[CRD iOS] Add support for three-finger gestures

remoting/ios/client_gestures.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "remoting/ios/client_gestures.h"
 
+#import "remoting/ios/app/host_view_controller.h"
 #import "remoting/ios/session/remoting_client.h"
 
 #include "base/logging.h"
 #include "remoting/client/ui/gesture_interpreter.h"
 
 remoting::GestureInterpreter::GestureState toGestureState(
     UIGestureRecognizerState state) {
   switch (state) {
     case UIGestureRecognizerStateBegan:
       return remoting::GestureInterpreter::GESTURE_BEGAN;
     case UIGestureRecognizerStateChanged:
       return remoting::GestureInterpreter::GESTURE_CHANGED;
     default:
       return remoting::GestureInterpreter::GESTURE_ENDED;
   }
 }
 
 @implementation ClientGestures
 
-- (instancetype)initWithView:(UIView*)view client:(RemotingClient*)client {
-  _view = view;
-  _client = client;
+- (instancetype)initWithHostViewController:(HostViewController*)controller {
+  _view = controller.view;
+  _client = controller.client;
+  _controller = controller;
 
   _inputScheme = HostInputSchemeTouch;
 
   _longPressRecognizer = [[UILongPressGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(longPressGestureTriggered:)];
   _longPressRecognizer.delegate = self;
-  [view addGestureRecognizer:_longPressRecognizer];
+  [_view addGestureRecognizer:_longPressRecognizer];
 
   _panRecognizer = [[UIPanGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(panGestureTriggered:)];
   _panRecognizer.minimumNumberOfTouches = 1;
   _panRecognizer.maximumNumberOfTouches = 2;
   _panRecognizer.delegate = self;
-  [view addGestureRecognizer:_panRecognizer];
+  [_view addGestureRecognizer:_panRecognizer];
 
   _flingRecognizer = [[UIPanGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(flingGestureTriggered:)];
   _flingRecognizer.minimumNumberOfTouches = 1;
   _flingRecognizer.maximumNumberOfTouches = 1;
   _flingRecognizer.delegate = self;
-  [view addGestureRecognizer:_flingRecognizer];
+  [_view addGestureRecognizer:_flingRecognizer];
 
   _scrollRecognizer = [[UIPanGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(scrollGestureTriggered:)];
   _scrollRecognizer.minimumNumberOfTouches = 2;
   _scrollRecognizer.maximumNumberOfTouches = 2;
   _scrollRecognizer.delegate = self;
-  [view addGestureRecognizer:_scrollRecognizer];
+  [_view addGestureRecognizer:_scrollRecognizer];
 
   _threeFingerPanRecognizer = [[UIPanGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(threeFingerPanGestureTriggered:)];
   _threeFingerPanRecognizer.minimumNumberOfTouches = 3;
   _threeFingerPanRecognizer.maximumNumberOfTouches = 3;
   _threeFingerPanRecognizer.delegate = self;
-  [view addGestureRecognizer:_threeFingerPanRecognizer];
+  [_view addGestureRecognizer:_threeFingerPanRecognizer];
 
   _pinchRecognizer = [[UIPinchGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(pinchGestureTriggered:)];
   _pinchRecognizer.delegate = self;
-  [view addGestureRecognizer:_pinchRecognizer];
+  [_view addGestureRecognizer:_pinchRecognizer];
 
   _singleTapRecognizer = [[UITapGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(tapGestureTriggered:)];
   _singleTapRecognizer.delegate = self;
-  [view addGestureRecognizer:_singleTapRecognizer];
+  [_view addGestureRecognizer:_singleTapRecognizer];
 
   _twoFingerTapRecognizer = [[UITapGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(twoFingerTapGestureTriggered:)];
   _twoFingerTapRecognizer.numberOfTouchesRequired = 2;
   _twoFingerTapRecognizer.delegate = self;
-  [view addGestureRecognizer:_twoFingerTapRecognizer];
+  [_view addGestureRecognizer:_twoFingerTapRecognizer];
 
   _threeFingerTapRecognizer = [[UITapGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(threeFingerTapGestureTriggered:)];
   _threeFingerTapRecognizer.numberOfTouchesRequired = 3;
   _threeFingerPanRecognizer.delegate = self;
-  [view addGestureRecognizer:_threeFingerTapRecognizer];
+  [_view addGestureRecognizer:_threeFingerTapRecognizer];
 
   _inputScheme = HostInputSchemeTouch;
 
   [_singleTapRecognizer requireGestureRecognizerToFail:_twoFingerTapRecognizer];
   [_twoFingerTapRecognizer
       requireGestureRecognizerToFail:_threeFingerTapRecognizer];
   [_pinchRecognizer requireGestureRecognizerToFail:_singleTapRecognizer];
+  [_pinchRecognizer requireGestureRecognizerToFail:_threeFingerPanRecognizer];
   [_panRecognizer requireGestureRecognizerToFail:_singleTapRecognizer];
   [_threeFingerPanRecognizer
       requireGestureRecognizerToFail:_threeFingerTapRecognizer];
   [_panRecognizer requireGestureRecognizerToFail:_scrollRecognizer];
 
   _edgeGesture = [[UIScreenEdgePanGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(edgeGestureTriggered:)];
   //_edgeGesture.edges = UIRectEdgeLeft;
   _edgeGesture.delegate = self;
-  [view addGestureRecognizer:_edgeGesture];
+  [_view addGestureRecognizer:_edgeGesture];
 
   _swipeGesture = [[UISwipeGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(swipeGestureTriggered:)];
   _swipeGesture.numberOfTouchesRequired = 2;
   _swipeGesture.delegate = self;
-  [view addGestureRecognizer:_swipeGesture];
+  [_view addGestureRecognizer:_swipeGesture];
 
   return self;
 }
 
 // TODO(nicholss): The following several methods have been commented out.
 // Integreation with the original implementation will be done with the app
 // is able to run to the point of interaction and debugging can happen.
 // I would prefer to leave this here rather than deleting because it is close
 // to the implementation that will be used client gestures integration.
 // This is a new class that was derived from the original source which had
@@ skipping 184 matching lines @@
   //   }
   // }
 }
 
 - (IBAction)twoFingerTapGestureTriggered:(UITapGestureRecognizer*)sender {
   CGPoint touchPoint = [sender locationInView:_view];
   _client.gestureInterpreter->TwoFingerTap(touchPoint.x, touchPoint.y);
 }
 
 - (IBAction)threeFingerTapGestureTriggered:(UITapGestureRecognizer*)sender {
-  // LOG_TRACE(INFO) << "threeFingerTapGestureTriggered";
-  if (_inputScheme == HostInputSchemeTouch) {
-    // disabled
-    return;
-  }
-
-  // if ([_scene containsTouchPoint:[sender locationInView:self.view]]) {
-  //   [Utility middleClickOn:_clientToHostProxy at:_scene.mousePosition];
-  // }
+  CGPoint touchPoint = [sender locationInView:_view];
+  _client.gestureInterpreter->ThreeFingerTap(touchPoint.x, touchPoint.y);
 }
 
 - (IBAction)threeFingerPanGestureTriggered:(UIPanGestureRecognizer*)sender {
   // LOG_TRACE(INFO) << "threeFingerPanGestureTriggered";
-  // if ([sender state] == UIGestureRecognizerStateChanged) {
-  //   CGPoint translation = [sender translationInView:self.view];
-  //   if (translation.y > 0) {
-  //     // Swiped down - do nothing
-  //   } else if (translation.y < 0) {
-  //     // Swiped up
-  //     [_keyEntryView becomeFirstResponder];
-  //   }
-  //   [sender setTranslation:CGPointZero inView:self.view];
-  // }
+  if ([sender state] != UIGestureRecognizerStateEnded) {
+    return;
+  }
+
+  CGPoint translation = [sender translationInView:_view];
+  if (translation.y > 0) {
+    // Swiped down - hide keyboard (for now)
+    [_controller hideKeyboard];
+  } else if (translation.y < 0) {
+    // Swiped up - show keyboard
+    [_controller showKeyboard];
+  }
 }
 
 - (IBAction)edgeGestureTriggered:(UIScreenEdgePanGestureRecognizer*)sender {
   // LOG_TRACE(INFO) << "edgeGestureTriggered";
 }
 
 - (IBAction)swipeGestureTriggered:(UISwipeGestureRecognizer*)sender {
   // LOG_TRACE(INFO) << "swipeGestureTriggered";
 }
 
@@ skipping 39 matching lines @@
       otherGestureRecognizer == _edgeGesture) {
     return YES;
   }
   // TODO(nicholss): If we return NO here, it dismisses the other reconizers.
   // As we add more types of reconizers, they need to be accounted for in the
   // above logic.
   return NO;
 }
 
 @end