回答編集履歴
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サンプル追加
test
CHANGED
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@@ -22,7 +22,7 @@
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ViewModelで`UserControl`自体を保持してしまうと、テストしづらくMVVMのメリットがありません（というかViewとViewModelが分離できておらずMVVMになっていません）
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VBできないのでこれと言ってサンプル提示もできませんが^^;
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~~VBできないのでこれと言ってサンプル提示もできませんが^^;~~
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---
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@@ -33,3 +33,238 @@
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ぐちゃぐちゃマージン（`Margin="80,185,0,225"`のような）があると、ウィンドウリサイズ等で盛大に崩れます。
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`Grid`や`DockPanel`等を使ってちゃんとレイアウトしましょう。
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---
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ざっとサンプル作りました（C#からの機械翻訳なので変なところがあるかもしれません）
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が、遷移コマンドを子ViewModel内に用意するのは、ちょっと気持ち悪い気がします^^;
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個人的には`NavigationRail`（`TabControl`）や`DrawerHost`等を使って、こういった遷移にならないようにするほうが好みです^^
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```xml:MainWindow.xaml
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<Window
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x:Class="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:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:local="clr-namespace:Qoa07su5ulvykbq"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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Title="MainWindow"
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Width="800"
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Height="450"
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mc:Ignorable="d">
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<Window.Resources>
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<DataTemplate DataType="{x:Type local:UserControl1ViewModel}">
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<local:UserControl1 />
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</DataTemplate>
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<DataTemplate DataType="{x:Type local:UserControl2ViewModel}">
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<local:UserControl2 />
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</DataTemplate>
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</Window.Resources>
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<Grid>
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<ContentControl Content="{Binding CurrentView}" />
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</Grid>
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</Window>
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```
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```xml:UserControl1.xaml
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<UserControl
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x:Class="UserControl1"
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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:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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d:DesignHeight="450"
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d:DesignWidth="800"
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Background="White"
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mc:Ignorable="d">
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<DockPanel>
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<Grid DockPanel.Dock="Top">
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<TextBlock
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Background="#7F673AB7"
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FontSize="24"
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Foreground="White"
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Text="UserControl1" />
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<Button
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Margin="8,4"
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HorizontalAlignment="Right"
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Command="{Binding SettingButtonCommand}"
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Content="設定" />
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<!-- こうやればコマンドをもらわずに済むがこれはこれで気持ち悪い^^; -->
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<!--<Button
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Margin="8,4"
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HorizontalAlignment="Right"
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Command="{Binding DataContext.GoToUserControl2Command, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}"
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Content="設定" />-->
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</Grid>
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<Grid Margin="80,20,80,40">
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<Grid.RowDefinitions>
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<RowDefinition Height="Auto" />
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<RowDefinition />
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</Grid.RowDefinitions>
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<DockPanel TextBlock.FontSize="24">
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<Label VerticalAlignment="Center" Content="ロット番号" />
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<TextBox
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MinWidth="310"
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MinHeight="64"
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HorizontalAlignment="Left"
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Style="{DynamicResource MaterialDesignOutlinedTextBox}"
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Text="{Binding LotNumber, UpdateSourceTrigger=PropertyChanged}" />
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</DockPanel>
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<DockPanel Grid.Row="1" Margin="0,60,0,0">
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<Label
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Content="メッセージ"
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DockPanel.Dock="Top"
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FontSize="24" />
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<TextBlock
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Background="#19000000"
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FontSize="48"
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Style="{StaticResource MaterialDesignHeadline1TextBlock}" />
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</DockPanel>
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</Grid>
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</DockPanel>
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</UserControl>
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```
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```xml:UserControl2.xaml
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<UserControl
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x:Class="UserControl2"
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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:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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d:DesignHeight="450"
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d:DesignWidth="800"
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Background="White"
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mc:Ignorable="d">
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<DockPanel>
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<Grid DockPanel.Dock="Top">
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<TextBlock
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Background="#7F673AB7"
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FontSize="24"
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Foreground="White"
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Text="UserControl2" />
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<Button
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Margin="8,4"
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HorizontalAlignment="Right"
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Command="{Binding BackButtonCommand}"
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Content="戻る" />
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</Grid>
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<TextBox
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Margin="80,20,80,40"
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VerticalAlignment="Top"
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FontSize="24"
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Style="{DynamicResource MaterialDesignOutlinedTextBox}"
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Text="{Binding Text, UpdateSourceTrigger=PropertyChanged}" />
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</DockPanel>
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</UserControl>
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```
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```vb
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Imports System.ComponentModel.DataAnnotations
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Imports CommunityToolkit.Mvvm.ComponentModel
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Imports CommunityToolkit.Mvvm.Input
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Public Class MainWindowViewModel
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Inherits ObservableObject
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Public Property CurrentView As Object
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Get
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Return _currentView
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End Get
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Set(ByVal value As Object)
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SetProperty(_currentView, value)
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End Set
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End Property
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Private _currentView As Object
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Public ReadOnly Property GoToUserControl1Command As ICommand
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Public ReadOnly Property GoToUserControl2Command As ICommand
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Private userControl2ViewModel As UserControl2ViewModel
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Public Sub New()
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GoToUserControl1Command = New RelayCommand(AddressOf BackButton_Click)
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GoToUserControl2Command = New RelayCommand(AddressOf SettingButton_Click)
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'遷移させるのはこっちなのでコマンドを差し込み（ちょっと気持ち悪いか？^^;
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CurrentView = New UserControl1ViewModel(GoToUserControl2Command)
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userControl2ViewModel = New UserControl2ViewModel(GoToUserControl1Command)
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End Sub
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Private Sub SettingButton_Click()
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'インスタンス使いまわし（なのでTextの状態が残る）
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CurrentView = userControl2ViewModel
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End Sub
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Private Sub BackButton_Click()
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'インスタンス都度生成（なのでLotNumberの状態は残らない）
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CurrentView = New UserControl1ViewModel(GoToUserControl2Command)
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End Sub
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End Class
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Public Class UserControl1ViewModel
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Inherits ObservableValidator
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<MaxLength(16, ErrorMessage:="最大１６文字までです。")>
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<RegularExpression("[a-zA-Z0-9]+", ErrorMessage:="半角英数字のみ入力できます。")>
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Public Property LotNumber As String
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Get
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Return _lotNumber
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End Get
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Set(ByVal value As String)
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SetProperty(_lotNumber, value, True)
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End Set
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End Property
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Private _lotNumber As String
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Public Property Message As String
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Get
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Return _message
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End Get
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Set(ByVal value As String)
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SetProperty(_message, value)
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End Set
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End Property
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Private _message As String
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Public ReadOnly Property SettingButtonCommand As ICommand
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Public Sub New(ByVal settingButtonCommand As ICommand)
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Me.SettingButtonCommand = settingButtonCommand
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End Sub
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End Class
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Public Class UserControl2ViewModel
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Inherits ObservableObject
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Public Property Text As String
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Get
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Return _text
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End Get
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Set(ByVal value As String)
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SetProperty(_text, value, True)
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End Set
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End Property
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Private _text As String
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Public ReadOnly Property BackButtonCommand As ICommand
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Public Sub New(ByVal backButtonCommand As ICommand)
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Me.BackButtonCommand = backButtonCommand
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End Sub
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End Class
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Partial Public Class MainWindow
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Inherits Window
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Public Sub New()
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InitializeComponent()
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DataContext = New MainWindowViewModel()
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End Sub
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End Class
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```
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[NuGet Gallery | CommunityToolkit.Mvvm 8.2.1](https://www.nuget.org/packages/CommunityToolkit.Mvvm/8.2.1)
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268
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[NuGet Gallery | MaterialDesignThemes 4.9.0](https://www.nuget.org/packages/MaterialDesignThemes/4.9.0)
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