I have a treeview inside of a dockpanel and all of the elements of the treeview are inside HierarchicalDataTemplates. Here is the code:
<DockPanel Margin="10,10,0,0" VerticalAlignment="Stretch" Grid.Row="0" Grid.RowSpan="5" Grid.Column="0">
<DockPanel.Resources>
<src:TreeViewFilter x:Key="MyList" />
<HierarchicalDataTemplate DataType="{x:Type src:TreeViewParent}" ItemsSource="{Binding Path=OrderAttributes}">
<TextBlock Text="{Binding Path=Name}" FontSize="24"/>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type src:OrderAttribute}" ItemsSource="{Binding Path=OrderAttributes}">
<TextBlock Text="{Binding Path=NameAndCount}" FontSize="16"/>
</HierarchicalDataTemplate>
</DockPanel.Resources>
<TreeView Name="treeView1" BorderThickness="2" ItemsSource="{Binding Source={StaticResource MyList}, UpdateSourceTrigger=PropertyChanged}" TreeViewItem.Selected="treeViewFilter"/>
</DockPanel>
As you can see, the DockPanel wraps around the TreeView. The icons I am trying to add would be in the second HierarchicalDataTemplate which binds to a string and displays as a textbox. Depending on the name of the "NameAndCount", I would choose an icon to be displayed next to it on the left.
Any ideas on a solution for my example? Or do I need to think about using different templates like StackPanel?
Add an Image-Control wherever you want, bind its Source to "NameAndCount" and use a IValueConverter to convert it to an image-path.
Related
We are going to develop a behavior tree editor using WPF.
However, we are totally new to WPF.
How to generate shape components that represent tree nodes and the components should be able to respond to mouse event like right mouse clicked.
Do you have any suggestions on this?
You can specify different HierarchicalDataTemplate for your tree. They get chosen automatically by classname. You can also specify one for your base type. Be sure not to use interfaces, but real classes.
So if you use different classes for your view models you can get along with something like this:
<TreeView
ItemsSource="{Binding MyTreeVariable}"
SelectedItemChanged="MyTree_SelectedItemChanged">
<TreeView.Resources>
<HierarchicalDataTemplate ItemsSource="{Binding Path=Children}" DataType="{x:Type self:MyBaseType}">
<StackPanel Orientation="Horizontal">
<Rectangle Width="16" Height="16"/>
<TextBlock Text="{Binding Path=Name}"/>
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Path=Children}" DataType="{x:Type self:MySpecialType1}">
<StackPanel Orientation="Horizontal">
<Ellipse Width="16" Height="16"/>
<TextBlock Text="{Binding Path=Name}"/>
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Path=Children}" DataType="{x:Type self:MySpecialType2}">
<StackPanel Orientation="Horizontal">
<!--- Triangle -->
<Polygon Points="50,0 100,100 0,100" Width="16" Height="16"/>
<TextBlock Text="{Binding Path=Name}"/>
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
If you like to tell the different behaviors by data, you can use DataTrigger and Setter, but I`d recommend the way shown above.
I've started to learn about WPF. And I've chosen to build simple ItemStructureCreator.
I am using MVVM pattern as well.
I implemented some classes, and faced an problem to properly bind it to my TreeView.
Now I want my StructureManagerView to have TreeView control assosiated with my structure.
I tried to bind it like this:
<TreeView Name="tree" DataContext="{Binding MainItem}" Grid.Column="0" Background="Beige">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Item.Children}">
<TextBlock Text="{Binding Item.Code}" HorizontalAlignment="Stretch"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
Or like this (Here I think is wrong cause ItemsSource property expects collection):
<TreeView Name="tree" ItemsSource="{Binding MainItem}" Grid.Column="0" Background="Beige">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Item.Children}">
<TextBlock Text="{Binding Item.Code}" HorizontalAlignment="Stretch"/>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
Can you please help me to set Bindigs correctly.
Regards, Dmitry.
Converting My comment into an answer:
The TreeView doesn't have the concept of a "Main Item".
You should Bind the ItemsSource Property of the TreeView Itself.
ItemsSource="{Binding MainItem}"
should be replaced by
ItemsSource="{Binding MainItems}"
where MainItems is an IEnumerable
I have a TreeView bound to an MVVM observable collection.
My item template is composed by an image and a textblock like the following code show:
<HierarchicalDataTemplate x:Key="TreeViewItemTemplate" ItemsSource="{Binding Items, Mode=OneWay, NotifyOnSourceUpdated=True}">
<TreeViewItem>
<TreeViewItem.Header>
<StackPanel Orientation="Horizontal">
<Image
Margin="-20,0,5,0"
Source="{Binding Icon, Converter={StaticResource TreeViewIconConverter}, Mode=OneWay}"
Style="{DynamicResource SmallIcon}"/>
<Label Content="{Binding Label}"/>
</StackPanel>
</TreeViewItem.Header>
</TreeViewItem>
</HierarchicalDataTemplate>
The problem happens when you Click over an item. If the Mouse cursor is over the StackPanel, the selection will not happen.
I have included also a screenshot to make this more clear.
Of course this happens because the StackPanel is now over the selection area.
Is there any workaround?
I found the answer by myself.
When you customize the TreeView using an hierarchical data template then you should not replicate the TreeViewItem.Header template because at runtime WPF will create one for you.
So, in order to have a custom TreeViewItem this code is enough:
<HierarchicalDataTemplate x:Key="TreeViewItemTemplate" ItemsSource="{Binding Items, Mode=OneWay, NotifyOnSourceUpdated=True}">
<StackPanel Orientation="Horizontal">
<Image
Margin="0,0,5,0"
Source="{Binding Icon, Converter={StaticResource TreeViewIconConverter}, Mode=OneWay}"
Style="{DynamicResource SmallIcon}"/>
<Label Content="{Binding Label}"/>
</StackPanel>
</HierarchicalDataTemplate>
I have a data bound Listbox as shown below. I want the textblock that holds the data to wrap. And I have not been able to.
What is the problem here?
Here is my code:
<DataTemplate x:Key="policyLbTemplate">
<StackPanel>
<TextBlock Text="{Binding name}" FontWeight="Bold"/>
<TextBlock Text="{Binding description}" TextWrapping="Wrap" />
</StackPanel>
</DataTemplate>
<ListBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch" ItemsSource="{Binding Policies}"
ItemTemplate="{StaticResource policyLbTemplate}"
HorizontalContentAlignment="Stretch" />
You need to add one property to the list box: ScrollViewer.HorizontalScrollBarVisibility="Disabled", then the text will wrap (otherwise it grows offscreen). I have done it in the following code and it works fine for me.
<ListBox Name="lstbIcons" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch"
VerticalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding UserActionName}" FontWeight="Bold"/>
<TextBlock Text="{Binding Description}" TextWrapping="Wrap" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
This is most likely because there is nothing restricting the width of the TextBlock so that it is growing offscreen. Do Horizontal scrollbars appear?
See the following related questions and try the solutions described:
WP7 TextBlock inside a ListBox not wrapping text
Force TextBlock to wrap in WPF ListBox
windows phone 7 TextBlock TextWrapping not honored in listbox
http://social.msdn.microsoft.com/forums/en-US/wpf/thread/37236ac6-05c3-4acc-baca-abc871ba64e0
I'm trying to create a user control that is a combobox that, when opened, presents a treeview of heirarchal data.
I created the user control and replaced a portion of the template in Popup with:
<ScrollViewer x:Name="ScrollViewer" BorderThickness="0" Padding="1">
<sdk:TreeView x:Name="Tree">
</sdk:TreeView>
</ScrollViewer>
However, I'm not sure how to enable binding on this. The treeview needs to be bound to a different datacontext than the combobox. I tried implementing a DependencyProperty on the user control that would allow me to set the datacontext, but I'm definitely not going about it the right way. At this point, all I get is an empty treeview.
Any help on this would be greatly appreciated.
P.S. One additional caveat is that I need to template the treeview like so:
<sdk:TreeView x:Name="Tree">
<sdk:TreeView.ItemTemplate>
<sdk:HierarchicalDataTemplate ItemsSource="{Binding ChildUnits}">
<StackPanel Orientation="Vertical" Width="200">
<TextBlock x:Name="name" TextWrapping="Wrap" Text="{Binding Name}" FontWeight="Bold" />
<TextBlock x:Name="type" Text="{Binding Id}" FontStyle="Italic" FontSize="10" Foreground="Gray" />
</StackPanel>
</sdk:HierarchicalDataTemplate>
</sdk:TreeView.ItemTemplate>
</sdk:TreeView>