I have a Treeview in my WPF application. On the fly, in run time, If the element of the Tree meets certain condition, It should change its Font color from Black To Red.!
XAML
<TreeView Grid.Column="0" Grid.Row="0" HorizontalAlignment="Stretch" Name="treeView1"
VerticalAlignment="Stretch"
SelectedItemChanged="treeView1_SelectedItemChanged" HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Top" BorderThickness="0,0,0,1" BorderBrush="LightGray">
<TreeViewItem Header="Head Tree" ItemsSource="{Binding MainComps}">
<TreeViewItem.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Bold" />
</Trigger>
<DataTrigger Binding="{Binding IsSelected}" Value="True">
<Setter Property="Foreground" Value="RED" />
</DataTrigger>
</Style.Triggers>
</Style>
</TreeViewItem.ItemContainerStyle>
<TreeViewItem.Resources>
<HierarchicalDataTemplate DataType="{x:Type TextBlock}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="Head Tree" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:MainCompViewModel}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Maincompname}" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type local:FeatureViewModel}" ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding FeatureName}" />
</StackPanel>
</HierarchicalDataTemplate>
<DataTemplate DataType="{x:Type local:CompViewModel}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Component}" />
</StackPanel>
</DataTemplate>
</TreeViewItem.Resources>
</TreeViewItem>
</TreeView>
Code behind
private void treeView1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
if(selected Item meets certain condition)
{
//Change color of tree node
}
}
How can I change the color of particular Node and leave it in the same color SO that when expanded again It should be in RED.
Any help would be appreciated.
You could create a boolean property in the model which is true when the elements meets the condition. Then you bind the Foreground like so:
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=BoolProp}" Value="False">
<Setter Property="Foreground" Value="Blue"></Setter>
</DataTrigger>
<DataTrigger Binding="{Binding Path=BoolProp}" Value="True">
<Setter Property="Foreground" Value="Red"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
or with converter:
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="Foreground" Value="{Binding Path=BoolProp, Converter={StaticResource ResourceKey=TheKey}}"/>
</Style>
</TreeView.ItemContainerStyle>
Just change the Foreground:
TreeViewItem ti = (TreeViewItem)treeView1.SelectedItem;
ti.Foreground = Brushes.Red;
That is embedded into the template. You can only change the color by copying the default Aero-Style for the control and changing the hard-coded value.
Or by drilling down the visual tree on-load to change it that way.
To get the default style & tenmplate go through this MSDN
Can also check step wise EXAMPLE from here.
Related
My problem is when I click or hover in ListViewItem which also show the silver background:
enter image description here
this is my code xaml:
<ListView
Margin="0,30,0,0"
Height="600"
ScrollViewer.VerticalScrollBarVisibility="Hidden"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
Name="ListViewFC" ItemsSource="{Binding ListWords, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedItem, Mode=TwoWay}" >
<ListView.ItemTemplate>
<DataTemplate>
<Border
Width="340"
x:Name="Border"
Height="80"
Background="Pink"
CornerRadius="15"
BorderThickness="1"
>
<Grid>
<TextBlock
VerticalAlignment="Center"
x:Name="txtContent"
Foreground="Black"
Text="{Binding Question1,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"
TextWrapping="NoWrap"
Margin="30 0 0 0"
FontSize="15"
/>
</Grid>
</Border>
<DataTemplate.Triggers>
<DataTrigger
Binding="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ListViewItem}}, Path=IsSelected}" Value="True">
<Setter TargetName="Border" Property="Background" Value="White" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
I want that When I hover or click It don't show the silver background.
pls, help me .Thanks.
Add this inside your ListView:
<ListView.Resources>
<Style BasedOn="{StaticResource TextBlockStyle}" TargetType="{x:Type TextBlock}" />
<Style BasedOn="{StaticResource ListViewItemStyle}" TargetType="{x:Type ListViewItem}" />
</ListView.Resources>
Then add this outside of your ListView (this displays a background of gold on hover):
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Gold" />
</Trigger>
</Style.Triggers>
</Style>
</ListView.ItemContainerStyle>
The default ControlTemplate of the ListView contains a Border with Padding of 2X. Hence you have to change its template something like this
<ListView.ItemContainerStyle>
<Style TargetType="{x:Type ListViewItem}">
<Setter Property="Background" Value="Transparent" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListViewItem}">
<ContentPresenter />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
I've got a DataTemplate which looks like this
<DataTemplate DataType="{x:Type viewModel:TreeViewLeafViewModel}">
<StackPanel Orientation="Horizontal">
<Image Name="leafImage"/>
<TextBlock Name="leafTextBlockDisplayName" VerticalAlignment="Center"/>
<TextBlock Name="leafTextBlockKeyGesture" VerticalAlignment="Center"/>
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Row, Converter={StaticResource MatchTypeConverter},
ConverterParameter={x:Type viewModel:TreeViewLeafViewModel}}" Value="True">
<Setter Property="Source" TargetName="leafImage" Value="{Binding Path=Row.Icon, Mode=OneTime}" />
<Setter Property="Text" TargetName="leafTextBlockDisplayName" Value="{Binding Path=Row.DisplayName, Mode=OneTime}" />
<Setter Property="Text" TargetName="leafTextBlockKeyGesture" Value="{Binding Path=Row.KeyGesture.KeyModifierString, Mode=OneTime}" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
I would like to replace the leafTextBlockKeyGesture by a TextBox if the IsEditing flag of the corresponding viewmodel is set to true. My Idea was to use a ContentControl inside the DataTemplate and change its Content depending on the IsEditing flag. I tried several solutions but I cannot find a working one.
Does anyone know how to do this?
Based on this answer you need something like this:
<StackPanel>
<StackPanel.Resources>
<DataTemplate x:Key="textbox">
<TextBox Text="edit me"/>
</DataTemplate>
<DataTemplate x:Key="textblock">
<TextBlock Text="can't edit"/>
</DataTemplate>
</StackPanel.Resources>
<CheckBox IsChecked="{Binding IsEditable}" Content="Editable"/>
<ContentControl Content="{Binding}">
<ContentControl.Style>
<Style TargetType="{x:Type ContentControl}">
<Setter Property="ContentTemplate" Value="{StaticResource textblock}" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsEditable}" Value="true">
<Setter Property="ContentTemplate" Value="{StaticResource textbox}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</StackPanel>
How do you conditionally style treeviewitemson binded properties
I'm running into an issue where I want to style items in a Tree View, those that are valid selections vs hierarchy items.
I've tried to move my style tag into a TreeView.Resources and a TreeView.ItemContainerStyle tag but it still doesn't cause any formatting.
<TabItem Name="Queries" Header="Queries"
d:DataContext="{d:DesignInstance views:QuerySettingsView}">
<Grid>
<TreeView ItemsSource="{Binding QueryTreeModels}"
Width="500" Height="200" VerticalAlignment="Top"
HorizontalAlignment="Center" Margin="0,0,175,0">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<HierarchicalDataTemplate.ItemContainerStyle>
<Style >
<Setter Property="TreeViewItem.IsExpanded"
Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="TreeViewItem.IsSelected"
Value="{Binding IsSelected, Mode=TwoWay}" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsQuery}">
<Setter Property="TextBlock.Foreground" Value="Chartreuse" />
</DataTrigger>
<DataTrigger Binding="{Binding IsFolder}">
<Setter Property="TextBlock.Foreground" Value="Crimson" />
</DataTrigger>
</Style.Triggers>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<TextBlock Text="{Binding Name}"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
</TabItem>
For DataTrigger you need to complete the condition by adding a value to DataTrigger bound field. like <DataTrigger Binding="{Binding IsQuery}" Value="true"> Refer the below code.
<TreeView x:Name="tree" Width="500" Height="200"
VerticalAlignment="Top" HorizontalAlignment="Center"
>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<HierarchicalDataTemplate.ItemContainerStyle>
<Style >
<Setter Property="TreeViewItem.IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="TreeViewItem.IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsQuery}" Value="true">
<Setter Property="TreeViewItem.Foreground" Value="Chartreuse" />
</DataTrigger>
<DataTrigger Binding="{Binding IsFolder}" Value="true">
<Setter Property="TreeViewItem.Foreground" Value="Crimson" />
</DataTrigger>
</Style.Triggers>
</Style>
</HierarchicalDataTemplate.ItemContainerStyle>
<TextBlock Text="{Binding NodeName}"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
I have a UserControl which contains a TreeView and a TextBlock:
<TreeView ItemsSource="{Binding FirstGeneration}" AllowDrop="True" Drop="TreeView_Drop" Width="300">
<TreeView.ItemContainerStyle>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
<Setter Property="FontWeight" Value="Normal" />
<Style.Triggers>
<Trigger Property="IsSelected" Value="True">
<Setter Property="FontWeight" Value="Normal" />
</Trigger>
</Style.Triggers>
</Style>
</TreeView.ItemContainerStyle>
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<StackPanel Orientation="Horizontal" >
<Image Source="{Binding Path=Image}" />
<TextBlock Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
<TextBlock Height="23" Name="textBlock1" Text="{Binding= ???}" Width="187" />
When I select an item of the treeview, I want do show some informations contained in the item (eg : the name of the selected item).
My problem is that I don't know how doing this binding, because when I select an item, the setter IsSelected of the item class is called.
Have you a best practice for doing that ?
Have a look at this in MSDN. And also the BindableSelectedItemBehaviour here.
My Xaml looks like this:
<TreeView Name="mainTree" ItemsSource="{Binding Folders}">
<TreeView.Resources>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Style.Triggers>
<!-- ??? -->
</Style.Triggers>
</Style>
<HierarchicalDataTemplate DataType="{x:Type local:FolderNode}" ItemsSource="{Binding Children}" >
<StackPanel Orientation="Horizontal" Name="myPanel">
<Image x:Name="treeImg" Width="16" Height="16" Source="Images/vsfolder_closed.png"/>
<TextBlock Text="{Binding Name}" />
</StackPanel>
<HierarchicalDataTemplate.Triggers>
<!-- ??? -->
</HierarchicalDataTemplate.Triggers>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
Now what I would like is if a treenode is expanded, the image source changes to Images/vsfolder_open.png...
What would be the easiest way to do that?
Thanks in advance!
Add a DataTrigger to the HierarchicalDataTemplate. Since you have two-way binding to the Property IsExpanded in the ViewModel you can bind to it and use TargetName because of the namescope in a DataTemplate.
<HierarchicalDataTemplate.Triggers>
<DataTrigger Binding="{Binding IsExpanded}" Value="True">
<Setter TargetName="treeImg"
Property="Source"
Value="Images/vsfolder_open.png"/>
</DataTrigger>
</HierarchicalDataTemplate.Triggers>