QtLELEdit.qo.h

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//# QtLEL.qo.h: Helper class for viewer data manager widget (QtDataManager).
//# Copyright (C) 2005
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef QTLELEDIT_H
#define QTLELEDIT_H

#include <casa/aips.h>

#include <graphics/X11/X_enter.h>
#  include <QLineEdit>
#  include <QColor>
#include <graphics/X11/X_exit.h>

 
namespace casa { //# NAMESPACE CASA - BEGIN


class QtLELEdit : public QLineEdit {
  //# Used within QtDataManager's designer-created gui (QtDataManager.ui[.h]).
  //# A QLineEdit which also signals whenever it gets focus.
   
  Q_OBJECT
 
 
 public:
 
  QtLELEdit(QWidget* parent=0) : QLineEdit(parent) {
    
    inactivePalette_ = activePalette_ = palette();
    
    //# The inactive pallette shows text in the 'disabled' color, even
    //# if the edit widget is not really disabled.  This is to provide
    //# feedback that the LEL expression is / is not being used.
    
    QColor dsbldText = palette().color(QPalette::Disabled, QPalette::Text);
    inactivePalette_.setColor(QPalette::Active, QPalette::Text, dsbldText);
    inactivePalette_.setColor(QPalette::Inactive, QPalette::Text, dsbldText);

    deactivate();  }
     
  
  Bool isActive() { return active_;  }
 
 
 signals:
 
  void gotFocus(QFocusEvent* ev);

 
 public slots:
 
  virtual void  activate() {
    setPalette(activePalette_);
    active_ = True;  }
  
  virtual void deactivate() {
    setPalette(inactivePalette_);
    active_ = False;  }
  
   
  
 protected slots:
  
  virtual void focusInEvent(QFocusEvent* ev) {
    QLineEdit::focusInEvent(ev);
    activate();
    emit gotFocus(ev);  }

    
 protected:
 
  QPalette activePalette_;
  QPalette inactivePalette_;
  Bool active_;
     
};



} //# NAMESPACE CASA - END

#endif