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 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("QML ComboBox C++ signal")

    property string selectedOption

    ComboBox {
        id: comboBox
        x: 12
        y: 58
        width: 147
        height: 25
        model: ["选项一", "选项二", "选项三"]

        Component.onCompleted: {
            selectedOption = "选项一"
        }

        onCurrentIndexChanged: {
            selectedOption = comboBox.currentText;
        }
    }

    Button {
        id: button
        x: 18
        y: 134
        text: 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_OBJECT

  public:
    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++11

INCLUDEPATH += ./

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 6.0.0

SOURCES += \
        ./main.cc

RESOURCES += ./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>