Thank you, Salvatore Larosa.
I read the link you give, it looks like build a PyQGIS applications
( Without QGIS Application ).
Although I just want to build a Qgis plugin using python ( Within
QGIS Application ),
I learn "the legend" ( like qgis.utils.iface.legendInterface() ) is a
kind of QTreeWidget.
It can process layers ( eg. QTreeWidgetItem or QgsLegendModel ??).
But I still not found using API to collapse/expand a layer or get legend
object.
I Think If I can get QGIS application's legend object,
I can use the QTreeWidget's method collapseItem/expandItem to get what I
want (Maybe...).
I will try my best and thank you again.
KSJ
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