private void TraceCurrentMousePoint(MouseEventArgs e)
{
var currentPoint = LayerContainer.GetMousePosition(true);
// 防止 currentPoint 不让其超出控件 renderSize 范围
var x = Math.Max(currentPoint.X, 0);
var y = Math.Max(currentPoint.Y, 0);
var startAutoScrollTimer = false;
if (_autoScrollTimer == null || !_autoScrollTimer.IsEnabled)
{
startAutoScrollTimer = AutoScroll();
}
if (startAutoScrollTimer)
{
_autoScrollTimer = new DispatcherTimer {
Interval = TimeSpan.FromSeconds(0.3)
};
_autoScrollTimer.Tick += delegate
{
if (e.LeftButton == MouseButtonState.Pressed && AutoScroll())
{
SetCurrentMousePoint(e);
MeasureDragingArea(_screenDataRowIndex);
return;
}
LayerContainer.ReleaseMouseCapture();
_autoScrollTimer.Stop();
};
_autoScrollTimer.Start();
}
_currentPoint = new Point(x, y);
}