cca20a649c
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42190 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
258 lines
7.1 KiB
Python
258 lines
7.1 KiB
Python
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import random
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import time
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import thread
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import wx
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import wx.lib.newevent
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#----------------------------------------------------------------------
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# This creates a new Event class and a EVT binder function
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(UpdateBarEvent, EVT_UPDATE_BARGRAPH) = wx.lib.newevent.NewEvent()
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#----------------------------------------------------------------------
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class CalcBarThread:
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def __init__(self, win, barNum, val):
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self.win = win
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self.barNum = barNum
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self.val = val
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def Start(self):
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self.keepGoing = self.running = True
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thread.start_new_thread(self.Run, ())
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def Stop(self):
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self.keepGoing = False
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def IsRunning(self):
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return self.running
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def Run(self):
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while self.keepGoing:
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evt = UpdateBarEvent(barNum = self.barNum, value = int(self.val))
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wx.PostEvent(self.win, evt)
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sleeptime = (random.random() * 2) + 0.5
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time.sleep(sleeptime/4)
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sleeptime = sleeptime * 5
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if int(random.random() * 2):
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self.val = self.val + sleeptime
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else:
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self.val = self.val - sleeptime
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if self.val < 0: self.val = 0
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if self.val > 300: self.val = 300
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self.running = False
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#----------------------------------------------------------------------
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class GraphWindow(wx.Window):
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def __init__(self, parent, labels):
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wx.Window.__init__(self, parent, -1)
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self.values = []
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for label in labels:
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self.values.append((label, 0))
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font = wx.Font(12, wx.SWISS, wx.NORMAL, wx.BOLD)
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self.SetFont(font)
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self.colors = [ wx.RED, wx.GREEN, wx.BLUE, wx.CYAN,
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"Yellow", "Navy" ]
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self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnEraseBackground)
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self.Bind(wx.EVT_PAINT, self.OnPaint)
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def SetValue(self, index, value):
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assert index < len(self.values)
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cur = self.values[index]
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self.values[index:index+1] = [(cur[0], value)]
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def SetFont(self, font):
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wx.Window.SetFont(self, font)
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wmax = hmax = 0
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for label, val in self.values:
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w,h = self.GetTextExtent(label)
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if w > wmax: wmax = w
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if h > hmax: hmax = h
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self.linePos = wmax + 10
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self.barHeight = hmax
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def GetBestHeight(self):
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return 2 * (self.barHeight + 1) * len(self.values)
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def Draw(self, dc, size):
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dc.SetFont(self.GetFont())
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dc.SetTextForeground(wx.BLUE)
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dc.SetBackground(wx.Brush(self.GetBackgroundColour()))
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dc.Clear()
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dc.SetPen(wx.Pen(wx.BLACK, 3, wx.SOLID))
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dc.DrawLine(self.linePos, 0, self.linePos, size.height-10)
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bh = ypos = self.barHeight
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for x in range(len(self.values)):
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label, val = self.values[x]
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dc.DrawText(label, 5, ypos)
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if val:
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color = self.colors[ x % len(self.colors) ]
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dc.SetPen(wx.Pen(color))
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dc.SetBrush(wx.Brush(color))
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dc.DrawRectangle(self.linePos+3, ypos, val, bh)
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ypos = ypos + 2*bh
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if ypos > size[1]-10:
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break
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def OnPaint(self, evt):
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dc = wx.BufferedPaintDC(self)
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self.Draw(dc, self.GetSize())
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def OnEraseBackground(self, evt):
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pass
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#----------------------------------------------------------------------
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class TestFrame(wx.Frame):
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def __init__(self, parent, log):
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wx.Frame.__init__(self, parent, -1, "Thread Test", size=(450,300))
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self.log = log
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#self.CenterOnParent()
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panel = wx.Panel(self, -1)
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panel.SetFont(wx.Font(10, wx.SWISS, wx.NORMAL, wx.BOLD))
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wx.StaticText(panel, -1,
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"This demo shows multiple threads interacting with this\n"
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"window by sending events to it, one thread for each bar.",
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(5,5))
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panel.Fit()
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self.graph = GraphWindow(self, ['Zero', 'One', 'Two', 'Three', 'Four',
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'Five', 'Six', 'Seven'])
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self.graph.SetSize((450, self.graph.GetBestHeight()))
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sizer = wx.BoxSizer(wx.VERTICAL)
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sizer.Add(panel, 0, wx.EXPAND)
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sizer.Add(self.graph, 1, wx.EXPAND)
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self.SetSizer(sizer)
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self.SetAutoLayout(True)
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sizer.Fit(self)
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self.Bind(EVT_UPDATE_BARGRAPH, self.OnUpdate)
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self.threads = []
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self.threads.append(CalcBarThread(self, 0, 50))
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self.threads.append(CalcBarThread(self, 1, 75))
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self.threads.append(CalcBarThread(self, 2, 100))
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self.threads.append(CalcBarThread(self, 3, 150))
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self.threads.append(CalcBarThread(self, 4, 225))
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self.threads.append(CalcBarThread(self, 5, 300))
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self.threads.append(CalcBarThread(self, 6, 250))
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self.threads.append(CalcBarThread(self, 7, 175))
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for t in self.threads:
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t.Start()
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self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
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def OnUpdate(self, evt):
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self.graph.SetValue(evt.barNum, evt.value)
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self.graph.Refresh(False)
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def OnCloseWindow(self, evt):
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busy = wx.BusyInfo("One moment please, waiting for threads to die...")
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wx.Yield()
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for t in self.threads:
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t.Stop()
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running = 1
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while running:
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running = 0
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for t in self.threads:
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running = running + t.IsRunning()
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time.sleep(0.1)
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self.Destroy()
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#---------------------------------------------------------------------------
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class TestPanel(wx.Panel):
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def __init__(self, parent, log):
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self.log = log
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wx.Panel.__init__(self, parent, -1)
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b = wx.Button(self, -1, "Show Threads sample", (50,50))
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self.Bind(wx.EVT_BUTTON, self.OnButton, b)
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def OnButton(self, evt):
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win = TestFrame(self, self.log)
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win.Show(True)
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#---------------------------------------------------------------------------
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def runTest(frame, nb, log):
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win = TestPanel(nb, log)
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return win
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#----------------------------------------------------------------------
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overview = """\
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The main issue with multi-threaded GUI programming is the thread safty
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of the GUI itself. On most platforms the GUI is not thread safe and
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so any cross platform GUI Toolkit and applications written with it
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need to take that into account.
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The solution is to only allow interaction with the GUI from a single
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thread, but this often severely limits what can be done in an
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application and makes it difficult to use additional threads at all.
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Since wxPython already makes extensive use of event handlers, it is a
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logical extension to allow events to be sent to GUI objects from
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alternate threads. A function called wx.PostEvent allows you to do
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this. It accepts an event and an event handler (window) and instead
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of sending the event immediately in the current context like
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ProcessEvent does, it processes it later from the context of the GUI
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thread.
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"""
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if __name__ == '__main__':
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import sys,os
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import run
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run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
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