WPF：使用 WindowState 问题最大化窗口（应用程序将隐藏 Windows 任务栏）

Question

我已将主窗口状态设置为“最大化”，但问题是我的应用程序将填满整个屏幕，甚至任务栏。我究竟做错了什么 ？ 我正在使用分辨率为 1600 * 900 的 windows 2008 R2

这是 Xaml：

<Window x:Class="RadinFarazJamAutomationSystem.wndMain"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    xmlns:local="clr-namespace:RadinFarazJamAutomationSystem"
     xmlns:mwt="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
    Title="MyName"  FontFamily="Tahoma" FontSize="12" Name="mainWindow"  WindowState="Maximized"   xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    xmlns:my="clr-namespace:RadinFarazJamAutomationSystem.Calendare.UC" mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  Loaded="mainWindow_Loaded" FlowDirection="LeftToRight"
    ResizeMode="NoResize" Closed="mainWindow_Closed">

Answer 1

我已经根据thread 中的Mike Weinhardt 回答实施了考虑多个展示柜的解决方案。如果您想使用自己的按钮以编程方式最大化/最小化窗口，您可以使用它。

解决方案：

// To get a handle to the specified monitor
[DllImport("user32.dll")]
private static extern IntPtr MonitorFromWindow(IntPtr hwnd, int dwFlags);

// To get the working area of the specified monitor
[DllImport("user32.dll")]
private static extern bool GetMonitorInfo(HandleRef hmonitor, [In, Out] MonitorInfoEx monitorInfo);

private static MonitorInfoEx GetMonitorInfo(Window window, IntPtr monitorPtr) {
    var monitorInfo = new MonitorInfoEx();

    monitorInfo.cbSize = Marshal.SizeOf(monitorInfo);
    GetMonitorInfo(new HandleRef(window, monitorPtr), monitorInfo);

    return monitorInfo;
}

private static void Minimize(Window window) {
     if(window == null) {
         return;
     }

     window.WindowState = WindowState.Minimized;
 }

 private static void Restore(Window window) {
        if(window == null) {
            return;
        }

        window.WindowState = WindowState.Normal;
        window.ResizeMode = ResizeMode.CanResizeWithGrip;
    }

    private static void Maximize(Window window) {
        window.ResizeMode = ResizeMode.NoResize;

        // Get handle for nearest monitor to this window
        var wih = new WindowInteropHelper(window);

        // Nearest monitor to window
        const int MONITOR_DEFAULTTONEAREST = 2;
        var hMonitor = MonitorFromWindow(wih.Handle, MONITOR_DEFAULTTONEAREST);

        // Get monitor info
        var monitorInfo = GetMonitorInfo(window, hMonitor);

        // Create working area dimensions, converted to DPI-independent values
        var source = HwndSource.FromHwnd(wih.Handle);

        if(source?.CompositionTarget == null) {
            return;
        }

        var matrix = source.CompositionTarget.TransformFromDevice;
        var workingArea = monitorInfo.rcWork;

        var dpiIndependentSize =
            matrix.Transform(
                new Point(workingArea.Right - workingArea.Left,
                          workingArea.Bottom - workingArea.Top));



        // Maximize the window to the device-independent working area ie
        // the area without the taskbar.
        window.Top = workingArea.Top;
        window.Left = workingArea.Left;

        window.MaxWidth = dpiIndependentSize.X;
        window.MaxHeight = dpiIndependentSize.Y;

        window.WindowState = WindowState.Maximized;
    }

辅助结构：

// Rectangle (used by MONITORINFOEX)
[StructLayout(LayoutKind.Sequential)]
public struct Rect {
    public int Left;
    public int Top;
    public int Right;
    public int Bottom;
}

// Monitor information (used by GetMonitorInfo())
[StructLayout(LayoutKind.Sequential)]
public class MonitorInfoEx {
    public int cbSize;
    public Rect rcMonitor; // Total area
    public Rect rcWork; // Working area
    public int dwFlags;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 0x20)]
    public char[] szDevice;
}

附言隐藏默认按钮使用：

WindowStyle="None"

在 XAML 窗口中。

Answer 2

您可以在 xaml 代码中设置 MaxHeight 属性，如下所示：

 MaxHeight="{x:Static SystemParameters.MaximizedPrimaryScreenHeight}"

Answer 3

这个效果最好……

public MainWindow()
    {
        InitializeComponent();
        MaxHeight = SystemParameters.VirtualScreenHeight;
        MaxWidth = SystemParameters.VirtualScreenWidth;
    }

Answer 4

我想要相反的（WindowStyle=None），但反转此解决方案也适用于您的情况：

// prevent it from overlapping the taskbar

// "minimize" it
WindowStyle = WindowStyle.SingleBorderWindow;
// Maximize it again. This time it will respect the taskbar.
WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;
// app is now borderless fullscreen, showing the taskbar again

我为我的案子做了什么：

// make it always overlap the taskbar

// From windowed to maximized without border and window bar
WindowStyle = WindowStyle.None;
WindowState = WindowState.Maximized;
// Now the window does not overlap the taskbar
Hide();
Show();
// Now it does (because it's re-opened)

Answer 5

我稍微简化了Geoffrey's answer，这样您就不必 p/invoke 任何东西了。

    public MainWindow()
    {
        InitializeComponent();
        winMain.SourceInitialized += new EventHandler(win_SourceInitialized);
    }

    void win_SourceInitialized( object sender, System.EventArgs e )
    {
        var handle = (new WindowInteropHelper( _attachedElement )).Handle;
        var handleSource = HwndSource.FromHwnd( handle );
        if ( handleSource == null )
            return;
        handleSource.AddHook( WindowProc );
    }

    private static IntPtr WindowProc( IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled )
    {
        switch ( msg )
        {
            case 0x0024:/* WM_GETMINMAXINFO */
                WmGetMinMaxInfo( hwnd, lParam );
                handled = true;
                break;
        }

        return (IntPtr)0;
    }

    private static void WmGetMinMaxInfo( IntPtr hwnd, IntPtr lParam )
    {

        var mmi = (MINMAXINFO)Marshal.PtrToStructure( lParam, typeof( MINMAXINFO ) );

        // Adjust the maximized size and position to fit the work area of the correct monitor
        var currentScreen = System.Windows.Forms.Screen.FromHandle( hwnd );
        var workArea = currentScreen.WorkingArea;
        var monitorArea = currentScreen.Bounds;
        mmi.ptMaxPosition.x = Math.Abs( workArea.Left - monitorArea.Left );
        mmi.ptMaxPosition.y = Math.Abs( workArea.Top - monitorArea.Top );
        mmi.ptMaxSize.x = Math.Abs( workArea.Right - workArea.Left );
        mmi.ptMaxSize.y = Math.Abs( workArea.Bottom - workArea.Top );

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


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

[StructLayout( LayoutKind.Sequential )]
public struct POINT
{
    /// <summary>
    /// x coordinate of point.
    /// </summary>
    public int x;
    /// <summary>
    /// y coordinate of point.
    /// </summary>
    public int y;

    /// <summary>
    /// Construct a point of coordinates (x,y).
    /// </summary>
    public POINT( int x, int y )
    {
        this.x = x;
        this.y = y;
    }
}

Answer 6

继续我之前的评论。我在我的应用程序中使用以下代码（来源：Maximizing WPF windows

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

    public MainWindow()
    {
        InitializeComponent();
        winMain.SourceInitialized += new EventHandler(win_SourceInitialized);
    }


    #region Avoid hiding task bar upon maximalisation

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

        return (System.IntPtr)0;
    }

    void win_SourceInitialized(object sender, EventArgs e)
    {
        System.IntPtr handle = (new WinInterop.WindowInteropHelper(this)).Handle;
        WinInterop.HwndSource.FromHwnd(handle).AddHook(new WinInterop.HwndSourceHook(WindowProc));
    }

    private static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
    {

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

        // Adjust the maximized size and position to fit the work area of the correct monitor
        int MONITOR_DEFAULTTONEAREST = 0x00000002;
        System.IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);

        if (monitor != System.IntPtr.Zero)
        {

            MONITORINFO monitorInfo = new MONITORINFO();
            GetMonitorInfo(monitor, monitorInfo);
            RECT rcWorkArea = monitorInfo.rcWork;
            RECT rcMonitorArea = monitorInfo.rcMonitor;
            mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
            mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
            mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
            mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
        }

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

    [StructLayout(LayoutKind.Sequential)]
    public struct POINT
    {
        /// <summary>
        /// x coordinate of point.
        /// </summary>
        public int x;
        /// <summary>
        /// y coordinate of point.
        /// </summary>
        public int y;

        /// <summary>
        /// Construct a point of coordinates (x,y).
        /// </summary>
        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;
    };

    void win_Loaded(object sender, RoutedEventArgs e)
    {
        winMain.WindowState = WindowState.Maximized;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public class MONITORINFO
    {
        /// <summary>
        /// </summary>            
        public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));

        /// <summary>
        /// </summary>            
        public RECT rcMonitor = new RECT();

        /// <summary>
        /// </summary>            
        public RECT rcWork = new RECT();

        /// <summary>
        /// </summary>            
        public int dwFlags = 0;
    }

    [StructLayout(LayoutKind.Sequential, Pack = 0)]
    public struct RECT
    {
        /// <summary> Win32 </summary>
        public int left;
        /// <summary> Win32 </summary>
        public int top;
        /// <summary> Win32 </summary>
        public int right;
        /// <summary> Win32 </summary>
        public int bottom;

        /// <summary> Win32 </summary>
        public static readonly RECT Empty = new RECT();

        /// <summary> Win32 </summary>
        public int Width
        {
            get { return Math.Abs(right - left); }  // Abs needed for BIDI OS
        }
        /// <summary> Win32 </summary>
        public int Height
        {
            get { return bottom - top; }
        }

        /// <summary> Win32 </summary>
        public RECT(int left, int top, int right, int bottom)
        {
            this.left = left;
            this.top = top;
            this.right = right;
            this.bottom = bottom;
        }


        /// <summary> Win32 </summary>
        public RECT(RECT rcSrc)
        {
            this.left = rcSrc.left;
            this.top = rcSrc.top;
            this.right = rcSrc.right;
            this.bottom = rcSrc.bottom;
        }

        /// <summary> Win32 </summary>
        public bool IsEmpty
        {
            get
            {
                // BUGBUG : On Bidi OS (hebrew arabic) left > right
                return left >= right || top >= bottom;
            }
        }
        /// <summary> Return a user friendly representation of this struct </summary>
        public override string ToString()
        {
            if (this == RECT.Empty) { return "RECT {Empty}"; }
            return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
        }

        /// <summary> Determine if 2 RECT are equal (deep compare) </summary>
        public override bool Equals(object obj)
        {
            if (!(obj is Rect)) { return false; }
            return (this == (RECT)obj);
        }

        /// <summary>Return the HashCode for this struct (not garanteed to be unique)</summary>
        public override int GetHashCode()
        {
            return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
        }


        /// <summary> Determine if 2 RECT are equal (deep compare)</summary>
        public static bool operator ==(RECT rect1, RECT rect2)
        {
            return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
        }

        /// <summary> Determine if 2 RECT are different(deep compare)</summary>
        public static bool operator !=(RECT rect1, RECT rect2)
        {
            return !(rect1 == rect2);
        }


    }

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

    [DllImport("user32.dll")]
    static extern bool GetCursorPos(ref Point lpPoint);

    [DllImport("User32")]
    internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);

    #endregion

Answer 7

您可以使用构造函数将该窗口的MaxHeight 属性设置为SystemParameters.MaximizedPrimaryScreenHeight。

public MainWindow()
{
    InitializeComponent();
    this.MaxHeight = SystemParameters.MaximizedPrimaryScreenHeight;
}