QT qstackedwidget multi interface switching

sketch

QStackedWidget Inherited from QFrame.

QStackedWidget Class provides a layout for multi page switching , You can only see one interface at a time .

QStackedWidget Can be used to create similar QTabWidget The user interface provided .

 

• sketch
• Use
  • effect
  • Source code
• Interface
• The signal
• Common slot function
• summary

 

Use

One QStackedWidget You can use some sub pages to fill .

effect

Source code

QPushButton *pButton = new QPushButton(this);
QLabel *pFirstPage= new QLabel(this);
QLabel *pSecondPage = new QLabel(this);
QLabel *pThirdPage = new QLabel(this);
m_pStackedWidget = new QStackedWidget(this);

pButton->setText(QStringLiteral(" Click to switch "));
pFirstPage->setText(QStringLiteral(" One go, two three li "));
pSecondPage->setText(QStringLiteral(" Youth is not old , Struggle is more than ！"));
pThirdPage->setText(QStringLiteral(" The beauty of pure open source , Interesting 、 interesting 、 By spectrum ..."));

//  Add a page （ For switching ）
m_pStackedWidget->addWidget(pFirstPage);
m_pStackedWidget->addWidget(pSecondPage);
m_pStackedWidget->addWidget(pThirdPage);

QVBoxLayout *pLayout = new QVBoxLayout();
pLayout->addWidget(pButton, 0, Qt::AlignLeft | Qt::AlignVCenter);
pLayout->addWidget(m_pStackedWidget);
pLayout->setSpacing(10);
pLayout->setContentsMargins(10, 10, 10, 10);
setLayout(pLayout);

//  Connect the switch button signal to the slot 
connect(pButton, &QPushButton::clicked, this, &MainWindow::switchPage);

//  Switch pages 
void MainWindow::switchPage()
{
    int nCount = m_pStackedWidget->count();
    int nIndex = m_pStackedWidget->currentIndex();

    //  Get the index of the next page to be displayed 
    ++nIndex;

    //  When the page index to be displayed is greater than or equal to the total page , Switch to home page 
    if (nIndex >= nCount)
        nIndex = 0;

    m_pStackedWidget->setCurrentIndex(nIndex);
}

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Interface

• int addWidget(QWidget * widget)

  Add a page , And return the index corresponding to the page

• int count() const

  Get the number of pages

• int currentIndex() const

  Get the index of the current page

• QWidget * currentWidget() const

  Get the current page

• int indexOf(QWidget * widget) const

  obtain QWidget The index corresponding to the page

• int insertWidget(int index, QWidget * widget)

  In the index index Add page to location

• void removeWidget(QWidget * widget)

  remove QWidget page , Not deleted , Just move from the layout , So it's hidden .

• QWidget * widget(int index) const

  Get index index Corresponding page

The signal

• void currentChanged(int index)

  Launch when the current page changes ,index For the new index value

• void widgetRemoved(int index)

  Launch when the page is removed ,index The index value corresponding to the page

Common slot function

• void setCurrentIndex(int index)

  catalog index index The page is the current page

• void setCurrentWidget(QWidget * widget)

  Set up QWidget The page is the current page

summary

General situation , Two common ways ：

 

• 
  

• according to currentWidget() To determine the current page , And then through setCurrentWidget() To set the page to be displayed .

• according to currentIndex() To determine the current page index , And then through setCurrentIndex() To set the page to be displayed .