Adding resize handles to RadDiagramShape

[Burl]

Is it possible to add resize handles to a RadDiagramShape object, so it would look something like this?

[Stenly]

Hello Burl,

This behavior is not supported out of the box, however, you could still try to achieve it by creating a custom ManipulationAdorner and handling the resizing of the additional handlers manually. A good example that shows this is the Swimlane demo from our WPF Controls Examples application.

With that said, the following code snippet, from the Swimlane demo, shows how to add handlers to the control template of a custom ManipulationAdorner control:

<Style TargetType="swimlane:CustomManipulationAdorner">
    ......
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="swimlane:CustomManipulationAdorner">
            ....
                <Rectangle x:Name="BottomMiddleResizeHandle"
                       Margin="{StaticResource ManipulationAdornerThicknessB}"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Bottom"
                       Style="{StaticResource rectangleStyle}"
                       Visibility="{Binding RelativeSource={RelativeSource TemplatedParent},
                                            Path=IsResizingEnabled,
                                            Converter={StaticResource converter}}">
                    <ToolTipService.ToolTip>
                        <ToolTip telerik:LocalizationManager.ResourceKey="Diagram_Resize" />
                    </ToolTipService.ToolTip>
                </Rectangle>
                <Rectangle x:Name="TopMiddleResizeHandle"
                       Margin="{StaticResource ManipulationAdornerThicknessB}"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Top"
                       Style="{StaticResource rectangleStyle}"
                       Visibility="{Binding RelativeSource={RelativeSource TemplatedParent},
                                            Path=IsResizingEnabled,
                                            Converter={StaticResource converter}}">
                    <ToolTipService.ToolTip>
                        <ToolTip telerik:LocalizationManager.ResourceKey="Diagram_Resize" />
                    </ToolTipService.ToolTip>
                </Rectangle>
            ....
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

And then handle the logic in code-behind:

public class CustomManipulationAdorner : ManipulationAdorner
{
    private Rectangle bottomMiddleHandle;
    private Rectangle topMiddleHandle;
    public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        this.bottomMiddleHandle = GetTemplateChild("BottomMiddleResizeHandle") as Rectangle;
        this.topMiddleHandle = GetTemplateChild("topMiddleResizeHandle") as Rectangle;
    }
.............
}

I hope that you find this a good starting point for achieving your requirements.

Regards,
Stenly
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