我最近遇到了QSignalMapper的问题。我无法将信号映射(QObject *)触发
我目前有一个qml对象keyboard.qml
已分配并从c ++类keyboardManager.cpp
中删除。在keyboard.qml
我有以下信号:
signal keyboardOpening
signal keyboardOpened
signal keyboardClosing
signal keyboardClosed
和这个功能:
function close() {
popDelay.stop();
closing = true;
keyboardClosing();
state = "OFFSCREEN";
}
信号
signal keyboardClosed
当与状态更改相关的所有动画完成时触发
在c ++中,我有一个方法和一个插槽
//method
void KeyboardManager::beginRemoveKeyboard(TouchTextField *target);
//slot
void KeyboardManager::endRemoveKeyboard(QObject *target);
在beginRemoveKeyboard中我尝试将keyboardClosed连接到endRemoveKeyboard,这样我就可以释放内存并正确注销所有指针,所以我做了这个测试:
在QML中:
onKeyboardClosed: console.debug("closed");
在C ++中:
void KeyboardManager::test() { qDebug() << "test"; }
void KeyboardManager::beginRemoveKeyboard(TouchTextField *target)
{
NewKeyboard *currentKeyboard = m_keyboards.value(target);
QSignalMapper* signalMapper = new QSignalMapper(this);
QObject::connect(currentKeyboard, SIGNAL(keyboardClosed()), signalMapper, SLOT(map()));
QObject::connect(currentKeyboard, SIGNAL(keyboardClosed()), this, SLOT(test()));
signalMapper->setMapping(this, (QObject*)target);
QObject::connect(signalMapper, SIGNAL(mapped(QObject*)), this, SLOT(endRemoveKeyboard(QObject*)));
QMetaObject::invokeMethod(currentKeyboard, "close");
}
void KeyboardManager::endRemoveKeyboard(QObject *target)
{
qDebug() << "deletion started";
TouchTextField* actualTarget = qobject_cast<TouchTextField*>(target);
NewKeyboard *currentKeyboard = m_keyboards.value(actualTarget);
actualTarget->setKeyboard(NULL);
m_keyboards.remove(actualTarget);
delete currentKeyboard;
if (sender())
delete sender(); //QSignalMapper
}
然而,当我调用KeyboardManager :: beginRemoveKeyboard并得到:
[DEBUG]closed (qrc:///main.qml:24, )
[DEBUG] test (tmp/debug/moc/../../../include/keyboard/KeyboardManager.h:31, void KeyboardManager::test())
就是这样。没有“删除已开始”,这意味着KeyboardClosed()
已被触发,test()
被调用但endRemoveKeyboard(QObject*)
未被调用。为什么以及如何实现我的目标?