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POUnexpected behavior of Tkinter's grid embedded in a canvas with more than 280 elements
 

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  1. POUnexpected behavior of Tkinter's grid embedded in a canvas with more than 280 elements
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    <p>I want to display a lot of thumbnails and be able to do different operations on them, depending on the content of the thumbnail. For this I took the example from <a href="https://stackoverflow.com/questions/3085696/adding-a-scrollbar-to-a-grid-of-widgets-in-tkinter">Adding a scrollbar to a group of widgets in Tkinter</a> and put labels in the first column and images in the second column of the embedded grid. As a sample thumbnail you can download this <a href="http://www.tv-handbook.com/images/UI%20Sidewalk%20160x120.jpg" rel="nofollow noreferrer">image</a> and rename it to <code>160x120.jpg</code>.</p> <pre><code>import Tkinter as tk from PIL import Image, ImageTk class Example(tk.Frame): def __init__(self, root): tk.Frame.__init__(self, root) self.canvas = tk.Canvas(root, borderwidth=0, background="#ffffff") self.frame = tk.Frame(self.canvas, background="#ffffff") self.vsb = tk.Scrollbar(root, orient="vertical", command=self.canvas.yview) self.canvas.configure(yscrollcommand=self.vsb.set) self.vsb.pack(side="right", fill="y") self.canvas.pack(side="left", fill="both", expand=True) self.canvas.create_window((4,4), window=self.frame, anchor="nw", tags="self.frame") self.frame.bind("&lt;Configure&gt;", self.OnFrameConfigure) self.photos = [] self.imgs = [] self.images = [] self.lbls = [] self.populate() def populate(self): '''Put in some fake data''' # n_thumbs = 100 : As expected, one label and one image per row. # n_thumbs = 300 : Images are only displayed up to the 278th. # n_thumbs = 600 : Just 63 images are displayed. Two labels per row. n_thumbs = 100 for i in range(n_thumbs): lbl = tk.Label(self.frame, text="img " + str(i), width=10) lbl.grid(row=i, column=0) photo = Image.open("160x120.jpg") img = ImageTk.PhotoImage(photo) image = tk.Label(self.frame, image=img) image.grid(row=i, column=1) self.lbls.append(lbl) self.photos.append(photo) self.images.append(image) self.imgs.append(img) def OnFrameConfigure(self, event): '''Reset the scroll region to encompass the inner frame''' self.canvas.configure(scrollregion=self.canvas.bbox("all")) if __name__ == "__main__": root=tk.Tk() Example(root).pack(side="top", fill="both", expand=True) root.mainloop() </code></pre> <p>Now, if you set <code>n_thumbs = 100</code>, everything works as expected, i.e. there is one label and one image per row.</p> <p>If you set <code>n_thumbs = 300</code>, the list abruptly ends with the 278th image.</p> <p>If you set <code>n_thumbs = 600</code>, only 63 images are shown, but you can still scroll down beyond the last image. Furthermore, suddenly there are two labels in each row.</p> <p>How can these effects be explained? How can I display more than 300 images in a grid using Tkinter?</p>
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