Click through images and text with a tkinter GUI in Python

Question

I have a pandas database with slides and text named "df_slides". I would like to make a tkinter GUI to click through the slides and display the text, like that:

This is what I have implemented so far:

import tkinter
from PIL import Image, ImageTk
import base64
import pandas as pd

i = 0
def load_next_img():
    global pil_image, tk_image, i, text

    i = i+1
    base64string = df_slides["Slide_Image"][i]
    imgdata = base64.b64decode(base64string)
    pil_image =  Image.open(io.BytesIO(imgdata))
    tk_image = ImageTk.PhotoImage(pil_image)
    label['image'] = tk_image

    text = df_slides["Text"][i]



def load_previous_img():
    global pil_image, tk_image, i, text

    i = i-1
    base64string = df_slides["Slide_Image"][i]
    imgdata = base64.b64decode(base64string)
    pil_image =  Image.open(io.BytesIO(imgdata))
    tk_image = ImageTk.PhotoImage(pil_image)
    label['image'] = tk_image

    text = df_slides["Text"][i]





root = tkinter.Tk()
label = tkinter.Label(root)
label.pack(side = "bottom", fill = "both", expand = "yes")
load_next_img()

nextbutton = tkinter.Button(text="next", command=load_next_img)
nextbutton.pack()
backbutton = tkinter.Button(text="back", command=load_previous_img)
backbutton.pack()

T = tkinter.Text(root, height=10, width=30)
T.pack()
T.insert(tkinter.END, text)


root.mainloop()

This is the current result:

As you can see the text does not use the full width and more importantly it does not update together with the slide when I press "next" and "back". The slide updates but the text stays the same all the time.

Bruno Vermeulen · Accepted Answer · 2019-10-19 15:45:44Z

1

T.insert(tkinter.END, text) must appear in the functions load_next_img and load_previous_img. For me the easiest way is to define a class 'Slides' to get the namespace right. Note to update the label use self.label.configure(image=tk_image)

Below an example where I have commented out the dataframe but should give a hint on how to resolve. Note to clear the text I have also added a line self.T.delete('1.0', tkinter.END)

import tkinter
from PIL import Image, ImageTk
import base64
import pandas as pd


class Slides:

    def __init__(self):
        self.text_array = ['hello there', 'good bye']
        self.pic_array = ['test_1.jpg', 'test_2.jpg']

        self.root = tkinter.Tk()

        nextbutton = tkinter.Button(text="next", command=self.load_next_img)
        nextbutton.pack()
        backbutton = tkinter.Button(text="back", command=self.load_previous_img)
        backbutton.pack()

        self.slide_image = tkinter.Label(self.root)
        self.slide_image.pack(side="bottom", fill="both", expand="yes")

        self.text_box = tkinter.Text(self.root, height=10, width=30)
        self.text_box.pack()

        self.i = -1
        self.load_next_img()

        self.root.mainloop()

    def load_next_img(self):
        self.i += 1
        # base64string = df_slides["Slide_Image"][i]
        # imgdata = base64.b64decode(base64string)
        pil_image =  Image.open(self.pic_array[self.i % 2])
        pil_image = pil_image.resize((200, 200), Image.ANTIALIAS)  # just for my convenience
        tk_image = ImageTk.PhotoImage(image=pil_image)
        self.slide_image.configure(image=tk_image)
        self.slide_image.image = tk_image

        text = self.text_array[self.i % 2]
        self.text_box.delete('1.0', tkinter.END)
        self.text_box.insert(tkinter.END, text)

    def load_previous_img(self):
        self.i -= 1
        # base64string = df_slides["Slide_Image"][i]
        # imgdata = base64.b64decode(base64string)
        pil_image = Image.open(self.pic_array[self.i % 2])
        pil_image = pil_image.resize((200, 200), Image.ANTIALIAS) # just for my convenience
        tk_image = ImageTk.PhotoImage(image=pil_image)
        self.slide_image.configure(image=tk_image)
        self.slide_image.image = tk_image

        text = self.text_array[self.i % 2]
        self.text_box.delete('1.0', tkinter.END)
        self.text_box.insert(tkinter.END, text)


def main():
    slides = Slides()


if __name__ == '__main__':
    main()

To get the positioning right for the buttons, label and text I would advice to use grid, rather than pack.

PS. I took the liberty to change the variables label to slide_image and T to text_box

edited Oct 19, 2019 at 15:45

answered Oct 19, 2019 at 14:44

Bruno Vermeulen

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3 Comments

henry Over a year ago

Thank you very much !! May I ask why you write "self.i %2" and not just "self.i" ? Thanks.

Bruno Vermeulen Over a year ago

This is modulus over 2 so it just loops over my 2 values in the array, you can implement your solution with the Pandas dataframe as you feel fit. If this has answered your question appreciate if you can confirm as solved. Thanks.

henry Over a year ago

Alright. Yes, it did. Thanks a lot for your kind help !

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