WPF: template ou UserControl avec 2 (ou plus!) ContentPresenters de présenter du contenu dans "machines à sous"

Hasta la victoria siempre!

je suis venu avec la solution de travail (d'abord sur internet, il me semble :))

La délicate DialogControl.XAML.cs-voir les commentaires:

public partial class DialogControl : UserControl
{
    public DialogControl()
    {
        InitializeComponent();

        //The Logical tree detour:
        // - we want grandchildren to inherit DC from this (grandchildren.DC = this.DC),
        // but the children should have different DC (children.DC = this),
        // so that children can bind on this.Properties, but grandchildren bind on this.DataContext
        this.InnerWrapper.DataContext = this;
        this.DataContextChanged += DialogControl_DataContextChanged;
        // need to reinitialize, because otherwise we will get static collection with all buttons from all calls
        this.Buttons = new ObservableCollection<FrameworkElement>();
    }


    void DialogControl_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        /* //Heading is ours, we want it to inherit this, so no detour
        if ((this.GetValue(HeadingProperty)) != null)
            this.HeadingContainer.DataContext = e.NewValue;
        */

        //pass it on to children of containers: detours
        if ((this.GetValue(ControlProperty)) != null)
            ((FrameworkElement)this.GetValue(ControlProperty)).DataContext = e.NewValue;

        if ((this.GetValue(ButtonProperty)) != null)
        {
            foreach (var control in ((ObservableCollection<FrameworkElement>) this.GetValue(ButtonProperty)))
            {
                control.DataContext = e.NewValue;
            }
        }
    }

    public FrameworkElement Control
    {
        get { return (FrameworkElement)this.GetValue(ControlProperty); } 
        set { this.SetValue(ControlProperty, value); }
    }

    public ObservableCollection<FrameworkElement> Buttons
    {
        get { return (ObservableCollection<FrameworkElement>)this.GetValue(ButtonProperty); }
        set { this.SetValue(ButtonProperty, value); }
    }

    public string Heading
    {
        get { return (string)this.GetValue(HeadingProperty); }
        set { this.SetValue(HeadingProperty, value); }
    }

    public static readonly DependencyProperty ControlProperty =
            DependencyProperty.Register("Control", typeof(FrameworkElement), typeof(DialogControl));
    public static readonly DependencyProperty ButtonProperty =
            DependencyProperty.Register(
                "Buttons",
                typeof(ObservableCollection<FrameworkElement>),
                typeof(DialogControl),
                //we need to initialize this for the designer to work correctly!
                new PropertyMetadata(new ObservableCollection<FrameworkElement>()));
    public static readonly DependencyProperty HeadingProperty =
            DependencyProperty.Register("Heading", typeof(string), typeof(DialogControl));
}

et la commande de dialogue.xaml (pas de changement):

<UserControl x:Class="TkMVVMContainersSample.Views.Common.DialogControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"
    >
    <DockPanel x:Name="InnerWrapper">
        <DockPanel 
            LastChildFill="False" 
            HorizontalAlignment="Stretch" 
            DockPanel.Dock="Bottom">
            <ItemsControl
                x:Name="ButtonsContainer"
                ItemsSource="{Binding Buttons}"
                DockPanel.Dock="Right"
                >
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <Border Padding="8">
                            <ContentPresenter Content="{TemplateBinding Content}" />
                        </Border>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
                <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                        <StackPanel Orientation="Horizontal" Margin="8">
                        </StackPanel>
                    </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
            </ItemsControl>
        </DockPanel>
        <Border 
            Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
            Padding="8,0,8,8"
            >
            <StackPanel>
                <Label
                    x:Name="HeadingContainer"
                    Content="{Binding Heading}"
                    FontSize="20"
                    Margin="0,0,0,8"  />
                <ContentPresenter
                    x:Name="ControlContainer"
                    Content="{Binding Control}"                 
                    />
            </StackPanel>
        </Border>
    </DockPanel>
</UserControl>

exemple d'utilisation:

<Window x:Class="TkMVVMContainersSample.Services.TaskEditDialog.ItemEditView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Common="clr-namespace:TkMVVMContainersSample.Views.Common"
    Title="ItemEditView"
    >
    <Common:DialogControl>
        <Common:DialogControl.Heading>
            Edit item
        </Common:DialogControl.Heading>
        <Common:DialogControl.Control>
            <!-- Concrete dialog's content goes here -->
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>

                <Label Grid.Row="0" Grid.Column="0">Name</Label>
                <TextBox Grid.Row="0" Grid.Column="1" MinWidth="160" TabIndex="1" Text="{Binding Name}"></TextBox>
                <Label Grid.Row="1" Grid.Column="0">Phone</Label>
                <TextBox Grid.Row="1" Grid.Column="1" MinWidth="160" TabIndex="2" Text="{Binding Phone}"></TextBox>
            </Grid>
        </Common:DialogControl.Control>
        <Common:DialogControl.Buttons>
            <!-- Concrete dialog's buttons go here -->
            <Button Width="80" TabIndex="100" IsDefault="True" Command="{Binding OKCommand}">OK</Button>
            <Button Width="80" TabIndex="101" IsCancel="True" Command="{Binding CancelCommand}">Cancel</Button>
        </Common:DialogControl.Buttons>
    </Common:DialogControl>

</Window>

si vous utilisez un UserControl

je suppose que vous voulez vraiment:

<ContentPresenter Content="{Binding Buttons}"/>

cela suppose que le DataContext passé à votre contrôle possède une propriété de boutons.

et avec un tempsde contrôle

l'autre option serait un ControlTemplate et alors vous pourriez utiliser:

<ContentPresenter ContentSource="Header"/>

vous auriez besoin d'être templating un contrôle qui a en fait un "Header" pour faire cela (normalement un HeaderedContentControl).