JournalEntryUnifiedViewConverter merges navigation back history and navigation forward history (as exposed by Frame or NavigationWindow) into a single, Windows Internet Explorer 7-style navigation menu.
Inheritance Hierarchy
Namespace:
System.Windows.Navigation
Assembly:
PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
Syntax
Public NotInheritable Class JournalEntryUnifiedViewConverter _
Implements IMultiValueConverter
public sealed class JournalEntryUnifiedViewConverter : IMultiValueConverter
public ref class JournalEntryUnifiedViewConverter sealed : IMultiValueConverter
[<Sealed>]
type JournalEntryUnifiedViewConverter =
class
interface IMultiValueConverter
end
XAML Object Element Usage
<JournalEntryUnifiedViewConverter .../>
The JournalEntryUnifiedViewConverter type exposes the following members.
Constructors
Attached Properties
|
| Name | Description |
|---|
.gif) | JournalEntryPosition | Gets or sets a value that specifies whether an entry is in back navigation history, forward navigation history, or is the current content of a navigator. |
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Methods
Fields
Remarks
Both Frame and NavigationWindow display navigation chrome that supports history navigation using the following mechanisms:
A button for navigating back one piece of content at a time.
A button for navigating forward one piece of content at a time.
An Windows Internet Explorer 7-style drop-down list that shows:
A combined list of up to nine items in back navigation history and up to nine items in forward navigation history.
The position of the current piece of content with respect to both back and forward navigation history.
The navigation history is stored by both NavigationWindow and Frame in the following properties:
Back Navigation History: Frame..::.BackStack, NavigationWindow..::.BackStack.
Forward Navigation History: Frame..::.ForwardStack, NavigationWindow..::.ForwardStack.
To create the Windows Internet Explorer 7-style drop-down list, NavigationWindow and Frame use JournalEntryUnifiedViewConverter to merge their individual back navigation history and forward navigation history into a single list of navigation history entries. The resulting list contains up to nine entries from back navigation history and up to nine entries from forward navigation history, plus an entry for the current content.
If you create custom navigation UI, and need to provide an Windows Internet Explorer 7-style drop-down list, you can use JournalEntryUnifiedViewConverter to similar effect.
XAML Attribute Usage
This class is not typically used in XAML.
Examples
The following example shows how to construct a text-based navigation history menu. The menu uses JournalEntryUnifiedViewConverter to combine both the back and forward navigation histories of the hosted Frame navigator.
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:presentationFramework="clr-namespace:System.Windows.Navigation;assembly=presentationframework"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="JournalEntryUnifiedPositionConverterSnippets"
>
<Window.Resources>
<presentationFramework:JournalEntryUnifiedViewConverter x:Key="JournalEntryUnifiedViewConverter" />
<!--MenuItem data template-->
<DataTemplate x:Key="JournalEntryMenuItemTemplate">
<MenuItem VerticalContentAlignment="Center" Command="NavigationCommands.NavigateJournal" CommandTarget="{Binding ElementName=frame}" CommandParameter="{Binding RelativeSource={RelativeSource Self}}">
<MenuItem.Template>
<ControlTemplate>
<TextBlock>
<TextBlock Text="{Binding (JournalEntryUnifiedViewConverter.JournalEntryPosition)}" FontWeight="Bold"></TextBlock>
<LineBreak />
<TextBlock Text="{Binding Path=Name}" />
</TextBlock>
</ControlTemplate>
</MenuItem.Template>
</MenuItem>
</DataTemplate>
</Window.Resources>
<DockPanel>
<!--Unified navigation history menu-->
<Menu DockPanel.Dock="Top">
<MenuItem Header="Unified Navigation History" ItemTemplate="{DynamicResource JournalEntryMenuItemTemplate}">
<MenuItem.ItemsSource>
<MultiBinding Converter="{StaticResource JournalEntryUnifiedViewConverter}">
<MultiBinding.Bindings>
<Binding ElementName="frame" Path="BackStack"/>
<Binding ElementName="frame" Path="ForwardStack" />
</MultiBinding.Bindings>
</MultiBinding>
</MenuItem.ItemsSource>
</MenuItem>
</Menu>
<!--Navigator (Frame with its navigation chrome hidden-->
<Frame Name="frame" NavigationUIVisibility="Hidden" Source="HomePage.xaml" />
</DockPanel>
</Window>
Version Information
.NET Framework
Supported in: 4, 3.5, 3.0
.NET Framework Client Profile
Supported in: 4, 3.5 SP1
Platforms
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Thread Safety
Any public
static (
Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
See Also