Now that the launcher is sized to the width of the root window we need

ui/aura_shell/launcher/launcher.cc

 // 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.
 
 #include "ui/aura_shell/launcher/launcher.h"
 
+#include "grit/ui_resources.h"
 #include "ui/aura/window.h"
 #include "ui/aura_shell/launcher/launcher_model.h"
 #include "ui/aura_shell/launcher/launcher_view.h"
 #include "ui/aura_shell/shell.h"
 #include "ui/aura_shell/shell_delegate.h"
 #include "ui/aura_shell/shell_window_ids.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/canvas.h"
 #include "ui/gfx/compositor/layer.h"
+#include "ui/gfx/image/image.h"
+#include "ui/views/painter.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura_shell {
 
+namespace {
+
+// Used to draw the background of the shelf.
+class ShelfPainter : public views::Painter {
+ public:
+  ShelfPainter() {
+    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+    image_ = *rb.GetImageNamed(IDR_AURA_LAUNCHER_BACKGROUND).ToSkBitmap();
+  }
+
+  virtual void Paint(int w, int h, gfx::Canvas* canvas) OVERRIDE {
+    canvas->TileImageInt(image_, 0, 0, w, h);
+  }
+
+ private:
+  SkBitmap image_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShelfPainter);
+};
+
+}  // namespace
+
+// The contents view of the Widget. This view contains LauncherView and
+// sizes it to the width of the widget minus the size of the status area.
+class Launcher::DelegateView : public views::WidgetDelegateView {
+ public:
+  explicit DelegateView();
+  virtual ~DelegateView();
+
+  void SetStatusWidth(int width);
+  int status_width() const { return status_width_; }
+
+  // views::View overrides
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+
+ private:
+  int status_width_;
+
+  DISALLOW_COPY_AND_ASSIGN(DelegateView);
+};
+
+Launcher::DelegateView::DelegateView()
+    : status_width_(0) {
+  set_background(
+      views::Background::CreateBackgroundPainter(true, new ShelfPainter()));
+}
+
+Launcher::DelegateView::~DelegateView() {
+}
+
+void Launcher::DelegateView::SetStatusWidth(int width) {
+  if (status_width_ == width)
+    return;
+
+  status_width_ = width;
+  Layout();
+}
+
+gfx::Size Launcher::DelegateView::GetPreferredSize() {
+  return child_count() > 0 ? child_at(0)->GetPreferredSize() : gfx::Size();
+}
+
+void Launcher::DelegateView::Layout() {
+  if (child_count() == 0)
+    return;
+  child_at(0)->SetBounds(0, 0, std::max(0, width() - status_width_), height());
+}
+
 Launcher::Launcher(aura::Window* window_container)
     : widget_(NULL),
-      window_container_(window_container) {
+      window_container_(window_container),
+      delegate_view_(NULL) {
   window_container->AddObserver(this);
 
   model_.reset(new LauncherModel);
 
   widget_ = new views::Widget;
   views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
   params.create_texture_for_layer = true;
   params.transparent = true;
   params.parent = Shell::GetInstance()->GetContainer(
       aura_shell::internal::kShellWindowId_LauncherContainer);
   internal::LauncherView* launcher_view =
       new internal::LauncherView(model_.get());
   launcher_view->Init();
-  params.delegate = launcher_view;
+  delegate_view_ = new DelegateView;
+  delegate_view_->AddChildView(launcher_view);
+  params.delegate = delegate_view_;
   widget_->Init(params);
   gfx::Size pref = static_cast<views::View*>(launcher_view)->GetPreferredSize();
   widget_->SetBounds(gfx::Rect(0, 0, pref.width(), pref.height()));
-  widget_->SetContentsView(launcher_view);
+  widget_->SetContentsView(delegate_view_);
   widget_->Show();
   widget_->GetNativeView()->SetName("LauncherView");
 }
 
 Launcher::~Launcher() {
   widget_->CloseNow();
   window_container_->RemoveObserver(this);
   for (WindowMap::iterator i = known_windows_.begin();
        i != known_windows_.end(); ++i) {
     i->first->RemoveObserver(this);
   }
 }
 
+void Launcher::SetStatusWidth(int width) {
+  delegate_view_->SetStatusWidth(width);
+}
+
+int Launcher::GetStatusWidth() {
+  return delegate_view_->status_width();
+}
+
 void Launcher::MaybeAdd(aura::Window* window) {
   if (known_windows_[window] == true)
     return;  // We already tried to add this window.
 
   known_windows_[window] = true;
   ShellDelegate* delegate = Shell::GetInstance()->delegate();
   if (!delegate)
     return;
   LauncherItem item;
   item.window = window;
@@ skipping 27 matching lines @@
     model_->RemoveItemAt(i - model_->items().begin());
 }
 
 void Launcher::OnWindowVisibilityChanged(aura::Window* window,
                                          bool visibile) {
   if (visibile && !known_windows_[window])
     MaybeAdd(window);
 }
 
 }  // namespace aura_shell