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    <p>I changed the <a href="http://plan99.net/~mike/files/alphademo.c" rel="noreferrer">alphademo</a> example to draw a button instead of the red circle.</p> <p>This application draws the button on a 400x400 transparent window. </p> <p>When you click on the window the application shows/hides the title bar.</p> <pre><code>#include &lt;gtk/gtk.h&gt; #include &lt;gdk/gdkscreen.h&gt; #include &lt;cairo.h&gt; static void screen_changed(GtkWidget *widget, GdkScreen *old_screen, gpointer user_data); static gboolean expose(GtkWidget *widget, GdkEventExpose *event, gpointer user_data); static void clicked(GtkWindow *win, GdkEventButton *event, gpointer user_data); int main(int argc, char **argv) { gtk_init(&amp;argc, &amp;argv); GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER); gtk_window_set_default_size(GTK_WINDOW(window), 400, 400); gtk_window_set_title(GTK_WINDOW(window), "Alpha Demo"); g_signal_connect(G_OBJECT(window), "delete-event", gtk_main_quit, NULL); gtk_widget_set_app_paintable(window, TRUE); g_signal_connect(G_OBJECT(window), "expose-event", G_CALLBACK(expose), NULL); g_signal_connect(G_OBJECT(window), "screen-changed", G_CALLBACK(screen_changed), NULL); gtk_window_set_decorated(GTK_WINDOW(window), FALSE); gtk_widget_add_events(window, GDK_BUTTON_PRESS_MASK); g_signal_connect(G_OBJECT(window), "button-press-event", G_CALLBACK(clicked), NULL); GtkWidget* fixed_container = gtk_fixed_new(); gtk_container_add(GTK_CONTAINER(window), fixed_container); GtkWidget* button = gtk_button_new_with_label("button1"); gtk_widget_set_size_request(button, 100, 100); gtk_container_add(GTK_CONTAINER(fixed_container), button); screen_changed(window, NULL, NULL); gtk_widget_show_all(window); gtk_main(); return 0; } gboolean supports_alpha = FALSE; static void screen_changed(GtkWidget *widget, GdkScreen *old_screen, gpointer userdata) { /* To check if the display supports alpha channels, get the colormap */ GdkScreen *screen = gtk_widget_get_screen(widget); GdkColormap *colormap = gdk_screen_get_rgba_colormap(screen); if (!colormap) { printf("Your screen does not support alpha channels!\n"); colormap = gdk_screen_get_rgb_colormap(screen); supports_alpha = FALSE; } else { printf("Your screen supports alpha channels!\n"); supports_alpha = TRUE; } gtk_widget_set_colormap(widget, colormap); } static gboolean expose(GtkWidget *widget, GdkEventExpose *event, gpointer userdata) { cairo_t *cr = gdk_cairo_create(widget-&gt;window); if (supports_alpha) cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */ else cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* opaque white */ /* draw the background */ cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE); cairo_paint (cr); cairo_destroy(cr); return FALSE; } static void clicked(GtkWindow *win, GdkEventButton *event, gpointer user_data) { /* toggle window manager frames */ gtk_window_set_decorated(win, !gtk_window_get_decorated(win)); } </code></pre> <p>Compiled on Ubuntu 10.04:</p> <pre><code>gcc alpha.c -o alpha -I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -lgtk-x11-2.0 </code></pre>
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    1. POHow to make Gtk+ window background transparent?
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    1. CONotice that I add a fixed_container to the window and then attach the button to it.
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    2. COWorks great. I also tried using it with gtk webkit with its background set to transparent, and it worked flawlessly.
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    3. CO@echo-flow: could you please add your gtk-webkit answer with an example? Thanks.
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