For Command "CommandZoomIn", CanExecute and Execute do not occurs for controls defined into the ListBox ItemTemplate. GraphLcView method "CanExecute" and "Execute" are both called when GraphLcView UserControl is defined directly as child of AnalysisView, but both methods are never called when they are added as Item DataTemplate of a ListBox ItemTemplate.
- The button with the command is defined in my top level window into a Ribbon.
- Simplified hierarchy:
- (Working) Top Level window -> AnalysisView -> GraphLcView
- (Not working) Top Level window -> AnalysisView -> ListBox + ItemTemplate -> GraphLcView
- The CommandBinding is defined into GraphLcView child control (UserControl.CommandBinding)
- There is no MVVM implied into the CommandBindind
Update: I made a working sample to demo the problem but I had a different behavior than explained here. But the fully working sample should probably show something similar to what I have here. Because the bahvior is different, I asked another question at StackOverflow. Code is available here at GitHub
User Control 'GraphLcView' partial code:
<UserControl x:Class="GraphCtrl.GraphView.GraphLcView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
...
<Grid.CommandBindings>
<CommandBinding Command="{x:Static graphCtrlCommand:CtrlAnalysisCommand.CommandZoomToFitsAll}" CanExecute="CanZoomToFitsAll" Executed="ZoomToFitsAll"/>
<CommandBinding Command="{x:Static graphCtrlCommand:CtrlAnalysisCommand.CommandZoomIn}" CanExecute="CanZoomIn" Executed="ZoomIn"/>
<CommandBinding Command="{x:Static graphCtrlCommand:CtrlAnalysisCommand.CommandZoomOut}" CanExecute="CanZoomOut" Executed="ZoomOut"/>
UserControl AnalysisView partial code (where previous GraphLcView UserControl is used):
<!-- ********************************-->
<!-- ********************************-->
<!-- CommmandBinding works fine here -->
<!-- ********************************-->
<!-- ********************************-->
<graphView1:GraphLcView Grid.Row="1" x:Name="GraphView" Graph="{Binding Graph}"
Visibility="{Binding IsMain, Converter={StaticResource BooleanToVisibilityConverter1}}"
TrackedSignal="{Binding DataContext.LastTrackedSignal, Mode=TwoWay, ElementName=MyControl}"
SourceTrackedSignal ="{Binding Model.EventTrackingSourceGraphToLegend, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ElementName=MyControl}"
IsMouseInteractive="{Binding IsMouseInteractive}"
UseFastTooltip="{Binding UseFastTooltip}"
ActiveObjectChanged="OnChildActiveObjectChanged"
>
</graphView1:GraphLcView>
<Grid Name="GridDetails" Grid.Row="1" >
<ListBox Name="ListBoxDetails" ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ItemsSource="{Binding Graph.AdditionalViews}"
Visibility="{Binding IsDetails, Converter={StaticResource BooleanToVisibilityConverter1}}"
HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True"
Name="DetailsWrapPanel"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Border BorderBrush="Black" BorderThickness="1" Margin="0,1,0,1"
Width="{Binding DataContext.DetailsWorkspaceDimensionX, ElementName=MyControl, Mode=OneWay}"
Height="{Binding DataContext.DetailsWorkspaceDimensionY, ElementName=MyControl, Mode=OneWay}"
>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="{Binding Name}"></TextBlock>
<!-- ********************************-->
<!-- ********************************-->
<!-- Binding does not work fine here -->
<!-- ********************************-->
<!-- ********************************-->
<!--ActiveObjectChanged="GraphLcViewDetailOnActiveObjectChanged"-->
<!--SourceTrackedSignal="{Binding DataContext.EventTypeSourceForSignalTrackingToGraph, Mode=TwoWay, ElementName=MyControl}"-->
<graphView1:GraphLcView Grid.Row="1"
AdditionalView="{Binding Path=., Mode=OneWay}"
Graph="{Binding Graph, ElementName=GraphView}"
TrackedSignal="{Binding DataContext.LastTrackedSignal, Mode=TwoWay, ElementName=MyControl}"
SourceTrackedSignal ="{Binding Model.EventTrackingSourceGraphToLegend, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ElementName=MyControl}"
IsMouseInteractive="{Binding IsMouseInteractive}"
UseFastTooltip="{Binding UseFastTooltip}"
ActiveObjectChanged="OnChildActiveObjectChanged"
>
</graphView1:GraphLcView>
</Grid>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
