[SOLVED] Python tkinter, problem when using pack_forget to remove widget

srinietrx · 05-25-2015, 06:45 AM

Hi
I am C++ programmer new to Python.Developing graphical application using Tkinter.
As shown in screenshot
I programmed in such a way that when I press MC_CONFIG button new frame will open.
Inside that I am giving path using XML PATH button
opening and reading xml using MC_SYSTEM.xml button
After editing I gave two options

1--> OK (when Ok is pressed file is opened,xml parameters are written(we can edit) and closed with message"configuration file written successfully"
2--> Cancel(Ideally I want only the widget window where I am adding xml values need to be closed as shown in attachment.For that I used self.pack_forget()and it removes the widget and works.But when I go back and again click the button MC_CONFIG it is not opening.
Please guide me.

Code for On OK

Code:

def onOK(self): 

        # set values in xml document
        print "-------Setting Element-----------"
        for k in range(self.nac_xmlparam1_index):
            setElementValue (self.xmlDocument,self.nac_xmlparam[k],self.nac_xmlparam1[k],self.database[k].get())
            #print("self.database s"  self.database[k].get())
        
        # open XML file
        f = open ("SYSTEM.xml","w")
        #f = open (xml_path.filename,"w")

        # set xml header
        fprintf (f,'\n')
    
        # write XML document to XML file
        self.xmlDocument.writexml (f)
    
        # close XML file
        f.close ()
    
        # show confirmation message
        tkMessageBox.showerror ("Message","Configuration updated successfully")

        # exit program
        #self.quit();

Code for On Cancel

Code:

def onCancel(self): 
        # exit program
        #self.quit();
        self.pack_forget()

SoftSprocket · 05-25-2015, 10:35 AM

pack_forget removes the widget - whatever self represents here - from the display manager. To have it show again pack would have to be called.

srinietrx · 05-26-2015, 04:18 AM

Thanks SoftSProcket.
But I am still not able to figure out.Thats why I am sending entire python script

http://www.hastebin.com/ozerilogad.py

My problem comes when I follow these steps

1.Open Switch Installer Window(ie main menu in screenshot) click MainController button
2.Press MC_CONFIG button (frame1_mc_config screenshot).
3.By pressing XML PATH I select path and then I clicked MC SYSTEM.xml button (Edit_xml_frame2 screenshot)
4.Setting parameter press Ok or cancel
5.Now BACK To HOME button
6.When I again press MainController it goes to mc_config screenshot and then when clicked MC_CONFIG I cannot go to next frame.

I am trying to sort out this problem but in vain.

*Dont consider NACHandler class for time being.Only testing code with MainController

srinietrx · 05-29-2015, 07:59 AM

Solved by
1.Commenting the line tk.Frame.__init__(self)

Code:

 
def nacxml(self):
    #tk.Frame.__init__(self)
    print "===Inside Nacxml1==="

2.Controller is not intialized in self.
But it is present in def __init__(self, parent, controller):
Hence added self.controller = controller in MC_CONFIG class

Code:

class MC_CONFIG(tk.Frame):
    def __init__(self, parent, controller):
       tk.Frame.__init__(self, parent)
        print "Inside MC_CONFIG"

So can be used in below method as self.controller.show_frame(StartPage)

Code:

def nacxml(self):
    tk.Frame.__init__(self)
    print "===Inside Nacxml1==="
    # xml read,edit,widget code will be added here
    self.controller.show_frame(StartPage)