Qt学习笔记之QComboBox、QFontComboBox、QSpinBox

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QComboBox 下拉列表框

#include <QApplication>#include <QComboBox>int main(int argc, char *argv[]){    QApplication a(argc, argv);    QComboBox *comboBox;    //实例 QComboBox    comboBox = new QComboBox();    //控件显示位置大小    comboBox->setGeometry(QRect(50,50,120,25));    //定义字符串列表    QStringList str;    str << "数学" << "语文" << "地理";    //将字符串列表绑定 QComboBox 控件    comboBox->addItems(str);    comboBox->show();    return a.exec();}

QFontComboBox 字体下拉列表框
main.cpp

#include "mainwindow.H"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    MainWindow m;    m.show();    return a.exec();}

mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QFontComboBox>#include <QPushButton>#include <QLabel>namespace Ui {class MainWindow;}class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    ~MainWindow();private:    Ui::MainWindow *ui;    QFontComboBox *fontComboBox;    QPushButton *button;    QLabel *label;   private slots:    void textButton();};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.H"#include "ui_mainwindow.h"MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow){    ui->setupUi(this);    //实例 QFontComboBox    fontComboBox = new QFontComboBox(this);    //实例 QPushButton    button = new QPushButton(this);    //实例 QLabel    label = new QLabel(this);    label->setGeometry(QRect(50,150,300,25));    //按钮名    button->setText("按钮");    //位置    button->move(180,50);    //事件    connect(button,SIGNAL(released()),this,SLOT(textButton()));    //QFontComboBox 控件位置    fontComboBox->setGeometry(QRect(50,50,120,25));}void MainWindow::textButton(){    label->setText("选择字体:"+fontComboBox->currentText());}MainWindow::~MainWindow(){    delete ui;}

QSpinBox 控件

#include <QApplication>#include <QSpinBox>int main(int argc, char *argv[]){    QApplication a(argc, argv);    QSpinBox *spinBox;    //实例 QSpinBox    spinBox = new QSpinBox();    //位置    spinBox->setGeometry(QRect(50,50,100,25));    //值范围    spinBox->setRange(0,200);    //初始值    spinBox->setValue(10);    //后缀    spinBox->setSuffix("元");    //前缀    spinBox->setPrefix("$");    spinBox->show();    return a.exec();}

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