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2017-08-15 16:59:01 +08:00
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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 "CTAssetSelectionLabel.h"
+#import "CTAssetsPickerDefines.h"
+
+
+/**
+ *  The label to show selection index.
+ */
+@interface CTAssetSelectionLabel ()
+
+#pragma mark Managing Auto Layout
+
+/**
+ *  The constraints of the size of the label.
+ */
+@property (nonatomic, strong) NSArray *sizeConstraints;
+
+/**
+ *  The constraint for pinning the label to vertical edge.
+ */
+@property (nonatomic, strong) NSLayoutConstraint *verticalConstraint;
+
+/**
+ *  The constraint for pinning the label to horizontal edge.
+ */
+@property (nonatomic, strong) NSLayoutConstraint *horizontalConstraint;
+
+/**
+ *  Determines whether or not the constraints have been set up.
+ */
+@property (nonatomic, assign) BOOL didSetupConstraints;
+
+@end
+
+
+@implementation CTAssetSelectionLabel
+
+#pragma mark Initializing a Label Object
+
+/**
+ *  Designated Initializer
+ *
+ *  @return an initialized label object
+ */
+- (instancetype)initWithFrame:(CGRect)frame
+{
+    self = [super initWithFrame:frame];
+    
+    if (self)
+    {
+        self.textAlignment = NSTextAlignmentCenter;
+        self.font = CTAssetLabelFont;
+        self.textColor = CTAssetLabelTextColor;
+        self.backgroundColor = CTAssetLabelBackgroundColor;
+        self.layer.borderColor = CTAssetLabelBorderColor.CGColor;
+        self.layer.masksToBounds = YES;
+        self.isAccessibilityElement = NO;
+    }
+    
+    return self;
+}
+
+
+#pragma mark Customizing Appearance
+
+/**
+ *  The width of the label's border
+ */
+- (CGFloat)borderWidth
+{
+    return self.layer.borderWidth;
+}
+
+- (void)setBorderWidth:(CGFloat)borderWidth
+{
+    self.layer.borderWidth = borderWidth;
+}
+
+/**
+ *  The color of the label's border
+ */
+
+- (UIColor *)borderColor
+{
+    return [UIColor colorWithCGColor:self.layer.borderColor];
+}
+
+- (void)setBorderColor:(UIColor *)borderColor
+{
+    UIColor *color = (borderColor) ? borderColor : CTAssetLabelBorderColor;
+    self.layer.borderColor = color.CGColor;
+}
+
+/**
+ *  To set the size of label.
+ *
+ *  @param size The size of the label.
+ */
+- (void)setSize:(CGSize)size
+{
+    if (CGSizeEqualToSize(size, CGSizeZero)) {
+        size = CTAssetLabelSize;
+    }
+
+    [self removeConstraints:self.sizeConstraints];
+    
+    [NSLayoutConstraint autoSetPriority:UILayoutPriorityRequired forConstraints:^{
+        self.sizeConstraints = [self autoSetDimensionsToSize:size];
+    }];
+}
+
+/**
+ *  To set the size of label.
+ *
+ *  @param cornerRadius The radius to use when drawing rounded corners for the label’s background.
+ */
+- (void)setCornerRadius:(CGFloat)cornerRadius
+{
+    self.layer.cornerRadius = cornerRadius;
+}
+
+/**
+ *  To set margin of the label from the edges.
+ *
+ *  @param margin The margin from the edges.
+ *
+ *  @see setMargin:forVerticalEdge:horizontalEdge:
+ */
+- (void)setMargin:(CGFloat)margin
+{
+    [self setMargin:margin forVerticalEdge:NSLayoutAttributeRight horizontalEdge:NSLayoutAttributeBottom];
+}
+
+/**
+ *  To set margin of the label from specific edges.
+ *
+ *  @param margin The margin from the edges.
+ *  @param edgeX  The layout attribute respresents vertical edge that the label pins to. Either `NSLayoutAttributeLeft` or `NSLayoutAttributeRight`.
+ *  @param edgeY  The layout attribute respresents horizontal edge that the label pins to. Either `NSLayoutAttributeTop` or `NSLayoutAttributeBottom`.
+ *
+ *  @see setMargin:
+ */
+- (void)setMargin:(CGFloat)margin forVerticalEdge:(NSLayoutAttribute)edgeX horizontalEdge:(NSLayoutAttribute)edgeY
+{
+    NSAssert(edgeX == NSLayoutAttributeLeft || edgeX == NSLayoutAttributeRight,
+             @"Vertical edge must be NSLayoutAttributeLeft or NSLayoutAttributeRight");
+
+    NSAssert(edgeY == NSLayoutAttributeTop || edgeY == NSLayoutAttributeBottom,
+             @"Horizontal edge must be NSLayoutAttributeTop or NSLayoutAttributeBottom");
+
+    [self.superview removeConstraints:@[self.verticalConstraint, self.horizontalConstraint]];
+    self.verticalConstraint   = [self autoPinEdgeToSuperviewEdge:(ALEdge)edgeX withInset:margin];
+    self.horizontalConstraint = [self autoPinEdgeToSuperviewEdge:(ALEdge)edgeY withInset:margin];
+}
+
+/**
+ *  To set the text attributes to display the label.
+ *
+ *  Currently only supports attributes `NSFontAttributeName`, `NSForegroundColorAttributeName` and `NSBackgroundColorAttributeName`.
+ *
+ *  @param textAttributes The text attributes used to display the label.
+ */
+- (void)setTextAttributes:(NSDictionary *)textAttributes
+{
+    self.font  = (textAttributes) ? textAttributes[NSFontAttributeName] : CTAssetLabelFont;
+    self.textColor = (textAttributes) ? textAttributes[NSForegroundColorAttributeName] : CTAssetLabelTextColor;
+    self.backgroundColor = (textAttributes) ? textAttributes[NSBackgroundColorAttributeName] : CTAssetLabelBackgroundColor;
+}
+
+
+#pragma mark Triggering Auto Layout
+
+/**
+ *  Updates constraints of the label.
+ */
+- (void)updateConstraints
+{
+    if (!self.didSetupConstraints)
+    {
+        [NSLayoutConstraint autoSetPriority:UILayoutPriorityRequired forConstraints:^{
+            self.sizeConstraints = [self autoSetDimensionsToSize:CTAssetLabelSize];
+        }];
+
+        self.verticalConstraint   = [self autoPinEdgeToSuperviewEdge:ALEdgeRight withInset:0];
+        self.horizontalConstraint = [self autoPinEdgeToSuperviewEdge:ALEdgeBottom withInset:0];
+        
+        self.didSetupConstraints = YES;
+    }
+    
+    [super updateConstraints];
+}
+
+@end