|ZYCWPF| 用户自控件继承了RichTextBox，那如何用MVVM方式为他里面的RichTextBox添加SelectionChanged事件呢？谢谢

Question

                <ControlTemplate TargetType="{x:Type control:ZRichTextBox}">
                    <DockPanel LastChildFill="True">
                        <Border DockPanel.Dock="Top" SnapsToDevicePixels="True"
                            BorderBrush="{TemplateBinding ToolbarBorderBrush}"
                            BorderThickness ="{TemplateBinding ToolbarBorderThickness}">
                        </Border>
                        <ScrollViewer x:Name="PART_ContentHost" VerticalScrollBarVisibility="Auto"  HorizontalScrollBarVisibility="Auto"
                                      Background="{TemplateBinding Background}" z:MouseLeftButtonUp.Command="{Binding OnRichTextBoxMouseLeftButtonUp}"
                                       z:RichTextBoxSelectionChanged.Command="{Binding OnRichTextBoxSelectionChanged}">
                        </ScrollViewer>    </DockPanel>
                </ControlTemplate>
           
我可以给RichTextBox添加MouseLeftButtonUp事件，我想是因为ScrollViewer有这个事件
但是这个RichTextBoxSelectionChanged事件就绑定不上了谢谢

Answer 1

你写错啦，SelectionChanged的事件参数是RoutedEventArgs，不是 SelectionChangedEventArgs。ScrollViewer可以添加MouseLeftButtonUp事件，准确地说应该是MouseLeftButtonUp是RoutedEvent，它会bubble到ScrollViewer

Answer 2

哦
有点相不明白的是
<ScrollViewer x:Name="PART_ContentHost" VerticalScrollBarVisibility="Auto"  HorizontalScrollBarVisibility="Auto"
                                      Background="{TemplateBinding Background}" z:MouseLeftButtonUp.Command="{Binding OnRichTextBoxMouseLeftButtonUp}"
                                       z:RichTextBoxSelectionChanged.Command="{Binding OnRichTextBoxSelectionChanged}">
                            <!--<AdornerDecorator x:Name="PART_ContentHost" />-->
                        </ScrollViewer>
这里的是ScrollViewer 为什么会响应我的RichTextBox事件？

Answer 3

因为ScrollViewer的name设成了特殊的PART_ContentHost，这个是rtb的宿主，rtb会在里面生成自己的visual tree，然后事件都会顺着层次结构bubble到这个容器中。

Answer 4

好，谢谢
怪不午那个我调协 为Text的话不显示内容