laner.kv

<MyCard>:
    radius: dp(5)
    size_hint:(1,1)
    # theme_bg_color: "Custom"
    on_release: app.my_screen_manager.current_screen.setPath(self.path)
    
    AsyncImage:
        id: test_stuff
        source: root.icon
        size_hint: [.8,.6] if root.icon=='assets/icons/file.png' else [.9,.7]
        fit_mode: 'contain'
        mipmap: True
        pos_hint: {"top":1}
        radius: (dp(5),dp(5),0,0)
    MDButton:
        # theme_bg_color:  "Custom"
        theme_height:  "Custom"
        theme_width:  "Custom"
        opacity: 0 if root.is_dir else 1
        radius: '15sp'
        size_hint:  [None, None]
        width:  '35sp'
        height: '35sp'
        # md_bg_color: [.7,.6,.9,1]
        pos_hint: {"top": .979, "right": .97}
        on_release: app.my_screen_manager.current_screen.showDownloadDialog(root.path)
        
        MDButtonIcon:
            icon: "download"
            pos_hint: {'x':.23,'y':.2}
            # theme_icon_color: "Custom"
            # icon_color: [1,1,1,1]
        
    MDLabel:
        text: root.myFormat(root.text)
        theme_font_size:'Custom'
        font_size: '11sp'
        size_hint: [None, None]
        size: (root.width, 40)
        text_size: (root.width, None)

<RV>:
    viewclass: 'MyCard'
    My_RecycleGridLayout:
        id: scroll_content
        default_size: 1, '140sp' # children widgets default size
        default_size_hint: 1, None
        cols:4
        spacing:18
        padding:"10dp"
        size_hint: (1, None)
        height: self.minimum_height + 140