Python/Kivy：按回车键在 TextBox 中设置值

Question

我正在使用python-2.7 和kivy。我正在使用Tree view 动态添加行。label 用向上和向下键选择。我正在尝试当enter 键按下文本是copied 选中的文本被复制到TextBox。有人能告诉我怎么做吗？

test.py

from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import StringProperty
from kivy.uix.popup import Popup
from kivy.properties import ObjectProperty
from kivy.uix.treeview import TreeView, TreeViewLabel, TreeViewNode
from kivy.uix.label import Label

Window.clearcolor = (0.5, 0.5, 0.5, 1)
Window.size = (500, 400)

class User(Screen):

    def add_more(self):
        self.ids.rows.add_row()


class TreeviewGroup(Popup):
    treeview = ObjectProperty(None)
    tv = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(TreeviewGroup, self).__init__(**kwargs)
        self.tv = TreeView(root_options=dict(text=""),
                       hide_root=False,
                       indent_level=4)
        for branch in tree:
            populate_tree_view(self.tv, None, branch)
        self.treeview.add_widget(self.tv)

        self.bind(on_open=self.on_open)

    def on_open(self, *args):
        self._keyboard = Window.request_keyboard(self._keyboard_closed, self)
        self._keyboard.bind(on_key_down=self._on_keyboard_down)
        if self.tv.selected_node is None:
            self.tv.select_node(self.tv.root.nodes[0])

    def _keyboard_closed(self):
        self._keyboard.unbind(on_key_down=self._on_keyboard_down)
        self._keyboard = None

    def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
        node = self.tv.selected_node
        _, key = keycode
        if key in ('down', 'up'):
            parent = node.parent_node
            ix = parent.nodes.index(node)
            nx = ix+1 if 'down' else ix-1
            next_node = parent.nodes[nx % len(parent.nodes)]
            self.tv.select_node(next_node)
            return True
        elif key == 'enter':
            print(node.text)
            keyboard.release()
            self.dismiss()

def populate_tree_view(tree_view, parent, node):
    if parent is None:
        tree_node = tree_view.add_node(TreeViewLabel(text=node['node_id'],
                                                     is_open=True))
    else:
        tree_node = tree_view.add_node(TreeViewLabel(text=node['node_id'],
                                                     is_open=True), parent)

    for child_node in node['children']:
        populate_tree_view(tree_view, tree_node, child_node)


tree = []
rows = [(1, 'test1', 11), (2, 'test2', 2), (3, 'test3', 3)]
for r in rows:
    tree.append({'node_id': r[1], 'children': []})



class TreeViewLabel(Label, TreeViewNode):
    pass


class Row(BoxLayout):
    button_text = StringProperty("")
    popup = ObjectProperty(None)

    def display_groups(self, instance):
        if len(instance.text) > 0:
            if self.popup is None:
                self.popup = TreeviewGroup()
            self.popup.open()



class Rows(BoxLayout):
    row_count = 0

    def __init__(self, **kwargs):
        super(Rows, self).__init__(**kwargs)
        self.add_row()

    def add_row(self):
        self.row_count += 1
        self.add_widget(Row(button_text=str(self.row_count)))


class Test(App):

    def build(self):
        return self.root


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

test.kv

<Button@Button>:
    font_size: 15
    font_name: 'Verdana'


<TextInput@TextInput>:
    font_size: 15
    font_name: 'Verdana'
    padding_y: 3


<Row>:
    size_hint_y: None
    height: self.minimum_height
    height: 40

    Button:
        text: root.button_text
        size_hint_x: None
        top: 200

    TextInput:
        text: ' '
        width: 300
        multiline: False
        on_text_validate: test2.focus = True
        on_focus: root.display_groups(self)


<Rows>:
    size_hint_y: None
    height: self.minimum_height
    orientation: "vertical"

User:
    BoxLayout:
        orientation: "vertical"
        padding : 20, 5

        ScrollView:
            Rows:
                id: rows


        BoxLayout:
            orientation: "horizontal"
            size_hint_x: .2
            size_hint_y: .2

            Button:
                text: "+Add More"
                on_press: root.add_more()

<TreeViewLabel>:
    on_touch_down:
        app.root.name.text = self.text
        app.root.popup.dismiss()

<TreeviewGroup>:
    id: treeview
    treeview: treeview
    title: "Select"
    size_hint: None, None
    size: 400, 200
    auto_dismiss: False

    BoxLayout
        orientation: "vertical"

        BoxLayout:
            id: treeview
        Button:
            size_hint: 1, 0.1
            text: "Close"
            on_release: root.dismiss()

Answer 1

TreeviewGroup 用于填充TextInput，因此它应该将该字段作为属性，从而访问该小部件并设置文本。

class TreeviewGroup(Popup):
    treeview = ObjectProperty(None)
    tv = ObjectProperty(None)

    def __init__(self, text_input, **kwargs):
        super(TreeviewGroup, self).__init__(**kwargs)
        self.text_input = text_input # set property
        self.tv = TreeView(root_options=dict(text=""),
                       hide_root=False,
                       indent_level=4)
        ...

    def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
        ...
        elif key == 'enter':
            self.text_input.text = node.text # set text
            keyboard.release()
            self.dismiss()


...
class Row(BoxLayout):
    button_text = StringProperty("")
    popup = ObjectProperty(None)

    def display_groups(self, instance, value):
        if len(instance.text) > 0 and value:
            if self.popup is None:
                self.popup = TreeviewGroup(instance) # pass TextInput
            self.popup.open()