[CRD iOS] Add support for three-finger gestures

remoting/ios/client_gestures.h

 // 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.
 
 #ifndef REMOTING_IOS_CLIENT_GESTURES_H_
 #define REMOTING_IOS_CLIENT_GESTURES_H_
 
 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 
+@class HostViewController;
 @class RemotingClient;
 
 typedef NS_ENUM(NSInteger, HostInputScheme) {
   // Mouse cursor is shown
   // Dragging or Panning, moves the mouse cursor
   // Tapping causes mouse input at the cursor location
   HostInputSchemeTrackpad = 0,  // Default
   // Mouse cursor is not shown
   // Dragging or Panning is similar to a map
   // Tapping causes mouse input at the tap location
@@ skipping 16 matching lines @@
   UIPanGestureRecognizer* _threeFingerPanRecognizer;
   UIPinchGestureRecognizer* _pinchRecognizer;
   UITapGestureRecognizer* _singleTapRecognizer;
   UITapGestureRecognizer* _twoFingerTapRecognizer;
   UITapGestureRecognizer* _threeFingerTapRecognizer;
   UIScreenEdgePanGestureRecognizer* _edgeGesture;
   UISwipeGestureRecognizer* _swipeGesture;
 
   __weak UIView* _view;
   __weak RemotingClient* _client;
+  __weak HostViewController* _controller;
 
   HostInputScheme _inputScheme;
 }
 
-- (instancetype)initWithView:(UIView*)view client:(RemotingClient*)client;
+- (instancetype)initWithHostViewController:(HostViewController*)controller;

[nicholss, 2017/05/24 14:36:49]

I don't think this is a good pattern in Obj-C, you should not be sending in a
full host view controller. The correct way would be to send in the minimum class
required to show the keyboard such as an UIResponder object, or create a small
delegate class that exposes the show/hide keyboard and pass that to the client
gesture class. 

Passing HostViewController tightly couples the application to the current
implementation, which we do not want to do because it will make it hard to
adjust later.

[Yuwei, 2017/05/24 19:52:09]

Done.

 
 // Zoom in/out
 - (IBAction)pinchGestureTriggered:(UIPinchGestureRecognizer*)sender;
 // Left mouse click, moves cursor
 - (IBAction)tapGestureTriggered:(UITapGestureRecognizer*)sender;
 // Scroll the view in 2d
 - (IBAction)panGestureTriggered:(UIPanGestureRecognizer*)sender;
 // Handle one finger fling gesture
 - (IBAction)flingGestureTriggered:(UIPanGestureRecognizer*)sender;
 // Handle two finger scroll gesture
 - (IBAction)scrollGestureTriggered:(UIPanGestureRecognizer*)sender;
 // Right mouse click and drag, moves cursor
 - (IBAction)longPressGestureTriggered:(UILongPressGestureRecognizer*)sender;
 // Right mouse click
 - (IBAction)twoFingerTapGestureTriggered:(UITapGestureRecognizer*)sender;
 // Middle mouse click
 - (IBAction)threeFingerTapGestureTriggered:(UITapGestureRecognizer*)sender;
 // Show hidden menus.  Swipe up for keyboard, swipe down for navigation menu
 - (IBAction)threeFingerPanGestureTriggered:(UIPanGestureRecognizer*)sender;
 
 @end
 
 #endif  //  REMOTING_IOS_CLIENT_GESTURES_H_