private void ColumnsGrid_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
double prefScaleFactor = InternalScaleFactor;
double scaleFactor = e.DeltaManipulation.Scale.Y;
if (scaleFactor != 1.0)
{
InternalScaleFactor *= scaleFactor;
//System.Diagnostics.Debug.WriteLine("scale changed by {0:0.0000} to {1:0.##}", scaleFactor, InternalScaleFactor);
}
double newScaleFactor = InternalScaleFactor;
//System.Diagnostics.Debug.WriteLine("scale changed by {2} to {0}, trandlation changed to {1}", InternalScaleFactor, e.DeltaManipulation.Translation.Y,factor);
var wpfMo = ColumnsGrid.PointFromScreen(new Point(0.0, e.ManipulationOrigin.Y));//as manipulation origin is in screen coods
double mo = wpfMo.Y;
double startOffset = GridScroll.VerticalOffset;
double shift = -e.DeltaManipulation.Translation.Y;
//double startOffsetInScreen = ColumnsGrid.PointToScreen(new Point(0.0, GridScroll.VerticalOffset)).Y;
//double endOffsetInScreen = startOffset/prefScaleFactor + shi;
double endOffsetInWPF = scaleFactor * (startOffset + shift);
//double newOffset1 = (startOffset-mo+shift)*scaleFactor + mo;
//System.Diagnostics.Debug.WriteLine("screen mo is {0}; offset {1}l wpf mo is {2}",mo,startOffset, wpfMo.Y);
GridScroll.ScrollToVerticalOffset(endOffsetInWPF);
e.Handled = true;
}
private void ColumnsGrid_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
dragColumn = (String)ColumnsGrid.CurrentCell.Value;
if (dragColumn != null)
{
ColumnsGrid.DoDragDrop(dragColumn, DragDropEffects.Copy);
}
}
}