I want to create a TabControl with a number of "static" TabItems (explicitly typed in XAML) and a number of dynamically added TabItems. To achieve this I tried to use a CompositeCollection as the TabControl.ItemSource.
Sample code:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
>
<Window.Resources>
<x:Array x:Key="SomeTexts" x:Type="sys:String">
<sys:String>Text1</sys:String>
<sys:String>Text2</sys:String>
</x:Array>
</Window.Resources>
<TabControl>
<TabControl.ItemsSource>
<CompositeCollection>
<TabItem Header="Test">
<StackPanel>
<TextBlock x:Name="MyText" Text="Blah" />
<TextBlock Text="{Binding Text, ElementName=MyText}" />
</StackPanel>
</TabItem>
<CollectionContainer Collection="{StaticResource SomeTexts}" />
</CompositeCollection>
</TabControl.ItemsSource>
</TabControl>
</Window>
This example has one fixed tab item and three "dynamic" tab items (note that 'SomeTexts' is a fixed array here just to ease the example; in the real code it will be a dynamic collection).
The example works except for the 'ElementName' binding, which does not work. I suppose this is because the CompositeCollection is not a Freezable (see also Why is CompositeCollection not Freezable?).
Does anyone has a solution?
I had a similar scenario. To solve this I found the following article.
This post explains how to create a freezable proxy object that you can set your data context to. You then add this proxy as a resource that can be referenced as a static resource. See the following:
public class BindingProxy : Freezable
{
public static DependencyProperty DataContextProperty = DependencyProperty.Register(
"DataContext", typeof(object), typeof(BindingProxy), new UIPropertyMetadata(null));
public object DataContext
{
get { return GetValue(DataContextProperty); }
set { SetValue(DataContextProperty, value); }
}
protected override Freezable CreateInstanceCore()
{
return new BindingProxy();
}
}
This can then be used in your xaml like this:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:y="clr-namespace:Namespace.Of.BindingProxy"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
>
<Window.Resources>
<x:Array x:Key="SomeTexts" x:Type="sys:String">
<sys:String>Text1</sys:String>
<sys:String>Text2</sys:String>
</x:Array>
<y:BindingProxy x:Key="Proxy" DataContext="{Binding}" />
</Window.Resources>
<TabControl>
<TabControl.ItemsSource>
<CompositeCollection>
<TabItem Header="Test">
<StackPanel>
<TextBlock x:Name="MyText" Text="Blah" />
<TextBlock Text="{Binding DataContext.SomeProperty, Source={StaticResource Proxy}}" />
</StackPanel>
</TabItem>
<CollectionContainer Collection="{StaticResource SomeTexts}" />
</CompositeCollection>
</TabControl.ItemsSource>
</TabControl>
</Window>
Related
I try to create a "container" user control that can display UIElement objects as child in WPF. The usage of the control should look like this:
<general:DisplayContainer Title="Hello">
<TextBlock x:Name="AnyUIElement" />
</general:DisplayContainer>
where the TextBlock is just an example. So far I created the UserControl and bind the Title property like this:
<Grid x:Name="Grid_Main">
<Border x:Name="Border_Main" BorderThickness="2" Margin="10" CornerRadius="5" Padding="7" />
<TextBlock x:Name="TextBlock_Title" Background="{Binding Background, ElementName=Grid_Main}" HorizontalAlignment="Left" VerticalAlignment="Top" Text="{Binding Path=Title, FallbackValue=Title}" Margin="20,2,0,0" Padding="3,0" />
</Grid>
The Codebehind file looks like this:
public partial class DisplayContainer : UserControl
{
public DisplayContainer()
{
InitializeComponent();
this.DataContext = this;
}
public string Title
{
get { return (string)GetValue(TitleProperty); }
set { SetValue(TitleProperty, value); }
}
public static readonly DependencyProperty TitleProperty =
DependencyProperty.Register("Title",typeof(string), typeof(DisplayContainer));
}
Now, how can I modify my control in a way, that i accepts a child element in the XAML-file, when I use the control? The child should be displayed through the Border_Main.Child Property.
Thanks in advance,
Frank
Just set the UserControl's Template property
<UserControl ...>
<UserControl.Template>
<ControlTemplate TargetType="UserControl">
<StackPanel>
<TextBlock Text="{Binding Title,
RelativeSource={RelativeSource AncestorType=UserControl}}"/>
<ContentPresenter />
</StackPanel>
</ControlTemplate>
</UserControl.Template>
</UserControl>
and put the displayed element in the UserControl's Content:
<local:DisplayContainer Title="A Title">
<TextBlock Text="Hello"/>
</local:DisplayContainer>
Or you could define a DisplayContainer as a ContentControl without a .xaml file but with a ControlTemplate:
public partial class DisplayContainer : ContentControl
{
public DisplayContainer()
{
this.DataContext = this;
}
public string Title
{
get { return (string)GetValue(TitleProperty); }
set { SetValue(TitleProperty, value); }
}
public static readonly DependencyProperty TitleProperty =
DependencyProperty.Register("Title", typeof(string), typeof(DisplayContainer));
}
XAML:
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="300" Width="300">
<Window.Resources>
<Style TargetType="local:DisplayContainer">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:DisplayContainer">
<Grid x:Name="Grid_Main">
<Border x:Name="Border_Main" BorderThickness="2" Margin="10" CornerRadius="5" Padding="7">
<ContentPresenter />
</Border>
<TextBlock x:Name="TextBlock_Title" Background="{Binding Background, ElementName=Grid_Main}"
HorizontalAlignment="Left" VerticalAlignment="Top"
Text="{Binding Path=Title, RelativeSource={RelativeSource AncestorType=local:DisplayContainer}, FallbackValue=Title}" Margin="20,2,0,0" Padding="3,0" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
<StackPanel>
<local:DisplayContainer Title="Hello">
<TextBlock Text="AnyUIElement..." />
</local:DisplayContainer>
</StackPanel>
</Window>
Or, yet another way.
Create a DependencyProperty 'Child' of type UIElement in DisplayContainer
Add a ContentPresenter to Border_Main that has it's content bound to the Child DependencyProperty.
Mark DisplayContainer with the ContentProperty attribute (value of "Child")
You can add many DPs if you needed to have different sections. Just add more ContentPresenters bound to the different DPs (Child, Header, Footer, etc..).
DisplayContainer.cs
[System.Windows.Markup.ContentProperty("Child")]
public partial class DisplayContainer : UserControl
{
public DisplayContainer()
{
InitializeComponent();
}
public string Title
{
get { return (string)GetValue(TitleProperty); }
set { SetValue(TitleProperty, value); }
}
public static readonly DependencyProperty TitleProperty = DependencyProperty.Register("Title", typeof(string), typeof(DisplayContainer));
public UIElement Child
{
get { return (UIElement)GetValue(ChildProperty); }
set { SetValue(ChildProperty, value); }
}
public static readonly DependencyProperty ChildProperty = DependencyProperty.Register("Child", typeof(UIElement), typeof(DisplayContainer));
}
DisplayContainer.xaml
<UserControl x:Class="WpfApp19.DisplayContainer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WpfApp19"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid x:Name="Grid_Main">
<Border x:Name="Border_Main" BorderThickness="2" Margin="10" CornerRadius="5" Padding="7">
<ContentPresenter Content="{Binding Child, RelativeSource={RelativeSource AncestorType=UserControl}}" />
</Border>
<TextBlock x:Name="TextBlock_Title" Background="{Binding Background, ElementName=Grid_Main}" HorizontalAlignment="Left" VerticalAlignment="Top" Text="{Binding Path=Title, FallbackValue=Title, RelativeSource={RelativeSource AncestorType=UserControl}}" Margin="20,2,0,0" Padding="3,0" />
</Grid>
</UserControl>
MainWindow.xaml
<Window x:Class="WpfApp19.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:general="clr-namespace:WpfApp19"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<general:DisplayContainer Title="Hello">
<StackPanel>
<TextBlock Text="Test1" />
<TextBlock Text="Test2" />
</StackPanel>
<!-- Alternative way of setting Child - if you had more DPs (Header, Footer, etc..) you would have to set their content this way
<general:DisplayContainer.Child>
<TextBlock Text="AnyUIElement" />
</general:DisplayContainer.Child>
-->
</general:DisplayContainer>
</Grid>
</Window>
Can I bind StringFormat inside a Binding to another Binding?
Text="{Binding DeficitDollars, StringFormat=\{0:E6\}}"
Text="{Binding GNP, StringFormat={Binding LocalCurrencyFormat}}"
You can't use a Binding for StringFormat. As the exception tells you if you try it:
A 'Binding' can only be set on a DependencyProperty of a
DependencyObject
StringFormat is not a DependencyProperty and Binding is not a DependencyObject.
You can do these two things though.
Setting it to a resource.
You can define your different string formats in App.xaml in the Resources so they'll be reachable in the whole application:
<system:String x:Key="LocalCurrencyFormat">{0:C}</system:String>
system is xmlns:system="clr-namespace:System;assembly=mscorlib"
And then you can do:
<TextBlock Text="{Binding MyDouble, StringFormat={StaticResource LocalCurrencyFormat}}" />
Setting it to a static property of a class.
You can have a class with all your different string formats:
public static class StringFormats
{
public static string LocalCurrencyFormat
{
get { return "{0:C}"; }
}
}
And use it in the Binding the following way:
<TextBlock Text="{Binding MyDouble, StringFormat={x:Static local:StringFormats.LocalCurrencyFormat}}" />
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Width="500" Height="500">
<Window.Resources>
<sys:String x:Key="LocalCurrencyFormat">Total: {0:C}</sys:String>
</Window.Resources>
<StackPanel>
<TextBlock Text="{Binding DeficitDollars, StringFormat=\{0:E6\}}"></TextBlock>
<TextBlock Text="{Binding Path=GNP, StringFormat={StaticResource LocalCurrencyFormat}}" />
</StackPanel>
</Window>
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBox Name="myTxt" Text="{Binding}" />
</Grid>
</Window>
namespace WpfApplication1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = "fdfsfds";
}
}
}
I wonder why this code isn't working? It throws an exception. What should I do to bind textBox?
The default Binding for TextBox.Text property - is TwoWay
"Two-way binding requires Path or XPath."
So, you can use OneWay Binding:
<Grid>
<TextBox Name="myTxt" Text="{Binding Mode=OneWay}" />
</Grid>
If you still want TwoWay binding you may use this code:
<TextBox Name="myTxt" Text="{Binding Path=DataContext, RelativeSource={RelativeSource Self}}" />
I`m trying to figure out why this code
<UserControl x:Class="TestSilverlight.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400">
<UserControl.Resources>
<Button x:Key="button" Content="{Binding}" />
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="Yellow">
<ListBox Name="listBox">
<ListBox.ItemTemplate>
<DataTemplate>
<ContentControl Content="{StaticResource button}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
using System.Collections.Generic;
namespace TestSilverlight
{
public partial class MainPage
{
public MainPage()
{
InitializeComponent();
listBox.ItemsSource = new List<string> {"a", "b", "c"}; //without this line it works
}
}
}
doesnt work. It throws Parser Exception (can`t set property Content in ContentControl). Without binding it works perfectly. Is it ok?
It looks like there is something wrong with your logic. If you define a resource of type Button - that makes one instance of a button. You can't have a single instance of a control be a content of multiple controls.
Why not just do this:
<ListBox Name="listBox">
<ListBox.ItemTemplate>
<DataTemplate>
<Button Content="{Binding}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<StackPanel x:Name="stkWaitingPatients" Width="300" Margin="0,0,0,-3"
DataContext="{Binding Mode=OneWay, Source={StaticResource local:oPatients}}">
I'm getting StaticResource reference 'local:oPatients' was not found.
Here is the codebehind:
public partial class MainWindow : Window
{
ListBox _activeListBox;
clsPatients oPatients;
public MainWindow()
{
oPatients = new clsPatients(true);
...
To be able to address the object as a StaticResource, it needs to be in a resource dictionary. However, since you're creating the object in MainWindow's constructor, you can set the DataContext in the code-behind like so.
oPatients = new clsPatients(true);
stkWaitingPatients.DataContext = oPatients;
And then change the Binding to this:
{Binding Mode=OneWay}
This is an ok practice if you're not going to be changing the DataContext again, otherwise you'd want a more flexible solution.
Edit: You mentioned ObjectDataProvider in your comment. Here's how you'd do that. First, add an xmlns:sys to the Window for the System namespace (I'm assuming you already have one for xmlns:local):
xmlns:sys="clr-namespace:System;assembly=mscorlib"
Then you can add an ObjectDataProvider to your resource dictionary like this:
<Window.Resources>
<ObjectDataProvider
x:Key="bindingPatients"
ObjectType="{x:Type local:clsPatients}">
<ObjectDataProvider.ConstructorParameters>
<sys:Boolean>True</sys:Boolean>
</ObjectDataProvider.ConstructorParameters>
</ObjectDataProvider>
</Window.Resources>
And refer to it in a Binding with the StaticResource markup like this, using the same string we specified in the x:Key attached property we gave it in the dictionary:
{Binding Source={StaticResouce bindingPatients}, Mode=OneWay}
Edit 2: Ok, you posted more code in your answer, and now I know why it's throwing an exception during the constructor. You're attempting to do this...
lstWaitingPatients.DataContext = oPatients;
... but lstWaitingPatients doesn't actually exist until after this.InitializeComponent() finishes. InitializeComponent() loads the XAML and does a bunch of other things. Unless you really need to do something before all of that, put custom startup code after the call to InitalizeComponent() or in an event handler for Window's Loaded event.
The following sets the ItemsSource in Code Behind and correctly handles the DataBinding:
public partial class MainWindow : Window
{
public MainWindow()
{
clsPatients oPatients = new clsPatients(true);
//assuming oPatients implements IEnumerable
this.lstWaitingPatients.ItemsSource = oPatients;
And the XAML:
<ListBox x:Name="lstWaitingPatients"
IsSynchronizedWithCurrentItem="true"
ItemTemplate="{StaticResource WaitingPatientsItemTemplate}"
FontSize="21.333" Height="423.291"
ScrollViewer.VerticalScrollBarVisibility="Visible"
GotFocus="lstWaitingPatients_GotFocus"
/>
Now, I can't get this to work...I get a general Windows startup error.
Here is the codebehind with the Initializer and the class being instantiated:
public partial class MainWindow : Window
{
ListBox _activeListBox;
public MainWindow()
{
clsPatients oPatients = new clsPatients(true);
lstWaitingPatients.DataContext = oPatients;
this.InitializeComponent();
Here's the top of my XAML:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Orista_Charting"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
x:Class="Orista_Charting.MainWindow"
x:Name="windowMain"
Title="Orista Chart"
Width="1024" Height="768" Topmost="True" WindowStartupLocation="CenterScreen" Activated="MainWindow_Activated" >
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Resources/ButtonStyles.xaml"/>
<ResourceDictionary Source="Resources/OtherResources.xaml"/>
<ResourceDictionary Source="Resources/TextBlockStyles.xaml"/>
<ResourceDictionary Source="Resources/Converters.xaml"/>
</ResourceDictionary.MergedDictionaries>
Here's the pertinent XAML, as you see, I went ahead and moved the DataContext down to the ListBox from the StackPanel. This doesn't run, but it does render in Design View (however, with no data present in the ListBox):
<!-- Waiting Patients List -->
<Border BorderThickness="1,1,1,1" BorderBrush="#FF000000" Padding="10,10,10,10"
CornerRadius="10,10,10,10" Background="#FFFFFFFF" Margin="15.245,187.043,0,41.957" HorizontalAlignment="Left" >
<StackPanel x:Name="stkWaitingPatients" Width="300" Margin="0,0,0,-3">
<StackPanel Orientation="Horizontal">
<TextBlock Text="Waiting Patients:" VerticalAlignment="Center" FontSize="21.333" Margin="0,0,0,20"/>
<TextBlock HorizontalAlignment="Right" Margin="0,0,38.245,0" Width="139" Height="16"
Text="Minutes Waiting" TextWrapping="Wrap" Foreground="#FF9C2525" FontWeight="Bold" VerticalAlignment="Bottom"
TextAlignment="Right"/>
<!-- Too be implemented, this is the wait animation -->
<!--<Image x:Name="PollGif" Visibility="{Binding Loading}"
HorizontalAlignment="Left" Margin="100,0,0,0" Width="42.5" Height="42.5"
Source="Images/loading-gif-animation.gif" Stretch="Fill"/>-->
</StackPanel>
<ListBox x:Name="lstWaitingPatients"
DataContext="{Binding Mode=OneWay}" ItemsSource="{Binding Mode=OneWay}"
IsSynchronizedWithCurrentItem="true"
ItemTemplate="{StaticResource WaitingPatientsItemTemplate}"
FontSize="21.333" Height="423.291" ScrollViewer.VerticalScrollBarVisibility="Visible"
GotFocus="lstWaitingPatients_GotFocus"
/>
</StackPanel>
</Border>
Ok, but if I just take comment out the assigment line in the codebehind, it does run (albeit with no data in the listbox):
public partial class MainWindow : Window
{
ListBox _activeListBox;
public MainWindow()
{
clsPatients oPatients = new clsPatients(true);
//lstWaitingPatients.DataContext = oPatients;
THANKS!