how do I pass values between classes?

[kath]

hi everyone....... ..

I have a task, I have fragmented the task into subtask. I have planned
to create a class to each subclass and one parent class to handle the
sub tasks. Each subclass are saved in seperate file and all my
subclasses and parent class are placed in the same folder.

The parent class is subclass of wx.Frame, and subclasses are subclass
of wx.Panel. Each subclass will create a GUI for each task..

ok.. here is problem

When a menu is selected in the parent class, im instantiating the child
class(i.e, Panel), which has textbox and two buttons. first button is
used to select a file, and second one I have planned to, read the file
and pass the values to parent class OR pass the filepath to
parent to read and do rest of the work.

How do I do that?

Please tell me whether I am following a correct method, by fragmenting
task into small task and assigning it to child class and saving it in
a separate file?.

ok, here is the Parent class

import wx
import client
"""My Parent class"""
class Parent(wx.Frame):
def __init__(self, parent, id, title):
wx.Frame.__init__(self, parent, id, title)

menu=wx.Menu()
menu.Append(5000, "File")
menu.AppendSeparator()
menu.Append(5001, "Exit")
menubar=wx.MenuBar()
menubar.Append(menu, "File")
self.SetMenuBar(menubar)
self.Bind(wx.EVT_MENU, self.OnFile,id=5000)
self.Bind(wx.EVT_MENU, self.OnExit,id=5001)

def OnFile(self, event):
self.cl=client.Child(self, -1)

def OnBrowse(self, event):
dir=""
d=x.FileDialog(self, "Choose an Excel file", self.dirname, "",
"*.xls", wx.OPEN)
if d.ShowModal() == wx.ID_OK:
self.filename=d.GetFilename()
self.dirname=d.GetDirectory()
self.filepath.SetValue(os.path.join(self.dirname,
self.filename))

def OnUpload(self, event):
pass

def OnExit(self, event):
self.Close()

class MyApp(wx.App):
def OnInit(self):
frame=Parent(None, -1, "Parent window")
frame.Show(True)
self.SetTopWindow(frame)
return True

if __name__ == '__main__':
app=MyApp(redirect=False)
app.MainLoop()

and Child class

import wx, os

"""My Child class"""

class Child(wx.Panel):
def __init__(self, parent, id):
wx.Panel.__init__(self, parent, id, size=(300,300))
box=wx.BoxSizer(wx.HORIZONTAL)
label=wx.StaticText(self, -1, "File Path:  ")

self.text=wx.TextCtrl(self, -1)
browse=wx.Button(self, -1,"Browse")
upload=wx.Button(self, -1, "Upload")
self.Bind(wx.EVT_BUTTON, self.OnBrowse, browse)
self.Bind(wx.EVT_BUTTON, self.OnUpload, upload)
box.Add(label)
box.Add(self.text)
box.Add(browse)

mainbox=wx.BoxSizer(wx.VERTICAL)
mainbox.Add(box)
mainbox.Add(upload)

self.SetSizer(mainbox)
mainbox.Layout()
def OnBrowse(self, event):
self.dir=""
d=wx.FileDialog(self, "Choose an Excel file", self.dir, "",
"*.xls", wx.OPEN)
if d.ShowModal() == wx.ID_OK:
self.filename=d.GetFilename()
self.dir=d.GetDirectory()
self.text.SetValue(os.path.join(self.dir, self.filename))

def OnUpload(self, event):
pass

class MyApp(wx.App):
def OnInit(self):
frame=wx.Frame(None, -1, "Child window")
panel=Child(frame, -1)
frame.Show(True)
self.SetTopWindow(frame)
return True

if __name__ == '__main__':
app=MyApp()
app.MainLoop()

thank you,
regards,
kath.

[MC]

Re: how do I pass values between classes?

Hi!

Look Candygram (http://candygram.sourceforge.net/)
Candygram has features who will fun for you (like
inter-threads-comunication).

--
@-salutations

Michel Claveau

[Larry Bates]

Re: how do I pass values between classes?

kath wrote:

hi everyone....... ..
>
I have a task, I have fragmented the task into subtask. I have planned
to create a class to each subclass and one parent class to handle the
sub tasks. Each subclass are saved in seperate file and all my
subclasses and parent class are placed in the same folder.
>
The parent class is subclass of wx.Frame, and subclasses are subclass
of wx.Panel. Each subclass will create a GUI for each task..
>
ok.. here is problem
>
When a menu is selected in the parent class, im instantiating the child
class(i.e, Panel), which has textbox and two buttons. first button is
used to select a file, and second one I have planned to, read the file
and pass the values to parent class OR pass the filepath to
parent to read and do rest of the work.
>
How do I do that?
>
Please tell me whether I am following a correct method, by fragmenting
task into small task and assigning it to child class and saving it in
a separate file?.
>
ok, here is the Parent class

import wx
import client
"""My Parent class"""
class Parent(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, title)
>
        menu=wx.Menu()
        menu.Append(5000, "File")
        menu.AppendSeparator()
        menu.Append(5001, "Exit")
        menubar=wx.MenuBar()
        menubar.Append(menu, "File")
        self.SetMenuBar(menubar)
        self.Bind(wx.EVT_MENU, self.OnFile,id=5000)
        self.Bind(wx.EVT_MENU, self.OnExit,id=5001)
>
    def OnFile(self, event):
        self.cl=client.Child(self, -1)
>
    def OnBrowse(self, event):
        dir=""
        d=x.FileDialog(self, "Choose an Excel file", self.dirname, "",
"*.xls", wx.OPEN)
        if d.ShowModal() == wx.ID_OK:
            self.filename=d.GetFilename()
            self.dirname=d.GetDirectory()
            self.filepath.SetValue(os.path.join(self.dirname,
self.filename))
>
    def OnUpload(self, event):
        pass
>
    def OnExit(self, event):
        self.Close()
>
class MyApp(wx.App):
    def OnInit(self):
        frame=Parent(None, -1, "Parent window")
        frame.Show(True)
        self.SetTopWindow(frame)
        return True
>
if __name__ == '__main__':
    app=MyApp(redirect=False)
    app.MainLoop()
>

>
and Child class

import wx, os
>
"""My Child class"""
>
class Child(wx.Panel):
    def __init__(self, parent, id):
        wx.Panel.__init__(self, parent, id, size=(300,300))
        box=wx.BoxSizer(wx.HORIZONTAL)
        label=wx.StaticText(self, -1, "File Path:  ")
>
        self.text=wx.TextCtrl(self, -1)
        browse=wx.Button(self, -1,"Browse")
        upload=wx.Button(self, -1, "Upload")
        self.Bind(wx.EVT_BUTTON, self.OnBrowse, browse)
        self.Bind(wx.EVT_BUTTON, self.OnUpload, upload)
        box.Add(label)
        box.Add(self.text)
        box.Add(browse)
>
        mainbox=wx.BoxSizer(wx.VERTICAL)
        mainbox.Add(box)
        mainbox.Add(upload)
>
        self.SetSizer(mainbox)
        mainbox.Layout()
    def OnBrowse(self, event):
        self.dir=""
        d=wx.FileDialog(self, "Choose an Excel file", self.dir, "",
"*.xls", wx.OPEN)
        if d.ShowModal() == wx.ID_OK:
            self.filename=d.GetFilename()
            self.dir=d.GetDirectory()
            self.text.SetValue(os.path.join(self.dir, self.filename))
>
    def OnUpload(self, event):
        pass
>
class MyApp(wx.App):
    def OnInit(self):
        frame=wx.Frame(None, -1, "Child window")
        panel=Child(frame, -1)
        frame.Show(True)
        self.SetTopWindow(frame)
        return True
>
if __name__ == '__main__':
    app=MyApp()
    app.MainLoop()

>
thank you,
regards,
kath.
>

You might consider doing it the same way wx passes things around.
When you instantiate the subclass pass the parent class' instance
as first argument to __init__ method. That way the subclass can
easily pass values back to the parent by using that pointer.

-Larry

[kath]

Re: how do I pass values between classes?

hi, Larry Bates .... thanks for the reply...

You might consider doing it the same way wx passes things around.
When you instantiate the subclass pass the parent class' instance
as first argument to __init__ method.

Yes thats absolutely right..

That way the subclass can
easily pass values back to the parent by using that pointer.

Could you please explain me this.. more clearly. I think it is much
close to the solution.


Thank you.
regards, sudhir

[Max Erickson]

Re: how do I pass values between classes?

"kath" <nitte.sudhir@g mail.comwrote:

hi, Larry Bates .... thanks for the reply...
>

>You might consider doing it the same way wx passes things around.
>When you instantiate the subclass pass the parent class' instance
>as first argument to __init__ method.

>
Yes thats absolutely right..
>

>That way the subclass can
>easily pass values back to the parent by using that pointer.

>
Could you please explain me this.. more clearly. I think it is much
close to the solution.
>
>
Thank you.
regards, sudhir
>

Somewhere in the child class:

self.parent.do_ something(somet hing_to_do_it_w ith)

[jim-on-linux]

Re: how do I pass values between classes?


Kath,
You can use this class to pass values around
without concern for conflicts since it has no
values of its own.


class Kvariable:
def setVariable(sel f, variable):
self.output = variable

def showVariable(se lf):
print self.output

x = Kvariable()
y = Kvariable()

x.setVariable(" James_01")
y.setVariable(" Kath_01")

x.showVariable( )
y.showVariable( )


x.setVariable(' 3.14159')
y.setVariable(" python.org")

x.showVariable( )
y.showVariable( )

jim-on-linux

http://www.inqvista.com














On Monday 06 November 2006 02:00, kath wrote:

hi, Larry Bates .... thanks for the reply...
>

You might consider doing it the same way wx
passes things around. When you instantiate
the subclass pass the parent class' instance
as first argument to __init__ method.

>
Yes thats absolutely right..
>

That way the subclass can
easily pass values back to the parent by
using that pointer.

>
Could you please explain me this.. more
clearly. I think it is much close to the
solution.
>
>
Thank you.
regards, sudhir

[Larry Bates]

Re: how do I pass values between classes?

kath wrote:

hi, Larry Bates .... thanks for the reply...
>

>You might consider doing it the same way wx passes things around.
>When you instantiate the subclass pass the parent class' instance
>as first argument to __init__ method.

>
Yes thats absolutely right..
>

>That way the subclass can
>easily pass values back to the parent by using that pointer.

>
Could you please explain me this.. more clearly. I think it is much
close to the solution.
>
>
Thank you.
regards, sudhir
>

Just something like:

class foo:
self.__init__(s elf, parent):
self.parent=par ent

class bar:
self.__init__(s elf, parent):
self.parent=par ent
self.foo=foo(se lf)


class myclass:
self.__init__(s elf, parent):
self.parent=par ent
self.bar=bar(se lf)

Now in foo I can reference things from myclass easily
self.parent.par ent. Or setattr(self.pa rent.parent, value).

Hope this helps.

-Larry