在 Python 中手动更新 Kivy RecycleView
Manually updating Kivy RecycleView in Python
当从 RecycleView class 外部更改数据时，RecycleView 不会更新其 table。作为总结，我正在尝试创建一个简单的股票投资组合经理。
我有一个自定义的 RecycleView class，我称之为 RecycleViewPortfolio，它继承自 RecycleView。在我的 .kv 文件中，我有三个按钮连接到我的 RecycleViewPortfolio class 中的函数 populate_1、populate_2 和 populate_3。每当我按下按钮并调用任何填充函数时，RecycleView 都会按预期运行。
但是，每当我从 RecycleViewPortfolio class 外部更改 RecycleView 数据时，table 都不会更新。例如，我设置了一个全局变量，我已将其导入到我的 .py 文件和 .kv 文件中。每当此全局变量中的此数据发生更改时，我都希望能够更新 table。
我已经尝试查看 Kivy 的文档，其中提到了可以解决此问题的不同功能。但是我想我不知道如何应用这些方法。
import Whosebug.globalvariables as GlobalVariables
from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview import RecycleView
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from kivy.properties import BooleanProperty, ListProperty, ObjectProperty
class AddPopup(Popup):
"""Popup for adding asset"""
asset_name = ObjectProperty
asset_price = ObjectProperty
asset_amount = ObjectProperty
currency = ObjectProperty
asset_class = ObjectProperty
wrapped_button = ObjectProperty()
def __init__(self, *args, **kwargs):
super(AddPopup, self).__init__(*args, **kwargs)
def open(self, correct=True):
super(AddPopup, self).open(correct)
def save_asset(self):
# Make sure no input is empty
if self.asset_name.text.strip() and self.asset_price.text.strip()\
and self.asset_amount.text.strip() and self.currency.text.strip()\
and self.asset_class.text.strip():
GlobalVariables.rv_data_global = [{'text': self.asset_name.text.strip()},
{'text': self.asset_amount.text.strip()},
{'text': self.asset_price.text.strip()}]
self.dismiss()
class RecycleViewPortfolio(RecycleView):
def __init__(self, **kwargs):
super(RecycleViewPortfolio, self).__init__(**kwargs)
self.populate_2()
def populate_1(self):
root = App.get_running_app().root
root.add_popup.open(True)
self.data = GlobalVariables.rv_data_global
def populate_2(self):
self.data = [{'text': str(x)} for x in range(0, 6)]
def populate_3(self):
self.data = [{'text': str(x)} for x in range(6, 12)]
class PortfolioRoot(GridLayout):
"""root to all screens"""
add_popup = ObjectProperty(None)
list = ListProperty([])
def __init__(self, **kwargs):
super(PortfolioRoot, self).__init__(**kwargs)
self.add_popup = AddPopup()
def test_set_data(self):
GlobalVariables.rv_data_global = [{'text': str(x)} for x in range(12, 18)]
class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior, # View Behavior
RecycleGridLayout):
''' Adds selection and focus behaviour to the view. '''
class SelectableButton(RecycleDataViewBehavior, Button): # Data Behavior
''' Add selection support to the Label '''
index = None
selected = BooleanProperty(True)
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 PortfolioApp(App):
"""App object"""
def __init__(self, **kwargs):
super(PortfolioApp, self).__init__(**kwargs)
def build(self):
return PortfolioRoot()
PortfolioApp().run()
.kv 文件
#:kivy 1.10.0
#:import GlobalVariables Whosebug.globalvariables
<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:
print("Pressed")
<WrappedLabel@Label>:
size_hint_y: None
height: self.texture_size[1] + (self.texture_size[1]/2)
markup: True
<RecycleViewPortfolio@RecycleView>:
viewclass: 'SelectableButton'
target_id: None
# id: rv_data_list
data: GlobalVariables.rv_data_global
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
<PortfolioRoot>:
BoxLayout:
list: rv_data_list
size: root.size
orientation: 'vertical'
WrappedLabel:
text: "[b] Portfolio Manager [/b]"
font_size: min(root.height, root.width) / 10
GridLayout:
size_hint_y: None
height: root.height * 0.1
cols: 4
rows: 1
# Settings
padding: root.width * 0.001, root.height * 0.001
spacing: min(root.width, root.height) * 0.001
Button:
text: "Add"
background_color: [1, 1, 1, 1]
on_release:
rv_data_list.populate_1()
print("Add")
Button:
text: "Change"
background_color: [1, 1, 1, 1]
on_release:
rv_data_list.populate_2()
print("Change")
Button:
text: "Remove"
background_color: [1, 1, 1, 1]
on_release:
rv_data_list.populate_3()
print("Remove")
Button:
text: "Test"
background_color: [1, 1, 1, 1]
on_release:
root.test_set_data()
print("Test set data")
RecycleViewPortfolio:
id: rv_data_list
<AddPopup>:
size_hint: 0.8, 0.8
title: "Add Asset"
title_size: root.height * 0.05
auto_dismiss: False
asset_name: asset_name
asset_price: asset_price
asset_amount: asset_amount
currency: currency
asset_class:asset_class
wrapped_button: wrapped_button
BoxLayout:
orientation: 'vertical'
GridLayout:
rows: 5
cols: 2
padding: root.width * 0.02, root.height * 0.02
spacing: min(root.width, root.height) * 0.02
Label:
id: asset_name_label
text: "Asset name"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_name
text: "Asset name"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: asset_price_label
text: "Asset price"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_price
text: "asset"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: asset_amount_label
text: "Asset amount"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_amount
text: "Asset amount"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: currency_label
text: "Asset currency"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: currency
text: "currency"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: asset_class_label
text: "Asset class"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_class
text: "Asset class"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Button:
id: wrapped_button
text: "Save"
size_hint: 1, None
height: root.height / 8
on_release: root.save_asset()
Button:
id: wrapped_button
text: "close"
size_hint: 1, None
height: root.height / 8
on_release: root.dismiss()
globalvariables.py
# global variables
rv_data_global = []
我希望能够创建一个弹出窗口 window，我在其中添加存储在全局变量中的信息，并在进行更改后调用 RecycleView 进行更新。
编辑：添加了一个工作示例
此示例展示了我如何使用按钮 "Change" 和 "Remove" 来按预期填充 RecycleView。但是，当按下添加按钮并出现弹出窗口 window 并按下保存按钮时，RecycleView 不会更新。如果再次按下添加按钮并直接关闭 RecyleView，则会更新并显示正确的信息。
"Test" 按钮也是如此，我在其中调用了一个函数来更改全局变量。从那里我不知道如何更新视图，因为我不再在 RecycleView class.
下工作
TLDR;
数据改变后手动更新RecycleView的方法
我找到了我的一个问题的答案。通过添加：
self.ids.rv_data_list.data = GlobalVariables.rv_data_global
self.ids.rv_data_list.refresh_from_data()
到 test_set_data 函数，我现在可以按照我的要求刷新数据。因此，神奇的是 refresh_from_data() 方法。
通过 App.get_running_app() 我能够从弹出窗口 class.
访问 refresh_from_data() 命令
root = App.get_running_app().root
root.ids.rv_data_list.data = GlobalVariables.rv_data_global
root.ids.rv_data_list.refresh_from_data()
我似乎已经解决了我自己的问题。但如果有人有更好或更清洁的解决方案，请告诉我。
当从 RecycleView class 外部更改数据时，RecycleView 不会更新其 table。作为总结，我正在尝试创建一个简单的股票投资组合经理。
我有一个自定义的 RecycleView class，我称之为 RecycleViewPortfolio，它继承自 RecycleView。在我的 .kv 文件中，我有三个按钮连接到我的 RecycleViewPortfolio class 中的函数 populate_1、populate_2 和 populate_3。每当我按下按钮并调用任何填充函数时，RecycleView 都会按预期运行。
但是，每当我从 RecycleViewPortfolio class 外部更改 RecycleView 数据时，table 都不会更新。例如，我设置了一个全局变量，我已将其导入到我的 .py 文件和 .kv 文件中。每当此全局变量中的此数据发生更改时，我都希望能够更新 table。
我已经尝试查看 Kivy 的文档，其中提到了可以解决此问题的不同功能。但是我想我不知道如何应用这些方法。
import Whosebug.globalvariables as GlobalVariables
from kivy.app import App
from kivy.uix.popup import Popup
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview import RecycleView
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from kivy.properties import BooleanProperty, ListProperty, ObjectProperty
class AddPopup(Popup):
"""Popup for adding asset"""
asset_name = ObjectProperty
asset_price = ObjectProperty
asset_amount = ObjectProperty
currency = ObjectProperty
asset_class = ObjectProperty
wrapped_button = ObjectProperty()
def __init__(self, *args, **kwargs):
super(AddPopup, self).__init__(*args, **kwargs)
def open(self, correct=True):
super(AddPopup, self).open(correct)
def save_asset(self):
# Make sure no input is empty
if self.asset_name.text.strip() and self.asset_price.text.strip()\
and self.asset_amount.text.strip() and self.currency.text.strip()\
and self.asset_class.text.strip():
GlobalVariables.rv_data_global = [{'text': self.asset_name.text.strip()},
{'text': self.asset_amount.text.strip()},
{'text': self.asset_price.text.strip()}]
self.dismiss()
class RecycleViewPortfolio(RecycleView):
def __init__(self, **kwargs):
super(RecycleViewPortfolio, self).__init__(**kwargs)
self.populate_2()
def populate_1(self):
root = App.get_running_app().root
root.add_popup.open(True)
self.data = GlobalVariables.rv_data_global
def populate_2(self):
self.data = [{'text': str(x)} for x in range(0, 6)]
def populate_3(self):
self.data = [{'text': str(x)} for x in range(6, 12)]
class PortfolioRoot(GridLayout):
"""root to all screens"""
add_popup = ObjectProperty(None)
list = ListProperty([])
def __init__(self, **kwargs):
super(PortfolioRoot, self).__init__(**kwargs)
self.add_popup = AddPopup()
def test_set_data(self):
GlobalVariables.rv_data_global = [{'text': str(x)} for x in range(12, 18)]
class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior, # View Behavior
RecycleGridLayout):
''' Adds selection and focus behaviour to the view. '''
class SelectableButton(RecycleDataViewBehavior, Button): # Data Behavior
''' Add selection support to the Label '''
index = None
selected = BooleanProperty(True)
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 PortfolioApp(App):
"""App object"""
def __init__(self, **kwargs):
super(PortfolioApp, self).__init__(**kwargs)
def build(self):
return PortfolioRoot()
PortfolioApp().run()
.kv 文件
#:kivy 1.10.0
#:import GlobalVariables Whosebug.globalvariables
<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:
print("Pressed")
<WrappedLabel@Label>:
size_hint_y: None
height: self.texture_size[1] + (self.texture_size[1]/2)
markup: True
<RecycleViewPortfolio@RecycleView>:
viewclass: 'SelectableButton'
target_id: None
# id: rv_data_list
data: GlobalVariables.rv_data_global
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
<PortfolioRoot>:
BoxLayout:
list: rv_data_list
size: root.size
orientation: 'vertical'
WrappedLabel:
text: "[b] Portfolio Manager [/b]"
font_size: min(root.height, root.width) / 10
GridLayout:
size_hint_y: None
height: root.height * 0.1
cols: 4
rows: 1
# Settings
padding: root.width * 0.001, root.height * 0.001
spacing: min(root.width, root.height) * 0.001
Button:
text: "Add"
background_color: [1, 1, 1, 1]
on_release:
rv_data_list.populate_1()
print("Add")
Button:
text: "Change"
background_color: [1, 1, 1, 1]
on_release:
rv_data_list.populate_2()
print("Change")
Button:
text: "Remove"
background_color: [1, 1, 1, 1]
on_release:
rv_data_list.populate_3()
print("Remove")
Button:
text: "Test"
background_color: [1, 1, 1, 1]
on_release:
root.test_set_data()
print("Test set data")
RecycleViewPortfolio:
id: rv_data_list
<AddPopup>:
size_hint: 0.8, 0.8
title: "Add Asset"
title_size: root.height * 0.05
auto_dismiss: False
asset_name: asset_name
asset_price: asset_price
asset_amount: asset_amount
currency: currency
asset_class:asset_class
wrapped_button: wrapped_button
BoxLayout:
orientation: 'vertical'
GridLayout:
rows: 5
cols: 2
padding: root.width * 0.02, root.height * 0.02
spacing: min(root.width, root.height) * 0.02
Label:
id: asset_name_label
text: "Asset name"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_name
text: "Asset name"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: asset_price_label
text: "Asset price"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_price
text: "asset"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: asset_amount_label
text: "Asset amount"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_amount
text: "Asset amount"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: currency_label
text: "Asset currency"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: currency
text: "currency"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Label:
id: asset_class_label
text: "Asset class"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
TextInput:
id: asset_class
text: "Asset class"
halign: "center"
font_size: root.height/25
text_size: self.width, None
center_y: .5
Button:
id: wrapped_button
text: "Save"
size_hint: 1, None
height: root.height / 8
on_release: root.save_asset()
Button:
id: wrapped_button
text: "close"
size_hint: 1, None
height: root.height / 8
on_release: root.dismiss()
globalvariables.py
# global variables
rv_data_global = []
我希望能够创建一个弹出窗口 window，我在其中添加存储在全局变量中的信息，并在进行更改后调用 RecycleView 进行更新。
编辑：添加了一个工作示例
此示例展示了我如何使用按钮 "Change" 和 "Remove" 来按预期填充 RecycleView。但是，当按下添加按钮并出现弹出窗口 window 并按下保存按钮时，RecycleView 不会更新。如果再次按下添加按钮并直接关闭 RecyleView，则会更新并显示正确的信息。
"Test" 按钮也是如此，我在其中调用了一个函数来更改全局变量。从那里我不知道如何更新视图，因为我不再在 RecycleView class.
下工作TLDR; 数据改变后手动更新RecycleView的方法
我找到了我的一个问题的答案。通过添加：
self.ids.rv_data_list.data = GlobalVariables.rv_data_global
self.ids.rv_data_list.refresh_from_data()
到 test_set_data 函数，我现在可以按照我的要求刷新数据。因此，神奇的是 refresh_from_data() 方法。
通过 App.get_running_app() 我能够从弹出窗口 class.
访问 refresh_from_data() 命令root = App.get_running_app().root
root.ids.rv_data_list.data = GlobalVariables.rv_data_global
root.ids.rv_data_list.refresh_from_data()
我似乎已经解决了我自己的问题。但如果有人有更好或更清洁的解决方案，请告诉我。