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ListView ignoring DataTemplates when using a ControlTemplate
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Closed 3 years ago.
Why does the implementation of ItemContainerStyle (detailed below) cause the individual data column bindings to fail on an otherwise working ListView/GridView?
Here is the visual result of the failure where the total items in 3 rows are shown but not the individual column items:
Implementation without the overridden ItemContainerStyle:
Actual Goal Before answering the question consider what my ultimate goal is for an alternate workaround. I want a GridView like structure where each row has a drop shadow; preferably shown on the selected item/on hover operation to make the row pop. As somewhat shown on the failure example above
Code
<ListView ItemsSource="{StaticResource People}">
<!--Comment this out to see working display-->
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListViewItem">
<Grid Background="White" Margin="20">
<Grid.Effect>
<DropShadowEffect />
</Grid.Effect>
<ContentPresenter Content="{TemplateBinding Content}"
ContentTemplate="{TemplateBinding ContentTemplate}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ListView.ItemContainerStyle>
<!--End Failure Point-->
<ListView.View>
<GridView >
<GridViewColumn Header="First" DisplayMemberBinding="{Binding Path=First}" />
<GridViewColumn Header="Last" DisplayMemberBinding="{Binding Path=Last}" />
<GridViewColumn Header="Phone" DisplayMemberBinding="{Binding Path=Phone}" />
</GridView>
</ListView.View>
</ListView>
To reproduce you will need
StaticResource Data defined in Xaml
xmlns:model="clr-namespace:{your namespace}.Model"
<UserControl.Resources>
<model:People x:Key="People">
<model:Person First="Joe" Last="Smith" Phone="303-555-5555"/>
<model:Person First="Jenny" Last="Johnson" Phone="720-867-5309" />
<model:Person First="Frank" Last="Wright" Phone="202-555-5555" />
</model:People>
</UserControl.Resources>
People.cs in Model namspace
public class People : List<Person> { }
public class Person
{
public string First { get; set; }
public string Last { get; set; }
public string Phone { get; set; }
}
The ContentPresenter is the wrong node type to use for the ControlTemplate of the ItemContainerStyle.
To fix change ContentPresenter to GridViewRowPresenter and also remove ContentTemplate as such:
<ControlTemplate TargetType="ListViewItem">
<Grid Background="White" Margin="20">
<Grid.Effect>
<DropShadowEffect />
</Grid.Effect>
<GridViewRowPresenter Content="{TemplateBinding Content}"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
</Grid>
</ControlTemplate>
Visual Result
Related
I am creating a container whose style will be used across the application. It essentially is a 'pop up' but won't spawn in a new window. The general structure of my app is one NavigationWindow and many pages. So I get started with the following Template, defined in my Resource Dictionary:
<ControlTemplate x:Key="RainbowModalTemplate" TargetType="{x:Type Control}">
<Canvas Height="540" Canvas.Left="492" Canvas.Top="296" Width="945">
<Border x:Name="Modal" Height="540" Width="945" Background="#ec2016" BorderBrush="White" BorderThickness="2" CornerRadius="15" Style="{DynamicResource RainbowModalBox}">
<Border.Clip>
<RectangleGeometry RadiusX="15" RadiusY="15" Rect="0,0,945,540"/>
</Border.Clip>
<Image Source="Resources/RainbowModal/rainbow.png" Height="247" Width="947" Margin="0,0,0,0" VerticalAlignment="Bottom" d:LayoutOverrides="Height" Stretch="UniformToFill" Canvas.Left="-2" Canvas.Top="293" ClipToBounds="True" />
</Border>
</Canvas>
</ControlTemplate>
So when I want to 'consume' this, I want to be able to implement this control but provide my own content inside, (buttons, text, etc). However because I am new to WPF I am unsure what control or controls to use, and what structure to lay this out as. Below is sample 'consumer' of the object. Someone will click a button in the application and that will set this objects' visibility to be Visible :
<Control x:Name="RequestMoreInfoModal" Template="{DynamicResource RainbowModalTemplate}" Canvas.Left="494" Canvas.Top="250" Visibility="Collapsed"></Control>
I know this probably isn't the most kosher way to do this, so I am open to suggestion. My specific concerns:
I know "Control" isn't the right type. But I don't know what is appropriate and it appears Canvas and other controls do not allow Templating. What control should I use?
how do I implement this Template and also allow the consumer to define their own content within the Template?
What I eneded up doing is using a ControlTemplate and ContentPresenter.
Here is the definition of the reusable content in my ResourceDictionary:
<ControlTemplate x:Key="RainbowModal" TargetType="ContentControl">
<Canvas>
<Border x:Name="Modal" Height="540" Width="945" Background="#ec2016" BorderBrush="White" CornerRadius="15" BorderThickness="2" Style="{DynamicResource RainbowModalBox}">
<Border.Clip>
<RectangleGeometry
RadiusX="{Binding CornerRadius.TopLeft, RelativeSource={RelativeSource AncestorType={x:Type Border}}}"
RadiusY="{Binding RadiusX, RelativeSource={RelativeSource Self}}"
Rect="0,0,945,540"/>
</Border.Clip>
<Canvas>
<Image Source="Resources/RainbowModal/rainbow.png" Height="247" Width="947" Margin="0,0,0,0" VerticalAlignment="Bottom" Stretch="UniformToFill" Canvas.Left="-2" Canvas.Top="293" ClipToBounds="True" />
<ContentPresenter/>
</Canvas>
</Border>
</Canvas>
</ControlTemplate>
And here is the 'consumption' of that content.
<ContentControl x:Name="RequestMoreInfoModal" Canvas.Left="489" Canvas.Top="122" Template="{StaticResource RainbowModal}" Visibility="Collapsed">
<Canvas>
<TextBlock FontSize="78" Foreground="White" Width="903" Canvas.Top="28" Canvas.Left="20" Height="298" Text="Scan your card to receive an email with more information." TextWrapping="Wrap" FontFamily="Serif72 Beta" TextAlignment="Center" />
<Button Width="250" Height="76" Content="CLOSE" Margin="350,350" Style="{DynamicResource PurpleInfoButton}" FontSize="28" Click="Button_Click_1" ></Button>
</Canvas>
</ContentControl>
I have a WPF UserControl, which is simply a Label for whatever else it goes with. E.g, a Label for a TextBox. I want to place this TextBox inside the LabeledControl markup, like this:
<LabeledControl Label="First name">
<TextBox Binding="{FirstName}" />
</LabeledControl>
The reason I want to do this is to style the way controls and their labels look.
I can't find an obvious way to do this. Am I even approaching this the right way? Should I be looking at templates instead?
I'd say that a better option would be to use the built-in HeaderedContentControl, which allows you to specify a Header (your label) and a Content (your text box) property.
You can then specify a ControlTemplate for the HeaderedContentControl to alter the appearance:
<Style x:Key="MyLabelledItemStyle" TargetType="HeaderedContentControl">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="HeaderedContentControl">
<StackPanel Orientation="Horizontal">
<ContentControl Content="{TemplateBinding Header}" Margin="2" />
<ContentControl Content="{TemplateBinding Content}" Margin="2" />
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
This example just concatenates the two components horizontally in a StackPanel, but you could do something more complicated if required.
You can then use this in XAML as below:
<HeaderedContentControl Style="{StaticResource MyLabelledItemStyle}" Header="First Name">
<TextBox Text="{Binding FirstName}" />
</HeaderedContentControl>
I have the following resource in my window that declares how a certain kind of TabItem should look like.
<Window.Resources>
<StackPanel x:Key="TabSearchContents" x:Shared="False"
Orientation="Vertical">
<Border
BorderThickness="3"
BorderBrush="Purple">
<TextBlock
Text="SEARCH BOOKS"
FontFamily="Verdana"
FontSize="25"
Foreground="Blue"
HorizontalAlignment="Center" />
</Border>
<StackPanel
Height="30"
Orientation="Horizontal"
Margin="5">
<TextBox
x:Name="txtSearch"
Width="650"
FontFamily="Comic Sans MS"
Foreground="Chocolate" />
<Button
x:Name="btnSearch"
Width="100"
Content="Go!"
Click="BtnSearch_Click" />
</StackPanel>
<Grid x:Name="gridResults">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="450"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ScrollViewer Grid.Column="0" VerticalScrollBarVisibility="Auto">
<ItemsControl x:Name="itmsSearch" ItemsSource="{Binding}" Padding="4"
ItemTemplate="{StaticResource SearchResultItemDT}">
</ItemsControl>
</ScrollViewer>
<StackPanel x:Name="stkpnlDetails">
</StackPanel>
</Grid>
</StackPanel>
</Window.Resources>
Then, in my code-behind, I dynamically create a tab and assign to the TabControl that is already present in my window.
void BtnNewTab_Click(object sender, RoutedEventArgs e)
{
TabItem tb = new TabItem();
tb.Content = this.Resources["TabSearchContents"];
tb.DataContext = _bridge.SearchBooksByTitle("e");
tb.Header = "Wuttp yo!";
Button btnGo = ((Button)tb.FindName("btnSearch"));
ItemsControl i = (ItemsControl)tb.FindName("itmsSearch");
btnGo.Resources.Add("ResultList", i);
daTabs.Items.Add(tb);
tb.Focus();
}
I want to access the btnSearch Button that is declared in my XAML resource.
As it is, this code throws an exception since btnGo turns out to be null (as well as i) since it can't find the expected control via FindName().
I read about the RegisterName() method, but it requires a reference to an instance of the required control... which I don't have.
I dont think you should define your button like this, try defining it in a style, creating a button and assigning the button that style, i think you will be able to get what you are going for this way.
myTheme.xaml
<ResourceDictionary
<Style x:Key="btnSearch" TargetType="{x:Type Button}">
<Setter Property="Width" Value="100"/>
<Setter Property="Content" Value="Go!"/>
<Setter Property="Click" Value="btn_Click"/>
</Style>
ResourceDictionary/>
myCode.cs
Button btnGo = new Button;
btnGo.Style = "{DynamicResource btnSearch}";
Hope this helps,
Eamonn
I am fairly new to WPF, and am a bit stuck, so any help would be appreciated.
I am trying to write WPF custom control that encapsulates several elements of functionality that I already having working (i.e sorting, filtering, standard menus, etc.), but in a nice neat package to avoid repetition.
Anyway I have created the custom control (based on control), and then have the following in the Generic.Xaml
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Controls.ListViewExtended">
<Style TargetType="{x:Type local:ListViewExtended}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:ListViewExtended}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<ListView>
<ListView.View>
<GridView>
<!-- Content goes here -->
</GridView>
</ListView.View>
</ListView>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
When I try to add GridViewColumns (or any control really), as below ...
<elv:ListViewExtended>
<GridView>
<GridViewColumn Width="140" Header="Column 1" />
<GridViewColumn Width="140" Header="Column 2" />
<GridViewColumn Width="140" Header="Column 3" />
</GridView>
</elv:ListViewExtended>
I get the "... does not support direct content" error.
I have created a dependancy property (again below) that allows the adding of GridView, but it still doesn't work.
public static DependencyProperty GridViewProperty;
public static string GridViewHeader(DependencyObject target)
{
return (string)target.GetValue(GridViewProperty);
}
public static void GridViewHeader(DependencyObject target, string value)
{
target.SetValue(GridViewProperty, value);
}
Thanks in advance
All You need is to specify ContentPropertyAttribute.
[ContentProperty("MainContent")]
public class GroupPanel : Control
{
public GroupPanel()
{
DefaultStyleKey = typeof(GroupPanel);
}
public object MainContent
{
get { return GetValue(MainContentProperty); }
set { SetValue(MainContentProperty, value); }
}
public static readonly DependencyProperty MainContentProperty =
DependencyProperty.Register("MainContent", typeof(object), typeof(GroupPanel), null);
}
Reference: http://msdn.microsoft.com/en-us/library/system.windows.markup.contentpropertyattribute(v=vs.90).aspx
I use this simple solution in our projects to support direct content in custom controls:
Add a "CustomControl" to your project and derive this control from class "UserControl" instead of "Control":
public class MyCustomControl: UserControl
{
static MyCustomControl()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(MyCustomControl),
new FrameworkPropertyMetadata(typeof(MyCustomControl)));
}
}
When you add a CustomControl to your project, Visual Studio (I am using 2012) automatically adds a folder "Themes" including a file named "Generic.xaml".
This file holds a ResourceDictionary to define the style (template) of your CustomControl.
You will find a basic template for your CustomControl, already used as DefaultStyle. For direct content support place a ContentPresenter somewhere inside this template with parent content binding:
<Style TargetType="{x:Type local:MyCustomControl}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:MyCustomControl}">
<Border Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content}" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Now it's possible to add content to your CustomControl:
<Window x:Class="MyApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:MyApplication"
Title="MainWindow" Height="350" Width="525">
<Grid>
<controls:MyCustomControl>
<TextBlock>Hello</TextBlock>
</controls:MyCustomControl>
</Grid>
</Window>
Hope this helps!
Inherit your custom control from the ListView, not from the Control. This would definitely cause you to change the template, but I encourage you to read more documentation on how to do it (e.g. Sacha Barber's article: Creating and consuming a custom WPF control).
Good luck in your learning!
Don't use
{Binding MainContent ElementName=Self}
Use
Content="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=MainContent}" />
Could have saved me so much time with that.
I have defined a style in app.xaml. This style contains several text TextBlocks which I would like to controle as I apply the style to an object, in this case a UserPin.
How can I access these TextBlocks runtime?
I get the style by:
Style = Application.Current.Resources["UserPin"] as Style;
The style looks like this:
<Style x:Name="UserPin" TargetType="RRML_UserControls:UserPin" >
<Setter Property="RenderTransformOrigin" Value="0.5,0.5" />
<Setter Property="AnchorPoint" Value="0.5,0.5" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="RRML_UserControls:UserPin">
<Grid Height="71.969" Width="Auto">
<Grid.RenderTransform>
<ScaleTransform x:Name="PART_PinScale" />
</Grid.RenderTransform>
<Grid.RowDefinitions>
<RowDefinition Height="29"/>
<RowDefinition Height="16"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.247*"/>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="0.753*"/>
</Grid.ColumnDefinitions>
<Image Height="Auto" Source="Resources/Users.png" x:Name="PART_imgUser" VerticalAlignment="Top" Stretch="Uniform" Margin="0,0,0,0" Grid.Column="1">
<Image.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</Image.RenderTransform>
</Image>
<TextBlock HorizontalAlignment="Center" Margin="0,0,0,0" Width="Auto" Grid.Column="0" Grid.ColumnSpan="3" Grid.Row="1" TextWrapping="Wrap" VerticalAlignment="Center" TextAlignment="Center" x:Name="txtBottom" Text="{Binding Mode=OneWay, Path=LocationName}">
<TextBlock.DataContext>
<RRML_RRMLServiceReference:Location LocationName="Initial Name"/>
</TextBlock.DataContext>
</TextBlock>
<TextBlock HorizontalAlignment="Right" Margin="0,0,0,0" VerticalAlignment="Center" Text="L" TextWrapping="Wrap"/>
<TextBlock Margin="0,0,0,0" Text="R" TextWrapping="Wrap" d:LayoutOverrides="Width, Height" Grid.Column="2" HorizontalAlignment="Left" VerticalAlignment="Center"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
The TextBlock value I'm trying to set is txtBottom.
As you can see I have tried to apply a datacontext and a databinding to the field. This works, but all objects get the value "Initial Name" of course.
My questions are:
how can I apply my datacontext so txtBottom.Text changes, or
how can I change the value of the TextBlock named txtBottom without databinding?
in short can I access these fields or properties at all?
Runtime :)
So far I have found that Triggers may be used only in WPF.
I think of something like this:
var styledobject = new NiceObject();
styledobject.Style = Application.Current.Resources["UserPin"] as Style;
styledobject.DataContext = locationData;
Where locationData is my object containing data.
If anyone wonders; I am placing icons on a map and want to name them.
You should not explicitly apply DataContext on the TextBlock. DataContext is inherited by child FrameworkElements. You should try to set data context explicitly as little and as high up the Visual Tree as possible (for your own sanity's sake :-))
If this is a custom control, you can override on the OnApplyTemplate method and use the GetTemplateChild(string name) to retrieve references to named elements within your control.
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
TextBlock txtBottom = GetTemplateChild("txtBottom") as TextBlock;
}
Externally, if you must, you can imperatively access that specific control at runtime using an extension method to traverse the Visual Tree to find it by name.
public static T FindChild<T>(this DependencyObject element, string name)
where T : FrameworkElement
{
//Code to find the control
}