QPlaceIcon Class

QPlaceIcon class represents an icon. 更多...

头：	#include <QPlaceIcon>
qmake:	QT += location
Since:	Qt 5.6

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公共函数

	QPlaceIcon ()
	QPlaceIcon (const QPlaceIcon & other )
	~QPlaceIcon ()
bool	isEmpty () const
QPlaceManager *	manager () const
QVariantMap	参数 () const
void	setManager (QPlaceManager * manager )
void	setParameters (const QVariantMap & 参数 )
QUrl	url (const QSize & size = QSize()) const
bool	operator!= (const QPlaceIcon & other ) const
QPlaceIcon &	operator= (const QPlaceIcon & other )
bool	operator== (const QPlaceIcon & other ) const

静态公共成员

const QString

SingleUrl

详细描述

QPlaceIcon class represents an icon.

The typical usage of an icon is to use the url () function to specify a preferred icon size.

QUrl iconSourceUrl = place.icon().url(QSize(32,32));
//A default icon may also be requested like so
iconSourceUrl = place.icon().url();

The icons are typically backend dependent, if a manager backend does not support a given size, the URL of the icon that most closely matches those parameters is returned.

The icon class also has a key-value set of parameters. The precise key one needs to use depends on the plugin being used. These parameters influence which icon URL is returned by the manager and may also be used to specify icon URL locations when saving icons.

If there is only ever one image for an icon, then QPlaceIcon::SingleUrl can be used as a parameter key with a QUrl as the associated value. If this key is set, then the url () function will always return the specified URL and not defer to any manager.

成员函数文档编制

QPlaceIcon:: QPlaceIcon ()

Constructs an icon.

QPlaceIcon:: QPlaceIcon (const QPlaceIcon & other )

构造副本为 other .

QPlaceIcon:: ~QPlaceIcon ()

销毁图标。

bool QPlaceIcon:: isEmpty () const

Returns a boolean indicating whether the all the fields of the icon are empty or not.

QPlaceManager *QPlaceIcon:: manager () const

Returns the manager that this icon is associated with.

另请参阅 setManager ().

QVariantMap QPlaceIcon:: 参数 () const

Returns a set of parameters for the icon that are manager/plugin specific. These parameters are used by the manager to return the appropriate URL when url () is called and to specify locations to save to when saving icons.

Consult the plugin documentation for what parameters are supported and how they should be used.

另请参阅 setParameters ().

void QPlaceIcon:: setManager ( QPlaceManager * manager )

设置 manager that this icon is associated with. The icon does not take ownership of the pointer.

另请参阅 manager ().

void QPlaceIcon:: setParameters (const QVariantMap & 参数 )

Sets the parameters of the icon to 参数 .

另请参阅 参数 ().

QUrl QPlaceIcon:: url (const QSize & size = QSize()) const

Returns an icon URL according to the given size .

If no manager has been assigned to the icon, and the parameters do not contain the QPlaceIcon::SingleUrl key, a default constructed QUrl 被返回。

bool QPlaceIcon:: operator!= (const QPlaceIcon & other ) const

返回 true 若 other is not equal to this icon, otherwise returns false.

QPlaceIcon &QPlaceIcon:: operator= (const QPlaceIcon & other )

赋值 other to this icon and returns a reference to this icon.

bool QPlaceIcon:: operator== (const QPlaceIcon & other ) const

Returns true if this icon is equal to other ，否则返回 false。

成员变量文档编制

const QString QPlaceIcon:: SingleUrl

Parameter key for an icon that only has a single image URL.

The parameter value to be used with this key is a QUrl . An icon with this parameter set will always return the specified URL regardless of the requested size when url () 被调用。