如何在点击内容后隐藏展开？ XAML

Question

需要一些帮助，有谁知道如何做到当您单击“展开”的内容时 - 它会隐藏吗？

        <Expander Header="First Expand">
            <ListBox>
                <ListBox.Items>
                    <CheckBox Content="First"/>
                    <CheckBox Content="Second"/>                                    
                    <CheckBox Content="Third"/>
                </ListBox.Items>
            </ListBox>
        </Expander>

是否可以使用绑定？

Answer 1

这是我使用绑定编写的示例。如果您 "check" 第三个复选框，扩展器将关闭。请注意，如果您取消选中扩展器，它不会关闭（这只是我的设计，您的需求可能会有所不同）。

        <Expander x:Name="firstExpand" Header="First Expand" IsExpanded="{Binding IsExpanded}">
            <ListBox>
                <ListBox.Items>
                    <CheckBox x:Name="firstCheckbox" Content="First" IsChecked="{Binding FirstChecked}"/>
                    <CheckBox x:Name="secondCheckbox" Content="Second"  IsChecked="{Binding SecondChecked}"/>
                    <CheckBox x:Name="thirdCheckbox" Content="Third"  IsChecked="{Binding ThirdChecked}"/>
                </ListBox.Items>
            </ListBox>
        </Expander>

    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private bool firstChecked;
        private bool secondChecked;
        private bool thirdChecked;
        private bool isExpanded;

        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;
            this.PropertyChanged += MainWindow_PropertyChanged;
            this.IsExpanded = true;
        }

        private void MainWindow_PropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            // If the third item was checked...close the expansion
            if (e.PropertyName == nameof(ThirdChecked) && ThirdChecked)
            {
                this.IsExpanded = false;
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        public bool FirstChecked { get => this.firstChecked; set { this.firstChecked = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(FirstChecked))); } }
        public bool SecondChecked { get => this.secondChecked; set { this.secondChecked = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(SecondChecked))); } }
        public bool ThirdChecked { get => this.thirdChecked; set { this.thirdChecked = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(ThirdChecked))); } }
        public bool IsExpanded { get => this.isExpanded; set { this.isExpanded = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsExpanded))); } }
    }

Answer 2

我使用 ToggleButton，并重写模板（类似于 Expander，但 Name = Header）

   <ToggleButton Style="{DynamicResource NewToggle}" 
                 Name="First Toggle" Click="Toggle_click">
        <ListBox>
            <ListBox.Items>
                <CheckBox Content="First"/>
                <CheckBox Content="Second"/>                                    
                <CheckBox Content="Third"/>
            </ListBox.Items>
        </ListBox>
    </ToggleButton>

然后使用代码隐藏：

private void Toggle_click(object sender, RoutedEventArgs e)
{
    if (e.OriginalSource.GetType().Name == "CheckBox") 
    { 
        var myCheck= (CheckBox)e.OriginalSource;
        var MyList = (ListBox)myCheck.Parent;
        var myToogle = (ToggleButton)MyList.Parent;
        myToogle.IsChecked = false;
    }
    return;
}

我认为这不是一个好主意

如何在点击内容后隐藏展开？ XAML

How to hidden Expand after clicking on the content? XAML

wpf

xaml

expand