python - 如何在 tkinter 画布中将图像移动到其他图像之上？

Question

我正在尝试使用 tkinter 制作类似于 Photoshop 的应用程序。我使用 tkinter 的列表框来实现图像分层功能，就像在 Photoshop 中一样，列表框中的每个项目都对应一个导入的图像。当列表框中的一项被拖动到另一项的顶部或下方时，相应的图像也应放置在另一张图像的顶部或下方。当列表框中项目的位置发生变化时，如何在不必重新创建图像的情况下实现这一点。我尝试使用项目配置方法，但它没有工作

这是代码（它不是整个代码，只有相关功能）（也忽略缩进和格式）

from tkinter import*
from tkinter import filedialog
import shutil as shu
from PIL import Image,ImageTk
import os


#importing the image into listbox and canvas

   def open(self): #importing the image and inserting into listbox
        file=filedialog.askopenfilename()
        self.temp.append(file)
        for i in self.temp:
            shu.copy(i, 'cache/') #copying the files in a folder called cache
        layers=os.listdir('cache/')

        for i in layers:
            if i not in self.layerbox.get(0,END): #self.layerbox is the listbox
                self.layerbox.insert(0,i)
        self.temp=[]
        self.layer_naming+=1
        self.drawoncanvas()
        os.chdir(self.parent_path)

        def drawoncanvas(self):# this function reads the listbox and displays the images accordingly
         os.chdir('cache/')
    for index,i in enumerate(reversed(self.layerbox.get(0,END))):
        if i not in self.laycanconnect:
            exec('self.pic'+str(index)+'=ImageTk.PhotoImage(Image.open(i))')
            exec('self.pix'+str(index)+'='+ 'self.canvas.create_image(self.canvas.winfo_width()/2,self.canvas.winfo_height()/2,image=self.pic'+str(index)+')')
            exec('self.connector(i,self.pic'+str(index)+')') #There are two  empty dictionaries to store the image creation variable i.e self.pix and the image ii.e self.pic
            exec('self.connector2(i,self.pix'+str(index)+')')
            # self.connector and self.connector2 functions references both image and canvas creation variable using the image file name





    def connector(self,name,key):
        self.laycanconnect[name]=key   #self.laycanconnect and self.laycanconnect2 are the two dictionaries
    def connector2(self,name,key):
        self.laycanconnect2[name]=key


    def setcurrent(self,event):                            #These two functions are bound by mouse events Button 1 and B1-Motion 
                                                            #inorder to implement dragging and dropping of listbox items
        self.curindex=self.layerbox.nearest(event.y)
    def shift(self,event):
        global corx,cory
        i=self.layerbox.nearest(event.y)
        y = self.layerbox.get(self.curindex)
        corx, cory = self.canvas.coords(self.laycanconnect2[y])
        if i<self.curindex: #moving up
            x=self.layerbox.get(i)
            self.layerbox.delete(i)
            self.layerbox.insert(i+1,x)
            self.curindex = i
        elif i>self.curindex:#moving down
            x=self.layerbox.get(i)
            corx, cory = self.canvas.coords(self.laycanconnect2[x])
            self.layerbox.delete(i)
            self.layerbox.insert(i-1,x)
            self.curindex=i
        for  i in reversed(self.layerbox.get(0,END)):
            self.canvas.delete(self.laycanconnect2[i])
            self.laycanconnect2[i]=self.canvas.create_image(corx,cory,image=self.laycanconnect[i])
            #Here is the problem I don't want to recreate the image in order to place 
            #an image over the other

标签： pythontkinterimage-processingdrag-and-droptk