Java SWT StyledText event to detect when the Control autoscrolls to show cursor position -

for rcp text editor styledtext used.

the styledtext background-image , text need scrolled @ once.

how can detected event of autocroll? if exists.

for example: if user press end_key , line in caret located is longer size of styledtext control area, control autoscrolls show caret position. same happeds if user press lef_arrow , cursor @ beggining of line , previous line has lenth greater control size.

so when autoscroll detected, listener can redrawn background accordingly.

up date solution found write listeners each event produced autoscroll. i.e. write events for:

st.addcaretlistener(new caretlistener (){...}; st.addlistener(swt.modify, new listener() {...}; ... st.addkeylistener(){...}; st.addmouselistener(){...};

so inside of each event write code paint background image. whith listener notified when controls scrolls itself, code shall more efficient.

thanks in advance