在树状视图中滚动

Question

我在tabitem中有一个treeview。 我想在树视图周围添加一个滚动条。 我已经如下修改了我的xaml-在树视图周围添加了一个滚动视图，但是滚动条从不出现

                        <TabControl  Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" BorderThickness="0" Background="White">
                            <TabItem Header="TAB" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
                                <TabItem.Resources>
                                    <HierarchicalDataTemplate x:Key="NameTemplate" 
                                       ItemsSource="{Binding Path=ChildrenList}">
                                        <StackPanel Orientation="Horizontal" Margin="2">
                                            <TextBlock Text="{Binding Path=Name}" FontWeight="Bold" >
                                            </TextBlock>
                                        </StackPanel>
                                    </HierarchicalDataTemplate>
                                </TabItem.Resources>
                                <ScrollViewer Name="scroll1" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" >
                                    <TreeView Name="SymbolsTreeView" BorderThickness="0" Height="{Binding ElementName=scroll1, Path=ActualHeight}">
                                    <TreeViewItem Header="Symbols" IsExpanded="True" ItemsSource="{Binding ParentList}" ItemTemplate="{StaticResource NameTemplate}">
                                    </TreeViewItem>
                                </TreeView>
                                </ScrollViewer>
                            </TabItem>
                        </TabControl>

有人知道吗？

Answer 1

您已将VerticalScrollBarVisibility和HorizontalScrollBarVisibility定义为Auto 。 意味着滚动条仅在需要时才可见。 如果希望始终可见，则将它们设置为Visible 。

检查此样本。 我已经修改了您的代码。

XAML：

<Window x:Class="Demo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TabControl  Grid.Row="0" BorderThickness="0" Background="White">
            <TabItem Header="TAB">
                <TabItem.Resources>
                    <HierarchicalDataTemplate x:Key="NameTemplate" 
                                       ItemsSource="{Binding Path=ChildrenList}">
                        <StackPanel Orientation="Horizontal" Margin="2">
                            <TextBlock Text="{Binding Path=Name}" FontWeight="Bold" >
                            </TextBlock>
                        </StackPanel>
                    </HierarchicalDataTemplate>
                </TabItem.Resources>
                <ScrollViewer Name="scroll1" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
                    <TreeView Name="SymbolsTreeView" BorderThickness="0" >
                        <TreeViewItem Header="Symbols" IsExpanded="True" Name="TV"  ItemTemplate="{StaticResource NameTemplate}">
                        </TreeViewItem>
                    </TreeView>
                </ScrollViewer>
            </TabItem>
        </TabControl>
    </Grid>
</Window>

背后的代码：

using System;
using System.Collections.Generic;
using System.Windows;

namespace Demo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            List<DemoData> list = new List<DemoData>();
            for(int i = 0; i < 50; i++)
            {
                var data = new DemoData () {Name = "Data_HorzontallyLongData-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Almost--------------------------------Done." + i};
                data.ChildrenList = new List<DemoData>();
                for(int j = 0; j < 15; j++)
                {
                    data.ChildrenList.Add(new DemoData() { Name = "Children_"+ i +"_"+ j});
                }
                list.Add(data);
            }
            TV.ItemsSource = list;
        }
    }

    public class DemoData
    {
        public List<DemoData> ChildrenList { get; set; }

        public String Name { get; set; }

    }
}