add window message queue

GDP/D3D9/Window.cpp

@@ -10,6 +10,8 @@ INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
     wc.lpszClassName = TEXT("D3D9"); // class name
     wc.lpfnWndProc = WindowProc; // callback function for windows to communicate with our application
     wc.hbrBackground = CreateSolidBrush(RGB(0, 255, 0));
+    wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    wc.hIcon = LoadIcon(nullptr, IDI_APPLICATION);
     
     // 2. register window class
     if (!RegisterClass(&wc)) return 100;
@@ -40,8 +42,19 @@ INT Window::init(HINSTANCE hInstance, UINT width, UINT height)
 BOOL Window::run()
 {
     // 6. run window
+    // GetMessage - syncronous call which holds until a new message arrived
+    // PeekMessage - get last message from message queue or nothing if there is no message
+    // TranslateMessage - translates keyboard input
+    // DispatchMessage - send message to WindowProcedure
+
+    MSG msg = {};
+    if (PeekMessage(&msg, nullptr, 0, UINT_MAX, PM_REMOVE))
+    {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
     
-    return true;
+    return msg.message != WM_QUIT;
 }
 
 void Window::deInit()
@@ -50,5 +63,20 @@ void Window::deInit()
 
 LRESULT WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
+    switch (msg)
+    {
+    case WM_CLOSE:
+        DestroyWindow(hWnd);
+        return 0;
+
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        return 0;
+
+    case WM_KEYDOWN:
+        if (wParam == VK_ESCAPE) DestroyWindow(hWnd);
+        break;
+    }
+
     return DefWindowProc(hWnd, msg, wParam, lParam);
 }