我想根据用户选择的通配符为用户提供不同的默认文件名。
似乎pyface.FileDialog继承自HasTraits所以我应该在上面观察它的wildcard_index特征以注意到变化并更新default_filename特征。
这是我的版本,
import pyface, traits, traitsui
pyface.__version__, traits.__version__, traitsui.__version__
('6.1.2', '5.1.2', '6.1.3')
EDM python环境
import sys
sys.version
'2.7.15 |Enthought, Inc. (x86_64)| (default, Jun 21 2018, 22:10:16) [MSC v.1500 64 bit (AMD64)]'
使用 WX 后端
import wx
wx.version()
'3.0.2.0 msw (classic)'
这是最简单的演示。的问题,
from pyface.api import FileDialog
from traits.api import on_trait_change
class MyFileDialog(FileDialog):
""" Subclass that allows the suggested file name to change based on the wildcard type.
"""
@on_trait_change('wildcard_index')
def on_wildcard_changed(self, idx):
# This is never called
self.default_filename = [
'filename_john',
'filename_paul',
'filename_george',
'filename_ringo'][idx]
if __name__ == '__main__':
types = ["*.a", "*.b", "*.c", "*.d"]
dialog = MyFileDialog(
action="save as",
wildcard="|".join(["%s|%s" % (t, t) for t in types]),
)
dialog.open()