BASE 1.1

Native/Win32Interop.cs

@@ -10,6 +10,23 @@ internal static class Win32Interop
     [DllImport("dwmapi.dll", PreserveSig = true)]
     private static extern int DwmSetWindowAttribute(nint hwnd, int attribute, ref int value, int size);
 
+    private const int GwlStyle = -16;
+    private const nint WsBorder = 0x00800000;
+    private const nint WsDlgFrame = 0x00400000;
+    private const uint SwpNoMove = 0x0002;
+    private const uint SwpNoSize = 0x0001;
+    private const uint SwpNoZOrder = 0x0004;
+    private const uint SwpFrameChanged = 0x0020;
+
+    [DllImport("user32.dll", EntryPoint = "GetWindowLongPtrW", SetLastError = true)]
+    private static extern nint GetWindowLongPtr(nint hwnd, int index);
+
+    [DllImport("user32.dll", EntryPoint = "SetWindowLongPtrW", SetLastError = true)]
+    private static extern nint SetWindowLongPtr(nint hwnd, int index, nint value);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern bool SetWindowPos(nint hwnd, nint insertAfter, int x, int y, int width, int height, uint flags);
+
     public static void ApplyDarkTitleBar(nint hwnd, bool enabled)
     {
         if (hwnd == 0) return;
@@ -17,4 +34,14 @@ internal static class Win32Interop
         var result = DwmSetWindowAttribute(hwnd, DwmwaUseImmersiveDarkMode, ref value, sizeof(int));
         if (result != 0) DwmSetWindowAttribute(hwnd, DwmwaUseImmersiveDarkModeLegacy, ref value, sizeof(int));
     }
+
+    public static void RemovePopupFrame(nint hwnd)
+    {
+        if (hwnd == 0) return;
+        var style = GetWindowLongPtr(hwnd, GwlStyle);
+        var withoutFrame = style & ~WsBorder & ~WsDlgFrame;
+        if (style == withoutFrame) return;
+        SetWindowLongPtr(hwnd, GwlStyle, withoutFrame);
+        SetWindowPos(hwnd, 0, 0, 0, 0, 0, SwpNoMove | SwpNoSize | SwpNoZOrder | SwpFrameChanged);
+    }
 }