bool QClipboard::event(QEvent *e)
{
if (e->type() != QEvent::Clipboard)
return QObject::event(e);
QClipboardData *d = clipboardData();
MSG *m = (MSG *)((QClipboardEvent*)e)->data();
if (!m) {
// this is sent to render all formats at app shut down
if (ownsClipboard()) {
OleFlushClipboard();
d->releaseIData();
}
return true;
}
bool propagate = false;
if (m->message == WM_CHANGECBCHAIN) {
if ((HWND)m->wParam == d->nextClipboardViewer)
d->nextClipboardViewer = (HWND)m->lParam;
else
propagate = true;
} else if (m->message == WM_DRAWCLIPBOARD) {
emitChanged(QClipboard::Clipboard);
if (!ownsClipboard() && d->iData)
// clean up the clipboard object if we no longer own the clipboard
d->releaseIData();
propagate = true;
}
if (propagate && d->nextClipboardViewer) {
if (ptrIsHungAppWindow == 0) {
QSystemLibrary library(QLatin1String("User32"));
ptrIsHungAppWindow = (PtrIsHungAppWindow)library.resolve("IsHungAppWindow");
}
if (ptrIsHungAppWindow && ptrIsHungAppWindow(d->nextClipboardViewer)) {
qWarning("%s: Cowardly refusing to send clipboard message to hung application...", Q_FUNC_INFO);
} else if (isProcessBeingDebugged(d->nextClipboardViewer)) {
// Also refuse if the process is being debugged, specifically, if it is
// displaying a runtime assert, which is not caught by isHungAppWindow().
qWarning("%s: Cowardly refusing to send clipboard message to application under debugger...", Q_FUNC_INFO);
} else {
SendMessage(d->nextClipboardViewer, m->message, m->wParam, m->lParam);
}
}
return true;
}
void QWindowsClipboard::propagateClipboardMessage(UINT message, WPARAM wParam, LPARAM lParam) const
{
if (!m_nextClipboardViewer)
return;
// In rare cases, a clipboard viewer can hang (application crashed,
// suspended by a shell prompt 'Select' or debugger).
if (QWindowsContext::user32dll.isHungAppWindow
&& QWindowsContext::user32dll.isHungAppWindow(m_nextClipboardViewer)) {
qWarning("%s: Cowardly refusing to send clipboard message to hung application...", Q_FUNC_INFO);
return;
}
// Do not block if the process is being debugged, specifically, if it is
// displaying a runtime assert, which is not caught by isHungAppWindow().
if (isProcessBeingDebugged(m_nextClipboardViewer))
PostMessage(m_nextClipboardViewer, message, wParam, lParam);
else
SendMessage(m_nextClipboardViewer, message, wParam, lParam);
}
