The QStackedLayout class provides a stack of widgets where only one widget is visible at a time. 更多...
继承 QLayout .
The QStackedLayout class provides a stack of widgets where only one widget is visible at a time.
QStackedLayout can be used to create a user interface similar to the one provided by QTabWidget . There is also a convenience QStackedWidget class built on top of QStackedLayout.
A QStackedLayout can be populated with a number of child widgets ("pages"). For example:
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);
QStackedLayout provides no intrinsic means for the user to switch page. This is typically done through a QComboBox 或 QListWidget that stores the titles of the QStackedLayout's pages. For example:
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)));
When populating a layout, the widgets are added to an internal list. The indexOf () function returns the index of a widget in that list. The widgets can either be added to the end of the list using the addWidget () function, or inserted at a given index using the insertWidget () 函数。 removeWidget () function removes the widget at the given index from the layout. The number of widgets contained in the layout, can be obtained using the count () 函数。
widget () function returns the widget at a given index position. The index of the widget that is shown on screen is given by currentIndex () and can be changed using setCurrentIndex (). In a similar manner, the currently shown widget can be retrieved using the currentWidget () function, and altered using the setCurrentWidget () 函数。
Whenever the current widget in the layout changes or a widget is removed from the layout, the currentChanged () 和 widgetRemoved () signals are emitted respectively.
This enum specifies how the layout handles its child widgets regarding their visibility.
| 常量 | 值 | 描述 |
|---|---|---|
| QStackedLayout.StackOne | 0 | Only the current widget is visible. This is the default. |
| QStackedLayout.StackAll | 1 | All widgets are visible. The current widget is merely raised. |
该枚举在 Qt 4.4 引入或被修改。
构造 QStackedLayout with no parent.
This QStackedLayout 必须是 installed on a widget later on to become effective.
另请参阅 addWidget () 和 insertWidget ().
parent argument, if not None, causes self to be owned by Qt instead of PyQt.
构造新 QStackedLayout with the given parent .
This layout will install itself on the parent widget and manage the geometry of its children.
parentLayout argument, if not None, causes self to be owned by Qt instead of PyQt.
构造新 QStackedLayout and inserts it into the given parentLayout .
item argument has it's ownership transferred to Qt.
重实现自 QLayout.addItem ().
添加给定 widget to the end of this layout and returns the index position of the widget .
若 QStackedLayout is empty before this function is called, the given widget becomes the current widget.
另请参阅 insertWidget (), removeWidget ()，和 setCurrentWidget ().
Returns the current widget, or 0 if there are no widgets in this layout.
另请参阅 currentIndex () 和 setCurrentWidget ().
Inserts the given widget at the given index in this QStackedLayout 。若 index is out of range, the widget is appended (in which case it is the actual index of the widget that is returned).
若 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.
另请参阅 addWidget (), removeWidget ()，和 setCurrentWidget ().
重实现自 QLayout.itemAt ().
重实现自 QLayoutItem.minimumSize ().
This method is also a Qt slot with the C++ signature void setCurrentIndex(int) .
This method is also a Qt slot with the C++ signature void setCurrentWidget(QWidget*) .
Sets the current widget to be the specified widget 。 new current widget must already be contained in this stacked layout.
另请参阅 setCurrentIndex () 和 currentWidget ().
重实现自 QLayoutItem.setGeometry ().
重实现自 QLayoutItem.sizeHint ().
QLayoutItem result
重实现自 QLayout.takeAt ().
返回 Widget 在给定 index , or 0 if there is no widget at the given position.
另请参阅 currentWidget () 和 indexOf ().
This is the default overload of this signal.
This signal is emitted whenever the current widget in the layout 改变。 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 )
另请参阅 currentWidget () 和 setCurrentWidget ().
This is the default overload of this signal.
This signal is emitted whenever a widget is removed from the layout. The widget's index is passed as parameter.
另请参阅 removeWidget ().