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57 changes: 57 additions & 0 deletions
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JSQMessagesViewController/Layout/JSQMessagesBubbleSizeCalculating.h
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| // | ||
| // Created by Jesse Squires | ||
| // http://www.jessesquires.com | ||
| // | ||
| // | ||
| // Documentation | ||
| // http://cocoadocs.org/docsets/JSQMessagesViewController | ||
| // | ||
| // | ||
| // GitHub | ||
| // https://github.com/jessesquires/JSQMessagesViewController | ||
| // | ||
| // | ||
| // License | ||
| // Copyright (c) 2014 Jesse Squires | ||
| // Released under an MIT license: http://opensource.org/licenses/MIT | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
| #import <UIKit/UIKit.h> | ||
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| @class JSQMessagesCollectionViewFlowLayout; | ||
| @protocol JSQMessageData; | ||
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| /** | ||
| * The `JSQMessagesBubbleSizeCalculating` protocol defines the common interface through which | ||
| * an object provides layout information to an instance of `JSQMessagesCollectionViewFlowLayout`. | ||
| * | ||
| * A concrete class that conforms to this protocol is provided in the library. | ||
| * See `JSQMessagesBubbleSizeCalculator`. | ||
| */ | ||
| @protocol JSQMessagesBubbleSizeCalculating <NSObject> | ||
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| /** | ||
| * Computes and returns the size of the `messageBubbleImageView` property | ||
| * of a `JSQMessagesCollectionViewCell` for the specified messageData at indexPath. | ||
| * | ||
| * @param messageData A message data object. | ||
| * @param indexPath The index path at which messageData is located. | ||
| * @param layout The layout object asking for this information. | ||
| * | ||
| * @return A sizes that specifies the required dimensions to display the entire message contents. | ||
| * Note, this is *not* the entire cell, but only its message bubble. | ||
| */ | ||
| - (CGSize)messageBubbleSizeForMessageData:(id<JSQMessageData>)messageData | ||
| atIndexPath:(NSIndexPath *)indexPath | ||
| withLayout:(JSQMessagesCollectionViewFlowLayout *)layout; | ||
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| /** | ||
| * Notifies the receiver that the layout will be reset. | ||
| * Use this method to clear any cached layout information, if necessary. | ||
| * | ||
| * @param layout The layout object notifying the receiver. | ||
| */ | ||
| - (void)prepareForResettingLayout:(JSQMessagesCollectionViewFlowLayout *)layout; | ||
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| @end |
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JSQMessagesViewController/Layout/JSQMessagesBubblesSizeCalculator.h
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| // | ||
| // Created by Jesse Squires | ||
| // http://www.jessesquires.com | ||
| // | ||
| // | ||
| // Documentation | ||
| // http://cocoadocs.org/docsets/JSQMessagesViewController | ||
| // | ||
| // | ||
| // GitHub | ||
| // https://github.com/jessesquires/JSQMessagesViewController | ||
| // | ||
| // | ||
| // License | ||
| // Copyright (c) 2014 Jesse Squires | ||
| // Released under an MIT license: http://opensource.org/licenses/MIT | ||
| // | ||
|
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| #import <Foundation/Foundation.h> | ||
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| #import "JSQMessagesBubbleSizeCalculating.h" | ||
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| /** | ||
| * An instance of `JSQMessagesBubblesSizeCalculator` is responsible for calculating | ||
| * message bubble sizes for an instance of `JSQMessagesCollectionViewFlowLayout`. | ||
| */ | ||
| @interface JSQMessagesBubblesSizeCalculator : NSObject <JSQMessagesBubbleSizeCalculating> | ||
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| /** | ||
| * Initializes and returns a bubble size calculator with the given cache and minimumBubbleWidth. | ||
| * | ||
| * @param cache A cache object used to store layout information. | ||
| * @param minimumBubbleWidth The minimum width for any given message bubble. | ||
| * | ||
| * @return An initialized `JSQMessagesBubblesSizeCalculator` object if successful, `nil` otherwise. | ||
| */ | ||
| - (instancetype)initWithCache:(NSCache *)cache | ||
| minimumBubbleWidth:(NSUInteger)minimumBubbleWidth NS_DESIGNATED_INITIALIZER; | ||
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| @end |
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JSQMessagesViewController/Layout/JSQMessagesBubblesSizeCalculator.m
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,141 @@ | ||
| // | ||
| // Created by Jesse Squires | ||
| // http://www.jessesquires.com | ||
| // | ||
| // | ||
| // Documentation | ||
| // http://cocoadocs.org/docsets/JSQMessagesViewController | ||
| // | ||
| // | ||
| // GitHub | ||
| // https://github.com/jessesquires/JSQMessagesViewController | ||
| // | ||
| // | ||
| // License | ||
| // Copyright (c) 2014 Jesse Squires | ||
| // Released under an MIT license: http://opensource.org/licenses/MIT | ||
| // | ||
|
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| #import "JSQMessagesBubblesSizeCalculator.h" | ||
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| #import "JSQMessagesCollectionView.h" | ||
| #import "JSQMessagesCollectionViewDataSource.h" | ||
| #import "JSQMessagesCollectionViewFlowLayout.h" | ||
| #import "JSQMessageData.h" | ||
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| #import "UIImage+JSQMessages.h" | ||
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| @interface JSQMessagesBubblesSizeCalculator () | ||
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| @property (strong, nonatomic, readonly) NSCache *cache; | ||
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| @property (assign, nonatomic, readonly) NSUInteger minimumBubbleWidth; | ||
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| @end | ||
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| @implementation JSQMessagesBubblesSizeCalculator | ||
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| #pragma mark - Init | ||
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| - (instancetype)initWithCache:(NSCache *)cache minimumBubbleWidth:(NSUInteger)minimumBubbleWidth | ||
| { | ||
| NSParameterAssert(cache != nil); | ||
| NSParameterAssert(minimumBubbleWidth > 0); | ||
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| self = [super init]; | ||
| if (self) { | ||
| _cache = cache; | ||
| _minimumBubbleWidth = minimumBubbleWidth; | ||
| } | ||
| return self; | ||
| } | ||
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| - (instancetype)init | ||
| { | ||
| NSCache *cache = [NSCache new]; | ||
| cache.name = @"JSQMessagesBubblesSizeCalculator.cache"; | ||
| cache.countLimit = 200; | ||
| return [self initWithCache:cache | ||
| minimumBubbleWidth:[UIImage jsq_bubbleCompactImage].size.width]; | ||
| } | ||
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| #pragma mark - NSObject | ||
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| - (NSString *)description | ||
| { | ||
| return [NSString stringWithFormat:@"<%@: cache=%@, minimumBubbleWidth=%@>", | ||
| [self class], self.cache, @(self.minimumBubbleWidth)]; | ||
| } | ||
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| #pragma mark - JSQMessagesBubbleSizeCalculating | ||
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| - (void)prepareForResettingLayout:(JSQMessagesCollectionViewFlowLayout *)layout | ||
| { | ||
| [self.cache removeAllObjects]; | ||
| } | ||
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| - (CGSize)messageBubbleSizeForMessageData:(id<JSQMessageData>)messageData | ||
| atIndexPath:(NSIndexPath *)indexPath | ||
| withLayout:(JSQMessagesCollectionViewFlowLayout *)layout | ||
| { | ||
| NSValue *cachedSize = [self.cache objectForKey:@([messageData messageHash])]; | ||
| if (cachedSize != nil) { | ||
| return [cachedSize CGSizeValue]; | ||
| } | ||
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| CGSize finalSize = CGSizeZero; | ||
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| if ([messageData isMediaMessage]) { | ||
| finalSize = [[messageData media] mediaViewDisplaySize]; | ||
| } | ||
| else { | ||
| CGSize avatarSize = [self jsq_avatarSizeForMessageData:messageData withLayout:layout]; | ||
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| // from the cell xibs, there is a 2 point space between avatar and bubble | ||
| CGFloat spacingBetweenAvatarAndBubble = 2.0f; | ||
| CGFloat horizontalContainerInsets = layout.messageBubbleTextViewTextContainerInsets.left + layout.messageBubbleTextViewTextContainerInsets.right; | ||
| CGFloat horizontalFrameInsets = layout.messageBubbleTextViewFrameInsets.left + layout.messageBubbleTextViewFrameInsets.right; | ||
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| CGFloat horizontalInsetsTotal = horizontalContainerInsets + horizontalFrameInsets + spacingBetweenAvatarAndBubble; | ||
| CGFloat maximumTextWidth = layout.itemWidth - avatarSize.width - layout.messageBubbleLeftRightMargin - horizontalInsetsTotal; | ||
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| CGRect stringRect = [[messageData text] boundingRectWithSize:CGSizeMake(maximumTextWidth, CGFLOAT_MAX) | ||
| options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) | ||
| attributes:@{ NSFontAttributeName : layout.messageBubbleFont } | ||
| context:nil]; | ||
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| CGSize stringSize = CGRectIntegral(stringRect).size; | ||
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| CGFloat verticalContainerInsets = layout.messageBubbleTextViewTextContainerInsets.top + layout.messageBubbleTextViewTextContainerInsets.bottom; | ||
| CGFloat verticalFrameInsets = layout.messageBubbleTextViewFrameInsets.top + layout.messageBubbleTextViewFrameInsets.bottom; | ||
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| // add extra 2 points of space, because `boundingRectWithSize:` is slightly off | ||
| // not sure why. magix. (shrug) if you know, submit a PR | ||
| CGFloat verticalInsets = verticalContainerInsets + verticalFrameInsets + 2.0f; | ||
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| // same as above, an extra 2 points of magix | ||
| CGFloat finalWidth = MAX(stringSize.width + horizontalInsetsTotal, self.minimumBubbleWidth) + 2.0f; | ||
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| finalSize = CGSizeMake(finalWidth, stringSize.height + verticalInsets); | ||
| } | ||
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| [self.cache setObject:[NSValue valueWithCGSize:finalSize] forKey:@([messageData messageHash])]; | ||
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| return finalSize; | ||
| } | ||
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| - (CGSize)jsq_avatarSizeForMessageData:(id<JSQMessageData>)messageData | ||
| withLayout:(JSQMessagesCollectionViewFlowLayout *)layout | ||
| { | ||
| NSString *messageSender = [messageData senderId]; | ||
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| if ([messageSender isEqualToString:[layout.collectionView.dataSource senderId]]) { | ||
| return layout.outgoingAvatarViewSize; | ||
| } | ||
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| return layout.incomingAvatarViewSize; | ||
| } | ||
|
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| @end |
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