| // Copyright 2016 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 REMOTING_CLIENT_DISPLAY_DRAWABLE_H_ |
| #define REMOTING_CLIENT_DISPLAY_DRAWABLE_H_ |
| |
| #include "base/macros.h" |
| #include "base/memory/weak_ptr.h" |
| |
| namespace remoting { |
| |
| class Canvas; |
| |
| // Interface for drawing on a Canvas from a renderer. |
| class Drawable { |
| public: |
| Drawable() {} |
| virtual ~Drawable() {} |
| |
| // Sets the canvas on which the object will be drawn. |
| // If |canvas| is nullptr, nothing will happen when calling Draw(). |
| virtual void SetCanvas(base::WeakPtr<Canvas> canvas) = 0; |
| |
| // Draws the object on the canvas. |
| // Returns true if there is a pending next frame. |
| virtual bool Draw() = 0; |
| |
| // Used for the renderer to keep a stack of drawables. |
| virtual base::WeakPtr<Drawable> GetWeakPtr() = 0; |
| |
| // ZIndex is a recommendation for Z Index of drawable components. |
| enum ZIndex { |
| DESKTOP = 100, |
| CURSOR_FEEDBACK = 200, |
| CURSOR = 300, |
| }; |
| |
| // A higher Z Index shiould be draw ontop of a lower z index. Elements with |
| // the same Z Index should draw in order inserted into the renderer. |
| virtual int GetZIndex() = 0; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(Drawable); |
| }; |
| |
| } // namespace remoting |
| |
| #endif // REMOTING_CLIENT_DISPLAY_DRAWABLE_H_ |