[英]configure_traits freezes console in Spyder/Anaconda
Trying the very first example in traitsui doc:尝试traitsui doc中的第一个例子:
from traits.api import HasTraits, Str, Int
from traitsui.api import View, Item
import traitsui
class SimpleEmployee(HasTraits):
first_name = Str
last_name = Str
department = Str
employee_number = Str
salary = Int
view1 = View(Item(name = 'first_name'),
Item(name = 'last_name'),
Item(name = 'department'))
sam = SimpleEmployee()
sam.configure_traits(view=view1)
makes the Spyder IPython console hang, even after the UI window has been closed.使 Spyder IPython 控制台挂起,即使在 UI 窗口关闭之后也是如此。
MacOSX 10.14.6, Spyder 4.0.0, Python 3.7.0, IPython 7.10.2, traitsui 6.1.3 MacOSX 10.14.6、Spyder 4.0.0、Python 3.7.0、IPython 7.10.2、traitsui 6.1.3
Probably something to configure about the UI event loop, but what and how ?可能需要配置一些关于 UI 事件循环的东西,但是什么以及如何配置?
The difference between the Canopy IPython console and the Spyder IPython console is that Canopy IPython 控制台和 Spyder IPython 控制台之间的区别在于
app = QtGui.QApplication.instance()
print(app)
returns返回
<PyQt5.QtWidgets.QApplication at 0xXXXXXXXX>
for both, but对于两者,但是
is_event_loop_running_qt4(app)
returns True
in Canopy IPython terminal and False
in Spyder IPython terminal.在 Canopy IPython 终端中返回
True
,在 Spyder IPython 终端中返回False
。
It is necessary to patch view_application()
in traits.qt4.view_application by commenting out the lines starting a new ViewApplication
instance depending on that test.这是必要的补丁
view_application()
在traits.qt4.view_application通过注释掉线开始一个新的ViewApplication
取决于测试实例。 Instead of changing the original file, it is possible to run the following code:可以运行以下代码,而不是更改原始文件:
# -*- coding: utf-8 -*-
"""Avoid Spyder console to hang when using configure_traits()
"""
from IPython import get_ipython
from pyface.qt import QtCore, QtGui, qt_api
from pyface.util.guisupport import is_event_loop_running_qt4
from traitsui.api import toolkit
from traitsui.qt4.view_application import ViewApplication
KEEP_ALIVE_UIS = set()
def on_ui_destroyed(object, name, old, destroyed):
""" Remove the UI object from KEEP_ALIVE_UIS.
"""
assert name == 'destroyed'
if destroyed:
assert object in KEEP_ALIVE_UIS
KEEP_ALIVE_UIS.remove(object)
object.on_trait_change(on_ui_destroyed, 'destroyed', remove=True)
def _view_application(context, view, kind, handler, id, scrollable, args):
""" Creates a stand-alone PyQt application to display a specified traits UI
View.
Parameters
----------
context : object or dictionary
A single object or a dictionary of string/object pairs, whose trait
attributes are to be edited. If not specified, the current object is
used.
view : view object
A View object that defines a user interface for editing trait attribute
values.
kind : string
The type of user interface window to create. See the
**traitsui.view.kind_trait** trait for values and
their meanings. If *kind* is unspecified or None, the **kind**
attribute of the View object is used.
handler : Handler object
A handler object used for event handling in the dialog box. If
None, the default handler for Traits UI is used.
scrollable : Boolean
Indicates whether the dialog box should be scrollable. When set to
True, scroll bars appear on the dialog box if it is not large enough
to display all of the items in the view at one time.
"""
if (kind == 'panel') or ((kind is None) and (view.kind == 'panel')):
kind = 'modal'
# !!!!!!! The following 4 lines commented out !!!!!!!!!!!
# app = QtGui.QApplication.instance()
# if app is None or not is_event_loop_running_qt4(app):
# return ViewApplication(context, view, kind, handler, id,
# scrollable, args).ui.result
# !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ui = view.ui(context,
kind=kind,
handler=handler,
id=id,
scrollable=scrollable,
args=args)
# If the UI has not been closed yet, we need to keep a reference to
# it until it does close.
if not ui.destroyed:
KEEP_ALIVE_UIS.add(ui)
ui.on_trait_change(on_ui_destroyed, 'destroyed')
return ui.result
def view_application(self, context, view, kind=None, handler=None,
id='', scrollable=None, args=None):
""" Creates a PyQt modal dialog user interface that
runs as a complete application, using information from the
specified View object.
Parameters
----------
context : object or dictionary
A single object or a dictionary of string/object pairs, whose trait
attributes are to be edited. If not specified, the current object is
used.
view : view or string
A View object that defines a user interface for editing trait
attribute values.
kind : string
The type of user interface window to create. See the
**traitsui.view.kind_trait** trait for values and
their meanings. If *kind* is unspecified or None, the **kind**
attribute of the View object is used.
handler : Handler object
A handler object used for event handling in the dialog box. If
None, the default handler for Traits UI is used.
id : string
A unique ID for persisting preferences about this user interface,
such as size and position. If not specified, no user preferences
are saved.
scrollable : Boolean
Indicates whether the dialog box should be scrollable. When set to
True, scroll bars appear on the dialog box if it is not large enough
to display all of the items in the view at one time.
"""
return _view_application(context, view, kind, handler,
id, scrollable, args)
from traitsui.qt4.toolkit import GUIToolkit
GUIToolkit.view_application = view_application
Thus, the behavior is OK in both Spyder and Canopy IPython consoles.因此,该行为在 Spyder 和 Canopy IPython 控制台中都正常。 Note that
configure_traits(kind='modal')
is also OK in both.请注意,
configure_traits(kind='modal')
在两者中也都可以。
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