Announcing Layout by Code for Python

From: Jamal Mazrui <empower@xxxxxxxxx>
To: ProgrammingBlind@xxxxxxxxxxxxx
Date: Wed, 7 Jan 2009 16:07:05 -0500 (EST)
From the archive at
http://EmpowermentZone.com/pyLbc.zip

I have developed a Python module called Layout by Code (lbc), which
simplifies design of dialogs with the wxPython package available from
http://wxPython.org

This is another implementation of the Layout by Code approach that I
originally developed for the AutoIt language,
http://EmpowermentZone.com/lbc.zip

Although the Python version is not as flexible, it is still intended to
support most dialogs one might need (based on years of experience with
various applications and languages).  It should work with Python 2.4, 2.5,
or 2.6.

After instantiating an lbc dialog object, any of the following controls
may be added with a line of code:  Button, CheckBox, ListBox, RadioButton,
RichEdit, StaticText, or TextCtrl.  The control is added to a horizontal
band of controls, with layout automatically managed by wxSizer containers.
Adding a new band is analagous to pressing carriage return at the end of a
line.

The lbc ShowModal method adds a band of buttons at the bottom of the
dialog before invoking it.  The method returns the ID of the button that
ended the dialog.  At that point, the dialog object has a list attribute
called Controls, containing the names of controls that were added to the
dialog before it was invoked.  A control name is its class and label, if
any, seperated by an underscore, e.g., Button_OK.  The dialog also has a
dictionary attribute called Results, containing the control names and
values when the dialog ended.

Over ten convenience dialogs have been defined using lbc, illustrated with
the program test_lbc.py.  Also, a fruit basket program is in lbc_fruit.py.

Below is a summary of lbc functions, followed by the fruit basket example.

Jamal

DialogBrowseForFolder(message='', value='') -- Select a folder

DialogChoose(title='Choose', message = '', names=[]) -- Choose a button

DialogConfirm(title='Confirm', message='', value='Y') -- Choose from a
Yes/No/Cancel message box

DialogInput(title='Input', label='', value='', ) -- Input with a
single-line edit box

DialogMemo(title='Memo', label='', value='', readonly=False) -- Input or
read text with a multiple-line edit box

DialogMultiInput(title='MultiInput', labels=[], values=[], options=[]) --
Input with multiple edit boxes

DialogMultiPick(title='Multi Pick', message='', names=[], values=[],
sort=False, index=0) -- Pick from a multiple-selection listbox

DialogOpenFile(message='', value='', wildcard='All files (*.*)|*.*') --
Specify a file to open

DialogPick(title='Pick', message='', names=[], values=[], sort=False,
index=0) -- Pick from a single-selection listbox

DialogSaveFile(message='', value='', wildcard='All files (*.*)|*.*') --
Specify a file to save

DialogShow(title='Show', message='') -- Show a message



AddBand(self)

AddButtonBand(buttons=[], handler=None)

AddButton(label='', pos=wx.DefaultPosition, size=wx.DefaultSize,
style=DEFAULT_STYLE, name='')

AddCheckBox(label='', value=False, pos=wx.DefaultPosition,
size=wx.DefaultSize, style=DEFAULT_STYLE, name='')

AddListBox(label='', names=[], values=[], sort=False,
pos=wx.DefaultPosition, size=wx.DefaultSize, style=DEFAULT_STYLE, name='')

AddRadioButton(label='', value=False, pos=wx.DefaultPosition,
size=wx.DefaultSize, style=DEFAULT_STYLE, name='')

AddRichEdit(label='', value='', readonly=False, pos=wx.DefaultPosition,
size=wx.DefaultSize, style= wx.TE_MULTILINE | wx.TE_PROCESS_ENTER |
wx.TE_RICH2, name='')

AddStaticText(label='', pos=wx.DefaultPosition, size=wx.DefaultSize,
style=DEFAULT_STYLE, name='')

AddTextCtrl(label='', value='', pos=wx.DefaultPosition,
size=wx.DefaultSize, style=DEFAULT_STYLE, name='')

ShowModal(buttons = ['OK', 'Cancel'], handler=None)

"""
Fruit basket program in Python with lbc
Public domain by Jamal Mazrui
"""

import wx, lbc

# Custom event handler
def OnEvent(dlg, event):
        if event.GetEventType() in wx.EVT_CLOSE.evtType:
                if lbc.DialogConfirm(title='Confirm', message='Exit
program?', value='Y') == 'Y': return event.Skip()
                else: return event.Veto()

        wgt = event.GetEventObject()
        txt = dlg.FindWindowByName('TextCtrl_Fruit')
        lst = dlg.FindWindowByName('ListBox_Basket')
        if wgt.GetName() == 'Button_Add':
                fruit = txt.GetValue()
                if len(fruit) == 0: return lbc.DialogShow(title='Alert',
message='No fruit to add!')
                lst.Append(fruit)
                index = lst.GetCount() - 1
                lst.SetSelection(index)
                txt.Clear()
        elif wgt.GetName() == 'Button_Delete':
                index = lst.GetSelection()
                if index == -1: return lbc.DialogShow(title='Alert',
message='No fruit to delete!')
                lst.Delete(index)
                if index == lst.GetCount(): index -= 1
                if index >= 0: lst.SetSelection(index)

# Main program
app = lbc.App()
dlg = lbc.Dialog(title='Fruit Basket')
dlg.AddTextCtrl(label='Fruit:')
dlg.AddListBox(label='Basket:')
dlg.ShowModal(buttons=['Add', 'Delete'], handler=OnEvent)
app.Exit()

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Announcing Layout by Code for Python

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