#!/usr/bin/env python
# -*- coding: utf-8 -*-

import wx
import wx.stc

if wx.Platform == '__WXMSW__':
    faces = { 'times': 'Times New Roman',
              'mono' : 'Courier New',
              'helv' : 'Arial',
              'other': 'Comic Sans MS',
              'size' : 10,
             }
else:
    faces = { 'times': 'Times',
              'mono' : 'Courier',
              'helv' : 'Helvetica',
              'other': 'new century schoolbook',
              'size' : 12,
             }

NAVIGATION_KEYS = [
    wx.WXK_END,
    wx.WXK_HOME,
    wx.WXK_LEFT,
    wx.WXK_UP,
    wx.WXK_RIGHT,
    wx.WXK_DOWN,
    wx.WXK_PAGEUP,
    wx.WXK_PAGEDOWN,
    wx.WXK_NUMPAD_HOME,
    wx.WXK_NUMPAD_LEFT,
    wx.WXK_NUMPAD_UP,
    wx.WXK_NUMPAD_RIGHT,
    wx.WXK_NUMPAD_DOWN,
    wx.WXK_NUMPAD_PAGEUP,
    wx.WXK_NUMPAD_PAGEDOWN,
    wx.WXK_NUMPAD_END]

def GetCursorPos(old, new):
    if old == "":
        return 0
    old_length = len(old)
    new_length = len(new)
    common_length = min(old_length, new_length)
    i = 0
    for i in xrange(common_length):
        if old[i] != new[i]:
            break
    if old_length < new_length:
        if common_length > 0 and old[i] != new[i]:
            return i + new_length - old_length
        else:
            return i + new_length - old_length + 1
    elif old_length > new_length or i < min(old_length, new_length) - 1:
        if common_length > 0 and old[i] != new[i]:
            return i
        else:
            return i + 1
    else:
        return None

class CustomStyledTextCtrl(wx.stc.StyledTextCtrl):
    
    def __init__(self, *args, **kwargs):
        wx.stc.StyledTextCtrl.__init__(self, *args, **kwargs)
        
        self.Bind(wx.EVT_MOTION, self.OnMotion)
        
    def OnMotion(self, event):
        if wx.Platform == '__WXMSW__':
            if not event.Dragging():
                x, y = event.GetPosition()
                margin_width = reduce(
                        lambda x, y: x + y,
                        [self.GetMarginWidth(i)
                         for i in xrange(3)],
                        0)
                if x <= margin_width:
                    self.SetCursor(wx.StockCursor(wx.CURSOR_ARROW))
                else:
                    self.SetCursor(wx.StockCursor(wx.CURSOR_IBEAM))
            else:
                event.Skip()
        else:
            event.Skip()

    def AppendText(self, text):
        self.GotoPos(self.GetLength())
        self.AddText(text)