height = allocation.height;
xev.xexpose.count = 0;
gdk_error_trap_push ();
XSendEvent (xdisplay,
xev.xexpose.window,
False, ExposureMask,
&xev);
gdk_error_trap_pop_ignored ();
#else
/* Hiding and showing is the safe way to do it, but can result in more
* flickering.
*/
gdk_window_hide (widget->window);
gdk_window_show (widget->window);
#endif
}
}
/* from libwnck/xutils.c, comes as LGPLv2+ */
static char *
latin1_to_utf8 (const char *latin1)
{
GString *str;
const char *p;
str = g_string_new (NULL);
p = latin1;
while (*p)
{
g_string_append_unichar (str, (gunichar) *p);
++p;
}
return g_string_free (str, FALSE);
}
/* derived from libwnck/xutils.c, comes as LGPLv2+ */
static void
_get_wmclass (Display *xdisplay,
Window xwindow,
char **res_class,
char **res_name)
{
XClassHint ch;
ch.res_name = NULL;
ch.res_class = NULL;
gdk_error_trap_push ();
XGetClassHint (xdisplay, xwindow, &ch);
gdk_error_trap_pop_ignored ();
if (res_class)
*res_class = NULL;
if (res_name)
*res_name = NULL;
if (ch.res_name)
{
if (res_name)
*res_name = latin1_to_utf8 (ch.res_name);
XFree (ch.res_name);
}
if (ch.res_class)
{
if (res_class)
*res_class = latin1_to_utf8 (ch.res_class);
XFree (ch.res_class);
}
}
/**
* na_tray_child_get_wm_class;
* @child: a #NaTrayChild
* @res_name: return location for a string containing the application name of
* @child, or %NULL
* @res_class: return location for a string containing the application class of
* @child, or %NULL
*
* Fetches the resource associated with @child.
*/
void
na_tray_child_get_wm_class (NaTrayChild *child,
char **res_name,
char **res_class)
{
GdkDisplay *display;
g_return_if_fail (NA_IS_TRAY_CHILD (child));
display = gtk_widget_get_display (GTK_WIDGET (child));
_get_wmclass (GDK_DISPLAY_XDISPLAY (display),
child->icon_window,
res_class,
res_name);
}
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