instruction.cpp

嵌入式Qt下的一个计算器源码

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** Copyright (C) 2000-2006 TROLLTECH ASA. All rights reserved.
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** This file is part of the Phone Edition of the Qtopia Toolkit.
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#include "instruction.h"
#include "engine.h"


Instruction::Instruction() {
    precedence = 0;
    name = type = retType = "NULL";
    argCount = 0;
    cache = 0;
}

Instruction::~Instruction() {
    delete cache;
};
void Instruction::eval(){qWarning("empty instruction called");}

QPixmap* Instruction::draw() {
    if (!cache) {
	QFont myFont = QFont( "helvetica", 24, QFont::Bold );
	QRect bRect = QFontMetrics(myFont).boundingRect(0,0,240,20,Qt::AlignLeft,displayString);
	cache = new QBitmap(bRect.size());
        cache->clear();
	QPainter p(cache);
	p.setPen(Qt::color1);
	p.setFont(myFont);
	p.drawText(0,0,bRect.width(),bRect.height(),Qt::AlignRight,displayString);
    }
    return cache;
}