/**
 * $Id: mxCellState.js,v 1.42 2012-03-19 10:47:08 gaudenz Exp $
 * Copyright (c) 2006-2010, JGraph Ltd
 */
/**
 * Class: mxCellState
 * 
 * Represents the current state of a cell in a given <mxGraphView>.
 * 
 * For edges, the edge label position is stored in <absoluteOffset>.
 * 
 * The size for oversize labels can be retrieved using the boundingBox property
 * of the <text> field as shown below.
 * 
 * (code)
 * var bbox = (state.text != null) ? state.text.boundingBox : null;
 * (end)
 * 
 * Constructor: mxCellState
 * 
 * Constructs a new object that represents the current state of the given
 * cell in the specified view.
 * 
 * Parameters:
 * 
 * view - <mxGraphView> that contains the state.
 * cell - <mxCell> that this state represents.
 * style - Array of key, value pairs that constitute the style.
 */
function mxCellState(view, cell, style)
{
	this.view = view;
	this.cell = cell;
	this.style = style;
	
	this.origin = new mxPoint();
	this.absoluteOffset = new mxPoint();
};

/**
 * Extends mxRectangle.
 */
mxCellState.prototype = new mxRectangle();
mxCellState.prototype.constructor = mxCellState;

/**
 * Variable: view
 * 
 * Reference to the enclosing <mxGraphView>.
 */
mxCellState.prototype.view = null;

/**
 * Variable: cell
 *
 * Reference to the <mxCell> that is represented by this state.
 */
mxCellState.prototype.cell = null;

/**
 * Variable: style
 * 
 * Contains an array of key, value pairs that represent the style of the
 * cell.
 */
mxCellState.prototype.style = null;

/**
 * Variable: invalid
 * 
 * Specifies if the state is invalid. Default is true.
 */
mxCellState.prototype.invalid = true;

/**
 * Variable: invalidOrder
 * 
 * Specifies if the cell has an invalid order. For internal use. Default is
 * false.
 */
mxCellState.prototype.invalidOrder = false;

/**
 * Variable: orderChanged
 * 
 * Specifies if the cell has changed order and the display needs to be
 * updated.
 */
mxCellState.prototype.orderChanged = false;

/**
 * Variable: origin
 *
 * <mxPoint> that holds the origin for all child cells. Default is a new
 * empty <mxPoint>.
 */
mxCellState.prototype.origin = null;

/**
 * Variable: absolutePoints
 * 
 * Holds an array of <mxPoints> that represent the absolute points of an
 * edge.
 */
mxCellState.prototype.absolutePoints = null;

/**
 * Variable: absoluteOffset
 *
 * <mxPoint> that holds the absolute offset. For edges, this is the
 * absolute coordinates of the label position. For vertices, this is the
 * offset of the label relative to the top, left corner of the vertex. 
 */
mxCellState.prototype.absoluteOffset = null;

/**
 * Variable: visibleSourceState
 * 
 * Caches the visible source terminal state.
 */
mxCellState.prototype.visibleSourceState = null;

/**
 * Variable: visibleTargetState
 * 
 * Caches the visible target terminal state.
 */
mxCellState.prototype.visibleTargetState = null;

/**
 * Variable: terminalDistance
 * 
 * Caches the distance between the end points for an edge.
 */
mxCellState.prototype.terminalDistance = 0;

/**
 * Variable: length
 *
 * Caches the length of an edge.
 */
mxCellState.prototype.length = 0;

/**
 * Variable: segments
 * 
 * Array of numbers that represent the cached length of each segment of the
 * edge.
 */
mxCellState.prototype.segments = null;

/**
 * Variable: shape
 * 
 * Holds the <mxShape> that represents the cell graphically.
 */
mxCellState.prototype.shape = null;

/**
 * Variable: text
 * 
 * Holds the <mxText> that represents the label of the cell. Thi smay be
 * null if the cell has no label.
 */
mxCellState.prototype.text = null;

/**
 * Function: getPerimeterBounds
 * 
 * Returns the <mxRectangle> that should be used as the perimeter of the
 * cell.
 * 
 * Parameters:
 * 
 * border - Optional border to be added around the perimeter bounds.
 * bounds - Optional <mxRectangle> to be used as the initial bounds.
 */
mxCellState.prototype.getPerimeterBounds = function (border, bounds)
{
	border = border || 0;
	bounds = (bounds != null) ? bounds : new mxRectangle(this.x, this.y, this.width, this.height);
	
	if (this.shape != null && this.shape.stencil != null)
	{
		var aspect = this.shape.stencil.computeAspect(this, bounds, null);
		
		bounds.x = aspect.x;
		bounds.y = aspect.y;
		bounds.width = this.shape.stencil.w0 * aspect.width;
		bounds.height = this.shape.stencil.h0 * aspect.height;
	}
	
	if (border != 0)
	{
		bounds.grow(border);
	}
	
	return bounds;
};

/**
 * Function: setAbsoluteTerminalPoint
 * 
 * Sets the first or last point in <absolutePoints> depending on isSource.
 * 
 * Parameters:
 * 
 * point - <mxPoint> that represents the terminal point.
 * isSource - Boolean that specifies if the first or last point should
 * be assigned.
 */
mxCellState.prototype.setAbsoluteTerminalPoint = function (point, isSource)
{
	if (isSource)
	{
		if (this.absolutePoints == null)
		{
			this.absolutePoints = [];
		}
		
		if (this.absolutePoints.length == 0)
		{
			this.absolutePoints.push(point);
		}
		else
		{
			this.absolutePoints[0] = point;
		}
	}
	else
	{
		if (this.absolutePoints == null)
		{
			this.absolutePoints = [];
			this.absolutePoints.push(null);
			this.absolutePoints.push(point);
		}
		else if (this.absolutePoints.length == 1)
		{
			this.absolutePoints.push(point);
		}
		else
		{
			this.absolutePoints[this.absolutePoints.length - 1] = point;
		}
	}
};

/**
 * Function: setCursor
 * 
 * Sets the given cursor on the shape and text shape.
 */
mxCellState.prototype.setCursor = function (cursor)
{
	if (this.shape != null)
	{
		this.shape.setCursor(cursor);
	}
	
	if (this.text != null)
	{
		this.text.setCursor(cursor);
	}
};

/**
 * Function: getVisibleTerminal
 * 
 * Returns the visible source or target terminal cell.
 * 
 * Parameters:
 * 
 * source - Boolean that specifies if the source or target cell should be
 * returned.
 */
mxCellState.prototype.getVisibleTerminal = function (source)
{
	var tmp = this.getVisibleTerminalState(source);
	
	return (tmp != null) ? tmp.cell : null;
};

/**
 * Function: getVisibleTerminalState
 * 
 * Returns the visible source or target terminal state.
 * 
 * Parameters:
 * 
 * source - Boolean that specifies if the source or target state should be
 * returned.
 */
mxCellState.prototype.getVisibleTerminalState = function (source)
{
	return (source) ? this.visibleSourceState : this.visibleTargetState;
};

/**
 * Function: setVisibleTerminalState
 * 
 * Sets the visible source or target terminal state.
 * 
 * Parameters:
 * 
 * terminalState - <mxCellState> that represents the terminal.
 * source - Boolean that specifies if the source or target state should be set.
 */
mxCellState.prototype.setVisibleTerminalState = function (terminalState, source)
{
	if (source)
	{
		this.visibleSourceState = terminalState;
	}
	else
	{
		this.visibleTargetState = terminalState;
	}
};

/**
 * Destructor: destroy
 * 
 * Destroys the state and all associated resources.
 */
mxCellState.prototype.destroy = function ()
{
	this.view.graph.cellRenderer.destroy(this);
};

/**
 * Function: clone
 *
 * Returns a clone of this <mxPoint>.
 */
mxCellState.prototype.clone = function()
{
 	var clone = new mxCellState(this.view, this.cell, this.style);

	// Clones the absolute points
	if (this.absolutePoints != null)
	{
		clone.absolutePoints = [];
		
		for (var i = 0; i < this.absolutePoints.length; i++)
		{
			clone.absolutePoints[i] = this.absolutePoints[i].clone();
		}
	}

	if (this.origin != null)
	{
		clone.origin = this.origin.clone();
	}

	if (this.absoluteOffset != null)
	{
		clone.absoluteOffset = this.absoluteOffset.clone();
	}

	if (this.boundingBox != null)
	{
		clone.boundingBox = this.boundingBox.clone();
	}

	clone.terminalDistance = this.terminalDistance;
	clone.segments = this.segments;
	clone.length = this.length;
	clone.x = this.x;
	clone.y = this.y;
	clone.width = this.width;
	clone.height = this.height;
	
	return clone;
};