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// 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 "remoting/client/gesture_interpreter.h"
static 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;
}
}
@interface ClientGestures ()<UIGestureRecognizerDelegate> {
@private
UILongPressGestureRecognizer* _longPressRecognizer;
UIPanGestureRecognizer* _panRecognizer;
UIPanGestureRecognizer* _flingRecognizer;
UIPanGestureRecognizer* _scrollRecognizer;
// TODO(yuweih): Commented out because this makes two-finger gestures not
// quite responsive. Clean these up if it's really unnecessary.
// UIPanGestureRecognizer* _threeFingerPanRecognizer;
UIPinchGestureRecognizer* _pinchRecognizer;
UITapGestureRecognizer* _singleTapRecognizer;
UITapGestureRecognizer* _twoFingerTapRecognizer;
UITapGestureRecognizer* _threeFingerTapRecognizer;
UITapGestureRecognizer* _fourFingerTapRecognizer;
__weak UIView* _view;
base::WeakPtr<remoting::GestureInterpreter> _gestureInterpreter;
}
@end
@implementation ClientGestures
@synthesize delegate = _delegate;
- (instancetype)initWithView:(UIView*)view client:(RemotingClient*)client {
_view = view;
_gestureInterpreter = client.gestureInterpreter->GetWeakPtr();
_longPressRecognizer = [[UILongPressGestureRecognizer alloc]
initWithTarget:self
action:@selector(longPressGestureTriggered:)];
_longPressRecognizer.delegate = self;
[view addGestureRecognizer:_longPressRecognizer];
_panRecognizer = [[UIPanGestureRecognizer alloc]
initWithTarget:self
action:@selector(panGestureTriggered:)];
_panRecognizer.minimumNumberOfTouches = 1;
_panRecognizer.maximumNumberOfTouches = 2;
_panRecognizer.delegate = self;
[view addGestureRecognizer:_panRecognizer];
_flingRecognizer = [[UIPanGestureRecognizer alloc]
initWithTarget:self
action:@selector(flingGestureTriggered:)];
_flingRecognizer.minimumNumberOfTouches = 1;
_flingRecognizer.maximumNumberOfTouches = 1;
_flingRecognizer.delegate = self;
[view addGestureRecognizer:_flingRecognizer];
_scrollRecognizer = [[UIPanGestureRecognizer alloc]
initWithTarget:self
action:@selector(scrollGestureTriggered:)];
_scrollRecognizer.minimumNumberOfTouches = 2;
_scrollRecognizer.maximumNumberOfTouches = 2;
_scrollRecognizer.delegate = self;
[view addGestureRecognizer:_scrollRecognizer];
// _threeFingerPanRecognizer = [[UIPanGestureRecognizer alloc]
// initWithTarget:self
// action:@selector(threeFingerPanGestureTriggered:)];
// _threeFingerPanRecognizer.minimumNumberOfTouches = 3;
// _threeFingerPanRecognizer.maximumNumberOfTouches = 3;
// _threeFingerPanRecognizer.delegate = self;
// [view addGestureRecognizer:_threeFingerPanRecognizer];
_pinchRecognizer = [[UIPinchGestureRecognizer alloc]
initWithTarget:self
action:@selector(pinchGestureTriggered:)];
_pinchRecognizer.delegate = self;
[view addGestureRecognizer:_pinchRecognizer];
_singleTapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:@selector(tapGestureTriggered:)];
_singleTapRecognizer.delegate = self;
[view addGestureRecognizer:_singleTapRecognizer];
_twoFingerTapRecognizer = [[UITapGestureRecognizer alloc]
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;
_threeFingerTapRecognizer.delegate = self;
[view addGestureRecognizer:_threeFingerTapRecognizer];
_fourFingerTapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:@selector(fourFingerTapGestureTriggered:)];
_fourFingerTapRecognizer.numberOfTouchesRequired = 4;
_fourFingerTapRecognizer.delegate = self;
[view addGestureRecognizer:_fourFingerTapRecognizer];
[_singleTapRecognizer requireGestureRecognizerToFail:_twoFingerTapRecognizer];
[_twoFingerTapRecognizer
requireGestureRecognizerToFail:_threeFingerTapRecognizer];
[_pinchRecognizer requireGestureRecognizerToFail:_singleTapRecognizer];
// [_pinchRecognizer
// requireGestureRecognizerToFail:_threeFingerPanRecognizer];
[_panRecognizer requireGestureRecognizerToFail:_singleTapRecognizer];
// [_threeFingerPanRecognizer
// requireGestureRecognizerToFail:_threeFingerTapRecognizer];
[_panRecognizer requireGestureRecognizerToFail:_scrollRecognizer];
return self;
}
// Resize the view of the desktop - Zoom in/out. This can occur during a Pan.
- (IBAction)pinchGestureTriggered:(UIPinchGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
CGPoint pivot = [sender locationInView:_view];
_gestureInterpreter->Zoom(pivot.x, pivot.y, sender.scale,
toGestureState([sender state]));
sender.scale = 1.0; // reset scale so next iteration is a relative ratio
}
- (IBAction)tapGestureTriggered:(UITapGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
CGPoint touchPoint = [sender locationInView:_view];
_gestureInterpreter->Tap(touchPoint.x, touchPoint.y);
}
// Change position of the viewport. This can occur during a pinch or long press.
- (IBAction)panGestureTriggered:(UIPanGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
if ([sender state] == UIGestureRecognizerStateChanged) {
CGPoint translation = [sender translationInView:_view];
_gestureInterpreter->Pan(translation.x, translation.y);
// Reset translation so next iteration is relative
[sender setTranslation:CGPointZero inView:_view];
}
}
// Do fling on the viewport. This will happen at the end of the one-finger
// panning.
- (IBAction)flingGestureTriggered:(UIPanGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
if ([sender state] == UIGestureRecognizerStateEnded) {
CGPoint velocity = [sender velocityInView:_view];
if (velocity.x != 0 || velocity.y != 0) {
_gestureInterpreter->OneFingerFling(velocity.x, velocity.y);
}
}
}
// Handles the two finger scrolling gesture.
- (IBAction)scrollGestureTriggered:(UIPanGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
if ([sender state] == UIGestureRecognizerStateEnded) {
CGPoint velocity = [sender velocityInView:_view];
_gestureInterpreter->ScrollWithVelocity(velocity.x, velocity.y);
return;
}
CGPoint scrollPoint = [sender locationInView:_view];
CGPoint translation = [sender translationInView:_view];
_gestureInterpreter->Scroll(scrollPoint.x, scrollPoint.y, translation.x,
translation.y);
// Reset translation so next iteration is relative
[sender setTranslation:CGPointZero inView:_view];
}
// Click-Drag mouse operation. This can occur during a Pan.
- (IBAction)longPressGestureTriggered:(UILongPressGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
CGPoint touchPoint = [sender locationInView:_view];
_gestureInterpreter->Drag(touchPoint.x, touchPoint.y,
toGestureState([sender state]));
}
- (IBAction)twoFingerTapGestureTriggered:(UITapGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
CGPoint touchPoint = [sender locationInView:_view];
_gestureInterpreter->TwoFingerTap(touchPoint.x, touchPoint.y);
}
- (IBAction)threeFingerTapGestureTriggered:(UITapGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
CGPoint touchPoint = [sender locationInView:_view];
_gestureInterpreter->ThreeFingerTap(touchPoint.x, touchPoint.y);
}
- (IBAction)threeFingerPanGestureTriggered:(UIPanGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
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];
}
}
// To trigger the menu.
- (IBAction)fourFingerTapGestureTriggered:
(UILongPressGestureRecognizer*)sender {
if (!_gestureInterpreter) {
return;
}
[_delegate menuShouldShow];
}
#pragma mark - UIGestureRecognizerDelegate
// Allow panning and zooming to occur simultaneously.
// Allow panning and long press to occur simultaneously.
// Pinch requires 2 touches, and long press requires a single touch, so they are
// mutually exclusive regardless of if panning is the initiating gesture.
// Pinch and Scroll are both two-finger gestures. They are mutually exclusive
// and whatever comes first should disable the other gesture recognizer.
- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:
(UIGestureRecognizer*)otherGestureRecognizer {
if (gestureRecognizer == _pinchRecognizer ||
(gestureRecognizer == _panRecognizer)) {
if (otherGestureRecognizer == _pinchRecognizer ||
otherGestureRecognizer == _panRecognizer) {
return YES;
}
}
if (gestureRecognizer == _flingRecognizer ||
(gestureRecognizer == _panRecognizer)) {
if (otherGestureRecognizer == _flingRecognizer ||
otherGestureRecognizer == _panRecognizer) {
return YES;
}
}
if (gestureRecognizer == _longPressRecognizer ||
gestureRecognizer == _panRecognizer) {
if (otherGestureRecognizer == _longPressRecognizer ||
otherGestureRecognizer == _panRecognizer) {
return YES;
}
}
if (gestureRecognizer == _twoFingerTapRecognizer &&
otherGestureRecognizer == _longPressRecognizer) {
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