QStackedLayout Class

      QWidget *firstPageWidget = new QWidget;
      QWidget *secondPageWidget = new QWidget;
      QWidget *thirdPageWidget = new QWidget;

      QStackedLayout *stackedLayout = new QStackedLayout;
      stackedLayout->addWidget(firstPageWidget);
      stackedLayout->addWidget(secondPageWidget);
      stackedLayout->addWidget(thirdPageWidget);

      QVBoxLayout *mainLayout = new QVBoxLayout;
      mainLayout->addLayout(stackedLayout);
      setLayout(mainLayout);

      QComboBox *pageComboBox = new QComboBox;
      pageComboBox->addItem(tr("Page 1"));
      pageComboBox->addItem(tr("Page 2"));
      pageComboBox->addItem(tr("Page 3"));
      connect(pageComboBox, SIGNAL(activated(int)),
              stackedLayout, SLOT(setCurrentIndex(int)));

成员函数

QStackedLayout::QStackedLayout()

Constructs a QStackedLayout with no parent.

This QStackedLayout must be installed on a widget later on to become effective.

参见 addWidget() and insertWidget().

QStackedLayout::QStackedLayout(QWidget *parent)

Constructs a new QStackedLayout with the given parent.

This layout will install itself on the parent widget and manage the geometry of its children.

QStackedLayout::QStackedLayout(QLayout *parentLayout)

Constructs a new QStackedLayout and inserts it into the given parentLayout.

QStackedLayout::~QStackedLayout()

Destroys this QStackedLayout. Note that the layout's widgets are not destroyed.

[virtual] void QStackedLayout::addItem(QLayoutItem *item)

重新实现 QLayout::addItem().

int QStackedLayout::addWidget(QWidget *widget)

Adds the given widget to the end of this layout and returns the index position of the widget.

If the QStackedLayout is empty before this function is called, the given widget becomes the current widget.

参见 insertWidget(), removeWidget(), and setCurrentWidget().

[signal] void QStackedLayout::currentChanged(int index)

This signal is emitted whenever the current widget in the layout changes. The index specifies the index of the new current widget, or -1 if there isn't a new one (for example, if there are no widgets in the QStackedLayout)

Note: Notifier signal for property currentIndex.

参见 currentWidget() and setCurrentWidget().

QWidget *QStackedLayout::currentWidget() const

Returns the current widget, or 0 if there are no widgets in this layout.

参见 currentIndex() and setCurrentWidget().

[virtual] bool QStackedLayout::hasHeightForWidth() const

重新实现 QLayoutItem::hasHeightForWidth().

[virtual] int QStackedLayout::heightForWidth(int width) const

重新实现 QLayoutItem::heightForWidth().

int QStackedLayout::insertWidget(int index, QWidget *widget)

Inserts the given widget at the given index in this QStackedLayout. If index is out of range, the widget is appended (in which case it is the actual index of the widget that is returned).

If the QStackedLayout is empty before this function is called, the given widget becomes the current widget.

Inserting a new widget at an index less than or equal to the current index will increment the current index, but keep the current widget.

参见 addWidget(), removeWidget(), and setCurrentWidget().

[virtual] QLayoutItem *QStackedLayout::itemAt(int index) const

重新实现 QLayout::itemAt().

[virtual] QSize QStackedLayout::minimumSize() const

重新实现 QLayoutItem::minimumSize().

[slot] void QStackedLayout::setCurrentWidget(QWidget *widget)

Sets the current widget to be the specified widget. The new current widget must already be contained in this stacked layout.

参见 setCurrentIndex() and currentWidget().

[virtual] void QStackedLayout::setGeometry(const QRect &rect)

重新实现 QLayoutItem::setGeometry().

[virtual] QSize QStackedLayout::sizeHint() const

重新实现 QLayoutItem::sizeHint().

[virtual] QLayoutItem *QStackedLayout::takeAt(int index)

重新实现 QLayout::takeAt().

QWidget *QStackedLayout::widget(int index) const

Returns the widget at the given index, or 0 if there is no widget at the given position.

参见 currentWidget() and indexOf().

[signal] void QStackedLayout::widgetRemoved(int index)

This signal is emitted whenever a widget is removed from the layout. The widget's index is passed as parameter.

参见 removeWidget().