控件的几何排列-Laying Out Widgets
#include
#include
#include
#include
#include
int main(int argc,char *argv[])
{
QApplication app(argc,argv);
QWidget *window=new QWidget;
window->setWindowTitle("Enter your age");
QSpinBox *spinBox=new QSpinBox;
QSlider *slider= new QSlider(Qt::Horizontal);
spinBox->setRange(0,130);
slider->setRange(0,130);
QObject::connect(spinBox,SIGNAL(valueChanged(int)),
slider,SLOT(setValue(int)));
QObject::connect(slider,SIGNAL(valueChanged(int)),
spinBox,SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout=new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->setLayout(layout);
window->show();
return app.exec();
}
效果如下:
如果没有 window->setLayout(layout);
效果如下:
如代码改为:
#include
#include
#include
#include
int main(int argc,char *argv[])
{
QApplication app(argc,argv);
QWidget *window=new QWidget;
window->setWindowTitle("Enter your age");
QSpinBox *spinBox=new QSpinBox;
QSlider *slider= new QSlider(Qt::Horizontal);
spinBox->setRange(0,130);
slider->setRange(0,130);
QObject::connect(spinBox,SIGNAL(valueChanged(int)),
slider,SLOT(setValue(int)));
QObject::connect(slider,SIGNAL(valueChanged(int)),
spinBox,SLOT(setValue(int)));
spinBox->setValue(35);
QHBoxLayout *layout=new QHBoxLayout;
layout->addWidget(spinBox);
layout->addWidget(slider);
window->show();
window->setLayout(layout);
return app.exec();
}
效果如下:
可见,写代码时的一点细微差别影响之大!
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