gistfile1.txt

import <Foundation/CPObject.j>

@implementation CalculatorLogic : CPObject
{
	CPNumber currentValue;
	CPString acumulatedValue;
	var decimalPointActive;
	//1 * 0.1 * 0.1 in Js = 0.010000000000000002 :) Strings never fails!!!
	 id changeValueNotifyDelegate;
}

- (id)init
{
	self = [super init];
    if (self)
    {
		currentValue = [[CPString alloc] init];
		acumulatedValue = [[CPNumber alloc] initWithInt:0];
		decimalPointActive = NO;
	}
	return self;
}

-(void)setNotifyInstance:(id)aInstance
{
	changeValueNotifyDelegate = aInstance;
}

-(void)notifyInstance
{
	if ([changeValueNotifyDelegate respondsToSelector:@selector(displayValueChanged:)])
	{
		[changeValueNotifyDelegate displayValueChanged:[self getCurrentValue]];
	}
}

-(CPString)getCurrentValue
{
	return currentValue;
}

-(void)press: (id)sender
{
    var value = [sender objectValue];

    if (value == "." && decimalPointActive == NO)
	decimalPointActive = YES;

	if (([currentValue length] != 0) || ([value isEqualToString:"0"] == NO))
	{
		currentValue = currentValue + value;
		[self notifyInstance];
	}
	
}

@end