Mac: Add tooltip to download item.

chrome/browser/cocoa/download_item_controller.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/download_item_controller.h"
 
 #include "app/l10n_util_mac.h"
 #include "app/resource_bundle.h"
 #include "app/text_elider.h"
 #include "base/mac_util.h"
@@ skipping 18 matching lines @@
 // NOTE: Mac currently doesn't use this like Windows does.  Mac uses this to
 // control the min size on the dangerous download text.  TVL sent a query off to
 // UX to fully spec all the the behaviors of download items and truncations
 // rules so all platforms can get inline in the future.
 const int kTextWidth = 140;            // Pixels
 
 // The maximum number of characters we show in a file name when displaying the
 // dangerous download message.
 const int kFileNameMaxLength = 20;
 
+// The maximum width in pixels for the file name tooltip.
+const int kToolTipMaxWidth = 900;
+
+
 // Helper to widen a view.
 void WidenView(NSView* view, CGFloat widthChange) {
   // If it is an NSBox, the autoresize of the contentView is the issue.
   NSView* contentView = view;
   if ([view isKindOfClass:[NSBox class]]) {
     contentView = [(NSBox*)view contentView];
   }
   BOOL autoresizesSubviews = [contentView autoresizesSubviews];
   if (autoresizesSubviews) {
     [contentView setAutoresizesSubviews:NO];
@@ skipping 94 matching lines @@
   NSPoint frameOrigin = [buttonTweaker_ frame].origin;
   frameOrigin.x += widthChange;
   [buttonTweaker_ setFrameOrigin:frameOrigin];
 
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   NSImage* alertIcon = rb.GetNSImageNamed(IDR_WARNING);
   DCHECK(alertIcon);
   [image_ setImage:alertIcon];
 
   bridge_->LoadIcon();
+  [self updateToolTip];
 }
 
 - (void)setStateFromDownload:(BaseDownloadItemModel*)downloadModel {
   DCHECK_EQ(bridge_->download_model(), downloadModel);
 
   // Handle dangerous downloads.
   if (downloadModel->download()->safety_state() == DownloadItem::DANGEROUS) {
     [self setState:kDangerous];
 
     NSString* dangerousWarning;
@@ skipping 84 matching lines @@
   if (state_ == kNormal)
     return [progressView_ frame].size;
   DCHECK_EQ(kDangerous, state_);
   return [dangerousDownloadView_ frame].size;
 }
 
 - (DownloadItem*)download {
   return bridge_->download_model()->download();
 }
 
+- (void)updateToolTip {
+  std::wstring elidedFilename = gfx::ElideFilename(
+      [self download]->GetFileName(),
+      gfx::Font(), kToolTipMaxWidth);
+  [progressView_ setToolTip:base::SysWideToNSString(elidedFilename)];
+}
+
 - (void)clearDangerousMode {
   [self setState:kNormal];
   // The state change hide the dangerouse download view and is now showing the
   // download progress view.  This means the view is likely to be a different
   // size, so trigger a shelf layout to fix up spacing.
   [shelf_ layoutItems];
 }
 
 - (BOOL)isDangerousMode {
   return state_ == kDangerous;
@@ skipping 105 matching lines @@
     [sender setTitle:l10n_util::GetNSStringWithFixup(
         IDS_DOWNLOAD_MENU_PAUSE_ITEM)];
   } else {
     [sender setTitle:l10n_util::GetNSStringWithFixup(
         IDS_DOWNLOAD_MENU_RESUME_ITEM)];
   }
   menuBridge_->ExecuteCommand(DownloadShelfContextMenuMac::TOGGLE_PAUSE);
 }
 
 @end