[cheese] Shoot when the webcam capture button is pressed

[David King <davidk src gnome org>]

commit 242cc91db549f160f4047ef1bbb26b83ebffd206
Author: David King <amigadave amigadave com>
Date:   Wed Jan 2 19:07:56 2013 +0000

    Shoot when the webcam capture button is pressed
    
    This functionality existed is Cheese 2.32 (it was added in commit
    de0114556cef148c396552d1c189b476ea0c8aab) but was lost in 3.0. Add it
    back to fix bug 690961.

 src/cheese-main.vala |   43 +++++++++++++++++++++++++++++++++++++++----
 1 files changed, 39 insertions(+), 4 deletions(-)
---
diff --git a/src/cheese-main.vala b/src/cheese-main.vala
index 259e554..ac5ba6f 100644
--- a/src/cheese-main.vala
+++ b/src/cheese-main.vala
@@ -129,10 +129,15 @@ public class Cheese.Main : Gtk.Application
       if (fullscreen)
         main_window.set_startup_fullscreen_mode ();
 
-        main_window.show ();
-        setup_camera (device);
-        preferences_dialog = new PreferencesDialog (camera);
-     }
+      /* Shoot when the webcam capture button is pressed. */
+      main_window.add_events (Gdk.EventMask.KEY_PRESS_MASK
+                              | Gdk.EventMask.KEY_RELEASE_MASK);
+      main_window.key_press_event.connect (on_webcam_key_pressed);
+
+      main_window.show ();
+      setup_camera (device);
+      preferences_dialog = new PreferencesDialog (camera);
+    }
   }
 
   /**
@@ -286,6 +291,36 @@ public class Cheese.Main : Gtk.Application
     }
 
     /**
+     * Handle the webcam take photo button being pressed.
+     *
+     * @param event the Gdk.KeyEvent
+     * @return true to stop other handlers being invoked, false to propagate
+     * the event further
+     */
+    private bool on_webcam_key_pressed (Gdk.EventKey event)
+    {
+        /* Ignore the event if any modifier keys are pressed. */
+        if (event.state != 0
+            && ((event.state & Gdk.ModifierType.CONTROL_MASK) != 0
+                 || (event.state & Gdk.ModifierType.MOD1_MASK) != 0
+                 || (event.state & Gdk.ModifierType.MOD3_MASK) != 0
+                 || (event.state & Gdk.ModifierType.MOD4_MASK) != 0
+                 || (event.state & Gdk.ModifierType.MOD5_MASK) != 0))
+        {
+            return false;
+        }
+
+        switch (event.keyval)
+        {
+            case Gdk.Key.WebCam:
+                on_shoot ();
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
      * Handle the camera state changing.
      *
      * @param new_state the new Cheese.Camera state