Upstream Chrome on iOS source code [4/11].

ios/chrome/browser/ui/fade_truncated_label.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CHROME_BROWSER_UI_FADE_TRUNCATED_LABEL_H_
+#define IOS_CHROME_BROWSER_UI_FADE_TRUNCATED_LABEL_H_
+
+#import <UIKit/UIKit.h>
+
+// A label class that applies a gradient fade to the end of a label whose bounds
+// are too small to draw the entire string.  This class uses a CAGradientLayer
+// as a mask instead of clipping the drawing context of the label.
+@interface FadeTruncatedLabel : UILabel
+
+// Returns a CAGadientLayer to use as a label's masking layer that will apply
+// a fade truncation if |text| takes up more space than |bounds| when drawn
+// with |attributes|.
++ (CAGradientLayer*)maskLayerForText:(NSString*)text
+                      withAttributes:(NSDictionary*)attributes
+                            inBounds:(CGRect)bounds;
+
+// Adds animations from |beginFrame| to |endFrame| using the provided |duration|
+// and |timingFunction|.
+- (void)animateFromBeginFrame:(CGRect)beginFrame
+                   toEndFrame:(CGRect)endFrame
+                     duration:(CFTimeInterval)duration
+               timingFunction:(CAMediaTimingFunction*)timingFunction;
+
+// Reverses animations added by
+// |-animateFromBeginFrame:toEndFrame:duration:timingFunction:|.
+- (void)reverseAnimations;
+
+// Removes animations added by
+// |-animateFromBeginFrame:toEndFrame:duration:timingFunction:|.
+- (void)cleanUpAnimations;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_FADE_TRUNCATED_LABEL_H_