1.标准对话框

各种基本对话框通过调用格子不同的静态函数来完成其功能：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
private:
    QPushButton *btn1;
private slots:
    void on_click();
};

#endif // WIDGET_H

#include "widget.h"
#include <QHBoxLayout>
#include <QFileDialog>
#include <QMessageBox>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    btn1 = new QPushButton;
    btn1->setText(tr("对话框"));
    QHBoxLayout *layout1 = new QHBoxLayout(this);
    layout1->addWidget(btn1);
    connect(btn1, SIGNAL(clicked()),this, SLOT(on_click()));
}

Widget::~Widget()
{

}

void Widget::on_click()
{
    QString s = QFileDialog::getOpenFileName(this, "open file", "/", "c++ files(*.cpp)");
    QMessageBox::information(this, "你打开的文件", s);
}

运行结果：

结论：

  getOpenFileName返回的是文件的全路径名称，并不会执行代开文件的操作。操作文件需要代码另外实现。

2.toolbox类

通过实现类似QQ抽屉效果的实例来介绍QToolBox类的使用

#include "widget.h"
#include <QApplication>
#include "drawer.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Drawer d;//实例化
    d.resize(200, 500);//调整窗口大小
    d.show();//将窗口显示到桌面

    return a.exec();
}

#ifndef DRAWER_H
#define DRAWER_H

#include <QToolBox>
#include <QToolButton>

class Drawer : public QToolBox
{
    Q_OBJECT
public:
    explicit Drawer(QWidget *parent = 0);

signals:

public slots:
private slots:
    void on_click();
private:
    QToolButton *toolBtn1;
    QToolButton *toolBtn2;
    QToolButton *toolBtn3;
    QToolButton *toolBtn4;

};

#endif // DRAWER_H

#include "drawer.h"
#include <QGroupBox>
#include <QVBoxLayout>
#include <QMessageBox>

Drawer::Drawer(QWidget *parent) :
    QToolBox(parent)
{
    setWindowTitle(tr("QQ"));//设置窗体的标题
    toolBtn1 = new QToolButton;
    toolBtn1->setText(tr("赵云"));//设置按钮标题
    toolBtn1->setIcon(QPixmap("zy.jpg"));//设置图像
    toolBtn1->setIconSize(QPixmap("zy.jpg").size());//设置按钮大小和图像一致
    toolBtn1->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);//设置文字在图像旁边

    toolBtn2 = new QToolButton;
    toolBtn2->setText(tr("关羽"));//设置按钮标题
    toolBtn2->setIcon(QPixmap("gy.jpg"));//设置图像
    toolBtn2->setIconSize(QPixmap("gy.jpg").size());//设置按钮大小和图像一致
    toolBtn2->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);//设置文字在图像旁边

    toolBtn3 = new QToolButton;
    toolBtn3 = new QToolButton;
    toolBtn3->setText(tr("刘备"));//设置按钮标题
    toolBtn3->setIcon(QPixmap("lb.jpg"));//设置图像
    toolBtn3->setIconSize(QPixmap("lb.jpg").size());//设置按钮大小和图像一致
    toolBtn3->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);//设置文字在图像旁边

    toolBtn4 = new QToolButton;
    toolBtn4 = new QToolButton;
    toolBtn4->setText(tr("张飞"));//设置按钮标题
    toolBtn4->setIcon(QPixmap("zf.jpg"));//设置图像
    toolBtn4->setIconSize(QPixmap("zf.jpg").size());//设置按钮大小和图像一致
    toolBtn4->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);//设置文字在图像旁边

    QGroupBox *groupBox1 = new QGroupBox;
    QVBoxLayout *layout1 = new QVBoxLayout(groupBox1);
    layout1->setMargin(10);//布局中各个窗体的显示间距
    layout1->setAlignment(Qt::AlignHCenter);//布局中各个窗体的显示位置
    layout1->addWidget(toolBtn1);
    layout1->addWidget(toolBtn2);

    QGroupBox *groupBox2 = new QGroupBox;
    QVBoxLayout *layout2 = new QVBoxLayout(groupBox2);
    layout2->setMargin(10);//布局中各个窗体的显示间距
    layout2->setAlignment(Qt::AlignHCenter);//布局中各个窗体的显示位置
    layout2->addWidget(toolBtn3);
    layout2->addWidget(toolBtn4);

    this->addItem(groupBox1, tr("我的好友"));
    this->addItem(groupBox2, tr("陌生人"));
    connect(toolBtn1, SIGNAL(clicked()), this, SLOT(on_click()));

}

void Drawer::on_click()
{
    QMessageBox::about(this, "发送消息", "测试");
}