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testcairo: Connect to draw signal

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This commit is contained in:
Benjamin Otte 2010-09-08 22:12:51 +02:00
parent eed9468e06
commit 9c980372d2
1 changed files with 8 additions and 28 deletions
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36
tests/testcairo.c
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@ -115,15 +115,17 @@ draw_3circles (cairo_t *cr,
cairo_fill (cr);
}
static void
draw (cairo_t *cr,
int width,
int height)
static gboolean
on_draw (GtkWidget *widget,
cairo_t *cr)
{
cairo_surface_t *overlay, *punch, *circles;
cairo_t *overlay_cr, *punch_cr, *circles_cr;
int width, height;
/* Fill the background */
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
double radius = 0.5 * (width < height ? width : height) - 10;
double xc = width / 2.;
double yc = height / 2.;
@ -131,20 +133,14 @@ draw (cairo_t *cr,
overlay = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_COLOR_ALPHA,
width, height);
if (overlay == NULL)
return;
punch = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_ALPHA,
width, height);
if (punch == NULL)
return;
circles = cairo_surface_create_similar (cairo_get_target (cr),
CAIRO_CONTENT_COLOR_ALPHA,
width, height);
if (circles == NULL)
return;
fill_checks (cr, 0, 0, width, height);
@ -188,22 +184,6 @@ draw (cairo_t *cr,
cairo_surface_destroy (overlay);
cairo_surface_destroy (punch);
cairo_surface_destroy (circles);
}
static gboolean
on_expose_event (GtkWidget *widget,
GdkEventExpose *event,
gpointer data)
{
GtkAllocation allocation;
cairo_t *cr;
cr = gdk_cairo_create (gtk_widget_get_window (widget));
gtk_widget_get_allocation (widget, &allocation);
draw (cr, allocation.width, allocation.height);
cairo_destroy (cr);
return FALSE;
}
@ -223,8 +203,8 @@ main (int argc, char **argv)
darea = gtk_drawing_area_new ();
gtk_container_add (GTK_CONTAINER (window), darea);
g_signal_connect (darea, "expose-event",
G_CALLBACK (on_expose_event), NULL);
g_signal_connect (darea, "draw",
G_CALLBACK (on_draw), NULL);
g_signal_connect (window, "destroy-event",
G_CALLBACK (gtk_main_quit), NULL);