/*
	autor: Wesley Barbaresco
	email: wbarbaresco@gmail.com
	data: 23/11/2008
*/

function CampoMoeda(){
	
	this.onClick = function( campo ){
		this.posicionarPonteiro(campo);
	}
	
	this.formatarValor = function( campo ){
		campo.value = campo.value.replace('.', '');
		campo.value = campo.value.replace(',', '');
		switch( campo.value.length ){
			case 0 :
				campo.value = '0.00';
				break;
			case 1 : 
				campo.value = '0.0' + campo.value;
				break
			case 2  : 
				campo.value = '0.' + campo.value;
				break;
			default: 
				// remover 0 a esquerda
				while( campo.value.length > 3 && campo.value.substring(0,1) == '0' ){
					campo.value = campo.value.substring(1, campo.value.length );
				}
				
				campo.value = 
					campo.value.substring(0, campo.value.length-2 ) + 
					'.' + 
					campo.value.substring(campo.value.length-2, campo.value.length )
				break;
		}
	}
	
	this.getAsc = function( keyCode ){
		var chr = '';
		switch(keyCode) {
			case 48: case 96: // 0 and numpad 0
				chr = '0';
				break;
			case 49: case 97: // 1 and numpad 1
				chr = '1';
				break;
			case 50: case 98: // 2 and numpad 2
				chr = '2';
				break;
			case 51: case 99: // 3 and numpad 3
				chr = '3';
				break;
			case 52: case 100: // 4 and numpad 4
				chr = '4';
				break;
			case 53: case 101: // 5 and numpad 5
				chr = '5';
				break;
			case 54: case 102: // 6 and numpad 6
				chr = '6';
				break;
			case 55: case 103: // 7 and numpad 7
				chr = '7';
				break;
			case 56: case 104: // 8 and numpad 8
				chr = '8';
				break;
			case 57: case 105: // 9 and numpad 9
				chr = '9';
				break;
		}
		return chr;
	}
	
	this.onMouseUp = function( campo ){
		this.posicionarPonteiro(campo);
	}
	
	this.onKeyDown = function( campo, event ){
		
		var keyCode = event.which || event.keyCode;
		switch( keyCode ){
			case 27:
				campo.value = '0.00';
				this.cancelarEvento(event);
				break;
			case 36: // Home
			case 35: // End
			case 37: // Left
			case 38: // Up
			case 39: // Right
			case 40: // Down
				this.cancelarEvento(event);
				this.posicionarPonteiro( campo );
				break;
			
			case 8 :  // backspace
			case 46 :  // delete 
					this.retirarNumero(campo);
					this.formatarValor( campo );
					this.cancelarEvento(event);
					this.posicionarPonteiro( campo );
				break;
			case 48: case 96: // 0 and numpad 0
			case 49: case 97: // 1 and numpad 1
			case 50: case 98: // 2 and numpad 2
			case 51: case 99: // 3 and numpad 3
			case 52: case 100: // 4 and numpad 4
			case 53: case 101: // 5 and numpad 5
			case 54: case 102: // 6 and numpad 6
			case 55: case 103: // 7 and numpad 7
			case 56: case 104: // 8 and numpad 8
			case 57: case 105: // 9 and numpad 9
				campo.value = campo.value + this.getAsc( keyCode );
				this.formatarValor( campo );							
				this.cancelarEvento(event);
				this.posicionarPonteiro( campo );
				break;
			default:
				this.cancelarEvento(event);
				this.posicionarPonteiro(campo);
		}
	}
	
	this.posicionarPonteiro = function( campo ){
		var r = campo.createTextRange();
		r.collapse();
		r.moveStart("character", campo.value.length);
		r.moveEnd("character", campo.value.length);
		r.select();
	}
	
	this.retirarNumero = function( campo ){
		campo.value = campo.value.substring(0, (campo.value.length - 1));
	}
	
	this.cancelarEvento = function( event ){
		if (event.stopPropagation) 
			event.stopPropagation();
		else 
			event.cancelBubble = true;

		if (event.preventDefault)
			event.preventDefault();
		else 
			event.returnValue = false;	
	}
}

var campoMoeda = new CampoMoeda();