Class MEditObserver

MEditObserver

Support

Supported from 6.0

Description

Specifies the mixin protocol for a rich text edit observer.

This class is implemented by controls which use a rich text (CRichText) object, when it is possible for the text object to be changed from outside of the control without the control's knowledge. An example is a CEikEdwin.

An edit observer is a callback to the control from the CRichText object which it has been set up to observe. The edit observer is set up using CRichText::SetEditObserver().

Defined in MEditObserver:
EditObserver()

virtual void EditObserver(TInt aStart, TInt aExtent) = 0;

Description

Observer function called by the CRichText object when the object is edited to give notification of changes to its text buffer. In this way, the control knows how the text object has changed and can reformat and redraw the text object appropriately.

A pointer to the observer object must have been passed in to a CRichText instance using CRichText::SetEditObserver().

Parameters

TInt aStart The start position of the edit. TInt aExtent The number of characters added or, if negative, deleted after this position.