Detect removed files and reflect the state in chrome://downloads and the download shelf

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

 // Copyright (c) 2011 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/ui/cocoa/download/download_item_cell.h"
 
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/download/download_item.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_manager.h"
@@ skipping 50 matching lines @@
 // Width of dropdown arrow.
 const CGFloat kDropdownArrowWidth = 5;
 
 // Height of dropdown arrow.
 const CGFloat kDropdownArrowHeight = 3;
 
 // Vertical displacement of dropdown area, relative to the "centered" position.
 const CGFloat kDropdownAreaY = -2;
 
 // Duration of the two-lines-to-one-line animation, in seconds.
+NSTimeInterval kShowStatusDuration = 0.3;
 NSTimeInterval kHideStatusDuration = 0.3;
 
 // Duration of the 'download complete' animation, in seconds.
 const int kCompleteAnimationDuration = 2.5;
 
 // Duration of the 'download interrupted' animation, in seconds.
 const int kInterruptedAnimationDuration = 2.5;
 
 // This is a helper class to animate the fading out of the status text.
 @interface DownloadItemCellAnimation : NSAnimation {
   DownloadItemCell* cell_;
 }
 - (id)initWithDownloadItemCell:(DownloadItemCell*)cell
                       duration:(NSTimeInterval)duration
                 animationCurve:(NSAnimationCurve)animationCurve;
 @end
 
 @interface DownloadItemCell(Private)
 - (void)updateTrackingAreas:(id)sender;
+- (void)showSecondaryTitle;
 - (void)hideSecondaryTitle;
 - (void)animation:(NSAnimation*)animation
        progressed:(NSAnimationProgress)progress;
 - (NSString*)elideTitle:(int)availableWidth;
 - (NSString*)elideStatus:(int)availableWidth;
 - (ui::ThemeProvider*)backgroundThemeWrappingProvider:
     (ui::ThemeProvider*)provider;
 - (BOOL)pressedWithDefaultThemeOnPart:(DownloadItemMousePosition)part;
 - (NSColor*)titleColorForPart:(DownloadItemMousePosition)part;
 - (void)drawSecondaryTitleInRect:(NSRect)innerFrame;
@@ skipping 35 matching lines @@
   if ((self = [super initTextCell:string])) {
     [self setInitialState];
   }
   return self;
 }
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   if ([completionAnimation_ isAnimating])
     [completionAnimation_ stopAnimation];
+  if ([showStatusAnimation_ isAnimating])
+    [showStatusAnimation_ stopAnimation];
   if ([hideStatusAnimation_ isAnimating])
     [hideStatusAnimation_ stopAnimation];
   if (trackingAreaButton_) {
     [[self controlView] removeTrackingArea:trackingAreaButton_];
     trackingAreaButton_.reset();
   }
   if (trackingAreaDropdown_) {
     [[self controlView] removeTrackingArea:trackingAreaDropdown_];
     trackingAreaDropdown_.reset();
   }
   [secondaryTitle_ release];
   [secondaryFont_ release];
   [super dealloc];
 }
 
 - (void)setStateFromDownload:(BaseDownloadItemModel*)downloadModel {
   // Set the name of the download.
   downloadPath_ = downloadModel->download()->GetFileNameToReportUser();
 
   string16 statusText = downloadModel->GetStatusText();
   if (statusText.empty()) {
     // Remove the status text label.
     [self hideSecondaryTitle];
     isStatusTextVisible_ = NO;
   } else {
     // Set status text.
     NSString* statusString = base::SysUTF16ToNSString(statusText);
     [self setSecondaryTitle:statusString];
+    [self showSecondaryTitle];
     isStatusTextVisible_ = YES;
   }
 
   switch (downloadModel->download()->state()) {
     case DownloadItem::COMPLETE:
       // Small downloads may start in a complete state due to asynchronous
       // notifications. In this case, we'll get a second complete notification
       // via the observers, so we ignore it and avoid creating a second complete
       // animation.
       if (completionAnimation_.get())
@@ skipping 403 matching lines @@
   [triangle fill];
 }
 
 - (NSRect)imageRectForBounds:(NSRect)cellFrame {
   return NSMakeRect(cellFrame.origin.x + kImagePaddingLeft,
                     cellFrame.origin.y + kImagePaddingTop,
                     kImageWidth,
                     kImageHeight);
 }
 
+- (void)showSecondaryTitle {
+  if (!isStatusTextVisible_) {
+    // No core animation -- text in CA layers is not subpixel antialiased :-/
+    showStatusAnimation_.reset([[DownloadItemCellAnimation alloc]
+        initWithDownloadItemCell:self
+                        duration:kShowStatusDuration
+                  animationCurve:NSAnimationEaseIn]);
+    [showStatusAnimation_.get() setDelegate:self];
+    [showStatusAnimation_.get() startAnimation];
+  } else {
+    // If the status line continues to be visible, don't show an animation
+    [self animation:nil progressed:0.0];
+  }
+}
+
 - (void)hideSecondaryTitle {
   if (isStatusTextVisible_) {
     // No core animation -- text in CA layers is not subpixel antialiased :-/
     hideStatusAnimation_.reset([[DownloadItemCellAnimation alloc]
         initWithDownloadItemCell:self
                         duration:kHideStatusDuration
                   animationCurve:NSAnimationEaseIn]);
     [hideStatusAnimation_.get() setDelegate:self];
     [hideStatusAnimation_.get() startAnimation];
   } else {
     // If the download is done so quickly that the status line is never visible,
     // don't show an animation
     [self animation:nil progressed:1.0];
   }
 }
 
 - (void)animation:(NSAnimation*)animation
       progressed:(NSAnimationProgress)progress {
-  if (animation == hideStatusAnimation_ || animation == nil) {
+  if (animation == showStatusAnimation_) {
+    titleY_ = (1 - progress)*kPrimaryTextOnlyPosTop +
+      kPrimaryTextPosTop;
+    statusAlpha_ = progress;
+    [[self controlView] setNeedsDisplay:YES];
+  } else if (animation == hideStatusAnimation_ || animation == nil) {
     titleY_ = progress*kPrimaryTextOnlyPosTop +
         (1 - progress)*kPrimaryTextPosTop;
     statusAlpha_ = 1 - progress;
     [[self controlView] setNeedsDisplay:YES];
   } else if (animation == completionAnimation_) {
     [[self controlView] setNeedsDisplay:YES];
   }
 }
 
 - (void)animationDidEnd:(NSAnimation *)animation {
-  if (animation == hideStatusAnimation_)
+  if (animation == showStatusAnimation_)
+    showStatusAnimation_.reset();
+  else if (animation == hideStatusAnimation_)
     hideStatusAnimation_.reset();
   else if (animation == completionAnimation_)
     completionAnimation_.reset();
 }
 
 @end
 
 @implementation DownloadItemCellAnimation
 
 - (id)initWithDownloadItemCell:(DownloadItemCell*)cell
                       duration:(NSTimeInterval)duration
                 animationCurve:(NSAnimationCurve)animationCurve {
   if ((self = [super gtm_initWithDuration:duration
                                 eventMask:NSLeftMouseDownMask
                            animationCurve:animationCurve])) {
     cell_ = cell;
     [self setAnimationBlockingMode:NSAnimationNonblocking];
   }
   return self;
 }
 
 - (void)setCurrentProgress:(NSAnimationProgress)progress {
   [super setCurrentProgress:progress];
   [cell_ animation:self progressed:progress];
 }
 
 @end