// 稍微复杂点的布局
#include <QApplication>
#include <QFont>
#include <QGridLayout>
#include <QLCDNumber>
#include <QPushButton>
#include <QSlider>
#include <QVBoxLayout>
#include <QWidget>

//LCDRange类
class LCDRange : public QWidget
{
public:
        LCDRange(QWidget *parent = 0);
};

LCDRange::LCDRange(QWidget *parent)
        : QWidget(parent)
{
  //LCD数字
        QLCDNumber *lcd = new QLCDNumber(2);
        lcd->setSegmentStyle(QLCDNumber::Flat);

  //Slider
        QSlider *slider = new QSlider(Qt::Horizontal);
        slider->setRange(0, 99);
        slider->setValue(0);
        connect(slider, SIGNAL(valueChanged(int)),lcd, SLOT(display(int)));

  //布局
        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(lcd);
        layout->addWidget(slider);
        setLayout(layout);
}

class MyWidget : public QWidget
{
public:
        MyWidget(QWidget *parent = 0);
};


//MyWidget类
MyWidget::MyWidget(QWidget *parent)
        : QWidget(parent)
{
  //创建quit按钮
        QPushButton *quit = new QPushButton(tr("Quit"));
        quit->setFont(QFont("Times", 18, QFont::Bold));
        connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));

  //网格布局
        QGridLayout *grid = new QGridLayout;
        for (int row = 0; row < 3; ++row) {
                for (int column = 0; column < 3; ++column) {
                        LCDRange *lcdRange = new LCDRange;//创建LCD+Slider
                        grid->addWidget(lcdRange, row, column);
                }
        }

        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(quit);
        layout->addLayout(grid);//子布局
        
        setLayout(layout);//设置布局
}

int main(int argc, char *argv[])
{
        QApplication app(argc, argv);
        
        //创建MyWidget的一个实例
        MyWidget widget;
        widget.show();
        
        return app.exec();
}
 
 
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