Kivy中的自定义可关闭选项卡

Question

我想在kivy中实现自定义可关闭选项卡标题。

我所做的是将一个类：TabbedPanelHeader对象与一个自定义类：CloseButton对象结合在一起。这两个小部件都在类中：BoxLayout，并排。

但是，一旦我将此添加到类：TabbedPanel对象，什么也没有显示出来.. 我不知道如何前进，将非常感谢所有的帮助！

以下是代码的相关部分。

from kivy.uix.behaviors import ButtonBehavior 
from kivy.uix.boxlayout import BoxLayout 
from kivy.uix.image import Image 
from kivy.graphics import * 
from kivy.uix.tabbedpanel import TabbedPanelHeader 

class CloseButton(ButtonBehavior, Image): 
    def __init__(self, **kwargs): 
     super(CloseButton, self).__init__(**kwargs) 
     self.source = 'atlas://data/images/defaulttheme/close' 
     self.size_hint_x = .2 

    def on_press(self): 
     self.source = 'atlas://data/images/defaulttheme/checkbox_radio_off' 

    def on_release(self): 
     self.source = 'atlas://data/images/defaulttheme/checkbox_radio_off' 
     ## do the actual closing of the tab 

class ClosableTabHeader(BoxLayout): 
    def __init__(self, **kwargs): 
     super(ClosableTabHeader, self).__init__(**kwargs) 
     self.size = (100, 30) 
     self.size_hint = (None, None) 
     self.canvas.before.add(Color(.25, .25, .25)) 
     self.canvas.before.add(Rectangle(size=(105, 30))) 
     self.add_widget(TabbedPanelHeader(background_color=(.65, .65, .65, 0), text='testing')) 
     self.add_widget(CloseButton()) 


if __name__ == '__main__': 
    from kivy.app import App 

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

    TestApp().run() 

Answer 1

下面是一些代码，接近实现你想实现

from kivy.app import App 
from kivy.animation import Animation 
from kivy.uix.floatlayout import FloatLayout 
from kivy.uix.tabbedpanel import TabbedPanel, TabbedPanelHeader 
from kivy.factory import Factory 
from kivy.lang import Builder 


class CloseableHeader(TabbedPanelHeader): 
    pass 

class TestTabApp(App): 
    def build(self): 
     return Builder.load_string(''' 
TabbedPanel: 
    do_default_tab: False 
    FloatLayout: 
     BoxLayout: 
      id: tab_1_content 
      Label: 
       text: 'Palim 1' 
     BoxLayout: 
      id: tab_2_content 
      Label: 
       text: 'Palim 2' 
     BoxLayout: 
      id: tab_3_content 
      Label: 
       text: 'Palim 3' 


    CloseableHeader: 
     text: 'tab1' 
     panel: root 
     content: tab_1_content.__self__ 
    CloseableHeader: 
     text: 'tab2' 
     panel: root 
     content: tab_2_content.__self__ 
    CloseableHeader: 
     text: 'tab3' 
     panel: root 
     content: tab_3_content.__self__ 


<CloseableHeader> 
    color: 0,0,0,0 
    disabled_color: self.color 
    # variable tab_width 
    text: 'tabx' 
    size_hint_x: None 
    width: self.texture_size[0] + 40 
    BoxLayout: 
     pos: root.pos 
     size_hint: None, None 
     size: root.size 
     padding: 3 
     Label: 
      id: lbl 
      text: root.text 
     BoxLayout: 
      size_hint: None, 1 
      orientation: 'vertical' 
      width: 22 
      Image: 
       source: 'tools/theming/defaulttheme/close.png' 
       on_touch_down: 
        if self.collide_point(*args[1].pos) :\ 
         root.panel.remove_widget(root); \ 

''') 


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

什么它是基于https://github.com/kivy/kivy/blob/master/examples/widgets/tabbed_panel_showcase.py