我正在编写一个GUI，以显示已定义的URL列表中的一些图像(亚马逊的书籍封面)，我已经能够成功地将它们加载到面板中，但是尽管使用了线程，但GUI似乎要等到所有循环结束，然后立即显示所有图像，我如何才能使GUI在获取运行时显示每个图像。.GUI基本上是冻结的，直到获取图像为止...谢谢!
再次的问题是，确保在拉动而不是一次全部显示时，我可以在GUI上显示每个图像...
import wx
import os
import sys
import urllib2
import cStringIO
import threading
import time
urls = ['https://images-na.ssl-images-amazon.com/images/I/51-u3J3mtTL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51cRqX8DTgL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/515iBchIIzL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/511MaP7GeJL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/31Pw7voGDFL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51g30m1xpPL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51qx+6aQUnL._AC_US160_.jpg']
class Example(wx.Frame):
def __init__(self, *args, **kwargs):
super(Example, self).__init__(*args, **kwargs)
self.InitUI()
self.Ctrls()
self.makeButtons()
def makeButtons(self):
def _update_data(data):
time.sleep(2)
stream = cStringIO.StringIO(data)
bmp = wx.BitmapFromImage( wx.ImageFromStream( stream ) )
button = wx.Button(self.panel, -1, "Book cover", style=wx.ALIGN_CENTER, size=wx.Size(100,100))
button.SetToolTipString("wx.Button can how have an icon on the left, right,\n"
"above or below the label.")
button.SetBitmap(bmp,
wx.LEFT # Left is the default, the image can be on the other sides too
#wx.RIGHT
#wx.TOP
#wx.BOTTOM
)
button.SetBitmapMargins((4,4))
button.SetFont(wx.Font(8, wx.SWISS, wx.NORMAL, wx.BOLD, False))
self.wrapSizer.Add(button, 1, wx.EXPAND)
self.Show(True)
self.panel.Layout()
def f():
f = urllib2.urlopen(url)
data = f.read()
wx.CallAfter(_update_data, data)
for url in urls:
threading.Thread(target=f).start()
def InitUI(self):
self.SetSize((800, 400))
self.SetTitle('Dynamically Flow Buttons to Next Row on Window-Resize')
self.Centre()
def Sizers(self):
self.wrapSizer = wx.WrapSizer()
self.panel.SetSizer(self.wrapSizer)
def Ctrls(self):
self.panel = wx.Panel(parent=self,pos=wx.Point(0,0), size=wx.Size(750,550), style=wx.TAB_TRAVERSAL)
self.Sizers()
def main():
ex = wx.App()
Example(None)
ex.MainLoop()
if __name__ == '__main__':
main()
最佳答案
如问题代码示例中所尝试的，也有可能立即剥离所有线程。原始代码中的问题是，由于在处理位图请求时存在时间延迟，因此GUI处于阻塞状态。
请记住，在下面的示例中，位图的顺序将取决于线程完成的顺序(在这种情况下，顺序是随机的)。
import wx
import urllib2
import cStringIO
import threading
import time
from random import random
urls = ['https://images-na.ssl-images-amazon.com/images/I/51-u3J3mtTL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51cRqX8DTgL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/515iBchIIzL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/511MaP7GeJL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/31Pw7voGDFL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51g30m1xpPL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51qx+6aQUnL._AC_US160_.jpg']
def url2bmp(url, callback):
f = urllib2.urlopen(url)
data = f.read()
# to simulate random read delay
time.sleep(2 * random())
stream = cStringIO.StringIO(data)
bmp = wx.BitmapFromImage(wx.ImageFromStream(stream))
wx.CallAfter(callback, bmp)
class Example(wx.Frame):
def __init__(self, *args, **kwargs):
super(Example, self).__init__(*args, **kwargs)
self.InitUI()
self.Ctrls()
self.Show(True)
self.makeButtons()
def makeButtons(self):
for url in urls:
threading.Thread(target=url2bmp, args=(url, self.update_ui)).start()
def update_ui(self, bmp):
button = wx.Button(self.panel, -1, "Book cover", style=wx.ALIGN_CENTER, size=wx.Size(100,100))
button.SetToolTipString("wx.Button can how have an icon on the left, right,\n"
"above or below the label.")
button.SetBitmap(bmp,
wx.LEFT # Left is the default, the image can be on the other sides too
#wx.RIGHT
#wx.TOP
#wx.BOTTOM
)
self.wrapSizer.Add(button, 1, wx.EXPAND)
self.panel.Layout()
def InitUI(self):
self.SetSize((800, 400))
self.SetTitle('Dynamically Flow Buttons to Next Row on Window-Resize')
self.Centre()
def Sizers(self):
self.wrapSizer = wx.WrapSizer()
self.panel.SetSizer(self.wrapSizer)
def Ctrls(self):
self.panel = wx.Panel(parent=self,pos=wx.Point(0,0), size=wx.Size(750,550), style=wx.TAB_TRAVERSAL)
self.Sizers()
def main():
ex = wx.App()
Example(None)
ex.MainLoop()
if __name__ == '__main__':
main()
编辑:重新编写示例以首先生成空按钮，然后在位图到达时立即应用它们。现在比较丑，现在应该重构一个比使用标签更安全的
url映射按钮。import wx
import urllib2
import cStringIO
import threading
import time
from random import random
urls = ['https://images-na.ssl-images-amazon.com/images/I/51-u3J3mtTL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51cRqX8DTgL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/515iBchIIzL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/511MaP7GeJL._AC_US100_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51jizRmRYYL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/31Pw7voGDFL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51g30m1xpPL._AC_US160_.jpg',
'https://images-na.ssl-images-amazon.com/images/I/51qx+6aQUnL._AC_US160_.jpg']
def url2bmp(url, callback):
f = urllib2.urlopen(url)
data = f.read()
# to simulate random read delay
time.sleep(2 * random())
stream = cStringIO.StringIO(data)
bmp = wx.BitmapFromImage(wx.ImageFromStream(stream))
wx.CallAfter(callback, url, bmp)
class Example(wx.Frame):
def __init__(self, *args, **kwargs):
super(Example, self).__init__(*args, **kwargs)
self.InitUI()
self.Ctrls()
self.Show(True)
self.makeButtons()
def makeButtons(self):
for url in urls:
self.update_ui(url)
threading.Thread(target=url2bmp, args=(url, self.update_ui)).start()
def update_ui(self, url, bmp=None):
if bmp is None:
# create button, but not bitmap
button = wx.Button(self.panel, -1, url, style=wx.ALIGN_CENTER, size=wx.Size(100,100))
button.SetToolTipString("wx.Button can how have an icon on the left, right,\n"
"above or below the label.")
self.wrapSizer.Add(button, 1, wx.EXPAND)
else:
children = self.wrapSizer.GetChildren()
# http://www.blog.pythonlibrary.org/2012/08/24/wxpython-how-to-get-children-widgets-from-a-sizer/
for widget in children:
button = widget.GetWindow()
if isinstance(button, wx.Button):
if button.GetLabel() == url:
button.SetBitmap(bmp,
wx.LEFT # Left is the default, the image can be on the other sides too
#wx.RIGHT
#wx.TOP
#wx.BOTTOM
)
button.SetLabel('')
self.panel.Layout()
def InitUI(self):
self.SetSize((800, 400))
self.SetTitle('Dynamically Flow Buttons to Next Row on Window-Resize')
self.Centre()
def Sizers(self):
self.wrapSizer = wx.WrapSizer()
self.panel.SetSizer(self.wrapSizer)
def Ctrls(self):
self.panel = wx.Panel(parent=self,pos=wx.Point(0,0), size=wx.Size(750,550), style=wx.TAB_TRAVERSAL)
self.Sizers()
def main():
ex = wx.App()
Example(None)
ex.MainLoop()
if __name__ == '__main__':
main()
关于multithreading - wxpython线程在加载图像时显示图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41339294/