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BigWander1
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Diagram scroll
Jan 9th, 2026 at 7:57am
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Hi! I have question about scroll feature when user moves object outside of diagram control. In related solution, when user moves object outside of diagram control, scrolls does not follow it and just stay on the same place. But, if Template assignment will be removed (36 line, MainWindow.xaml), then scrolls will follow this object. Could you help me, is it possible to use build-in features to make scrolls follow selected object (with template assignment) or i need to implement custom logic for it?
  
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Slavcho
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Re: Diagram scroll
Reply #1 - Jan 9th, 2026 at 9:15am
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Hi,

Checking diffs with our standard template, adding CanContentScroll to the custom one and removing the Margin value fixes auto-scrolling:

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<ScrollViewer
    x:Name="PART_ScrollViewer"
    CanContentScroll="True"
    VerticalScrollBarVisibility="Auto"
    HorizontalScrollBarVisibility="Auto">

    <mindfusion:DiagramPresenter
        x:Name="PART_Presenter"
        HorizontalAlignment="Left"
        VerticalAlignment="Top"/>

</ScrollViewer>


CanContentScroll lets the ScrollViewer communicate with DiagramPresenter via IScrollInfo interface.

I guess Margin value interferes somehow with our hot-zone calculation for when to start scrolling. If you need to add Margin back, see if you can compensate for it by adjusting the DiagramView.ScrollZoneSize property.

Regards,
Slavcho
Mindfusion
  
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