wxPython 2.0b9, first phase (win32)

[wxWidgets.git] / utils / wxPython / tests / test8.py

diff --git a/utils/wxPython/tests/test8.py b/utils/wxPython/tests/test8.py
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+# Thread testing example. Harm van der Heijden, March 26 1999.
+#
+# Rule One in threading: make sure only one thread interacts with the
+# user interface. See the wxTextCtrlQueue class for an example of how
+# to accomplish this
+
+import thread
+import time
+from   whrandom import random
+
+from wxPython.wx import *
+
+# Set this to zero to prevent entering the wxApp mainloop
+# (for testing whether threads work at all in the absense of wxWindows)
+use_wxpython = 1
+
+# write a message to stdout every second
+def DoThread(mesg):
+    while 1:
+        sleeptime = (random() * 3) + 0.5
+       print "Hello from %s (%1.3f)" % (mesg, sleeptime)
+       time.sleep(sleeptime)
+
+# the same, but write it to a textctrl.
+def DoTextCtrlThread(text, mesg):
+    while 1:
+        sleeptime = (random() * 3) + 0.5
+       text.WriteText("Hello from %s (%1.3f)\n" % (mesg, sleeptime))
+       time.sleep(sleeptime)
+
+# A very simple queue for textctrls.
+# Nice demonstration of the power of OO programming too (at least I think so!)
+# WriteText puts text in the queue, rather than writing it immediately.
+# The main (UI) thread must call Flush to force output. (see MyFrame::OnIdle)
+class wxTextCtrlQueue(wxTextCtrl):
+    def __init__(self, parent, id, value, pos, size, flags):
+       wxTextCtrl.__init__(self,parent, id, value, pos, size, flags)
+       self.queue = []
+    def WriteText(self, value):
+       self.queue.append(value)
+    def Flush(self):
+       queue = self.queue
+       self.queue = []
+       for value in queue:
+           wxTextCtrl.WriteText(self,value)
+
+# MyFrame and MyApp are very simple classes to test python threads in
+# wxPython.
+class MyFrame(wxFrame):
+    def __init__(self):
+       wxFrame.__init__(self, NULL, -1, "test threads", wxDefaultPosition, wxSize(300,200))
+       self.text = wxTextCtrlQueue(self, -1, "thread output\n", wxDefaultPosition, wxDefaultSize, wxTE_MULTILINE)
+       menu = wxMenu()
+       menu.Append(1001, "Start thread")
+       self.cnt = 0;
+       menubar = wxMenuBar()
+       menubar.Append(menu, "Action")
+       self.SetMenuBar(menubar)
+       EVT_MENU(self, 1001, self.StartThread)
+    def StartThread(self, event):
+       self.cnt = self.cnt + 1
+       thread.start_new_thread(DoTextCtrlThread, (self.text, "thread %d" % self.cnt))
+    def OnIdle(self, event):
+       self.text.Flush()
+
+class MyApp(wxApp):
+    def OnInit(self):
+       frame = MyFrame()
+       self.SetTopWindow(frame)
+       frame.Show(TRUE)
+       return TRUE
+
+# Start two threads that print a message every second
+thread.start_new_thread(DoThread, ("thread A",))
+thread.start_new_thread(DoThread, ("thread B",))
+
+# if using wxpython, open a frame. Otherwise, just hang in while 1
+if use_wxpython:
+    app = MyApp(0)
+    app.MainLoop()
+else:
+    while 1:
+       print "main loop"
+       time.sleep(4)
+print 'done!'