################################################################################
#This software was developed by the University of Tennessee as part of the
#Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
#project funded by the US National Science Foundation. 
#
#See the license text in license.txt
#
#copyright 2009, University of Tennessee
################################################################################


import wx
import os
from invariant_state import InvariantState as IState
import copy

class InvTextCtrl(wx.TextCtrl):
    """
    Text control for model and fit parameters.
    Binds the appropriate events for user interactions.
    """
    def __init__(self, *args, **kwds):
        wx.TextCtrl.__init__(self, *args, **kwds)
        ## Set to True when the mouse is clicked while the whole string is selected
        self.full_selection = False
        ## Call back for EVT_SET_FOCUS events
        _on_set_focus_callback = None

        # Bind appropriate events
        self.Bind(wx.EVT_LEFT_UP, self._highlight_text)
        self.Bind(wx.EVT_SET_FOCUS, self._on_set_focus)
        
    def _on_set_focus(self, event):
        """
        Catch when the text control is set in focus to highlight the whole
        text if necessary
        
        :param event: mouse event
        """
        event.Skip()
        self.full_selection = True
        
    def _highlight_text(self, event):
        """
        Highlight text of a TextCtrl only of no text has be selected
        
        :param event: mouse event
        """
        # Make sure the mouse event is available to other listeners
        event.Skip()
        control  = event.GetEventObject()
        if self.full_selection:
            self.full_selection = False
            # Check that we have a TextCtrl
            if issubclass(control.__class__, wx.TextCtrl):
                # Check whether text has been selected, 
                # if not, select the whole string
                (start, end) = control.GetSelection()
                if start==end:
                    control.SetSelection(-1,-1)
           

    
class OutputTextCtrl(wx.TextCtrl):
    """
    Text control used to display outputs.
    No editing allowed. The background is 
    grayed out. User can't select text.
    """
    def __init__(self, *args, **kwds):
        wx.TextCtrl.__init__(self, *args, **kwds)
        self.SetEditable(False)
        self.SetBackgroundColour(self.GetParent().GetBackgroundColour())
        
        # Bind to mouse event to avoid text highlighting
        # The event will be skipped once the call-back
        # is called.
        
        self.Bind(wx.EVT_MOUSE_EVENTS, self._click)

        
    def _click(self, event):
        """
        Prevent further handling of the mouse event
        by not calling Skip().
        """ 
        pass