Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/panel.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/panels/panel.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 32 matching lines @@
       web_app::GetExtensionIdFromApplicationName(browser->app_name()), false);
 }
 
 Panel::Panel(Browser* browser, const gfx::Size& requested_size)
     : browser_(browser),
       panel_strip_(NULL),
       initialized_(false),
       has_temporary_layout_(false),
       restored_size_(requested_size),
       auto_resizable_(false),
+      always_on_top_(false),
+      in_preview_mode_(false),
       expansion_state_(EXPANDED),
-      old_expansion_state_(EXPANDED),
-      app_icon_visible_(true) {
+      old_expansion_state_(EXPANDED) {
 }
 
 Panel::~Panel() {
   // Invoked by native panel destructor. Do not access native_panel_ here.
 }
 
 void Panel::Initialize(const gfx::Rect& bounds) {
   DCHECK(!initialized_);
   DCHECK(!bounds.IsEmpty());
   initialized_ = true;
@@ skipping 78 matching lines @@
 
   DCHECK(min_size.width() <= max_size.width());
   DCHECK(min_size.height() <= max_size.height());
   min_size_ = min_size;
   max_size_ = max_size;
 
   ConfigureAutoResize(browser()->GetSelectedWebContents());
 }
 
 void Panel::SetAppIconVisibility(bool visible) {
-  if (app_icon_visible_ == visible)
+  native_panel_->SetPanelAppIconVisibility(visible);
+}
+
+void Panel::SetAlwaysOnTop(bool on_top) {
+  if (always_on_top_ == on_top)
     return;
-  app_icon_visible_ = visible;
-  native_panel_->SetPanelAppIconVisibility(visible);
+  always_on_top_ = on_top;
+  native_panel_->SetPanelAlwaysOnTop(on_top);

[Andrei, 2012/03/07 22:55:13]

Actually the native panel needs to be on top iff always_on_top_ ||
in_preview_mode_

[jianli, 2012/03/08 01:18:26]

Per suggestion from Jenn, we're not going to make dragging panel always visible
for now.

+}
+
+void Panel::SetPreviewMode(bool in_preview) {
+  DCHECK_NE(in_preview_mode_, in_preview);
+  in_preview_mode_ = in_preview;
 }
 
 void Panel::SetExpansionState(ExpansionState new_state) {
   if (expansion_state_ == new_state)
     return;
   old_expansion_state_ = expansion_state_;
   expansion_state_ = new_state;
 
   manager()->OnPanelExpansionStateChanged(this);
 
@@ skipping 510 matching lines @@
       native_panel_->ContentSizeFromWindowSize(max_size_));
 }
 
 void Panel::OnWindowSizeAvailable() {
   ConfigureAutoResize(browser()->GetSelectedWebContents());
 }
 
 void Panel::DestroyBrowser() {
   native_panel_->DestroyPanelBrowser();
 }