python-3.x - 仅在文本小部件中的文本上显示 Tkinter 工具提示

Question

描述:

我有一个文本小部件，其中包含一些文本。 我想要一个单词的工具提示。例如，对于特定单词，工具提示 #1，对于其他单词，工具提示 #2，等等。 当我尝试为单个单词创建一个工具提示时，它实际上为整个文本小部件创建了一个工具提示。我知道原因是因为我将 Text 小部件传递给了 HoverInfo 类。

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我的问题:

• 如何为文本小部件中的单词创建工具提示？
• 是否可以为文本小部件中的不同单词动态定义多个工具提示？

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我的描述代码:

from tkinter import *
import re
import tkinter as tk

class HoverInfo(Menu):
    def __init__(self, parent, text, command=None):
       self._com = command
       Menu.__init__(self,parent, tearoff=0)
       if not isinstance(text, str):
          raise TypeError('Trying to initialise a Hover Menu with a non string type: ' + text.__class__.__name__)
       toktext=re.split('\n', text)
       for t in toktext:
          self.add_command(label = t)
          self._displayed=False
          self.master.bind("<Enter>",self.Display )
          self.master.bind("<Leave>",self.Remove )

    def __del__(self):
       self.master.unbind("<Enter>")
       self.master.unbind("<Leave>")

    def Display(self,event):
       if not self._displayed:
          self._displayed=True
          self.post(event.x_root, event.y_root)
       if self._com != None:
          self.master.unbind_all("<Return>")
          self.master.bind_all("<Return>", self.Click)

    def Remove(self, event):
     if self._displayed:
       self._displayed=False
       self.unpost()
     if self._com != None:
       self.unbind_all("<Return>")

    def Click(self, event):
       self._com()



def HelloWorld():
    print('Hello World')


def vp_start_gui():
    global val, w, root, o
    root = Tk()
    canvas = tk.Canvas(root)
    scroll = tk.Scrollbar(root, orient='horizontal', command=canvas.xview)
    canvas.configure(xscrollcommand=scroll.set)
    frame = tk.Frame(canvas) # frame does not get pack() as it needs to be embedded into canvas throught canvas.
    scroll.pack(side='bottom', fill='x')
    canvas.pack(fill='both', expand='yes')
    canvas.create_window((0,0), window=frame, anchor='nw')
    frame.bind('<Configure>', lambda x: canvas.configure(scrollregion=canvas.bbox('all'))) # lambda function

    journal = tk.Text(frame, width = 75, height = 39)
    journal.configure(background="#f2f2f2")
    journal.configure(borderwidth="3")
    journal.configure(relief="groove")
    journal.grid() # grid instead
    journal.insert("end", "I want tooltip over this text only")    
    hover = HoverInfo(journal,'while hovering press return \n for an exciting msg', HelloWorld)


    root.mainloop()    


if __name__ == '__main__':
    vp_start_gui()

Answer 1

您可以将标签添加到文本小部件中的字符范围。然后您可以绑定(bind)鼠标事件<Enter>和<Leave.到这些标签。

这是一个非常人为的示例:

import tkinter as tk

def show_info(text):
    label.configure(text=text)

root = tk.Tk()
text_widget = tk.Text(root)
label = tk.Label(root)

label.pack(side="top", fill="x")
text_widget.pack(fill="both", expand=True)

for color in ("red", "orange", "yellow", "green", "blue", "indigo", "violet"):
    tag = color
    text = color
    text_widget.insert("end", text+"\n", (tag, ))

    text_widget.tag_configure(tag, background=color, foreground="white")
    text_widget.tag_bind(tag, "<Enter>",
                         lambda event, color=color: show_info(color))
    text_widget.tag_bind(tag, "<Leave>",
                         lambda event, color=color: show_info(""))

tk.mainloop()