Handle when IE window moves - Visual C++

Question

I want to handle window move events. My first try was to handle DWebBrowserEvents2::WindowSetHeight, WindowSetLeft, WindowSetTop and WindowSetWidth events, but for some reasons, these events didn't get fired at all.I've handled window resize by handling HTMLWindowEvents2::onresize. How would I handle when the window moves? I've also tried implementing IHTMLOMWindowServices, but its members are not called when window position changes. Are there any suggestions as to to what would be a good interface to implement? I'm creating an IE extension using ATL in Visual C++.

Answer 1

HTML window is not the right place. You need to go one level up to the browser window level, e.g.:

      // Get a handle for the IE window and set a hook for the window resize/move events
  m_spWebBrowser->get_HWND(reinterpret_cast<SHANDLE_PTR*>(&m_pWebBrowserHwnd));
  if(m_pWebBrowserHwnd)
  {
   int idHook = WH_CALLWNDPROC; // Type of hook: all Window calls
   HOOKPROC hookProc = MyClass::OnWindowMessage; // Procedure to be called
   HINSTANCE hMod = NULL; // DLL to monitor
   DWORD dwThreadId = GetWindowThreadProcessId(m_pWebBrowserHwnd,NULL); // IE Thread to monitor
   m_ResizeHook = SetWindowsHookEx(idHook, hookProc, hMod, dwThreadId); 
   Trace (L"Hook for window move/resize is set up");
  }

Then onWindowMessage handles the right message:

LRESULT CALLBACK MyClass::OnWindowMessage(int nCode, WPARAM wParam, LPARAM lParam)
{

LRESULT result = CallNextHookEx(NULL, nCode, wParam, lParam);

if( (lParam!=NULL) && (nCode == HC_ACTION))
{
 CWPSTRUCT *CwpStruct = (CWPSTRUCT *) lParam;
 switch(CwpStruct->message)
 {
 case WM_MOVE:
  HWND manipluatedHWND = CwpStruct->hwnd;
         //Code to execute when window moves
  break;
 }
}

Enjoy :)

Answer 2

Okay, here's some rough code

class ATL_NO_VTABLE CHelloWorldBHO :
   public CComObjectRootEx<CComSingleThreadModel>,
   public CComCoClass<CHelloWorldBHO, &CLSID_HelloWorldBHO>,
   public IObjectWithSiteImpl<CHelloWorldBHO>,
   public IDispatchImpl<IHelloWorldBHO, &IID_IHelloWorldBHO, &LIBID_HelloWorldLib, /*wMajor =*/ 1, /*wMinor =*/ 0>,
   public IDispEventImpl<1, CHelloWorldBHO, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 1>, 
  //Other interfaces here

{

         BEGIN_SINK_MAP(CHelloWorldBHO)
            SINK_ENTRY_EX(1, DIID_DWebBrowserEvents2, DISPID_DOCUMENTCOMPLETE, OnDocumentComplete)//Do stuff OnDocumentComplete
         END_SINK_MAP()

     void STDMETHODCALLTYPE OnDocumentComplete(IDispatch *pDisp, VARIANT *pvarURL){
         //Do other stuff here
         SetUpWindowsHook();//This calls a function that sets a window hook, similar to the code that you've posted
     }

}

Answer 3

Handled the situation by using Timer. Not too elegant, but works!