The Q3WidgetStack class provides a stack of widgets of which only the top widget is user-visible. 更多...
| 头： | #include <Q3WidgetStack> |
| 继承： | Q3Frame |
| Q3WidgetStack (QWidget * parent , const char * name = 0, Qt::WindowFlags f = 0) | |
| ~Q3WidgetStack () | |
| int | addWidget (QWidget * w , int id = -1) |
| int | id (QWidget * widget ) const |
| void | removeWidget (QWidget * w ) |
| QWidget * | visibleWidget () const |
| QWidget * | widget (int id ) const |
| virtual QSize | minimumSizeHint () const |
| virtual void | setVisible (bool visible ) |
| virtual QSize | sizeHint () const |
| void | raiseWidget (int id ) |
| void | raiseWidget (QWidget * w ) |
| void | aboutToShow (int id ) |
| void | aboutToShow (QWidget * widget ) |
| virtual void | setChildGeometries () |
| virtual void | childEvent (QChildEvent * e ) |
| virtual bool | event (QEvent * e ) |
| virtual void | frameChanged () |
| virtual void | resizeEvent (QResizeEvent * e ) |
The Q3WidgetStack class provides a stack of widgets of which only the top widget is user-visible.
The application programmer can move any widget to the top of the stack at any time using raiseWidget (), and add or remove widgets using addWidget () 和 removeWidget (). It is not sufficient to pass the widget stack as parent to a widget which should be inserted into the widgetstack.
visibleWidget () is the get 相当于 raiseWidget (); it returns a pointer to the widget that is currently at the top of the stack.
Q3WidgetStack also provides the ability to manipulate widgets through application-specified integer IDs. You can also translate from widget pointers to IDs using id () and from IDs to widget pointers using widget (). These numeric IDs are unique (per Q3WidgetStack , not globally), but Q3WidgetStack does not attach any additional meaning to them.
The default widget stack is frameless, but you can use the usual Q3Frame functions (such as setFrameStyle ()) to add a frame.
Q3WidgetStack provides a signal, aboutToShow (), which is emitted just before a managed widget is shown.
另请参阅 Q3TabDialog , QTabWidget , QTabBar ，和 Q3Frame .
Constructs an empty widget stack.
The parent , name and f 自变量被传递给 Q3Frame 构造函数。
销毁对象并释放任何分配资源。
[signal]
void
Q3WidgetStack::
aboutToShow
(
int
id
)
This signal is emitted just before a managed widget is shown if that managed widget has an ID != -1. The id parameter is the numeric ID of the widget.
若调用 visibleWidget () in a slot connected to aboutToShow(), the widget it returns is the one that is currently visible, not the one that is about to be shown.
注意： 信号 aboutToShow 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：
connect(3WidgetStack, static_cast<void(Q3WidgetStack::*)(int)>(&Q3WidgetStack::aboutToShow), [=](int id){ /* ... */ });
[signal]
void
Q3WidgetStack::
aboutToShow
(
QWidget
*
widget
)
这是重载函数。
This signal is emitted just before a managed widget is shown. The argument is a pointer to the widget .
若调用 visibleWidget () in a slot connected to aboutToShow (), the widget returned is the one that is currently visible, not the one that is about to be shown.
注意： 信号 aboutToShow 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：
connect(3WidgetStack, static_cast<void(Q3WidgetStack::*)(QWidget *)>(&Q3WidgetStack::aboutToShow), [=](QWidget *widget){ /* ... */ });
添加 Widget w to this stack of widgets, with ID id .
If you pass an id >= 0 this ID is used. If you pass an id of -1 (the default), the widgets will be numbered automatically. If you pass -2 a unique negative integer will be generated. No widget has an ID of -1. Returns the ID or -1 on failure (e.g. w is 0).
If you pass an id that is already used, then a unique negative integer will be generated to prevent two widgets having the same id.
若 w already exists in the stack the widget will be removed first.
若 w is not a child of this Q3WidgetStack moves it using reparent ().
[virtual protected]
void
Q3WidgetStack::
childEvent
(
QChildEvent
*
e
)
重实现自 QObject::childEvent ().
[virtual protected]
bool
Q3WidgetStack::
event
(
QEvent
*
e
)
重实现自 QObject::event ().
[virtual protected]
void
Q3WidgetStack::
frameChanged
()
重实现自 Q3Frame::frameChanged ().
Returns the ID of the widget . Returns -1 if widget is 0 or is not being managed by this widget stack.
另请参阅 widget () 和 addWidget ().
[虚拟]
QSize
Q3WidgetStack::
minimumSizeHint
() const
重实现自 QWidget::minimumSizeHint ().
[slot]
void
Q3WidgetStack::
raiseWidget
(
int
id
)
Raises the widget with ID id to the top of the widget stack.
另请参阅 visibleWidget ().
[slot]
void
Q3WidgetStack::
raiseWidget
(
QWidget
*
w
)
这是重载函数。
Raises widget w to the top of the widget stack.
Removes widget w from this stack of widgets. Does not delete w 。若 w is the currently visible widget, no other widget is substituted.
另请参阅 visibleWidget () 和 raiseWidget ().
[virtual protected]
void
Q3WidgetStack::
resizeEvent
(
QResizeEvent
*
e
)
重实现自 QWidget::resizeEvent ().
[virtual protected]
void
Q3WidgetStack::
setChildGeometries
()
Fixes up the children's geometries.
[虚拟]
void
Q3WidgetStack::
setVisible
(
bool
visible
)
重实现自 QWidget::setVisible ().
[虚拟]
QSize
Q3WidgetStack::
sizeHint
() const
重实现自 QWidget::sizeHint ().
Returns the currently visible widget (the one at the top of the stack), or 0 if nothing is currently being shown.
另请参阅 aboutToShow (), id ()，和 raiseWidget ().
Returns the widget with ID id . Returns 0 if this widget stack does not manage a widget with ID id .