基维。动态地将节点添加到树视图答案

【问题标题】：Kivy. Adding nodes to a Tree View dynamically基维。动态地将节点添加到树视图
【发布时间】：2018-12-20 21:51:07
【问题描述】：

我正在尝试将add_nodes 循环到TreeView。

我有一个带有雇佣信息和分配 ID 的 sql 数据库。我需要从数据库中添加具有它们名称的节点，并从TreeViewButton 分配变量id，它们各自从数据库中的id。我还需要将方法 clk 绑定到添加的节点。

我该怎么做？谢谢！

这是我目前所拥有的：

.py 文件：

    import sqlite3

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.treeview import TreeView, TreeViewNode
from functools import partial

Builder.load_file("test1.kv")


class TreeViewButton(Button, TreeViewNode):
    id = ""
    def clk(self):
        print(id)

class OrgChart(Screen, TreeViewButton):

    def __init__(self, **kwargs):
        super(OrgChart, self).__init__(**kwargs)
        self.createTree()

    def extractNames(self):
        cur = sqlite3.connect('QLA_491.s3db').cursor()
        query = cur.execute('SELECT * FROM QLA_049P')
        colname = [d[0] for d in query.description]
        result_list = []
        for r in query.fetchall():
            row = {}
            for i in range(len(colname)):
                row[colname[i]] = r[i]
            result_list.append(row)
            del row

        cur.close()
        cur.connection.close()
        print(result_list)
        return result_list

    def createTree(self):
        tv = TreeView()
        for dict in self.extractNames():
            for key, value in dict.items():
                if key == "Button_ID":
                    self.ids.tv.add_node(TreeViewButton())
                    self.id=value
                    self.bind(on_press=self.clk)



sm = ScreenManager()
sm.add_widget(OrgChart())


class MainApp(App):

    def build(self):
        return sm


if __name__ == "__main__":
    MainApp().run()

.kv 文件：

#:import RiseInTransition kivy.uix.screenmanager.RiseInTransition
#:import ListAdapter kivy.adapters.listadapter.ListAdapter
#:import ListAdapter kivy.adapters.listadapter.ListAdapter
#:import ListItemButton kivy.uix.listview.ListItemButton
#:import Factory kivy.factory.Factory
#:import TreeViewLabel kivy.uix.treeview.TreeViewLabel
#:import TreeViewNode kivy.uix.treeview.TreeViewNode
#:import Image kivy.uix.image 

<OrgChart>:
    name: "OrgChart"
    ScrollView:
        GridLayout:
            cols: 3
            size_hint_y: None
            height: self.minimum_height
            do_scroll_x: False
            TreeView:
                id: tv
                root_options: {'text': 'Root directory','font_size': 15}
                size_hint_y: None
                height: self.minimum_height
            Widget:
                size_hint: [.8,.12]
            Widget:
                size_hint: [.8,.12]

【问题讨论】：

标签： python python-3.x kivy kivy-language

【解决方案1】：

试试这个：

...

from kivy.properties import StringProperty
...


class TreeViewButton(Button, TreeViewNode):
    #id = ""
    id = StringProperty('') #or other type

    def __init__(self, **kwargs):
        super(TreeViewButton, self).__init__(**kwargs)
        self.bind(is_selected = self.clk)

    def clk(self):
        #prints only on the selection and not on the deselection
        if self.is_selected:
            print(id)

class OrgChart(Screen, TreeViewButton):
...
    def createTree(self):
        tv = TreeView()
        for dict in self.extractNames():
            for key, value in dict.items():
                if key == "Button_ID":
                    self.ids.tv.add_node(TreeViewButton(id = value))
                    #self.id=value
                    #self.bind(on_press=self.clk)

干杯。

【讨论】：