Qt随笔 - QVBoxLayout和QHBoxLayout

关系图

• 垂直布局：QVBoxLayout
  先来一两代码：

QWidget *widget = new QWidget();
QVBoxLayout * vBoxLayout = new QVBoxLayout();
QLabel *label = new QLabel("hello");
QPushButton *pushButton = new QPushButton("hi");
vBoxLayout->addWidget(label);
vBoxLayout->addWidget(pushButton);
widget->setLayout(vBoxLayout);
widget->show();

效果：

QVBoxLayout

• 水平布局：QHBoxLayout
  一样：

QWidget *widget = new QWidget();
QHBoxLayout * hBoxLayout = new QHBoxLayout();
QLabel *label = new QLabel("hello");
QPushButton *pushButton = new QPushButton("hi");
hBoxLayout->addWidget(label);
hBoxLayout->addWidget(pushButton);
widget->setLayout(hBoxLayout);
widget->show();

QHBoxLayout

• QHBoxLayout嵌套QVBoxLayout

QWidget *widget = new QWidget();
QHBoxLayout * hBoxLayout = new QHBoxLayout();
QVBoxLayout * vBoxLayout = new QVBoxLayout();
QLabel *label_text = new QLabel("Chengdu 1 – 3 Day Weather Forecast Summary");
QLabel *label_picture = new QLabel();
label_picture->setPixmap(QPixmap(":/weather").scaled(32,32, Qt::KeepAspectRatioByExpanding));
QPushButton *pushButton = new QPushButton("more");
vBoxLayout->addWidget(label_text);
vBoxLayout->addWidget(pushButton);
hBoxLayout->addWidget(label_picture);
hBoxLayout->addLayout(vBoxLayout);
widget->setLayout(hBoxLayout);
widget->show();

QHBoxLayout嵌套QVBoxLayout

• 总结
  1.向布局添加一个Widget:
  void QBoxLayout::addWidget(QWidget *widget, int stretch = 0, Qt::Alignment alignment = Qt::Alignment())
  2.向布局再添加一个布局
  void QBoxLayout::addLayout(QLayout *layout, int stretch = 0)�
  3.最后，使用它来确定Widget的布局
  void QWidget::setLayout(QLayout *layout)