WPF桌面端开发2-ItemsControl和ListBox获取点击行的索引

码客说

发布于 2020-05-09 14:57:28

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发布于 2020-05-09 14:57:28

文章被收录于专栏：码客码客

前言

ItemsControl和ListBox都可以用做列表，既然是列表，那么我们怎样获取列表点击的项呢。

ListBox点击列表项后就不能再触发点击事件，而ItemsControl压根就没有选中项，那么怎样处理呢？

ListBox

自定义ListBox,当item选中后再重置为未选中

自定义ListBox

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace ZJClassTool.Views
{
    public class MyListBox : ListBox
    {
        protected override DependencyObject GetContainerForItemOverride()
        {
            return new MyListBoxItem();
        }

    }
    public class MyListBoxItem : ListBoxItem
    {
        protected override void OnSelected(System.Windows.RoutedEventArgs e)
        {
            DependencyObject dep = (DependencyObject)e.OriginalSource;
            while ((dep != null) && !(dep is ListBoxItem))
            {
                dep = VisualTreeHelper.GetParent(dep);
            }

            if (dep == null) { return; }


            ListBoxItem item = (ListBoxItem)dep;
            if (item.IsSelected)
            {
                item.IsSelected = !item.IsSelected;
            }
            base.OnSelected(e);
        }
    }
}

使用

<views:MyListBox 
    x:Name="toolbar_list"
    ItemsSource="{Binding menuList}"
    ItemTemplate="{StaticResource ToolbarMenu}"
    SelectionChanged="myListBox_SelectionChanged"
    ScrollViewer.VerticalScrollBarVisibility="Disabled"
    ScrollViewer.HorizontalScrollBarVisibility="Disabled"
    Grid.Row="1" Background="#f3f3f3" BorderThickness="0">
</views:MyListBox>

对应的

private void myListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    object o = toolbar_list.SelectedItem;
    if (o == null)
    	return;
    MessageBox.Show(o.ToString());
}

ItemsControl

Item中添加Button,对Button添加事件，获取Button所在Item的Index

工具类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;

namespace ZJClassTool.Utils
{
    class VTHelper
    {
        public static T FindChild<T>(DependencyObject parent, string childName)
   where T : DependencyObject
        {
            if (parent == null) return null;

            T foundChild = null;

            int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < childrenCount; i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                // 如果子控件不是需查找的控件类型
                T childType = child as T;
                if (childType == null)
                {
                    // 在下一级控件中递归查找
                    foundChild = FindChild<T>(child, childName);

                    // 找到控件就可以中断递归操作 
                    if (foundChild != null) break;
                }
                else if (!string.IsNullOrEmpty(childName))
                {
                    var frameworkElement = child as FrameworkElement;
                    // 如果控件名称符合参数条件
                    if (frameworkElement != null && frameworkElement.Name == childName)
                    {
                        foundChild = (T)child;
                        break;
                    }
                }
                else
                {
                    // 查找到了控件
                    foundChild = (T)child;
                    break;
                }
            }

            return foundChild;
        }

        public static List<T> FindChilds<T>(DependencyObject parent, string childName)
   where T : DependencyObject
        {
            var list = new List<T>();
            if (parent == null) return list;

            int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < childrenCount; i++)
            {
                var child = VisualTreeHelper.GetChild(parent, i);
                // 如果子控件不是需查找的控件类型
                T childType = child as T;
                if (childType == null)
                {
                    // 在下一级控件中递归查找
                    var findChildList = FindChilds<T>(child, childName);
                    for (int j = 0; j < findChildList.Count; j++)
                    {

                    }
                    list.AddRange(FindChilds<T>(child, childName));

                }
                else if (!string.IsNullOrEmpty(childName))
                {
                    var frameworkElement = child as FrameworkElement;
                    // 如果控件名称符合参数条件
                    if (frameworkElement != null && frameworkElement.Name == childName)
                    {
                        list.Add((T)child);
                    }
                }
                else
                {
                    // 查找到了控件
                    list.Add((T)child);
                }
            }

            return list;
        }

        /// <summary>
        /// 查找父元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <param name="name"></param>
        /// <returns></returns>
        public static T FindParent<T>(DependencyObject i_dp) where T : DependencyObject
        {
            DependencyObject dobj = VisualTreeHelper.GetParent(i_dp);
            if (dobj != null)
            {
                if (dobj is T)
                {
                    return (T)dobj;
                }
                else
                {
                    dobj = FindParent<T>(dobj);
                    if (dobj != null && dobj is T)
                    {
                        return (T)dobj;
                    }
                }
            }
            return null;
        }
    }
}

xaml

<Window.Resources>
    <DataTemplate x:Key="ToolbarMenu">
        <Button x:Name="toolbar_item"  Background="Transparent" BorderThickness="0" Cursor="Hand" Height="60" Click="toolbar_item_Click">
            <Button.Content>
                <StackPanel Width="Auto" Background="Transparent">
                    <Image HorizontalAlignment="Center" Width="44" Source="{Binding Pic}"/>
                    <TextBlock HorizontalAlignment="Center" Text="{Binding Name}" Foreground="#3C525B"/>
                </StackPanel>
            </Button.Content>
        </Button>
    </DataTemplate>
</Window.Resources>
<ItemsControl 
    x:Name="toolbar_list"
    ItemsSource="{Binding menuList}"
    ItemTemplate="{StaticResource ToolbarMenu}"
    ScrollViewer.VerticalScrollBarVisibility="Disabled"
    ScrollViewer.HorizontalScrollBarVisibility="Disabled"
    Grid.Row="1" Background="#f3f3f3" BorderThickness="0">
</ItemsControl>

代码

private void toolbar_item_Click(object sender, RoutedEventArgs e)
{
    var clickindex = 0;
    var buttons = VTHelper.FindChilds<Button>(toolbar_list, "toolbar_item");
    for (var i = 0; i < buttons.Count; i++)
    {
        if (buttons[i] == sender)
        {
            clickindex = i;
            break;
        }
    }
}

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原始发表：2019-12-29，如有侵权请联系 cloudcommunity@tencent.com 删除

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