Handle maximized windows before moving or resizing

Author: MichaelEllnebrand

HotkeyHandler.cs

@@ -146,6 +146,7 @@ private void StartMovingWindow()
         {
             isMovingWindow = true;
             isResizingWindow = false;
+            Window.HandleMaximizedWindow(currentWindowHandle);
             SetStartingOffsets();
         }
 
@@ -158,6 +159,7 @@ private void StartResizingWindow()
         {
             isMovingWindow = false;
             isResizingWindow = true;
+            Window.HandleMaximizedWindow(currentWindowHandle);
             SetStartingOffsets();
         }
 
@@ -176,7 +178,6 @@ private void SetStartingOffsets()
             resizeWindowsMouseOffset.X = mousePostion.X;
             resizeWindowsMouseOffset.Y = mousePostion.Y;
 
-
             resizeStartWidth = currentWindowRectangle.Width - currentWindowRectangle.X;
             resizeStartHeight = currentWindowRectangle.Height - currentWindowRectangle.Y;
 

Window.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Drawing;
 using System.Runtime.InteropServices;
 using System.Text;
@@ -8,14 +9,16 @@ namespace WindowTool
 {
     internal static class Window
     {
-        const short SWP_NOMOVE = 0X2;
-        const short SWP_NOSIZE = 1;
-        const short SWP_NOZORDER = 0X4;
+        const int SWP_NOSIZE = 0x0001;
+        const int SWP_NOMOVE = 0x0002;
+        const int SWP_NOZORDER = 0x0004;
         const int SWP_SHOWWINDOW = 0x0040;
+        
+        const int SW_RESTORE = 9;
 
-        private const int GA_PARENT = 1; // Retrieves the parent window.This does not include the owner, as it does with the GetParent function.
-        private const int GA_ROOT = 2; // Retrieves the root window by walking the chain of parent windows.
-        private const int GA_ROOTOWNER = 3; // Retrieves the owned root window by walking the chain of parent and owner windows returned by GetParent.
+        const int GA_PARENT = 1; // Retrieves the parent window.This does not include the owner, as it does with the GetParent function.
+        const int GA_ROOT = 2; // Retrieves the root window by walking the chain of parent windows.
+        const int GA_ROOTOWNER = 3; // Retrieves the owned root window by walking the chain of parent and owner windows returned by GetParent.
 
         [DllImport("user32.dll")]
         private static extern IntPtr WindowFromPoint(Point point);
@@ -32,12 +35,27 @@ internal static class Window
         [DllImport("user32.dll")]
         private static extern bool SetForegroundWindow(IntPtr hWnd);
 
+        [DllImport("user32.dll")]
+        static extern bool ShowWindow(IntPtr hWnd, int wFlags);
+
+        [DllImport("user32.dll")]
+        [return: MarshalAs(UnmanagedType.Bool)]
+        static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
+
+        private struct WINDOWPLACEMENT
+        {
+            public int length;
+            public int flags;
+            public int showCmd;
+            public Point ptMinPosition;
+            public Point ptMaxPosition;
+            public Rectangle rcNormalPosition;
+        }
 
         public static IntPtr GetWindow(Point point)
         {
             IntPtr intPtr = WindowFromPoint(point);
             intPtr = GetAncestor(intPtr, GA_ROOT);
-
             return intPtr;
         }
 
@@ -59,6 +77,17 @@ public static Rectangle GetWindowPosition(IntPtr hWnd)
             return rect;
         }
 
-
+        public static void HandleMaximizedWindow(IntPtr hWnd)
+        {
+            WINDOWPLACEMENT windowPlacement = new();
+            GetWindowPlacement(hWnd, ref windowPlacement);
+            if (windowPlacement.showCmd == 3)
+            {
+                Rectangle windowDimentions = GetWindowPosition(hWnd);
+                ShowWindow(hWnd, SW_RESTORE);
+                SetForegroundWindow(hWnd);
+                SetWindowPos(hWnd, 0, windowDimentions.Top, windowDimentions.Right, windowDimentions.Width, windowDimentions.Height, SWP_SHOWWINDOW);
+            }
+        }
     }
 }