From 394c22a587822e6e90ea0c75bd3bbfc9dfcd70bd Mon Sep 17 00:00:00 2001
From: Ricardo <leeburning@outlook.com>
Date: Mon, 27 Dec 2021 16:50:58 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=9E=E7=8E=B0=E5=8F=8C=E5=B1=8F=E5=A4=8D?=
 =?UTF-8?q?=E5=88=B6?=
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---
 Loaf/MainWindow.xaml.cs |  4 ++-
 Loaf/ScreenHelper.cs    | 64 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 Loaf/ScreenHelper.cs

diff --git a/Loaf/MainWindow.xaml.cs b/Loaf/MainWindow.xaml.cs
index 4b81f1b..872f43b 100644
--- a/Loaf/MainWindow.xaml.cs
+++ b/Loaf/MainWindow.xaml.cs
@@ -80,8 +80,9 @@ public void Loaf()
             }
             Frame.Navigate(typeof(Windows11UpdateView));
 
+
             _appWindow.SetPresenter(AppWindowPresenterKind.FullScreen);
-           
+            ScreenHelper.SetScreenMode(1);
             while (ShowCursor(true) < 0)
             {
                 ShowCursor(true); //显示光标
@@ -99,6 +100,7 @@ public void Unloaf()
         {
             _isLoafing = false;
             _appWindow.SetPresenter(AppWindowPresenterKind.Default);
+            ScreenHelper.SetScreenMode(2);
             var parent = VisualTreeHelper.GetParent(Root);
             while (parent != null)
             {
diff --git a/Loaf/ScreenHelper.cs b/Loaf/ScreenHelper.cs
new file mode 100644
index 0000000..67f7054
--- /dev/null
+++ b/Loaf/ScreenHelper.cs
@@ -0,0 +1,64 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Loaf
+{
+    public static class ScreenHelper
+    {
+        private const uint SDC_APPLY = 0x00000080;
+
+        private const uint SDC_TOPOLOGY_INTERNAL = 0x00000001;
+
+        private const uint SDC_TOPOLOGY_CLONE = 0x00000002;
+
+        /// <summary>
+        /// 扩展模式
+        /// </summary>
+        private const uint SDC_TOPOLOGY_EXTEND = 0x00000004;
+
+        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+        private static extern long SetDisplayConfig(uint numPathArrayElements, IntPtr pathArray, uint numModeArrayElements,
+                                                    IntPtr modeArray, uint flags);
+        /// <summary>
+        /// 设置屏幕的显示模式
+        /// </summary>
+        /// <param name="displayModel"></param>
+        /// <returns></returns>
+        private static bool SetScreen(uint displayModel)
+        {
+            return SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, SDC_APPLY | displayModel) == 0;
+        }
+
+        /// <summary>
+        /// 设置屏幕的显示模式
+        /// </summary>
+        /// <param name="type">模式(0 - 主屏  1 - 双屏复制  2 - 双屏扩展</param>
+        /// <returns></returns>
+        public static bool SetScreenMode(int type)
+        {
+            uint smode;
+
+            switch (type)
+            {
+                case 0:
+                    smode = SDC_APPLY | SDC_TOPOLOGY_INTERNAL;
+                    break;
+                case 1:
+                    smode = SDC_APPLY | SDC_TOPOLOGY_CLONE;
+                    break;
+                case 2:
+                    smode = SDC_APPLY | SDC_TOPOLOGY_EXTEND;
+                    break;
+                default:
+                    smode = SDC_APPLY | SDC_TOPOLOGY_INTERNAL;
+                    break;
+            }
+
+            return SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, smode) == 0;
+        }
+    }
+}