qt5

问题 Version/Environment: Windows 10 64 bit Qt 5.11.0 MSVC2017 64 bit I have a simple QComboBox to enable/disable a feature: QComboBox *onOffComboBox = new QComboBox(); onOffComboBox->insertItem(0, "Off"); onOffComboBox->insertItem(1, "On"); The combo box is added as a cell widget to a table: this->ui->settingsTable->setCellWidget(rowNumber, 1, onOffComboBox); Now i want to change the background color of the button but not the select items. My first approach was simply to use QWidget 's

问题 I'm trying to test drive the QQmlPropertyMap class. It seems like it might work well for what I want, if I can subclass it. The documentation here even gives some rudimentary instructions on what to do for subclassing it. Said documentation also indicates that this class derives from QObject . For what it's worth, I'm using QtCreator 2.6.1 on Qt 5.0.0 with QtQuick 2.0. My main.qml: import QtQuick 2.0 Rectangle { width: 360 height: 360 Text { text: owner.field anchors.centerIn: parent }

问题 I'm trying to test drive the QQmlPropertyMap class. It seems like it might work well for what I want, if I can subclass it. The documentation here even gives some rudimentary instructions on what to do for subclassing it. Said documentation also indicates that this class derives from QObject . For what it's worth, I'm using QtCreator 2.6.1 on Qt 5.0.0 with QtQuick 2.0. My main.qml: import QtQuick 2.0 Rectangle { width: 360 height: 360 Text { text: owner.field anchors.centerIn: parent }

问题 From here: https://stackoverflow.com/a/28327499/462608 I tried this: cmake_minimum_required(VERSION 2.8.12) project(qtquick_hello_cmake) set(CMAKE_PREFIX_PATH "/opt/Qt5.9.1/5.9.1/") set(CMAKE_INCLUDE_CURRENT_DIR ON) set(CMAKE_AUTOMOC ON) set(CMAKE_AUTORCC ON) find_package(Qt5 COMPONENTS Quick Core REQUIRED) qt5_add_resources(RESOURCES qml.qrc) add_executable(${PROJECT_NAME} "main.cpp" "qml.qrc") qt5_use_modules(${PROJECT_NAME} Quick Core) target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5:

问题 I want to request and response directly instead of using connect(..,SLOT(finished()),..,SLOT()) 回答1: You can use a QEventLoop so that the application waits and can handle other events at the same time. #include <QCoreApplication> #include <QNetworkAccessManager> #include <QNetworkReply> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QNetworkAccessManager *manager = new QNetworkAccessManager; QEventLoop loop; QObject::connect(manager, &QNetworkAccessManager::finished, &loop

问题 I want to request and response directly instead of using connect(..,SLOT(finished()),..,SLOT()) 回答1: You can use a QEventLoop so that the application waits and can handle other events at the same time. #include <QCoreApplication> #include <QNetworkAccessManager> #include <QNetworkReply> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QNetworkAccessManager *manager = new QNetworkAccessManager; QEventLoop loop; QObject::connect(manager, &QNetworkAccessManager::finished, &loop

问题 In the new Qt 5.15.0 there is a new declarative way to register C++ types for usage in QML. I followed the steps given in Qt Help (https://doc.qt.io/qt-5/qtqml-cppintegration-definetypes.html#registering-an-instantiable-object-type) but it givens to me the following error: /.../randomnumbergenerator.h:10: error: ‘QML_ELEMENT’ does not name a type QML_ELEMENT ^~~~~~~~~~~ The class's definition is, for the moment: #ifndef RANDOMNUMBERGENERATOR_H #define RANDOMNUMBERGENERATOR_H #include <QObject

问题 Initially I made it in the main of the window I had made earlier 回答1: There is nothing complicated to open a 2 nd window (or dialog) with the main window. To demonstrate this, I made an MCVE. C++ source testQMainWindowWithQDialog.cc : // Qt header: #include <QtWidgets> class Dialog: public QDialog { private: QVBoxLayout _qVBox; QLabel _qLbl; public: Dialog(QWidget *pQParent = nullptr): QDialog(pQParent), _qLbl("the dialog") { setWindowTitle("the Dialog Window"); _qVBox.addWidget(&_qLbl, 1, Qt

问题 I'm looking to do something like the following: example But with radio buttons instead of checkboxes. In the above picture widgets are placed into groups which can be enabled/disabled, but I want only 1 group to be enabled at a time (in the example both Group A and Group C are enabled). I did the above example using QGroupBox, but it only provides normal checkboxes, not radio buttons as far as I can tell. 回答1: The ckeckbox that appears in the QGroupBox is not a QCheckBox , it is just a

问题 I feel like this should be pretty straightforward, but for my life I can't figure out how to draw a basic line using Qt 3D. The only guidance I've been able to find on the subject is this obscure video, in which there's an off-putting amount of raw byte buffer and memory manipulation going on via scarcely documented classes. Is there a better way to do this using the shiny new API that I'm missing? 回答1: From the video you linked, I came up with the code below (also posted in Qt forums: https: