The source code

    /**
     * @class Ext.layout.BorderLayout
     * @extends Ext.layout.ContainerLayout
     * <p>This is a multi-pane, application-oriented UI layout style that supports multiple
     * nested panels, automatic {@link Ext.layout.BorderLayout.Region#split split} bars between
     * {@link Ext.layout.BorderLayout.Region#BorderLayout.Region regions} and built-in
     * {@link Ext.layout.BorderLayout.Region#collapsible expanding and collapsing} of regions.</p>
     * <p>This class is intended to be extended or created via the <tt>layout:'border'</tt>
     * {@link Ext.Container#layout} config, and should generally not need to be created directly
     * via the new keyword.</p>
     * <p>BorderLayout does not have any direct config options (other than inherited ones).
     * All configuration options available for customizing the BorderLayout are at the
     * {@link Ext.layout.BorderLayout.Region} and {@link Ext.layout.BorderLayout.SplitRegion}
     * levels.</p>
     * <p>Example usage:</p>
     * <pre><code>
    var myBorderPanel = new Ext.Panel({
        {@link Ext.Component#renderTo renderTo}: document.body,
        {@link Ext.BoxComponent#width width}: 700,
        {@link Ext.BoxComponent#height height}: 500,
        {@link Ext.Panel#title title}: 'Border Layout',
        {@link Ext.Container#layout layout}: 'border',
        {@link Ext.Container#items items}: [{
            {@link Ext.Panel#title title}: 'South Region is resizable',
            {@link Ext.layout.BorderLayout.Region#BorderLayout.Region region}: 'south',     // position for region
            {@link Ext.BoxComponent#height height}: 100,
            {@link Ext.layout.BorderLayout.Region#split split}: true,         // enable resizing
            {@link Ext.SplitBar#minSize minSize}: 75,         // defaults to {@link Ext.layout.BorderLayout.Region#minHeight 50}
            {@link Ext.SplitBar#maxSize maxSize}: 150,
            {@link Ext.layout.BorderLayout.Region#margins margins}: '0 5 5 5'
        },{
            // xtype: 'panel' implied by default
            {@link Ext.Panel#title title}: 'West Region is collapsible',
            {@link Ext.layout.BorderLayout.Region#BorderLayout.Region region}:'west',
            {@link Ext.layout.BorderLayout.Region#margins margins}: '5 0 0 5',
            {@link Ext.BoxComponent#width width}: 200,
            {@link Ext.layout.BorderLayout.Region#collapsible collapsible}: true,   // make collapsible
            {@link Ext.layout.BorderLayout.Region#cmargins cmargins}: '5 5 0 5', // adjust top margin when collapsed
            {@link Ext.Component#id id}: 'west-region-container',
            {@link Ext.Container#layout layout}: 'fit',
            {@link Ext.Panel#unstyled unstyled}: true
        },{
            {@link Ext.Panel#title title}: 'Center Region',
            {@link Ext.layout.BorderLayout.Region#BorderLayout.Region region}: 'center',     // center region is required, no width/height specified
            {@link Ext.Component#xtype xtype}: 'container',
            {@link Ext.Container#layout layout}: 'fit',
            {@link Ext.layout.BorderLayout.Region#margins margins}: '5 5 0 0'
        }]
    });
    </code></pre>
     * <p><b><u>Notes</u></b>:</p><div class="mdetail-params"><ul>
     * <li>Any container using the BorderLayout <b>must</b> have a child item with <tt>region:'center'</tt>.
     * The child item in the center region will always be resized to fill the remaining space not used by
     * the other regions in the layout.</li>
     * <li>Any child items with a region of <tt>west</tt> or <tt>east</tt> must have <tt>width</tt> defined
     * (an integer representing the number of pixels that the region should take up).</li>
     * <li>Any child items with a region of <tt>north</tt> or <tt>south</tt> must have <tt>height</tt> defined.</li>
     * <li>The regions of a BorderLayout are <b>fixed at render time</b> and thereafter, its child Components may not be removed or added</b>.  To add/remove
     * Components within a BorderLayout, have them wrapped by an additional Container which is directly
     * managed by the BorderLayout.  If the region is to be collapsible, the Container used directly
     * by the BorderLayout manager should be a Panel.  In the following example a Container (an Ext.Panel)
     * is added to the west region:
     * <div style="margin-left:16px"><pre><code>
    wrc = {@link Ext#getCmp Ext.getCmp}('west-region-container');
    wrc.{@link Ext.Panel#removeAll removeAll}();
    wrc.{@link Ext.Container#add add}({
        title: 'Added Panel',
        html: 'Some content'
    });
    wrc.{@link Ext.Container#doLayout doLayout}();
     * </code></pre></div>
     * </li>
     * <li> To reference a {@link Ext.layout.BorderLayout.Region Region}:
     * <div style="margin-left:16px"><pre><code>
    wr = myBorderPanel.layout.west;
     * </code></pre></div>
     * </li>
     * </ul></div>
     */
    Ext.layout.BorderLayout = Ext.extend(Ext.layout.ContainerLayout, {
        // private
        monitorResize:true,
        // private
        rendered : false,

        type: 'border',

        targetCls: 'x-border-layout-ct',

        getLayoutTargetSize : function() {
            var target = this.container.getLayoutTarget();
            return target ? target.getViewSize() : {};
        },

        // private
        onLayout : function(ct, target){
            var collapsed, i, c, pos, items = ct.items.items, len = items.length;
            if(!this.rendered){
                collapsed = [];
                for(i = 0; i < len; i++) {
                    c = items[i];
                    pos = c.region;
                    if(c.collapsed){
                        collapsed.push(c);
                    }
                    c.collapsed = false;
                    if(!c.rendered){
                        c.render(target, i);
                        c.getPositionEl().addClass('x-border-panel');
                    }
                    this[pos] = pos != 'center' && c.split ?
                        new Ext.layout.BorderLayout.SplitRegion(this, c.initialConfig, pos) :
                        new Ext.layout.BorderLayout.Region(this, c.initialConfig, pos);
                    this[pos].render(target, c);
                }
                this.rendered = true;
            }

            var size = this.getLayoutTargetSize();
            if(size.width < 20 || size.height < 20){ // display none?
                if(collapsed){
                    this.restoreCollapsed = collapsed;
                }
                return;
            }else if(this.restoreCollapsed){
                collapsed = this.restoreCollapsed;
                delete this.restoreCollapsed;
            }

            var w = size.width, h = size.height,
                centerW = w, centerH = h, centerY = 0, centerX = 0,
                n = this.north, s = this.south, west = this.west, e = this.east, c = this.center,
                b, m, totalWidth, totalHeight;
            if(!c && Ext.layout.BorderLayout.WARN !== false){
                throw 'No center region defined in BorderLayout ' + ct.id;
            }

            if(n && n.isVisible()){
                b = n.getSize();
                m = n.getMargins();
                b.width = w - (m.left+m.right);
                b.x = m.left;
                b.y = m.top;
                centerY = b.height + b.y + m.bottom;
                centerH -= centerY;
                n.applyLayout(b);
            }
            if(s && s.isVisible()){
                b = s.getSize();
                m = s.getMargins();
                b.width = w - (m.left+m.right);
                b.x = m.left;
                totalHeight = (b.height + m.top + m.bottom);
                b.y = h - totalHeight + m.top;
                centerH -= totalHeight;
                s.applyLayout(b);
            }
            if(west && west.isVisible()){
                b = west.getSize();
                m = west.getMargins();
                b.height = centerH - (m.top+m.bottom);
                b.x = m.left;
                b.y = centerY + m.top;
                totalWidth = (b.width + m.left + m.right);
                centerX += totalWidth;
                centerW -= totalWidth;
                west.applyLayout(b);
            }
            if(e && e.isVisible()){
                b = e.getSize();
                m = e.getMargins();
                b.height = centerH - (m.top+m.bottom);
                totalWidth = (b.width + m.left + m.right);
                b.x = w - totalWidth + m.left;
                b.y = centerY + m.top;
                centerW -= totalWidth;
                e.applyLayout(b);
            }
            if(c){
                m = c.getMargins();
                var centerBox = {
                    x: centerX + m.left,
                    y: centerY + m.top,
                    width: centerW - (m.left+m.right),
                    height: centerH - (m.top+m.bottom)
                };
                c.applyLayout(centerBox);
            }
            if(collapsed){
                for(i = 0, len = collapsed.length; i < len; i++){
                    collapsed[i].collapse(false);
                }
            }
            if(Ext.isIE9m && Ext.isStrict){ // workaround IE strict repainting issue
                target.repaint();
            }
            // Putting a border layout into an overflowed container is NOT correct and will make a second layout pass necessary.
            if (i = target.getStyle('overflow') && i != 'hidden' && !this.adjustmentPass) {
                var ts = this.getLayoutTargetSize();
                if (ts.width != size.width || ts.height != size.height){
                    this.adjustmentPass = true;
                    this.onLayout(ct, target);
                }
            }
            delete this.adjustmentPass;
        },

        destroy: function() {
            var r = ['north', 'south', 'east', 'west'], i, region;
            for (i = 0; i < r.length; i++) {
                region = this[r[i]];
                if(region){
                    if(region.destroy){
                        region.destroy();
                    }else if (region.split){
                        region.split.destroy(true);
                    }
                }
            }
            Ext.layout.BorderLayout.superclass.destroy.call(this);
        }

        /**
         * @property activeItem
         * @hide
         */
    });

    /**
     * @class Ext.layout.BorderLayout.Region
     * <p>This is a region of a {@link Ext.layout.BorderLayout BorderLayout} that acts as a subcontainer
     * within the layout. Each region in the layout is a component, the region itself is constructed on top
     * of that component, acting like a mixin. Each region has its own {@link Ext.layout.ContainerLayout layout}
     * that is independent of other regions and the containing BorderLayout, and can be any of the
     * {@link Ext.layout.ContainerLayout valid Ext layout types}.</p>
     * <p>Region size is managed automatically and cannot be changed by the user -- for
     * {@link #split resizable regions}, see {@link Ext.layout.BorderLayout.SplitRegion}.</p>
     * @constructor
     * Create a new Region.
     * @param {Layout} layout The {@link Ext.layout.BorderLayout BorderLayout} instance that is managing this Region.
     * @param {Object} config The configuration options
     * @param {String} position The region position.  Valid values are: <tt>north</tt>, <tt>south</tt>,
     * <tt>east</tt>, <tt>west</tt> and <tt>center</tt>.  Every {@link Ext.layout.BorderLayout BorderLayout}
     * <b>must have a center region</b> for the primary content -- all other regions are optional.
     */
    Ext.layout.BorderLayout.Region = function(layout, config, pos){
        Ext.apply(this, config);
        this.layout = layout;
        this.position = pos;
        this.state = {};
        if(typeof this.margins == 'string'){
            this.margins = this.layout.parseMargins(this.margins);
        }
        this.margins = Ext.applyIf(this.margins || {}, this.defaultMargins);
        if(this.collapsible){
            if(typeof this.cmargins == 'string'){
                this.cmargins = this.layout.parseMargins(this.cmargins);
            }
            if(this.collapseMode == 'mini' && !this.cmargins){
                this.cmargins = {left:0,top:0,right:0,bottom:0};
            }else{
                this.cmargins = Ext.applyIf(this.cmargins || {},
                    pos == 'north' || pos == 'south' ? this.defaultNSCMargins : this.defaultEWCMargins);
            }
        }
    };

    Ext.layout.BorderLayout.Region.prototype = {
        /**
         * @cfg {Boolean} animFloat
         * When a collapsed region's bar is clicked, the region's panel will be displayed as a floated
         * panel that will close again once the user mouses out of that panel (or clicks out if
         * <tt>{@link #autoHide} = false</tt>).  Setting <tt>{@link #animFloat} = false</tt> will
         * prevent the open and close of these floated panels from being animated (defaults to <tt>true</tt>).
         */
        /**
         * @cfg {Boolean} autoHide
         * When a collapsed region's bar is clicked, the region's panel will be displayed as a floated
         * panel.  If <tt>autoHide = true</tt>, the panel will automatically hide after the user mouses
         * out of the panel.  If <tt>autoHide = false</tt>, the panel will continue to display until the
         * user clicks outside of the panel (defaults to <tt>true</tt>).
         */
        /**
         * @cfg {String} collapseMode
         * <tt>collapseMode</tt> supports two configuration values:<div class="mdetail-params"><ul>
         * <li><b><tt>undefined</tt></b> (default)<div class="sub-desc">By default, {@link #collapsible}
         * regions are collapsed by clicking the expand/collapse tool button that renders into the region's
         * title bar.</div></li>
         * <li><b><tt>'mini'</tt></b><div class="sub-desc">Optionally, when <tt>collapseMode</tt> is set to
         * <tt>'mini'</tt> the region's split bar will also display a small collapse button in the center of
         * the bar. In <tt>'mini'</tt> mode the region will collapse to a thinner bar than in normal mode.
         * </div></li>
         * </ul></div></p>
         * <p><b>Note</b>: if a collapsible region does not have a title bar, then set <tt>collapseMode =
         * 'mini'</tt> and <tt>{@link #split} = true</tt> in order for the region to be {@link #collapsible}
         * by the user as the expand/collapse tool button (that would go in the title bar) will not be rendered.</p>
         * <p>See also <tt>{@link #cmargins}</tt>.</p>
         */
        /**
         * @cfg {Object} margins
         * An object containing margins to apply to the region when in the expanded state in the
         * format:<pre><code>
    {
        top: (top margin),
        right: (right margin),
        bottom: (bottom margin),
        left: (left margin)
    }</code></pre>
         * <p>May also be a string containing space-separated, numeric margin values. The order of the
         * sides associated with each value matches the way CSS processes margin values:</p>
         * <p><div class="mdetail-params"><ul>
         * <li>If there is only one value, it applies to all sides.</li>
         * <li>If there are two values, the top and bottom borders are set to the first value and the
         * right and left are set to the second.</li>
         * <li>If there are three values, the top is set to the first value, the left and right are set
         * to the second, and the bottom is set to the third.</li>
         * <li>If there are four values, they apply to the top, right, bottom, and left, respectively.</li>
         * </ul></div></p>
         * <p>Defaults to:</p><pre><code>
         * {top:0, right:0, bottom:0, left:0}
         * </code></pre>
         */
        /**
         * @cfg {Object} cmargins
         * An object containing margins to apply to the region when in the collapsed state in the
         * format:<pre><code>
    {
        top: (top margin),
        right: (right margin),
        bottom: (bottom margin),
        left: (left margin)
    }</code></pre>
         * <p>May also be a string containing space-separated, numeric margin values. The order of the
         * sides associated with each value matches the way CSS processes margin values.</p>
         * <p><ul>
         * <li>If there is only one value, it applies to all sides.</li>
         * <li>If there are two values, the top and bottom borders are set to the first value and the
         * right and left are set to the second.</li>
         * <li>If there are three values, the top is set to the first value, the left and right are set
         * to the second, and the bottom is set to the third.</li>
         * <li>If there are four values, they apply to the top, right, bottom, and left, respectively.</li>
         * </ul></p>
         */
        /**
         * @cfg {Boolean} collapsible
         * <p><tt>true</tt> to allow the user to collapse this region (defaults to <tt>false</tt>).  If
         * <tt>true</tt>, an expand/collapse tool button will automatically be rendered into the title
         * bar of the region, otherwise the button will not be shown.</p>
         * <p><b>Note</b>: that a title bar is required to display the collapse/expand toggle button -- if
         * no <tt>title</tt> is specified for the region's panel, the region will only be collapsible if
         * <tt>{@link #collapseMode} = 'mini'</tt> and <tt>{@link #split} = true</tt>.
         */
        collapsible : false,
        /**
         * @cfg {Boolean} split
         * <p><tt>true</tt> to create a {@link Ext.layout.BorderLayout.SplitRegion SplitRegion} and
         * display a 5px wide {@link Ext.SplitBar} between this region and its neighbor, allowing the user to
         * resize the regions dynamically.  Defaults to <tt>false</tt> creating a
         * {@link Ext.layout.BorderLayout.Region Region}.</p><br>
         * <p><b>Notes</b>:</p><div class="mdetail-params"><ul>
         * <li>this configuration option is ignored if <tt>region='center'</tt></li>
         * <li>when <tt>split == true</tt>, it is common to specify a
         * <tt>{@link Ext.SplitBar#minSize minSize}</tt> and <tt>{@link Ext.SplitBar#maxSize maxSize}</tt>
         * for the {@link Ext.BoxComponent BoxComponent} representing the region. These are not native
         * configs of {@link Ext.BoxComponent BoxComponent}, and are used only by this class.</li>
         * <li>if <tt>{@link #collapseMode} = 'mini'</tt> requires <tt>split = true</tt> to reserve space
         * for the collapse tool</tt></li>
         * </ul></div>
         */
        split:false,
        /**
         * @cfg {Boolean} floatable
         * <tt>true</tt> to allow clicking a collapsed region's bar to display the region's panel floated
         * above the layout, <tt>false</tt> to force the user to fully expand a collapsed region by
         * clicking the expand button to see it again (defaults to <tt>true</tt>).
         */
        floatable: true,
        /**
         * @cfg {Number} minWidth
         * <p>The minimum allowable width in pixels for this region (defaults to <tt>50</tt>).
         * <tt>maxWidth</tt> may also be specified.</p><br>
         * <p><b>Note</b>: setting the <tt>{@link Ext.SplitBar#minSize minSize}</tt> /
         * <tt>{@link Ext.SplitBar#maxSize maxSize}</tt> supersedes any specified
         * <tt>minWidth</tt> / <tt>maxWidth</tt>.</p>
         */
        minWidth:50,
        /**
         * @cfg {Number} minHeight
         * The minimum allowable height in pixels for this region (defaults to <tt>50</tt>)
         * <tt>maxHeight</tt> may also be specified.</p><br>
         * <p><b>Note</b>: setting the <tt>{@link Ext.SplitBar#minSize minSize}</tt> /
         * <tt>{@link Ext.SplitBar#maxSize maxSize}</tt> supersedes any specified
         * <tt>minHeight</tt> / <tt>maxHeight</tt>.</p>
         */
        minHeight:50,

        // private
        defaultMargins : {left:0,top:0,right:0,bottom:0},
        // private
        defaultNSCMargins : {left:5,top:5,right:5,bottom:5},
        // private
        defaultEWCMargins : {left:5,top:0,right:5,bottom:0},
        floatingZIndex: 100,

        /**
         * True if this region is collapsed. Read-only.
         * @type Boolean
         * @property
         */
        isCollapsed : false,

        /**
         * This region's panel.  Read-only.
         * @type Ext.Panel
         * @property panel
         */
        /**
         * This region's layout.  Read-only.
         * @type Layout
         * @property layout
         */
        /**
         * This region's layout position (north, south, east, west or center).  Read-only.
         * @type String
         * @property position
         */

        // private
        render : function(ct, p){
            this.panel = p;
            p.el.enableDisplayMode();
            this.targetEl = ct;
            this.el = p.el;

            var gs = p.getState, ps = this.position;
            p.getState = function(){
                return Ext.apply(gs.call(p) || {}, this.state);
            }.createDelegate(this);

            if(ps != 'center'){
                p.allowQueuedExpand = false;
                p.on({
                    beforecollapse: this.beforeCollapse,
                    collapse: this.onCollapse,
                    beforeexpand: this.beforeExpand,
                    expand: this.onExpand,
                    hide: this.onHide,
                    show: this.onShow,
                    scope: this
                });
                if(this.collapsible || this.floatable){
                    p.collapseEl = 'el';
                    p.slideAnchor = this.getSlideAnchor();
                }
                if(p.tools && p.tools.toggle){
                    p.tools.toggle.addClass('x-tool-collapse-'+ps);
                    p.tools.toggle.addClassOnOver('x-tool-collapse-'+ps+'-over');
                }
            }
        },

        // private
        getCollapsedEl : function(){
            if(!this.collapsedEl){
                if(!this.toolTemplate){
                    var tt = new Ext.Template(
                         '<div class="x-tool x-tool-{id}">&#160;</div>'
                    );
                    tt.disableFormats = true;
                    tt.compile();
                    Ext.layout.BorderLayout.Region.prototype.toolTemplate = tt;
                }
                this.collapsedEl = this.targetEl.createChild({
                    cls: "x-layout-collapsed x-layout-collapsed-"+this.position,
                    id: this.panel.id + '-xcollapsed'
                });
                this.collapsedEl.enableDisplayMode('block');

                if(this.collapseMode == 'mini'){
                    this.collapsedEl.addClass('x-layout-cmini-'+this.position);
                    this.miniCollapsedEl = this.collapsedEl.createChild({
                        cls: "x-layout-mini x-layout-mini-"+this.position, html: "&#160;"
                    });
                    this.miniCollapsedEl.addClassOnOver('x-layout-mini-over');
                    this.collapsedEl.addClassOnOver("x-layout-collapsed-over");
                    this.collapsedEl.on('click', this.onExpandClick, this, {stopEvent:true});
                }else {
                    if(this.collapsible !== false && !this.hideCollapseTool) {
                        var t = this.expandToolEl = this.toolTemplate.append(
                                this.collapsedEl.dom,
                                {id:'expand-'+this.position}, true);
                        t.addClassOnOver('x-tool-expand-'+this.position+'-over');
                        t.on('click', this.onExpandClick, this, {stopEvent:true});
                    }
                    if(this.floatable !== false || this.titleCollapse){
                       this.collapsedEl.addClassOnOver("x-layout-collapsed-over");
                       this.collapsedEl.on("click", this[this.floatable ? 'collapseClick' : 'onExpandClick'], this);
                    }
                }
            }
            return this.collapsedEl;
        },

        // private
        onExpandClick : function(e){
            if(this.isSlid){
                this.panel.expand(false);
            }else{
                this.panel.expand();
            }
        },

        // private
        onCollapseClick : function(e){
            this.panel.collapse();
        },

        // private
        beforeCollapse : function(p, animate){
            this.lastAnim = animate;
            if(this.splitEl){
                this.splitEl.hide();
            }
            this.getCollapsedEl().show();
            var el = this.panel.getEl();
            this.originalZIndex = el.getStyle('z-index');
            el.setStyle('z-index', 100);
            this.isCollapsed = true;
            this.layout.layout();
        },

        // private
        onCollapse : function(animate){
            this.panel.el.setStyle('z-index', 1);
            if(this.lastAnim === false || this.panel.animCollapse === false){
                this.getCollapsedEl().dom.style.visibility = 'visible';
            }else{
                this.getCollapsedEl().slideIn(this.panel.slideAnchor, {duration:.2});
            }
            this.state.collapsed = true;
            this.panel.saveState();
        },

        // private
        beforeExpand : function(animate){
            if(this.isSlid){
                this.afterSlideIn();
            }
            var c = this.getCollapsedEl();
            this.el.show();
            if(this.position == 'east' || this.position == 'west'){
                this.panel.setSize(undefined, c.getHeight());
            }else{
                this.panel.setSize(c.getWidth(), undefined);
            }
            c.hide();
            c.dom.style.visibility = 'hidden';
            this.panel.el.setStyle('z-index', this.floatingZIndex);
        },

        // private
        onExpand : function(){
            this.isCollapsed = false;
            if(this.splitEl){
                this.splitEl.show();
            }
            this.layout.layout();
            this.panel.el.setStyle('z-index', this.originalZIndex);
            this.state.collapsed = false;
            this.panel.saveState();
        },

        // private
        collapseClick : function(e){
            if(this.isSlid){
               e.stopPropagation();
               this.slideIn();
            }else{
               e.stopPropagation();
               this.slideOut();
            }
        },

        // private
        onHide : function(){
            if(this.isCollapsed){
                this.getCollapsedEl().hide();
            }else if(this.splitEl){
                this.splitEl.hide();
            }
        },

        // private
        onShow : function(){
            if(this.isCollapsed){
                this.getCollapsedEl().show();
            }else if(this.splitEl){
                this.splitEl.show();
            }
        },

        /**
         * True if this region is currently visible, else false.
         * @return {Boolean}
         */
        isVisible : function(){
            return !this.panel.hidden;
        },

        /**
         * Returns the current margins for this region.  If the region is collapsed, the
         * {@link #cmargins} (collapsed margins) value will be returned, otherwise the
         * {@link #margins} value will be returned.
         * @return {Object} An object containing the element's margins: <tt>{left: (left
         * margin), top: (top margin), right: (right margin), bottom: (bottom margin)}</tt>
         */
        getMargins : function(){
            return this.isCollapsed && this.cmargins ? this.cmargins : this.margins;
        },

        /**
         * Returns the current size of this region.  If the region is collapsed, the size of the
         * collapsedEl will be returned, otherwise the size of the region's panel will be returned.
         * @return {Object} An object containing the element's size: <tt>{width: (element width),
         * height: (element height)}</tt>
         */
        getSize : function(){
            return this.isCollapsed ? this.getCollapsedEl().getSize() : this.panel.getSize();
        },

        /**
         * Sets the specified panel as the container element for this region.
         * @param {Ext.Panel} panel The new panel
         */
        setPanel : function(panel){
            this.panel = panel;
        },

        /**
         * Returns the minimum allowable width for this region.
         * @return {Number} The minimum width
         */
        getMinWidth: function(){
            return this.minWidth;
        },

        /**
         * Returns the minimum allowable height for this region.
         * @return {Number} The minimum height
         */
        getMinHeight: function(){
            return this.minHeight;
        },

        // private
        applyLayoutCollapsed : function(box){
            var ce = this.getCollapsedEl();
            ce.setLeftTop(box.x, box.y);
            ce.setSize(box.width, box.height);
        },

        // private
        applyLayout : function(box){
            if(this.isCollapsed){
                this.applyLayoutCollapsed(box);
            }else{
                this.panel.setPosition(box.x, box.y);
                this.panel.setSize(box.width, box.height);
            }
        },

        // private
        beforeSlide: function(){
            this.panel.beforeEffect();
        },

        // private
        afterSlide : function(){
            this.panel.afterEffect();
        },

        // private
        initAutoHide : function(){
            if(this.autoHide !== false){
                if(!this.autoHideHd){
                    this.autoHideSlideTask = new Ext.util.DelayedTask(this.slideIn, this);
                    this.autoHideHd = {
                        "mouseout": function(e){
                            if(!e.within(this.el, true)){
                                this.autoHideSlideTask.delay(500);
                            }
                        },
                        "mouseover" : function(e){
                            this.autoHideSlideTask.cancel();
                        },
                        scope : this
                    };
                }
                this.el.on(this.autoHideHd);
                this.collapsedEl.on(this.autoHideHd);
            }
        },

        // private
        clearAutoHide : function(){
            if(this.autoHide !== false){
                this.el.un("mouseout", this.autoHideHd.mouseout);
                this.el.un("mouseover", this.autoHideHd.mouseover);
                this.collapsedEl.un("mouseout", this.autoHideHd.mouseout);
                this.collapsedEl.un("mouseover", this.autoHideHd.mouseover);
            }
        },

        // private
        clearMonitor : function(){
            Ext.getDoc().un("click", this.slideInIf, this);
        },

        /**
         * If this Region is {@link #floatable}, this method slides this Region into full visibility <i>over the top
         * of the center Region</i> where it floats until either {@link #slideIn} is called, or other regions of the layout
         * are clicked, or the mouse exits the Region.
         */
        slideOut : function(){
            if(this.isSlid || this.el.hasActiveFx()){
                return;
            }
            this.isSlid = true;
            var ts = this.panel.tools, dh, pc;
            if(ts && ts.toggle){
                ts.toggle.hide();
            }
            this.el.show();

            // Temporarily clear the collapsed flag so we can onResize the panel on the slide
            pc = this.panel.collapsed;
            this.panel.collapsed = false;

            if(this.position == 'east' || this.position == 'west'){
                // Temporarily clear the deferHeight flag so we can size the height on the slide
                dh = this.panel.deferHeight;
                this.panel.deferHeight = false;

                this.panel.setSize(undefined, this.collapsedEl.getHeight());

                // Put the deferHeight flag back after setSize
                this.panel.deferHeight = dh;
            }else{
                this.panel.setSize(this.collapsedEl.getWidth(), undefined);
            }

            // Put the collapsed flag back after onResize
            this.panel.collapsed = pc;

            this.restoreLT = [this.el.dom.style.left, this.el.dom.style.top];
            this.el.alignTo(this.collapsedEl, this.getCollapseAnchor());
            this.el.setStyle("z-index", this.floatingZIndex+2);
            this.panel.el.replaceClass('x-panel-collapsed', 'x-panel-floating');
            if(this.animFloat !== false){
                this.beforeSlide();
                this.el.slideIn(this.getSlideAnchor(), {
                    callback: function(){
                        this.afterSlide();
                        this.initAutoHide();
                        Ext.getDoc().on("click", this.slideInIf, this);
                    },
                    scope: this,
                    block: true
                });
            }else{
                this.initAutoHide();
                 Ext.getDoc().on("click", this.slideInIf, this);
            }
        },

        // private
        afterSlideIn : function(){
            this.clearAutoHide();
            this.isSlid = false;
            this.clearMonitor();
            this.el.setStyle("z-index", "");
            this.panel.el.replaceClass('x-panel-floating', 'x-panel-collapsed');
            this.el.dom.style.left = this.restoreLT[0];
            this.el.dom.style.top = this.restoreLT[1];

            var ts = this.panel.tools;
            if(ts && ts.toggle){
                ts.toggle.show();
            }
        },

        /**
         * If this Region is {@link #floatable}, and this Region has been slid into floating visibility, then this method slides
         * this region back into its collapsed state.
         */
        slideIn : function(cb){
            if(!this.isSlid || this.el.hasActiveFx()){
                Ext.callback(cb);
                return;
            }
            this.isSlid = false;
            if(this.animFloat !== false){
                this.beforeSlide();
                this.el.slideOut(this.getSlideAnchor(), {
                    callback: function(){
                        this.el.hide();
                        this.afterSlide();
                        this.afterSlideIn();
                        Ext.callback(cb);
                    },
                    scope: this,
                    block: true
                });
            }else{
                this.el.hide();
                this.afterSlideIn();
            }
        },

        // private
        slideInIf : function(e){
            if(!e.within(this.el)){
                this.slideIn();
            }
        },

        // private
        anchors : {
            "west" : "left",
            "east" : "right",
            "north" : "top",
            "south" : "bottom"
        },

        // private
        sanchors : {
            "west" : "l",
            "east" : "r",
            "north" : "t",
            "south" : "b"
        },

        // private
        canchors : {
            "west" : "tl-tr",
            "east" : "tr-tl",
            "north" : "tl-bl",
            "south" : "bl-tl"
        },

        // private
        getAnchor : function(){
            return this.anchors[this.position];
        },

        // private
        getCollapseAnchor : function(){
            return this.canchors[this.position];
        },

        // private
        getSlideAnchor : function(){
            return this.sanchors[this.position];
        },

        // private
        getAlignAdj : function(){
            var cm = this.cmargins;
            switch(this.position){
                case "west":
                    return [0, 0];
                break;
                case "east":
                    return [0, 0];
                break;
                case "north":
                    return [0, 0];
                break;
                case "south":
                    return [0, 0];
                break;
            }
        },

        // private
        getExpandAdj : function(){
            var c = this.collapsedEl, cm = this.cmargins;
            switch(this.position){
                case "west":
                    return [-(cm.right+c.getWidth()+cm.left), 0];
                break;
                case "east":
                    return [cm.right+c.getWidth()+cm.left, 0];
                break;
                case "north":
                    return [0, -(cm.top+cm.bottom+c.getHeight())];
                break;
                case "south":
                    return [0, cm.top+cm.bottom+c.getHeight()];
                break;
            }
        },

        destroy : function(){
            if (this.autoHideSlideTask && this.autoHideSlideTask.cancel){
                this.autoHideSlideTask.cancel();
            }
            Ext.destroyMembers(this, 'miniCollapsedEl', 'collapsedEl', 'expandToolEl');
        }
    };

    /**
     * @class Ext.layout.BorderLayout.SplitRegion
     * @extends Ext.layout.BorderLayout.Region
     * <p>This is a specialized type of {@link Ext.layout.BorderLayout.Region BorderLayout region} that
     * has a built-in {@link Ext.SplitBar} for user resizing of regions.  The movement of the split bar
     * is configurable to move either {@link #tickSize smooth or incrementally}.</p>
     * @constructor
     * Create a new SplitRegion.
     * @param {Layout} layout The {@link Ext.layout.BorderLayout BorderLayout} instance that is managing this Region.
     * @param {Object} config The configuration options
     * @param {String} position The region position.  Valid values are: north, south, east, west and center.  Every
     * BorderLayout must have a center region for the primary content -- all other regions are optional.
     */
    Ext.layout.BorderLayout.SplitRegion = function(layout, config, pos){
        Ext.layout.BorderLayout.SplitRegion.superclass.constructor.call(this, layout, config, pos);
        // prevent switch
        this.applyLayout = this.applyFns[pos];
    };

    Ext.extend(Ext.layout.BorderLayout.SplitRegion, Ext.layout.BorderLayout.Region, {
        /**
         * @cfg {Number} tickSize
         * The increment, in pixels by which to move this Region's {@link Ext.SplitBar SplitBar}.
         * By default, the {@link Ext.SplitBar SplitBar} moves smoothly.
         */
        /**
         * @cfg {String} splitTip
         * The tooltip to display when the user hovers over a
         * {@link Ext.layout.BorderLayout.Region#collapsible non-collapsible} region's split bar
         * (defaults to <tt>"Drag to resize."</tt>).  Only applies if
         * <tt>{@link #useSplitTips} = true</tt>.
         */
        splitTip : "Drag to resize.",
        /**
         * @cfg {String} collapsibleSplitTip
         * The tooltip to display when the user hovers over a
         * {@link Ext.layout.BorderLayout.Region#collapsible collapsible} region's split bar
         * (defaults to "Drag to resize. Double click to hide."). Only applies if
         * <tt>{@link #useSplitTips} = true</tt>.
         */
        collapsibleSplitTip : "Drag to resize. Double click to hide.",
        /**
         * @cfg {Boolean} useSplitTips
         * <tt>true</tt> to display a tooltip when the user hovers over a region's split bar
         * (defaults to <tt>false</tt>).  The tooltip text will be the value of either
         * <tt>{@link #splitTip}</tt> or <tt>{@link #collapsibleSplitTip}</tt> as appropriate.
         */
        useSplitTips : false,

        // private
        splitSettings : {
            north : {
                orientation: Ext.SplitBar.VERTICAL,
                placement: Ext.SplitBar.TOP,
                maxFn : 'getVMaxSize',
                minProp: 'minHeight',
                maxProp: 'maxHeight'
            },
            south : {
                orientation: Ext.SplitBar.VERTICAL,
                placement: Ext.SplitBar.BOTTOM,
                maxFn : 'getVMaxSize',
                minProp: 'minHeight',
                maxProp: 'maxHeight'
            },
            east : {
                orientation: Ext.SplitBar.HORIZONTAL,
                placement: Ext.SplitBar.RIGHT,
                maxFn : 'getHMaxSize',
                minProp: 'minWidth',
                maxProp: 'maxWidth'
            },
            west : {
                orientation: Ext.SplitBar.HORIZONTAL,
                placement: Ext.SplitBar.LEFT,
                maxFn : 'getHMaxSize',
                minProp: 'minWidth',
                maxProp: 'maxWidth'
            }
        },

        // private
        applyFns : {
            west : function(box){
                if(this.isCollapsed){
                    return this.applyLayoutCollapsed(box);
                }
                var sd = this.splitEl.dom, s = sd.style;
                this.panel.setPosition(box.x, box.y);
                var sw = sd.offsetWidth;
                s.left = (box.x+box.width-sw)+'px';
                s.top = (box.y)+'px';
                s.height = Math.max(0, box.height)+'px';
                this.panel.setSize(box.width-sw, box.height);
            },
            east : function(box){
                if(this.isCollapsed){
                    return this.applyLayoutCollapsed(box);
                }
                var sd = this.splitEl.dom, s = sd.style;
                var sw = sd.offsetWidth;
                this.panel.setPosition(box.x+sw, box.y);
                s.left = (box.x)+'px';
                s.top = (box.y)+'px';
                s.height = Math.max(0, box.height)+'px';
                this.panel.setSize(box.width-sw, box.height);
            },
            north : function(box){
                if(this.isCollapsed){
                    return this.applyLayoutCollapsed(box);
                }
                var sd = this.splitEl.dom, s = sd.style;
                var sh = sd.offsetHeight;
                this.panel.setPosition(box.x, box.y);
                s.left = (box.x)+'px';
                s.top = (box.y+box.height-sh)+'px';
                s.width = Math.max(0, box.width)+'px';
                this.panel.setSize(box.width, box.height-sh);
            },
            south : function(box){
                if(this.isCollapsed){
                    return this.applyLayoutCollapsed(box);
                }
                var sd = this.splitEl.dom, s = sd.style;
                var sh = sd.offsetHeight;
                this.panel.setPosition(box.x, box.y+sh);
                s.left = (box.x)+'px';
                s.top = (box.y)+'px';
                s.width = Math.max(0, box.width)+'px';
                this.panel.setSize(box.width, box.height-sh);
            }
        },

        // private
        render : function(ct, p){
            Ext.layout.BorderLayout.SplitRegion.superclass.render.call(this, ct, p);

            var ps = this.position;

            this.splitEl = ct.createChild({
                cls: "x-layout-split x-layout-split-"+ps, html: "&#160;",
                id: this.panel.id + '-xsplit'
            });

            if(this.collapseMode == 'mini'){
                this.miniSplitEl = this.splitEl.createChild({
                    cls: "x-layout-mini x-layout-mini-"+ps, html: "&#160;"
                });
                this.miniSplitEl.addClassOnOver('x-layout-mini-over');
                this.miniSplitEl.on('click', this.onCollapseClick, this, {stopEvent:true});
            }

            var s = this.splitSettings[ps];

            this.split = new Ext.SplitBar(this.splitEl.dom, p.el, s.orientation);
            this.split.tickSize = this.tickSize;
            this.split.placement = s.placement;
            this.split.getMaximumSize = this[s.maxFn].createDelegate(this);
            this.split.minSize = this.minSize || this[s.minProp];
            this.split.on("beforeapply", this.onSplitMove, this);
            this.split.useShim = this.useShim === true;
            this.maxSize = this.maxSize || this[s.maxProp];

            if(p.hidden){
                this.splitEl.hide();
            }

            if(this.useSplitTips){
                this.splitEl.dom.title = this.collapsible ? this.collapsibleSplitTip : this.splitTip;
            }
            if(this.collapsible){
                this.splitEl.on("dblclick", this.onCollapseClick,  this);
            }
        },

        //docs inherit from superclass
        getSize : function(){
            if(this.isCollapsed){
                return this.collapsedEl.getSize();
            }
            var s = this.panel.getSize();
            if(this.position == 'north' || this.position == 'south'){
                s.height += this.splitEl.dom.offsetHeight;
            }else{
                s.width += this.splitEl.dom.offsetWidth;
            }
            return s;
        },

        // private
        getHMaxSize : function(){
             var cmax = this.maxSize || 10000;
             var center = this.layout.center;
             return Math.min(cmax, (this.el.getWidth()+center.el.getWidth())-center.getMinWidth());
        },

        // private
        getVMaxSize : function(){
            var cmax = this.maxSize || 10000;
            var center = this.layout.center;
            return Math.min(cmax, (this.el.getHeight()+center.el.getHeight())-center.getMinHeight());
        },

        // private
        onSplitMove : function(split, newSize){
            var s = this.panel.getSize();
            this.lastSplitSize = newSize;
            if(this.position == 'north' || this.position == 'south'){
                this.panel.setSize(s.width, newSize);
                this.state.height = newSize;
            }else{
                this.panel.setSize(newSize, s.height);
                this.state.width = newSize;
            }
            this.layout.layout();
            this.panel.saveState();
            return false;
        },

        /**
         * Returns a reference to the split bar in use by this region.
         * @return {Ext.SplitBar} The split bar
         */
        getSplitBar : function(){
            return this.split;
        },

        // inherit docs
        destroy : function() {
            Ext.destroy(this.miniSplitEl, this.split, this.splitEl);
            Ext.layout.BorderLayout.SplitRegion.superclass.destroy.call(this);
        }
    });

    Ext.Container.LAYOUTS['border'] = Ext.layout.BorderLayout;