如何在列表框中删除折叠的空间与项目类型wrappanel，完整的源代码+图片包括

本文关键字：wrappanel 源代码 包括 类型 列表 删除 空间 折叠 项目 | 更新日期: 2023-09-27 18:09:36

我有一个ListBox的ItemsPanelTemplate的WrapPanel。还有一些剩下的&折叠元素的右填充，我想去掉它…当元素可见时，图像是一个漂亮的正方形，每行有五个按钮。这是一张图片:http://iterationx.posterous.com/71739342

当我的A-E按钮折叠时，我如何摆脱在第一个按钮开始的填充?

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" SizeToContent="WidthAndHeight"
        >
        <Grid Margin="100,100,100,100">
        <StackPanel>
            <ListBox Name="MainButtonListBox" HorizontalContentAlignment="Stretch" BorderThickness="0" ScrollViewer.HorizontalScrollBarVisibility="Disabled" Padding="0" Width="550">
                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate >
                        <WrapPanel />
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                <ListBox.ItemTemplate >
                    <DataTemplate>
                        <Button  Content="{Binding Path=ButtonName}"  Click="Button_Click" DataContext="{Binding}" Width="100"  Height="75"   Visibility="{Binding Path=Visibility}" />
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </StackPanel>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication2
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public class ButtonObj
        {
            public string ButtonName { get; set; }
            public Visibility Visibility { get; set; }
        }
        List<ButtonObj> AEList = new List<ButtonObj>();
        List<ButtonObj> MainButtonList = new List<ButtonObj>();
        public MainWindow()
        {
            InitializeComponent();
            AEList.Add(new ButtonObj() { ButtonName = "A", Visibility = Visibility.Collapsed });
            AEList.Add(new ButtonObj() { ButtonName = "B", Visibility = Visibility.Collapsed });
            AEList.Add(new ButtonObj() { ButtonName = "C", Visibility = Visibility.Collapsed });
            AEList.Add(new ButtonObj() { ButtonName = "D", Visibility = Visibility.Collapsed });
            AEList.Add(new ButtonObj() { ButtonName = "E", Visibility = Visibility.Collapsed });
            foreach (ButtonObj b1 in AEList) MainButtonList.Add(b1);
            MainButtonList.Add(new ButtonObj() { ButtonName = "Expand A-E", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "G", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "H", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "I", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "Collapse A-E", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "K", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "L", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "M", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "N", Visibility = Visibility.Visible });
            MainButtonList.Add(new ButtonObj() { ButtonName = "O", Visibility = Visibility.Visible });
            MainButtonListBox.ItemsSource = MainButtonList;
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Button btn = sender as Button;
            ButtonObj obj = btn.DataContext as ButtonObj;
            if (obj.ButtonName == "Expand A-E")
            {
                foreach (ButtonObj b1 in AEList) b1.Visibility = System.Windows.Visibility.Visible; 
            }
            if (obj.ButtonName == "Collapse A-E")
            {
                foreach (ButtonObj b1 in AEList) b1.Visibility = System.Windows.Visibility.Collapsed; 
            }
            MainButtonListBox.ItemsSource = null;
            MainButtonListBox.ItemsSource = MainButtonList;
        }
    }
}

如何在列表框中删除折叠的空间与项目类型wrappanel，完整的源代码+图片包括

您只需折叠列表框项的内容。你必须给ListBoxItem设置样式(它没有被删除)。

<ListBox Name="MainButtonListBox" HorizontalContentAlignment="Stretch" BorderThickness="0" ScrollViewer.HorizontalScrollBarVisibility="Disabled" Padding="0" Width="550" >
     <ListBox.ItemContainerStyle>
          <Style TargetType="{x:Type ListBoxItem}">
              <Setter Property="Padding" Value="0,0,0,0"/>
          </Style>
     </ListBox.ItemContainerStyle>
     <ListBox.ItemsPanel>
          <ItemsPanelTemplate >
               <WrapPanel />
           </ItemsPanelTemplate>
     ...

一般来说，最好使用过滤器的可能性，这样项目是真正从列表框中删除，而不仅仅是隐藏的内容(项目仍然是可选择的键盘)

你还可以(比第一种样式更好)折叠整个条目:

<ListBox.ItemContainerStyle>
    <Style TargetType="{x:Type ListBoxItem}">                        
        <Setter Property="Visibility" Value="{Binding Path=Visibility}"/>
    </Style>
</ListBox.ItemContainerStyle>
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