Add a lock screen example.

ui/aura_shell/examples/lock_view.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/desktop.h"
+#include "ui/aura/window.h"
+#include "ui/aura_shell/examples/example_factory.h"
+#include "ui/aura_shell/shell_window_ids.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/font.h"
+#include "views/widget/widget.h"
+#include "views/widget/widget_delegate.h"
+
+namespace aura_shell {
+namespace examples {
+
+class LockView : public views::WidgetDelegateView {
+ public:
+  LockView() {
+  }
+  virtual ~LockView() {}
+
+  // Overridden from View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE {
+    return gfx::Size(500, 400);
+  }
+
+ private:
+  // Overridden from View:
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
+    canvas->FillRectInt(SK_ColorYELLOW, 0, 0, width(), height());
+    string16 text = L"LOCKED!";
+    int string_width = font_.GetStringWidth(text);
+    canvas->DrawStringInt(text, font_, SK_ColorRED, (width() - string_width)/ 2,
+                          (height() - font_.GetHeight()) / 2,
+                          string_width, font_.GetHeight());
+  }
+  virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE {
+    return true;
+  }
+  virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE {
+    GetWidget()->Close();
+  }
+
+  gfx::Font font_;
+
+  DISALLOW_COPY_AND_ASSIGN(LockView);
+};
+
+void CreateLock() {
+  LockView* lock_view = new LockView;
+  views::Widget* widget = new views::Widget;
+  views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
+  gfx::Size ps = lock_view->GetPreferredSize();
+
+  gfx::Rect desktop_bounds = aura::Desktop::GetInstance()->window()->bounds();
+  params.bounds = gfx::Rect((desktop_bounds.width() - ps.width()) / 2,
+                            (desktop_bounds.height() - ps.height()) / 2,
+                            ps.width(), ps.height());
+  params.delegate = lock_view;
+  params.parent = aura::Desktop::GetInstance()->window()->GetChildById(
+      aura_shell::internal::kShellWindowId_LockScreenContainer);
+  widget->Init(params);
+  widget->SetContentsView(lock_view);
+  widget->Show();
+  widget->GetNativeView()->set_name("LockView");
+}
+
+}  // namespace examples
+}  // namespace aura_shell