[PEAK] Multi-Component init failure (wxTemperature dialog example)

[Phillip J. Eby]

At 02:50 PM 9/4/2007 -0700, Grant Baillie wrote:
>I realized that my prior "Trellis-ified wx Dialog" example is back to
>having issues the issues I saw here:
>
>http://www.eby-sarna.com/pipermail/peak/2007-July/002744.html
>
>The code was posted on the list, and can be found in the archives here:
>
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>
>
>Basically, I can get around this with some None checking, but IIRC it
>was working in a prior svn release.

Here's the version I've been using, that still works:

from peak.events import trellis
import wx
import wx.xrc

#----------------- domain ----------------------
class TempConverter(trellis.Component):
     trellis.values(
         F = 32,
         C = 0,
     )

     trellis.rules(
         F = lambda self: self.C * 1.8 + 32,
         C = lambda self: (self.F - 32)/1.8,
     )


# ------------- ---------------

class EditBridge(trellis.Component):
     trellis.values(
         widget = None,
         cell = None,
     )
     trellis.rules(
         setup = lambda self: wx.EVT_KILL_FOCUS(self.widget, self.write),
         read = lambda self: self.widget.SetValue(unicode(self.cell)),
     )
     def write(self, event):
         self.cell = float(self.widget.GetValue())

#----------------- app ----------------------

class ConverterDialog(trellis.Component):
     trellis.rules(
         fField = lambda self: EditBridge(
             widget = wx.xrc.XRCCTRL(self.dialog, "ID_F_FIELD"),
             cell = self.converter.__cells__['F']
         ),
         cField = lambda self: EditBridge(
             widget = wx.xrc.XRCCTRL(self.dialog, "ID_C_FIELD"),
             cell = self.converter.__cells__['C']
         ),
         summary = lambda self: wx.xrc.XRCCTRL(self.dialog, "ID_SUMMARY"),
         converter = lambda self: TempConverter(),
         dialog = lambda self: TemperatureDialog(parent=None, id=-1)
     )

     @trellis.rule
     def updateSummary(self):

         if self.converter.F > 80.0:
             self.summary.SetLabel(u"Phew!")
         elif self.converter.C < 5.0:
             self.summary.SetLabel(u"Brrr!")
         else:
             self.summary.SetLabel(u"")

class TemperatureDialog(wx.Dialog):
     def __init__(self, parent, *args, **kw):

         super(TemperatureDialog, self).__init__(parent, *args, **kw)

         resources = wx.xrc.XmlResource("wxTemperature.xrc")
         pre = wx.PreDialog()
         resources.LoadOnDialog(pre, parent, "TemperatureDialog")
         self.PostCreate(pre)

         quit = wx.xrc.XRCCTRL(self, "ID_QUIT")

         self.Bind(wx.EVT_BUTTON, lambda event: wx.GetApp().Exit(), quit)

if __name__ == "__main__":
     app = wx.PySimpleApp(redirect=False)
     cd = ConverterDialog()
     cd.dialog.Show()
     app.MainLoop()