使用WindowStyle = None正确最大化WPF窗口

Question

使用WindowStyle = None选项时,WPF窗口有两个问题.

1. 最大化时窗口覆盖任务栏.
2. 一旦最大化,窗口就不能被拖动到unmaximize.

如何纠正这些问题？最好不要使用Windows.Forms.

Answer 1

在线还有其他问题的答案.但是,他们都没有考虑解决方案如何在具有多个监视器的设置上执行.特别是如果主监视器不是设置中最左侧的监视器.

我设计此代码时考虑了单个和多个监视器设置.

此解决方案也没有引入Windows.Forms作为参考,它使用非管理调用.

XAML

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Background="AliceBlue" WindowStyle="None" Height="350" Width="525" SourceInitialized="Window_SourceInitialized">
    <Grid>
        <Rectangle Name="rctHeader" Height="40" VerticalAlignment="Top" Fill="CadetBlue" PreviewMouseLeftButtonDown="rctHeader_PreviewMouseLeftButtonDown" PreviewMouseLeftButtonUp="rctHeader_PreviewMouseLeftButtonUp" PreviewMouseMove="rctHeader_PreviewMouseMove"/>
    </Grid>
</Window>

代码背后

using System.Runtime.InteropServices;
using System.Windows.Interop;

private bool mRestoreIfMove = false;


public MainWindow()
{
    InitializeComponent();
}


void Window_SourceInitialized(object sender, EventArgs e)
{
    IntPtr mWindowHandle = (new WindowInteropHelper(this)).Handle;
    HwndSource.FromHwnd(mWindowHandle).AddHook(new HwndSourceHook(WindowProc));
}


private static System.IntPtr WindowProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
   switch (msg)
     {
        case 0x0024:
        WmGetMinMaxInfo(hwnd, lParam);
        break;
     }

        return IntPtr.Zero;
 }


private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
{
     POINT lMousePosition;
     GetCursorPos(out lMousePosition);

     IntPtr lPrimaryScreen = MonitorFromPoint(new POINT(0, 0), MonitorOptions.MONITOR_DEFAULTTOPRIMARY);
     MONITORINFO lPrimaryScreenInfo = new MONITORINFO();
     if (GetMonitorInfo(lPrimaryScreen, lPrimaryScreenInfo) == false)
     {
        return;
     }

     IntPtr lCurrentScreen = MonitorFromPoint(lMousePosition, MonitorOptions.MONITOR_DEFAULTTONEAREST);

     MINMAXINFO lMmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));

     if (lPrimaryScreen.Equals(lCurrentScreen) == true)
     {
            lMmi.ptMaxPosition.X = lPrimaryScreenInfo.rcWork.Left;
            lMmi.ptMaxPosition.Y = lPrimaryScreenInfo.rcWork.Top;
            lMmi.ptMaxSize.X = lPrimaryScreenInfo.rcWork.Right - lPrimaryScreenInfo.rcWork.Left;
            lMmi.ptMaxSize.Y = lPrimaryScreenInfo.rcWork.Bottom - lPrimaryScreenInfo.rcWork.Top;
     }
     else
     {
            lMmi.ptMaxPosition.X = lPrimaryScreenInfo.rcMonitor.Left;
            lMmi.ptMaxPosition.Y = lPrimaryScreenInfo.rcMonitor.Top;
            lMmi.ptMaxSize.X = lPrimaryScreenInfo.rcMonitor.Right - lPrimaryScreenInfo.rcMonitor.Left;
            lMmi.ptMaxSize.Y = lPrimaryScreenInfo.rcMonitor.Bottom - lPrimaryScreenInfo.rcMonitor.Top;
     }

     Marshal.StructureToPtr(lMmi, lParam, true);
}


private void SwitchWindowState()
{
   switch (WindowState)
   {
      case WindowState.Normal:
           {
              WindowState = WindowState.Maximized;
              break;
           }
      case WindowState.Maximized:
           {
              WindowState = WindowState.Normal;
              break;
           }
    }
}


private void rctHeader_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount == 2)
    {
       if ((ResizeMode == ResizeMode.CanResize) || (ResizeMode == ResizeMode.CanResizeWithGrip))
        {
           SwitchWindowState();
        }

         return;
     }

     else if (WindowState == WindowState.Maximized)
     {
        mRestoreIfMove = true;
        return;
     }

     DragMove();
}


private void rctHeader_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
    mRestoreIfMove = false;
}


private void rctHeader_PreviewMouseMove(object sender, MouseEventArgs e)
{
   if (mRestoreIfMove)
   {
            mRestoreIfMove = false;

            double percentHorizontal = e.GetPosition(this).X / ActualWidth;
            double targetHorizontal = RestoreBounds.Width * percentHorizontal;

            double percentVertical = e.GetPosition(this).Y / ActualHeight;
            double targetVertical = RestoreBounds.Height * percentVertical;

            WindowState = WindowState.Normal;

            POINT lMousePosition;
            GetCursorPos(out lMousePosition);

            Left = lMousePosition.X - targetHorizontal;
            Top = lMousePosition.Y - targetVertical;

            DragMove();
    }
}

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool GetCursorPos(out POINT lpPoint);


[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr MonitorFromPoint(POINT pt, MonitorOptions dwFlags);

enum MonitorOptions : uint
{
        MONITOR_DEFAULTTONULL = 0x00000000,
        MONITOR_DEFAULTTOPRIMARY = 0x00000001,
        MONITOR_DEFAULTTONEAREST = 0x00000002
}


[DllImport("user32.dll")]
static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);


[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
        public int X;
        public int Y;

        public POINT(int x, int y)
        {
            this.X = x;
            this.Y = y;
        }
}


[StructLayout(LayoutKind.Sequential)]
public struct MINMAXINFO
{
        public POINT ptReserved;
        public POINT ptMaxSize;
        public POINT ptMaxPosition;
        public POINT ptMinTrackSize;
        public POINT ptMaxTrackSize;
};


[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class MONITORINFO
{
        public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
        public RECT rcMonitor = new RECT();
        public RECT rcWork = new RECT();
        public int dwFlags = 0;
}


[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
        public int Left, Top, Right, Bottom;

        public RECT(int left, int top, int right, int bottom)
        {
            this.Left = left;
            this.Top = top;
            this.Right = right;
            this.Bottom = bottom;
        }
}

Answer 2

我有一个快速而又肮脏的解决方案.最大化无边框窗口时,请尝试以下代码:

if (WindowState == WindowState.Normal)
{
      WindowStyle = WindowStyle.SingleBorderWindow;
      WindowState = WindowState.Maximized;
      WindowStyle = WindowStyle.None;
}

诀窍是设置WindowStyle为SingleBorderWindow然后最大化窗口并将其设置回None.

Answer 3

这么好的代码 leebickmtu！

我在 Windows 10 中遇到了多个显示器的小问题：由于每个屏幕上都有一个任务栏，如果您在辅助屏幕上最大化您的窗口，他的任务栏将被隐藏。

我只是稍微修改一下这个方法，以便从任何屏幕获得相对位置：

private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
    {
        POINT lMousePosition;
        GetCursorPos(out lMousePosition);

        IntPtr lCurrentScreen = MonitorFromPoint(lMousePosition, MonitorOptions.MONITOR_DEFAULTTONEAREST);


        MINMAXINFO lMmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));

        MONITORINFO lCurrentScreenInfo = new MONITORINFO();
        if (GetMonitorInfo(lCurrentScreen, lCurrentScreenInfo) == false)
        {
            return;
        }

        //Position relative pour notre fenêtre
        lMmi.ptMaxPosition.X = lCurrentScreenInfo.rcWork.Left - lCurrentScreenInfo.rcMonitor.Left;
        lMmi.ptMaxPosition.Y = lCurrentScreenInfo.rcWork.Top - lCurrentScreenInfo.rcMonitor.Top;
        lMmi.ptMaxSize.X = lCurrentScreenInfo.rcWork.Right - lCurrentScreenInfo.rcWork.Left;
        lMmi.ptMaxSize.Y = lCurrentScreenInfo.rcWork.Bottom - lCurrentScreenInfo.rcWork.Top;

        Marshal.StructureToPtr(lMmi, lParam, true);
    }

希望这有助于...