wxPython - refreshing / updating part of the GUI

I use a GridBagSizer with several cells containing a StaticTextCtrl. Some of these texts need to be changed depending on user behaviour. So I need to update the GUI when a change is made. The GridBagSizer is definded in a function that is called by a function in another class, which in turn is called during GUI assembly. To illustrate this, here is a code snippet:

class SampleClass(wx.MiniFrame):

    [...some other code...]

    def makeGUI(self):
        # make panels
        panelFoo = self.makePanelFoo()
        panelBar = self.makePanelBar()
        panelFinal = self.makePanelFinal()

        # pack elements
        self.mainSizer = wx.BoxSizer(wx.VERTICAL)
        self.mainSizer.Add(panelFoo, 1, wx.EXPAND, 0)
        self.mainSizer.Add(panelBar, 1, wx.EXPAND, 0)
        self.mainSizer.Add(panelFinal, 1, wx.EXPAND, 0)

        # fit layout
        self.mainSizer.Fit(self)
        self.SetSizer(self.mainSizer)
    # ----


    [...some other code...]

    def makePanelFinal(self):

        panel = Canvas(self, -1)

        # define canvas parts     
        self.partA = panel.makePartA()        
        self.partB = panel.makePartB()
        self.partC = panel.makePartC()

        # arrange canvas parts
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        mainSizer.Add(self.partA, 1, wx.EXPAND|wx.ALIGN_CENTER|wx.LEFT|wx.RIGHT, mwx.PANEL_SPACE_MAIN)
        mainSizer.Add(self.partB, 0, wx.EXPAND|wx.ALIGN_CENTER|wx.LEFT|wx.RIGHT, mwx.PANEL_SPACE_MAIN)
        mainSizer.Add(self.partC, 0, wx.EXPAND|wx.ALIGN_CENTER|wx.LEFT|wx.RIGHT|wx.BOTTOM, mwx.PANEL_SPACE_MAIN)        

        # fit layout
        mainSizer.Fit(panel)
        panel.SetSizer(mainSizer)

        return panel
    # ----


class Canvas(panel):

    [...some other code...]

    def makePartC(self):

        sizer = wx.StaticBoxSizer(wx.StaticBox(self, -1, ""), wx.VERTICAL)
        grid = wx.GridBagSizer(mwx.GRIDBAG_VSPACE, mwx.GRIDBAG_HSPACE)

        [...some code where the GridBagSizer is made...]

        sizer.Add(grid, 1, wx.EXPAND|wx.AL开发者_运维百科IGN_CENTER|wx.ALL, 5)

        return sizer

I now need to define a function in the class Canvas (or must this be placed in class SampleClass?) that will be called when a change in the GUI is neccessary:

    def updateCanvas(self):
        ??? .Refresh() ???   
    # ----

Could someone please give me a hint which commands I should use?

Thanks, Woodpicker

---

All you need to do is call the StaticText's SetLabel method to update it. I don't usually recommend doing the whole parent.widget.SetLabel() thing though as that can get pretty ugly pretty quickly. It does work, but I prefer using pubsub myself. You can read about that here: http://www.blog.pythonlibrary.org/2010/06/27/wxpython-and-pubsub-a-simple-tutorial/

EDIT: For example, you could have the receiver set up like this:

Publisher().subscribe(self.updateDisplay, ("update.display"))

Then in the function, you'd do something like this:

def updateDisplay(self, msg):
    self.myStaticTxtCtrl.SetLabel(msg.data)

---

You need to save a reference to the wxStaticText in your GridBagSizer and then update the control with the new text.

Here is an example with a FlexGridSizer:

self.fNameC = wx.StaticText(self, -1, fn)
fgs = wx.FlexGridSizer(5, 2, 5, 5)
fgs.Add(self.fNameC, 0, wx.ALIGN_LEFT|wx.ALIGN_CENTER_VERTICAL)

later on I do this:

self.panel.fNameC.SetLabel(fName)