CODEWITHSUNDEEP
c#wpfxamlmvvm
coolercargo
coolercargo

Reputation: 247

MVVM ListBox Mouse Click not working but MouseDoubleClick is

I am trying to get my program to copy a textblock from a grid to the Clipboard after it has successfully done it once. I have a SelectionChanged event that copies the data to the clipboard I than go to an editor paste the clipboard and it works fine. I than copy some other data to the clipboard. I than switch back to the program and double click the mouse to copy the data to the clip board again. I would like to just use the MouseDown or MouseLeftButtonClick event but I can't seem to get them to work. Do only some Mouse events work in this scenario?

<ListBox>
   <ListBox.ItemTemplate>
        <DataTemplate>
            <Border BorderThickness="1">
                <StackPanel Orientation="Horizontal" ScrollViewer.CanContentScroll="True" Width="auto" >
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>
                    </Grid>
                    <TextBlock Width="130" Grid.Column="0" ScrollViewer.CanContentScroll="True" x:Name="TextSelected" Text="{Binding Description}" TextWrapping="Wrap"  Margin="5,0,10,0"  HorizontalAlignment="Stretch" />
                    <TextBlock Width="150" Grid.Column="1" ScrollViewer.CanContentScroll="True" x:Name="TextCommand" Text="{Binding Command}" Margin="0,0,10,0"  TextWrapping="Wrap"  HorizontalAlignment="Stretch" />
                    <TextBlock Width="200" Grid.Column="2" ScrollViewer.CanContentScroll="True" x:Name="TextLocation" Text="{Binding Location}" Margin="0,0,10,0"  TextWrapping="Wrap"  HorizontalAlignment="Stretch" />
                </StackPanel>
            </Border>
        </DataTemplate>
    </ListBox.ItemTemplate>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseDoubleClick">
            <i:InvokeCommandAction Command="{Binding AddItemBtn}" CommandParameter="{Binding ElementName=AddItemList2,Path=SelectedItem}" />
        </i:EventTrigger>

        <i:EventTrigger EventName="SelectionChanged">
            <i:InvokeCommandAction Command="{Binding AddItemBtn}" CommandParameter="{Binding ElementName=AddItemList2,Path=SelectedItem}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ListBox>

Upvotes: 2

Views: 1225

Answers (1)

Jan Paolo Go
Jan Paolo Go

Reputation: 6552

You should capture PreviewMouseDown or PreviewMouseLeftButtonDown instead.

For example:

<i:EventTrigger EventName="PreviewMouseDown">
   <i:InvokeCommandAction Command="{Binding PreviewMouseDownCommand}" CommandParameter="{Binding ElementName=AddItemList2,Path=SelectedItem}" />
</i:EventTrigger>

The reason that MouseDown and MouseLeftButtonDown does not work as you expected is because those are bubbling events that are raised by the ListBoxItem which are already handled by the ListBoxItem itself.

In applications, it is quite common to just handle a bubbling routed event on the object that raised it

PreviewMouseDown and PreviewMouseLeftButtonDown are tunneling events which are invoked on your root element first then travels through the child elements. Usually, we bind the root element (maybe a UserControl or Window) to the DataContext thus giving you the opportunity to handle the event there.

You can read more about Tunneling/Bubbling events here (quoted statement above also taken here): https://learn.microsoft.com/en-us/dotnet/framework/wpf/advanced/routed-events-overview

Upvotes: 2

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