Hi all,
I've wrapped a Diagram inside a ScrollViewer, here's the xaml:

<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:my="clr-namespace:MindFusion.Diagramming.Silverlight;assembly=MindFusion.
Diagramming.Silverlight"
xmlns:controlsToolkit="clr-namespace:System.Windows.Controls;assembly=System.Wi
ndows.Controls.Toolkit"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
x:Class="DiagramAdapter"
Width="Auto" Height="Auto" >
<Grid x:Name="LayoutRoot"
Background="Transparent"
ShowGridLines="True"
Loaded="LayoutRoot_Loaded"
Width="Auto" Height="Auto"
>

<Grid.ColumnDefinitions>
<ColumnDefinition Width="0"/>

</ColumnDefinition>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="0"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="0"/>
<RowDefinition Height="*"/>
<RowDefinition Height="0"/>
</Grid.RowDefinitions>

<ScrollViewer
Grid.Column="1" Grid.Row="1"
HorizontalScrollBarVisibility="Visible"
VerticalScrollBarVisibility="Visible">

<my:Diagram
x:Name="diagramControl"
Behavior="Custom"
AllowInplaceEdit="True"
DefaultShape="Rectangle"
BackBrush="AliceBlue"
LinkHeadShape="Triangle"
LinkCrossings="Arcs"
/>

</ScrollViewer>

</Grid>
</UserControl>

I also defined an event handle in code-behind in order to respond to mouse_wheel event and implement zooming in and out (I got the code from somewhere here or in examples):

double expectedZoom = diagramControl.ZoomFactor + (diagramControl.ZoomFactor) / (e.Delta / 12.0);

if ((expectedZoom >= 20) && (expectedZoom <= 180))
{
diagramControl.ZoomFactor += (diagramControl.ZoomFactor) / (e.Delta / 12.0);
}

The problems is that when I zoom in or out the scrollviewer gets resized as well, _sigh_.

Any idea?

Cheers,
baba

Hi,

If you don't want it to resize, you might have to assign fixed Width and Height to the ScrollViewer, or to the respective column and row of the grid. Otherwise the ScrollViewer requests as much space as needed to fit the whole zoomed diagram during the layout pass, and it gets resized if the parent grid gives it more space than the initial size.

I hope that helps,
Stoyan