Item of qtreewidget opened and String in Column adjusted in QT4??

[jpn]

(1) which will be used in qt4 to show items as opened when tree displayed.

• Qt 4.1: QTreeWidget::setItemExpanded()
• Qt 4.2: QTreeWidgetItem::setExpanded()

(2) How i can adjust column size of QTreeWidget in QT Designer or through coding,so that when i scroll the items appears in column adjusted according to their string size.

QHeaderView provides a bunch of methods for resizing sections, setting their resize modes, and properties like whether the last column is stretched or not and so on.. It is accessible through QTreeView::header().

(3) How I can show Horizontal scroll bar added to qtreewidget.

QAbstractScrollArea::setHorizontalScrollBarPolicy( )