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