public ProgressBarViewModel()
{
this.state = InternalProgressBarState.Disabled;
this.lockObject = new object();
this.timer = new DispatcherTimer();
this.timer.Tick += this.OnTimer;
}
private void ChangeState(bool enable)
{
lock (this.lockObject)
{
switch (this.state)
{
case InternalProgressBarState.Disabled:
if (enable)
{
this.state = InternalProgressBarState.EnablePending;
// start the enable delay timer
this.timer.Interval = new TimeSpan(0, 0, ENABLEDELAY);
this.timer.Start();
}
break;
case InternalProgressBarState.EnablePending:
if (!enable)
{
this.state = InternalProgressBarState.Disabled;
// stop the enable delay timer
this.timer.Stop();
}
break;
case InternalProgressBarState.Enabled:
if (!enable)
{
this.state = InternalProgressBarState.DisablePending;
}
break;
case InternalProgressBarState.OkToDisable:
if (!enable)
{
this.state = InternalProgressBarState.Disabled;
}
break;
case InternalProgressBarState.DisablePending:
if (enable)
{
this.state = InternalProgressBarState.Enabled;
}
break;
}
}
this.RaisePropertyChanged("ProgressBarState");
}
private void OnTimer(object o, EventArgs sender)
{
lock (this.lockObject)
{
switch (this.state)
{
case InternalProgressBarState.EnablePending:
// Stop the enable delay timer
this.state = InternalProgressBarState.Enabled;
this.timer.Stop();
// Start the disable delay timer
this.timer.Interval = new TimeSpan(0, 0, DISABLEDELAY);
this.timer.Start();
break;
case InternalProgressBarState.Enabled:
this.state = InternalProgressBarState.OkToDisable;
this.timer.Stop();
break;
case InternalProgressBarState.DisablePending:
this.state = InternalProgressBarState.Disabled;
this.timer.Stop();
break;
default:
Debug.Assert(true, "Progress bar state is incorrect on timer tick: " + this.state);
this.state = InternalProgressBarState.Disabled;
this.timer.Stop();
break;
}
}
this.RaisePropertyChanged("ProgressBarState");
}
