Qt的布局

Qt的布局

Qt的布局有四种：

1. 垂直布局：QVBoxLayout
2. 水平布局：QHBoxLayout
3. 网格布局：QGridLayout
4. 表单布局：QFormLayout

垂直布局

MainWindow::MainWindow(QWidget *parent): QWidget(parent)
{QWidget *window = new QWidget(this);QPushButton *button1 = new QPushButton("One");QPushButton *button2 = new QPushButton("Two");QPushButton *button3 = new QPushButton("Three");QPushButton *button4 = new QPushButton("Four");QPushButton *button5 = new QPushButton("Five");QVBoxLayout *layout = new QVBoxLayout(window);layout->addWidget(button1);layout->addWidget(button2);layout->addWidget(button3);layout->addWidget(button4);layout->addWidget(button5);window->show();}

MainWindow::MainWindow(QWidget *parent): QWidget(parent)
{QPushButton *button1 = new QPushButton("One");QPushButton *button2 = new QPushButton("Two");QPushButton *button3 = new QPushButton("Three");QPushButton *button4 = new QPushButton("Four");QPushButton *button5 = new QPushButton("Five");QVBoxLayout *layout = new QVBoxLayout(this);layout->addWidget(button1);layout->addWidget(button2);layout->addWidget(button3);layout->addWidget(button4);layout->addWidget(button5);}

水平布局

QWidget *window = new QWidget(this);QPushButton *button1 = new QPushButton("One");QPushButton *button2 = new QPushButton("Two");QPushButton *button3 = new QPushButton("Three");QPushButton *button4 = new QPushButton("Four");QPushButton *button5 = new QPushButton("Five");QHBoxLayout *layout = new QHBoxLayout(window);layout->addWidget(button1);layout->addWidget(button2);layout->addWidget(button3);layout->addWidget(button4);layout->addWidget(button5);window->show();![请添加图片描述](.png)

网格布局

 QWidget *window = new QWidget(this);QPushButton *button1 = new QPushButton("One");QPushButton *button2 = new QPushButton("Two");QPushButton *button3 = new QPushButton("Three");QPushButton *button4 = new QPushButton("Four");QPushButton *button5 = new QPushButton("Five");QGridLayout *layout = new QGridLayout(window);layout->addWidget(button1,0,0);layout->addWidget(button2,0,1);layout->addWidget(button3,1,0);layout->addWidget(button4,1,1);layout->addWidget(button5,2,0);window->show();

表单布局

    QFormLayout *formLayout = new QFormLayout;QLineEdit *nameLineEdit = new QLineEdit;QLineEdit *emailLineEdit = new QLineEdit;QSpinBox *ageSpinBox = new QSpinBox;formLayout->addRow(tr("&Name:"), nameLineEdit);formLayout->addRow(tr("&Email:"), emailLineEdit);formLayout->addRow(tr("&Age:"), ageSpinBox);setLayout(formLayout);

布局的空白设置

QSpacerItem负责在布局中提供空白的部分。一般， 我们不直接使用这个类。Qt内置布局管理器提供了一些方法来设置空白的部分，如：addSpacing(), addStretch(), insertSpacing(), insertStretch()等等，如：

    QFormLayout *formLayout = new QFormLayout;QLineEdit *nameLineEdit = new QLineEdit;QLineEdit *emailLineEdit = new QLineEdit;QSpinBox *ageSpinBox = new QSpinBox;formLayout->addRow(tr("&Name:"), nameLineEdit);formLayout->setSpacing(30);formLayout->addRow(tr("&Email:"), emailLineEdit);formLayout->addRow(tr("&Age:"), ageSpinBox);setLayout(formLayout);