Python 如何在urwid中创建嵌套列表框?
是否可以将列表框放在SimpleListWalker中?我正在尝试创建嵌套列表框,但出现以下错误:Python 如何在urwid中创建嵌套列表框?,python,listbox,nested,urwid,Python,Listbox,Nested,Urwid,是否可以将列表框放在SimpleListWalker中?我正在尝试创建嵌套列表框,但出现以下错误: AttributeError:“MyListBox”对象没有属性“行” import urwid class MyListBox(urwid.ListBox): def focus_next(self): try: self.body.set_focus(self.body.get_next(self.body.get_focus()[1])[1
AttributeError:“MyListBox”对象没有属性“行”
import urwid
class MyListBox(urwid.ListBox):
def focus_next(self):
try:
self.body.set_focus(self.body.get_next(self.body.get_focus()[1])[1])
except:
pass
def focus_previous(self):
try:
self.body.set_focus(self.body.get_prev(self.body.get_focus()[1])[1])
except:
pass
def handle_input(event):
frame.header.set_text("key pressed %s" % event)
if event == "q":
raise urwid.ExitMainLoop
elif event == "up":
lb.focus_previous()
elif event == "down" :
lb.focus_next()
widgets = [urwid.AttrMap(urwid.Text(str(x)),None,"focus") for x in xrange(3)]
nested = [urwid.AttrMap(urwid.Text(str(x)+"_sous"),None,"focus") for x in xrange(3)]
nested_lb = MyListBox(urwid.SimpleListWalker(nested))
lb = MyListBox(urwid.SimpleListWalker(widgets+[nested_lb]))
frame = urwid.Frame(lb,header=urwid.Text("Header"))
palette = [("focus","dark cyan","white")]
loop = urwid.MainLoop(frame,palette,unhandled_input = handle_input)
loop.screen.set_terminal_properties(colors=256)
loop.run()
根据ListBox
的说法,它是一个包含流小部件的框小部件
小部件类型(box、flow和fixed)之间的区别在于计算其大小的方法。上述链接中描述了详细信息。简而言之:ListBox
从其容器中得知其大小,但要求其子项自己计算其高度。由于另一个列表框
在其中,因此无法提供此值(没有行
方法)
解决方案是将内部的ListBox
包装在BoxAdapter
中,使box小部件的外观和行为与flow小部件类似:
...
widgets = [urwid.AttrMap(urwid.Text(str(x)),None,"focus") for x in xrange(3)]
nested = [urwid.AttrMap(urwid.Text(str(x)+"_sous"),None,"focus") for x in xrange(3)]
nested_lb = MyListBox(urwid.SimpleListWalker(nested))
lb = MyListBox(urwid.SimpleListWalker(widgets+[urwid.BoxAdapter(nested_lb, 10)]))
...