将几个 ToggleButton IsEnabled 属性绑定到其他 ToggleButtons

Question

我有一个包含 16 个 ToggleButtons 的页面，其中 12 个默认情况下处于禁用状态，并且只有在单击其余 4 个 ToggleButtons 中的任何一个后才会启用。有没有办法将 12 个禁用按钮的 IsEnabled 属性连接到 IsChecked 属性 4 个启用的按钮？

我之前使用几个 foreach 循环设法做到了这一点（并且目前正在尝试再次这样做），但我想必须有一种更优雅的方法来检查 IsChecked == true 是否不会循环通过子元素他们的父网格。不幸的是，原始项目在重新格式化期间丢失了，并且不存在项目文件的备份，因此必须从头开始重写代码。

Answer 1

从一个空白的 win8 商店应用模板开始。

在解决方案资源管理器中找到 MainPage，将 MainPage XAML 完全替换为：

<Page
x:Class="StackOverflowMultiButton.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:StackOverflowMultiButton"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
    <StackPanel Orientation="Horizontal">
    <StackPanel>
            <ToggleButton x:Name="ToggleButton1" IsChecked="{Binding tbt1_isChecked, Mode=TwoWay}"/>
            <ToggleButton x:Name="ToggleButton2" IsChecked="{Binding tbt2_isChecked, Mode=TwoWay}"/>
            <ToggleButton x:Name="ToggleButton3" IsChecked="{Binding tbt3_isChecked, Mode=TwoWay}"/>
            <ToggleButton x:Name="ToggleButton4" IsChecked="{Binding tbt4_isChecked, Mode=TwoWay}"/>
    </StackPanel>
    <StackPanel>
            <ToggleButton x:Name="ToggleButton5" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton6" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton7" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton8" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton9" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton10" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton11" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton12" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton13" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton14" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton15" IsEnabled="{Binding CommonIsEnabled}"/>
            <ToggleButton x:Name="ToggleButton16" IsEnabled="{Binding CommonIsEnabled}"/>
    </StackPanel>

    </StackPanel>
</Grid>

然后是后面的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace StackOverflowMultiButton
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
            this.DataContext = new MainPage_ViewModel();
        } 

    /// <summary>
    /// Invoked when this page is about to be displayed in a Frame.
    /// </summary>
    /// <param name="e">Event data that describes how this page was reached.  The Parameter
    /// property is typically used to configure the page.</param>
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
    }
}

public class MainPage_ViewModel : INotifyPropertyChanged
{

    public event PropertyChangedEventHandler PropertyChanged;

    private void OnPropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    bool _tbt1_isChecked = false;
    public bool tbt1_isChecked 
    {
        get {

            return this._tbt1_isChecked;
        }
        set {

            if (this._tbt1_isChecked == value)
                return;

            this._tbt1_isChecked = value;
            OnPropertyChanged("tbt1_isChecked");
            OnPropertyChanged("CommonIsEnabled");
        }
    }

    bool _tbt2_isChecked = false;
    public bool tbt2_isChecked
    {
        get
        {

            return this._tbt2_isChecked;
        }
        set
        {

            if (this._tbt2_isChecked == value)
                return;

            this._tbt2_isChecked = value;
            OnPropertyChanged("tbt2_isChecked");
            OnPropertyChanged("CommonIsEnabled");
        }
    }

    bool _tbt3_isChecked = false;
    public bool tbt3_isChecked
    {
        get
        {

            return this._tbt3_isChecked;
        }
        set
        {

            if (this._tbt3_isChecked == value)
                return;

            this._tbt3_isChecked = value;
            OnPropertyChanged("tbt3_isChecked");
            OnPropertyChanged("CommonIsEnabled");
        }
    }

    bool _tbt4_isChecked = false;
    public bool tbt4_isChecked
    {
        get
        {

            return this._tbt4_isChecked;
        }
        set
        {

            if (this._tbt4_isChecked == value)
                return;

            this._tbt4_isChecked = value;
            OnPropertyChanged("tbt4_isChecked");
            OnPropertyChanged("CommonIsEnabled");
        }
    }



    public bool CommonIsEnabled
    {
        get
        {

            return this._tbt1_isChecked ||
                this._tbt2_isChecked ||
                this._tbt3_isChecked ||
                this._tbt4_isChecked;
            }
        }

    }
}

运行应用程序，看看它是否满足您的需求。

Answer 2

捕捉前四个按钮的点击事件。让他们调用保存事件处理程序。

在事件句柄中编写代码：

bool enabled = tb1.IsChecked && tb2.IsChecked && tb3.IsChecked && tb4.IsChecked;
tb5.Enabled = tb6.Enabled = ... = tb16.Enabled = enabled;