blob: 3b8180b4ea65b806a4eb31c863fa83aff974cfb8 [file] [log] [blame]
// 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.
#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 {
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 = 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;
} // namespace remoting