bool QWindowsClipboard::clipboardViewerWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam, LRESULT *result)
{
enum { wMClipboardUpdate = 0x031D };
*result = 0;
if (QWindowsContext::verbose)
qCDebug(lcQpaMime) << __FUNCTION__ << hwnd << message << QWindowsGuiEventDispatcher::windowsMessageName(message);
switch (message) {
case WM_CHANGECBCHAIN: {
const HWND toBeRemoved = (HWND)wParam;
if (toBeRemoved == m_nextClipboardViewer) {
m_nextClipboardViewer = (HWND)lParam;
} else {
propagateClipboardMessage(message, wParam, lParam);
}
}
return true;
case wMClipboardUpdate: // Clipboard Format listener (Vista onwards)
case WM_DRAWCLIPBOARD: { // Clipboard Viewer Chain handling (up to XP)
const bool owned = ownsClipboard();
qCDebug(lcQpaMime) << "Clipboard changed owned " << owned;
emitChanged(QClipboard::Clipboard);
// clean up the clipboard object if we no longer own the clipboard
if (!owned && m_data)
releaseIData();
if (!m_formatListenerRegistered)
propagateClipboardMessage(message, wParam, lParam);
}
return true;
case WM_DESTROY:
// Recommended shutdown
if (ownsClipboard()) {
qCDebug(lcQpaMime) << "Clipboard owner on shutdown, releasing.";
OleFlushClipboard();
releaseIData();
}
return true;
} // switch (message)
return false;
}
bool QWindowsClipboard::clipboardViewerWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam, LRESULT *result)
{
*result = 0;
if (QWindowsContext::verboseOLE)
qDebug("%s HWND=%p 0x%x %s", __FUNCTION__, hwnd, message,
QWindowsGuiEventDispatcher::windowsMessageName(message));
switch (message) {
case WM_CHANGECBCHAIN: {
const HWND toBeRemoved = (HWND)wParam;
if (toBeRemoved == m_nextClipboardViewer) {
m_nextClipboardViewer = (HWND)lParam;
} else {
propagateClipboardMessage(message, wParam, lParam);
}
}
return true;
case WM_DRAWCLIPBOARD: {
const bool owned = ownsClipboard();
if (QWindowsContext::verboseOLE)
qDebug("Clipboard changed owned %d", owned);
emitChanged(QClipboard::Clipboard);
// clean up the clipboard object if we no longer own the clipboard
if (!owned && m_data)
releaseIData();
propagateClipboardMessage(message, wParam, lParam);
}
return true;
case WM_DESTROY:
// Recommended shutdown
if (ownsClipboard()) {
if (QWindowsContext::verboseOLE)
qDebug("Clipboard owner on shutdown, releasing.");
OleFlushClipboard();
releaseIData();
}
return true;
} // switch (message)
return false;
}
