Implement three-finger tap and drag gestures

[libs/gui.git] / source / input / gesturedetector.h

diff --git a/source/input/gesturedetector.h b/source/input/gesturedetector.h
index 2b5ea3c3203219d2153b78cd22e19c65aed3d291..51af312720c17da85a4f49692a6116c9022ab5bf 100644 (file)
--- a/source/input/gesturedetector.h
+++ b/source/input/gesturedetector.h
@@ -11,22 +11,30 @@ class Touchscreen;
 enum Gesture
 {
        GESTURE_NONE,
-       GESTURE_SWIPE_DOWN,
-       GESTURE_SWIPE_UP,
-       GESTURE_SWIPE_LEFT,
-       GESTURE_SWIPE_RIGHT,
-       GESTURE_PINCH
+       GESTURE_TAP,
+       GESTURE_TAP_2,
+       GESTURE_TAP_3,
+       GESTURE_DRAG,
+       GESTURE_DRAG_2,
+       GESTURE_DRAG_3,
+       GESTURE_PINCH,
+       GESTURE_ROTATE
 };
 
 /**
 Interprets events from a Touchscreen as high-level gestures.  One button is
 provided for each type of gesture.  Axes 0 and 1 indicate the starting position
-of the gesture; axis 2 tracks its progress.  The progress axis may exhibit
+of the gesture; axes 2 and 3 track its progress.  The progress axis may exhibit
 absolute values greater than one.
 */
 class GestureDetector: public Device
 {
 private:
+       enum
+       {
+               MAX_POINTS = 3
+       };
+
        struct TouchPoint
        {
                bool down;
@@ -34,14 +42,15 @@ private:
                float down_y;
                float x;
                float y;
+               bool threshold_exceeded;
 
                TouchPoint();
        };
 
        Touchscreen &touchscreen;
-       TouchPoint points[3];
+       TouchPoint points[MAX_POINTS];
        Gesture current_gesture;
-       unsigned active_points;
+       Gesture pending_tap;
        bool invalid_gesture;
        float threshold_x_sq;
        float threshold_y_sq;
@@ -57,10 +66,16 @@ private:
        void touch_up(unsigned);
        void touch_move(unsigned, float, float);
        void start_gesture();
+       void set_gesture_location(unsigned);
+       void set_gesture_delta(unsigned);
        void update_progress();
+       void end_gesture();
        void window_resized(unsigned, unsigned);
 };
 
+
+unsigned gesture_points(Gesture);
+
 } // namespace Input
 } // namespace Msp