attr_dialog.py

import wx


class AttrDialog(wx.Dialog):

    def __init__(self, xml_obj):
        wx.Dialog.__init__(self, None, title='Add Attribute')
        self.xml_obj = xml_obj

        lbl_sizer = wx.BoxSizer(wx.HORIZONTAL)
        attr_sizer = wx.BoxSizer(wx.HORIZONTAL)
        btn_sizer = wx.BoxSizer(wx.HORIZONTAL)
        main_sizer = wx.BoxSizer(wx.VERTICAL)

        attr_lbl = wx.StaticText(self, label='Attribute')
        lbl_sizer.Add(attr_lbl, 0, wx.ALL, 5)
        lbl_sizer.AddSpacer((140, -1))
        value_lbl = wx.StaticText(self, label='Value')
        lbl_sizer.Add(value_lbl, 0, wx.ALL, 5)

        self.attr_text = wx.TextCtrl(self)
        attr_sizer.Add(self.attr_text, 1, wx.ALL, 5)
        self.value_text = wx.TextCtrl(self)
        attr_sizer.Add(self.value_text, 1, wx.ALL, 5)

        save_btn = wx.Button(self, label='Save')
        save_btn.Bind(wx.EVT_BUTTON, self.on_save)
        btn_sizer.Add(save_btn, 0, wx.ALL|wx.CENTER, 5)

        cancel_btn = wx.Button(self, label='Cancel')
        cancel_btn.Bind(wx.EVT_BUTTON, self.on_cancel)
        btn_sizer.Add(cancel_btn, 0, wx.ALL|wx.CENTER, 5)
        main_sizer.Add(btn_sizer, 0, wx.CENTER)

        main_sizer.Add(lbl_sizer)
        main_sizer.Add(attr_sizer, 0, wx.EXPAND)
        main_sizer.Add(btn_sizer, 0, wx.CENTER)
        self.SetSizer(main_sizer)

        self.ShowModal()

    def on_cancel(self, event):
        """
        Event handler that is called when the Cancel button is
        pressed.

        Will destroy the dialog
        """
        self.Destroy()

    def on_save(self, event):
        """
        Event handler that is called when the Save button is
        pressed.

        Updates the XML object with the new node element and
        tells the UI to update to display the new element
        before destroying the dialog
        """
        attr = self.attr_text.GetValue()
        value = self.value_text.GetValue()
        if attr or value:
            self.xml_obj.attrib[attr] = value
        self.Destroy()

main.py

import attr_dialog
import wx

class MainFrame(wx.Frame):

    def __init__(self):
        wx.Frame.__init__(self, None, title='Test')
        panel = wx.Panel(self)

        btn = wx.Button(panel, label='Attr')
        btn.Bind(wx.EVT_BUTTON, self.on_attr)

    def on_attr(self, event):
        dlg = attr_dialog.AttrDialog(xml_obj='')

if __name__ == '__main__':
    app = wx.App(False)
    frame = MainFrame()
    frame.Show()
    app.MainLoop()