void OnGridPreviewMouseMove(object sender, MouseEventArgs e)
{
if (!IsLogicBlocked)
{
if (!StartSelectionInfo.IsLeftMouseButtonPressed || StartSelectionInfo.IsEmptyInfo())
{
return;
}
if (!StartSelectionInfo.IsSelectionStarted)
{
if (!Settings.IsDragging(StartSelectionInfo.MousePoint, e.GetPosition(DataArea)))
{
return;
}
Mouse.Capture(DataArea, CaptureMode.SubTree);
StartSelectionInfo.IsSelectionStarted = true;
}
UpdateCurrentSelectionInfo();
UpdateVerticalScrolling(CurrentSelectionInfo.MousePoint);
UpdateHorizontalScrolling(CurrentSelectionInfo.MousePoint);
if (!ScrollController.IsScrollWorking)
{
UpdateSelection();
}
ScrollController.UpdateVerticalScrollTimerInterval(DataArea.ActualHeight, e.GetPosition(DataArea).Y);
ScrollController.UpdateHorizontalScrollTimerInterval(DataArea.ActualWidth, e.GetPosition(DataArea).X);
e.Handled = true;
}
}
public GridSelectingBehavior()
{
Settings = new SelectionBehaviorSettings();
StartSelectionInfo = new StartSelectionInfo();
CurrentSelectionInfo = new SelectionInfo();
ScrollController = new ScrollController(this);
ScrollController.ScrollDown += OnScrollControllerScrollDown;
ScrollController.ScrollUp += OnScrollControllerScrollUp;
ScrollController.ScrollLeft += OnScrollControllerScrollLeft;
ScrollController.ScrollRight += OnScrollControllerScrollRight;
}
void OnGridPreviewMouseDown(object sender, MouseButtonEventArgs e)
{
if (!IsLogicBlocked)
{
StartSelectionInfo.Clear();
TableViewHitInfo hitInfo = View.CalcHitInfo(e.OriginalSource as DependencyObject);
if (!hitInfo.InRow && !hitInfo.InRowCell)
{
return;
}
StartSelectionInfo.MousePoint = e.GetPosition(DataArea);
StartSelectionInfo.RowHandle = hitInfo.RowHandle;
StartSelectionInfo.Column = hitInfo.Column;
}
}
void OnGridPreviewMouseUp(object sender, MouseButtonEventArgs e)
{
if (!IsLogicBlocked)
{
if (!StartSelectionInfo.IsSelectionStarted)
{
return;
}
Mouse.Capture(null);
ScrollController.StopHorizontalScrolling();
ScrollController.StopVerticalScrolling();
StartSelectionInfo.Clear();
CurrentSelectionInfo.Clear();
e.Handled = true;
}
}