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问题描述

我想用kv语言动态制作很多按钮。
但现在我不能......
我现在将在这里显示来源。






  BoxLayout:
orientation:'vertical'
pos:root.pos
size:root.size

GridLayout:
行:2
间距:5
填充:5

按钮:
文本:X0
on_press:root.X 0)
按钮:
文本:X1
on_press:root.X(1)

我想像代码

  BoxLayout:
orientation:'vertical'
pos:root.pos
size:root.size

GridLayout:
rows:2
间距:5
padding:5

为i
按钮:
文本:X#{i}
on_press:root.X(i)

我该怎么办?

解决方案

不可能用kv语言,除了做一些脏的黑客。



要动态创建一组按钮,请使用或将它们添加到py文件中的循环中。



示例:

从functools导入部分

类MyGrid(GridLayout):
def __init __(self,** kwargs):
super(MyGrid,self).__ init __(** kwargs)
self.add_buttons()

def add_buttons(self)
for x in xrange(5):
button = Button(
text ='X'+ str(i),
on_press = partial(self.X,number = i )

self.add_widget(button)

def X(self,caller,number):
print caller,number


I want to make a lot of Buttons at dynamic in kv language.But now I cannot......I will show now source under this.


BoxLayout:
    orientation: 'vertical'
    pos: root.pos
    size: root.size

    GridLayout:
        rows: 2
        spacing: 5
        padding: 5

        Button:
            text: "X0"
            on_press: root.X(0)
        Button:
            text: "X1"
            on_press: root.X(1)

I want to make like under code

BoxLayout:
    orientation: 'vertical'
    pos: root.pos
    size: root.size

    GridLayout:
        rows: 2
        spacing:5
        padding:5

        for i
            Button:
                text: "X#{i}"
                on_press: root.X(i)

How can I do?

解决方案

Such loops aren't possible in kv language, other than doing some dirty hacks.

To create a set of buttons dynamically, either use ListView or add them in a loop inside a py file.

Example:

from functools import partial

class MyGrid(GridLayout):
    def __init__(self, **kwargs):
        super(MyGrid, self).__init__(**kwargs)
        self.add_buttons()

    def add_buttons(self):
        for i in xrange(5):
            button = Button(
                text='X' + str(i),
                on_press=partial(self.X, number=i)
            )
            self.add_widget(button)

    def X(self, caller, number):
        print  caller, number

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09-24 16:43