Comment implémenter le redimensionnement des fenêtres de tous les côtés en utilisant un adorner?

Question

J'ai une fenêtre wpf transparente sans bordure (WindowStyle = None) que j'aimerais pouvoir redimensionner de tous les côtés. Actuellement, le redimensionnement ne fonctionne qu'avec les paramètres ci-dessus si je définis ResizeMode = CanResizeWithGrip. C'est sympa pour le repère visuel, mais pas très sympa car on ne peut que redimensionner à partir d'un coin.

Je voudrais faire ceci avec un adorner, ainsi je peux également donner un repère visuel quand la fenêtre est dans le mode de redimensionnement (qui peut être allumé et éteint). Est-ce possible? Si oui, comment pourrais-je m'y prendre?

Answer 1

Cette question a déjà été répondue quelque part sur stackoverflow. Je ne peux pas vraiment le trouver maintenant, mais voici comment je l'ai fait.

MainWindow:

<Window x:Class="Solution.Views.Main.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="MainWindow" MinWidth="1000" MinHeight="500" WindowStyle="None" AllowsTransparency="False" BorderThickness="0" ResizeMode="NoResize"> 

    <Window.TaskbarItemInfo> 
    <TaskbarItemInfo /> 
    </Window.TaskbarItemInfo> 

    <Grid> 

    <Border MouseLeftButtonDown="WindowResizeEast" MouseEnter="BorderVertical_OnMouseEnter" MouseLeave="BorderAll_OnMouseLeave" VerticalAlignment="Stretch" HorizontalAlignment="Right" Width="1" Background="Black"/> 
    <Border MouseLeftButtonDown="WindowResizeWest" MouseEnter="BorderVertical_OnMouseEnter" MouseLeave="BorderAll_OnMouseLeave" VerticalAlignment="Stretch" HorizontalAlignment="Left" Width="1" Background="Black"/> 
    <Border MouseLeftButtonDown="WindowResizeNorth" MouseEnter="BorderHorizontal_OnMouseEnter" MouseLeave="BorderAll_OnMouseLeave" VerticalAlignment="Top" HorizontalAlignment="Stretch" Height="1" Background="Black"/> 
    <Border MouseLeftButtonDown="WindowResizeSouth" MouseEnter="BorderHorizontal_OnMouseEnter" MouseLeave="BorderAll_OnMouseLeave" VerticalAlignment="Bottom" HorizontalAlignment="Stretch" Height="1" Background="Black"/> 
    <Border VerticalAlignment="Bottom" HorizontalAlignment="Right" Width="20" Height="20" MouseEnter="BorderSouthEast_OnMouseEnter" MouseLeave="BorderAll_OnMouseLeave" MouseLeftButtonDown="UIElement_OnMouseLeftButtonDown"> 
     <Grid> 
      <Path Stroke="Gray" StrokeThickness="1" Data=" M 5 20 L 20 5 M 10 20 L 20 10 M 15 20 L 20 15"/> 
     </Grid> 
    </Border> 
    </Grid> 
</Window> 

Code MainWindow:

using System; 
using System.Diagnostics; 
using System.Linq; 
using System.Runtime.InteropServices; 
using System.Windows; 
using System.Windows.Input; 
using System.Windows.Interop; 
using System.Windows.Media; 
using PrmWpf.Services; 

public partial class MainWindow 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
    } 

    [DllImport("user32.dll", CharSet = CharSet.Auto)] 
    private static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam); 

    [DllImportAttribute("user32.dll")] 
    public static extern bool ReleaseCapture(); 

    private void WindowResizeNorth(object sender, MouseButtonEventArgs e) //PreviewMousLeftButtonDown 
    { 
     var hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource; 
     SendMessage(hwndSource.Handle, 0x112, (IntPtr)ResizeDirection.Top, IntPtr.Zero); 
    } 

    private void WindowResizeSouth(object sender, MouseButtonEventArgs e) //PreviewMousLeftButtonDown 
    { 
     var hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource; 
     SendMessage(hwndSource.Handle, 0x112, (IntPtr)ResizeDirection.Bottom, IntPtr.Zero); 
    } 

    private void WindowResizeWest(object sender, MouseButtonEventArgs e) //PreviewMousLeftButtonDown 
    { 
     var hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource; 
     SendMessage(hwndSource.Handle, 0x112, (IntPtr)ResizeDirection.Left, IntPtr.Zero); 
    } 

    private void WindowResizeEast(object sender, MouseButtonEventArgs e) //PreviewMousLeftButtonDown 
    { 
     var hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource; 
     SendMessage(hwndSource.Handle, 0x112, (IntPtr)ResizeDirection.Right, IntPtr.Zero); 
    } 

    private enum ResizeDirection { Left = 61441, Right = 61442, Top = 61443, Bottom = 61446, BottomRight = 61448, } 

    private void BorderVertical_OnMouseEnter(object sender, MouseEventArgs e) 
    { 
     Mouse.OverrideCursor = Cursors.SizeWE; 
    } 

    private void BorderHorizontal_OnMouseEnter(object sender, MouseEventArgs e) 
    { 
     Mouse.OverrideCursor = Cursors.SizeNS; 
    } 

    private void BorderAll_OnMouseLeave(object sender, MouseEventArgs e) 
    { 
     Mouse.OverrideCursor = Cursors.Arrow; 
    } 

    private void BorderSouthEast_OnMouseEnter(object sender, MouseEventArgs e) 
    { 
     Mouse.OverrideCursor = Cursors.SizeNWSE; 
    } 

    private void UIElement_OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e) 
    { 
     var hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource; 
     SendMessage(hwndSource.Handle, 0x112, (IntPtr)ResizeDirection.BottomRight, IntPtr.Zero); 
    } 
}