[英]How to get parent nodes in data grid group expander header
我在WPF應用程序中有一個帶有分組數據的datagrid。 對於組標題,我有一個上下文菜單刪除該組。 數據網格的項目源與我的對象綁定。 如何檢測擴展器標頭的父/母組? 我試圖這樣做,但它返回null。
private void buttonDeleteHeader_Click(object sender, RoutedEventArgs e)
{
MenuItem menuItem = sender as MenuItem;
TextBlock header = menuItem.Parent as TextBlock;
}
數據分組
m_infoList = new ObservableCollection<MyDataObject>();
m_infoList .Add(new MyDataObject
{ ID = 1, Attr1 = "Level1", Attr2 = "Level2", Attr3 ="Level3", Attr4 = "Child1"});
m_infoList .Add(new MyDataObject
{ ID = 2, Attr1 = "Level1", Attr2 = "Level2", Attr3 ="Level3", Attr4 = "Child2"});
CollectionView collectionView = (CollectionView)CollectionViewSource.GetDefaultView(m_infoList);
PropertyGroupDescription groupDescription1 = new PropertyGroupDescription("Attr1");
PropertyGroupDescription groupDescription2 = new PropertyGroupDescription("Attr2");
PropertyGroupDescription groupDescription3 = new PropertyGroupDescription("Attr3");
collectionView.GroupDescriptions.Clear();
collectionView.GroupDescriptions.Add(groupDescription1);
collectionView.GroupDescriptions.Add(groupDescription2);
collectionView.GroupDescriptions.Add(groupDescription3);
用戶界面
數據網格代碼
<DataGrid x:Name="dataGrid"
ItemsSource="{Binding InfoList, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" ....>
...
<DataGrid.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander x:Name="MyExpander" IsExpanded="True">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock x:Name="MyExpanderHeader" Text="{Binding Name}" FontWeight="Bold" VerticalAlignment="Bottom"
ToolTip="Right click to delete">
<TextBlock.ContextMenu>
<ContextMenu>
<MenuItem Header="Delete" Click="buttonDeleteHeader_Click">
</MenuItem>
</ContextMenu>
</TextBlock.ContextMenu>
</TextBlock>
</StackPanel>
</Expander.Header>
<ItemsPresenter Margin="20,0,0,0"/>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
</DataGrid>
做這個 :
MenuItem item = sender as MenuItem;
ContextMenu ctxMenu = (ContextMenu) item.Parent;
// ctxMenu.Parent will give you `Popup`
TextBlock tb = (TextBlock) ctxMenu.PlacementTarget;
要遍歷這些級別,可以使用RelativeSource
及其AncestorLevel
屬性(如果使用的是Binding
,並且可以以編程方式使用VisualTreeHelper
類並像這樣向上遍歷:
DependencyObject parent = VisualTreeHelper.GetParent(tb);
while (parent.GetType() != typeof(Expander))
parent = VisualTreeHelper.GetParent(parent);
使用探聽工具檢查視覺樹,然后進行相應遍歷。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.