回答編集履歴
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Behavior版を追記しました。
answer
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@@ -2,6 +2,11 @@
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下記のサンプルコードは[こちら](https://teratail.com/questions/32055)の回答を WPF 向けに書き換えたものです。
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(ベヘイビア版を追記しました。)
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---
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(コードビハインド版)
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- MainWindow.xaml
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```XAML
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<Window x:Class="WpfApp1.MainWindow"
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@@ -77,4 +82,126 @@
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}
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}
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```
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---
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(Behavior版を追記)
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- MainWindow.xaml
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```XAML
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<Window x:Class="WpfApp1.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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
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xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
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xmlns:local="clr-namespace:WpfApp1"
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mc:Ignorable="d"
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Title="MainWindow"
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Height="450"
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Width="800">
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<i:Interaction.Behaviors>
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<local:MaximizedWindowBehavior MaximizedBounds="200,500,1920,1080" />
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</i:Interaction.Behaviors>
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<Grid>
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</Grid>
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</Window>
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```
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- MainWindow.xaml.cs
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既定のまま変更なし
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- MaximizedWindowBehavior.cs
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```C#
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using System;
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using System.ComponentModel;
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using System.Runtime.InteropServices;
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using System.Windows;
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using System.Windows.Interactivity;
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using System.Windows.Interop;
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namespace WpfApp1 {
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class MaximizedWindowBehavior: Behavior<Window> {
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#region MaximizedBounds Property
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public Rect MaximizedBounds {
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get => (Rect)this.GetValue( MaximizedBoundsProperty );
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set => this.SetValue( MaximizedBoundsProperty, value );
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}
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public static readonly DependencyProperty MaximizedBoundsProperty =
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DependencyProperty.Register( nameof( MaximizedBounds ), typeof( Rect ), typeof( MaximizedWindowBehavior ), new PropertyMetadata( Rect.Empty ) );
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#endregion
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public MaximizedWindowBehavior() { }
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protected override void OnAttached() {
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base.OnAttached();
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this.AssociatedObject.Loaded += this.WindowLoaded;
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this.AssociatedObject.Closing += this.WindowClosing;
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}
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protected override void OnDetaching() {
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this.AssociatedObject.Loaded -= this.WindowLoaded;
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this.AssociatedObject.Closing -= this.WindowClosing;
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base.OnDetaching();
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}
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private void WindowLoaded( object sender, RoutedEventArgs e ) {
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var hwnd = new WindowInteropHelper( this.AssociatedObject ).Handle;
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var source = HwndSource.FromHwnd( hwnd );
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source.AddHook( this.WndProc );
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}
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private void WindowClosing( object sender, CancelEventArgs e ) {
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var hwnd = new WindowInteropHelper( this.AssociatedObject ).Handle;
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var source = HwndSource.FromHwnd( hwnd );
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source.RemoveHook( this.WndProc );
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}
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#region Win32
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private struct POINT {
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public int x;
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public int y;
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}
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#pragma warning disable CS0649
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private struct MINMAXINFO {
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public POINT ptReserved;
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public POINT ptMaxSize; // 最大化フォームのサイズ
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public POINT ptMaxPosition; // 最大化フォームの位置
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public POINT ptMinTrackSize; // フォームの最大サイズ
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public POINT ptMaxTrackSize; // フォームの最小サイズ
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}
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#pragma warning restore CS0649
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private const int WM_GETMINMAXINFO = 0x0024;
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#endregion
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private IntPtr WndProc( IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled ) {
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if( msg == WM_GETMINMAXINFO ) {
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handled = true;
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var info = Marshal.PtrToStructure<MINMAXINFO>( lParam );
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info.ptMaxPosition.x = (int)this.MaximizedBounds.Left;
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info.ptMaxPosition.y = (int)this.MaximizedBounds.Top;
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if( 0 < this.MaximizedBounds.Width )
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info.ptMaxSize.x = (int)this.MaximizedBounds.Width;
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if( 0 < this.MaximizedBounds.Height )
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info.ptMaxSize.y = (int)this.MaximizedBounds.Height;
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Marshal.StructureToPtr( info, lParam, true );
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return IntPtr.Zero;
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}
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return IntPtr.Zero;
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}
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}
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}
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```
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