在kivy Python中，如何固定布局管理器下拉菜单的位置？
In kivy Python, How can I fix the position of a layout manager's Dropdown?
在 kivy 1.11.1 中。和 python 3. 我的根 class 中有一个 FloatLayout，其中包含一个标签和一个下拉列表 [文本输入 + RecycleView]，但是在我的文本输入中编写示例时，文本输入会上升并隐藏我的标签，我希望它是固定的，并且下拉菜单会下降。我尝试深入研究 refresh_view_layout 方法但没有成功。有任何想法吗 ？？谢谢你的帮助:)。这是我的 python 文件：
from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import NumericProperty, ListProperty, BooleanProperty, ObjectProperty, StringProperty
from kivy.uix.recycleview import RecycleView
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
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)
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:
self.parent.parent.parent.children[1].text = self.text # ajout test
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:
print("selection changed to {0}".format(rv.data[index]))
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
class DropDownWidget(BoxLayout):
txt_input = ObjectProperty()
rv = ObjectProperty()
class MyTextInput(TextInput):
txt_input = ObjectProperty()
flt_list = ObjectProperty()
word_list = ListProperty()
#this is the variable storing the number to which the look-up will start
starting_no = NumericProperty(1)
suggestion_text = ''
def __init__(self, **kwargs):
super(MyTextInput, self).__init__(**kwargs)
def on_text(self, instance, value):
#find all the occurrence of the word
self.parent.ids.rv.data = []
matches = [self.word_list[i] for i in range(len(self.word_list)) if self.word_list[i][:self.starting_no] == value[:self.starting_no]]
#display the data in the recycleview
display_data = []
for i in matches:
display_data.append({'text':i})
self.parent.ids.rv.data = display_data
#ensure the size is okay
if len(matches) <= 10:
self.parent.height = (50 + (len(matches)*20))
else:
self.parent.height = 240
def keyboard_on_key_down(self, window, keycode, text, modifiers):
if self.suggestion_text and keycode[1] == 'tab':
self.insert_text(self.suggestion_text + ' ')
return True
return super(MyTextInput, self).keyboard_on_key_down(window, keycode, text, modifiers)
class Body(FloatLayout):
def __init__(self, **kwargs):
super(Body, self).__init__(**kwargs)
self.add_widget(Label(text = 'This Label is hidden by the dropdown if you type in the text input : "row" or "example" \n and I would like the Text Input to be fixed and not going up when changing text',
pos_hint = {'center_x':.5,'center_y':.6},
color = [100,100,100,1]))
widget_1 = DropDownWidget(pos_hint = {'center_x':.5,'center_y':.5}, \
size_hint = (None, None), size = (600, 60))
widget_1.ids.txt_input.word_list = ['row1', 'row2', 'row3', 'row4', 'row5', 'line1','line2',
'example1','example2','example3','example4','example5','example6','example7','example8','example9','example10']
self.add_widget(widget_1)
class MyApp(App):
def build(self):
return Body()
if __name__ == "__main__":
MyApp().run()
和我的 kv 文件：
<Body>:
canvas:
Color:
rgba:(1, 1, 1, 1) # white
Rectangle:
pos: self.pos
size: self.size
<DropDownWidget>:
canvas:
Color:
rgba:(1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
orientation: 'vertical'
spacing: 2
txt_input: txt_input
rv: rv
MyTextInput:
id: txt_input
size_hint_y: None
height: 50
RV:
id: rv
<MyTextInput>:
readonly: False
multiline: False
<SelectableLabel>:
# Draw a background to indicate selection
id: selabel
color: 0,0,0,1
canvas.before:
Color:
rgba: (0, 0, 1, .5) if self.selected else (1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
<RV>:
canvas:
Color:
rgba: 0,0,0,.2
Line:
rectangle: self.x +1 , self.y, self.width - 2, self.height -2
bar_width: 10
scroll_type:['bars']
viewclass: 'SelectableLabel'
SelectableRecycleBoxLayout:
default_size: None, dp(20)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
multiselect: False
实际上，当我 运行 你的代码时，我没有看到你描述的行为。但是，如果将 Label 和 DropDownWidget 添加到 kv，则可以利用 kv 为您设置的绑定。这是我可能会这样做的方法（有很多选择）。首先，我在 DropDownWidget 中添加了一个 ListProperty 来保存 word_list:
class DropDownWidget(BoxLayout):
txt_input = ObjectProperty()
rv = ObjectProperty()
word_list = ListProperty([])
而 Body class 可以是：
class Body(FloatLayout):
pass
那么，kv的开头可以是：
<Body>:
canvas:
Color:
rgba:(1, 1, 1, 1) # white
Rectangle:
pos: self.pos
size: self.size
Label:
id: lab
text: 'This Label is hidden by the dropdown if you type in the text input : "row" or "example"'
pos_hint: {'center_x':.5,'center_y':.6}
color: [100,100,100,1]
size_hint: None, None
size: self.texture_size # use minimal size for the Label
DropDownWidget:
pos_hint: {'center_x':.5}
y: lab.y - self.height # position DropDownWidget just below the Label
size_hint: None, None
size: 600, 60
word_list: ['row1', 'row2', 'row3', 'row4', 'row5', 'line1','line2', 'example1','example2','example3','example4','example5','example6','example7','example8','example9','example10']
<DropDownWidget>:
canvas:
Color:
rgba:(1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
orientation: 'vertical'
spacing: 2
txt_input: txt_input
rv: rv
MyTextInput:
id: txt_input
size_hint_y: None
height: 50
word_list: root.word_list # use the word_list from DropDownWidget
RV:
id: rv
kv 的其余部分没有变化。
在 kivy 1.11.1 中。和 python 3. 我的根 class 中有一个 FloatLayout，其中包含一个标签和一个下拉列表 [文本输入 + RecycleView]，但是在我的文本输入中编写示例时，文本输入会上升并隐藏我的标签，我希望它是固定的，并且下拉菜单会下降。我尝试深入研究 refresh_view_layout 方法但没有成功。有任何想法吗 ？？谢谢你的帮助:)。这是我的 python 文件：
from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.properties import NumericProperty, ListProperty, BooleanProperty, ObjectProperty, StringProperty
from kivy.uix.recycleview import RecycleView
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
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)
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:
self.parent.parent.parent.children[1].text = self.text # ajout test
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:
print("selection changed to {0}".format(rv.data[index]))
class RV(RecycleView):
def __init__(self, **kwargs):
super(RV, self).__init__(**kwargs)
class DropDownWidget(BoxLayout):
txt_input = ObjectProperty()
rv = ObjectProperty()
class MyTextInput(TextInput):
txt_input = ObjectProperty()
flt_list = ObjectProperty()
word_list = ListProperty()
#this is the variable storing the number to which the look-up will start
starting_no = NumericProperty(1)
suggestion_text = ''
def __init__(self, **kwargs):
super(MyTextInput, self).__init__(**kwargs)
def on_text(self, instance, value):
#find all the occurrence of the word
self.parent.ids.rv.data = []
matches = [self.word_list[i] for i in range(len(self.word_list)) if self.word_list[i][:self.starting_no] == value[:self.starting_no]]
#display the data in the recycleview
display_data = []
for i in matches:
display_data.append({'text':i})
self.parent.ids.rv.data = display_data
#ensure the size is okay
if len(matches) <= 10:
self.parent.height = (50 + (len(matches)*20))
else:
self.parent.height = 240
def keyboard_on_key_down(self, window, keycode, text, modifiers):
if self.suggestion_text and keycode[1] == 'tab':
self.insert_text(self.suggestion_text + ' ')
return True
return super(MyTextInput, self).keyboard_on_key_down(window, keycode, text, modifiers)
class Body(FloatLayout):
def __init__(self, **kwargs):
super(Body, self).__init__(**kwargs)
self.add_widget(Label(text = 'This Label is hidden by the dropdown if you type in the text input : "row" or "example" \n and I would like the Text Input to be fixed and not going up when changing text',
pos_hint = {'center_x':.5,'center_y':.6},
color = [100,100,100,1]))
widget_1 = DropDownWidget(pos_hint = {'center_x':.5,'center_y':.5}, \
size_hint = (None, None), size = (600, 60))
widget_1.ids.txt_input.word_list = ['row1', 'row2', 'row3', 'row4', 'row5', 'line1','line2',
'example1','example2','example3','example4','example5','example6','example7','example8','example9','example10']
self.add_widget(widget_1)
class MyApp(App):
def build(self):
return Body()
if __name__ == "__main__":
MyApp().run()
和我的 kv 文件：
<Body>:
canvas:
Color:
rgba:(1, 1, 1, 1) # white
Rectangle:
pos: self.pos
size: self.size
<DropDownWidget>:
canvas:
Color:
rgba:(1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
orientation: 'vertical'
spacing: 2
txt_input: txt_input
rv: rv
MyTextInput:
id: txt_input
size_hint_y: None
height: 50
RV:
id: rv
<MyTextInput>:
readonly: False
multiline: False
<SelectableLabel>:
# Draw a background to indicate selection
id: selabel
color: 0,0,0,1
canvas.before:
Color:
rgba: (0, 0, 1, .5) if self.selected else (1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
<RV>:
canvas:
Color:
rgba: 0,0,0,.2
Line:
rectangle: self.x +1 , self.y, self.width - 2, self.height -2
bar_width: 10
scroll_type:['bars']
viewclass: 'SelectableLabel'
SelectableRecycleBoxLayout:
default_size: None, dp(20)
default_size_hint: 1, None
size_hint_y: None
height: self.minimum_height
orientation: 'vertical'
multiselect: False
实际上，当我 运行 你的代码时，我没有看到你描述的行为。但是，如果将 Label 和 DropDownWidget 添加到 kv，则可以利用 kv 为您设置的绑定。这是我可能会这样做的方法（有很多选择）。首先，我在 DropDownWidget 中添加了一个 ListProperty 来保存 word_list:
class DropDownWidget(BoxLayout):
txt_input = ObjectProperty()
rv = ObjectProperty()
word_list = ListProperty([])
而 Body class 可以是：
class Body(FloatLayout):
pass
那么，kv的开头可以是：
<Body>:
canvas:
Color:
rgba:(1, 1, 1, 1) # white
Rectangle:
pos: self.pos
size: self.size
Label:
id: lab
text: 'This Label is hidden by the dropdown if you type in the text input : "row" or "example"'
pos_hint: {'center_x':.5,'center_y':.6}
color: [100,100,100,1]
size_hint: None, None
size: self.texture_size # use minimal size for the Label
DropDownWidget:
pos_hint: {'center_x':.5}
y: lab.y - self.height # position DropDownWidget just below the Label
size_hint: None, None
size: 600, 60
word_list: ['row1', 'row2', 'row3', 'row4', 'row5', 'line1','line2', 'example1','example2','example3','example4','example5','example6','example7','example8','example9','example10']
<DropDownWidget>:
canvas:
Color:
rgba:(1, 1, 1, 1)
Rectangle:
pos: self.pos
size: self.size
orientation: 'vertical'
spacing: 2
txt_input: txt_input
rv: rv
MyTextInput:
id: txt_input
size_hint_y: None
height: 50
word_list: root.word_list # use the word_list from DropDownWidget
RV:
id: rv
kv 的其余部分没有变化。