void QTreeView::resizeColumnToContents(int column)
// Resizes the column given to the size of its contents.
// 將指定列寬度適應現在的文字內容顯示。

 void QTreeView::setColumnWidth(int column, int width)
// Sets the width of the given column to the width specified.
// 設定指定列寬度。

void QStandardItemModel::setHorizontalHeaderLabels(const
 
 QStringList & labels)
// Sets the horizontal header labels using labels. 
// If necessary, the column count is increased to the size of labels.

void QStandardItemModel::clear();
// Removes all items (including header items) from the model 
// and sets the number of rows and columns to zero.
// 刪除所有資料，並且設定行列數為0
 
。

void QStandardItem::insertRow(int row, const QList<QStandardItem *> & items)
// Inserts a row at row containing items. 
// If necessary, the column count is increased to the size of items.
// 插入一條資料。

void QTreeView::setExpanded(const QModelIndex & index, bool expanded)
// Sets the item referred to by index to either collapse or expanded, 
 

// depending on the value of expanded.
// 設定index指定的項是摺疊的還是展開的。