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Ticket T1284656
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Re: MultiRow select not working with Shift/Ctrl + click?

created 6 days ago

Dear Support,

further to the ticket https://supportcenter.devexpress.com/ticket/details/t900302, here is an alternative implementation, that allows a bit more flexibility!

With this code, you can do the usual 2 steps range selection:

  • 1 select the start row without pressing Shift
  • 2 select the end row pressing Shift and ending selecting the range
Code
private int _startRowHandle;

private void GridControl_OnPreviewMouseDown(object sender,
                                          MouseButtonEventArgs e)
{
    if (e.ChangedButton != MouseButton.Left)
        return;

    TableView view = (TableView)sender;
    GridControl grid = (GridControl)view.Parent;

    TableViewHitInfo hitTest;

    if (Keyboard.Modifiers != ModifierKeys.Shift)
    {
        hitTest = view.CalcHitInfo(e.GetPosition(view));
        if (hitTest.InRow)
        {
            _startRowHandle = hitTest.RowHandle;
            return;
        }
    }

    if (Keyboard.Modifiers != ModifierKeys.Shift)
        return;

    hitTest = view.CalcHitInfo(e.GetPosition(view));
    if (hitTest.InRow)
        grid.SelectRange(_startRowHandle, hitTest.RowHandle);
}
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Answers approved by DevExpress Support

created 5 days ago

Hello Stephan,

Thank you for sharing your solution and making it public.

As an additional alternative, it is possible to handle the PreviewMouseDown event at the parent container level and utilize GridControl's CurrentItem instead of SelectedItem. In this case, the operation will be processed before CurrentItem is updated.

XAML
<Grid PreviewMouseDown="UIElement_OnPreviewMouseDown">
    <dxg:GridControl x:Name="grid" ItemsSource="{Binding Source}" SelectionMode="MultipleRow" >





C#
private void UIElement_OnPreviewMouseDown(object sender, MouseButtonEventArgs e) {
    if (Keyboard.Modifiers == ModifierKeys.Shift && e.ChangedButton == MouseButton.Left) {
        var hitTest = view.CalcHitInfo(e.GetPosition(view));
        if (hitTest.InRow) {
            if (grid.CurrentItem == null)
                grid.SelectItem(hitTest.RowHandle);
            grid.SelectRange(grid.GetRowHandleByListIndex(((IList)grid.ItemsSource).IndexOf(grid.CurrentItem)),
                hitTest.RowHandle);
        }
    }
}

While this implementation may require further modification, it behaves in a similar manner.

Regards,
Alexander

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