# Software License Agreement (BSD License)
#
# Copyright (c) 2009, Willow Garage, Inc.
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#
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# modification, are permitted provided that the following conditions
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#  * Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
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#    with the distribution.
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import wx

class BaseFrame(wx.Frame):
    """
    A Frame that can save/load its position and size. 
    """
    def __init__(self, parent, config_name, config_key, id=wx.ID_ANY, title='Untitled', pos=wx.DefaultPosition, size=(800, 300), style=wx.DEFAULT_FRAME_STYLE):
        wx.Frame.__init__(self, parent, id, title, pos, size, style)

        self._config     = wx.Config(config_name)
        self._config_key = config_key

        self._load_config()
        
        self.Bind(wx.EVT_CLOSE, self._on_close)

    def _on_close(self, event):
        self._save_config()

        self.Destroy()

    def _load_config(self):
        """
        Load position and size of the frame from config
        """
        (x, y), (width, height) = self.Position, self.Size
        if self._config.HasEntry(self._config_x):      x      = self._config.ReadInt(self._config_x)
        if self._config.HasEntry(self._config_y):      y      = self._config.ReadInt(self._config_y)
        if self._config.HasEntry(self._config_width):  width  = self._config.ReadInt(self._config_width)
        if self._config.HasEntry(self._config_height): height = self._config.ReadInt(self._config_height)       

        self.Position = (x, y)
        self.Size = (width, height)

    def _save_config(self):
        """
        Save position and size of frame to config
        """
        (x, y), (width, height) = self.Position, self.Size
        
        self._config.WriteInt(self._config_x,      x)
        self._config.WriteInt(self._config_y,      y)
        self._config.WriteInt(self._config_width,  width)
        self._config.WriteInt(self._config_height, height)       
        self._config.Flush()

    @property
    def _config_x(self): return self._config_property('X')

    @property
    def _config_y(self): return self._config_property('Y')

    @property
    def _config_width(self): return self._config_property('Width')

    @property
    def _config_height(self): return self._config_property('Height')

    def _config_property(self, property): return '/%s/%s' % (self._config_key, property)
