如何在弹出窗口上打开pdf文件？

Question

我用tkinter制作了一个pdf查看器。我想知道我是否可以让pdf文件‘弹出’使用Toplevel()功能。我尝试使用lambda来尝试在使用按钮时合并Toplevel()，但是弹出窗口没有反映任何内容。下面是我编写的代码：

from tkinter import *
from tkinter import ttk
from tkinter import filedialog
from tkPDFViewer import tkPDFViewer as pdf
import os 

#make tk case
root = Tk() 
root.geometry("1000x700+200+100")
root.title("PDF Viewer")
root.configure(bg="light blue")  

#view frame
view_frame=Frame(root, bg="light blue", bd=5, width=400)
view_frame.pack(side=LEFT)  

#to generate pop up window to view PDFs  
def popup(filename):  
    win=Toplevel()  
    win.geometry("100x80")  
    win.title(filename)  
    

v2=None 
file = ''
#search for files
def viewpdf():
#make v2 global
    global v2

    filename=filedialog.askopenfilename(initialdir=os.getcwd(),
                                        title="Select PDF File",
                                        filetype=(("PDF File", ".pdf"),
                                                  ("PDF File", ".PDF"),
                                                  ("All File",".txt")))

    if filename:
        global file
        file=filename
        #destroy old file if it exists
        if v2:
            v2.destroy()
        #create new pdf images  
        v1=pdf.ShowPdf()
        #clear stored images
        v1.img_object_li.clear()
        #store new images
        v2=v1.pdf_view(view_frame, pdf_location=open(filename,"r"),height=50, width=80)
        v2.pack(pady=(0,0))

#set buttons
view_button=Button(view_frame, text='SEARCH FOR FILES', command=lambda: [viewpdf(), popup(file)], width=50, bd=5)
view_button.pack()  

root.mainloop()

Answer 1

更新:我尝试过在tkinter.TopLevel()中添加def viewpdf()，它成功了！我也删除了def popup()。

from tkinter import *
from tkinter import ttk
from tkinter import filedialog
from tkPDFViewer import tkPDFViewer as pdf
import os 

#make tk case
root = Tk() 
root.geometry("1000x700+200+100")
root.title("PDF Viewer")
root.configure(bg="light blue")  

#view frame
view_frame=Frame(root, bg="light blue", bd=5, width=400)
view_frame.pack(side=LEFT)  


v2 = None
#search for files
def viewpdf():
    #make v2 global
    global v2

    filename=filedialog.askopenfilename(initialdir=os.getcwd(),
                                        title="Select PDF File",
                                        filetype=(("PDF File", ".pdf"),
                                                  ("PDF File", ".PDF"),
                                              ("All File",".txt")))

    if filename:
        
        #destroy old file if it exists
        if v2:
            v2.destroy()
        #create new pdf images  
        v1=pdf.ShowPdf()
        #clear stored images
        v1.img_object_li.clear()
        #set a new pop out window
        newWindow=tkinter.Toplevel(view_frame)
        #store new images
        v2=v1.pdf_view(newWindow, pdf_location=filename, height=50, width=80)
        v2.pack(pady=(0,0))