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testgtk: Connect to draw signals in "composited window" example

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This commit is contained in:
Benjamin Otte 2010-09-08 22:31:06 +02:00
parent ec604d11ec
commit 7af767333e
1 changed files with 10 additions and 30 deletions
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40
tests/testgtk.c
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@ -335,7 +335,7 @@ create_alpha_window (GtkWidget *widget)
* Composited non-toplevel window
*/
/* The expose event handler for the event box.
/* The draw event handler for the event box.
*
* This function simply draws a transparency onto a widget on the area
* for which it receives expose events. This is intended to give the
@ -348,16 +348,11 @@ create_alpha_window (GtkWidget *widget)
* default background colour).
*/
static gboolean
transparent_expose (GtkWidget *widget,
GdkEventExpose *event)
transparent_draw (GtkWidget *widget,
cairo_t *cr)
{
cairo_t *cr;
cr = gdk_cairo_create (gtk_widget_get_window (widget));
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
gdk_cairo_region (cr, event->region);
cairo_fill (cr);
cairo_destroy (cr);
cairo_paint (cr);
return FALSE;
}
@ -374,20 +369,15 @@ transparent_expose (GtkWidget *widget,
* called before then GTK would just blindly paint over our work.
*/
static gboolean
window_expose_event (GtkWidget *widget,
GdkEventExpose *event)
window_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkAllocation allocation;
cairo_region_t *region;
GtkWidget *child;
cairo_t *cr;
/* get our child (in this case, the event box) */
child = gtk_bin_get_child (GTK_BIN (widget));
/* create a cairo context to draw to the window */
cr = gdk_cairo_create (gtk_widget_get_window (widget));
gtk_widget_get_allocation (child, &allocation);
/* the source data is the (composited) event box */
@ -395,19 +385,9 @@ window_expose_event (GtkWidget *widget,
allocation.x,
allocation.y);
/* draw no more than our expose event intersects our child */
region = cairo_region_create_rectangle (&allocation);
cairo_region_intersect (region, event->region);
gdk_cairo_region (cr, region);
cairo_clip (cr);
/* composite, with a 50% opacity */
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_paint_with_alpha (cr, 0.5);
/* we're done */
cairo_destroy (cr);
return FALSE;
}
@ -439,8 +419,8 @@ create_composited_window (GtkWidget *widget)
* that "transparency" is the background colour for a widget.
*/
gtk_widget_set_app_paintable (GTK_WIDGET (event), TRUE);
g_signal_connect (event, "expose-event",
G_CALLBACK (transparent_expose), NULL);
g_signal_connect (event, "draw",
G_CALLBACK (transparent_draw), NULL);
/* put them inside one another */
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
@ -460,8 +440,8 @@ create_composited_window (GtkWidget *widget)
* note that we do _after so that the normal (red) background is drawn
* by gtk before our compositing occurs.
*/
g_signal_connect_after (window, "expose-event",
G_CALLBACK (window_expose_event), NULL);
g_signal_connect_after (window, "draw",
G_CALLBACK (window_draw), NULL);
}
if (!gtk_widget_get_visible (window))