我想在我的Python GUI中使用Tkinter添加一个圆形进度条,但我没有找到关于使用Tkinter创建圆形进度条的文档。
如何在Tkinter中创建一个圆形进度条?或者这不可能吗?
如何在Tkinter中创建一个圆形进度条?或者这不可能吗?
虽然没有内置的功能,但您可以创建自己的函数。以下是一个手动在Canvas
上绘制和更新图形的示例:
try:
import Tkinter as tk
import tkFont
import ttk
except ImportError: # Python 3
import tkinter as tk
import tkinter.font as tkFont
import tkinter.ttk as ttk
class CircularProgressbar(object):
def __init__(self, canvas, x0, y0, x1, y1, width=2, start_ang=0, full_extent=360.):
self.custom_font = tkFont.Font(family="Helvetica", size=12, weight='bold')
self.canvas = canvas
self.x0, self.y0, self.x1, self.y1 = x0+width, y0+width, x1-width, y1-width
self.tx, self.ty = (x1-x0) / 2, (y1-y0) / 2
self.width = width
self.start_ang, self.full_extent = start_ang, full_extent
# draw static bar outline
w2 = width / 2
self.oval_id1 = self.canvas.create_oval(self.x0-w2, self.y0-w2,
self.x1+w2, self.y1+w2)
self.oval_id2 = self.canvas.create_oval(self.x0+w2, self.y0+w2,
self.x1-w2, self.y1-w2)
self.running = False
def start(self, interval=100):
self.interval = interval # Msec delay between updates.
self.increment = self.full_extent / interval
self.extent = 0
self.arc_id = self.canvas.create_arc(self.x0, self.y0, self.x1, self.y1,
start=self.start_ang, extent=self.extent,
width=self.width, style='arc')
percent = '0%'
self.label_id = self.canvas.create_text(self.tx, self.ty, text=percent,
font=self.custom_font)
self.running = True
self.canvas.after(interval, self.step, self.increment)
def step(self, delta):
"""Increment extent and update arc and label displaying how much completed."""
if self.running:
self.extent = (self.extent + delta) % 360
self.canvas.itemconfigure(self.arc_id, extent=self.extent)
# Update percentage value displayed.
percent = '{:.0f}%'.format(
round(float(self.extent) / self.full_extent * 100))
self.canvas.itemconfigure(self.label_id, text=percent)
self.canvas.after(self.interval, self.step, delta)
def toggle_pause(self):
self.running = not self.running
class Application(tk.Frame):
def __init__(self, master=None):
tk.Frame.__init__(self, master)
self.grid()
self.createWidgets()
def createWidgets(self):
self.canvas = tk.Canvas(self, width=200, height=200, bg='white')
self.canvas.grid(row=0, column=0, columnspan=2)
self.progressbar = CircularProgressbar(self.canvas, 0, 0, 200, 200, 20)
self.pauseButton = tk.Button(self, text='Pause', command=self.pause)
self.pauseButton.grid(row=1, column=0)
self.quitButton = tk.Button(self, text='Quit', command=self.quit)
self.quitButton.grid(row=1, column=1)
def start(self):
self.progressbar.start()
self.mainloop()
def pause(self):
self.progressbar.toggle_pause()
if __name__ == '__main__':
app = Application()
app.master.title('Sample application')
app.start()
以下是它运行时的一些截图:
我没有足够的声望添加评论,但是目前马丁诺提供的代码不能正常工作,你需要进行更改。
if self.running:
self.cur_extent = (self.cur_extent + delta) % 360
self.canvas.itemconfigure(self.arc_id, extent=self.cur_extent)
to
if self.running:
self.extent = (self.extent + delta) % 360
self.cur_extent = (self.extent + delta) % 360
self.canvas.itemconfigure(self.arc_id, extent=self.cur_extent)
Tkinter没有对圆形进度条提供任何支持。您需要使用一系列图像或在画布上绘制自己的图案。
此外,@martineau的代码需要进行修改
self.tx, self.ty = (x1-x0) / 2, (y1-y0) / 2
需要更改为
self.tx, self.ty = (x1+x0) / 2, (y1+y0) / 2
这样标签的ID实际上就在中间了
Canvas
对象上绘制弧线和/或椭圆。 - martineau