qt4

问题 Generally speaking, what is the correct way to deep copy Qt containers? I'm not worried about deep copying the containers recursively, although addressing such would be helpful. 回答1: Despite what everyone will tell you - that you don't deep copy Qt containers - there are situations in which you simply need to perform an actual deep copy instead of just a shallow one. To do that, use detach() : container1 = container2; container1.detach(); 来源： https://stackoverflow.com/questions/16800206/how

问题 I'm using QTableView and QStandardItemModel now. In the QTableView, if you double-click a cell, this cell will get into edit mode and you can edit its content. Now I have a problem, I want to trigger the edit mode of an item by code (by command), what should I do? I cannot find proper function or slot in QTableView or QStandardItemModel. Do I need to emit any signal to get into edit mode? And which signal I should catch if I want to know when the editing is finish (user press "Enter" or click

问题 I'm trying to have a multi-line checkbox/radiobutton with Qt using standard QCheckbox/QRadioButton. I didn't find the direct solution since QRadioButton{wrap:true;} has no effect. The only thing possible would be to access to the QRadioButton->label->setLineWrap(true) but I'd like to do that from the designer not having to rewrite a widget Any idea beside putting a QRadioButton and a QLabel next to each others? Thx, Boris. 回答1: That indeed is really annoying and cannot be solved without

问题 I'm working on a custom Qt button that allows you to edit the text on the button if you double click it. When the button is double clicked, a QLineEdit appears where the text on the button is allowing the user to edit the text on the button. My requirement is that if the user clicks anywhere in the application window, the QLineEdit should disappear and cancel the edit operation. This works in some cases. Specifically, it works if I click on anything that is capable of text entry. Other

问题 It's wired that Qt Creator didn't have a syntax highlight for its own style file format , or did i missed some packages ? VER: Qt Creator 2.1.0 回答1: I could not find any evidence in Qt's documentation that .qss is an officially designated file extension. I'd say just change it to .css . 回答2: Go to Tools > Options > Environment > Mime types Find text/css and add *.qss to patterns. 来源： https://stackoverflow.com/questions/7624656/no-syntax-highlight-for-qss-file-in-qt-creator

问题 I have two overlapping widgets in a window child A and child B. Child A is above B and gets mouse events but sometimes the click should pass through and eventually hit child B. The ideal solution would have been to use event->ignore() but this passes the event to the parent widget, not siblings. The "pass all" solution setAttribute(Qt::WA_TransparentForMouseEvents); does not work either because child A needs to capture some events. How do I tell Qt "I do not want to handle this event, act

问题 I'm wondering if anyone knows of, perhaps a flag to disable the gray dotted border that appears when you single click on a QTableWidget's cell. Thanks. 回答1: C++: tableWidget->setFocusPolicy(Qt::NoFocus); Python: tableWidget.setFocusPolicy(QtCore.Qt.NoFocus) Be aware that you will lose the ability to process keyboard events, but mouse events will work fine. 回答2: It seems like you want to remove the border when the cell get the focus. Try editing the Stylesheet as follows. QTableWidget {

问题 I am trying to connect my application with a web service and here ,a user suggested to send custom headers back to my application. I am using this code void Coonnec::serviceRequestFinished(QNetworkReply *reply) { QByteArray bytes = reply->readAll(); if (reply->error() != QNetworkReply::NoError) { qDebug() << "Reply error: " + reply->errorString(); } else { qDebug() << "Uploaded: " + QDateTime::currentDateTime().toString(); qDebug() << reply->rawHeaderList(); } reply->close(); bytes.clear();

问题 I don't have much experience with QT and this problem came out today. QList<int> memList; const int large = 100000; getchar(); for (int i=0; i<large; i++) { memList.append(i); } cout << memList.size() << endl; getchar(); for (int i=0; i<large; i++) { memList.removeLast(); } cout << memList.size() << endl; getchar(); After first loop when I check memory usage it goes up as new elements are appended to the memList but after removing them within second loop the memory usage stays at the same

问题 I have a template based class [Allotter.h & Allotter.cpp]: template <typename allotType> class Allotter { public: Allotter(); quint32 getAllotment(allotType*); bool removeAllotment(quint32, int auto_destruct = 0); private: QVector<QPair<quint32, allotType*>> indexReg; int init_topIndex; }; and it's usage is shown as [ActiveListener.h & ActiveListener.cpp]: class ActiveListener: public QObject { Q_OBJECT public: ActiveListener(); private slots: void processConnections(); void readFromSocket