问题描述

如果 multiline = True TextInput 失去焦点，有没有办法触发事件?

Is there a way to fire an event if a multiline = True TextInput lost its focus?

我已经尝试过 on_touch_up 功能.但它会返回我所有的 TextInputs 的实例，而不仅仅是当前的小部件.我尝试了 text_validate_unfocus = False，结果相同.

I have tried on_touch_up function. But it returns the instances of all my TextInputs, not just the current widget. I tried text_validate_unfocus = False, with the same result.

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()

期望的结果:

一旦失去焦点，我希望将气泡 widget 添加到我的 root class 的顶部.这将使用户可以选择将刚刚失去焦点的 TextInput id 和文本保存、加密或删除到 JSON 文件中.

Desired Result:

Once the focus is lost I want a bubble widget to be added to the top of my root class. This will give the user the option to save, encrypt or delete the TextInput id and text that just lost its focus, to a JSON file.

推荐答案

问题

1. 对象的多个实例，Notation.一个来自 App 类中的 build() 方法(return Notation())，另一个实例是在 on_touch_up()on_touch_up 事件被触发时，code> 方法 (note = Notation()).在 on_touch_up() 方法中创建的那些实例没有可见视图，即它不会显示在窗口中.
2. AttributeError: 'ChoiceBubble' 对象没有属性 'del_txt_input'
3. ChoiceBubble 中的文本不可见，即默认文本颜色为白底白字.

1. Multiple instances of object, Notation. One from build() method (return Notation()) in App class, and another instance created in on_touch_up() method (note = Notation()) whenever on_touch_up event is fired. Those instances created in on_touch_up() method does not has a visible view i.e. it won't show up in the window.
2. AttributeError: 'ChoiceBubble' object has no attribute 'del_txt_input'
3. Text in ChoiceBubble not visible i.e. the default text color is white on white background.

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. 在类规则中添加color: 0, 0, 0, 1，<Label>:
4. 使用on_focus事件显示BubbleButton

1. Use App.get_running_app().root to get the instantiated root.
2. Replace root.del_txt_input() with app.root.del_txt_input()
3. Add color: 0, 0, 0, 1 to class rule, <Label>:
4. Use on_focus event to display BubbleButton

片段 - kv

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

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

片段 - 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

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