Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
276 views
in Technique[技术] by (71.8m points)

python 3.x - Save and Load GUI-tkinter

I want to save and load my GUI.

I have made a GUI and I want that when I click on the save button.

It should save the GUI in some blob of data and when I click on load button then it will load the same GUI again.

My GUI has various text widgets, drop down Option Menu. I am new to python, so someone can help me on this, please?

I have tried pickle module, too.

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can't do what you want to do without doing the work yourself. You'll need to write a function that gathers all the data you need in order to restore the GUI, and then you can save that to disk. Then, when the GUI starts up you can read the data and reconfigure the widgets to contain this data.

Tkinter gives you pretty much everything you need in order to accomplish it, but you have to do all the work yourself. Pickling the GUI won't work.

Here's a contrived example. Enter a few expressions in the window that pops up. Notice that they are added to the combobox. When you exit, the current expression, the saved expressions, and the current value are all saved. The next time you start the GUI, these values will be restored.

try:
    import Tkinter as tk
    import ttk
except ModuleNotFoundError:
    import tkinter as tk
    import tkinter.ttk as ttk
import pickle

FILENAME = "save.pickle"


class Example(tk.Frame):
    def __init__(self, parent):
        self.create_widgets(parent)
        self.restore_state()

    def create_widgets(self, parent):
        tk.Frame.__init__(self, parent, borderwidth=9, relief="flat")

        self.previous_values = []

        l1 = tk.Label(self, text="Enter a mathematical expression:", anchor="w")
        l2 = tk.Label(self, text="Result:", anchor="w")
        self.expressionVar = tk.StringVar()
        self.expressionEntry = ttk.Combobox(self, textvariable=self.expressionVar, values=("No recent values",))
        self.resultLabel = tk.Label(self, borderwidth=2, relief="groove", width=1)
        self.goButton = tk.Button(self, text="Calculate!", command=self.calculate)

        l1.pack(side="top", fill="x")
        self.expressionEntry.pack(side="top", fill="x", padx=(12, 0))
        l2.pack(side="top", fill="x")
        self.resultLabel.pack(side="top", fill="x", padx=(12, 0), pady=4)
        self.goButton.pack(side="bottom", anchor="e", pady=4)

        self.expressionEntry.bind("<Return>", self.calculate)

        # this binding saves the state of the GUI, so it can be restored later
        root.wm_protocol("WM_DELETE_WINDOW", self.save_state)

    def calculate(self, event=None):
        expression = self.expressionVar.get()
        try:
            result = "%s = %s" % (expression, eval(expression))
            self.previous_values.append(expression)
            self.previous_values = self.previous_values[-8:]
            self.expressionVar.set("")
            self.expressionEntry.configure(values=self.previous_values)

        except:
            result = "invalid expression"

        self.resultLabel.configure(text=str(result))

    def save_state(self):
        try:
            data = {
                "previous": self.previous_values,
                "expression": self.expressionVar.get(),
                "result": self.resultLabel.cget("text"),
            }
            with open(FILENAME, "wb") as f:
                pickle.dump(data, f)

        except Exception as e:
            print
            "error saving state:", str(e)

        root.destroy()

    def restore_state(self):
        try:
            with open(FILENAME, "rb") as f:
                data = pickle.load(f)
            self.previous_values = data["previous"]
            self.expressionEntry.configure(values=self.previous_values)
            self.expressionVar.set(data["expression"])
            self.resultLabel.configure(text=data["result"])
        except Exception as e:
            print
            "error loading saved state:", str(e)


if __name__ == "__main__":
    root = tk.Tk()
    Example(root).pack(fill="both", expand=True)
    root.mainloop()

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...