"""
A log window, for displaying stdout/stderr stuff from Necrofamicon.
"""
import wx
import wx

class Log(wx.stc.StyledTextCtrl):
    """
    Subclass the StyledTextCtrl to provide  additions
    and initializations to make it useful as a log window.

    """
    def __init__(self, Parent, Style = wx.SIMPLE_BORDER):
        """
        Constructor
        
        """
        stc.StyledTextCtrl.__init__(self, Parent, style = Style)
        self._styles = [None]*32
        self._free = 1
    def GetStyle(self, c='black'):
        """
        Returns a style for a given colour if one exists.  If no style
        exists for the colour, make a new style.
        
        If we run out of styles, (only 32 allowed here) we go to the top
        of the list and reuse previous styles.
        """
        free = self._free
        if c and isinstance(c, (str, unicode)):
            c = c.lower()
        else:
            c = 'black'
        try:
            style = self._styles.index(c)
            return style
        except ValueError:
            style = free
            self._styles[style] = c
            self.StyleSetForeground(style, wx.NamedColour(c))
            free += 1
            if free >31:
                free = 0
            self._free = free
            return style
    def write(self, Text, c = None):
        """
        Add the text to the end of the control using colour c which
        should be suitable for feeding directly to wx.NamedColour.
        
        'text' should be a unicode string or contain only ascii data.
        """
        Style = self.GetStyle(c)
        TextLength = len(text.encode('utf8'))
        End = self.GetLength()
        self.AddText(Text)
        self.StartStyling(End, 31)
        self.SetStyling(TextLength, Style)
        self.EnsureCaretVisible()
    __call__ = write