qt笔记之qml下拉标签组合框增加发送按钮发送标签内容

code review!

1.运行

2.文件结构

3.main.qml

代码

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Window 2.2Window {visible: truewidth: 640height: 480title: qsTr("QML ComboBox C++ signal")property string selectedOptionComboBox {id: comboBoxx: 12y: 58width: 147height: 25model: ["选项一", "选项二", "选项三"]Component.onCompleted: {selectedOption = "选项一"}onCurrentIndexChanged: {selectedOption = comboBox.currentText;}}Button {id: buttonx: 18y: 134text: qsTr("发送")onClicked: {myClass_rename.setValue(selectedOption);}}
}

4.main.cc

代码

#include "MyClass.h"
#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>Q_DECLARE_METATYPE(MyClass *)int main(int argc, char *argv[]) {QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);QGuiApplication app(argc, argv);QQmlApplicationEngine engine;MyClass myClass;engine.rootContext()->setContextProperty("myClass_rename", &myClass);engine.load(QUrl(QStringLiteral("qrc:/main.qml")));if (engine.rootObjects().isEmpty())return -1;return app.exec();
}

5.MyClass.h

代码

#ifndef MYCLASS_H
#define MYCLASS_H#include <QObject>
#include <QString>
#include <QVector>
#include <iomanip>
#include <iostream>class MyClass : public QObject {Q_OBJECTpublic:explicit MyClass(QObject *parent = nullptr);public slots:void setValue(QString value);
};#endif // MYCLASS_H

6.MyClass.cc

代码

#include "MyClass.h"
#include <QDebug>MyClass::MyClass(QObject *parent) : QObject(parent) {}void MyClass::setValue(QString value) {qDebug() << "value= " << value;
}

7.CMakeLists.txt

代码

cmake_minimum_required(VERSION 2.8.12)project(ComboBox LANGUAGES CXX)
set(Qt5_DIR "/home/user/Qt/5.15.2/gcc_64/lib/cmake/Qt5")
set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)find_package(Qt5 COMPONENTS Core Quick REQUIRED)include_directories(
#   "src""*.h"
)file (GLOB SRCS
#   "src/cc/*.cc""*.cc"
)file (GLOB INCS
#   "src/inc/*.h""*.h"
)add_executable(${PROJECT_NAME} ${SRCS} ${INCS} "main.cc" "qml.qrc")target_link_libraries(${PROJECT_NAME} Qt5::Core Qt5::Quick -pthread)

8.ComboBox.pro

代码

QT += quick qml
CONFIG += c++11INCLUDEPATH += ./LIBS += -L/usr/lib/x86_64-linux-gnu -lz
LIBS += /usr/lib/x86_64-linux-gnu/libboost_*
#LIBS += /usr/lib/aarch64-linux-gnu/libboost_*# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Refer to the documentation for the
# deprecated API to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \./main.ccRESOURCES += ./qml.qrc \
# image.qrc# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH # Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

9.qml.qrc

代码

<RCC><qresource prefix="/"><file>main.qml</file></qresource>
</RCC>