問題描述

如何在運行時根據(jù)文本量動態(tài)調(diào)整標(biāo)簽或按鈕的大小，尤其是 text_size 和 height?

How do I dynamically resize the a label or button, in particular, the text_size and height, depending on the amount of text, at run-time?

我知道這個問題已經(jīng)以一種方式回答了這個問題:

I am aware that this question has already been answered in one way with this question:

動態(tài)調(diào)整滾動視圖中標(biāo)簽的大小?

我在部分代碼中反映了該示例.

And I reflect that example in part of my code.

問題是在運行時動態(tài)調(diào)整標(biāo)簽和按鈕的大小.使用，例如:

The problem is dynamically resizing the labels and buttons at run-time. Using, for example:

btn = Button(text_size=(self.width, self.height), text='blah blah')

...等等，只會讓程序認(rèn)為(并且在邏輯上如此)self"指的是包含按鈕的類.

...and so on, only makes the program think (and logically so) that the "self" is referring to the class which is containing the button.

那么，我如何在python語言中動態(tài)調(diào)整這些屬性的大小，而不是kivy?

So, how do I dynamically resize these attributes in the python language, not kivy?

我的示例代碼:

import kivy
kivy.require('1.7.2') # replace with your current kivy version !

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
from kivy.uix.button import Button
from kivy.uix.gridlayout import GridLayout

i = range(20)

long_text = 'sometimes the search result could be rather long 
sometimes the search result could be rather long 
sometimes the search result could be rather long '

class ButtonILike(Button):

    def get_text(self):
        return long_text

class HomeScreen(Screen):
    scroll_view = ObjectProperty(None)

    def __init__(self, *args, **kwargs):
        super(HomeScreen, self).__init__(*args, **kwargs)
        layout1 = GridLayout(cols=1, spacing=0, size_hint=(1, None), 
            row_force_default=False, row_default_height=40)
        layout1.bind(minimum_height=layout1.setter('height'),
                     minimum_width=layout1.setter('width'))
        layout1.add_widget(ButtonILike())

        for result in i:

                btn1 = Button(font_name="data/fonts/DejaVuSans.ttf", 
                    size_hint=(1, None), valign='middle',)#, 
                    #height=self.texture_size[1], text_size=(self.width-10, None))
                btn1.height = btn1.texture_size[1]
                btn1.text_size = (btn1.width-20, layout1.row_default_height)
                btn1.text = long_text

                btn2 = Button(font_name="data/fonts/DejaVuSans.ttf", 
                    size_hint=(1, None), valign='middle')

                btn2.bind(text_size=(btn2.width-20, None))
                btn2.text = 'or short'

                layout1.add_widget(btn1)
                layout1.add_widget(btn2)


        scrollview1 = self.scroll_view
        scrollview1.clear_widgets()
        scrollview1.add_widget(layout1)


class mybuttonsApp(App):

    def build(self):

        return HomeScreen()



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

還有kv文件:

#:kivy 1.7.2

<ButtonILike>:
    text_size: self.width-10, None
    size_hint: (1, None)
    height: self.texture_size[1]
    text: root.get_text()
    #on_release: root.RunSearchButton_pressed()

<HomeScreen>:
    scroll_view: scrollviewID
    AnchorLayout:
        size_hint: 1, .1   
        pos_hint: {'x': 0, 'y': .9}
        anchor_x: 'center'
        anchor_y: 'center'
        Label:
            text: 'Button Tester'

    ScrollView:
        id: scrollviewID
        orientation: 'vertical'
        pos_hint: {'x': 0, 'y': 0}
        size_hint: 1, .9
        bar_width: '8dp'

您可以看到我從 kv 文件中添加了按鈕，該按鈕在列表頂部顯示了我想要的所有行為.在運行時調(diào)整窗口大小，您可以看到它的神奇之處.當(dāng)然，更改 text_size 也可以讓我對齊文本.

You can see that I added the button from the kv file which displays all the behavior that I want at the top of the list. Resize your window while running it, and you can see the magic. And, of course, changing the text_size also makes it possible for me to align text.

我根本無法在 python 端實現(xiàn)相同的行為.我的應(yīng)用程序要求在運行時創(chuàng)建按鈕.我認(rèn)為答案可能在于bind()"，盡管不可否認(rèn)，我不確定我在嘗試中是否正確使用了它，或者我是否完全理解它.您可以看到我嘗試使用btn2"，我認(rèn)為它會將文本扔到左側(cè)(因為 halign 默認(rèn)為左側(cè))，但似乎沒有做任何事情.

I simply have not been able to achieve the same behavior on the python side. My app requires that the buttons be created at run-time. I think the answer might lie with "bind()", though admittedly, I'm not sure I used it correctly in my attempts or that I understand it fully. You can see that I tried with "btn2", which I thought would've thrown the text to the left (since halign defaults to left), but didn't seem to do anything.

感謝您的幫助.

推薦答案

我覺得最好的辦法是把Label's/Button's size設(shè)置為texture_size:

I think the best way is to set Label's/Button's size to texture_size:

Label:
    text: "test"
    size_hint: None, None
    size: self.texture_size

    canvas.before: # for testing purposes
        Color:
            rgb: 0, 1, 0
        Rectangle:
            pos: self.pos
            size: self.size

這篇關(guān)于在 python 端動態(tài)調(diào)整 kivy 標(biāo)簽(和按鈕)的大小的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！