Implement basic theming for panel titlebars.

chrome/browser/ui/panels/panel_window_controller_cocoa.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_
 
 // A class acting as the Objective-C controller for the Panel window
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single titlebar and is managed/owned by Panel.
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
 #include "base/memory/scoped_ptr.h"
 
+namespace ui {
+class ThemeProvider;
+};
+
 @class FindBarCocoaController;
 class PanelBrowserWindowCocoa;
 @class PanelTitlebarViewCocoa;
 
 @interface PanelWindowControllerCocoa : NSWindowController<NSWindowDelegate> {
  @private
   IBOutlet PanelTitlebarViewCocoa* titlebar_view_;
   scoped_ptr<PanelBrowserWindowCocoa> windowShim_;
 }
 
 // Load the browser window nib and do any Cocoa-specific initialization.
 - (id)initWithBrowserWindow:(PanelBrowserWindowCocoa*)window;
 
+- (ui::ThemeProvider*)themeProvider;

[Dmitry Titov, 2011/08/25 00:08:21]

ThemedBrowserWindow looks for 3 selectors on the controller, why implement only
one? It seems at least themePatternPhase is already used in this patch. I think
themedWindowStyle will also be needed.

[dcheng, 2011/08/25 18:48:54]

We probably need all 3 eventually, but as I mentioned, I'm starting with just
the basics.

[Dmitry Titov, 2011/08/25 19:24:51]

Since you are adding plumbing in this patch, I think we should add all 3 (and a
unittest to test that they return some non-null values etc).
For example, you already use phase info in the drawing code but plumbing for it
is not complete. I agree to get more advanced painting in later patches but lets
get plumbing for themeProvider and its friends here and a test for it added to
panel_browser_window_cocoa_unittest.cc

[dcheng, 2011/08/26 23:04:42]

I've implemented the other two methods. There's some duplication in
themePatternPhase which I'm not sure how to resolve, and themedWindowStyle is
completely unused at the moment (BackgroundGradientView doesn't use it). What's
our story for incognito panels? Is it possible to have one?

+
 // Returns the TabContents' native view. It renders the content of the web page
 // in the Panel.
 - (NSView*)tabContentsView;
 
 // Sometimes (when we animate the size of the window) we want to stop resizing
 // the TabContents's cocoa view to avoid unnecessary churn and issues
 // that can be caused by sizes near 0.
 - (void)disableTabContentsViewAutosizing;
 - (void)enableTabContentsViewAutosizing;
 
 // Shows the window for the first time. Only happens once.
 - (void)revealAnimatedWithFrame:(const NSRect&)frame;
 
 // Adds the FindBar controller's view to this Panel. Must only be
 // called once per PanelWindowControllerCocoa.
 - (void)addFindBar:(FindBarCocoaController*)findBarCocoaController;
 
 // Initiate the closing of the panel, starting from the platform-independent
 // layer. This will take care of PanelManager, other panels and close the
 // native window at the end.
 - (void)closePanel;
 
 // Accessor for titlebar view.
 - (PanelTitlebarViewCocoa*)titlebarView;
 
 @end  // @interface PanelWindowController
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_WINDOW_CONTROLLER_COCOA_H_