Gradient overlay for constrained window

chrome/renderer/webview_animating_overlay.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.

[Nico, 2012/08/14 21:14:12]

I know, it's crazy how time flies when you're having a good time. But it's 2012
already.

[sail, 2012/08/15 05:26:20]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_RENDERER_WEBVIEW_ANIMATING_OVERLAY_H_
+#define CHROME_RENDERER_WEBVIEW_ANIMATING_OVERLAY_H_
+
+#include "base/basictypes.h"

[Nico, 2012/08/14 21:14:12]

not needed

[sail, 2012/08/15 05:26:20]

Done.

+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"

[Nico, 2012/08/14 21:14:12]

not needed

[sail, 2012/08/15 05:26:20]

Done.

+#include "base/time.h"
+#include "base/timer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPageOverlay.h"
+
+namespace content {
+class RenderView;
+}
+
+// This class draws a gradient on a PageOverlay of a WebView. The gradient
+// fades in when shown and fades out when hidden.
+class WebViewAnimatingOverlay : public WebKit::WebPageOverlay {
+ public:
+  enum State {
+    ANIMATING_IN,
+    VISIBLE,
+    ANIMATING_OUT,
+    HIDDEN
+  };
+
+  explicit WebViewAnimatingOverlay(content::RenderView* render_view);
+  virtual ~WebViewAnimatingOverlay();
+  void Show();
+  void Hide();
+
+  State state() { return state_; }
+
+  // WebKit::WebPageOverlay implementation:
+  virtual void paintPageOverlay(WebKit::WebCanvas* canvas) OVERRIDE;
+
+ private:
+  void OnTimer();
+  base::TimeDelta GetAnimationTimeRemaining() const;
+  float GetAnimationProgress() const;
+
+  content::RenderView* render_view_;
+  State state_;
+  base::RepeatingTimer<WebViewAnimatingOverlay> timer_;
+  base::Time start_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebViewAnimatingOverlay);
+};
+
+#endif  // CHROME_RENDERER_WEBVIEW_ANIMATING_OVERLAY_H_