/** @file
* Copyright (C) 2004–5 John D Lamb (J.D.Lamb@btinternet.com)
* Copyright (C) 20007 John D Lamb (J.D.Lamb@btinternet.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package jscicalc.button;
import jscicalc.CalculatorApplet;
import jscicalc.pobject.*;
import jscicalc.complex.Complex;
import jscicalc.OObject;
/**
* Button to subtract from memory. This class could probably be better derived from
* EqualsButton.
*
* @author J. D. Lamb
* @version $Revision: 1.6 $
*/
public class MminusButton extends CalculatorButton {
/**
* Constructor. Sets PObject to Mminus.
* @param applet The <em>controller</em> object.
*/
public MminusButton( CalculatorApplet applet ){
this.applet = applet;
this.pobject = new Mminus();
setText();
setTextSize();
tooltip = "subtracts current expression or most<br>recent " +
"result from memory value";
shortcut = 'M';
setToolTipText();
addActionListener( this );
}
/**
* Evaluates the current expression and subtracts the value from memory.
* @param actionEvent The event that generated this method call: usually a button
* press or called when CalculatorApplet responded to the key associated with
* this button
*/
public void actionPerformed( java.awt.event.ActionEvent actionEvent ){
synchronized( applet ){
if( getApplet().getMode() != 0 ){
getApplet().setMode( pobject );
getApplet().requestFocusInWindow();
return;
}
OObject m = getApplet().getMemory();
getApplet().pushHistory();
OObject o = getApplet().getValue();
if( !getApplet().getParser().isEmpty() ){
//System.out.println( "__________" );
PObject p = getApplet().getParser().getLast();
if( !(o instanceof jscicalc.Error) && ( p instanceof RFunction ||
p instanceof DFunction ||
p instanceof MFunction ||
p instanceof AFunction ) ){
Ans ans = new Ans();
ans.setValue( o );
getApplet().insert( ans );
getApplet().updateDisplay( true, true );
}
} else {
//System.out.println( "**********" );
Ans ans = new Ans();
ans.setValue( o );
getApplet().insert( ans );
getApplet().updateDisplay( true, true );
}
o = getApplet().getParser().evaluate( getApplet().getAngleType() );
if( !(o instanceof jscicalc.Error) ){
OObject q = m.subtract( o );
if( !(q instanceof jscicalc.Error) )
getApplet().setMemory( q );
getApplet().setValue( o );
getApplet().updateDisplay( false, true );
}
getApplet().setShift( false );
getApplet().newExpression();
getApplet().requestFocusInWindow();
}
}
private static final long serialVersionUID = 1L;
}