WPF Control to emulate Outlook Attachment-View

Question

I'm trying to get the ListView to look like the MS Outlook Attachment-Control. I've already got the horizontal scrolling, but it still displays only one item in a row.

How can I get it to look like this?

What I've achieved so far:

<Grid x:Name="grdAttachments"
      Grid.Row="4"
      Grid.Column="1"
      Grid.ColumnSpan="3">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" MaxHeight="45" />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="65" />
        <ColumnDefinition Width="15" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>

    <TextBlock Grid.Column="0"
               Margin="3,0,0,0"
               HorizontalAlignment="Left"
               VerticalAlignment="Center"
               Cursor="Hand"
               Text="Angefügt:" />

    <ScrollViewer Grid.Row="0" Grid.Column="2">
        <ListBox x:Name="libAttachments"
                 Background="Transparent"
                 ItemsSource="{Binding Attachments}"
                 MouseDoubleClick="lvAttachments_MouseDoubleClick">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel />
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Margin="0,0,10,0" Orientation="Horizontal">
                        <Image Source="{Binding MimeTypeIcon}" Stretch="None" />
                        <TextBlock Margin="5,0,0,0" Text="{Binding File.Name}" />
                        <StackPanel.ContextMenu>
                            <ContextMenu>
                                <ContextMenu.Items>
                                    <MenuItem Click="btnOpenAttachment_Click" Header="Öffnen">
                                        <MenuItem.Icon>
                                            <Image Source="/Images/magnifier.png" Stretch="None" />
                                        </MenuItem.Icon>
                                    </MenuItem>
                                    <MenuItem Click="btnSaveAttachment_Click" Header="Speichern unter">
                                        <MenuItem.Icon>
                                            <Image Source="/Images/disk-black.png" Stretch="None" />
                                        </MenuItem.Icon>
                                    </MenuItem>
                                </ContextMenu.Items>
                            </ContextMenu>
                        </StackPanel.ContextMenu>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </ScrollViewer>
</Grid>

Answer 1

It sounds like what you want is an ListBox with a custom ItemsPanel.

    <ListBox>
        <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                <WrapPanel/>
            </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
    </ListBox>

The snippet above configures a ListBox to use a WrapPanel as the layout provider or "ItemsPanel" for the items it is to present. From there it may make sense to implement a custom Item Container style, and/or custom Data Templates. You could easily apply a DataTemplate as you did above if you are using an MVVM pattern and data binding to a collection (preferably observable)

    <DataTemplate>
        <StackPanel Margin="0,0,10,0" Orientation="Horizontal">
            <Image Source="{Binding MimeTypeIcon}" Stretch="None" />
            <TextBlock Margin="5,0,0,0" Text="{Binding File.Name}" />
        </StackPanel>
    </DataTemplate>

To complete this picture, a scroll viewer can be used so long as it's height is constrained by either a parent layout control (Grid.Row = 1 where RowDefinition Height="constant") or my an explicit height being set on the ScrollViewer.

My final solution based on yours looks like this:

     <ScrollViewer HorizontalScrollBarVisibility="Disabled">
        <ListBox
        ItemsSource="{Binding Attachments}"
        MouseDoubleClick="lvAttachments_MouseDoubleClick"
        SelectionMode="Single">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <WrapPanel/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>

            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel Margin="0,0,10,0" Orientation="Horizontal">
                        <Image Source="{Binding MimeTypeIcon}" Stretch="None" />
                        <TextBlock Margin="5,0,0,0" Text="{Binding File.Name}" />
                        <StackPanel.ContextMenu>
                            <ContextMenu>
                                <ContextMenu.Items>
                                    <MenuItem Click="btnOpenAttachment_Click" Header="Öffnen">
                                        <MenuItem.Icon>
                                            <Image Source="/Images/magnifier.png" Stretch="None" />
                                        </MenuItem.Icon>
                                    </MenuItem>
                                    <MenuItem Click="btnSaveAttachment_Click" Header="Speichern unter">
                                        <MenuItem.Icon>
                                            <Image Source="/Images/disk-black.png" Stretch="None" />
                                        </MenuItem.Icon>
                                    </MenuItem>
                                </ContextMenu.Items>
                            </ContextMenu>
                        </StackPanel.ContextMenu>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </ScrollViewer>

A few things to note: When possible, consider using Commands instead of events, they can lead to looser coupling. Introducing a Behavior might even make sense if the behavior it's self is something that you might have other places in your project or re-usability is ideal.

Answer 2

Ok so where it seems you got snagged up was with your ListBox still pushing things in single column fashion and the lack of ability to give you something to fire off say a click event. So what I had in mind was something more like this;

<ScrollViewer HorizontalScrollBarVisibility="Disabled" Height="300" HorizontalContentAlignment="Stretch">

   <ItemsControl ItemsSource="{Binding Collection}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <WrapPanel IsItemsHost="True"/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
           <StackPanel Margin="5,0" Orientation="Horizontal">
                       <Image Source="{Binding MimeTypeIcon}" Stretch="None" />
                       <HyperlinkButton Margin="5,0,0,0" Text="{Binding File.Name}" />
                   </StackPanel>          
        </DataTemplate>
    </ItemsControl.ItemTemplate>
   </ItemsControl>
</ScrollViewer>

I wasn't to sure what you were trying to do with your magnifier and disk though I see your Clicks for them, but you can add those to this layout however you like, just a note though, I just free-handed this between meetings so never built it but should work fine. If not we'll plug at it again. Main differences are changing to a hyperlinkbutton to give you click and some other subtle differences from Firoso's but his is still technically sound, or should be anyway :)