回答編集履歴
2
見直しキャンペーン中
answer
CHANGED
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@@ -1,102 +1,102 @@
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horaihoraiさんのほうではすでに解決されていますが、第三者視点ではわかりにくいところもあるのでまとめさせていただきます。
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```xaml
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<UserControl
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x:Class="Questions348249.Left"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<StackPanel Name="Width">
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<Button Command="{Binding Command}" Content="Button" />
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<StackPanel Width="{Binding LeftWidth}">
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<Rectangle Height="30" Fill="Red" />
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</StackPanel>
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</StackPanel>
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</UserControl>
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```
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```xaml
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<UserControl
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x:Class="Questions348249.Right"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<StackPanel Name="Width">
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<Button Command="{Binding LeftRight.Command}" Content="Button" />
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<StackPanel Width="{Binding LeftRight.RightWidth}">
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<Rectangle Height="30" Fill="Blue" />
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</StackPanel>
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</StackPanel>
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</UserControl>
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```
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```xaml
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<Window
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x:Class="Questions348249.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:userControls="clr-namespace:Questions348249"
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Width="800"
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Height="450">
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<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
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<!-- こうしてもいいし -->
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<userControls:Left DataContext="{Binding LeftRight}" />
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<!-- こうするならRightで Width="{Binding LeftRight.RightWidth}" となる -->
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<userControls:Right />
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</StackPanel>
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</Window>
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```
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```
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using CommunityToolkit.Mvvm.ComponentModel;
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using CommunityToolkit.Mvvm.Input;
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using System.Windows;
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using System.Windows.Input;
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namespace Questions348249
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{
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class LeftRightViewModel : ObservableObject
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{
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public double LeftWidth { get => leftWidth; set => SetProperty(ref leftWidth, value); }
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private double leftWidth;
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public double RightWidth { get => rightWidth; set => SetProperty(ref rightWidth, value); }
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private double rightWidth;
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public ICommand Command { get; }
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public LeftRightViewModel()
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{
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Command = new RelayCommand(() =>
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{
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LeftWidth += 10;
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RightWidth += 5;
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});
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}
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}
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class MainViewModel
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{
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public LeftRightViewModel LeftRight { get; }
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= new LeftRightViewModel { LeftWidth = 100, RightWidth = 100, };
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}
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public partial class MainWindow : Window
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{
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public MainWindow()
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{
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InitializeComponent();
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// 「AllのDataContext（ViewModel）自体」 に設定した場合
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//DataContext = new LeftRightViewModel();
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// 「そのプロパティのひとつに設定」 した場合
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DataContext = new MainViewModel();
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}
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}
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}
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```
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97
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-
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98
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-
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99
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`INotifyPropertyChanged`・`ICommand`実装は↓を使用。
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100
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[NuGet Gallery | CommunityToolkit.Mvvm 7.0.3](https://www.nuget.org/packages/CommunityToolkit.Mvvm/)
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101
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-
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1
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+
horaihoraiさんのほうではすでに解決されていますが、第三者視点ではわかりにくいところもあるのでまとめさせていただきます。
|
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2
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+
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3
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+
```xml:Left.xaml
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4
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<UserControl
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x:Class="Questions348249.Left"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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7
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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8
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<StackPanel Name="Width">
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9
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<Button Command="{Binding Command}" Content="Button" />
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10
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<StackPanel Width="{Binding LeftWidth}">
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11
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<Rectangle Height="30" Fill="Red" />
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</StackPanel>
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</StackPanel>
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14
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</UserControl>
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15
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```
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17
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```xml:Right.xaml
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<UserControl
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x:Class="Questions348249.Right"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
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<StackPanel Name="Width">
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<Button Command="{Binding LeftRight.Command}" Content="Button" />
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<StackPanel Width="{Binding LeftRight.RightWidth}">
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25
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<Rectangle Height="30" Fill="Blue" />
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26
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</StackPanel>
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27
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</StackPanel>
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28
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</UserControl>
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```
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30
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+
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31
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```xml:MainWindow.xaml
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<Window
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x:Class="Questions348249.MainWindow"
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34
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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35
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+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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36
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xmlns:userControls="clr-namespace:Questions348249"
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37
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Width="800"
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38
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Height="450">
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39
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<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
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40
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+
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41
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<!-- こうしてもいいし -->
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42
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<userControls:Left DataContext="{Binding LeftRight}" />
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43
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+
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44
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<!-- こうするならRightで Width="{Binding LeftRight.RightWidth}" となる -->
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45
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<userControls:Right />
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46
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</StackPanel>
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47
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</Window>
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48
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```
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49
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+
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50
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+
```cs
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51
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+
using CommunityToolkit.Mvvm.ComponentModel;
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52
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+
using CommunityToolkit.Mvvm.Input;
|
|
53
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+
using System.Windows;
|
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54
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+
using System.Windows.Input;
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55
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+
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56
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namespace Questions348249
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57
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{
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58
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class LeftRightViewModel : ObservableObject
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{
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public double LeftWidth { get => leftWidth; set => SetProperty(ref leftWidth, value); }
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private double leftWidth;
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public double RightWidth { get => rightWidth; set => SetProperty(ref rightWidth, value); }
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private double rightWidth;
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public ICommand Command { get; }
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public LeftRightViewModel()
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{
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Command = new RelayCommand(() =>
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{
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LeftWidth += 10;
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RightWidth += 5;
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});
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73
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}
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74
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}
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+
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class MainViewModel
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{
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public LeftRightViewModel LeftRight { get; }
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= new LeftRightViewModel { LeftWidth = 100, RightWidth = 100, };
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}
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81
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+
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82
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public partial class MainWindow : Window
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83
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{
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84
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public MainWindow()
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85
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+
{
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86
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InitializeComponent();
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87
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+
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88
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// 「AllのDataContext（ViewModel）自体」 に設定した場合
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89
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+
//DataContext = new LeftRightViewModel();
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90
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+
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91
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// 「そのプロパティのひとつに設定」 した場合
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92
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DataContext = new MainViewModel();
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93
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}
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94
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}
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95
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}
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96
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+
```
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|
97
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+
|
|
98
|
+
|
|
99
|
+
`INotifyPropertyChanged`・`ICommand`実装は↓を使用。
|
|
100
|
+
[NuGet Gallery | CommunityToolkit.Mvvm 7.0.3](https://www.nuget.org/packages/CommunityToolkit.Mvvm/)
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101
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+
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102
102
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[Introduction to the MVVM Toolkit - Windows Community Toolkit | Microsoft Docs](https://docs.microsoft.com/ja-jp/windows/communitytoolkit/mvvm/introduction)
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1
余計なStackPanel
answer
CHANGED
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@@ -36,16 +36,13 @@
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36
36
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xmlns:userControls="clr-namespace:Questions348249"
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|
37
37
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Width="800"
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38
38
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Height="450">
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39
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-
<StackPanel>
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39
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+
<StackPanel HorizontalAlignment="Center" Orientation="Horizontal">
|
|
40
40
|
|
|
41
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+
<!-- こうしてもいいし -->
|
|
41
|
-
<
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42
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<userControls:Left DataContext="{Binding LeftRight}" />
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42
43
|
|
|
43
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-
<!-- こうしてもいいし -->
|
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44
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-
<userControls:Left DataContext="{Binding LeftRight}" />
|
|
45
|
-
|
|
46
|
-
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44
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+
<!-- こうするならRightで Width="{Binding LeftRight.RightWidth}" となる -->
|
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47
|
-
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45
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+
<userControls:Right />
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48
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-
</StackPanel>
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49
46
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</StackPanel>
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50
47
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</Window>
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51
48
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```
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