1 files changed, 77 insertions, 0 deletions
diff --git a/chrome/browser/gtk/infobar_arrow_model.h b/chrome/browser/gtk/infobar_arrow_model.h
new file mode 100644
index 0000000..369e586
--- /dev/null
+++ b/chrome/browser/gtk/infobar_arrow_model.h
@@ -0,0 +1,77 @@
+// Copyright (c) 2010 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_GTK_INFOBAR_ARROW_MODEL_H_
+#define CHROME_BROWSER_GTK_INFOBAR_ARROW_MODEL_H_
+
+#include <gtk/gtk.h>
+
+#include "app/slide_animation.h"
+#include "third_party/skia/include/core/SkPaint.h"
+
+namespace gfx {
+class Point;
+}
+
+class InfoBar;
+
+// A helper class that tracks the state of an infobar arrow and provides a
+// utility to draw it.
+class InfoBarArrowModel : public AnimationDelegate {
+ public:
+  class Observer {
+   public:
+    // The arrow has changed states; relevant widgets need to be repainted.
+    virtual void PaintStateChanged() = 0;
+  };
+
+  explicit InfoBarArrowModel(Observer* observer);
+  virtual ~InfoBarArrowModel();
+
+  // An infobar has been added or removed that will affect the state of this
+  // arrow.
+  void ShowArrowFor(InfoBar* bar, bool animate);
+
+  // Returns true if the arrow is showing at all.
+  bool NeedToDrawInfoBarArrow();
+
+  // Paints the arrow on |widget|, in response to |expose|, with the bottom
+  // center of the arrow at |origin|, drawing a border with |border_color|.
+  void Paint(GtkWidget* widget,
+             GdkEventExpose* expose,
+             const gfx::Point& origin,
+             const GdkColor& border_color);
+
+  // Overridden from AnimationDelegate.
+  virtual void AnimationEnded(const Animation* animation);
+  virtual void AnimationProgressed(const Animation* animation);
+  virtual void AnimationCanceled(const Animation* animation);
+
+ private:
+  // A pair of colors used to draw a gradient for an arrow.
+  struct InfoBarColors {
+    SkColor top;
+    SkColor bottom;
+  };
+
+  // Calculates the currently showing arrow color, which is a blend of the new
+  // arrow color and the old arrow color.
+  InfoBarColors CurrentInfoBarColors();
+
+  // The view that owns us.
+  Observer* observer_;
+
+  // An animation that tracks the progress of the transition from the last color
+  // to the new color.
+  SlideAnimation animation_;
+
+  // The color we are animating towards.
+  InfoBarColors target_colors_;
+  // The last color we showed (the one we are animating away from).
+  InfoBarColors previous_colors_;
+
+  DISALLOW_COPY_AND_ASSIGN(InfoBarArrowModel);
+};
+
+#endif  // CHROME_BROWSER_GTK_INFOBAR_ARROW_MODEL_H_