[WPF] Parent Binding

DateTemplate 내부의 액션으로 부모단의 팝업 Property 를 변경하는 방법입니다.

ItemModel.cs

namespace Wpf.ParentBindingTest
{
    public class ItemModel
    {
        public string? Name { get; set; }
        public double Value { get; set; }
    }
}

MainViewModel.cs

using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.CompilerServices;

namespace Wpf.ParentBindingTest
{
    public class MainViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public void OnPropertyChanged([CallerMemberName] string name = "") => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));

        private bool isShowPopup = false;

        public bool IsShowPopup
        {
            get => this.isShowPopup;
            set
            {
                this.isShowPopup = value;
                OnPropertyChanged();
            }
        }

        private ObservableCollection<ItemModel> items;

        public ObservableCollection<ItemModel> Items
        {
            get => this.items;
            set
            {
                this.items = value;
                OnPropertyChanged();
            }
        }

        public MainViewModel()
        {
            items = new ObservableCollection<ItemModel>();
            items.Add(new ItemModel() { Name = nameof(Color.Blue), Value = Color.Blue.GetHue() });
            items.Add(new ItemModel() { Name = nameof(Color.Yellow), Value = Color.Yellow.GetHue() });
            //items.Add(new ItemModel() { Name = nameof(Color.Green), Value = Color.Green.GetHue() });
            //items.Add(new ItemModel() { Name = nameof(Color.Red), Value = Color.Red.GetHue() });
            //items.Add(new ItemModel() { Name = nameof(Color.Purple), Value = Color.Purple.GetHue() });
        }
    }
}

MainWindow.xaml
(Togglebutton 에서 부모를 찾아 IsShowPopup Property 를 Binding 합니다.)

<Window
    x:Class="Wpf.ParentBindingTest.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:Wpf.ParentBindingTest"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="800"
    Height="450"
    mc:Ignorable="d">

    <Window.Resources>
        <DataTemplate x:Key="testTemplate">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="100" />
                    <ColumnDefinition Width="100" />
                    <ColumnDefinition Width="100" />
                </Grid.ColumnDefinitions>
                <Label Grid.Column="0" Content="{Binding Name}" />
                <TextBlock Grid.Column="1" Text="{Binding Value}" />
                <ToggleButton
                    Grid.Column="2"
                    Content="Popup"
                    IsChecked="{Binding Path=DataContext.IsShowPopup, RelativeSource={RelativeSource AncestorType=Window}}" />
            </Grid>
        </DataTemplate>
    </Window.Resources>

    <Grid>
        <ListView ItemTemplate="{StaticResource testTemplate}" ItemsSource="{Binding Items}" SelectionMode="Single"/>
        <Popup
            Width="100"
            Height="80"
            IsOpen="{Binding IsShowPopup}"
            Placement="Center">
            <Grid Background="Blue">
                <Label
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Content="POPUP" />
            </Grid>
        </Popup>
    </Grid>
</Window>

MainWindow.xaml.cs

using System.Windows;

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

            this.DataContext = new MainViewModel();
        }
    }
}

결과

[Source]
https://github.com/kei-soft/KJunBlog/tree/master/Wpf.ParentBindingTest

GitHub - kei-soft/KJunBlog