Tkinter 标签高度自适应内容

Question

我有一个标签，里面要放不同大小的内容。我想知道这个标签需要多高，这样我就可以调整窗口的大小，让它在不同内容大小下保持一致。我有一个方法，但感觉比应该的要复杂。

我想把标签设置为一个固定的宽度和换行长度：

l = Label(root)
l['width'] = 30
l['wraplength'] = 244
l['text'] = "testing this"

现在我想查询这个标签，看看用了多少行。可是 l['height'] 一直是 0，所以我能想到的最好办法就是用 l.winfo_height()，然后把得到的像素高度转换成使用的行数。可是在 dir(l) 里没有什么能直接给我这个信息的东西，而且这个方法对字体变化和其他变化很脆弱。

有没有什么建议？

更新：根据 Brian Oakley 的建议（这和我在 usenet 上得到的类似），我有了一个大致的解决方案（还需要改进，比如没有考虑到标签在空白处换行）：

import Tkinter as Tk
import tkFont
import random
import sys

def genstr (j):
    rno = random.randint(4,50)
    ret_val = str(j) + ":"
    for i in range (0, rno):
        ret_val += "hello" + str(i)
    return ret_val

def gendata (lh):
    ret_val = []
    for i in range(0,lh):
        ret_val.append (genstr (i))
    return ret_val

data = gendata (100)

root = Tk.Tk()
font = tkFont.Font(family='times', size=13)

class lines:
    def __init__ (self):
        self.lastct = 1   # remember where the cutoff was last work from there

    def count (self, text, cutoff = 400):
        global font
        no_lines = 1
        start_idx = 0
        idx = self.lastct

        while True:
            if idx > len (text):
                idx = len (text)

            # shrink from guessed value
            while font.measure (text[start_idx:idx - 1]) > cutoff:
                if idx <= start_idx:
                    print "error"
                    sys.exit ()
                else:
                    idx -= 1
                    self.lastct = idx - start_idx # adjust since was too big

            # increase from guessed value (note: if first shrunk then done)
            while (idx < len (text)
                   and font.measure (text[start_idx:idx]) < cutoff):
                idx += 1
                self.lastct = idx - start_idx     # adjust since was too small

            # next line has been determined
            print "*" + text[start_idx:idx-1] + "*"
            if idx == len(text) and font.measure (text[start_idx:]) < cutoff:
                return no_lines
            elif idx == len(text):
                return no_lines + 1
            else:
                no_lines += 1
                start_idx = idx - 1
                idx = start_idx + self.lastct

lin = lines()

for i in range(0,len(data)):
    lin.count(data[i], 450)

for i in range(0,min(len(data),10)):
    l = Tk.Label(root)
    l.pack()
    l['text'] = data[i]
    print i
    no = lin.count (data[i], 450)
    print "computed lines", no
    l['width'] = 50
    l['justify'] = Tk.LEFT
    l['anchor'] = 'w'
    l['wraplength'] = 450
    l['padx']=10
    l['pady'] = 5
    l['height'] = no
    l['font'] = font
    if i % 2 == 0:
        l['background'] = 'grey80'
    else:
        l['background'] = 'grey70'

root.mainloop()

tkinter 界面设计窗口调整行数计算标签自适应内容换行像素高度字体变化

Tkinter 标签高度自适应内容

1 个回答

撰写回答