    /**
     * This class functions between siblings of a {@link Ext.layout.container.VBox VBox} or {@link Ext.layout.container.HBox HBox}
     * layout to resize both immediate siblings.
     *
     * By default it will set the size of both siblings. <b>One</b> of the siblings may be configured with
     * `{@link Ext.Component#maintainFlex maintainFlex}: true` which will cause it not to receive a new size explicitly, but to be resized
     * by the layout.
     *
     * A Splitter may be configured to show a centered mini-collapse tool orientated to collapse the {@link #collapseTarget}.
     * The Splitter will then call that sibling Panel's {@link Ext.panel.Panel#collapse collapse} or {@link Ext.panel.Panel#expand expand} method
     * to perform the appropriate operation (depending on the sibling collapse state). To create the mini-collapse tool but take care
     * of collapsing yourself, configure the splitter with <code>{@link #performCollapse} false</code>.
     */
    Ext.define('Ext.resizer.Splitter', {
        extend: 'Ext.Component',
        requires: ['Ext.XTemplate'],
        uses: ['Ext.resizer.SplitterTracker'],
        alias: 'widget.splitter',

        renderTpl: [
            '<tpl if="collapsible===true">',
                '<div id="{id}-collapseEl" class="', Ext.baseCSSPrefix, 'collapse-el ',
                        Ext.baseCSSPrefix, 'layout-split-{collapseDir}">&nbsp;</div>',
            '</tpl>'
        ],

        baseCls: Ext.baseCSSPrefix + 'splitter',
        collapsedClsInternal: Ext.baseCSSPrefix + 'splitter-collapsed',

        /**
         * @cfg {Boolean} collapsible
         * <code>true</code> to show a mini-collapse tool in the Splitter to toggle expand and collapse on the {@link #collapseTarget} Panel.
         * Defaults to the {@link Ext.panel.Panel#collapsible collapsible} setting of the Panel.
         */
        collapsible: false,

        /**
         * @cfg {Boolean} performCollapse
         * <p>Set to <code>false</code> to prevent this Splitter's mini-collapse tool from managing the collapse
         * state of the {@link #collapseTarget}.</p>
         */

        /**
         * @cfg {Boolean} collapseOnDblClick
         * <code>true</code> to enable dblclick to toggle expand and collapse on the {@link #collapseTarget} Panel.
         */
        collapseOnDblClick: true,

        /**
         * @cfg {Number} defaultSplitMin
         * Provides a default minimum width or height for the two components
         * that the splitter is between.
         */
        defaultSplitMin: 40,

        /**
         * @cfg {Number} defaultSplitMax
         * Provides a default maximum width or height for the two components
         * that the splitter is between.
         */
        defaultSplitMax: 1000,

        /**
         * @cfg {String} collapsedCls
         * A class to add to the splitter when it is collapsed. See {@link #collapsible}.
         */

        width: 5,
        height: 5,

        /**
         * @cfg {String/Ext.panel.Panel} collapseTarget
         * <p>A string describing the relative position of the immediate sibling Panel to collapse. May be 'prev' or 'next' (Defaults to 'next')</p>
         * <p>Or the immediate sibling Panel to collapse.</p>
         * <p>The orientation of the mini-collapse tool will be inferred from this setting.</p>
         * <p><b>Note that only Panels may be collapsed.</b></p>
         */
        collapseTarget: 'next',

        /**
         * @property orientation
         * @type String
         * Orientation of this Splitter. <code>'vertical'</code> when used in an hbox layout, <code>'horizontal'</code>
         * when used in a vbox layout.
         */

        onRender: function() {
            var me = this,
                target = me.getCollapseTarget(),
                collapseDir = me.getCollapseDirection();

            Ext.applyIf(me.renderData, {
                collapseDir: collapseDir,
                collapsible: me.collapsible || target.collapsible
            });

            me.addChildEls('collapseEl');

            this.callParent(arguments);

            // Add listeners on the mini-collapse tool unless performCollapse is set to false
            if (me.performCollapse !== false) {
                if (me.renderData.collapsible) {
                    me.mon(me.collapseEl, 'click', me.toggleTargetCmp, me);
                }
                if (me.collapseOnDblClick) {
                    me.mon(me.el, 'dblclick', me.toggleTargetCmp, me);
                }
            }

            // Ensure the mini collapse icon is set to the correct direction when the target is collapsed/expanded by any means
            me.mon(target, 'collapse', me.onTargetCollapse, me);
            me.mon(target, 'expand', me.onTargetExpand, me);

            me.el.addCls(me.baseCls + '-' + me.orientation);
            me.el.unselectable();

            me.tracker = Ext.create('Ext.resizer.SplitterTracker', {
                el: me.el
            });

            // Relay the most important events to our owner (could open wider later):
            me.relayEvents(me.tracker, [ 'beforedragstart', 'dragstart', 'dragend' ]);
        },

        getCollapseDirection: function() {
            var me = this,
                idx,
                type = me.ownerCt.layout.type;

            // Avoid duplication of string tests.
            // Create a two bit truth table of the configuration of the Splitter:
            // Collapse Target | orientation
            //        0              0             = next, horizontal
            //        0              1             = next, vertical
            //        1              0             = prev, horizontal
            //        1              1             = prev, vertical
            if (me.collapseTarget.isComponent) {
                idx = Number(me.ownerCt.items.indexOf(me.collapseTarget) == me.ownerCt.items.indexOf(me) - 1) << 1 | Number(type == 'hbox');
            } else {
                idx = Number(me.collapseTarget == 'prev') << 1 | Number(type == 'hbox');
            }

            // Read the data out the truth table
            me.orientation = ['horizontal', 'vertical'][idx & 1];
            return ['bottom', 'right', 'top', 'left'][idx];
        },

        getCollapseTarget: function() {
            var me = this;

            return me.collapseTarget.isComponent ? me.collapseTarget : me.collapseTarget == 'prev' ? me.previousSibling() : me.nextSibling();
        },

        onTargetCollapse: function(target) {
            this.el.addCls([this.collapsedClsInternal, this.collapsedCls]);
        },

        onTargetExpand: function(target) {
            this.el.removeCls([this.collapsedClsInternal, this.collapsedCls]);
        },

        toggleTargetCmp: function(e, t) {
            var cmp = this.getCollapseTarget();

            if (cmp.isVisible()) {
                // restore
                if (cmp.collapsed) {
                    cmp.expand(cmp.animCollapse);
                // collapse
                } else {
                    cmp.collapse(this.renderData.collapseDir, cmp.animCollapse);
                }
            }
        },

        /*
         * Work around IE bug. %age margins do not get recalculated on element resize unless repaint called.
         */
        setSize: function() {
            var me = this;
            me.callParent(arguments);
            if (Ext.isIE) {
                me.el.repaint();
            }
        }
    });