Implement AbsoluteTouchHandler

Limelight/Input/AbsoluteTouchHandler.m

@@ -8,8 +8,28 @@
 
 #import "AbsoluteTouchHandler.h"
 
+#include <Limelight.h>
+
+// How long the fingers must be stationary to start a right click
+#define LONG_PRESS_ACTIVATION_DELAY 0.650f
+
+// How far the finger can move before it cancels a right click
+#define LONG_PRESS_ACTIVATION_DELTA 5
+
+// How long the double tap deadzone stays in effect between touch up and touch down
+#define DOUBLE_TAP_DEAD_ZONE_DELAY 0.250f
+
+// How far the finger can move before it can override the double tap deadzone
+#define DOUBLE_TAP_DEAD_ZONE_DELTA 10
+
 @implementation AbsoluteTouchHandler {
     StreamView* view;
+    
+    NSTimer* longPressTimer;
+    UITouch* lastTouchDown;
+    CGPoint lastTouchDownLocation;
+    UITouch* lastTouchUp;
+    CGPoint lastTouchUpLocation;
 }
 
 - (id)initWithView:(StreamView*)view {
@@ -18,16 +38,83 @@
     return self;
 }
 
+- (void)onLongPressStart:(NSTimer*)timer {
+    // Raise the left click and start a right click
+    LiSendMouseButtonEvent(BUTTON_ACTION_RELEASE, BUTTON_LEFT);
+    LiSendMouseButtonEvent(BUTTON_ACTION_PRESS, BUTTON_RIGHT);
+}
+
 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
+    // Ignore touch down events with more than one finger
+    if ([[event allTouches] count] > 1) {
+        return;
+    }
+    
+    UITouch* touch = [touches anyObject];
+    CGPoint touchLocation = [touch locationInView:view];
+    
+    // Don't reposition for finger down events within the deadzone. This makes double-clicking easier.
+    if (touch.timestamp - lastTouchUp.timestamp > DOUBLE_TAP_DEAD_ZONE_DELAY ||
+        sqrt(pow(touchLocation.x - lastTouchUpLocation.x, 2) +
+             pow(touchLocation.y - lastTouchUpLocation.y, 2)) > DOUBLE_TAP_DEAD_ZONE_DELTA) {
+        [view updateCursorLocation:touchLocation];
+    }
+    
+    // Press the left button down
+    LiSendMouseButtonEvent(BUTTON_ACTION_PRESS, BUTTON_LEFT);
+    
+    // Start the long press timer
+    longPressTimer = [NSTimer scheduledTimerWithTimeInterval:LONG_PRESS_ACTIVATION_DELAY
+                                                      target:self
+                                                    selector:@selector(onLongPressStart:)
+                                                    userInfo:nil
+                                                     repeats:NO];
+    
+    lastTouchDown = touch;
+    lastTouchDownLocation = touchLocation;
 }
 
 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
+    // Ignore touch move events with more than one finger
+    if ([[event allTouches] count] > 1) {
+        return;
+    }
+    
+    UITouch* touch = [touches anyObject];
+    CGPoint touchLocation = [touch locationInView:view];
+    
+    if (sqrt(pow(touchLocation.x - lastTouchDownLocation.x, 2) +
+             pow(touchLocation.y - lastTouchDownLocation.y, 2)) > LONG_PRESS_ACTIVATION_DELTA) {
+        // Moved too far since touch down. Cancel the long press timer.
+        [longPressTimer invalidate];
+        longPressTimer = nil;
+    }
+    
+    [view updateCursorLocation:[[touches anyObject] locationInView:view]];
 }
 
 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
+    // Only fire this logic if all touches have ended
+    if ([[event allTouches] count] == [touches count]) {
+        // Cancel the long press timer
+        [longPressTimer invalidate];
+        longPressTimer = nil;
+
+        // Left button up on finger up
+        LiSendMouseButtonEvent(BUTTON_ACTION_RELEASE, BUTTON_LEFT);
+
+        // Raise right button too in case we triggered a long press gesture
+        LiSendMouseButtonEvent(BUTTON_ACTION_RELEASE, BUTTON_RIGHT);
+        
+        // Remember this last touch for touch-down deadzoning
+        lastTouchUp = [touches anyObject];
+        lastTouchUpLocation = [lastTouchUp locationInView:view];
+    }
 }
 
 - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
+    // Treat this as a normal touchesEnded event
+    [self touchesEnded:touches withEvent:event];
 }
 
 @end