WPF Legend: context menu

[dpstark]

Is there any way with the WPF Legend control to detect the type of item the user clicks on when they right click to open a context menu? I have an application showing plots and cursors in the legend. When the user clicks on a cursor, I want to serve up a context menu for that cursor. If they click on a plot, I want to present a context menu for that plot. Not only do I need to know the type of item, but also which item specifically they click on.

I do exactly this in WinForms with the legend control there. There does not appear to be a similar mechanism in WPF. Am I missing something?

[2Shanez]

Hi dpstark,

What version of Measurement Studio are you using? When doing this with WinForms are you using a reference to the item type?

Thanks,

ShaneK

Applications Engineering

[dpstark]

Measurement Studio 2015 for VS 2013.

In WinForms, I use 

legend.GetItemAt(e.X, e.Y)

where e is the MouseEventArgs from a MouseDown event to retrieve the LegendItem at that point (or null). If it's a cursor, I display a cursor menu. If it's a plot, the plot menu, etc.

I can't find a similar method for WPF Legend because it only returns that a label, button, etc., was clicked- not a LegendItem.

[phansen]

The legend does not expose any programmatic way to access the items it displays. However, like an ItemsControl, the legend supports customization through data templates. For example, to show a right-click ContextMenu, you could declare a data template resource like that shown below:

    <ni:Legend.Resources>
        <DataTemplate DataType="{x:Type ni:​Plot}">
            <StackPanel Orientation="Horizontal" Background="Transparent">
                <StackPanel.ContextMenu>
                    <ContextMenu>
                        <MenuItem Header="Plot Menu" />
                    </ContextMenu>
                </StackPanel.ContextMenu>

                <niPrimitives:LegendGlyph Renderer="{Binding ActualRenderer}"
                                          Background="{Binding ItemBackground, RelativeSource={RelativeSource AncestorType={x:Type ni:Legend}, Mode=FindAncestor}}"
                                          Width="{Binding GlyphSize.Width, RelativeSource={RelativeSource AncestorType={x:Type ni:Legend}, Mode=FindAncestor}}"
                                          Height="{Binding GlyphSize.Height, RelativeSource={RelativeSource AncestorType={x:Type ni:Legend}, Mode=FindAncestor}}" />

                <ContentPresenter Margin="3"
                                  VerticalAlignment="Center"
                                  Content="{Binding Label}"
                                  ContentTemplate="{Binding LabelTemplate}" />
            </StackPanel>
        </DataTemplate>
    </ni:Legend.Resources>