【发布时间】：2018-03-06 06:30:46
【问题描述】：
我有一个多达 4 个级别的多级 TreeView，如下所示：
<HierarchicalDataTemplate ItemsSource="{Binding TestModuleStatementList}" x:Key="level4" ItemTemplate="{StaticResource level5}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="600"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Margin="1,1,0,1" Name="lblStatementName" Style="{StaticResource TreeLabelStyle}" MouseLeftButtonUp="ViewTestDataTree_MouseLeftButtonUp" MouseRightButtonUp="ViewTestDataTree_MouseRightButtonUp" Padding="2,2,2,2" Text="{Binding DisplayText}" />
<Border Grid.Column="1" Margin="0,0,-2,0" Style="{StaticResource BorderStylePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockPassCountStyleTestData}"/>
</Border>
<Border Grid.Column="2" Margin="0,0,-2,0" Style="{StaticResource BorderStyleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockFailCountStyleTestData}"/>
</Border>
<Border Grid.Column="3" Margin="0,0,-2,0" Style="{StaticResource BorderStyleModulePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockModulePassCountStyleTestData}"/>
</Border>
<Border Grid.Column="4" Margin="0,0,-2,0" Style="{StaticResource BorderStyleModuleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockModuleFailCountStyleTestData}"/>
</Border>
</Grid>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding TestModules}" x:Key="level3" ItemTemplate="{StaticResource level4}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="620"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Margin="1,1,0,1" Name="lblCategoryName" Style="{StaticResource TreeLabelStyle}" MouseLeftButtonUp="ViewTestDataTree_MouseLeftButtonUp" MouseRightButtonUp="ViewTestDataTree_MouseRightButtonUp" Padding="2,2,2,2" Text="{Binding DisplayText}" />
<Border Grid.Column="1" Margin="0,0,-2,0" Style="{StaticResource BorderStylePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockPassCountStyleTestData}"/>
</Border>
<Border Grid.Column="2" Margin="0,0,-2,0" Style="{StaticResource BorderStyleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockFailCountStyleTestData}"/>
</Border>
<Border Grid.Column="3" Margin="0,0,-2,0" Style="{StaticResource BorderStyleModulePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockModulePassCountStyleTestData}"/>
</Border>
<Border Grid.Column="4" Margin="0,0,-2,0" Style="{StaticResource BorderStyleModuleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockModuleFailCountStyleTestData}"/>
</Border>
</Grid>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding TestModuleCategories}" x:Key="level2" ItemTemplate="{StaticResource level3}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="640"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Margin="1,1,1,1" Name="lblDeviceName" MouseLeftButtonUp="ViewTestDataTree_MouseLeftButtonUp" MouseRightButtonUp="ViewTestDataTree_MouseRightButtonUp" ToolTip="{Binding DisplayText}" Style="{StaticResource TreeLabelStyle}" Padding="2,2,2,2" Text="{Binding DisplayText}" />
<TextBox Grid.Column="0" Margin="1,1,1,1" Name="DeviceNameTextBox" LostFocus="TextBox_LostFocus"
Text="{Binding RenameDeviceText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
PreviewKeyDown="TextBox_PreviewKeyDown"
Padding="2,2,2,2" MaxLength="100"
Visibility="{Binding Path=Edit, Converter={StaticResource BoolToVisibilityCollapsedConverter}, UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}">
<TextBox.CommandBindings>
<CommandBinding Command="Paste" CanExecute="CommandBinding_CanExecute"/>
</TextBox.CommandBindings>
</TextBox>
<Border Grid.Column="1" Margin="0,0,-1,0" Style="{StaticResource BorderStylePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockPassCountStyleTestData}"/>
</Border>
<Border Grid.Column="2" Margin="0,0,-1,0" Style="{StaticResource BorderStyleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockFailCountStyleTestData}"/>
</Border>
<Border Grid.Column="3" Margin="0,0,-1,0" Style="{StaticResource BorderStyleModulePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockModulePassCountStyleTestData}"/>
</Border>
<Border Grid.Column="4" Margin="0,0,-1,0" Style="{StaticResource BorderStyleModuleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockModuleFailCountStyleTestData}"/>
</Border>
</Grid>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding TestRuns}" x:Key="level1" ItemTemplate="{StaticResource level2}" >
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="660"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
<ColumnDefinition Width="130"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Margin="1,1,2,1" Name="lblProjectName" MouseLeftButtonUp="ViewTestDataTree_MouseLeftButtonUp" MouseRightButtonUp="ViewTestDataTree_MouseRightButtonUp" Style="{StaticResource TreeLabelStyle}" Padding="2,2,2,2" Text="{Binding DisplayText}"/>
<Border Grid.Column="1" Style="{StaticResource BorderStylePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockPassCountStyleTestData}"/>
</Border>
<Border Grid.Column="2" Style="{StaticResource BorderStyleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockFailCountStyleTestData}"/>
</Border>
<Border Grid.Column="3" Style="{StaticResource BorderStyleModulePassCountTestData}">
<TextBlock Style="{StaticResource TextBlockModulePassCountStyleTestData}"/>
</Border>
<Border Grid.Column="4" Style="{StaticResource BorderStyleModuleFailCountTestData}">
<TextBlock Style="{StaticResource TextBlockModuleFailCountStyleTestData}"/>
</Border>
</Grid>
</HierarchicalDataTemplate>
<TreeView BorderThickness="0" Name="ViewTestDataTree" VirtualizingStackPanel.IsVirtualizing = "True"
VirtualizingStackPanel.VirtualizationMode = "Recycling" ItemsSource="{Binding Projects}" Grid.Row="1"
ItemTemplate="{StaticResource level1}" Background="{StaticResource ATAM_WindowBackground}" FocusVisualStyle="{x:Null}">
<TreeView.ItemContainerStyle>
<!-- Make the focus highlight rectangle, around the current tree item, barely visible -->
<Style TargetType="{x:Type TreeViewItem}">
<Style.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="#FF202020" />
<SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="#FF202020" />
</Style.Resources>
<Setter Property="IsExpanded" Value="{Binding IsExpanded}"/>
<EventSetter Event="TreeViewItem.Expanded" Handler="TreeViewItem_Expanded"/>
<EventSetter Event="TreeViewItem.Collapsed" Handler="TreeViewItem_Collapsed"/>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
在这里，我在 TreeView.ItemContainerStyle 中有一个设置器 Setter Property="IsExpanded" Value="{Binding IsExpanded}" 但是当我设置 TestStamentList 时，它是第 4 级从代码中将 IsExpanded 属性设置为 True，则该项目不会被扩展。我想在 Button Click(Find Next Button) 事件中展开具有某些特定条件的子项。
注意：-我在所有列表级别（4 个级别）上都有 IsExpanded 属性，并且我正在设置最后一级列表（TestModuleStatementList）的 IsExpanded=true。
下面是我的按钮点击事件：
private void FindNextFailButton_Click(object sender, RoutedEventArgs e)
{
foreach (var Project in Projects)
{
foreach (var Devices in Project.TestRuns)
{
foreach (var Category in Devices.TestModuleCategories)
{
foreach (var TestModule in Category.TestModules)
{
foreach (var statement in TestModule.TestModuleStatementList)
{
if(statement.ModuleFailed==1)
{
//TreeViewItem item = ViewTestDataTree.ItemContainerGenerator.ContainerFromItem(statement) as TreeViewItem;
//item.IsExpanded = true;
Project.IsExpanded = true;
Devices.IsExpanded = true;
Category.IsExpanded = true;
TestModule.IsExpanded = true;
statement.IsExpanded = true;
statement.IsSelected = true;
return;
//ViewTestDataTree.SelectedItem = statement;
}
}
}
}
}
}
}
}
请提供一些帮助
提前致谢。
【问题讨论】：
-
AFAIK 你也需要爬上树来扩展父母。否则不会出现。在最后一个元素中，您需要调用 BringIntoView()。我已经编写了一个行为，以保留 MVVM 并避免代码隐藏。该行为扩展父 trres 并调用 Bringintoview...
-
@Marco 感谢您的评论。正如我提到的，我想在单击按钮时展开一个特定的节点，我在这个树视图中有 4 个级别。现在，每当用户单击按钮时，我都想在第 4 级扩展节点。我曾在此使用过 setter，但它不起作用。你能提供一些工作代码吗？