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[app] Display scanning progress in real time
Add fake workload for now that simulates a long running task, displaying the progress it makes in real-time, without interrupting the other parts of the GUI.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| # | ||
| # DVR-Scan: Video Motion Event Detection & Extraction Tool | ||
| # -------------------------------------------------------------- | ||
| # [ Site: https://www.dvr-scan.com/ ] | ||
| # [ Repo: https://github.com/Breakthrough/DVR-Scan ] | ||
| # | ||
| # Copyright (C) 2024 Brandon Castellano <http://www.bcastell.com>. | ||
| # DVR-Scan is licensed under the BSD 2-Clause License; see the included | ||
| # LICENSE file, or visit one of the above pages for details. | ||
| # | ||
|
|
||
| import threading | ||
| import time | ||
| import tkinter as tk | ||
| import tkinter.messagebox as messagebox | ||
| import tkinter.ttk as ttk | ||
| import typing as ty | ||
| from logging import getLogger | ||
|
|
||
| TITLE = "Scanning..." | ||
|
|
||
| logger = getLogger("dvr_scan") | ||
|
|
||
|
|
||
| class ScanWindow: | ||
| def __init__(self, root: tk.Tk, on_destroyed: ty.Callable[[], None]): | ||
| self._root = tk.Toplevel(master=root) | ||
| self._root.withdraw() | ||
| self._root.title(TITLE) | ||
| self._root.resizable(True, True) | ||
| self._root.minsize(320, 240) | ||
|
|
||
| # Widgets | ||
| self._scan_thread = threading.Thread(target=self._do_scan) | ||
| self._stop_scan = threading.Event() | ||
| self._paused = threading.Event() | ||
| self._state_lock = threading.Lock() | ||
| self._on_destroyed = on_destroyed | ||
|
|
||
| self._progress = tk.IntVar(self._root, value=0) | ||
| self._progress_bar = ttk.Progressbar(self._root, variable=self._progress, maximum=10) | ||
|
|
||
| # Layout | ||
| self._root.columnconfigure(0, weight=1) | ||
| self._root.columnconfigure(1, weight=1) | ||
| self._progress_bar.grid(sticky=tk.NSEW, row=0, columnspan=2) | ||
| self._root.bind("<<ProgressUpdate>>", lambda _: self._on_progress()) | ||
| self._root.bind("<<ScanComplete>>", lambda _: self._on_complete()) | ||
| self._root.minsize(width=self._root.winfo_reqwidth(), height=self._root.winfo_reqheight()) | ||
|
|
||
| self._root.bind("<<Shutdown>>", self.stop) | ||
| self._root.protocol("WM_DELETE_WINDOW", self.prompt_stop) | ||
|
|
||
| self._stop_button = tk.Button(self._root, text="Stop", command=self.prompt_stop) | ||
| self._stop_button.grid(row=1, column=0) | ||
|
|
||
| self._close_button = tk.Button( | ||
| self._root, text="Close", command=self._destroy, state=tk.DISABLED | ||
| ) | ||
| self._close_button.grid(row=1, column=1) | ||
|
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| self._prompt_shown = False | ||
|
|
||
| def _on_complete(self): | ||
| logger.debug("scan completed") | ||
| self._stop_button["state"] = tk.DISABLED | ||
| self._close_button["state"] = tk.NORMAL | ||
|
|
||
| def _destroy(self): | ||
| self._root.after(10, self.stop) | ||
| with self._state_lock: | ||
| self._root.destroy() | ||
| self._root = None | ||
| self._on_destroyed() | ||
|
|
||
| def prompt_stop(self): | ||
| if self._stop_scan.is_set(): | ||
| return | ||
| if messagebox.askyesno( | ||
| title="Stop scan?", | ||
| message="Are you sure you want to stop the current scan?", | ||
| icon=messagebox.WARNING, | ||
| ): | ||
| self._destroy() | ||
|
|
||
| def stop(self): | ||
| if not self._stop_scan.is_set(): | ||
| self._stop_scan.set() | ||
| self._scan_thread.join() | ||
|
|
||
| def _on_progress(self): | ||
| self._progress.set(self._progress.get() + 1) | ||
|
|
||
| def show(self): | ||
| logger.debug("starting scan thread showing scan window.") | ||
| self._scan_thread.start() | ||
| self._root.focus() | ||
| self._root.grab_set() | ||
| self._root.deiconify() | ||
| self._root.wait_window() | ||
|
|
||
| def _do_scan(self): | ||
| complete = True | ||
| for _ in range(10): | ||
| if self._stop_scan.is_set(): | ||
| complete = False | ||
| logger.debug("stop event set") | ||
| break | ||
| logger.debug("ping...") | ||
| with self._state_lock: | ||
| if self._root is None: | ||
| logger.debug("root was destroyed, bailing") | ||
| return | ||
| self._root.event_generate("<<ProgressUpdate>>") | ||
| time.sleep(0.3) | ||
| logger.debug("scan complete" if complete else "scan NOT complete") | ||
| self._root.event_generate("<<ScanComplete>>") |