PdfNavigationStack QML Type

History of the destinations visited within a PDF Document. 更多...

import 语句：	import QtQuick.Pdf 5.15
Since:	Qt 5.15

所有成员列表，包括继承成员

特性

currentLocation : point
currentPage : int
currentZoom : real

信号

jumped (int page , point location , qreal zoom )

方法

void back ()
void forward ()
void push (int page , point location , qreal zoom )
void update (int page , point location , qreal zoom )

详细描述

PdfNavigationStack remembers which destinations the user has visited in a PDF document, and provides the ability to traverse backward and forward.

特性文档编制

currentLocation : point

This property holds the current location on the page that is being viewed.

currentPage : int

This property holds the current page that is being viewed. If there is no current page, it holds -1 .

currentZoom : real

This property holds the magnification scale on the page that is being viewed.

信号文档编制

jumped ( int page , point location , qreal zoom )

此信号发射当 forward() , back() or push() is called, but not when update() 被调用。

注意： 相应处理程序是 onJumped .

方法文档编制

void back ()

Pops the stack, updates the currentPage , currentLocation and currentZoom properties to the most-recently-viewed destination, and then emits the jumped() 信号。

void forward ()

Goes back to the page, location and zoom level that was being viewed before back() was called, and then emits the jumped() 信号。

If a new destination was pushed since the last time back() was called, the forward() function does nothing, because there is a branch in the timeline which causes the "future" to be lost.

void push ( int page , point location , qreal zoom )

Adds the given destination, consisting of page , location and zoom , to the history of visited locations. If emitJumped is false ， jumped() signal will not be emitted.

If forwardAvailable is true , calling this function represents a branch in the timeline which causes the "future" to be lost, and therefore forwardAvailable will change to false .

void update ( int page , point location , qreal zoom )

Modifies the current destination, consisting of page , location and zoom .

This can be called periodically while the user is manually moving around the document, so that after back() is called, forward() will jump back to the most-recently-viewed destination rather than the destination that was last specified by push() .

The currentZoomChanged , currentPageChanged and currentLocationChanged signals will be emitted if the respective properties are actually changed. The jumped signal is not emitted, because this operation represents smooth movement rather than a navigational jump.