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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
namespace Tango.Touch.Controls
{
public class TouchThumb : Thumb
{
private TouchDevice currentDevice = null;
protected override void OnPreviewTouchDown(TouchEventArgs e)
{
// Release any previous capture
ReleaseCurrentDevice();
// Capture the new touch
CaptureCurrentDevice(e);
}
protected override void OnPreviewTouchUp(TouchEventArgs e)
{
ReleaseCurrentDevice();
}
protected override void OnLostTouchCapture(TouchEventArgs e)
{
// Only re-capture if the reference is not null
// This way we avoid re-capturing after calling ReleaseCurrentDevice()
if (currentDevice != null)
{
CaptureCurrentDevice(e);
}
}
private void ReleaseCurrentDevice()
{
if (currentDevice != null)
{
// Set the reference to null so that we don't re-capture in the OnLostTouchCapture() method
var temp = currentDevice;
currentDevice = null;
ReleaseTouchCapture(temp);
}
}
private void CaptureCurrentDevice(TouchEventArgs e)
{
bool gotTouch = CaptureTouch(e.TouchDevice);
if (gotTouch)
{
currentDevice = e.TouchDevice;
}
}
}
}
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