Mouse: Implement `click`

Method that clicks the mouse.

* Add `_cursor_position` instance var that describes the current cursor
  position after the `moveToPoint` method is called
* `click` will click at the `_cursor_position` point
* I had extracted the centering code to `centerPoint` (which maybe
  should have been called `pointAtCenter`) out of the `moveToCenter`
  method because I briefly used it in `click` as a test before adding
  the `_cursor_position` ivar. This should be reintegrated with
  `moveToCenter`.
* Add a `post_mouse_event` function that abstracts the CG calls needed
  to send a mouse event since we need both click down and up events.

Based on:
http://stackoverflow.com/questions/1483657/performing-a-double-click-using-cgeventcreatemouseevent

3 files changed, 27 insertions, 6 deletions

diff --git a/Low Battery Yup d/AppDelegate.m b/Low Battery Yup d/AppDelegate.m
index d599f8a..887d794 100644
--- a/Low Battery Yup d/AppDelegate.m
+++ b/Low Battery Yup d/AppDelegate.m
@@ -20,6 +20,7 @@
 {
 	Mouse *m = [[Mouse alloc] init];
 	[m moveToCenter];
+	[m click];
 }
 
 @end
diff --git a/Low Battery Yup d/Mouse.h b/Low Battery Yup d/Mouse.h
index 950f9c1..d34e715 100644
--- a/Low Battery Yup d/Mouse.h
+++ b/Low Battery Yup d/Mouse.h
@@ -10,8 +10,10 @@
 
 @interface Mouse : NSObject {
 	CGDirectDisplayID _current_display;
+	CGPoint _cursor_position;
 }
 
+- (CGPoint)centerPoint;
 - (void)moveToPoint:(CGPoint)point;
 - (void)moveToCenter;
 - (void)click;
diff --git a/Low Battery Yup d/Mouse.m b/Low Battery Yup d/Mouse.m
index ead9010..91ddce4 100644
--- a/Low Battery Yup d/Mouse.m
+++ b/Low Battery Yup d/Mouse.m
@@ -15,16 +15,12 @@
     self = [super init];
     if (self) {
         _current_display = CGMainDisplayID();
+		_cursor_position = CGPointMake(0, 0);
     }
     return self;
 }
 
-- (void)moveToPoint:(CGPoint)point
-{
-	CGDisplayMoveCursorToPoint(_current_display, point);
-}
-
-- (void)moveToCenter
+- (CGPoint)centerPoint
 {
 	CGPoint point;
 
@@ -34,11 +30,33 @@
 	point.x = width / 2;
 	point.y = height / 2;
 
+	return point;
+}
+
+- (void)moveToPoint:(CGPoint)point
+{
+	_cursor_position = point;
+	CGDisplayMoveCursorToPoint(_current_display, point);
+}
+
+- (void)moveToCenter
+{
+	CGPoint point = [self centerPoint];
 	[self moveToPoint:point];
 }
 
+void post_mouse_event (CGEventType type, CGMouseButton button, CGPoint point) {
+	CGEventSourceRef ref = CGEventSourceCreate(kCGEventSourceStatePrivate);
+	CGEventRef event = CGEventCreateMouseEvent(ref, type, point, button);
+	CGEventPost(kCGHIDEventTap, event);
+	CFRelease(event);
+	CFRelease(ref);
+}
+
 - (void)click
 {
+	post_mouse_event(kCGEventLeftMouseDown, kCGMouseButtonLeft, _cursor_position);
+	post_mouse_event(kCGEventLeftMouseUp, kCGMouseButtonLeft, _cursor_position);
 }
 
 @end