I'm trying to set a custom background for a GtkEntry (as a temporary
thing, by way of an alert for invalid input). I can do that fine for
gtk 2 using gtk_widget_modify_base(), but am struggling with gtk 3.
Here's what I've come up with so far (omitting error checking and
clean-up for brevity). It doesn't work, no red background appears. Any
suggestions gratefully received.
void entry_alert (GtkWidget *entry)
{
GtkStyleContext *context;
PangoLayout *layout;
PangoRectangle r;
GdkWindow *win;
cairo_surface_t *cs;
cairo_t *cr;
gtk_widget_grab_focus(entry);
gtk_editable_select_region(GTK_EDITABLE(entry), 0, -1);
layout = gtk_entry_get_layout(GTK_ENTRY(entry));
pango_layout_get_pixel_extents(layout, &r, NULL);
win = gtk_widget_get_window(entry);
cs = gdk_window_create_similar_surface(win,
CAIRO_CONTENT_COLOR,
r.width,
r.height);
cr = cairo_create(cs);
cairo_set_source_rgb(cr, 1.0, 0.0, 0.0); /* red */
cairo_paint(cr);
context = gtk_widget_get_style_context(entry);
gtk_render_background(context, cr, r.x, r.y, r.width, r.height);
}
--
Allin Cottrell
Department of Economics
Wake Forest University, NC
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