鍵綁定不工作

Question

我工作的一個簡單的應用程序來讀取和使用Python 3.4與Tkinter的一個zip文件內顯示的圖像文件序列，就像你可以使用閱讀.cbz漫畫書文件。理想情況下，我想綁定左右鍵分別顯示最後一張和下一張圖片。如果我在代碼中指定zip文件的名稱，這工作正常;但是，如果我使用filedialog.askopenfilename（）對話框指定文件，那麼鍵盤鍵綁定不再起作用。

我認爲這是由於焦點問題，我試着將焦點設置爲鍵綁定到的標籤（都使用label.focus_set（）方法和askopenfilename（）的父項選項）對話）沒有成功。

代碼如下。任何幫助，將不勝感激，因爲它開始讓我瘋了。

from tkinter import * 
from tkinter import filedialog 
import io 
from PIL import Image, ImageTk 
import zipfile 

class ComicDisplay(): 
    def __init__(self, master): 
     frame = Frame(master) 
     frame.pack(fill='both', expand=1) 
     self.parent = master 
     self.fname = "" 
     self.label = Label(frame, bg="brown", height=500) 
     self.current_zip_file = filedialog.askopenfilename(filetypes=[(zip, "*.zip")]) 
     # self.current_zip_file = "C:\\Users\\Alexis\\Dropbox\\Photos.zip" 
     self.image_list = self.acquire_image_list(self.current_zip_file) 
     self.current_image_number = 0 
     self.pil_image = self.acquire_image(self.current_zip_file, self.image_list[self.current_image_number]) 
     self.tk_image = ImageTk.PhotoImage(self.pil_image) 
     self.parent.title(self.fname) 

     self.label.configure(image=self.tk_image) 
     self.label.focus_set() 
     self.label.bind("<Configure>", self.image_resizing) 
     self.label.bind("<Left>", self.get_last_image) 
     self.label.bind("<Right>", self.get_next_image) 
     self.label.bind("<Button-1>", self.get_next_image) 
     self.label.pack(padx=5, pady=5, fill='both', expand=1) 

    def acquire_image_list(self, zip_file): 
     image_list = [] 
     with zipfile.ZipFile(zip_file, "r") as myFile: 
      for filename in myFile.namelist(): 
       image_list.append(filename) 
     image_list.sort() 
     return image_list 

    def acquire_image(self, zip_file, image_file): 
     with zipfile.ZipFile(zip_file, "r") as myFile: 
      self.fname = image_file 
      image_bytes = myFile.read(image_file) 
      data_stream = io.BytesIO(image_bytes) 
      pil_image = Image.open(data_stream) 
      pil_image = self.image_sizer(pil_image) 
      return pil_image 

    def image_sizer(self, image_file, window_size=500): 
     w, h = image_file.size 
     if w > h: 
      image_file_height = int(h*(window_size/w)) 
      image_file = image_file.resize((window_size, image_file_height), Image.ANTIALIAS) 
     else: 
      image_file_width = int(w*(window_size/h)) 
      image_file = image_file.resize((image_file_width, window_size), Image.ANTIALIAS) 
     return image_file 

    def image_resizing(self, event): 
     new_height = root.winfo_height() - 14 
     new_size_image = self.image_sizer(self.pil_image, new_height) 
     self.tk_image = ImageTk.PhotoImage(new_size_image) 
     self.label.configure(image=self.tk_image) 

    def get_next_image(self, event): 
     if self.current_image_number >= len(self.image_list)-1: 
      self.current_image_number = 0 
     else: 
      self.current_image_number += 1 
     self.update_image() 

    def get_last_image(self, event): 
     if self.current_image_number == 0: 
      self.current_image_number = len(self.image_list)-1 
     else: 
      self.current_image_number -= 1 
     self.update_image() 

    def update_image(self): 
     self.fname = self.image_list[self.current_image_number] 
     self.pil_image = self.acquire_image(self.current_zip_file, self.image_list[self.current_image_number]) 
     self.tk_image = ImageTk.PhotoImage(self.pil_image) 
     self.parent.title(self.fname) 
     self.image_resizing(None) 




root = Tk() 
app = ComicDisplay(root) 
root.mainloop() 

Answer 1

布賴恩的評論舉行了答案：延遲打開文件對話框，直到窗口初始化後解決了問題。當應用程序啓動時，而不是打開文件，創建文件打開方法允許鍵綁定工作，因爲他們應該。