CentralizedControl/HandyControl/HandyControl_Shared/Controls/Attach/WindowAttach.cs

using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Input;
using System.Windows.Interop;
using HandyControl.Data;
using HandyControl.Tools.Interop;

namespace HandyControl.Controls;

public static class WindowAttach
{
    public static readonly DependencyProperty IsDragElementProperty = DependencyProperty.RegisterAttached(
        "IsDragElement", typeof(bool), typeof(WindowAttach), new PropertyMetadata(ValueBoxes.FalseBox, OnIsDragElementChanged));

    public static void SetIsDragElement(DependencyObject element, bool value)
        => element.SetValue(IsDragElementProperty, ValueBoxes.BooleanBox(value));

    public static bool GetIsDragElement(DependencyObject element)
        => (bool) element.GetValue(IsDragElementProperty);

    private static void OnIsDragElementChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is UIElement ctl)
        {
            if ((bool) e.NewValue)
            {
                ctl.MouseLeftButtonDown += DragElement_MouseLeftButtonDown;
            }
            else
            {
                ctl.MouseLeftButtonDown -= DragElement_MouseLeftButtonDown;
            }
        }
    }

    private static void DragElement_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        if (sender is DependencyObject obj && e.ButtonState == MouseButtonState.Pressed)
        {
            System.Windows.Window.GetWindow(obj)?.DragMove();
        }
    }

    public static readonly DependencyProperty IgnoreAltF4Property = DependencyProperty.RegisterAttached(
        "IgnoreAltF4", typeof(bool), typeof(WindowAttach), new PropertyMetadata(ValueBoxes.FalseBox, OnIgnoreAltF4Changed));

    private static void OnIgnoreAltF4Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is System.Windows.Window window)
        {
            if ((bool) e.NewValue)
            {
                window.PreviewKeyDown += Window_PreviewKeyDown;
            }
            else
            {
                window.PreviewKeyDown -= Window_PreviewKeyDown;
            }
        }
    }

    private static void Window_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.System && e.SystemKey == Key.F4)
        {
            e.Handled = true;
        }
    }

    public static void SetIgnoreAltF4(DependencyObject element, bool value)
        => element.SetValue(IgnoreAltF4Property, ValueBoxes.BooleanBox(value));

    public static bool GetIgnoreAltF4(DependencyObject element)
        => (bool) element.GetValue(IgnoreAltF4Property);

    public static readonly DependencyProperty ShowInTaskManagerProperty = DependencyProperty.RegisterAttached(
        "ShowInTaskManager", typeof(bool), typeof(WindowAttach), new PropertyMetadata(ValueBoxes.TrueBox, OnShowInTaskManagerChanged));

    private static void OnShowInTaskManagerChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is System.Windows.Window window)
        {
            var v = (bool) e.NewValue;
            window.SetCurrentValue(System.Windows.Window.ShowInTaskbarProperty, v);

            if (v)
            {
                window.SourceInitialized -= Window_SourceInitialized;
            }
            else
            {
                window.SourceInitialized += Window_SourceInitialized;
            }
        }
    }

    private static void Window_SourceInitialized(object sender, EventArgs e)
    {
        if (sender is System.Windows.Window window)
        {
            var _ = new WindowInteropHelper(window)
            {
                Owner = InteropMethods.GetDesktopWindow()
            };
        }
    }

    public static void SetShowInTaskManager(DependencyObject element, bool value)
        => element.SetValue(ShowInTaskManagerProperty, ValueBoxes.BooleanBox(value));

    public static bool GetShowInTaskManager(DependencyObject element)
        => (bool) element.GetValue(ShowInTaskManagerProperty);

    public static readonly DependencyProperty HideWhenClosingProperty = DependencyProperty.RegisterAttached(
        "HideWhenClosing", typeof(bool), typeof(WindowAttach), new PropertyMetadata(ValueBoxes.FalseBox, OnHideWhenClosingChanged));

    private static void OnHideWhenClosingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is System.Windows.Window window)
        {
            var v = (bool) e.NewValue;
            if (v)
            {
                window.Closing += Window_Closing;
            }
            else
            {
                window.Closing -= Window_Closing;
            }
        }
    }

    private static void Window_Closing(object sender, CancelEventArgs e)
    {
        if (sender is System.Windows.Window window)
        {
            window.Hide();
            e.Cancel = true;
        }
    }

    public static void SetHideWhenClosing(DependencyObject element, bool value)
        => element.SetValue(HideWhenClosingProperty, ValueBoxes.BooleanBox(value));

    public static bool GetHideWhenClosing(DependencyObject element)
        => (bool) element.GetValue(HideWhenClosingProperty);

    public static readonly DependencyProperty ExtendContentToNonClientAreaProperty = DependencyProperty.RegisterAttached(
        "ExtendContentToNonClientArea", typeof(bool), typeof(WindowAttach), new PropertyMetadata(ValueBoxes.FalseBox));

    public static void SetExtendContentToNonClientArea(DependencyObject element, bool value)
        => element.SetValue(ExtendContentToNonClientAreaProperty, ValueBoxes.BooleanBox(value));

    public static bool GetExtendContentToNonClientArea(DependencyObject element)
        => (bool) element.GetValue(ExtendContentToNonClientAreaProperty);
}