Problem with nodes selection in ReadOnly mode

Hello

I faced with a strange behaviour if IsReadOnly and ReadOnlyCanSelect properties set to true both. Selection with Ctrl or Shift button doesn't work properly.

I have the following definition for surface control:

<ms:DiagramSurface Name="ds" CanSelectConnectionsWithMarqueeRectangle="True"
                       Grid.Row="0"
                       BorderThickness="1,0,1,1"
                       Formatter="{StaticResource Formatter}"
                       HorizontalSnapSpecifier="{ms:SnapToInterval 10}"
                       VerticalSnapSpecifier="{ms:SnapToInterval 10}" 
                       SelectionMode="Extended"
                       SnapLineDrawing="{StaticResource SnapLineDrawing}"
                       ReadOnlyCanSelect="True" IsReadOnly="True"
                       AllowInfiniteScrolling="True" DragAction="Select"
                       ZoomMode="ControlMouseWheel">
    </ms:DiagramSurface>

But selection with marquee rectangle works fine. Could you please take a look at this. I can send you a repro project if needed.

Dmitry

Thanks for pointing this out Dmitry

This bug will be resolved in the next nightly build

Jason Fauchelle

Hello Jason

The problem with multi selection using ctrl button is solved. But I see a strange behaviour if I hold Shift button and try to select some nodes. The problem occures only in Extended mode (SelectionMode="Extended", ReadOnlyCanSelect="True", IsReadOnly="True").

I'm not sure, may be it is a feature, but I cannot understand the logic of selection.

Dmitry

Hello Dmitry

Within the DiagramSurface is a ListBox which is taking control of the selection logic when in ReadOnly mode. When holding Shift, the ListBox is causing a range of nodes to be selected based on the order they were added to the diagram. We don't actually intend for there to be any selection logic related to holding the Shift key, so in the next nightly build, holding the Shift key in read only mode will not do anything related to selection. The nodes will just be selected as though the Shift key were not being pressed. Using a ListBox made sense at first, but it will probably be removed in a future version due to these selection interferences.

Jason Fauchelle