I'm trying to write a HeaderTemplate for an extender. So far, I've noticed all the examples use the {Binding} keyword to get the data from the header. However, what happens if there are multiple controls within the Header? How do I specify that those controls should be inserted at a specific location?
<Window.Resources>
<Style x:Key="ExpanderStyle" TargetType="{x:Type Expander}">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<!-- what do I put in here? -->
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<Expander Style="{StaticResource ExpanderStyle}">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock>Some Text</TextBlock>
<TextBlock Text="{Binding SomeBinding}" />
<Button />
</StackPanel>
</Expander.Header>
<Image Source="https://www.google.com/logos/2012/steno12-hp.jpg" />
</Expander>
Should I be moving my binding into the HeaderTemplate in the style and just overwriting whatever the Header in the Expander is?
You can use ContentPresenter to insert whatever the usual content would be into your Template
For example:
<Style x:Key="ExpanderStyle" TargetType="{x:Type Expander}">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Border BorderBrush="Blue" BorderThickness="2">
<ContentPresenter />
</Border>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
Header's property Content could contain only one object.
If you merge these object in one panel:
<StackPanel>
<TextBlock>Some Text</TextBlock>
<TextBlock Text="{Binding SomeBinding}" />
<Button />
</StackPanel>
then in template you could use {binding}
Related
I'm using MaterialDesignInXaml for stylize my application. Said that, I'm using a ListView with a CollectionViewGroup for group my items, anyway, in the GroupStyle I've this structure:
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}" >
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander IsExpanded="True">
<Expander.Header>
<DockPanel Height="16.5">
<TextBlock Text="{Binding Name.Name}" FontWeight="Bold" Foreground="White" FontSize="11.5" VerticalAlignment="Bottom" />
<TextBlock Text="{Binding ItemCount}" FontSize="11.5" Foreground="Orange" FontWeight="Bold" FontStyle="Italic" Margin="10,0,0,0" VerticalAlignment="Bottom" />
</DockPanel>
</Expander.Header>
<Border Style="{DynamicResource MaterialDesignPaper}">
<ItemsPresenter />
</Border>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
Now the problem is on this line: <Border Style="{DynamicResource MaterialDesignPaper}">, if I remove the border all working well, but with the xml above I get this exception:
System.Windows.Markup.XamlParseException: Unable to cast objects of type 'System.Windows.Media.SolidColorBrush' to type 'System.Windows.Style'. ---> System.InvalidCastException: Can not cast objects of type 'System.Windows.Media.SolidColorBrush' on the type 'System.Windows.Style'.
why happen this?
MaterialDesignPaper is a Brush, not a Style.
Therefore, depending on your requirement, you want something like this:
<Border BorderBrush="{DynamicResource MaterialDesignPaper}" />
or
<Border Background="{DynamicResource MaterialDesignPaper}" />
All Material Design In XAML Brushes are listed here: https://github.com/ButchersBoy/MaterialDesignInXamlToolkit/wiki/Brush-Names
After several hours I gave up.
I have the following ListView (in Grid) with GroupStyle defined inside of it.
I want to take it out somehow and put it in a Template or Style (I'm confused) and then add it to my main Style of the ListView (ListViewSimpleStyle).
This way it will be reusable in other places instead of copy-paste it every time.
How do I do it?
<ListView Name="LvDataBinding" Grid.Row="0"
Style="{StaticResource ListViewSimpleStyle}">
<!-- Define the grouping-->
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<TextBlock FontSize="12" Text="{Binding Name}"
Foreground="{StaticResource GrayForgroundBrush}"></TextBlock>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
Thanks
Groupstyle is style of Groupbox so we need to edit style of Groupbox and I have changed GroupBox HeaderTemplate as you want to change HeaderTemplate of GroupStyle.
Visit this:http://msdn.microsoft.com/en-us/library/ms754027(v=vs.90).aspx
and Add GroupBox With Its style in your own listview template style i.e ListViewSimpleStyle
<Style x:Key="ListViewSimpleStyle" TargetType="ListView">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListView">
<Grid Background="AliceBlue" >
<GroupBox>
<GroupBox.Style>
<Style TargetType="GroupBox">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<TextBlock FontSize="12" Text="{Binding Name}" Foreground="{StaticResource GrayForgroundBrush}"/>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupBox.Style>
</GroupBox>
<ItemsPresenter></ItemsPresenter>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
i have a Listbox, which stores two different object types, based on the same baseclass. (e.g. BaseObject = baseclass and the children of it: CustomPath and CustomImage)
The Datasource:
ObservableCollection<BattlegroundBaseObject> _baseObjectCollection;
public ObservableCollection<BattlegroundBaseObject> BaseObjectCollection
{
get { return _baseObjectCollection?? (_baseObjectCollection= new ObservableCollection<BaseObject>()); }
}
The Listbox databinding: <ListBox ItemsSource="{Binding BaseObjectCollection}"
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem" x:Name="ListBoxPathLineStyle">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem" x:Name="BattlegroundObjectControlTemplate">
<Path Stroke="{Binding ObjectColor}" StrokeThickness="{Binding StrokeThickness}" Data="{Binding PathGeometryData}" x:Name="PathLine" Opacity="{Binding Opacity}">
</Path>
<ControlTemplate.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Effect" TargetName="PathLine">
<Setter.Value>
<DropShadowEffect Color="CornflowerBlue" ShadowDepth="3" BlurRadius="10" />
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListBox.ItemContainerStyle>
I want to add to the ControlTemplate where the Path is, also a Image and to differ it by type or a property. doesnt matter.
anyone any ideas?
You can add to ListBox resources DataTemplate for each type.
In my example classes Car and Motorbike derived from Vehicle class.
<ListBox x:Name="listBox">
<ListBox.Resources>
<DataTemplate DataType="{x:Type local:Car}">
<StackPanel Background="Red">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type local:Motorbike}">
<StackPanel Background="Orange">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ListBox.Resources>
</ListBox>
EDIT:
You can add style for ListBoxItem to resources:
<ListBox x:Name="listBox">
<ListBox.Resources>
<Style TargetType="ListBoxItem">
<Style.Triggers>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Effect">
<Setter.Value>
<DropShadowEffect Color="CornflowerBlue" ShadowDepth="3" BlurRadius="10" />
</Setter.Value>
</Setter>
</Trigger>
</Style.Triggers>
</Style>
<DataTemplate DataType="{x:Type local:Car}">
<StackPanel Background="Red">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type local:Motorbike}">
<StackPanel Background="Orange">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ListBox.Resources>
</ListBox>
You could define some DataTemplates for your different classes. They determine how the classes are displayed. I've been using them to display derived classes differently when working with a collection of the base class.
<DataTemplate DataType="{x:Type CustomPath}">
<TextBlock Text="This is a CustomPath"/>
</DataTemplate>
<DataTemplate DataType="{x:Type CustomImage}">
<TextBlock Text="This is a CustomImage"/>
</DataTemplate>
At the moment you are changing the style of the controls that WPF is using to render your bound data. A better way to do this is to provide WPF with a way of generating the correct controls. Ignore the ListBoxItem and use DataTemplates for your actual objects.
First you need to tell the Window or control how to find your types.
<Window or UserControl
...
xmlns:model="clr-namespace:yourNamespace"
>
Then you can provide WPF with a way to show your objects e.g.
<DataTemplate TargetType="{x:Type model:CustomPath}">
<Path Stroke="{Binding ObjectColor}" StrokeThickness="{Binding StrokeThickness}"
Data="{Binding PathGeometryData}" x:Name="PathLine" Opacity="{Binding Opacity}"/>
<!-- maybe use a binding from the Path.Effect back to the IsSelected and ValueConverters
to re-apply the selection effect-->
</DataTemplate>
<DataTemplate TargetType="{x:Type model:CustomImage}">
<Image Src="{Binding SomeProperty}" />
</DataTemplate>
Now all you need to do is to make these available to the ListBox in some way. Almost every element in WPF can have .Resources added to it, so you could choose to do these across the entire window
<Window ...>
<Window.Resources>
<DataTemplate .../>
<DataTemplate .../>
</Window.Resources>
...
<ListBox .../>
</Window>
or you can apply it more locally
<Window ...>
...
<ListBox>
<ListBox.Resources>
<DataTemplate .../>
<DataTemplate .../>
</ListBox.Resources>
</ListBox>
</Window>
And this way your listbox definition can become much neater too, e.g. if you are using Window.Resources
<ListBox ItemsSource="{Binding BaseObjectCollection}"/>
I have ListBox with group style:
<GroupStyle HidesIfEmpty="True" x:Key="GroupStyle">
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Margin" Value="0,0,0,5"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True" BorderBrush="#FFA4B97F" BorderThickness="0,0,0,1">
<Expander.Header>
<DockPanel Background="LightSkyBlue"
Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Expander}},
Path=ActualWidth}">
<TextBlock FontWeight="Bold" Text="{Binding Path=Name}" Margin="5,0,0,0" Width="100"/>
<TextBlock FontWeight="Bold" Text="{Binding Path=ItemCount}"/>
</DockPanel>
</Expander.Header>
<Expander.Content>
<ItemsPresenter/>
</Expander.Content>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
Any change in bound collection causes expanders to reopen.
Is there any way to remember user preferences and leave expanders folded?
The question is what you are doing with the bound collection.
I agree with Nikolay that the best option is to have your viewmodel have a property that you will bind the expander to.
As for the question I've asked at the beginning: Are you somewhat refreshing the CollectionView?
Refresh causes the UI to be recreated. (Meaning, it is like Reset on an ObservableCollection. It tells the UI to create the user controls and load the XAML of your templates again which is bad for performance).
I can suggest a simple hack - just add IsExpanded property to your model class and bind Expander.IsExpanded to it.
I have ListBox with custom template, how do programmatically scroll it down to bottom?
Automatic Scrolling in a Silverlight List Box describes method of scrolling to bottom of ListBox. Unfortunately this method does not work with ListBox with custom style template.
Have anyone success to scroll ListBox with custom style?
Problem code:
<Grid.Resources>
<Style x:Key="HorizontalWrapListBox" TargetType="ListBox">
<Style.Setters>
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<toolkit:WrapPanel Orientation="Horizontal" />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBox">
<ScrollViewer>
<ItemsPresenter />
</ScrollViewer>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style.Setters>
</Style>
</Grid.Resources>
<ListBox x:Name="MyListBox" Margin="0,0,-12,0" ItemsSource="{Binding Items}"
Style="{StaticResource HorizontalWrapListBox}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Margin="0,0,0,17" Width="432" Height="78">
<TextBlock Text="{Binding LineOne}" TextWrapping="Wrap"
Style="{StaticResource PhoneTextExtraLargeStyle}"/>
<TextBlock Text="{Binding LineTwo}" TextWrapping="Wrap"
Margin="12,-6,12,0"
Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
You need to keep correct naming of your template parts and this could just start working. The ScrollViewer should be named x:Name="ScrollViewer". Check
ListBox Styles and Templates,
Customizing the Appearance of an Existing Control by Using a ControlTemplate,
TemplatePartAttribute