Technology Sharing

한어Русский языкEnglishFrançaisIndonesianSanskrit日本語DeutschPortuguêsΕλληνικάespañolItalianoSuomalainenLatina

Table of contents

1. Sub-window introduction:

2. Create a child window by code:

3. Set the subwindow title:

4. Add controls to the child window:

5. Set the sub-window docking position.

---

1. Sub-window introduction:

• In Qt, you can create and manage child windows (child window bodies) to implement multi-window applications.

• A child window can be a dialog box, an independent window, or an MDI (multiple document interface) child window.

• Create a child window through the QDockWidget class.

2. Create a child window by code:

• Create a child window object: QDockWidget* dockWidget = new QDockWidget();
• Add the child window to the main window: this->addDockWidget(Qt::LeftDockWidgetArea,dockWidget);

        

3. Set the subwindow title:

• Set the subwindow title:dockWidget->setWindowTitle("This is the title of the subwindow");

        

4. Add controls to the child window:

• Add controls to the child window. You cannot directly set child controls for this window.
• First, create a separate QWidget object and then set the controls to this QWidget object.
• Then set this QWidget object to the dockWidget.

    //为dockWidget赋予QWidget对象
    QWidget* container=new QWidget();
    dockWidget->setWidget(container);

• Since a dockWidget can only contain one QWidget object, if you want to add a new control, you still have to add it to the QWidget object.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QDockWidget* dockWidget=new QDockWidget();
    this->addDockWidget(Qt::LeftDockWidgetArea,dockWidget);
 
    dockWidget->setWindowTitle("这是子窗口的标题");
 
    //为dockWidget赋予QWidget对象
    QWidget* container=new QWidget();
    dockWidget->setWidget(container);
 
    //创建两个控件
    QLabel* label=new QLabel("这是一个label控件");
    QPushButton* pushButton=new QPushButton("这是一个按钮");
 
    //创建一个布局管理利器，并且设置到QWidget对象中
    QVBoxLayout* layout=new QVBoxLayout();
    container->setLayout(layout);
    
    //将两个控件添加到布局管理器中
    layout->addWidget(label);
    layout->addWidget(pushButton);
 
}

5. Set the sub-window docking position.

• Use the setAllowAreas(Qt::DockWidgetArea | Qt::DockWidgetArea) method to set the allowed docking location. The default is Qt::LeftDockWidgetArea - left.
• Four positions can be set, the default position is top:
• Qt::TopDockWidgetArea——上
• Qt::BottomDockWidgetArea——下
• Qt::LeftDockWidgetArea——左
• Qt::RightDockWidgetArea——右