WPF DataTemplate 获取 Flowdocument

Question

我的 EvenementViewModel 有两个 DataTemplate，一个用于只读 (LectureEvenement)，第二个用于写入 (EditeurEvenement)。根据 EvenementViewModel 状态选择模板。这些模板在 TabControl 中使用。

从后面的代码（单击按钮），我想获取只读 DataTemplate 中的 FlowDocument。目标是打印 FlowDocument。

我需要帮助来获取 TabControl 的选定选项卡中的 FlowDocument 句柄。

有什么建议吗？

有部分 XAML 代码。

<Window.Resources>
    <DataTemplate x:Key="EditeurEvenement" DataType="{x:Type local:EvenementViewModel}">
        <ScrollViewer Name="Conteneur" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
            <StackPanel MaxWidth="1000">
                <Border BorderThickness="5" BorderBrush="#55CDD7E1">
                    <StackPanel Background="#55CDD7E1">
                        <!-- Centrale -->
                        <StackPanel DockPanel.Dock="Top" Margin="0,0,0,5" HorizontalAlignment="Left">
                            <TextBlock VerticalAlignment="Center"><Run Text="Centrale :" FontWeight="Bold"/></TextBlock>
                            <ComboBox MinWidth="160" ItemsSource="{Binding ListeCentrale}" DisplayMemberPath="Nom" SelectedItem="{Binding Centrale}"/>
                        </StackPanel>
...
                        </StackPanel>
                </Border>
            </StackPanel>
        </ScrollViewer>
    </DataTemplate>

    <DataTemplate x:Key="LectureEvenement" DataType="{x:Type local:EvenementViewModel}">
        <FlowDocumentScrollViewer VerticalScrollBarVisibility="Auto">
            <FlowDocument FontFamily="Sergoe UI" FontSize="12px" Name="FdEvenement">
                <Paragraph>
                    <!-- Centrale -->
                    <TextBlock Margin="0,0,0,5"><Run Text="Centrale : " FontWeight="Bold"/><Run Text="{Binding Centrale.Nom, Mode=OneWay}"/></TextBlock>
                    <LineBreak/>
...
                </Paragraph>
            </FlowDocument>
        </FlowDocumentScrollViewer>
    </DataTemplate>

    <DataTemplate DataType="{x:Type local:EvenementViewModel}">
        <ContentControl Content="{Binding}">
            <ContentControl.Style>
                <Style TargetType="{x:Type ContentControl}">
                    <Setter Property="ContentTemplate" Value="{StaticResource LectureEvenement}"></Setter>
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding EstModifiable}" Value="True">
                            <Setter Property="ContentTemplate" Value="{StaticResource EditeurEvenement}"></Setter>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ContentControl.Style>
        </ContentControl>
    </DataTemplate>
</Window.Resources>

    <TabControl x:Name="TcEvenements" ItemsSource="{Binding ListeOngletOuvert}" SelectedItem="{Binding OngletSelectionne}">
        <TabControl.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding TitreTab}" Margin="0,0,5,0" VerticalAlignment="Center"/>
                    <Button CommandParameter="{Binding DataContext, RelativeSource={RelativeSource AncestorType={x:Type Window}}}" Command="{Binding LancerFermer}">
                        <Image Source="Icone/icons8-delete-23.png" Width="15"/>
                    </Button>
                </StackPanel>
            </DataTemplate>
        </TabControl.ItemTemplate>
    </TabControl>

Answer 1

无论何时应用您的模板，FlowDocumentScrollViewer 元素都是 TabControl 的视觉子元素。然后，您可以使用 VisualTreeHelper class:

获取对它的引用

private void Button_Click(object sender, RoutedEventArgs e)
{
    FlowDocumentScrollViewer fdsv = FindVisualChild<FlowDocumentScrollViewer>(TcEvenements);
    if (fdsv != null)
    {
        FlowDocument fd = fdsv.Document;
        //...
    }
}

private T FindVisualChild<T>(Visual visual) where T : Visual
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(visual); i++)
    {
        Visual child = (Visual)VisualTreeHelper.GetChild(visual, i);
        if (child != null)
        {
            T correctlyTyped = child as T;
            if (correctlyTyped != null)
            {
                return correctlyTyped;
            }

            T descendent = FindVisualChild<T>(child);
            if (descendent != null)
            {
                return descendent;
            }
        }
    }

    return null;
}

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