Kivy - Python - 在RecycleView行中使用多个小部件

Question

我想创建一个RecycleView，每一行都有多个标签。在我的具体示例中，我希望每行有3个标签：一个标签包含项目索引，一个标签包含来自一个数据集的项目，另一个标签来自另一个数据集。

在这个例子中（取自kivy示例），我们有一个RecycleView，其中每行包含单个标签。

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior

Builder.load_string('''
<SelectableLabel>:
    # Draw a background to indicate selection
    canvas.before:
        Color:
            rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
        Rectangle:
            pos: self.pos
            size: self.size
<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
''')


items_1= {'apple', 'banana', 'pear', 'pineapple'}
items_2= {'dog', 'cat', 'rat', 'bat'}

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:
            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]))
        else:
            print("selection removed for {0}".format(rv.data[index]))


class RV(RecycleView):
    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        self.data = [{'text': str(x)} for x in items_1]


class TestApp(App):
    def build(self):
        return RV()

if __name__ == '__main__':
    TestApp().run()

我希望每个RecycleView行都有3个标签: 第一个标签是索引，第二个标签是items_1，第三个标签是items_2。就像这样:

0 苹果 狗

1 香蕉 猫

2 梨子 鼠

3 菠萝 蝙蝠

谢谢！

- Ben t

Answer 1

我正在寻找类似的解决方案，但找不到。我认为PalimPalim并没有真正回答问题，因为我认为Ben t正在寻找将多个标签小部件视为单行处理的方法。

在这种情况下，您可以使用自定义小部件来控制GridLayout的结构。

<SelectableLabel>:
# Draw a background to indicate selection
canvas.before:
    Color:
        rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
    Rectangle:
        pos: self.pos
        size: self.size
label1_text: 'label 1 text'
label2_text: 'label 2 text'
label3_text: 'label 3 text'
pos: self.pos
size: self.size
Label:
    id: id_label1
    text: root.label1_text
Label:
    id: id_label2
    text: root.label2_text
Label:
    id: id_label3
    text: root.label3_text

将数据应用于RV时，需要重新构建字典以反映标签布局。

class RV(RecycleView):
def __init__(self, **kwargs):
    super(RV, self).__init__(**kwargs)
    paired_iter = zip(items_1, items_2)
    self.data = []
    for i1, i2 in paired_iter:
        d = {'label2': {'text': i1}, 'label3': {'text': i2}}
        self.data.append(d)

在refresh_view_attrs中，您需要指定.label_text，它绑定到每个标签，或者您可以使用标签id。

def refresh_view_attrs(self, rv, index, data):
    ''' Catch and handle the view changes '''
    self.index = index
    self.label1_text = str(index)
    self.label2_text = data['label2']['text']
    self.ids['id_label3'].text = data['label3']['text']  # As an alternate method of assignment
    return super(SelectableLabel, self).refresh_view_attrs(
        rv, index, data)

整段代码如下：

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.properties import BooleanProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior

Builder.load_string('''
<SelectableLabel>:
    # Draw a background to indicate selection
    canvas.before:
        Color:
            rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
        Rectangle:
            pos: self.pos
            size: self.size
    label1_text: 'label 1 text'
    label2_text: 'label 2 text'
    label3_text: 'label 3 text'
    pos: self.pos
    size: self.size
    Label:
        id: id_label1
        text: root.label1_text
    Label:
        id: id_label2
        text: root.label2_text
    Label:
        id: id_label3
        text: root.label3_text

<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
''')


items_1 = {'apple', 'banana', 'pear', 'pineapple'}
items_2 = {'dog', 'cat', 'rat', 'bat'}


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


class SelectableLabel(RecycleDataViewBehavior, GridLayout):
    ''' Add selection support to the Label '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)
    cols = 3

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        self.label1_text = str(index)
        self.label2_text = data['label2']['text']
        self.ids['id_label3'].text = data['label3']['text']  # As an alternate method of assignment
        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:
            print("selection changed to {0}".format(rv.data[index]))
        else:
            print("selection removed for {0}".format(rv.data[index]))


class RV(RecycleView):
    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        paired_iter = zip(items_1, items_2)
        self.data = []
        for i1, i2 in paired_iter:
            d = {'label2': {'text': i1}, 'label3': {'text': i2}}
            self.data.append(d)
        # can also be performed in a complicated one liner for those who like it tricky
        # self.data = [{'label2': {'text': i1}, 'label3': {'text': i2}} for i1, i2 in zip(items_1, items_2)]


class TestApp(App):
    def build(self):
        return RV()

if __name__ == '__main__':
    TestApp().run()

- VectorVictor

Answer 2

最简单的方法是将RecycleBoxLayout更改为具有3列的RecycleGridLayout，并使用以下列表items = [0, "apple", "dog", 1, "banana", "cat", 2, "pear", "rat", 3, "pineapple", "bat"]。显然，您可以坚持原始列表数据结构并将它们合并在一起以形成上面的列表，但我会留给您处理。

另一个可能的选项是向RecycleBoxLayout添加一个horizontal方向的RecycleBoxLayout每行。

---

这是所有的Python代码。

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.properties import BooleanProperty
from kivy.uix.recycleboxlayout import RecycleBoxLayout
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior

Builder.load_string('''
<SelectableLabel>:
    # Draw a background to indicate selection
    canvas.before:
        Color:
            rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
        Rectangle:
            pos: self.pos
            size: self.size
<RV>:
    viewclass: 'SelectableLabel'
    SelectableRecycleGridLayout:
        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
        cols: 3
''')


items = [0, "apple", "dog", 1, "banana", "cat", 2, "pear", "rat", 3,  "pineapple", "bat"]

class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior,
                                RecycleGridLayout):
    ''' 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:
            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]))
        else:
            print("selection removed for {0}".format(rv.data[index]))


class RV(RecycleView):
    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        self.data = [{'text': str(x)} for x in items]


class TestApp(App):
    def build(self):
        return RV()

if __name__ == '__main__':
    TestApp().run()

- PalimPalim

---

这个回答解决了你的问题吗？如果是，请考虑接受它；如果仅仅帮到了你，你也可以考虑点赞。 - PalimPalim

只是一个小修正... 在使用RecycleGridLayout时，在Builder中的<RV>中，方向不能为“垂直”。我将其更改为<< orientation: 'lr-tb' >>，现在它按预期工作。 - iperetta