The QStackedWidget 類提供每次僅一 Widget 可見的小部件堆棧。 更多...
| 頭： | #include <QStackedWidget> |
| qmake: | QT += widgets |
| 繼承： | QFrame |
| QStackedWidget (QWidget * parent = Q_NULLPTR) | |
| ~QStackedWidget () | |
| int | addWidget (QWidget * widget ) |
| int | count () const |
| int | currentIndex () const |
| QWidget * | currentWidget () const |
| int | indexOf (QWidget * widget ) const |
| int | insertWidget (int index , QWidget * widget ) |
| void | removeWidget (QWidget * widget ) |
| QWidget * | widget (int index ) const |
| void | setCurrentIndex (int index ) |
| void | setCurrentWidget (QWidget * widget ) |
| void | currentChanged (int index ) |
| void | widgetRemoved (int index ) |
| virtual bool | event (QEvent * e ) |
The QStackedWidget 類提供每次僅一 Widget 可見的小部件堆棧。
QStackedWidget can be used to create a user interface similar to the one provided by QTabWidget 。它是方便布局 Widget，構建基於 QStackedLayout 類。
像 QStackedLayout , QStackedWidget can be constructed and populated with a number of child widgets ("pages"):
QWidget *firstPageWidget = new QWidget;
QWidget *secondPageWidget = new QWidget;
QWidget *thirdPageWidget = new QWidget;
QStackedWidget *stackedWidget = new QStackedWidget;
stackedWidget->addWidget(firstPageWidget);
stackedWidget->addWidget(secondPageWidget);
stackedWidget->addWidget(thirdPageWidget);
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(stackedWidget);
setLayout(layout);
QStackedWidget 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 QStackedWidget '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)),
stackedWidget, SLOT(setCurrentIndex(int)));
When populating a stacked widget, 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 () 函數。 removeWidget () function removes a widget from the stacked widget. The number of widgets contained in the stacked widget can be obtained using the count () 函數。
The 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 () 函數，和變更使用 setCurrentWidget () 函數。
Whenever the current widget in the stacked widget changes or a widget is removed from the stacked widget, the currentChanged () 和 widgetRemoved () signals are emitted respectively.
另請參閱 QStackedLayout , QTabWidget ，和 配置對話框範例 .
This property holds the number of widgets contained by this stacked widget
默認情況下，此特性包含 0 值。
訪問函數：
| int | count () const |
另請參閱 currentIndex () 和 widget ().
此特性保持可見 Widget 的索引位置
當前索引為 -1，若沒有當前 Widget。
By default, this property contains a value of -1 because the stack is initially empty.
訪問函數：
| int | currentIndex () const |
| void | setCurrentIndex (int index ) |
通知程序信號：
| void | currentChanged (int index ) |
另請參閱 currentWidget () 和 indexOf ().
構造 QStackedWidget 采用給定 parent .
另請參閱 addWidget () 和 insertWidget ().
Destroys this stacked widget, and frees any allocated resources.
Appends the given widget 到 QStackedWidget and returns the index position. Ownership of widget 被傳遞給 QStackedWidget .
若 QStackedWidget is empty before this function is called, widget becomes the current widget.
另請參閱 insertWidget (), removeWidget ()，和 setCurrentWidget ().
[signal]
void
QStackedWidget::
currentChanged
(
int
index
)
This signal is emitted whenever the current widget changes.
The parameter holds 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 QStackedWidget ).
注意： 通知程序信號對於特性 currentIndex .
另請參閱 currentWidget () 和 setCurrentWidget ().
Returns the current widget, or 0 if there are no child widgets.
另請參閱 currentIndex () 和 setCurrentWidget ().
[virtual protected]
bool
QStackedWidget::
event
(
QEvent
*
e
)
重實現自 QObject::event ().
返迴索引為給定 widget , or -1 if the given widget is not a child of the QStackedWidget .
另請參閱 currentIndex () 和 widget ().
插入給定 widget 在給定 index 在 QStackedWidget . Ownership of widget 被傳遞給 QStackedWidget 。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 QStackedWidget was 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.
另請參閱 addWidget (), removeWidget ()，和 setCurrentWidget ().
移除 widget 從 QStackedWidget . i.e., widget is not deleted but simply removed from the stacked layout, causing it to be hidden.
注意： Parent object and parent widget of widget will remain the QStackedWidget . If the application wants to reuse the removed widget , then it is recommended to re-parent it.
另請參閱 addWidget (), insertWidget ()，和 currentWidget ().
[slot]
void
QStackedWidget::
setCurrentWidget
(
QWidget
*
widget
)
Sets the current widget to be the specified widget . The new current widget must already be contained in this stacked widget.
另請參閱 currentWidget () 和 setCurrentIndex ().
返迴 Widget 按給定 index , or 0 if there is no such widget.
另請參閱 currentWidget () 和 indexOf ().
[signal]
void
QStackedWidget::
widgetRemoved
(
int
index
)
This signal is emitted whenever a widget is removed. The widget's index is passed as parameter.
另請參閱 removeWidget ().