mirror of
https://github.com/wnagrodzki/DragGestureRecognizer_ObjC.git
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84 lines
3 KiB
Objective-C
84 lines
3 KiB
Objective-C
/*
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* Copyright (c) 2014 Wojciech Nagrodzki
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#import "NGDragGestureRecognizer.h"
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#import <UIKit/UIGestureRecognizerSubclass.h>
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@interface NGDragGestureRecognizer ()
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@property (assign, nonatomic) CGPoint initialTouchLocationInReferenceView;
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@property (strong, nonatomic) NSMapTable * initialTouchLocationsInViews;
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@end
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@implementation NGDragGestureRecognizer
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#pragma mark - Public Instance Methods
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- (CGPoint)translationInView:(UIView *)view
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{
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CGPoint currentLocation = [self locationInView:view];
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NSValue * initialLocationValue = [self.initialTouchLocationsInViews objectForKey:view];
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CGPoint initialLocation = initialLocationValue ? initialLocationValue.CGPointValue : [[self referenceView] convertPoint:self.initialTouchLocationInReferenceView toView:view];
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return CGPointMake(currentLocation.x - initialLocation.x, currentLocation.y - initialLocation.y);
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}
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- (void)setTranslation:(CGPoint)translation inView:(UIView *)view
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{
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CGPoint currentLocation = [self locationInView:view];
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CGPoint initialLocation = CGPointMake(currentLocation.x - translation.x, currentLocation.y - translation.y);
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NSValue * initialLocationValue = [NSValue valueWithCGPoint:initialLocation];
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[self.initialTouchLocationsInViews setObject:initialLocationValue forKey:view];
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}
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#pragma mark - Overriden
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- (void)setState:(UIGestureRecognizerState)state
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{
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[super setState:state];
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if (state == UIGestureRecognizerStateBegan) {
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[self.initialTouchLocationsInViews removeAllObjects];
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self.initialTouchLocationInReferenceView = [self locationInView:[self referenceView]];
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}
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}
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#pragma mark - Private Instance Methods
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- (NSMapTable *)initialTouchLocationsInViews
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{
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if (_initialTouchLocationsInViews == nil) {
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_initialTouchLocationsInViews = [NSMapTable weakToStrongObjectsMapTable];
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}
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return _initialTouchLocationsInViews;
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}
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#pragma mark - Private Methods
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- (UIView *)referenceView
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{
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return self.view;
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}
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@end
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