Question

我使用wxpython作为GUI创建圣诞节的倒计时。我尝试使用secondsLeft测试脚本，以便在画布上打印秒。该程序绘制了秒数，但它们并没有像预期的那样发生变化。

这是我的代码：

"""A simple contdown for Christmas using wxpython as a GUI"""
import wx
import datetime

#Setting our current time.
currentTime = datetime.datetime.now()
now = list(str(currentTime))
now = now[:19]
now = ''.join(now)

#Computing time left.
while now != '2015-12-25 1:00:00':

    if currentTime.month == 11:
        daysLeft = (30 - currentTime.day) + 24

    else:
        daysLeft = 25 - currentTime.day

    if currentTime.hour >= 12:
        hoursLeft = 25 - currentTime.hour

    else:
        hoursLeft = (12 - currentTime.hour) + 13

    minutesLeft = currentTime.minute
    secondsLeft = currentTime.second

    currentTime = datetime.datetime.now()
    now = list(str(currentTime))
    now = now[:19]
    now = ''.join(now)

    class AFrame(wx.Frame):
        def __init__ (self, parent=None, id=-1, title=None):
            wx.Frame.__init__(self, parent, id, title, size=(400, 400))
            self.statbmp = wx.StaticBitmap(self)
            self.draw_image()
            self.Refresh()

        def draw_image(self):
            # select the width and height of the blank bitmap
            # must fit frame
            w, h = 400, 400
            # create the blank bitmap as background
            draw_bmp = wx.EmptyBitmap(w, h)
            #create canvas.
            canvas = wx.MemoryDC(draw_bmp)
            #fill the canvas with white
            canvas.SetBrush(wx.Brush('white'))
            canvas.Clear()
            #get text dimentions.
            tw, th = canvas.GetTextExtent(str(secondsLeft))
            #draw the text.
            canvas.DrawText(str(secondsLeft), (w - tw) / 2, (h - th) / 2 )

            self.statbmp.SetBitmap(draw_bmp)

    app = wx.App(0)
    AFrame(title="Coundown to Christmas").Show()
    app.MainLoop() #Starts frame.

Answer 1

使用wx.Timer每1000毫秒（1秒）运行一次功能。

使用datetime（和deltatime）左转秒。

#!/usr/bin/env python

import wx
import datetime

class AFrame(wx.Frame):

    def __init__ (self):
        wx.Frame.__init__(self, parent=None, id=-1, title="Coundown to Christmas", size=(400, 400))

        # 2015.12.25 1:00:00
        self.future_time = datetime.datetime(2015, 12, 25, 1, 0, 0)

        # create timer
        self.timer = wx.Timer(self)
        # assign draw_image to timer
        self.Bind(wx.EVT_TIMER, self.draw_image, self.timer)
        # start timer 
        self.timer.Start(1000)

        self.statbmp = wx.StaticBitmap(self)
        self.draw_image()
        self.Refresh()

        self.Show()

    def draw_image(self, event=None): # event required by timer

        # get deltatime
        secondsLeft = self.future_time - datetime.datetime.now()

        # get seconds, round to integer, 
        secondsLeft = int(secondsLeft.total_seconds())

        if secondsLeft <= 0:
            secondsLeft = 0
            if self.timer.IsRunning():
                self.timer.Stop()

        # convert to text
        secondsLeft = str(secondsLeft)

        # select the width and height of the blank bitmap
        # must fit frame
        w, h = 400, 400

        # create the blank bitmap as background
        draw_bmp = wx.EmptyBitmap(w, h)

        #create canvas.
        canvas = wx.MemoryDC(draw_bmp)
        #fill the canvas with white
        canvas.SetBrush(wx.Brush('white'))
        canvas.Clear()

        #get text dimentions.
        tw, th = canvas.GetTextExtent(secondsLeft)

        #draw the text.
        canvas.DrawText(secondsLeft, (w - tw) / 2, (h - th) / 2 )

        self.statbmp.SetBitmap(draw_bmp)

app = wx.App()
AFrame()
app.MainLoop()

Answer 2

点了一下furas！并且不应该接受这个答案，因为它会剥夺任何信贷应该去的Furas。罗尔夫

#!/usr/bin/env python

import wx
import datetime

class AFrame(wx.Frame):

    def __init__ (self):
        wx.Frame.__init__(self, parent=None, id=-1, title="Countdown to Christmas", size=(400, 400))

        # 2015.12.25 1:00:00
        self.future_time = datetime.datetime(2015, 12, 25, 1, 0, 0)

        # create timer
        self.timer = wx.Timer(self)
        # assign draw_image to timer
        self.Bind(wx.EVT_TIMER, self.draw_image, self.timer)
        # start timer 
        self.timer.Start(1000)

        self.statbmp = wx.StaticBitmap(self)
        self.draw_image()
        self.Refresh()

        self.Show()

    def draw_image(self, event=None): # event required by timer

        # get deltatime
        secondsLeft = self.future_time - datetime.datetime.now()

        # get seconds, round to integer, 
        secondsLeft = int(secondsLeft.total_seconds())

        if secondsLeft <= 0:
            secondsLeft = 0
            if self.timer.IsRunning():
                self.timer.Stop()

        # convert to text
        d, s = divmod(secondsLeft,86400)
        h, s = divmod(s,3600)
        m, s = divmod(s, 60)
        timestamp = 30*"  "
        if d> 0:
            time_stamp = "%02d Days Hrs:%02d Mins:%02d Secs:%02d" % (d,h,m,s)
        elif h > 0:
            time_stamp = "Hrs:%02d Mins:%02d Secs:%02d" % (h,m,s)
        else:
            time_stamp = "Mins:%02d Secs:%02d" % (m,s)
        # select the width and height of the blank bitmap
        # must fit frame
        w, h = 400, 400

        # create the blank bitmap as background
        draw_bmp = wx.EmptyBitmap(w, h)

        #create canvas.
        canvas = wx.MemoryDC(draw_bmp)
        #fill the canvas with white
        canvas.SetBrush(wx.Brush('white'))
        canvas.Clear()

        #get text dimentions.
        tw, th = canvas.GetTextExtent(time_stamp)

        #draw the text.
        canvas.DrawText(time_stamp, (w - tw) / 2, (h - th) / 2 )

        self.statbmp.SetBitmap(draw_bmp)

app = wx.App()
AFrame()
app.MainLoop()

wxpython框架不会在while循环中重新绘制它的内容

2 个答案: