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Diffstat (limited to 'src/tray/na-tray-child.c')
| -rw-r--r-- | src/tray/na-tray-child.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/src/tray/na-tray-child.c b/src/tray/na-tray-child.c new file mode 100644 index 0000000..175ac8a --- /dev/null +++ b/src/tray/na-tray-child.c @@ -0,0 +1,504 @@ +/* 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); +G_GNUC_BEGIN_IGNORE_DEPRECATIONS + gdk_window_set_background_pattern (window, transparent); +G_GNUC_END_IGNORE_DEPRECATIONS + 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. */ +G_GNUC_BEGIN_IGNORE_DEPRECATIONS + gdk_window_set_background_pattern (window, NULL); +G_GNUC_END_IGNORE_DEPRECATIONS + + 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; + } + + 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. + * The function is deprecated because it is only meaningful on X11 - the + * same is true for XEmbed of course, so just ignore the warning. + */ +G_GNUC_BEGIN_IGNORE_DEPRECATIONS + gtk_widget_set_double_buffered (GTK_WIDGET (child), + child->parent_relative_bg); +G_GNUC_END_IGNORE_DEPRECATIONS +} + +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 re-enabled. 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; + GdkDisplay *display; + 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); + display = gdk_x11_lookup_xdisplay (xdisplay); + + /* We need to determine the visual of the window we are embedding and create + * the socket in the same visual. + */ + + gdk_x11_display_error_trap_push (display); + result = XGetWindowAttributes (xdisplay, icon_window, + &window_attributes); + gdk_x11_display_error_trap_pop_ignored (display); + + 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; + + 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_x11_display_error_trap_push (display); + + 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_x11_display_error_trap_pop (display) || 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; +} + +/* 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. + */ + GdkDisplay *display = gtk_widget_get_display (widget); + Display *xdisplay = GDK_DISPLAY_XDISPLAY (display); + 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_x11_display_error_trap_push (display); + XSendEvent (xdisplay, + xev.xexpose.window, + False, ExposureMask, + &xev); + gdk_x11_display_error_trap_pop_ignored (display); +#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) +{ + GdkDisplay *display; + XClassHint ch; + + ch.res_name = NULL; + ch.res_class = NULL; + + display = gdk_x11_lookup_xdisplay (xdisplay); + gdk_x11_display_error_trap_push (display); + XGetClassHint (xdisplay, xwindow, &ch); + gdk_x11_display_error_trap_pop_ignored (display); + + 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); +} |