Re: How to get a transparent GtkWindow (fremantle)

[Luca Donaggio]

Hi Kimmo,

I'm sorry to bother you again, but the problem I'm facing is not how to get
a transparent window, but that if I create such a window the HildonAppMenu
of its parent HildonWindow doesn't show anymore.
I (slightly) modified your code to exemplify my situation.


Thanks for your time,

Luca Donaggio

2009/11/10 Kimmo Hämäläinen <kimmo.hamalai...@nokia.com>

> Hi,
>
> Sorry, took some time, I was busy with some bug fixing...  I started
> with the Home applet example and managed to whip up a small example
> (attached) that shows a transparent pop-up window.
>
> -Kimmo
>
>

/*
 gcc -Wall `pkg-config gtk+-2.0 hildon-1 --cflags --libs` rgba-window-example-1.c -o rgba-window-example-1
 */

#include <gtk/gtk.h>
#include <hildon/hildon.h>

static gboolean
handle_expose (GtkWidget *widget, GdkEventExpose *event)
{
  cairo_t *cr;

  /* Create cairo context */
  cr = gdk_cairo_create (GDK_DRAWABLE (widget->window));
  gdk_cairo_region (cr, event->region);
  cairo_clip (cr);

  /* Draw alpha background */
  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
  cairo_set_source_rgba (cr, 0.5, 0.5, 0.5, 0.5);
  cairo_paint (cr);

  /* Free context */
  cairo_destroy (cr);

  return FALSE;
}

int main ()
{
  HildonProgram *prog;
  HildonWindow *mainwin;
  GtkWidget *win, *label1, *label2;
  GdkScreen *screen;
  HildonAppMenu *menu;
  GtkWidget *button;

  hildon_gtk_init (NULL, NULL);

  prog = HILDON_PROGRAM (hildon_program_get_instance ());
  mainwin = HILDON_WINDOW (hildon_window_new ());
  hildon_program_add_window (prog, mainwin);

  menu = HILDON_APP_MENU (hildon_app_menu_new ());
  button = gtk_button_new_with_label ("Quit");
  g_signal_connect_after (button, "clicked", G_CALLBACK (gtk_main_quit), NULL);
  hildon_app_menu_append (menu, GTK_BUTTON (button));
  gtk_widget_show_all (GTK_WIDGET (menu));
  hildon_window_set_app_menu (mainwin, menu);

  label2 = gtk_label_new ("This is the main Hildon window\nThis is the main Hildon window\nThis is the main Hildon window\nThis is the main Hildon window");
  gtk_container_add (GTK_CONTAINER (mainwin), label2);
  gtk_widget_show_all (GTK_WIDGET (mainwin));

  win = gtk_window_new (GTK_WINDOW_POPUP);
  screen = gtk_widget_get_screen (win);
  gtk_widget_set_colormap (win, gdk_screen_get_rgba_colormap (screen));
  gtk_widget_set_app_paintable (win, TRUE);

  gtk_widget_realize (win);
  gdk_window_set_back_pixmap (win->window, NULL, FALSE);
  gtk_window_set_transient_for (GTK_WINDOW (win), GTK_WINDOW (mainwin));
  gtk_window_set_destroy_with_parent (GTK_WINDOW (win), TRUE);
  gtk_window_move (GTK_WINDOW (win), 300, 200);

  label1 = gtk_label_new ("This is an RGBA window");
  gtk_container_add (GTK_CONTAINER (win), label1);

  gtk_widget_show_all (win);

  g_signal_connect (win, "expose-event", G_CALLBACK (handle_expose), win);
  gtk_main ();
  return 0;
}


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