WPF应用程序强制横屏的解决方案_c# 强制横屏-优快云博客

本文链接：https://blog.youkuaiyun.com/qq996980215/article/details/125802607

该博客介绍了一种在Android应用中检测并自动调整屏幕方向的方法。通过使用NativeMethods类，获取设备的屏幕方向，并根据方向改变UI元素的角度。在App启动时和屏幕方向改变时，都会触发角度的更新，确保UI始终与屏幕方向匹配。同时，使用MVVM模式将角度绑定到视图模型，实现界面动态旋转。

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一定是无边框App才可以做到；

首先是获取屏幕当前显示方向工具类：

 public class NativeMethods
    {
        public const int ENUM_CURRENT_SETTINGS = -1;
        public enum DisplayOrientation { Default = 0, Landscape = 0, Portrait, Landscape_Flipped, Portrait_Flipped }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public struct DEVMODE
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string dmDeviceName;

            public short dmSpecVersion;
            public short dmDriverVersion;
            public short dmSize;
            public short dmDriverExtra;
            public int dmFields;
            public int dmPositionX;
            public int dmPositionY;
            public int dmDisplayOrientation;
            public int dmDisplayFixedOutput;
            public short dmColor;
            public short dmDuplex;
            public short dmYResolution;
            public short dmTTOption;
            public short dmCollate;

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string dmFormName;

            public short dmLogPixels;
            public short dmBitsPerPel;
            public int dmPelsWidth;
            public int dmPelsHeight;
            public int dmDisplayFlags;
            public int dmDisplayFrequency;
            public int dmICMMethod;
            public int dmICMIntent;
            public int dmMediaType;
            public int dmDitherType;
            public int dmReserved1;
            public int dmReserved2;
            public int dmPanningWidth;
            public int dmPanningHeight;
        };

        public static DisplayOrientation getDisaplayState()
        {
            // initialize the DEVMODE structure
            DEVMODE dm = new DEVMODE();
            dm.dmDeviceName = new String(new char[32]);
            dm.dmFormName = new String(new char[32]);
            dm.dmSize = (short)Marshal.SizeOf(dm);

            if (0 != NativeMethods.EnumDisplaySettings(null, NativeMethods.ENUM_CURRENT_SETTINGS, ref dm))
            {
                // swap width and height
                int temp = dm.dmPelsHeight;
                dm.dmPelsHeight = dm.dmPelsWidth;
                dm.dmPelsWidth = temp;
                switch (dm.dmDisplayOrientation)
                {
                    case 0: return DisplayOrientation.Landscape;
                    case 1: return DisplayOrientation.Portrait;
                    case 2: return DisplayOrientation.Landscape_Flipped;
                    case 3: return DisplayOrientation.Portrait_Flipped;
                    default: return DisplayOrientation.Default;
                }
            }
            return DisplayOrientation.Default;
        }
        
        [DllImport("user32.dll", CharSet = CharSet.Ansi)]
        public static extern int EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);
        
        [DllImport("user32.dll")]
        public static extern int ChangeDisplaySettings(ref DEVMODE lpDevMode, int dwFlags);

        [DllImport("user32.dll", EntryPoint = "#2507")]//此函数没有函数名，只能通过入口序号调用
        public extern static bool SetAutoRotation(bool bEnable);//设置自动旋转状态

    }

App启动时，判断一次当前屏幕方向，并进行更改

 switch (NativeMethods.getDisaplayState())
 {
         case NativeMethods.DisplayOrientation.Landscape: _mainViewModel.Angle = 0; break;
         case NativeMethods.DisplayOrientation.Portrait: _mainViewModel.Angle = 90; break;
         case NativeMethods.DisplayOrientation.Landscape_Flipped: _mainViewModel.Angle = 180; break;
         case NativeMethods.DisplayOrientation.Portrait_Flipped: _mainViewModel.Angle = 270; break;
 }

主容器添加LayoutTransform布局，并使用MVVM绑定到相关成员变量

  <ContentControl.LayoutTransform>
              <RotateTransform Angle="{Binding Angle}"></RotateTransform>
  </ContentControl.LayoutTransform>

添加更改显示设置时事件

 Microsoft.Win32.SystemEvents.DisplaySettingsChanging += (o, e) =>
{
         switch (NativeMethods.getDisaplayState())
         {
                case NativeMethods.DisplayOrientation.Landscape: _mainViewModel.Angle = 0; break;
                case NativeMethods.DisplayOrientation.Portrait: _mainViewModel.Angle = 90; break;
                case NativeMethods.DisplayOrientation.Landscape_Flipped: _mainViewModel.Angle = 180; break;
                case NativeMethods.DisplayOrientation.Portrait_Flipped: _mainViewModel.Angle = 270; break;
         }
};