webgui/www/extras/yui/examples/dragdrop/js/DDPlayer.js

/* Copyright (c) 2006 Yahoo! Inc. All rights reserved. */

/////////////////////////////////////////////////////////////////////////

/**
 * @class a YAHOO.util.DDFramed implementation. During the drag over event, the
 * dragged element is inserted before the dragged-over element.
 *
 * @extends YAHOO.util.DDProxy
 * @constructor
 * @param {String} id the id of the linked element
 * @param {String} sGroup the group of related DragDrop objects
 */
YAHOO.example.DDPlayer = function(id, sGroup, config) {
    this.initPlayer(id, sGroup);
};

// YAHOO.example.DDPlayer.prototype = new YAHOO.util.DDProxy();
YAHOO.extend(YAHOO.example.DDPlayer, YAHOO.util.DDProxy);

YAHOO.example.DDPlayer.TYPE = "DDPlayer";

YAHOO.example.DDPlayer.prototype.initPlayer = function(id, sGroup, config) {
    if (!id) { return; }

    this.init(id, sGroup, config);
    this.initFrame();

    this.logger = this.logger || YAHOO;
    var s = this.getDragEl().style;
    s.borderColor = "transparent";
    // s.backgroundColor = "#cccccc";
    s.opacity = 0.76;
    s.filter = "alpha(opacity=76)";

    // specify that this is not currently a drop target
    this.isTarget = false;

    this.originalStyles = [];

    this.type = YAHOO.example.DDPlayer.TYPE;
    this.slot = null;

    this.startPos = YAHOO.util.Dom.getXY( this.getEl() );
    this.logger.log(id + " startpos: " + this.startPos);
};

YAHOO.example.DDPlayer.prototype.startDrag = function(x, y) {
    this.logger.log(this.id + " startDrag");

    var dragEl = this.getDragEl();
    var clickEl = this.getEl();

    dragEl.innerHTML = clickEl.innerHTML;
    dragEl.className = clickEl.className;
    dragEl.style.color = this.DDM.getStyle(clickEl, "color");;
    dragEl.style.backgroundColor = this.DDM.getStyle(clickEl, "backgroundColor");

    var s = clickEl.style;
    s.opacity = .1;
    s.filter = "alpha(opacity=10)";

    var targets = YAHOO.util.DDM.getRelated(this, true);
    this.logger.log(targets.length + " targets");
    for (var i=0; i<targets.length; i++) {
        
        var targetEl = this.getTargetDomRef(targets[i]);

        if (!this.originalStyles[targetEl.id]) {
            this.originalStyles[targetEl.id] = targetEl.className;
        }

        targetEl.className = "target";
    }
};

YAHOO.example.DDPlayer.prototype.getTargetDomRef = function(oDD) {
    if (oDD.player) {
        return oDD.player.getEl();
    } else {
        return oDD.getEl();
    }
};

YAHOO.example.DDPlayer.prototype.endDrag = function(e) {
    // reset the linked element styles
    var s = this.getEl().style;
    s.opacity = 1;
    s.filter = "alpha(opacity=100)";

    this.resetTargets();
};

YAHOO.example.DDPlayer.prototype.resetTargets = function() {

    // reset the target styles
    var targets = YAHOO.util.DDM.getRelated(this, true);
    for (var i=0; i<targets.length; i++) {
        var targetEl = this.getTargetDomRef(targets[i]);
        var oldStyle = this.originalStyles[targetEl.id];
        if (oldStyle) {
            targetEl.className = oldStyle;
        }
    }
};

YAHOO.example.DDPlayer.prototype.onDragDrop = function(e, id) {
    // get the drag and drop object that was targeted
    var oDD;
    
    if ("string" == typeof id) {
        oDD = YAHOO.util.DDM.getDDById(id);
    } else {
        oDD = YAHOO.util.DDM.getBestMatch(id);
    }

    var el = this.getEl();

    // check if the slot has a player in it already
    if (oDD.player) {
        // check if the dragged player was already in a slot
        if (this.slot) {
            // check to see if the player that is already in the
            // slot can go to the slot the dragged player is in
            // YAHOO.util.DDM.isLegalTarget is a new method
            if ( YAHOO.util.DDM.isLegalTarget(oDD.player, this.slot) ) {
                this.logger.log("swapping player positions");
                YAHOO.util.DDM.moveToEl(oDD.player.getEl(), el);
                this.slot.player = oDD.player;
                oDD.player.slot = this.slot;
            } else {
                this.logger.log("moving player in slot back to start");
                YAHOO.util.Dom.setXY(oDD.player.getEl(), oDD.player.startPos);
                this.slot.player = null;
                oDD.player.slot = null
            }
        } else {
            // the player in the slot will be moved to the dragged
            // players start position
            oDD.player.slot = null;
            YAHOO.util.DDM.moveToEl(oDD.player.getEl(), el);
        }
    } else {
        // Move the player into the emply slot
        // I may be moving off a slot so I need to clear the player ref
        if (this.slot) {
            this.slot.player = null;
        }
    }

    YAHOO.util.DDM.moveToEl(el, oDD.getEl());
    this.resetTargets();

    this.slot = oDD;
    this.slot.player = this;
};

YAHOO.example.DDPlayer.prototype.swap = function(el1, el2) {
    var dom = YAHOO.util.Dom;
    var pos1 = dom.getXY(el1);
    var pos2 = dom.getXY(el2);
    dom.setXY(el1, pos2);
    dom.setXY(el2, pos1);
};

YAHOO.example.DDPlayer.prototype.onDragOver = function(e, id) {};

YAHOO.example.DDPlayer.prototype.onDrag = function(e, id) {};