/// <summary>
/// Called when touch up
/// </summary>
/// <param name="touchEventArgs">Touch arguments</param>
public void OnTouchUp(TouchEventArgs touchEventArgs)
{
if (this.currentTouchDisabled)
{
this.currentTouchDisabled = false;
return;
}
this.currentStartTouch = null;
if (this.cancellationTokenSource != null)
{
this.cancellationTokenSource.Cancel();
this.cancellationTokenSource = null;
}
this.TouchUp?.Invoke(this, touchEventArgs);
if (this.IsClicking)
{
this.Clicked?.Invoke(this, EventArgs.Empty);
}
this.IsClicking = false;
}
/// <summary>
/// Called when touch leave
/// </summary>
/// <param name="touchEventArgs">Touch arguments</param>
public void OnTouchLeave(TouchEventArgs touchEventArgs)
{
if (this.currentTouchDisabled)
{
return;
}
this.IsClicking = false;
this.currentStartTouch = null;
this.TouchLeave?.Invoke(this, touchEventArgs);
}
/// <summary>
/// Called when touch move
/// </summary>
/// <param name="touchEventArgs">Touch arguments</param>
public void OnTouchMove(TouchEventArgs touchEventArgs)
{
if (this.currentTouchDisabled)
{
return;
}
if (this.currentStartTouch != null && this.currentStartTouch.Position.Distance(touchEventArgs.Position) > moveTolerance)
{
this.currentStartTouch = null;
}
this.TouchMove?.Invoke(this, touchEventArgs);
}
/// <summary>
/// Called when touch is down
/// </summary>
/// <param name="touchEventArgs">Touch arguments</param>
public void OnTouchDown(TouchEventArgs touchEventArgs)
{
this.currentStartTouch = new StartTouch(touchEventArgs.Position);
this.IsClicking = true;
if (this.cancellationTokenSource != null)
{
this.cancellationTokenSource.Cancel();
this.cancellationTokenSource = null;
}
this.cancellationTokenSource = new CancellationTokenSource();
this.longPressDelayTask = Task.Delay(this.LongPressTime, cancellationTokenSource.Token);
this.longPressDelayTask.ContinueWith(t =>
{
Device.BeginInvokeOnMainThread(() =>
{
this.cancellationTokenSource = null;
if (this.currentStartTouch == null || t.IsCanceled)
{
return;
}
if (this.LongPressCancelClick)
{
this.IsClicking = false;
}
this.LongPressed?.Invoke(this, new TouchEventArgs(this.currentStartTouch.Position));
this.currentStartTouch = null;
});
});
this.TouchDown?.Invoke(this, touchEventArgs);
}
/// <summary>
/// this method disable the current tracking of a current touch device
/// </summary>
public void DisableCurrentTouch()
{
this.IsClicking = false;
this.currentStartTouch = null;
this.currentTouchDisabled = true;
}