// handle the ACTIVATE hook event
private void HandleActivateEvent(IntPtr wParam, IntPtr lParam)
{
if (WindowActivate != null)
{
CbtEventArgs e = new CbtEventArgs(wParam, lParam);
WindowActivate(this, e);
}
}
// handle the DESTROYWND hook event
private void HandleDestroyWndEvent(IntPtr wParam, IntPtr lParam)
{
if (WindowDestroye != null)
{
CbtEventArgs e = new CbtEventArgs(wParam, lParam);
WindowDestroye(this, e);
}
}
// handle the CREATEWND hook event
private void HandleCreateWndEvent(IntPtr wParam, IntPtr lParam)
{
if (WindowCreate != null)
{
CbtEventArgs e = new CbtEventArgs(wParam, lParam);
WindowCreate(this, e);
}
}
// handle the DESTROYWND hook event
private void HandleDestroyWndEvent(IntPtr wParam, IntPtr lParam)
{
if (WindowDestroye != null)
{
CbtEventArgs e = new CbtEventArgs(wParam, lParam);
WindowDestroye(this, e);
}
}
public void WndActivate(object sender, CbtEventArgs e)
{
IntPtr hMsgBox = e.wParam;
// try to find a howner for this message box
if (hOwner == IntPtr.Zero)
hOwner = USER32.GetActiveWindow();
// get the MessageBox window rect
RECT rectDlg = new RECT();
USER32.GetWindowRect(hMsgBox, ref rectDlg);
// get the owner window rect
RECT rectForm = new RECT();
USER32.GetWindowRect(hOwner, ref rectForm);
// get the biggest screen area
Rectangle rectScreen = API.TrueScreenRect;
// if no parent window, center on the primary screen
if (rectForm.right == rectForm.left)
rectForm.right = rectForm.left = Screen.PrimaryScreen.WorkingArea.Width / 2;
if (rectForm.bottom == rectForm.top)
rectForm.bottom = rectForm.top = Screen.PrimaryScreen.WorkingArea.Height / 2;
// center on parent
int dx = ((rectDlg.left + rectDlg.right) - (rectForm.left + rectForm.right)) / 2;
int dy = ((rectDlg.top + rectDlg.bottom) - (rectForm.top + rectForm.bottom)) / 2;
rect = new Rectangle(
rectDlg.left - dx,
rectDlg.top - dy,
rectDlg.right - rectDlg.left,
rectDlg.bottom - rectDlg.top);
// place in the screen
if (rect.Right > rectScreen.Right) rect.Offset(rectScreen.Right - rect.Right, 0);
if (rect.Bottom > rectScreen.Bottom) rect.Offset(0, rectScreen.Bottom - rect.Bottom);
if (rect.Left < rectScreen.Left) rect.Offset(rectScreen.Left - rect.Left, 0);
if (rect.Top < rectScreen.Top) rect.Offset(0, rectScreen.Top - rect.Top);
if (e.IsDialog)
{
// do the job when the WM_INITDIALOG message returns
wndProcRetHook = new WndProcRetHook(hMsgBox);
wndProcRetHook.WndProcRet += new WndProcRetHook.WndProcEventHandler(WndProcRet);
wndProcRetHook.Install();
}
else
USER32.MoveWindow(hMsgBox, rect.Left, rect.Top, rect.Width, rect.Height, 1);
// uninstall this hook
WindowsHook wndHook = (WindowsHook)sender;
Debug.Assert(cbtHook == wndHook);
cbtHook.Uninstall();
cbtHook = null;
}