private void SavedCityInfoDataGrid_OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
Point point = e.GetPosition(SavedCityInfoDataGrid);
HitTestResult result = VisualTreeHelper.HitTest(SavedCityInfoDataGrid, point);
if (result == null)
{
return;
}
Button button = VisualHelper.FindParentOfType <Button>(result.VisualHit);
_isDragFlag = button == null ? true : false;
}
private void SavedCityInfoDataGrid_OnDragEnter(object sender, DragEventArgs e)
{
Point point = e.GetPosition(SavedCityInfoDataGrid);
HitTestResult result = VisualTreeHelper.HitTest(SavedCityInfoDataGrid, point);
if (result != null)
{
DataGridRow row = VisualHelper.FindParentOfType <DataGridRow>(result.VisualHit);
if (row == null)
{
return;
}
_currentMouseOverItem = row.DataContext as CityInfo;
e.Effects = _currentMouseOverItem != null ? DragDropEffects.Move : DragDropEffects.None;
}
}