prolooks/CustomWidget.vala

   1 using Gtk;
   2 using Gdk;
   3
   4 // template for new widgets
   5
   6 namespace Prolooks {
   7
   8 public class CustomWidget : DrawingArea {
   9
  10     public CustomWidget () {
  11
  12         // Enable the events you wish to get notified about.
  13         // The 'expose' event is already enabled by the DrawingArea.
  14         add_events (Gdk.EventMask.BUTTON_PRESS_MASK
  15                   | Gdk.EventMask.BUTTON_RELEASE_MASK
  16                   | Gdk.EventMask.POINTER_MOTION_MASK);
  17
  18         // Set favored widget size
  19         set_size_request (100, 100);
  20     }
  21
  22     /* Widget is asked to draw itself */
  23     public override bool expose_event (Gdk.EventExpose event) {
  24
  25         // Create a Cairo context
  26         var cr = Gdk.cairo_create (this.window);
  27
  28         // Set clipping area in order to avoid unnecessary drawing
  29         cr.rectangle (event.area.x, event.area.y,
  30                       event.area.width, event.area.height);
  31         cr.clip ();
  32
  33         // ...
  34
  35         return false;
  36     }
  37
  38     /* Mouse button got pressed over widget */
  39     public override bool button_press_event (Gdk.EventButton event) {
  40         // ...
  41         return false;
  42     }
  43
  44     /* Mouse button got released */
  45     public override bool button_release_event (Gdk.EventButton event) {
  46         // ...
  47         return false;
  48     }
  49
  50     /* Mouse pointer moved over widget */
  51     public override bool motion_notify_event (Gdk.EventMotion event) {
  52         // ...
  53         return false;
  54     }
  55
  56             static int main (string[] args) {
  57             Gtk.init (ref args);
  58             var window = new Gtk.Window (Gtk.WindowType.TOPLEVEL);
  59             var widget = new CustomWidget ();
  60             window.add (widget);
  61             window.destroy += Gtk.main_quit;
  62             window.show_all ();
  63             Gtk.main ();
  64             return 0;
  65         }
  66 }
  67
  68 } // namespace Prolooks