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Normal Topic Synchronisation between views. (Read 342 times)
DamianKey
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Synchronisation between views.
Dec 18th, 2025 at 9:03am
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I have a simple application which has two tabs and same one model bound to both tabs.
In model there are two ShapeNodes, one DiagramLink and all that put to the DiagramView. One instance of model is bound to two DiagramView per each tab one. 
Problem: When I drag Node 2 on the Tab1 and switch to Tab2 it does not get updated. Namely, line gets updated but nodes remain in its origin position, until the moment I slightly scroll the view.
I tried to call DiagramView.InvalidateVisual() but no change. Can you provide some idea how to tackle this problem? In prior version of MindFusion (3.9.5) view was updated automatically.
  
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Slavcho
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Re: Synchronisation between views.
Reply #1 - Dec 18th, 2025 at 10:07am
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We have reproduced. During mouse move handling the control calls an immediate Arrange on node's presenter for smoother update, but apparently that's ignored on inactive tabs (our developer guesses for any UIElement whose IsVisible returns false). So we'll add some checks for that to Invalidate instead of arrange immediately. For time being try this to work around the problem:

Code
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void TabCtrl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    var selectedTab = (TabItem)tabCtrl.SelectedItem;
    var selectedView = (DiagramView)selectedTab.Content;

    var presenter = selectedView.Template
        .FindName("PART_Presenter", selectedView) as DiagramPresenter;
    if (presenter != null)
    {
        foreach (UIElement child in presenter.Children)
            child.InvalidateMeasure();
    }
}


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Slavcho
Mindfusion
  
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DamianKey
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Re: Synchronisation between views.
Reply #2 - Dec 19th, 2025 at 10:21am
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Thank You.
I just checked the proposed solution and works well.
Thanks for a quick response.
Regards, Damian
  
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Slavcho
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Re: Synchronisation between views.
Reply #3 - Dec 19th, 2025 at 11:15am
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New build here should handle that scenario correctly -

https://www.nuget.org/packages/MindFusion.Diagramming.Wpf/4.2.2-beta3

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Slavcho
Mindfusion
  
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