cc/CCTimeSource.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CCTimeSource_h
   6 #define CCTimeSource_h
   7
   8 #include <wtf/RefCounted.h>
   9
  10 namespace WebCore {
  11
  12 class CCThread;
  13
  14 class CCTimeSourceClient {
  15 public:
  16     virtual void onTimerTick() = 0;
  17
  18 protected:
  19     virtual ~CCTimeSourceClient() { }
  20 };
  21
  22 // An generic interface for getting a reliably-ticking timesource of
  23 // a specified rate.
  24 //
  25 // Be sure to call setActive(false) before releasing your reference to the
  26 // timer, or it will keep on ticking!
  27 class CCTimeSource : public RefCounted<CCTimeSource> {
  28 public:
  29     virtual ~CCTimeSource() { }
  30     virtual void setClient(CCTimeSourceClient*) = 0;
  31     virtual void setActive(bool) = 0;
  32     virtual bool active() const = 0;
  33     virtual void setTimebaseAndInterval(double timebase, double intervalSeconds) = 0;
  34     virtual double lastTickTime() = 0;
  35     virtual double nextTickTimeIfActivated() = 0;
  36 };
  37
  38 }
  39 #endif // CCSmoothedTimer_h