tkinter 中的绑定数量是否有限制？

Question

感谢很多人的帮助，我制作了一个拖放卡片的 tkinter UI。

但是，我遇到了另一个大问题。我想用line绑定特定的卡片，但是当line数大于8时绑定不正常。

import tkinter as tk
import tkinter.ttk as ttk
from PIL import ImageTk as itk

window = tk.Tk()
window.state('zoomed')

class DragAndDropArea(tk.Canvas):
    def __init__(self,master, **kwargs):
        tk.Canvas.__init__(self,master, **kwargs)
        self.active = None

        head = self.draw_card(200,200, 15,15, 'red1')
        eye_r = self.draw_card(220,200, 15,15, 'red2')
        eye_l = self.draw_card(180,200, 15,15, 'red3')

        neck = self.draw_card(200,250, 15,15, 'orange1')
        shoulder_r = self.draw_card(230,260, 15,15, 'orange2')
        shoulder_l = self.draw_card(170,260, 15,15, 'orange3')
        spine = self.draw_card(200,320, 15,15, 'orange4')
        pelvis_l = self.draw_card(180,390, 15,15, 'wheat1')
        pelvis_r = self.draw_card(220,390, 15,15, 'wheat2')

        elbow_r = self.draw_card(240,330, 15,15, 'yellow1')
        wrist_r = self.draw_card(240,400, 15,15, 'yellow2')
        fingertip_r = self.draw_card(250,430, 15,15, 'yellow3')

        elbow_l = self.draw_card(160,330, 15,15, 'green1')
        wrist_l = self.draw_card(160,400, 15,15, 'green2')
        fingertip_l = self.draw_card(150,430, 15,15, 'green3')

        knee_l = self.draw_card(180,490, 15,15, 'blue1')
        ankle_l = self.draw_card(180,560, 15,15, 'blue2')
        toe_l = self.draw_card(150,560, 15,15, 'blue3')
        knee_r = self.draw_card(220,490, 15,15, 'purple1')
        ankle_r = self.draw_card(220,560, 15,15, 'purple2')
        toe_r = self.draw_card(250,560, 15,15, 'purple3')

        self.bind_tention(head,eye_l)
        self.bind_tention(head,eye_r)
        self.bind_tention(head,neck)

        self.bind_tention(shoulder_l,neck)
        self.bind_tention(shoulder_r,neck)
        self.bind_tention(spine,neck)
        self.bind_tention(spine,pelvis_l)
        self.bind_tention(spine,pelvis_r)

        #self.bind_tention(shoulder_l,elbow_l)
        #self.bind_tention(elbow_l,wrist_l)
        #self.bind_tention(wrist_l,fingertip_l)
        #self.bind_tention(shoulder_r,elbow_r)
        #self.bind_tention(fingertip_r,wrist_r)
        #self.bind_tention(elbow_r,wrist_r)

        self.bind('<ButtonPress-1>', self.get_item)
        self.bind('<B1-Motion>',self.move_active)
        self.bind('<ButtonRelease-1>', self.set_none)

    def set_none(self,event):
        self.active = None
    def get_item(self,event):
        try:
            item =  self.find_withtag('current')
            print(item)
            self.active = item[0]
        except IndexError:
            pass
            #print('no item was clicked')
    def move_active(self,event):
        if self.active != None:
            coords = self.coords(self.active)
            width = coords[2] - coords[0] #x2-x1
            height= coords[1] - coords[3] #y1-y2
            position = coords[0],coords[1]#x1,y1

            x1 = event.x - width/2
            y1 = event.y - height/2
            x2 = event.x + width/2
            y2 = event.y + height/2

            self.coords(self.active, x1,y1, x2,y2)
            try:
                self.update_tention(self.active)
            except IndexError:
                pass
#                print('no tentions found')

    def update_tention(self, tag):
        tentions = self.find_withtag(f'card {tag}')
        for tention in tentions:
            bounded_cards = self.gettags(tention)
            card = bounded_cards[0][-1]
            card2= bounded_cards[1][-1]
            x1,y1 = self.get_mid_point(card)
            x2,y2 = self.get_mid_point(card2)
            self.coords(tention, x1,y1, x2,y2)
            self.lower(tention)

    def draw_card(self, x,y, width,height, color):
        x1,y1 = x,y
        x2,y2 = x+width,y+height
        reference = self.create_rectangle(x1,y1,x2,y2,
                                      fill = color)
        return reference
    def bind_tention(self, card, another_card):
        x1,y1 = self.get_mid_point(card)
        x2,y2 = self.get_mid_point(another_card)
        tag_I = f'card {card}'
        tag_II= f'card {another_card}'

        reference = self.create_line(x1,y1,x2,y2, fill='black',
                                 tags=(tag_I,tag_II))
        self.lower(reference)

    def bind_tention2(self, card, another_card):
        x1,y1 = self.get_mid_point(card)
        x2,y2 = self.get_mid_point(another_card)
        tag_I = f'card {card}'
        tag_II= f'card {another_card}'

        reference = self.create_line(x1,y1,x2,y2, fill='gray',
                                 tags=(tag_I,tag_II))
        self.lower(reference)

    def get_mid_point(self, card):

        width = coords[2] - coords[0] #x2-x1
    height= coords[1] - coords[3] #y1-y2
    position = coords[0],coords[1]#x1,y1

    mid_x = position[0] + width/2
    mid_y = position[1] - height/2

    return mid_x,mid_y
    def load_bg(self,img_route):
        img = itk.PhotoImage(file=img_route)
        bg= self.create_image(0,0,anchor = tk.NW,image=img)
        return bg
img_route = "C:/Users/ISDL_gram/Documents/hpe/3.png"
area = DragAndDropArea(window, bg='white')
#area.load_bg(img_route)
area.pack(fill='both',expand=1)
window.mainloop()

在这里，我添加了#，因为绑定适用于 8 个张力。当我在#-tagged 中拖动相关卡片时，它仅在初始加载时有效，无法正确更新。现在我认为 update_tention 工作错误，但我很难理解标签是如何工作的。

当我想绑定所有内容时，我会发布图片。请教我该怎么做，非常感谢。

Answer 1

那是因为你弄错了卡号：

def update_tention(self, tag):
    tentions = self.find_withtag(f'card {tag}')
    for tention in tentions:
        bounded_cards = self.gettags(tention)
        card = bounded_cards[0][-1]  # get only the last digit, e.g. get "3" from "card 13"
        card2= bounded_cards[1][-1]  # get only the last digit
        x1,y1 = self.get_mid_point(card)
        x2,y2 = self.get_mid_point(card2)
        self.coords(tention, x1,y1, x2,y2)
        self.lower(tention)

应该是：

def update_tention(self, tag):
    tentions = self.find_withtag(f'card {tag}')
    for tention in tentions:
        bounded_cards = self.gettags(tention)
        card = bounded_cards[0].split()[-1]  # get last number, e.g. "13" from "card 13"
        card2= bounded_cards[1].split()[-1]  # get last number
        x1,y1 = self.get_mid_point(card)
        x2,y2 = self.get_mid_point(card2)
        self.coords(tention, x1,y1, x2,y2)
        self.lower(tention)