我有一个基本的Kivy RecycleView，它使我可以从队列中多选不同的选项。我有一些代码，它获取与队列中每个项目相关的ID并进行一些工作（即，打印出一个Excel文件）。我希望能够在搜索下一个列表之前将选定的项目列表重新设置为空列表。
我有两个问题：
我最终希望能够使用一些搜索条件来获取事件日期列表，然后将其显示在recycleview中。然后，用户将在列表中选择要为其打印excel文档的每个事件，然后单击一个类似“将所选事件打印到excel”的按钮。所以这篇文章是针对我试图重置列表的问题的。我最初试图将重置绑定在“搜索”按钮上，该按钮使用搜索条件建立了recycleview。
class SelectableRecycleBoxLayout(FocusBehavior, LayoutSelectionBehavior,
RecycleBoxLayout):
''' Adds selection and focus behaviour to the view. '''
class SelectableLabel(RecycleDataViewBehavior, Label):
''' Add selection support to the Label '''
index = None
selected = BooleanProperty(False)
selectable = BooleanProperty(True)
selectedList = ["default"]
def refresh_view_attrs(self, rv, index, data):
''' Catch and handle the view changes '''
self.index = index
return super(SelectableLabel, self).refresh_view_attrs(
rv, index, data)
def on_touch_down(self, touch):
''' Add selection on touch down '''
if super(SelectableLabel, 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
if is_selected:
self.selectedList.append(rv.data[index])
print("Adding: " + str(rv.data[index]))
else:
try:
self.selectedList.remove(rv.data[index])
print("Removing: " + str(rv.data[index]))
except:
print("error removing data from list. Couldn't find: " + str(rv.data[index]) + " in the list.")
def getList(self):
return self.selectedList
def resetList(self):
print("resetting")
self.selectedList = []
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
self.data = []
print("RV Init")
class GuiApp(App):
theme_cls = ThemeManager()
theme_cls.theme_style = 'Dark'
previous_date = ''
previous_date2 = ''
StartDate = ObjectProperty("Start Date")
EndDate = ObjectProperty("End Date")
theLabel = SelectableLabel()
def update(self, rv):
print("Updating....")
rv.data = []
#self.theLabel.resetList()
for event in self.serviceList:
print(event)
rv.data.append({'text': event})
def goReset(self):
self.theLabel.resetList()
此页面完全没有格式化，我只是在粗略地研究功能。
Kivy File
<AnotherScreen>:
id: AnotherScreen
name: "AnotherScreen"
rows: 5
padding: 10
spacing: 10
canvas.before:
Color:
rgba: .8, .8, .8, .25
Rectangle:
pos: self.pos
size: self.size
ActionBar:
pos_hint: {'top':1}
ActionView:
use_separator: True
ActionPrevious:
title: 'Harvest Intel'
with_previous: False
ActionButton:
text: 'Home'
on_release: root.manager.current = "MainScreen"
on_press: app.on_home_select(rv)
on_release: root.ids.mySpinner.text = "Ministry"
ActionButton:
text: 'Settings'
BoxLayout:
FloatLayout:
Label:
text: "Choose a Service Type or Date Range: "
pos_hint: {'center_x': .25 , 'center_y': .8}
Label:
text: "Service Type: "
Spinner:
id: mySpinner
size_hint:(None,None)
size: root.width/4,root.height/12
text: "Ministry" #default value showed
values: ["Higher Ground","Awana"] #list of values to show
pos_hint: {'center_x': 0.55, 'center_y': .75}
size_hint: (.28,.08)
on_text: app.chooseServiceType(self.text)
FloatLayout:
orientation: 'vertical'
MDRaisedButton:
id: StartDate
text: app.StartDate
size_hint: None, None
size: 3 * dp(48), dp(48)
pos_hint: {'center_x': .5, 'center_y': .5}
opposite_colors: True
on_release: app.show_example_date_picker(1)
MDLabel:
id: date_picker_label
text: ''
theme_text_color: 'Primary'
size_hint: None, None
size: dp(48)*3, dp(48)
pos_hint: {'center_x': .5, 'center_y': .5}
MDRaisedButton:
id: EndDate
text: app.EndDate
size_hint: None, None
size: 3 * dp(48), dp(48)
pos_hint: {'center_x': .5, 'center_y': .25}
opposite_colors: True
on_release: app.show_example_date_picker(2)
MDLabel:
id: date_picker_label
text: ''
theme_text_color: 'Primary'
size_hint: None, None
size: dp(48)*3, dp(48)
pos_hint: {'center_x': .5, 'center_y': .5}
Button:
id: getdates
text: "getdates"
size_hint: .5,.1
on_press: app.getFutureServices(rv)
Button:
text: "print list"
pos_hint: {'center_x': 0.2, 'center_y': .4}
size_hint: .3, .3
on_press: app.goReset()
on_press: app.printList()
BoxLayout:
orientation: 'vertical'
Label:
size_hint: (1,.3)
text: 'Services'
RV:
id: rv
viewclass: 'SelectableLabel'
SelectableRecycleBoxLayout:
default_size: None, dp(56)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
multiselect: True
touch_multiselect: True
<SelectableLabel>:
# Draw a background to indicate selection
canvas.before:
Color:
rgba: (.0, 0.6, .1, .5) if self.selected else (.2, .2, .2, 1)
Rectangle:
pos: self.pos
size: self.size
我希望可以在代码中使用所选项目的完整列表，但是一旦它们单击“搜索”按钮，该列表就会被清除，并且RecycleView中的所有选定行都未被选中，但是我我不确定该如何更改。
存储所选列表的最佳方法是什么，然后又可以将UI中的所选项目列表和所选标签重置为开始的方式。