- bool QObject::connect(const QObject *sender, const char *signal,
- const QObject *receiver, const char *method,
- Qt::ConnectionType type)
- {
- {
- const void *cbdata[] = { sender, signal, receiver, method, &type };
- if (QInternal::activateCallbacks(QInternal::ConnectCallback, (void **) cbdata))
- return true;
- }
- if (sender == 0 || receiver == 0 || signal == 0 || method == 0) {
- qWarning("QObject::connect: Cannot connect %s::%s to %s::%s",
- sender ? sender->metaObject()->className() : "(null)",
- (signal && *signal) ? signal+1 : "(null)",
- receiver ? receiver->metaObject()->className() : "(null)",
- (method && *method) ? method+1 : "(null)");
- return false;
- }
- QByteArray tmp_signal_name;
- if (!check_signal_macro(sender, signal, "connect", "bind"))
- return false;
- const QMetaObject *smeta = sender->metaObject();
- const char *signal_arg = signal;
- ++signal; //skip code
- int signal_index = smeta->indexOfSignal(signal);
- if (signal_index < 0) {
- // check for normalized signatures
- tmp_signal_name = QMetaObject::normalizedSignature(signal - 1);
- signal = tmp_signal_name.constData() + 1;
- signal_index = smeta->indexOfSignal(signal);
- if (signal_index < 0) {
- err_method_notfound(sender, signal_arg, "connect");
- err_info_about_objects("connect", sender, receiver);
- return false;
- }
- }
- QByteArray tmp_method_name;
- int membcode = extract_code(method);
- if (!check_method_code(membcode, receiver, method, "connect"))
- return false;
- const char *method_arg = method;
- ++method; // skip code
- const QMetaObject *rmeta = receiver->metaObject();
- int method_index = -1;
- switch (membcode) {
- case QSLOT_CODE:
- method_index = rmeta->indexOfSlot(method);
- break;
- case QSIGNAL_CODE:
- method_index = rmeta->indexOfSignal(method);
- break;
- }
- if (method_index < 0) {
- // check for normalized methods
- tmp_method_name = QMetaObject::normalizedSignature(method);
- method = tmp_method_name.constData();
- switch (membcode) {
- case QSLOT_CODE:
- method_index = rmeta->indexOfSlot(method);
- break;
- case QSIGNAL_CODE:
- method_index = rmeta->indexOfSignal(method);
- break;
- }
- }
- if (method_index < 0) {
- err_method_notfound(receiver, method_arg, "connect");
- err_info_about_objects("connect", sender, receiver);
- return false;
- }
- if (!QMetaObject::checkConnectArgs(signal, method)) {
- qWarning("QObject::connect: Incompatible sender/receiver arguments"
- "\n %s::%s --> %s::%s",
- sender->metaObject()->className(), signal,
- receiver->metaObject()->className(), method);
- return false;
- }
- int *types = 0;
- if ((type == Qt::QueuedConnection || type == Qt::BlockingQueuedConnection)
- && !(types = queuedConnectionTypes(smeta->method(signal_index).parameterTypes())))
- return false;
- QMetaObject::connect(sender, signal_index, receiver, method_index, type, types);
- const_cast<QObject*>(sender)->connectNotify(signal - 1);
- return true;
- }
connect的实现代码
最新推荐文章于 2023-12-17 22:26:51 发布