內容

• 公共函數
• 靜態公共成員
• 詳細描述

Q3WhatsThis Class

頭：	#include <Q3WhatsThis>
繼承：	QObject

• 所有成員列錶，包括繼承成員

公共函數

	Q3WhatsThis (QWidget * widget )
	~Q3WhatsThis ()
virtual bool	clicked (const QString & href )
virtual QString	text (const QPoint & pos )

• 29 公共函數繼承自 QObject

靜態公共成員

void	add (QWidget * widget , const QString & text )
void	display (const QString & text , const QPoint & pos = QCursor::pos(), QWidget * widget = 0)
void	enterWhatsThisMode ()
bool	inWhatsThisMode ()
void	leaveWhatsThisMode (const QString & text = QString(), const QPoint & pos = QCursor::pos(), QWidget * widget = 0)
void	remove (QWidget * widget )
QToolButton *	whatsThisButton (QWidget * parent )

• 7 靜態公共成員繼承自 QObject

額外繼承成員

• 1 特性繼承自 QObject
• 1 公共槽繼承自 QObject
• 1 信號繼承自 QObject
• 8 保護函數繼承自 QObject

詳細描述

成員函數文檔編製

Q3WhatsThis:: Q3WhatsThis ( QWidget * widget )

Constructs a new "What's This?" object for widget .

Q3WhatsThis:: ~Q3WhatsThis ()

Destroys the "What's This?" object.

[static] void Q3WhatsThis:: add ( QWidget * widget , const QString & text )

添加 text as "What's This?" help for widget . If the text is rich text formatted (i.e. it contains markup) it will be rendered with the default stylesheet QStyleSheet::defaultSheet().

The text is destroyed if the widget is later destroyed, so it need not be explicitly removed.

另請參閱 remove ().

[虛擬] bool Q3WhatsThis:: clicked (const QString & href )

This virtual function is called when the user clicks inside the "What's this?" window. href is the link the user clicked on, or an empty string if there was no link.

If the function returns true (the default), the "What's this?" window is closed, otherwise it remains visible.

The default implementation ignores href and returns true.

[static] void Q3WhatsThis:: display (const QString & text , const QPoint & pos = QCursor::pos(), QWidget * widget = 0)

顯示 text in a help window at the global screen position pos .

If widget widget is not 0 and has its own dedicated QWhatsThis object, this object will receive clicked () messages when the user clicks on hyperlinks inside the help text.

另請參閱 clicked ().

[static] void Q3WhatsThis:: enterWhatsThisMode ()

Enters "What's This?" mode and returns immediately.

Qt will install a special cursor and take over mouse input until the user clicks somewhere. It then shows any help available and ends "What's This?" mode. Finally, Qt removes the special cursor and help window and then restores ordinary event processing, at which point the left mouse button is no longer pressed.

The user can also use the Esc key to leave "What's This?" mode.

另請參閱 inWhatsThisMode () 和 leaveWhatsThisMode ().

[static] bool Q3WhatsThis:: inWhatsThisMode ()

Returns true if the application is in "What's This?" mode; otherwise returns false.

另請參閱 enterWhatsThisMode () 和 leaveWhatsThisMode ().

[static] void Q3WhatsThis:: leaveWhatsThisMode (const QString & text = QString(), const QPoint & pos = QCursor::pos(), QWidget * widget = 0)

This function is used internally by widgets that support QWidget::customWhatsThis(); applications do not usually call it. An example of such a widget is Q3PopupMenu : menus still work normally in "What's This?" mode but also provide help texts for individual menu items.

若 text is not empty, a "What's This?" help window is displayed at the global screen position pos . If widget widget is not 0 and has its own dedicated QWhatsThis object, this object will receive clicked () messages when the user clicks on hyperlinks inside the help text.

另請參閱 inWhatsThisMode (), enterWhatsThisMode ()，和 clicked ().

[static] void Q3WhatsThis:: remove ( QWidget * widget )

Removes the "What's This?" help associated with the widget . This happens automatically if the widget is destroyed.

另請參閱 add ().

[虛擬] QString Q3WhatsThis:: text (const QPoint & pos )

This virtual function returns the text for position pos in the widget that this "What's This?" object documents. If there is no "What's This?" text for the position, an empty string is returned.

The default implementation returns an empty string.

[static] QToolButton * Q3WhatsThis:: whatsThisButton ( QWidget * parent )

創建 QToolButton preconfigured to enter "What's This?" mode when clicked. You will often use this with a tool bar as parent :

(void)Q3WhatsThis::whatsThisButton( my_help_tool_bar );