traitsui阻止txt-box实时更新 [英] traitsui prevent txt-box from realtime updating

问题描述

经常使用traitsui时，我有一个depends_on关系，该关系有些昂贵，并且我会不使用文本框的每个字符输入都不更新该特征.

Frequently when using traitsui, i have a depends_on relationships that are somewhat costly, and i would to Not update the trait with every character entry of a text-box.

例如，如果我有一个用于计算的Int，则通过depends_on链接，每当我向Int添加一个数字时，该链接便被激活.

For example, if i have a Int which is used in a calculation, through depends_on linkage, the linkage is actuated every time i add a digit to Int.

目前，我通过使用按钮来规避此问题，但我是否对是否有一种方法可以推迟更新所有内容直到用户点击enter或更改UI的焦点感到好奇.

currently i circumvent this by using buttons, but am curious if there is there a way to defer updating everything until the user hits enter or changes focus of the UI.

谢谢

alex

推荐答案

您只需要将要创建的几个关键字参数auto_set和enter_set指定给TextEditor，以便小部件知道何时需要评估您的价值.这是一个实现惰性小部件的示例:

You simply need to specify to the TextEditor you are creating a couple of keyword arguments auto_set and enter_set so that the widget knows when it needs to evaluate your value. Here would be an example implementing a lazy widget:

from traits.api import HasTraits, Int
from traitsui.api import TextEditor, View, Item

class LazyEval(HasTraits):
    a = Int
    # Additional 'evaluate' is needed to make an int from a string
    view = View(Item("a", editor=TextEditor(auto_set=False, enter_set=True, 
                                            evaluate=int))) 

    def _a_changed(self):
        print "New value of a is %s" % self.a


l = LazyEval()
l.configure_traits()

此代码将仅在您按Enter时打印一个值.如果删除了auto_set和enter_set，它将在每次击键时将其打印出来.有关更多详细信息: http://docs.enthought.com/traitsui/traitsui_user_man_manual/factories_basic .html#texteditor

This code will print values for a only when you hit enter now. If you removed auto_set and enter_set, it would print it on every keystroke. For more details: http://docs.enthought.com/traitsui/traitsui_user_manual/factories_basic.html#texteditor

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