Develop Reference

Adjust Selected ListViewItem TextBlock Style

I am having a strange issue. I am not sure if this is a bug, or if I am simply misunderstanding something as I am fairly new to WPF (Probably the latter).
In my project, I have a ListView that displays items in a similar fashion to that seen of Windows Explorer using Icon view. I have outlined a control template that consists of a an Image element, and a TextBlock element below it. My goal is to adjust the maximum height of the TextBlock when the ListViewItem is selected. This is so the name of the Items will adjust from being trimmed with an ellipsis to showing the full name of the item.
When the item is selected however, instead of adjusting the maximum height of only the selected item's TextBlock, it adjusts all TextBlocks for each item whether it is actively selected or not.
I have researched for an answer, but have not found anything similar to this particular issue. This link is a similar concept, but without my problem.
WPF - ListView Item on Selected change Font size
Some of my other methods have consisted of one ControlTemplate with triggers for the style changes, or ItemContainerStyle instead of explicitly a ControlTemplate, which all seemed to give the same undesired result.
How can I achieve this functionality? Is it possible with ControlTemplate?
Here is some of my XAML code:
ListView
<ListView x:Name="ItemViewer">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Margin="10"/>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="Margin" Value="10"/>
<Setter Property="Template" Value="{StaticResource ListViewItemNormal}"/>
<Style.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="True"/>
<Condition Property="Selector.IsSelectionActive" Value="True"/>
</MultiTrigger.Conditions>
<Setter Property="Template" Value="{StaticResource ListViewItemSelected}"/>
</MultiTrigger>
</Style.Triggers>
</Style>
</ListView.ItemContainerStyle>
</ListView>
ControlTemplates
<ControlTemplate x:Key="ListViewItemNormal" TargetType="{x:Type ListViewItem}">
<Border x:Name="ItemBoxBorder" Background="Transparent">
<Grid HorizontalAlignment="Left" MinHeight="90"
Margin="5"
MaxWidth="90"
Width="90"
x:Name="ItemBox">
<StackPanel>
<Image HorizontalAlignment="Center"
VerticalAlignment="Top"
Source="{StaticResource NewImage}"
Width="64" Height="64"/>
<TextBlock x:Name="ItemDescription"
Text="{Binding Path=Name}"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
TextWrapping="Wrap"
MaxWidth="90"
MaxHeight="30"
TextTrimming="CharacterEllipsis"/>
</StackPanel>
<Grid.ToolTip>
<ToolTip Content="{Binding Path=Name}"/>
</Grid.ToolTip>
</Grid>
</Border>
<ControlTemplate.Triggers>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="False"/>
<Condition Property="IsMouseOver" Value="True"/>
</MultiTrigger.Conditions>
<Setter TargetName="ItemBoxBorder" Property="Background" Value="{StaticResource HighlightMouseHoverColorBrush}"/>
</MultiTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<ControlTemplate x:Key="ListViewItemSelected" TargetType="{x:Type ListViewItem}">
<Border x:Name="ItemBoxBorder" Background="{StaticResource SelectedItemBrush}"
BorderBrush="{StaticResource HighlightBorderColorBrush}"
BorderThickness="1">
<Grid HorizontalAlignment="Left" MinHeight="90"
Margin="5"
MaxWidth="90"
Width="90"
x:Name="ItemBox">
<StackPanel>
<Image HorizontalAlignment="Center"
VerticalAlignment="Top"
Source="{StaticResource NewImage}"
Width="64" Height="64"/>
<TextBlock x:Name="ItemDescription"
Text="{Binding Path=Name}"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
TextWrapping="Wrap"
MaxWidth="90"
MaxHeight="125"
TextTrimming="CharacterEllipsis"/>
</StackPanel>
<Grid.ToolTip>
<ToolTip Content="{Binding Path=Name}"/>
</Grid.ToolTip>
</Grid>
</Border>
</ControlTemplate>
EDIT
Here is an example of the issue with ms_dos's implementation.
This image shows I have the item with a short description selected. This is the height all items should remain if they are not selected.
In this image, you'll see the item with the long description is selected. However, both items extend their height, but only the selected one should grow.

You don't need two separate control templates for this. Just take the ItemContainerStyle property of the ListView and use a control template like this:
<ListView x:Name="ItemViewer">
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel Margin="10" />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<Border x:Name="ItemBoxBorder"
Background="Green"
BorderThickness="1"
VerticalAlignment="Top">
<Grid HorizontalAlignment="Left"
MinHeight="90"
Margin="5"
MaxWidth="90"
Width="90"
x:Name="ItemBox">
<StackPanel>
<Image HorizontalAlignment="Center"
VerticalAlignment="Top"
Width="64"
Height="64" />
<TextBlock x:Name="ItemDescription"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
TextWrapping="Wrap"
Text="{Binding}"
MaxWidth="90"
MaxHeight="125"
TextTrimming="CharacterEllipsis" />
</StackPanel>
<Grid.ToolTip>
<ToolTip Content="{Binding Path=Name}" />
</Grid.ToolTip>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected"
Value="true">
<Setter TargetName="ItemBoxBorder"
Property="Background"
Value="Red" />
<Setter TargetName="ItemDescription"
Property="TextElement.FontSize"
Value="20" />
<Setter TargetName="ItemBoxBorder"
Property="Height"
Value="135" />
</Trigger>
<Trigger Property="IsSelected"
Value="false">
<Setter TargetName="ItemBoxBorder"
Property="Height"
Value="90" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
</ListView>
Take a look at the ControlTemplate.Triggers section. Basically you use the Trigger property to control which property the trigger should handle... in our case the IsSelected from the ListView. And with the Setter you define the property and the value for the changes of the ListViewItem control. The TargetName of the Setter refers to the x:Name of the control which you define in the ControlTemplate section.
I hope this example helps you with your problem!
Greets
ms_dos

Name header for context menu

The title seems easier than first thought, but I have a context menu that is bound to a list of items. I want to be able to display a title for the context menu to access the list. Currently it just shows up as blank and then allows me to view the list, however I need it to display a title "Add Existing Properties". Also if someone can help me with my image problem that would be much appreciated :). Instead of the first one having the image name I want that to display the name "Add Existing Properties"
<DataTemplate x:Key="AddNodeTemplate">
<Border BorderThickness="1" Background="#F7F7F7">
<Border.BorderBrush>
<DrawingBrush Viewport="8,8,8,8" ViewportUnits="Absolute" TileMode="Tile">
<DrawingBrush.Drawing>
<DrawingGroup>
<GeometryDrawing Brush="#F7F7F7">
<GeometryDrawing.Geometry>
<GeometryGroup>
<RectangleGeometry Rect="0,0,50,50"/>
<RectangleGeometry Rect="50,50,50,50"/>
</GeometryGroup>
</GeometryDrawing.Geometry>
</GeometryDrawing>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</Border.BorderBrush>
<StackPanel>
<Button x:Name="ButtonAdd" Click="ButtonAdd_Click" Height="30" Width="130">
<Button.Style>
<Style TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Background="#F7F7F7">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="25"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Image Source="Images/icon_plus.bmp" HorizontalAlignment="Left" Margin="5,0,0,0"/>
<TextBlock Text="Add Property" HorizontalAlignment="Center" Grid.Column="1" VerticalAlignment="Center" Foreground="LightGray" FontStyle="Italic" FontSize="12"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Background" Value="#F7F7F7"/>
</Style>
</Button.Style>
<Button.ContextMenu>
<ContextMenu>
<MenuItem Header="Add Exisiting Properties" ItemsSource="{Binding Path=AvailableProperties}">
<MenuItem.Resources>
<Style TargetType="MenuItem">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ContentPresenter Content="{Binding Name}" />
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="Icon">
<Setter.Value>
<DataTemplate>
<StackPanel>
<Image Width="12" Height="12" Source="{Binding Icon, Converter={StaticResource ImageToSourceConverter}}" Margin="3" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</MenuItem.Resources>
</MenuItem>
<MenuItem Header="Upscale well logs"/>
<MenuItem Header="Upscale well_top attributes"/>
<MenuItem Header="Upscale point attributes"/>
<MenuItem Header="Calculate"/>
</ContextMenu>
</Button.ContextMenu>
</Button>
</StackPanel>
</Border>
</DataTemplate>
What is displayed

This style <Style TargetType="MenuItem"> in fact also applies on the top level MenuItem (the one you hardcodedly set its Header to Add Exisiting Properties). You need to use a Trigger to filter that out based on the Role property. All the sub menu items have Role of SubMenuItem, so it should be like this:
<Style TargetType="MenuItem">
<Style.Triggers>
<Trigger Property="Role" Value="SubMenuItem">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ContentPresenter Content="{Binding Name}"/>
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
<!-- ... -->
</Style>
Edit: About the Icon, you explicitly set it to a DataTemplate which is not rendered, instead it uses the string returned by ToString() (hence the text System.Windows.DataTemplate in place of the icon). You can just remove DataTemplate like this:
<!-- define a non-shared resource of Image -->
<Style TargetType="MenuItem">
<Style.Resources>
<Image x:Key="img" x:Shared="False" Width="12" Height="12" Source="{Binding Icon, Converter={StaticResource ImageToSourceConverter}}"
Margin="3" VerticalAlignment="Center"/>
</Style.Resources>
<!-- ... -->
</Style>
<Setter Property="Icon" Value="{StaticResource img}"/>
Final solution:
<Style TargetType="MenuItem">
<Style.Resources>
<Style TargetType="ContentPresenter">
<Style.Triggers>
<Trigger Property="ContentSource" Value="Icon">
<Setter Property="ContentTemplate">
<Setter.Value>
<DataTemplate>
<Image Source="{Binding}"/>
</DataTemplate>
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
</Style.Resources>
<Setter Property="Icon" Value="{Binding Icon,
Converter={StaticResource ImageToSourceConverter}}"/>
<!-- ... -->
</Style>

you can either use
`
<MenuItem Header="Add Exisiting Properties" ItemsSource="{Binding Path=AvailableProperties}">
<MenuItem.Resources>
<Style TargetType="MenuItem">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ContentPresenter Content="{TemplateBinding Header}" />
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
or
<MenuItem Header="Add Exisiting Properties" ItemsSource="{Binding Path=AvailableProperties}">
<MenuItem.Resources>
<Style TargetType="MenuItem">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<ContentPresenter Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Header}" />
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
`

How to change itemsControl stackpanel background color

Says I have a list of 10 items someList, I will show them on my page via itemsControl like below:
<ItemsControl DataContext="{Binding [someViewModel]}"
BorderBrush="Black"
ItemSource="{Binding someList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Border BorderThickness="1" Background="Green">
<StackPanel MouseDown="{Binding Path=DataContext.someCommand,
RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type ItemsControl}}}"
Command Parameter="{Binding someID}">
<TextBlock Text="{Binding something}">
</StackPanel>
</Border>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
I do able to trigger someCommand method and I do able to pass in someID as input parameter. Now I'm wondering how to update the stackPanel background color, making it looks like "selected". Meaning now all item will have a green background, when I click on one of the stackpanel, that stackpanel should change background to red and change others back to green

If you want to use ItemsControl you can change ItemTemplate to RadioButton with custom ControlTemplate that will include Border which Background would change to Red when IsChecked == true:
<ItemsControl DataContext="{Binding [someViewModel]}" BorderBrush="Black" ItemSource="{Binding someList}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton Content="{Binding something}" GroupName="radioGroup">
<RadioButton.Template>
<ControlTemplate TargetType="{x:Type RadioButton}">
<Border Background="Green" x:Name="PART_Border">
<ContentPresenter/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="PART_Border" Property="Background" Value="Red"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</RadioButton.Template>
</RadioButton>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
However I don't see a reason why you cannot use ListBox with SelectionMode=Single (default value) and change Template of ListBoxItem:
<ListBox DataContext="{Binding [someViewModel]}" BorderBrush="Black" ItemSource="{Binding someList}">
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border Background="Green" x:Name="PART_Border">
<ContentPresenter/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter TargetName="PART_Border" Property="Background" Value="Red"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
or even do something like this, without changing Template:
<ListBox DataContext="{Binding [someViewModel]}" BorderBrush="Black" ItemSource="{Binding someList}">
<ListBox.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Red"/>
</ListBox.Resources>
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="Background" Value="Green"/>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>
In WPF it's generally much easier to pick a control that has functionality that you need and style it to look like you want then do this the other way round

why not do something like this
<DataTemplate>
<Border BorderThickness="1" Background="Green" x:Name="MyBorder">
<StackPanel MouseDown="{Binding Path=DataContext.someCommand,
RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type ItemsControl}}}"
Command Parameter="{Binding someID}">
<TextBlock Text="{Binding something}">
</StackPanel>
</Border>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Path=IsSelected}" Value="true">
<Setter TargetName="MyBorder" Property="Background" Value="Black" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>

WPF Resource section not effecting my Label control in the view

I have created a style for a “required field” label which should place a red asterisk “*” in front of the label. Here is my xaml taken from the Application.Resources section of my WPF application:
<Style TargetType="Label" x:Key="RequiredField">
<Setter Property="Margin" Value="0,0,5,0" />
<Setter Property="HorizontalAlignment" Value="Right" />
<Setter Property="Content">
<Setter.Value>
<ControlTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="*" Foreground="Red" FontSize="10"/>
<TextBlock Text="{Binding}" />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The xaml in my view uses the resource like this:
<Label Grid.Row="1" Grid.Column="0" Style="{StaticResource RequiredField}" Content="Name:"/>
Annoyingly it doesn’t appear to modify the label. Can anyone tell me what I’ve done wrong?

Well your style seems to be wrong. I would try it that way.
<Style TargetType="Label" x:Key="RequiredField">
<Setter Property="Margin" Value="0,0,5,0" />
<Setter Property="HorizontalAlignment" Value="Right" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Label}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="*" Foreground="Red" FontSize="10"/>
<TextBlock Text="{TemplateBinding Content}" />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
This should do the trick, but it's totally untested.

The template is assigned to the Content property. That is wrong.
Instead it can be assigned to the Template property but in this case it might be better to use the Validation.ErrorTemplate property because it is meant for validation adorners.
From this article:
<ControlTemplate x:Key="TextBoxErrorTemplate">
<StackPanel>
<StackPanel Orientation="Horizontal">
<Image Height="16" Margin="0,0,5,0"
Source="Assets/warning_48.png"/>
<AdornedElementPlaceholder x:Name="Holder"/>
</StackPanel>
<Label Foreground="Red" Content="{Binding ElementName=Holder,
Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"/>
</StackPanel>
</ControlTemplate>
<TextBox x:Name="Box"
Validation.ErrorTemplate="{StaticResource TextBoxErrorTemplate}">

How do you bind a ListBox of CheckBoxes while preserving selection style?

I have the following XAML to bind data to a ListBox filled with CheckBoxes:
<ListBox Background="Transparent" Grid.Column="8" Grid.Row="3" ItemsSource="{Binding Path=StakeTypes}" Foreground="White"
Name="lbStakes" ItemContainerStyle="{StaticResource SelectionListBoxItem}" SelectionChanged="lbStakes_SelectionChanged" SelectionMode="Extended">
<ListBox.ItemTemplate>
<DataTemplate>
<ListBoxItem IsSelected="{Binding IsSelected, Mode=TwoWay}" HorizontalContentAlignment="Stretch">
<CheckBox Cursor="Hand" IsChecked="{Binding IsSelected, Mode=TwoWay}" Content="{Binding Text}" HorizontalContentAlignment="Stretch" />
</ListBoxItem>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
Problem is, the style for the ListBox selection is different than if I manually created each ListBox Item:
<ListBox Background="Transparent" Cursor="Hand" Grid.Column="6" Grid.Row="3" Name="lbStakes" SelectionMode="Extended">
<ListBoxItem IsSelected="True">
<CheckBox IsChecked="True" Foreground="White" Content="Low" />
</ListBoxItem>
<ListBoxItem IsSelected="True">
<CheckBox IsChecked="True" Foreground="White" Content="Medium" />
</ListBoxItem>
<ListBoxItem IsSelected="True">
<CheckBox IsChecked="True" Foreground="White" Content="High" />
</ListBoxItem>
<ListBoxItem IsSelected="True">
<CheckBox IsChecked="True" Foreground="White" Content="Highest" />
</ListBoxItem>
</ListBox>
Here are the images:
I would like it to look like the second image. Any ideas are greatly appreciated.
Update: The following is the style I am trying to apply to the ListBoxItem:
<Style x:Key="SelectionListBoxItem" TargetType="ListBoxItem">
<Setter Property="FocusVisualStyle" Value="{x:Null}" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Border Name="Border" Padding="3" SnapsToDevicePixels="true">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="Border" Property="Background" Value="{StaticResource myBrush}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

The two styles are different because in your bound ListBox you are using ItemContainerStyle="{StaticResource SelectionListBoxItem}", whereas in your second snippit, the default listbox item style applies. Try removing this style assignment from the bound listbox.

<Window.Resources>
<Style x:Key="SelectionListBoxItem" TargetType="ListBoxItem">
<Setter Property="KeyboardNavigation.TabNavigation" Value="None"></Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<Border Name="Border" BorderBrush="Black" BorderThickness="0.5" SnapsToDevicePixels="true">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter TargetName="Border" Property="Background" Value="Red"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Grid>
<ListBox Background="Transparent" Grid.Column="8" Grid.Row="3" ItemsSource="{Binding Path=IsSelectede}" Foreground="White"
Name="lbStakes" ItemContainerStyle="{StaticResource SelectionListBoxItem}">
<ListBox.ItemTemplate>
<DataTemplate>
<ListBoxItem IsSelected="{Binding IsSelected, Mode=TwoWay}" HorizontalContentAlignment="Stretch" KeyboardNavigation.TabNavigation="None">
<CheckBox Cursor="Hand" IsChecked="{Binding IsSelected, Mode=TwoWay}" Content="{Binding Text}" HorizontalContentAlignment="Stretch" />
</ListBoxItem>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
some of the binding properties are changed please correct them according to your properties .And also the style of your brush.I hope this will help.