Ext.ux.Portal = Ext.extend(Ext.Panel, {
    layout: 'column',
    autoScroll: true,
    cls: 'x-portal',
    defaultType: 'portalcolumn',

    initComponent: function() {
        Ext.ux.Portal.superclass.initComponent.call(this);
        this.addEvents({
            validatedrop: true,
            beforedragover: true,
            dragover: true,
            beforedrop: true,
            drop: true
        });
    },

    initEvents: function() {
        Ext.ux.Portal.superclass.initEvents.call(this);
        this.dd = new Ext.ux.Portal.DropZone(this, this.dropConfig);
    },

    beforeDestroy: function() {
        if (this.dd) {
            this.dd.unreg();
        }
        Ext.ux.Portal.superclass.beforeDestroy.call(this);
    }
});
Ext.reg('portal', Ext.ux.Portal);


Ext.ux.Portal.DropZone = function(portal, cfg) {
    this.portal = portal;
    Ext.dd.ScrollManager.register(portal.body);
    Ext.ux.Portal.DropZone.superclass.constructor.call(this, portal.bwrap.dom, cfg);
    portal.body.ddScrollConfig = this.ddScrollConfig;
};

Ext.extend(Ext.ux.Portal.DropZone, Ext.dd.DropTarget, {
    ddScrollConfig: {
        vthresh: 50,
        hthresh: -1,
        animate: true,
        increment: 200
    },

    createEvent: function(dd, e, data, col, c, pos) {
        return {
            portal: this.portal,
            panel: data.panel,
            columnIndex: col,
            column: c,
            position: pos,
            data: data,
            source: dd,
            rawEvent: e,
            status: this.dropAllowed
        };
    },

    notifyOver: function(dd, e, data) {
        var xy = e.getXY(), portal = this.portal, px = dd.proxy;

        // case column widths
        if (!this.grid) {
            this.grid = this.getGrid();
        }

        // handle case scroll where scrollbars appear during drag
        var cw = portal.body.dom.clientWidth;
        if (!this.lastCW) {
            this.lastCW = cw;
        } else if (this.lastCW != cw) {
            this.lastCW = cw;
            portal.doLayout();
            this.grid = this.getGrid();
        }

        // determine column
        var col = 0, xs = this.grid.columnX, cmatch = false;
        for (var len = xs.length; col < len; col++) {
            if (xy[0] < (xs[col].x + xs[col].w)) {
                cmatch = true;
                break;
            }
        }
        // no match, fix last index
        if (!cmatch) {
            col--;
        }

        // find insert position
        var p, match = false, pos = 0,
            c = portal.items.itemAt(col),
            items = c.items.items, overSelf = false;

        for (var len = items.length; pos < len; pos++) {
            p = items[pos];
            var h = p.el.getHeight();
            if (h === 0) {
                overSelf = true;
            }
            else if ((p.el.getY() + (h / 2)) > xy[1]) {
                match = true;
                break;
            }
        }

        pos = (match && p ? pos : c.items.getCount()) + (overSelf ? -1 : 0);
        var overEvent = this.createEvent(dd, e, data, col, c, pos);

        if (portal.fireEvent('validatedrop', overEvent) !== false &&
           portal.fireEvent('beforedragover', overEvent) !== false) {

            // make sure proxy width is fluid
            px.getProxy().setWidth('auto');

            if (p) {
                px.moveProxy(p.el.dom.parentNode, match ? p.el.dom : null);
            } else {
                px.moveProxy(c.el.dom, null);
            }

            this.lastPos = { c: c, col: col, p: overSelf || (match && p) ? pos : false };
            this.scrollPos = portal.body.getScroll();

            portal.fireEvent('dragover', overEvent);

            return overEvent.status;
        } else {
            return overEvent.status;
        }

    },

    notifyOut: function() {
        delete this.grid;
    },

    notifyDrop: function(dd, e, data) {
        delete this.grid;
        if (!this.lastPos) {
            return;
        }
        var c = this.lastPos.c, col = this.lastPos.col, pos = this.lastPos.p;

        var dropEvent = this.createEvent(dd, e, data, col, c,
            pos !== false ? pos : c.items.getCount());

        if (this.portal.fireEvent('validatedrop', dropEvent) !== false &&
           this.portal.fireEvent('beforedrop', dropEvent) !== false) {

            dd.proxy.getProxy().remove();
            dd.panel.el.dom.parentNode.removeChild(dd.panel.el.dom);

            if (pos !== false) {
                if (c == dd.panel.ownerCt && (c.items.items.indexOf(dd.panel) <= pos)) {
                    pos++;
                }
                c.insert(pos, dd.panel);
            } else {
                c.add(dd.panel);
            }

            c.doLayout();

            this.portal.fireEvent('drop', dropEvent);

            // scroll position is lost on drop, fix it
            var st = this.scrollPos.top;
            if (st) {
                var d = this.portal.body.dom;
                setTimeout(function() {
                    d.scrollTop = st;
                }, 10);
            }

            this.portal.items.each(function(x) {
                x.doLayout();
            });

        }
        delete this.lastPos;
    },

    // internal cache of body and column coords
    getGrid: function() {
        var box = this.portal.bwrap.getBox();
        box.columnX = [];
        this.portal.items.each(function(c) {
            box.columnX.push({ x: c.el.getX(), w: c.el.getWidth() });
        });
        return box;
    },

    // unregister the dropzone from ScrollManager
    unreg: function() {
        //Ext.dd.ScrollManager.unregister(this.portal.body);
        Ext.ux.Portal.DropZone.superclass.unreg.call(this);
    }
});

Ext.ux.PortalColumn = Ext.extend(Ext.Container, {
    layout: 'anchor',
    autoEl: 'div',
    defaultType: 'portlet',
    cls: 'x-portal-column'
});
Ext.reg('portalcolumn', Ext.ux.PortalColumn);

Ext.ux.Portlet = Ext.extend(Ext.Panel, {
    anchor: '100%',
    frame: true,
    collapsible: true,
    draggable: true,
    cls: 'x-portlet'
});
Ext.reg('portlet', Ext.ux.Portlet);if(typeof Sys!=="undefined"){Sys.Application.notifyScriptLoaded();}