是否有针对焦点的TextInput的焦点丢失事件分配器？

Question

问题：

如果multiline = True TextInput失去焦点，是否可以触发事件？

背景：

我尝试了on_touch_up函数。但是它返回我所有TextInputs的实例，而不仅仅是当前的小部件。我尝试了text_validate_unfocus = False，但结果相同。

代码：

import kivy
kivy.require("1.10.1")

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import ObjectProperty, NumericProperty
from kivy.uix.textinput import TextInput
from kivy.uix.bubble import Bubble
from kivy.lang import Builder
from kivy.storage.jsonstore import JsonStore

Builder.load_string('''
#: import Window kivy.core.window.Window
<Button>:
    background_normal: ''
<Label>:
    canvas.before:
        Color:
            rgba: (0,0.59,0.36,1)
        Rectangle:
            pos: self.pos
            size: self.size
<TextInput>:
    hint_text: 'Nuwe nota'
    font_size: self.height / 4.5 if self.focus else self.height / 3
    background_normal: ''
    background_active: ''
    foreground_color: (0,0.61,0.36,1) if self.focus else (0.71,0.75,0.71,1)
    unfocus_on_touch: False
    canvas.after:
        Color:
            rgb: (0,0,0,1)
        Line:
            points: self.pos[0] , self.pos[1], self.pos[0] + self.size[0], self.pos[1]
    size_hint_y: None
    height: Window.height / 6 if self.focus else Window.height / 12
<ChoiceBubble>:
    orientation: 'horizontal'
    size_hint: (None, None)
    size: (160, 120)
    pos_hint: {'top': 0.2, 'right': 0.8}
    arrow_pos: 'top_left'
    BubbleButton:
        text: 'Save'
    BubbleButton:
        text: 'Encrypt..'
    BubbleButton:
        text: 'Delete'
        on_release: root.del_txt_input()
<Notation>:
    canvas:
        Color:
            rgba: (0,0.43,0.37,1)
        Rectangle:
            pos: self.pos
            size: self.size
    Label:
        pos_hint: {'top': 1, 'right': 0.8}
        size_hint: [0.8, None]
        height: Window.height / 15
    Button:
        color: (0,0,0,1)
        pos_hint: {'top': 1, 'right': 0.9}
        size_hint: [0.1, None]
        height: Window.height / 15
        Image:
            source: 'gear_2.png'
            center_y: self.parent.center_y
            center_x: self.parent.center_x
            size: self.parent.width /1.5, self.parent.height/ 1.5
            allow_stretch: True
    Button:
        color: (0,0,0,1)
        pos_hint: {'top': 1, 'right': 1}
        size_hint: [0.1, None]
        height: Window.height / 15
        on_release: root.add_input()
        Image:
            source: 'plus_text12354.png'
            center_y: self.parent.center_y
            center_x: self.parent.center_x
            size: self.parent.width /1.5, self.parent.height/ 1.5
            allow_stretch: True
    ScrollView:
        size_hint_y: None
        size: Window.width, Window.height
        pos_hint: {'top': 0.92, 'right': 1}
        GridLayout:
            id: text_holder
            cols: 1
            pos_hint: {'top': 0.92, 'right': 1}
            padding: 4
            size_hint_x: 1
            size_hint_y: None
            height: self.minimum_height

''')
class ChoiceBubble(Bubble):
    pass
class TextInput(TextInput):
    got_txt = ObjectProperty(None)
    def on_touch_up(self, touch):
        if not self.collide_point(*touch.pos):
            self.text_validate_unfocus = False
            note = Notation()
            note.show_bubble
            self.got_txt=note.que_txt_input(self)
        return super(TextInput, self).on_touch_up(touch)
class Notation(FloatLayout):
    which_txt = ObjectProperty(None)
    new_txt = ObjectProperty(None)
    cnt = NumericProperty(0)
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.the_file=JsonStore('txt_input.json')
        self.cnt = self.the_file.count()
        lst = self.the_file.keys
    def add_input(self):
        txt_hld = self.ids.text_holder
        self.cnt += 1
        self.new_txt = TextInput(id=str(self.cnt))
        self.the_file.put(str(self.cnt), the_id=str(self.cnt), the_input='')
        txt_hld.add_widget(self.new_txt)
    def que_txt_input(self, instance):
        self.which_txt = instance
        print(instance.text, instance)
        return instance
    def del_txt_input(self):
        print(self.which_txt)
    def the_file(self, notestore):
        self.notestore = notestore
    def show_bubble(self):
        self.add_widget(ChoiceBubble())
    def get_store(self):
        the_keys = list(self.the_file.keys)
        print(the_keys)
        return the_keys

class theNoteApp(App):
    title = 'My Notes'
    def build(self):
        return Notation()

if __name__ == '__main__':
    theNoteApp().run()

所需结果：

失去焦点后，我想在我的widget的顶部添加一个气泡root class。这样，用户可以选择将TextInput id和刚刚失去焦点的文本保存，加密或删除到JSON文件中。

Answer 1

问题

1. 对象Notation的多个实例。 build()类中的return Notation()方法（App）中的一个，每当on_touch_up()事件被触发时，另一个由note = Notation()方法（on_touch_up）中创建的实例。用on_touch_up()方法创建的实例没有可见的视图，即不会显示在窗口中。
2. AttributeError: 'ChoiceBubble' object has no attribute 'del_txt_input'
3. ChoiceBubble中的文本不可见，即默认的文本颜色是白色背景上的白色。

解决方案

1. 使用App.get_running_app().root获取实例化的根。
2. 将root.del_txt_input()替换为app.root.del_txt_input()
3. 将color: 0, 0, 0, 1添加到类别规则<Label>:
4. 使用on_focus事件显示BubbleButton

摘要-kv

<Label>:
    color: 0, 0, 0, 1
    ...

<ChoiceBubble>:
    ...
    BubbleButton:
        text: 'Delete'
        on_release: app.root.del_txt_input()

代码段-py文件

class TextInput(TextInput):
    got_txt = ObjectProperty(None)

    def on_focus(self, instance, value):
        if not value:   # defocused
            note = App.get_running_app().root
            note.show_bubble()
            self.got_txt = note.que_txt_input(self)

输出

Answer 2

焦点布尔值更改时，将触发on_focus事件。

  

我尝试了on_touch_up函数。但是它返回我所有TextInput的实例，而不仅仅是当前的小部件。

这是因为您没有编写任何代码来将其限制为您关注的窗口小部件，因此可以根据需要执行此操作。