Initial commit

2017-08-15 16:59:01 +08:00
commit bdc83e07ef
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+/*
+ 
+ MIT License (MIT)
+ 
+ Copyright (c) 2015 Clement CN Tsang
+ 
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ 
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ 
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ 
+ */
+
+#import "PureLayout.h"
+#import "CTAssetsPickerDefines.h"
+#import "CTAssetThumbnailStacks.h"
+#import "CTAssetThumbnailView.h"
+
+
+@interface CTAssetThumbnailStacks ()
+
+@property (nonatomic, copy) NSArray *thumbnailViews;
+@property (nonatomic, assign) UIEdgeInsets edgeInsets;
+
+@property (nonatomic, assign) BOOL didSetupConstraints;
+
+@end
+
+
+
+@implementation CTAssetThumbnailStacks
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+    if (self = [super initWithFrame:frame])
+    {
+        _edgeInsets = UIEdgeInsetsMake(4.0, 0, 0, 0);
+        
+        self.opaque                 = YES;
+        self.clipsToBounds          = YES;
+        self.isAccessibilityElement = NO;
+        
+        [self setupViews];
+    }
+    
+    return self;
+}
+
+
+#pragma mark - Setup
+
+- (void)setupViews
+{
+    NSMutableArray *thumbnailViews = [NSMutableArray new];
+    
+    for (NSUInteger index = 0; index < 3; index++)
+    {
+        CTAssetThumbnailView *thumbnailView = [CTAssetThumbnailView newAutoLayoutView];
+        thumbnailView.showsDuration = NO;
+        thumbnailView.layer.borderColor = [UIColor whiteColor].CGColor;
+        thumbnailView.layer.borderWidth = 0.5f;
+        
+        [thumbnailViews addObject:thumbnailView];
+        [self insertSubview:thumbnailView atIndex:0];
+    }
+    
+    self.thumbnailViews = [NSArray arrayWithArray:thumbnailViews];
+}
+
+
+#pragma markt - Setters
+
+- (void)setThumbnailSize:(CGSize)thumbnailSize
+{
+    _thumbnailSize = thumbnailSize;
+
+    [self setNeedsUpdateConstraints];
+    [self updateConstraintsIfNeeded];
+}
+
+
+#pragma mark - Update auto layout constraints
+
+- (void)updateConstraints
+{
+    if (!self.didSetupConstraints)
+    {
+        for (NSUInteger index = 0; index < self.thumbnailViews.count; index++)
+        {
+            CTAssetThumbnailView *thumbnailView = [self thumbnailAtIndex:index];
+            
+            CGFloat delta = self.edgeInsets.top / 2;
+            
+            CGSize size = self.thumbnailSize;
+            size.width  -= index * delta * 2;
+            size.height -= index * delta * 2;
+            
+            CGFloat inset = (index * delta * 3);
+
+            [NSLayoutConstraint autoSetPriority:UILayoutPriorityRequired forConstraints:^{
+                [thumbnailView autoSetDimensionsToSize:size];
+            }];
+            
+            [NSLayoutConstraint autoSetPriority:UILayoutPriorityDefaultHigh forConstraints:^{
+                [thumbnailView autoAlignAxisToSuperviewAxis:ALAxisVertical];
+                [thumbnailView autoPinEdgeToSuperviewEdge:ALEdgeBottom withInset:inset];
+            }];
+        }
+        
+        self.didSetupConstraints = YES;
+    }
+    
+    [super updateConstraints];
+}
+
+
+- (CTAssetThumbnailView *)thumbnailAtIndex:(NSUInteger)index
+{
+    return self.thumbnailViews[index];
+}
+
+- (void)setHighlighted:(BOOL)highlighted
+{
+    for (CTAssetThumbnailView *thumbnailView in self.thumbnailViews)
+        thumbnailView.backgroundColor = CTAssetsPikcerThumbnailBackgroundColor;
+}
+
+@end