Just took a look at how we handle it and you have to go OS-level to hook into that event to make it work with panels in Qt.
On WIndows, we setup a windows hook (SetWindowsHookEx) and then handle is thusly:
HWND GetCurrentDocumentWindow(); // you need to implement this, it's a bit of a pain
// the document window is the window of type OWLDocument (use Spy++) to find.
// We typically poll all the OWLDocument windows whenever we get a 'document opened' notifier from AI
// and the assumption is the first one we see that we didn't already know about is the OWLDocument associated
// with the new document (AIDocumentHandle); internally we store that association using a std::map<AIDocumentHandle, HWND>;
// this function just looks that up using AIDocument::GetDocument() as the key
bool IsPanelWindow(); // we keep track of all our panels and this basically just indicates if it's one of ours or not
bool IsChildOfPanelWindow(); // uses IsChild() to iterate over the children of all registered panel windows
HWND GetRootParent(HWND child)
{
HWND current = GetParent(child);
HWND result = 0;
while (current != 0) {
result = current;
current = GetParent(current);
}
return result;
}
void SetFocusToIllustrator()
{
// you need to push the application context here
HWND docid = CDocumentList::GetCurrentDocumentWindow();
HWND parentId = GetRootParent(docid);
SetFocus(parentId);
}
LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
if (nCode == HC_ACTION && wParam == WM_MOUSEWHEEL && !QApplication::activeModalWidget()) {
MOUSEHOOKSTRUCTEX* info = (MOUSEHOOKSTRUCTEX*)lParam;
POINT location = info->pt;
QWidget* w = QApplication::topLevelAt(location.x, location.y);
if (w) {
QPoint qp(location.x, location.y);
QWidget* child = w->childAt(w->mapFromGlobal(qp));
if (child) {
short delta = (short)(HIWORD(info->mouseData)); // high order is delta
QWheelEvent* w = new QWheelEvent(child->mapFromGlobal(qp), qp, delta, 0, 0);
QApplication::postEvent(child, w);
return 1; // eat the event
}
} else {
const HWND activeWindow = GetActiveWindow();
// if the focus window is not illustrator then check if the focus window is one of our panel windows
if (activeWindow != GetRootParent(GetCurrentDocumentWindow())) {
// if the mouse isn't over a qt window, but one of our windows has focus, then set focus back to illustrator
if (IsPanelWindow(focusWindowm) || IsChildOfPanelWindow(focusWindowm)) {
SetFocusToIllustrator();
}
}
}
}
// g_windowMouseHook is what you get back when you register the mouse hook
LRESULT result = CallNextHookEx(g_windowMouseHook, nCode, wParam, lParam);
return result;
}
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