disallow child windows in fullscreen

Author: tomysshadow

FlashpointSecurePlayer/Shared.cs

@@ -244,10 +244,6 @@ public enum GW : uint {
         [DllImport("USER32.DLL", SetLastError = true)]
         public static extern IntPtr GetWindow(IntPtr hWnd, GW uCmd);
 
-        [DllImport("USER32.DLL")]
-        [return: MarshalAs(UnmanagedType.Bool)]
-        public static extern bool IsChild(IntPtr hWndParent, IntPtr hWnd);
-
         [DllImport("USER32.DLL", SetLastError = true)]
         public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
 

FlashpointSecurePlayer/WebBrowserMode.cs

@@ -105,6 +105,11 @@ public bool Fullscreen {
                     return;
                 }
 
+
+                if (GetWindow(Handle, GW.GW_CHILD) != IntPtr.Zero) {
+                    value = false;
+                }
+
                 if (fullscreen == value) {
                     return;
                 }
@@ -555,6 +560,12 @@ private void WebBrowserMode_Deactivate(object sender, EventArgs e) {
             Application.RemoveMessageFilter(messageFilter);
 
             if (Fullscreen) {
+                // disallow child windows in fullscreen
+                if (GetWindow(Handle, GW.GW_CHILD) != IntPtr.Zero) {
+                    Fullscreen = false;
+                    return;
+                }
+
                 IntPtr foregroundWindow = GetForegroundWindow();
 
                 // we are the active window, because we are only now deactivating
@@ -590,12 +601,6 @@ private void WebBrowserMode_Deactivate(object sender, EventArgs e) {
                         }
                         return;
                     }
-
-                    if (IsChild(Handle, foregroundWindow)) {
-                        // the new window is a child of this window
-                        Fullscreen = false;
-                        return;
-                    }
                 }
 
                 WindowState = FormWindowState.Minimized;