chrome/browser/ui/cocoa/download/download_started_animation_mac.mm

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // This file contains the Mac implementation the download animation, displayed
   6 // at the start of a download. The animation produces an arrow pointing
   7 // downwards and animates towards the bottom of the window where the new
   8 // download appears in the download shelf.
   9
  10 #include "chrome/browser/download/download_started_animation.h"
  11
  12 #import <QuartzCore/QuartzCore.h>
  13
  14 #include "base/logging.h"
  15 #import "chrome/browser/ui/cocoa/animatable_image.h"
  16 #include "content/public/browser/web_contents.h"
  17 #include "grit/theme_resources.h"
  18 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMNSAnimation+Duration.h"
  19 #include "third_party/skia/include/utils/mac/SkCGUtils.h"
  20 #include "ui/base/resource/resource_bundle.h"
  21 #include "ui/gfx/image/image.h"
  22 #include "ui/gfx/rect.h"
  23
  24 class DownloadAnimationWebObserver;
  25
  26 // A class for managing the Core Animation download animation.
  27 // Should be instantiated using +startAnimationWithWebContents:.
  28 @interface DownloadStartedAnimationMac : NSObject {
  29  @private
  30   CGFloat imageWidth_;
  31   AnimatableImage* animation_;
  32 };
  33
  34 + (void)startAnimationWithWebContents:(content::WebContents*)webContents;
  35
  36 @end
  37
  38 @implementation DownloadStartedAnimationMac
  39
  40 - (id)initWithWebContents:(content::WebContents*)webContents {
  41   if ((self = [super init])) {
  42     // Load the image of the download arrow.
  43     ResourceBundle& bundle = ResourceBundle::GetSharedInstance();
  44     NSImage* image =
  45         bundle.GetNativeImageNamed(IDR_DOWNLOAD_ANIMATION_BEGIN).ToNSImage();
  46
  47     // Figure out the positioning in the current tab. Try to position the layer
  48     // against the left edge, and three times the download image's height from
  49     // the bottom of the tab, assuming there is enough room. If there isn't
  50     // enough, don't show the animation and let the shelf speak for itself.
  51     gfx::Rect bounds = webContents->GetContainerBounds();
  52     imageWidth_ = [image size].width;
  53     CGFloat imageHeight = [image size].height;
  54
  55     // Sanity check the size in case there's no room to display the animation.
  56     if (bounds.height() < imageHeight) {
  57       [self release];
  58       return nil;
  59     }
  60
  61     NSView* tabContentsView = webContents->GetNativeView();
  62     NSWindow* parentWindow = [tabContentsView window];
  63     if (!parentWindow) {
  64       // The tab is no longer frontmost.
  65       [self release];
  66       return nil;
  67     }
  68
  69     NSPoint origin = [tabContentsView frame].origin;
  70     origin = [tabContentsView convertPoint:origin toView:nil];
  71     origin = [parentWindow convertBaseToScreen:origin];
  72
  73     // Create the animation object to assist in animating and fading.
  74     CGFloat animationHeight = MIN(bounds.height(), 4 * imageHeight);
  75     NSRect frame = NSMakeRect(origin.x, origin.y, imageWidth_, animationHeight);
  76     animation_ = [[AnimatableImage alloc] initWithImage:image
  77                                          animationFrame:frame];
  78     [parentWindow addChildWindow:animation_ ordered:NSWindowAbove];
  79
  80     animationHeight = MIN(bounds.height(), 3 * imageHeight);
  81     [animation_ setStartFrame:CGRectMake(0, animationHeight,
  82                                          imageWidth_, imageHeight)];
  83     [animation_ setEndFrame:CGRectMake(0, imageHeight,
  84                                        imageWidth_, imageHeight)];
  85     [animation_ setStartOpacity:1.0];
  86     [animation_ setEndOpacity:0.4];
  87     [animation_ setDuration:0.6];
  88
  89     // Set up to get notified about resize events on the parent window.
  90     NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
  91     [center addObserver:self
  92                selector:@selector(parentWindowDidResize:)
  93                    name:NSWindowDidResizeNotification
  94                  object:parentWindow];
  95     // When the animation window closes, it needs to be removed from the
  96     // parent window.
  97     [center addObserver:self
  98                selector:@selector(windowWillClose:)
  99                    name:NSWindowWillCloseNotification
 100                  object:animation_];
 101     // If the parent window closes, shut everything down too.
 102     [center addObserver:self
 103                selector:@selector(windowWillClose:)
 104                    name:NSWindowWillCloseNotification
 105                  object:parentWindow];
 106   }
 107   return self;
 108 }
 109
 110 - (void)dealloc {
 111   [[NSNotificationCenter defaultCenter] removeObserver:self];
 112   [super dealloc];
 113 }
 114
 115 // Called when the parent window is resized.
 116 - (void)parentWindowDidResize:(NSNotification*)notification {
 117   NSWindow* parentWindow = [animation_ parentWindow];
 118   DCHECK([[notification object] isEqual:parentWindow]);
 119   NSRect parentFrame = [parentWindow frame];
 120   NSRect frame = parentFrame;
 121   frame.size.width = MIN(imageWidth_, NSWidth(parentFrame));
 122   [animation_ setFrame:frame display:YES];
 123 }
 124
 125 // When the animation closes, release self.
 126 - (void)windowWillClose:(NSNotification*)notification {
 127   [[animation_ parentWindow] removeChildWindow:animation_];
 128   [self release];
 129 }
 130
 131 + (void)startAnimationWithWebContents:(content::WebContents*)contents {
 132   // Will be deleted when the animation window closes.
 133   DownloadStartedAnimationMac* controller =
 134       [[self alloc] initWithWebContents:contents];
 135   // The initializer can return nil.
 136   if (!controller)
 137     return;
 138
 139   // The |controller| releases itself when done.
 140   [controller->animation_ startAnimation];
 141 }
 142
 143 @end
 144
 145 void DownloadStartedAnimation::Show(content::WebContents* web_contents) {
 146   DCHECK(web_contents);
 147
 148   // Will be deleted when the animation is complete.
 149   [DownloadStartedAnimationMac startAnimationWithWebContents:web_contents];
 150 }