python - 如何扩展顶级QTreeview项目

Question

我不明白为什么这似乎没有扩展 QTreeView 中的顶级根项:

# clear existing treeview data
model = self.treeview.model().sourceModel()
model.clear()

# add treeview items here

# expand root level items
root = model.invisibleRootItem()
index = root.index()
for i in range(root.rowCount()):
    item = model.indexFromItem(model.item(i,0))
    self.treeview.expand(item)
    self.treeview.setExpanded(item, True)
    print 'expanded'

Answer 1

如果您使用代理模型，则必须使用它提供的索引，而不是源模型中的索引。所以要么这样做:

proxy = self.treeview.model()

for row in range(proxy.rowCount()):
    index = proxy.index(row, 0)
    self.treeview.expand(index)

或者这个:

proxy = self.treeview.model()
model = proxy.sourceModel()    

for row in range(model.rowCount()):
    index = model.index(row, 0)
    self.treeview.expand(proxy.mapFromSource(index))