Add native Mac bridge code for window level settings

ScreenPlayWindow/src/MacBridge.mm

@@ -0,0 +1,30 @@
+#include "macbridge.h"
+#import <Cocoa/Cocoa.h>
+#import <objc/runtime.h>
+#include <QApplication>
+#include <QWindow>
+
+MacBridge * MacBridge::bridge = NULL;
+
+MacBridge::MacBridge()
+{
+
+}
+
+MacBridge * MacBridge::instance()
+{
+    if(!bridge)
+        bridge = new MacBridge;
+    return bridge;
+}
+
+void MacBridge::SetBackgroundLevel(QWindow* window)
+{
+    NSView* view = (NSView *) window->winId();
+    NSWindow* nsWindow = (NSWindow*)[view window];
+
+    [nsWindow setLevel:CGWindowLevelForKey(kCGDesktopWindowLevelKey) + 1];
+    [nsWindow setBackgroundColor: [NSColor blackColor]];
+    [nsWindow setAcceptsMouseMovedEvents: false];
+    [nsWindow setMovableByWindowBackground: false];
+}

ScreenPlayWindow/src/macbridge.h

@@ -1,4 +1,15 @@
-#ifndef MACBRIDGE_H
-#define MACBRIDGE_H
+#pragma once
 
-#endif // MACBRIDGE_H
+#include <QApplication>
+
+class MacBridge : public QObject
+{
+    Q_OBJECT
+
+private:
+    static MacBridge* bridge;
+    MacBridge();
+public:
+    static MacBridge* instance();
+    static void SetBackgroundLevel(QWindow* window);
+};