[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/session/remoting_client.h"
 
 #include "base/logging.h"
 #include "remoting/client/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
 
+@synthesize delegate = _delegate;
+
 - (instancetype)initWithView:(UIView*)view client:(RemotingClient*)client {
   _view = view;
   _client = client;
 
   _inputScheme = HostInputSchemeTouch;
 
   _longPressRecognizer = [[UILongPressGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(longPressGestureTriggered:)];
   _longPressRecognizer.delegate = self;
@@ skipping 47 matching lines @@
       initWithTarget:self
               action:@selector(twoFingerTapGestureTriggered:)];
   _twoFingerTapRecognizer.numberOfTouchesRequired = 2;
   _twoFingerTapRecognizer.delegate = self;
   [view addGestureRecognizer:_twoFingerTapRecognizer];
 
   _threeFingerTapRecognizer = [[UITapGestureRecognizer alloc]
       initWithTarget:self
               action:@selector(threeFingerTapGestureTriggered:)];
   _threeFingerTapRecognizer.numberOfTouchesRequired = 3;
-  _threeFingerPanRecognizer.delegate = self;
+  _threeFingerTapRecognizer.delegate = self;
   [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;
@@ skipping 202 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)
+    [_delegate keyboardShouldHide];
+  } else if (translation.y < 0) {
+    // Swiped up - show keyboard
+    [_delegate keyboardShouldShow];
+  }
 }
 
 - (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