[Mac] Display a quick animation when a popup is blocked so the user notices it in the Omnibox.

chrome/browser/cocoa/animatable_image.mm

+// Copyright (c) 2010 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.
+
+#import "chrome/browser/cocoa/animatable_image.h"
+
+#include "base/logging.h"
+#include "base/scoped_cftyperef.h"
+#import "third_party/GTM/AppKit/GTMNSAnimation+Duration.h"
+
+@interface AnimatableImage (Private)
+- (void)setLayerContents:(CALayer*)layer;
+@end
+
+@implementation AnimatableImage
+
+@synthesize startFrame = startFrame_;
+@synthesize endFrame = endFrame_;
+@synthesize startOpacity = startOpacity_;
+@synthesize endOpacity = endOpacity_;
+@synthesize duration = duration_;
+
+- (id)initWithImage:(NSImage*)image
+     animationFrame:(NSRect)animationFrame {
+  if ((self = [super initWithContentRect:animationFrame
+                               styleMask:NSBorderlessWindowMask
+                                 backing:NSBackingStoreBuffered
+                                   defer:NO])) {
+    DCHECK(image);
+    image_.reset([image retain]);
+    duration_ = 1.0;
+    startOpacity_ = 1.0;
+    endOpacity_ = 1.0;
+
+    [self setOpaque:NO];
+    [self setBackgroundColor:[NSColor clearColor]];
+    [self setIgnoresMouseEvents:YES];
+
+    // Must be set or else self will be leaked.
+    [self setReleasedWhenClosed:YES];
+  }
+  return self;
+}
+
+- (void)startAnimation {
+  // Set up the root layer. By calling -setLayer: followed by -setWantsLayer:
+  // the view becomes a layer hosting view as opposed to a layer backed view.
+  NSView* view = [self contentView];
+  CALayer* rootLayer = [CALayer layer];
+  [view setLayer:rootLayer];
+  [view setWantsLayer:YES];
+
+  // Create the layer that will be animated.
+  CALayer* layer = [CALayer layer];
+  [self setLayerContents:layer];
+  [layer setAnchorPoint:CGPointMake(0, 1)];
+  [layer setFrame:[self startFrame]];
+  [layer setNeedsDisplayOnBoundsChange:YES];
+  [rootLayer addSublayer:layer];
+
+  // Common timing function for all animations.
+  CAMediaTimingFunction* mediaFunction =
+      [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
+
+  // Animate the bounds only if the image is resized.
+  CABasicAnimation* boundsAnimation = nil;
+  if (CGRectGetWidth([self startFrame]) != CGRectGetWidth([self endFrame]) ||
+      CGRectGetHeight([self startFrame]) != CGRectGetHeight([self endFrame])) {
+    boundsAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
+    NSRect startRect = NSMakeRect(0, 0,
+                                  CGRectGetWidth([self startFrame]),
+                                  CGRectGetHeight([self startFrame]));
+    [boundsAnimation setFromValue:[NSValue valueWithRect:startRect]];
+    NSRect endRect = NSMakeRect(0, 0,
+                                CGRectGetWidth([self endFrame]),
+                                CGRectGetHeight([self endFrame]));
+    [boundsAnimation setToValue:[NSValue valueWithRect:endRect]];
+    [boundsAnimation gtm_setDuration:[self duration]
+                           eventMask:NSLeftMouseUpMask];
+    [boundsAnimation setTimingFunction:mediaFunction];
+  }
+
+  // Positional animation.
+  CABasicAnimation* positionAnimation =
+      [CABasicAnimation animationWithKeyPath:@"position"];
+  [positionAnimation setFromValue:
+      [NSValue valueWithPoint:NSPointFromCGPoint([self startFrame].origin)]];
+  [positionAnimation setToValue:
+      [NSValue valueWithPoint:NSPointFromCGPoint([self endFrame].origin)]];
+  [positionAnimation gtm_setDuration:[self duration]
+                           eventMask:NSLeftMouseUpMask];
+  [positionAnimation setTimingFunction:mediaFunction];
+
+  // Opacity animation.
+  CABasicAnimation* opacityAnimation =
+      [CABasicAnimation animationWithKeyPath:@"opacity"];
+  [opacityAnimation setFromValue:
+      [NSNumber numberWithFloat:[self startOpacity]]];
+  [opacityAnimation setToValue:[NSNumber numberWithFloat:[self endOpacity]]];
+  [opacityAnimation gtm_setDuration:[self duration]
+                          eventMask:NSLeftMouseUpMask];
+  [opacityAnimation setTimingFunction:mediaFunction];
+  // Set the delegate just for one of the animations so that this window can
+  // be closed upon completion.
+  [opacityAnimation setDelegate:self];
+
+  // The CAAnimations only affect the presentational value of a layer, not the
+  // model value. This means that after the animation is done, it can flicker
+  // back to the original values. To avoid this, create an implicit animation of
+  // the values, which are then overridden with the CABasicAnimations.
+  [layer setPosition:[self endFrame].origin];
+  [layer setOpacity:[self endOpacity]];
+
+  // Start the animations.
+  [CATransaction begin];
+  [CATransaction setValue:[NSNumber numberWithFloat:[self duration]]
+                   forKey:kCATransactionAnimationDuration];
+  if (boundsAnimation) {
+    [layer addAnimation:boundsAnimation forKey:@"bounds"];
+  }
+  [layer addAnimation:positionAnimation forKey:@"position"];
+  [layer addAnimation:opacityAnimation forKey:@"opacity"];
+  [CATransaction commit];
+}
+
+// CALayer expects a CGImageRef contents. If the image is a PDF, 10.5 CGImage
+// cannot handle the conversion to bitmap. To get it to work, rasterize the
+// image into a bitmap CGImageRef. This is based loosely on
+// http://www.cocoadev.com/index.pl?CGImageRef.
+- (void)setLayerContents:(CALayer*)layer {
+  NSSize size = [image_ size];
+  CGContextRef context =
+      CGBitmapContextCreate(NULL,  // Allow CG to allocate memory.
+                            size.width,
+                            size.height,
+                            8,  // bitsPerComponent
+                            0,  // bytesPerRow - CG will calculate by default.
+                            [[NSColorSpace genericRGBColorSpace] CGColorSpace],
+                            kCGBitmapByteOrder32Host |
+                                kCGImageAlphaPremultipliedFirst);
+
+  [NSGraphicsContext saveGraphicsState];
+  [NSGraphicsContext setCurrentContext:
+      [NSGraphicsContext graphicsContextWithGraphicsPort:context flipped:NO]];
+  [image_ drawInRect:NSMakeRect(0,0, size.width, size.height)
+            fromRect:NSZeroRect
+           operation:NSCompositeCopy
+             fraction:1.0];
+  [NSGraphicsContext restoreGraphicsState];

[Nico, 2010/07/19 23:00:35]

Please put this into a utility function somewhere at some time (not in this CL,
but this week if possible)

+
+  scoped_cftyperef<CGImageRef> cgImage(CGBitmapContextCreateImage(context));
+  CGContextRelease(context);
+
+  // Create the layer that will be animated.
+  [layer setContents:(id)cgImage.get()];
+}
+
+// CAAnimation delegate method called when the animation is complete.
+- (void)animationDidStop:(CAAnimation*)animation finished:(BOOL)flag {
+  // Close the window, releasing self.
+  [self close];
+}
+
+@end