我试图找出如何在一个由盒子限定的画布区域上显示工具提示。理想情况下，如果用户悬停在点上并且在10像素的误差范围内，则会出现工具提示。
import tkinter as tk;
from idlelib.ToolTip import ToolTip;
windowWidth = 960;
windowHeight = 720;
canvasWidth = windowWidth - 10;
canvasHeight = windowHeight - 10;
''' Main Window '''
root = tk.Tk();
root.resizable(width=False, height=False);
root.geometry('{}x{}'.format(windowWidth, windowHeight));
root.title('Sample');
''' Canvas '''
canvas = tk.Canvas(root,
width = canvasWidth,
height = canvasHeight,
bg = 'grey');
canvas.pack(side = tk.RIGHT, padx = 5);
xo = canvasWidth / 2
yo = canvasHeight / 2;
point = canvas.create_rectangle(xo - 1, yo - 1, xo + 1, yo + 1,
fill = 'magenta',
outline = 'magenta');
#ToolTip(point, 'origin');
root.mainloop(0);
答案 0 :(得分：3)
实际上，我刚刚测试了一个类，它可以为您在画布上绘制的任何内容创建工具提示，无论是通过标记还是通过ID进行寻址。
import tkinter as tk
import tkinter.ttk as ttk
class CanvasTooltip:
'''
It creates a tooltip for a given canvas tag or id as the mouse is
above it.
This class has been derived from the original Tooltip class I updated
and posted back to StackOverflow at the following link:
https://stackoverflow.com/questions/3221956/
what-is-the-simplest-way-to-make-tooltips-in-tkinter/
41079350#41079350
Alberto Vassena on 2016.12.10.
'''
def __init__(self, canvas, tag_or_id,
*,
bg='#FFFFEA',
pad=(5, 3, 5, 3),
text='canvas info',
waittime=400,
wraplength=250):
self.waittime = waittime # in miliseconds, originally 500
self.wraplength = wraplength # in pixels, originally 180
self.canvas = canvas
self.text = text
self.canvas.tag_bind(tag_or_id, "<Enter>", self.onEnter)
self.canvas.tag_bind(tag_or_id, "<Leave>", self.onLeave)
self.canvas.tag_bind(tag_or_id, "<ButtonPress>", self.onLeave)
self.bg = bg
self.pad = pad
self.id = None
self.tw = None
def onEnter(self, event=None):
self.schedule()
def onLeave(self, event=None):
self.unschedule()
self.hide()
def schedule(self):
self.unschedule()
self.id = self.canvas.after(self.waittime, self.show)
def unschedule(self):
id_ = self.id
self.id = None
if id_:
self.canvas.after_cancel(id_)
def show(self, event=None):
def tip_pos_calculator(canvas, label,
*,
tip_delta=(10, 5), pad=(5, 3, 5, 3)):
c = canvas
s_width, s_height = c.winfo_screenwidth(), c.winfo_screenheight()
width, height = (pad[0] + label.winfo_reqwidth() + pad[2],
pad[1] + label.winfo_reqheight() + pad[3])
mouse_x, mouse_y = c.winfo_pointerxy()
x1, y1 = mouse_x + tip_delta[0], mouse_y + tip_delta[1]
x2, y2 = x1 + width, y1 + height
x_delta = x2 - s_width
if x_delta < 0:
x_delta = 0
y_delta = y2 - s_height
if y_delta < 0:
y_delta = 0
offscreen = (x_delta, y_delta) != (0, 0)
if offscreen:
if x_delta:
x1 = mouse_x - tip_delta[0] - width
if y_delta:
y1 = mouse_y - tip_delta[1] - height
offscreen_again = y1 < 0 # out on the top
if offscreen_again:
# No further checks will be done.
# TIP:
# A further mod might automagically augment the
# wraplength when the tooltip is too high to be
# kept inside the screen.
y1 = 0
return x1, y1
bg = self.bg
pad = self.pad
canvas = self.canvas
# creates a toplevel window
self.tw = tk.Toplevel(canvas.master)
# Leaves only the label and removes the app window
self.tw.wm_overrideredirect(True)
win = tk.Frame(self.tw,
background=bg,
borderwidth=0)
label = ttk.Label(win,
text=self.text,
justify=tk.LEFT,
background=bg,
relief=tk.SOLID,
borderwidth=0,
wraplength=self.wraplength)
label.grid(padx=(pad[0], pad[2]),
pady=(pad[1], pad[3]),
sticky=tk.NSEW)
win.grid()
x, y = tip_pos_calculator(canvas, label)
self.tw.wm_geometry("+%d+%d" % (x, y))
def hide(self):
if self.tw:
self.tw.destroy()
self.tw = None
if __name__ == '__main__':
import random
def further_text():
info_text = ('\n\nGo over any rectangle with your mouse pointer to see it '
'changing to yellow and stay on it long enough (less than '
'a second) to let it show its own customized '
'CanvasTooltip instance.\n\n'
'Click once using the mouse left button over a rectangle '
'to start dragging it to the desired new position and '
'release the left button when you are done.\n\n'
'Double click inside the canvas using the mouse left '
'button to redraw a new set of rectangles.\n\n'
'HtH. ;) Alberto Vassena')
# texts generated at http://lorem-ipsum.perbang.dk/
short_text = ('Lorem ipsum dolor sit amet, mauris tellus, '
'porttitor torquent eu. Magna aliquet lorem, '
'cursus sit ac, in in. Dolor aliquet, cum integer. '
'Proin aliquet, porttitor pulvinar mauris. Tellus '
'lectus, amet cras, neque lacus quis. Malesuada '
'nibh. Eleifend nam, in eget a. Nec turpis, erat '
'wisi semper')
medium_text = ('Lorem ipsum dolor sit amet, suspendisse aenean '
'ipsum sollicitudin, pellentesque nunc ultrices ac '
'ut, arcu elit turpis senectus convallis. Ac orci '
'pretium sed gravida, tortor nulla felis '
'consectetuer, mauris egestas est erat. Ut enim '
'tellus at diam, ac sagittis vel proin. Massa '
'eleifend orci tortor sociis, scelerisque in pede '
'metus phasellus, est tempor gravida nam, ante '
'fusce sem tempor. Mi diam auctor vel pede, mus '
'non mi luctus luctus, lectus sit varius repellat '
'eu')
long_text = ('Lorem ipsum dolor sit amet, velit eu nam cursus '
'quisque gravida sollicitudin, felis arcu interdum '
'error quam quis massa, et velit libero ligula est '
'donec. Suspendisse fringilla urna ridiculus dui '
'volutpat justo, quisque nisl eget sed blandit '
'egestas, libero nullam magna sem dui nam, auctor '
'vehicula nunc arcu vel sed dictum, tincidunt vitae '
'id tristique aptent platea. Lacus eros nec proin '
'morbi sollicitudin integer, montes suspendisse '
'augue lorem iaculis sed, viverra sed interdum eget '
'ut at pulvinar, turpis vivamus ac pharetra nulla '
'maecenas ut. Consequat dui condimentum lectus nulla '
'vitae, nam consequat fusce ac facilisis eget orci, '
'cras enim donec aenean sed dolor aliquam, elit '
'lorem in a nec fringilla, malesuada curabitur diam '
'nonummy nisl nibh ipsum. In odio nunc nec porttitor '
'ipsum, nunc ridiculus platea wisi turpis praesent '
'vestibulum, suspendisse hendrerit amet quis vivamus '
'adipiscing elit, ut dolor nec nonummy mauris nec '
'libero, ad rutrum id tristique facilisis sed '
'ultrices. Convallis velit posuere mauris lectus sit '
'turpis, lobortis volutpat et placerat leo '
'malesuada, vulputate id maecenas at a volutpat '
'vulputate, est augue nec proin ipsum pellentesque '
'fringilla. Mattis feugiat metus ultricies repellat '
'dictum, suspendisse erat rhoncus ultricies in ipsum, '
'nulla ante pellentesque blandit ligula sagittis '
'ultricies, sed tortor sodales pede et duis platea')
text = random.choice([short_text, medium_text, long_text,
info_text, info_text, info_text])
return 'Further info: ' + text
class MyCanvas(tk.Canvas):
def clear(self):
self.delete('rectangle')
def draw(self):
width, height = int(self['width']), int(self['height'])
colors = ('blue', 'green', 'red',
'brown', 'cyan', 'magenta',
'violet', 'black', 'white')
self.tooltips = []
mask = '{} rectangle #{}.\n'
for i in range(20):
x, y = random.randint(0, width - 1), random.randint(0, height - 1)
w, h = random.randint(5, 100), random.randint(5, 100)
tag = 'R{}'.format(i)
color = random.choice(colors)
text = mask.format(color.capitalize(), tag[1:]) + further_text()
id_ = self.create_rectangle(x, y, x + w, y + h,
fill=color,
activefill='yellow',
tags=('rectangle', tag))
tooltip = CanvasTooltip(self, id_, text=text)
self.tooltips.append(tooltip)
def redraw(self, event):
self.clear()
self.draw()
def onClick(self, event):
coords = self.canvasx(event.x, 1), self.canvasy(event.y, 1)
found = self.find_closest(*coords)[0]
if found:
self.target = found
self.drag_x, self.drag_y = coords
self.tag_raise(found)
else:
self.target, self.drag_x, self.drag_y = None, None, None
def onDrag(self, event):
if self.target is None:
return
coords = self.canvasx(event.x, 1), self.canvasy(event.y, 1)
self.move(self.target,
coords[0] - self.drag_x,
coords[1] - self.drag_y)
self.drag_x, self.drag_y = coords
def onRelease(self, event):
self.target, self.drag_x, self.drag_y = None, None, None
def main():
root = tk.Tk()
frame = ttk.Frame(root)
c = frame.canvas = MyCanvas(frame.master, width=800, height=600)
c.draw()
c.bind('<Double-Button-1>', c.redraw)
c.tag_bind('rectangle', '<Button-1>', c.onClick)
c.tag_bind('rectangle', '<B1-Motion>', c.onDrag)
c.tag_bind('rectangle', '<ButtonRelease-1>', c.onRelease)
c.grid(column=0, row=0, padx=(0, 0), pady=(0, 0))
frame.grid()
root.mainloop()
main()
HTH。相反，In this post, in my answer会找到可应用于其他小部件的相同解决方案（稍作更改），例如按钮，标签和复选框。
答案 1 :(得分：0)
据我所知，tk无法做到这一点。我最终导入了Pmw并使用了气球。