我有一個 GUI，用戶可以在其中單擊一個名為“下一組”的按鈕，允許他們轉到下一個任務。我想添加一個計時器，該計時器在他們啟動應用程式時立即啟動并運行計時器，直到他們按下“下一組”按鈕。單擊時，我希望列印經過的時間和計時器重新啟動，直到他們再次按下“下一個設定”按鈕。我希望計時器在代碼運行時自動啟動。目前，“下一組”按鈕有兩個操作，一個是檢索下一組影像，我嘗試包含的另一個操作是重置計時器和列印時間已過。我還只包含了感覺相關的部分代碼，因為它很長。
import time
import tkinter as tk
import csv
from pathlib import Path
import PIL.Image
import PIL.ImageDraw
import PIL.ImageTk
MAX_HEIGHT = 500
IMAGES_PATH = Path("Images")
CSV_LABELS_KEY = "New Labels"
CSV_FILE_NAME_KEY = "FolderNum_SeriesNum"
CSV_BOUNDING_BOX_KEY = "correct_flip_bbox"
counter = 0
timer_id = None
class App(tk.Frame):
def __init__(self, master=None):
super().__init__(master) # python3 style
self.config_paths = ["config 1.yaml", "config 2.yaml", "config 3.yaml"]
self.config_index = 0
self.clickStatus = tk.StringVar()
self.loadedImages = dict()
self.loadedBoxes = dict() # this dictionary will keep track of all the boxes drawn on the images
self.master.title('Slideshow')
frame = tk.Frame(self)
tk.Button(frame, text=" Next set ", command=lambda:[self.get_next_image_set(), self.reset()]).pack(side=tk.RIGHT)
tk.Button(frame, text=" Exit ", command=self.destroy).pack(side=tk.RIGHT)
frame.pack(side=tk.TOP, fill=tk.BOTH)
self.canvas = tk.Canvas(self)
self.canvas.pack()
self._load_dataset()
self.reset()
self.start_timer = None
t = time()
t.start()
def start_timer(self, evt=None):
if self._start_timer is not None:
self._start_timer = time.perf_counter()
# global counter
# counter = 1
# label.config(text=str(counter))
# label.after(1000, count)
def reset(self):
if self._start_timer is None:
elapsed_time = time.perf_counter() - self._start_timer
self._start_timer = None
print('Time elapsed (hh:mm:ss.ms) {}'.format(elapsed_time))
def _load_dataset(self):
try:
config_path = self.config_paths[self.config_index]
self.config_index = 1
except IndexError:
return
image_data = loadData(config_path)
# drawing the image on the label
self.image_data = image_data
self.currentIndex = 0
# start from 0th image
self._load_image()
def _load_image(self):
imgName = self.image_data[self.currentIndex]['image_file']
if imgName not in self.loadedImages:
self.im = PIL.Image.open(self.image_data[self.currentIndex]['image_file'])
ratio = MAX_HEIGHT / self.im.height
# ratio divided by existing height -> to get constant amount
height, width = int(self.im.height * ratio), int(self.im.width * ratio)
# calculate the new h and w and then resize next
self.canvas.config(width=width, height=height)
self.im = self.im.resize((width, height))
if self.im.mode == "1":
self.img = PIL.ImageTk.BitmapImage(self.im, foreground="white")
else:
self.img = PIL.ImageTk.PhotoImage(self.im)
imgData = self.loadedImages.setdefault(self.image_data[self.currentIndex]['image_file'], dict())
imgData['image'] = self.img
imgData['shapes'] = self.image_data[self.currentIndex]['shapes']
# for next and previous so it loads the same image adn don't do calculations again
self.img = self.loadedImages[self.image_data[self.currentIndex]['image_file']]['image']
self.canvas.create_image(0, 0, anchor=tk.NW, image=self.img)
self.show_drag_box()
def loadData(fname):
with open(fname, mode='r') as f:
return yaml.load(f.read(), Loader=yaml.SafeLoader)
if __name__ == "__main__":
data = loadData('config 1.yaml')
app = App(data)
app.pack() # goes here
app.mainloop()
uj5u.com熱心網友回復：
我使用了日期時間而不是時間，因為減去兩個日期時間物件將給出包含小時和分鐘的輸出，而減去兩個時間物件只會給出秒。但是，兩者都可以作業，您可能只需要使用時間進行更多的重新格式化。
讀取應用程式啟動時的當前時間并存盤。每次按下按鈕時，從當前時間中減去您存盤的時間，即為您經過的時間。然后只需存盤新的當前時間，直到下一次按下按鈕。下面的代碼演示了這一點。
import tkinter as tk
import datetime as dt
class TimeButton(tk.Frame):
def __init__(self, parent):
super().__init__(parent)
# Start timer
self.current_time = dt.datetime.today()
# Button
self.next_set = tk.Button(self, text='Next Set', command = self.clicked)
self.next_set.pack()
def clicked(self):
now = dt.datetime.today()
time_elapsed = now - self.current_time
print(time_elapsed)
self.current_time = now
if __name__ == "__main__":
window = tk.Tk()
button = TimeButton(window)
button.pack()
window.mainloop()
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