QStackedLayout class provides a stack of widgets where only one widget is visible at a time. 更多...
| 头： | #include <QStackedLayout> |
| qmake: | QT += widgets |
| 继承： | QLayout |
| enum | StackingMode { StackOne, StackAll } |
| QStackedLayout () | |
| QStackedLayout (QWidget * parent ) | |
| QStackedLayout (QLayout * parentLayout ) | |
| ~QStackedLayout () | |
| int | addWidget (QWidget * widget ) |
| int | currentIndex () const |
| QWidget * | currentWidget () const |
| int | insertWidget (int index , QWidget * widget ) |
| void | setStackingMode (StackingMode stackingMode ) |
| StackingMode | stackingMode () const |
| QWidget * | widget (int index ) const |
| virtual void | addItem (QLayoutItem * item ) |
| virtual int | count () const |
| virtual bool | hasHeightForWidth () const |
| virtual int | heightForWidth (int width ) const |
| virtual QLayoutItem * | itemAt (int index ) const |
| virtual QSize | minimumSize () const |
| virtual void | setGeometry (const QRect & rect ) |
| virtual QSize | sizeHint () const |
| virtual QLayoutItem * | takeAt (int index ) |
| void | setCurrentIndex (int index ) |
| void | setCurrentWidget (QWidget * widget ) |
| void | currentChanged (int index ) |
| void | widgetRemoved (int index ) |
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 。还有方便 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)));
当填充布局时，Widget 会被添加到内部列表中。 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 () 函数，和变更使用 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.
另请参阅 QStackedWidget and QTabWidget .
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。
This property holds the number of widgets contained in the layout
访问函数：
| virtual int | count () const |
另请参阅 currentIndex () 和 widget ().
此特性保持可见 Widget 的索引位置
当前索引为 -1，若没有当前 Widget。
访问函数：
| int | currentIndex () const |
| void | setCurrentIndex (int index ) |
通知程序信号：
| void | currentChanged (int index ) |
另请参阅 currentWidget () 和 indexOf ().
determines the way visibility of child widgets are handled.
默认值为 StackOne . Setting the property to StackAll allows you to make use of the layout for overlay widgets that do additional drawing on top of other widgets, for example, graphical editors.
该特性在 Qt 4.4 引入。
访问函数：
| StackingMode | stackingMode () const |
| void | setStackingMode (StackingMode stackingMode ) |
构造 QStackedLayout with no parent.
This QStackedLayout must be installed on a widget later on to become effective.
另请参阅 addWidget () 和 insertWidget ().
构造新的 QStackedLayout 采用给定 parent .
This layout will install itself on the parent widget and manage the geometry of its children.
构造新的 QStackedLayout 并将其插入给定 parentLayout .
销毁此 QStackedLayout . Note that the layout's widgets are not destroyed.
[virtual]
void
QStackedLayout::
addItem
(
QLayoutItem
*
item
)
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 ().
[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 )
注意： 通知程序信号对于特性 currentIndex .
另请参阅 currentWidget () 和 setCurrentWidget ().
Returns the current widget, or 0 if there are no widgets in this layout.
另请参阅 currentIndex () 和 setCurrentWidget ().
[virtual]
bool
QStackedLayout::
hasHeightForWidth
() const
重实现自 QLayoutItem::hasHeightForWidth ().
[virtual]
int
QStackedLayout::
heightForWidth
(
int
width
) const
重实现自 QLayoutItem::heightForWidth ().
插入给定 widget 在给定 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 ().
[virtual]
QLayoutItem
*QStackedLayout::
itemAt
(
int
index
) const
重实现自 QLayout::itemAt ().
[virtual]
QSize
QStackedLayout::
minimumSize
() const
重实现自 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.
另请参阅 setCurrentIndex () 和 currentWidget ().
[virtual]
void
QStackedLayout::
setGeometry
(const
QRect
&
rect
)
重实现自 QLayoutItem::setGeometry ().
[virtual]
QSize
QStackedLayout::
sizeHint
() const
重实现自 QLayoutItem::sizeHint ().
[virtual]
QLayoutItem
*QStackedLayout::
takeAt
(
int
index
)
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 ().
[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.
另请参阅 removeWidget ().