} // ThumbPreviewMouseMove
// ----------------------------------------------------------------------
private void ThumbPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var thumb = sender as Thumb;
GridViewColumn gridViewColumn = FindParentColumn(thumb);
// suppress column resizing for proportional, fixed and range fill columns
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) ||
FixedColumn.IsFixedColumn(gridViewColumn) ||
IsFillColumn(gridViewColumn))
{
e.Handled = true;
return;
}
} // ThumbPreviewMouseLeftButtonDown
} // DoResizeColumns
// ----------------------------------------------------------------------
private void ThumbPreviewMouseMove(object sender, MouseEventArgs e)
{
var thumb = sender as Thumb;
GridViewColumn gridViewColumn = FindParentColumn(thumb);
if (gridViewColumn == null)
{
return;
}
// suppress column resizing for proportional, fixed and range fill columns
if (ProportionalColumn.IsProportionalColumn(gridViewColumn) ||
FixedColumn.IsFixedColumn(gridViewColumn) ||
IsFillColumn(gridViewColumn))
{
thumb.Cursor = null;
return;
}
// check range column bounds
if (thumb.IsMouseCaptured && RangeColumn.IsRangeColumn(gridViewColumn))
{
double?minWidth = RangeColumn.GetRangeMinWidth(gridViewColumn);
double?maxWidth = RangeColumn.GetRangeMaxWidth(gridViewColumn);
if ((minWidth.HasValue && maxWidth.HasValue) && (minWidth > maxWidth))
{
return; // invalid case
}
if (resizeCursor == null)
{
resizeCursor = thumb.Cursor; // save the resize cursor
}
if (minWidth.HasValue && gridViewColumn.Width <= minWidth.Value)
{
thumb.Cursor = Cursors.No;
}
else if (maxWidth.HasValue && gridViewColumn.Width >= maxWidth.Value)
{
thumb.Cursor = Cursors.No;
}
else
{
thumb.Cursor = resizeCursor; // between valid min/max
}
}
} // ThumbPreviewMouseMove