Kivy Listview excel文件

Question

我有一个关于 Kivy listview 和 Pandas 数据框的问题。具体如何将数据从 .xlsx 列出到 kivy 的列表视图，然后让我们说删除选定的条目。这是我的主要代码：

import pandas
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.listview import ListItemButton

class ItemsListItemButton(ListItemButton):
    pass

class QuestionDb(BoxLayout):
    items_list = ObjectProperty()

    def dataframe(self):
        df = pandas.read_excel("items.xlsx")
        return df


class QuestionApp(App):
    def build(self):
        return QuestionDb()

Questionapp= QuestionApp()
Questionapp.run()

这是用于获取列表视图和按钮的 question.kv 文件

#: import main question
#: import ListAdapter kivy.adapters.listadapter.ListAdapter
#: import LitsItemButton kivy.uix.listview.ListItemButton


QuestionDb:

<QuestionDb>:
    items_list:  items_list_view
    ListView:
       id:items_list_view
       adapter:
           ListAdapter(data=main.QuestionDb.dataframe(self) , 
cls=main.ItemsListItemButton)
    Button:
        text: "Deletes selected entry on press"

这是我们设置为数据框的 excel 电子表格“items.xlsx”：

 Item:  Cost:   Remaining:
 Boots  10$     5
 Socks  2$      4
 Hats   5$      10

现在使用 kivy 中的这个设置列表视图只显示列名并且不列出其他项目，我如何才能使项目列出示例：

Boots  10$     5
Socks  2$     4
Hats   5$     10

而不是这个

此外，关于如何链接按钮以随后删除所选条目的任何提示也将不胜感激。

希望这是有道理的。

Answer 1

您应该使用 Recycleview 因为Listview 自版本 1.10.0 以来已被弃用。

在下面的例子中，我们使用了一个Recycleview和可选择的按钮回收网格布局。Recycleview 支持上下滚动。我们已将按钮与on_release事件绑定。您还可以更改按钮以绑定on_press事件。单击任何行将调用方法delete_row。

Kivy RecycleView 文档

例子

问题.py

import pandas
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

from kivy.uix.label import Label
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.button import Button
from kivy.properties import BooleanProperty, ListProperty, ObjectProperty
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from kivy.core.window import Window


class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior,
                                  RecycleGridLayout):
    ''' Adds selection and focus behaviour to the view. '''


class SelectableButton(RecycleDataViewBehavior, Button):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableButton, self).refresh_view_attrs(
            rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableButton, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        self.selected = is_selected


class QuestionDb(BoxLayout):
    items_list = ObjectProperty(None)
    column_headings = ObjectProperty(None)
    rv_data = ListProperty([])

    def __init__(self, **kwargs):
        super(QuestionDb, self).__init__(**kwargs)
        self.get_dataframe()

    def get_dataframe(self):
        df = pandas.read_excel("items.xlsx")

        # Extract and create column headings
        for heading in df.columns:
            self.column_headings.add_widget(Label(text=heading))

        # Extract and create rows
        data = []
        for row in df.itertuples():
            for i in range(1, len(row)):
                data.append([row[i], row[0]])
        self.rv_data = [{'text': str(x[0]), 'Index': str(x[1]), 'selectable': True} for x in data]

    def delete_row(self, instance):
        # TODO
        print("delete_row:")
        print("Button: text={0}, index={1}".format(instance.text, instance.index))
        print(self.rv_data[instance.index])
        print("Pandas: Index={}".format(self.rv_data[instance.index]['Index']))


class QuestionApp(App):
    def build(self):
        Window.clearcolor = (1, 1, 1, 1)    # white background
        return QuestionDb()


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

问题.kv

#:kivy 1.10.0

<SelectableButton>:
    # Draw a background to indicate selection
    canvas.before:
        Color:
            rgba: (0, 0.517, 0.705, 1) if self.selected else (0, 0.517, 0.705, 1)
        Rectangle:
            pos: self.pos
            size: self.size
    background_color: [1, 0, 0, 1]  if self.selected else [1, 1, 1, 1]  # dark red else dark grey
    on_release: app.root.delete_row(self)

<QuestionDb>:
    column_headings: column_headings
    orientation: "vertical"

    Label:
        canvas.before:
            Color:
                rgba: (0, 0, 1, .5)     # 50% translucent blue
            Rectangle:
                pos: self.pos
                size: self.size
        text: 'Click on any row to delete'
        size_hint: 1, 0.1

    GridLayout:
        canvas.before:
            Color:
                rgba: (1, 0.2, 0, .5)     # 50% translucent orange red
            Rectangle:
                pos: self.pos
                size: self.size

        id: column_headings
        size_hint: 1, None
        size_hint_y: None
        height: 25
        cols: 3

    BoxLayout:
        canvas.before:
            Color:
                rgba: (.0, 0.9, .1, .3)
            Rectangle:
                pos: self.pos
                size: self.size

        RecycleView:
            viewclass: 'SelectableButton'
            data: root.rv_data
            SelectableRecycleGridLayout:
                cols: 3
                key_selection: 'selectable'
                default_size: None, dp(26)
                default_size_hint: 1, None
                size_hint_y: None
                height: self.minimum_height
                multiselect: True
                touch_multiselect: True

输出