google/EarlGrey

//
// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#import "Action/GREYMultiFingerSwipeAction.h"

#import "Action/GREYPathGestureUtils.h"
#import "Additions/NSError+GREYAdditions.h"
#import "Additions/NSObject+GREYAdditions.h"
#import "Additions/NSString+GREYAdditions.h"
#import "Assertion/GREYAssertionDefines.h"
#import "Assertion/GREYAssertions+Internal.h"
#import "Common/GREYError.h"
#import "Common/GREYFatalAsserts.h"
#import "Event/GREYSyntheticEvents.h"
#import "Matcher/GREYAllOf.h"
#import "Matcher/GREYMatcher.h"
#import "Matcher/GREYMatchers.h"
#import "Matcher/GREYNot.h"

@implementation GREYMultiFingerSwipeAction {
  /**
   *  The direction in which the content must be scrolled.
   */
  GREYDirection _direction;
  /**
   *  The duration within which the swipe action must be complete.
   */
  CFTimeInterval _duration;
  /**
   *  Start point for the swipe specified as a percentage of the swipped element's accessibility
   *  frame.
   */
  CGPoint _startPercents;
  /**
   *  Number of parallel swipes.
   */
  NSUInteger _numberOfFingers;
}

- (instancetype)initWithDirection:(GREYDirection)direction
                         duration:(CFTimeInterval)duration
                  numberOfFingers:(NSUInteger)numberOfFingers {
  return [self initWithDirection:direction
                        duration:duration
                 numberOfFingers:numberOfFingers
                   startPercents:CGPointMake(0.5, 0.5)];
}

- (instancetype)initWithDirection:(GREYDirection)direction
                         duration:(CFTimeInterval)duration
                  numberOfFingers:(NSUInteger)numberOfFingers
                    startPercents:(CGPoint)startPercents {
  GREYFatalAssertWithMessage(startPercents.x > 0.0f && startPercents.x < 1.0f,
                             @"percents.x must be between 0 and 1, exclusive.");
  GREYFatalAssertWithMessage(startPercents.y > 0.0f && startPercents.y < 1.0f,
                             @"percents.y must be between 0 and 1, exclusive.");
  GREYFatalAssertWithMessage(numberOfFingers > 1 && numberOfFingers <= 4,
                             @"numberOfFingers must be between 2 and 4 inclusive. "
                             @"For single touch use the single touch APIs "
                             @"(grey_swipeFastInDirection etc).");

  NSString *name =
      [NSString stringWithFormat:@"Swipe %@ for duration %g", NSStringFromGREYDirection(direction),
                                 duration];
  self = [super initWithName:name
                 constraints:grey_allOf(grey_interactable(),
                                        grey_not(grey_systemAlertViewShown()),
                                        grey_kindOfClass([UIView class]),
                                        grey_respondsToSelector(@selector(accessibilityFrame)),
                                        nil)];
  if (self) {
    _direction = direction;
    _duration = duration;
    _numberOfFingers = numberOfFingers;
    _startPercents = startPercents;
  }
  return self;
}

#pragma mark - GREYAction

- (BOOL)perform:(id)element error:(__strong NSError**)errorOrNil {
  if (![self satisfiesConstraintsForElement:element error:errorOrNil]) {
    return NO;
  }

  UIWindow *window = [element window];
  if (!window) {
    if ([element isKindOfClass:[UIWindow class]]) {
      window = (UIWindow *)element;
    } else {
      NSString *errorDescription =
          [NSString stringWithFormat:@"Cannot perform multi-finger swipe on view [V], as it has no "
                                     @" window and it isn't a window itself."];
      NSDictionary *glossary = @{ @"V" : [element grey_description] };
      GREYError *error;
      error = GREYErrorMake(kGREYSyntheticEventInjectionErrorDomain,
                            kGREYOrientationChangeFailedErrorCode,
                            errorDescription);
      error.descriptionGlossary = glossary;
      if (errorOrNil) {
        *errorOrNil = error;
      } else {
        [GREYAssertions grey_raiseExceptionNamed:kGREYGenericFailureException
                                exceptionDetails:@""
                                       withError:error];
      }
      return NO;
    }
  }

  NSMutableArray *multiTouchPaths = [[NSMutableArray alloc] init];
  CGRect accessibilityFrame = [element accessibilityFrame];

  for(NSUInteger i = 0; i < _numberOfFingers; i++) {
    CGFloat xOffset, yOffset;
    switch (_direction) {
      case kGREYDirectionDown:
      case kGREYDirectionUp:
        xOffset = (CGFloat)i * 10;
        yOffset = 0.0;
        break;

      case kGREYDirectionLeft:
      case kGREYDirectionRight:
        xOffset = 0.0;
        yOffset = (CGFloat)i * 10;
        break;
    }

    CGFloat xStartPoint = xOffset + CGRectGetMaxX(accessibilityFrame) * _startPercents.x;
    CGFloat yStartPoint = yOffset + CGRectGetMaxY(accessibilityFrame) * _startPercents.y;
    CGPoint startPoint = CGPointMake(xStartPoint, yStartPoint);
    NSArray *touchPath = [GREYPathGestureUtils touchPathForGestureWithStartPoint:startPoint
                                                                    andDirection:_direction
                                                                     andDuration:_duration
                                                                        inWindow:window];
    [multiTouchPaths addObject:touchPath];
  }

  [GREYSyntheticEvents touchAlongMultiplePaths:multiTouchPaths
                              relativeToWindow:window
                                   forDuration:_duration
                                    expendable:YES];
  return YES;
}
@end