ListViewItem IsKeyboardFocusWithin不觸發視圖模型上的IsSelectedChange

Question

我有一個樣式TreeListViewItem ...真的只是一個ListViewItem「樹結構」。 ListViewItem的DataContext設置爲我的視圖模型，該模型的IsSelected屬性綁定到該項目的IsSelected。我做了一個更改，以便在選擇該項目時，對項目進行不同的樣式設置，並將viewmodel上的屬性設置爲「true」。這很好，但是當我添加了一個觸發器IsKeyboardFocusWithin時，viewmodel屬性不再被設置。該項目的風格仍然改變，但我需要視圖模型上的屬性也改變。任何幫助都會很棒。

XAML：

<Style TargetType="{x:Type zcorectl:ZynTreeListViewItem}"> 
    <Setter Property="KeyboardNavigation.TabNavigation" Value="Continue"/> 
    <Setter Property="IsExpanded" Value="{Binding Path=IsExpanded, Mode=TwoWay}"/> 
    <Setter Property="IsSelected" Value="{Binding Path=IsSelected, UpdateSourceTrigger=PropertyChanged}"/> 
    <Setter Property="Template"> 
     <Setter.Value> 
      <ControlTemplate TargetType="{x:Type zcorectl:ZynTreeListViewItem}"> 
       <StackPanel> 
        <Border x:Name="Bd" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"> 
         <GridViewRowPresenter x:Name="PART_Header" Content="{TemplateBinding Header}" Columns="{StaticResource columns}" /> 
        </Border> 
        <ItemsPresenter x:Name="ItemsHost"/> 
       </StackPanel> 
       <ControlTemplate.Triggers> 
        <Trigger Property="IsExpanded" Value="false"> 
         <Setter TargetName="ItemsHost" Property="Visibility" Value="Collapsed"/> 
        </Trigger> 
        <MultiTrigger> 
         <MultiTrigger.Conditions> 
          <Condition Property="HasHeader" Value="false"/> 
          <Condition Property="Width" Value="Auto"/> 
         </MultiTrigger.Conditions> 
         <Setter TargetName="PART_Header" Property="MinWidth" Value="75"/> 
        </MultiTrigger> 
        <MultiTrigger> 
         <MultiTrigger.Conditions> 
          <Condition Property="HasHeader" Value="false"/> 
          <Condition Property="Height" Value="Auto"/> 
         </MultiTrigger.Conditions> 
         <Setter TargetName="PART_Header" Property="MinHeight" Value="19"/> 
        </MultiTrigger> 
        <Trigger Property="IsKeyboardFocusWithin" Value="True"> 
          <Setter Property="IsSelected" Value="True"/> 
        </Trigger> 
        <Trigger Property="IsSelected" Value="true"> 
         <Setter TargetName="Bd" Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> 
         <Setter TargetName="Bd" Property="BorderThickness" Value="0,2"/>               
         <Setter TargetName="Bd" Property="Height" Value="45"/>               
         <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/> 
         </Trigger> 
         <MultiTrigger>               
          <MultiTrigger.Conditions> 
           <Condition Property="IsSelected" Value="true"/> 
           <Condition Property="IsSelectionActive" Value="false"/>                 
          </MultiTrigger.Conditions>               
          <Setter TargetName="Bd" Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/> 
          <Setter TargetName="Bd" Property="BorderThickness" Value="0,2"/>               
          <Setter TargetName="Bd" Property="Height" Value="45"/>               
          <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>               
         </MultiTrigger> 
         <Trigger Property="IsEnabled" Value="false"> 
          <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> 
         </Trigger> 
        </ControlTemplate.Triggers> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 

視圖模型代碼：

private bool _isSelected = false; 
public bool IsSelected 
{ 
    get { return _isSelected; } 
    set 
    { 
     if (_isSelected != value) 
     { 
      _isSelected = value; 
      OnPropertyChanged("IsSelected"); 
     } 
    } 
} 

Answer 1

爲什麼不創建視圖模型一個KeyboardFocus財產，並把邏輯呢？

private bool _isKeyboardFocusSet = false; 
public bool IsKeyboardFocusSet 
{ 
    get { return _isKeyboardFocusSet; } 
    set 
    { 
     if (_isKeyboardFocusSet!= value) 
     { 
     _isKeyboardFocusSet = value; 
     OnPropertyChanged("isKeyboardFocusSet"); 
     } 
     if (_isSelected != true) 
     { 
     _isSelected = _isKeyboardFocusSet; 
     OnPropertyChanged("IsSelected"); 
     } 
    } 
}