    /**
     * This ComponentLayout handles docking for Panels. It takes care of panels that are
     * part of a ContainerLayout that sets this Panel's size and Panels that are part of
     * an AutoContainerLayout in which this panel get his height based of the CSS or
     * or its content.
     * @private
     */
    Ext.define('Ext.layout.component.Dock', {

        /* Begin Definitions */

        extend: 'Ext.layout.component.Component',

        alias: 'layout.dock',

        alternateClassName: 'Ext.layout.component.AbstractDock',

        /* End Definitions */

        type: 'dock',

        horzAxisProps: {
            name: 'horz',
            oppositeName: 'vert',
            dockBegin: 'left',
            dockEnd: 'right',
            horizontal: true,
            marginBegin: 'margin-left',
            maxSize: 'maxWidth',
            minSize: 'minWidth',
            pos: 'x',
            setSize: 'setWidth',
            shrinkWrapDock: 'shrinkWrapDockWidth',
            size: 'width',
            sizeModel: 'widthModel'
        },

        vertAxisProps: {
            name: 'vert',
            oppositeName: 'horz',
            dockBegin: 'top',
            dockEnd: 'bottom',
            horizontal: false,
            marginBegin: 'margin-top',
            maxSize: 'maxHeight',
            minSize: 'minHeight',
            pos: 'y',
            setSize: 'setHeight',
            shrinkWrapDock: 'shrinkWrapDockHeight',
            size: 'height',
            sizeModel: 'heightModel'
        },

        initializedBorders: -1,

        horizontalCollapsePolicy: { width: true, x: true },

        verticalCollapsePolicy: { height: true, y: true },

        finishRender: function () {
            var me = this,
                target, items;

            me.callParent();

            target = me.getRenderTarget();
            items = me.getDockedItems();

            me.finishRenderItems(target, items);
        },

        isItemBoxParent: function (itemContext) {
            return true;
        },

        isItemShrinkWrap: function (item) {
            return true;
        },

        noBorderClasses: [
            Ext.baseCSSPrefix + 'docked-noborder-top',
            Ext.baseCSSPrefix + 'docked-noborder-right',
            Ext.baseCSSPrefix + 'docked-noborder-bottom',
            Ext.baseCSSPrefix + 'docked-noborder-left'
        ],

        noBorderClassesSides: {
            top: Ext.baseCSSPrefix + 'docked-noborder-top',
            right: Ext.baseCSSPrefix + 'docked-noborder-right',
            bottom: Ext.baseCSSPrefix + 'docked-noborder-bottom',
            left: Ext.baseCSSPrefix + 'docked-noborder-left'
        },

        borderWidthProps: {
            top: 'border-top-width',
            right: 'border-right-width',
            bottom: 'border-bottom-width',
            left: 'border-left-width'
        },

        handleItemBorders: function() {
            var me = this,
                owner = me.owner,
                borders, docked,
                lastItems = me.lastDockedItems,
                oldBorders = me.borders,
                currentGeneration = owner.dockedItems.generation,
                noBorderClassesSides = me.noBorderClassesSides,
                borderWidthProps = me.borderWidthProps,
                i, ln, item, dock, side,
                collapsed = me.collapsed;

            if (me.initializedBorders == currentGeneration || (owner.border && !owner.manageBodyBorders)) {
                return;
            }

            me.initializedBorders = currentGeneration;

            // Borders have to be calculated using expanded docked item collection.
            me.collapsed = false;
            me.lastDockedItems = docked = me.getLayoutItems();
            me.collapsed = collapsed;

            borders = { top: [], right: [], bottom: [], left: [] };

            for (i = 0, ln = docked.length; i < ln; i++) {
                item = docked[i];
                dock = item.dock;

                if (item.ignoreBorderManagement) {
                    continue;
                }

                if (!borders[dock].satisfied) {
                    borders[dock].push(item);
                    borders[dock].satisfied = true;
                }

                if (!borders.top.satisfied && dock !== 'bottom') {
                    borders.top.push(item);
                }
                if (!borders.right.satisfied && dock !== 'left') {
                    borders.right.push(item);
                }
                if (!borders.bottom.satisfied && dock !== 'top') {
                    borders.bottom.push(item);
                }
                if (!borders.left.satisfied && dock !== 'right') {
                    borders.left.push(item);
                }
            }

            if (lastItems) {
                for (i = 0, ln = lastItems.length; i < ln; i++) {
                    item = lastItems[i];
                    if (!item.isDestroyed && !item.ignoreBorderManagement && !owner.manageBodyBorders) {
                        item.removeCls(me.noBorderClasses);
                    }
                }
            }

            if (oldBorders) {
                for (side in oldBorders) {
                    if (owner.manageBodyBorders && oldBorders[side].satisfied) {
                        owner.setBodyStyle(borderWidthProps[side], '');
                    }
                }
            }

            for (side in borders) {
                ln = borders[side].length;
                if (!owner.manageBodyBorders) {
                    for (i = 0; i < ln; i++) {
                        borders[side][i].addCls(noBorderClassesSides[side]);
                    }
                    if ((!borders[side].satisfied && !owner.bodyBorder) || owner.bodyBorder === false) {
                        owner.addBodyCls(noBorderClassesSides[side]);
                    }
                }
                else if (borders[side].satisfied) {
                    owner.setBodyStyle(borderWidthProps[side], '1px');
                }
            }

            me.borders = borders;
        },

        beforeLayoutCycle: function (ownerContext) {
            var me = this,
                owner = me.owner,
                shrinkWrap = me.sizeModels.shrinkWrap,
                shrinkWrapDock = owner.shrinkWrapDock,
                collapsedHorz, collapsedVert;

            if (owner.collapsed) {
                if (owner.collapsedVertical()) {
                    collapsedVert = true;
                    ownerContext.measureDimensions = 1;
                } else {
                    collapsedHorz = true;
                    ownerContext.measureDimensions = 2;
                }
            }

            ownerContext.collapsedVert = collapsedVert;
            ownerContext.collapsedHorz = collapsedHorz;

            // If we are collapsed, we want to auto-layout using the placeholder/expander
            // instead of the normal items/dockedItems. This must be done here since we could
            // be in a box layout w/stretchmax which sets the width/heightModel to allow it to
            // control the size.
            if (collapsedVert) {
                ownerContext.heightModel = shrinkWrap;
            } else if (collapsedHorz) {
                ownerContext.widthModel = shrinkWrap;
            }

            shrinkWrapDock = shrinkWrapDock === true ? 3 : (shrinkWrapDock || 0);
            ownerContext.shrinkWrapDockHeight = (shrinkWrapDock & 1) && ownerContext.heightModel.shrinkWrap;
            ownerContext.shrinkWrapDockWidth = (shrinkWrapDock & 2) && ownerContext.widthModel.shrinkWrap;
        },

        beginLayout: function(ownerContext) {
            var me = this,
                owner = me.owner,
                docked = me.getLayoutItems(),
                layoutContext = ownerContext.context,
                dockedItemCount = docked.length,
                dockedItems, i, item, itemContext, offsets,
                collapsed, dock;

            me.callParent(arguments);

            // Cache the children as ContextItems (like a Container). Also setup to handle
            // collapsed state:
            collapsed = owner.getCollapsed();
            if (collapsed !== me.lastCollapsedState && Ext.isDefined(me.lastCollapsedState)) {
                // If we are collapsing...
                if (me.owner.collapsed) {
                    ownerContext.isCollapsingOrExpanding = 1;
                    // Add the collapsed class now, so that collapsed CSS rules are applied before measurements are taken by the layout.
                    owner.addClsWithUI(owner.collapsedCls);
                } else {
                    ownerContext.isCollapsingOrExpanding = 2;
                    // Remove the collapsed class now, before layout calculations are done.
                    owner.removeClsWithUI(owner.collapsedCls);
                    ownerContext.lastCollapsedState = me.lastCollapsedState;
                }
            }
            me.lastCollapsedState = collapsed;

            ownerContext.dockedItems = dockedItems = [];

            for (i = 0; i < dockedItemCount; i++) {
                item = docked[i];
                if (item.rendered) {
                    dock = item.dock;
                    itemContext = layoutContext.getCmp(item);
                    itemContext.dockedAt = { x: 0, y: 0 };
                    itemContext.offsets = offsets = Ext.Element.parseBox(item.offsets || 0);
                    itemContext.horizontal = dock == 'top' || dock == 'bottom';
                    offsets.width = offsets.left + offsets.right;
                    offsets.height = offsets.top + offsets.bottom;
                    dockedItems.push(itemContext);
                }
            }

            ownerContext.bodyContext = ownerContext.getEl('body');
        },

        beginLayoutCycle: function(ownerContext) {
            var me = this,
                docked = ownerContext.dockedItems,
                len = docked.length,
                owner = me.owner,
                frameBody = owner.frameBody,
                lastHeightModel = me.lastHeightModel,
                i, item, dock;

            me.callParent(arguments);

            if (me.owner.manageHeight) {
                // Reset in case manageHeight gets turned on during lifecycle.
                // See below for why display could be set to non-default value.
                if (me.lastBodyDisplay) {
                    owner.body.dom.style.display = me.lastBodyDisplay = '';
                }
            } else {
                // When manageHeight is false, the body stretches the outer el by using wide margins to force it to
                // accommodate the docked items. When overflow is visible (when panel is resizable and has embedded handles),
                // the body must be inline-block so as not to collapse its margins
                if (me.lastBodyDisplay !== 'inline-block') {
                    owner.body.dom.style.display = me.lastBodyDisplay = 'inline-block';
                }

                if (lastHeightModel && lastHeightModel.shrinkWrap &&
                            !ownerContext.heightModel.shrinkWrap) {
                    owner.body.dom.style.marginBottom = '';
                }
            }

            if (ownerContext.widthModel.auto) {
                if (ownerContext.widthModel.shrinkWrap) {
                    owner.el.setWidth(null);
                }
                owner.body.setWidth(null);
                if (frameBody) {
                    frameBody.setWidth(null);
                }
            }
            if (ownerContext.heightModel.auto) {
                owner.body.setHeight(null);
                //owner.el.setHeight(null); Disable this for now
                if (frameBody) {
                    frameBody.setHeight(null);
                }
            }

            // Each time we begin (2nd+ would be due to invalidate) we need to publish the
            // known contentWidth/Height if we are collapsed:
            if (ownerContext.collapsedVert) {
                ownerContext.setContentHeight(0);
            } else if (ownerContext.collapsedHorz) {
                ownerContext.setContentWidth(0);
            }

            // dock: 'right' items, when a panel gets narrower get "squished". Moving them to
            // left:0px avoids this!
            for (i = 0; i < len; i++) {
                item = docked[i].target;
                dock = item.dock;

                if (dock == 'right') {
                    item.setLocalX(0);
                } else if (dock != 'left') {
                    continue;
                }

                // TODO - clear width/height?
            }
        },

        calculate: function (ownerContext) {
            var me = this,
                measure = me.measureAutoDimensions(ownerContext, ownerContext.measureDimensions),
                state = ownerContext.state,
                horzDone = state.horzDone,
                vertDone = state.vertDone,
                bodyContext = ownerContext.bodyContext,
                framing, horz, vert, forward, backward;

            // make sure we can use these value w/o calling methods to get them
            ownerContext.borderInfo  || ownerContext.getBorderInfo();
            ownerContext.paddingInfo || ownerContext.getPaddingInfo();
            ownerContext.frameInfo   || ownerContext.getFrameInfo();
            bodyContext.borderInfo   || bodyContext.getBorderInfo();
            bodyContext.paddingInfo  || bodyContext.getPaddingInfo();

            // On CSS3 browsers, the border and padding frame the outer el. On non-CSS3
            // browsers, the outer el has no border or padding - all that appears on the
            // framing elements as padding and height. In CSS3, the border size effects the
            // origin of the dockedItems but the padding does not (so that must be added in
            // most of the time). In non-CSS3 mode, the dockedItems are outside the framing:
            //
            //      ... top / left dockedItems ...
            //      <div id="...-ml" style="padding-left: border-radius-left;">
            //          <div id="...-mr" style="padding-right: border-radius-right;">
            //              <div id="...-mc" style="padding: extra;">
            //                  ... body ...
            //              </div>
            //          </div>
            //      </div>
            //      ... bottom / right dockedItems ...
            //
            // For the sake of sanity, we perform all the calculations in CSS3 mode. We test
            // for the presence of non-CSS3 framing only when necessary.
            //
            if (!ownerContext.frameBorder) {
                if (!(framing = ownerContext.framing)) {
                    ownerContext.frameBorder = ownerContext.borderInfo;
                    ownerContext.framePadding = ownerContext.paddingInfo;
                } else {
                    // These values match what they would have been in CSS3.
                    ownerContext.frameBorder = framing.border;
                    ownerContext.framePadding = framing.padding;
                }
            }

            // Start the axes so they are ready to proceed inwards (fixed-size) or outwards
            // (shrinkWrap) and stash key property names as well:
            horz = !horzDone &&
                   me.createAxis(ownerContext, measure.contentWidth, ownerContext.widthModel,
                                 me.horzAxisProps, ownerContext.collapsedHorz);
            vert = !vertDone &&
                   me.createAxis(ownerContext, measure.contentHeight, ownerContext.heightModel,
                                 me.vertAxisProps, ownerContext.collapsedVert);

            // We iterate forward and backward over the dockedItems at the same time based on
            // whether an axis is shrinkWrap or fixed-size. For a fixed-size axis, the outer box
            // axis is allocated to docked items in forward order and is reduced accordingly.
            // To handle a shrinkWrap axis, the box starts at the inner (body) size and is used to
            // size docked items in backwards order. This is because the last docked item shares
            // an edge with the body. The item size is used to adjust the shrinkWrap axis outwards
            // until the first docked item (at the outermost edge) is processed. This backwards
            // order ensures that docked items never get an incorrect size for any dimension.
            for (forward = 0, backward = ownerContext.dockedItems.length; backward--; ++forward) {
                if (horz) {
                    me.dockChild(ownerContext, horz, backward, forward);
                }
                if (vert) {
                    me.dockChild(ownerContext, vert, backward, forward);
                }
            }

            if (horz && me.finishAxis(ownerContext, horz)) {
                state.horzDone = horzDone = horz;
            }

            if (vert && me.finishAxis(ownerContext, vert)) {
                state.vertDone = vertDone = vert;
            }

            // Once all items are docked, the final size of the outer panel or inner body can
            // be determined. If we can determine both width and height, we are done.
            if (horzDone && vertDone && me.finishConstraints(ownerContext, horzDone, vertDone)) {
                // Size information is published as we dock items but position is hard to do
                // that way (while avoiding published multiple times) so we publish all the
                // positions at the end.
                me.finishPositions(ownerContext, horzDone, vertDone);
            } else {
                me.done = false;
            }
        },

        /**
         * Creates an axis object given the particulars. The process starts by placing the
         * dockedItems in an idealized box where this method is called once for each side.
         * The ideal box is defined by the CSS3 border and padding values (which account for
         * the influence of border-radius). The origin (the (0,0) point) of the ideal box is
         * the top-left edge of the border or the border-box. Normal dockedItems are placed
         * inside this box at an offset to clear the border and padding and sit properly in
         * the panel next to the body.
         *
         * The origin has to be started differently if the axis is in shrinkWrap mode. When
         * shrink-wrapping an axis, the axis starts at the edge of the body and expands
         * outwards as items are docked. This means the ideal (0,0) for shrinkWrap is on the
         * top-left corner of the body.
         *
         * The following diagram illustrates this using the vertical axis.
         *
         *      +---------------------------+ 10px (border)
         *      |                           |
         *      |  xxxxxxxxxxxxxxxxxxxxxxx  | 5px (padding)   shrinkWrap    other
         *      |  +=====================+  |                   -50         15
         *      |  |  Header             |  | 30px
         *      |  |                     |  |
         *      |  +=====================+  |
         *      |  +---------------------+  |                   -20         45
         *      |  |  tbar               |  | 20 px
         *      |  +---------------------+  |
         *      |  +---------------------+  |                   0           65
         *      |  |  Body               |  | 100px
         *      |  |                     |  |
         *      |  |                     |  |
         *      |  +---------------------+  |
         *      |  +---------------------+  |                   100         165
         *      |  |  bbar               |  | 15px
         *      |  +---------------------+  |
         *      |  xxxxxxxxxxxxxxxxxxxxxxx  | 5px
         *      |                           |
         *      +---------------------------+ 10px
         *
         * These are sufficient to determine sizes of things, but to finalize this process
         * and assign proper positions, the tentative coordinates have to be adjusted by an
         * amount appropriate for the item. Because dockedItems are position:absolute, they
         * sit inside the border and so must be adjusted for padding. The body is different
         * because it is position:relative and so it naturally sits inside the padding and
         * the padding must not be included in its position.
         *
         * Headers and footers that use `ignoreParentFrame` interact with this process by
         * moving themselves outside the border and padding. So in the above diagram, the
         * Header would move up by 15px and *everything else* would move up by 10px. When
         * shrinkWrap is taking place, the 10px of border on the top is removed from the
         * height as well.
         *
         * The bbar behaves slightly different when it is `ignoreParentFrame`. In shrinkWrap
         * mode, it alone would move down by the padding and the bottom border would not be
         * included in the height. Otherwise, the bbar would be moved down 15px (since the
         * edge is fixed) and the next dockedItem would be placed at, or the body would be
         * stretched down to, 5px (padding) pixels above the bbar.
         *
         * @private
         */
        createAxis: function (ownerContext, contentSize, sizeModel, axisProps, collapsedAxis) {
            var me = this,
                begin = 0,
                owner = me.owner,
                maxSize = owner[axisProps.maxSize],
                minSize = owner[axisProps.minSize] || 0,
                dockBegin = axisProps.dockBegin,
                dockEnd = axisProps.dockEnd,
                posProp = axisProps.pos,
                sizeProp = axisProps.size,
                hasMaxSize = maxSize != null, // exactly the same as "maxSize !== null && maxSize !== undefined"
                shrinkWrap = sizeModel.shrinkWrap,
                bodyContext, framing, padding, end;

            if (shrinkWrap) {
                // End position before adding docks around the content is content size plus the body borders in this axis.
                // If collapsed in this axis, the body borders will not be shown.
                if (collapsedAxis) {
                    end = 0;
                } else {
                    bodyContext = ownerContext.bodyContext;
                    end = contentSize + bodyContext.borderInfo[sizeProp];
                }
            } else {
                framing = ownerContext.frameBorder;
                padding = ownerContext.framePadding;

                begin = framing[dockBegin] + padding[dockBegin];
                end = ownerContext.getProp(sizeProp) - (framing[dockEnd] + padding[dockEnd]);
            }

            return {
                shrinkWrap: sizeModel.shrinkWrap,
                sizeModel: sizeModel,
                // An axis tracks start and end+1 px positions. eg 0 to 10 for 10px high
                initialBegin: begin,
                begin: begin,
                end: end,
                collapsed: collapsedAxis,
                horizontal: axisProps.horizontal,
                ignoreFrameBegin: null,
                ignoreFrameEnd: null,
                initialSize: end - begin,
                maxChildSize: 0,
                hasMinMaxConstraints: (minSize || hasMaxSize) && sizeModel.shrinkWrap,
                minSize: minSize,
                maxSize: hasMaxSize ? maxSize : 1e9,
                bodyPosProp: me.owner.manageHeight ? posProp : axisProps.marginBegin,
                dockBegin: dockBegin,    // 'left' or 'top'
                dockEnd: dockEnd,        // 'right' or 'end'
                posProp: posProp,        // 'x' or 'y'
                sizeProp: sizeProp,      // 'width' or 'height'
                setSize: axisProps.setSize,
                shrinkWrapDock: ownerContext[axisProps.shrinkWrapDock],
                sizeModelName: axisProps.sizeModel,
                dockedPixelsEnd: 0
            };
        },

        /**
         * Docks a child item on the specified axis. This boils down to determining if the item
         * is docked at the "beginning" of the axis ("left" if horizontal, "top" if vertical),
         * the "end" of the axis ("right" if horizontal, "bottom" if vertical) or stretches
         * along the axis ("top" or "bottom" if horizontal, "left" or "right" if vertical). It
         * also has to differentiate between fixed and shrinkWrap sized dimensions.
         * @private
         */
        dockChild: function (ownerContext, axis, backward, forward) {
            var me = this,
                itemContext = ownerContext.dockedItems[axis.shrinkWrap ? backward : forward],
                item = itemContext.target,
                dock = item.dock, // left/top/right/bottom
                sizeProp = axis.sizeProp,
                pos, size;

            if (item.ignoreParentFrame && ownerContext.isCollapsingOrExpanding) {
                // collapsed window header margins may differ from expanded window header margins
                // so we need to make sure the old cached values are not used in axis calculations
                itemContext.clearMarginCache();
            }

            itemContext.marginInfo || itemContext.getMarginInfo(); // get marginInfo ready

            if (dock == axis.dockBegin) {
                if (axis.shrinkWrap) {
                    pos = me.dockOutwardBegin(ownerContext, itemContext, item, axis);
                } else {
                    pos = me.dockInwardBegin(ownerContext, itemContext, item, axis);
                }
            } else if (dock == axis.dockEnd) {
                if (axis.shrinkWrap) {
                    pos = me.dockOutwardEnd(ownerContext, itemContext, item, axis);
                } else {
                    pos = me.dockInwardEnd(ownerContext, itemContext, item, axis);
                }
            } else {
                if (axis.shrinkWrapDock) {
                    // we are still shrinkwrapping transversely... so we need to include the
                    // size of this item in the max calculation
                    size = itemContext.getProp(sizeProp) + itemContext.marginInfo[sizeProp];
                    axis.maxChildSize = Math.max(axis.maxChildSize, size);
                    pos = 0;
                } else {
                    pos = me.dockStretch(ownerContext, itemContext, item, axis);
                }
            }

            itemContext.dockedAt[axis.posProp] = pos;
        },

        /**
         * Docks an item on a fixed-size axis at the "beginning". The "beginning" of the horizontal
         * axis is "left" and the vertical is "top". For a fixed-size axis, the size works from
         * the outer element (the panel) towards the body.
         * @private
         */
        dockInwardBegin: function (ownerContext, itemContext, item, axis) {
            var pos = axis.begin,
                sizeProp = axis.sizeProp,
                ignoreParentFrame = item.ignoreParentFrame,
                delta,
                size,
                dock;

            if (ignoreParentFrame) {
                axis.ignoreFrameBegin = itemContext;
                dock = item.dock;

                // We need to move everything up by the border-width.
                delta = ownerContext.frameBorder[dock];

                // We need to move the header "up" by the padding as well.
                pos -= delta + ownerContext.framePadding[dock];
            }

            if (!item.overlay) {
                size = itemContext.getProp(sizeProp) + itemContext.marginInfo[sizeProp];
                axis.begin += size;
                if (ignoreParentFrame) {
                    axis.begin -= delta;
                }
            }

            return pos;
        },

        /**
         * Docks an item on a fixed-size axis at the "end". The "end" of the horizontal axis is
         * "right" and the vertical is "bottom".
         * @private
         */
        dockInwardEnd: function (ownerContext, itemContext, item, axis) {
            var sizeProp = axis.sizeProp,
                size = itemContext.getProp(sizeProp) + itemContext.marginInfo[sizeProp],
                pos = axis.end - size,
                frameEnd;

            if (!item.overlay) {
                axis.end = pos;
            }

            if (item.ignoreParentFrame) {
                axis.ignoreFrameEnd = itemContext;
                frameEnd = ownerContext.frameBorder[item.dock];
                pos += frameEnd + ownerContext.framePadding[item.dock];
                axis.end += frameEnd;
            }

            return pos;
        },

        /**
         * Docks an item on a shrinkWrap axis at the "beginning". The "beginning" of the horizontal
         * axis is "left" and the vertical is "top". For a shrinkWrap axis, the size works from
         * the body outward to the outermost element (the panel).
         *
         * During the docking process, coordinates are allowed to be negative. We start with the
         * body at (0,0) so items docked "top" or "left" will simply be assigned negative x/y. In
         * the {@link #finishPositions} method these are corrected and framing is added. This way
         * the correction is applied as a simple translation of delta x/y on all coordinates to
         * bring the origin back to (0,0).
         * @private
         */
        dockOutwardBegin: function (ownerContext, itemContext, item, axis) {
            var pos = axis.begin,
                sizeProp = axis.sizeProp,
                size;

            if (axis.collapsed) {
                axis.ignoreFrameBegin = axis.ignoreFrameEnd = itemContext;
            } else if (item.ignoreParentFrame) {
                axis.ignoreFrameBegin = itemContext;
            }
            // NOTE - When shrinkWrapping an ignoreParentFrame, this must be the last item
            // on the axis. Since that is so, we let finishAxis take this in to account.

            if (!item.overlay) {
                size = itemContext.getProp(sizeProp) + itemContext.marginInfo[sizeProp];
                pos -= size;
                axis.begin = pos;
            }

            return pos;
        },

        /**
         * Docks an item on a shrinkWrap axis at the "end". The "end" of the horizontal axis is
         * "right" and the vertical is "bottom".
         * @private
         */
        dockOutwardEnd: function (ownerContext, itemContext, item, axis) {
            var pos = axis.end,
                sizeProp = axis.sizeProp,
                size;

            size = itemContext.getProp(sizeProp) + itemContext.marginInfo[sizeProp];

            if (axis.collapsed) {
                axis.ignoreFrameBegin = axis.ignoreFrameEnd = itemContext;
            } else if (item.ignoreParentFrame) {
                axis.ignoreFrameEnd = itemContext;
            }
            // NOTE - When shrinkWrapping an ignoreParentFrame, this must be the last item
            // on the axis. Since that is so, we let finishAxis take this in to account.

            if (!item.overlay) {
                axis.end = pos + size;
                axis.dockedPixelsEnd += size;
            }

            return pos;
        },

        /**
         * Docks an item that might stretch across an axis. This is done for dock "top" and
         * "bottom" items on the horizontal axis and dock "left" and "right" on the vertical.
         * @private
         */
        dockStretch: function (ownerContext, itemContext, item, axis) {
            var dock = item.dock, // left/top/right/bottom (also used to index padding/border)
                sizeProp = axis.sizeProp, // 'width' or 'height'
                horizontal = dock == 'top' || dock == 'bottom',
                border = ownerContext.frameBorder,
                offsets = itemContext.offsets,
                padding = ownerContext.framePadding,
                endProp = horizontal ? 'right' : 'bottom',
                startProp = horizontal ? 'left' : 'top',
                pos = axis.begin + offsets[startProp],
                margin, size;

            if (item.stretch !== false) {
                size = axis.end - pos - offsets[endProp];

                if (item.ignoreParentFrame) {
                    // In CSS3, the border and padding need to be ignored specifically. In
                    // non-CSS3 / framing mode, the border and padding will be 0 **but** the
                    // header is not rendered inside the framing elements and so we do not
                    // want to do anything anyway!
                    pos -= padding[startProp] + border[startProp];
                    size += padding[sizeProp] + border[sizeProp];
                }

                margin = itemContext.marginInfo;
                size -= margin[sizeProp];

                itemContext[axis.setSize](size);
            }

            return pos;
        },

        /**
         * Finishes the calculation of an axis by determining its size. In non-shrink-wrap
         * cases, this is also where we set the body size.
         * @private
         */
        finishAxis: function (ownerContext, axis) {
            // If the maxChildSize is NaN it means at some point we tried to determine
            // The size of a docked item but we couldn't, so just jump out straight
            // away before doing any other processing
            if (isNaN(axis.maxChildSize)) {
                return false;
            }

            var axisBegin = axis.begin,
                size = axis.end - axisBegin,
                collapsed = axis.collapsed,
                setSizeMethod = axis.setSize,
                beginName = axis.dockBegin, // left or top
                endName = axis.dockEnd, // right or bottom
                padding = ownerContext.framePadding,
                border = ownerContext.frameBorder,
                borderBegin = border[beginName],
                framing = ownerContext.framing,
                framingBegin = framing && framing[beginName],
                // The padding is in play unless the axis is collapsed.
                paddingBegin = collapsed ? 0 : padding[beginName],
                sizeProp = axis.sizeProp,
                ignoreFrameBegin = axis.ignoreFrameBegin,
                ignoreFrameEnd = axis.ignoreFrameEnd,
                bodyContext = ownerContext.bodyContext,
                extraPaddingBegin = Math.max(borderBegin + paddingBegin - framingBegin, 0),
                bodyPos, bodySize, delta, dirty;

            if (axis.shrinkWrap) {
                // Since items docked left/top on a shrinkWrap axis go into negative coordinates,
                // we apply a delta to all coordinates to adjust their relative origin back to
                // a (0,0) inside the border.

                bodySize = axis.initialSize;

                if (framing) {
                    // In CSS3 mode, things are compartively simple because "framing" is just
                    // borders and padding. In non-CSS3 mode, however, the framing elements
                    // are given a size equal to the max of the border-width and border-radius
                    // and this pushes the body down accordingly. Further, the dockedItems are
                    // all rendered outside the framing elements, so their origin equals the
                    // ideal box origin. To translate this to match CSS3, we have to add on
                    // the border-top.

                    delta = -axisBegin + borderBegin + paddingBegin;
                    bodyPos = delta - framingBegin - extraPaddingBegin;
                } else {
                    bodyPos = -axisBegin;
                    delta = bodyPos + paddingBegin;
                }

                if (!collapsed) {
                    size += padding[sizeProp];
                }

                if (ignoreFrameBegin) {
                    // When some component ignores the begin framing, we move everything "up"
                    // by that amount of framing. We also do not include that amount of the
                    // framing in the shrinkWrap size.
                    delta -= borderBegin;
                    bodyPos -= borderBegin;

                    // The item ignoring the framing must also escape the padding. Since the
                    // axis.delta includes the padding and we want to apply this to only the
                    // one item, we just poke its dockedAt.x/y property so that when we add
                    // axis.begin the padding will cancel out. (Note: when we are collapsed
                    // paddingBegin will be 0).

                    ignoreFrameBegin.dockedAt[axis.posProp] -= paddingBegin;
                } else {
                    size += borderBegin;
                }

                if (collapsed) {
                    // in this case "ignoreFrameBegin === ignoreFrameEnd" so we can take the
                    // special cases out of the mix here...
                } else if (ignoreFrameEnd) {
                    // When a component ignores the end framing, we simply move it further
                    // "down" by the end padding and we do not add the end framing to the
                    // shrinkWrap size.
                    ignoreFrameEnd.dockedAt[axis.posProp] += padding[endName];
                } else {
                    size += border[endName];
                }

                axis.size = size; // we have to wait for min/maxWidth/Height processing

                if (!axis.horizontal && !this.owner.manageHeight) {
                    // the height of the bodyEl will give the proper height to the outerEl so
                    // we don't need to set heights in the DOM
                    dirty = false;
                }
            } else {
                // For a fixed-size axis, we started at the outer box and already have the
                // proper origin... almost... except for the owner's border.
                if (framing) {
                    // since dockedItems are rendered outside the framing, they have the
                    // proper origin already:
                    delta = 0;
                    bodyPos = axisBegin - framingBegin - extraPaddingBegin;
                } else {
                    delta = -borderBegin;
                    bodyPos = axisBegin - paddingBegin - borderBegin;
                }

                // Body size is remaining space between ends of Axis.
                bodySize = size;
            }

            axis.delta = delta;
            bodyContext[setSizeMethod](bodySize, dirty);
            bodyContext.setProp(axis.bodyPosProp, bodyPos);

            return !isNaN(size);
        },

        beforeInvalidateShrinkWrapDock: function(itemContext, options){
            var sizeModelName = options.axis.sizeModelName;
            if (!itemContext[sizeModelName].constrainedMin) {
                // if the child hit a min constraint, it needs to be at its configured size, so
                // we leave the sizeModel alone
                itemContext[sizeModelName] = Ext.layout.SizeModel.calculated;
            }
        },

        afterInvalidateShrinkWrapDock: function(itemContext, options){
            var axis = options.axis,
                me = options.layout,
                pos;

            if (itemContext[axis.sizeModelName].calculated) {
                pos = me.dockStretch(options.ownerContext, itemContext, itemContext.target, axis);
                itemContext.setProp(axis.posProp, axis.delta + pos);
            }
        },

        /**
         * Finishes processing of each axis by applying the min/max size constraints.
         * @private
         */
        finishConstraints: function (ownerContext, horz, vert) {
            var me = this,
                sizeModels = me.sizeModels,
                publishWidth = horz.shrinkWrap,
                publishHeight = vert.shrinkWrap,
                owner = me.owner,
                dirty, height, width, heightModel, widthModel, size,
                minSize, maxSize, maxChildSize, desiredSize;

            // In these calculations, maxChildSize will only be > 0 in the scenario where
            // we are dock shrink wrapping in that direction, otherwise it is not measured.
            // As such, the additions are done to simplify the logic, even though in most
            // cases, it will have no impact on the overall result.

            if (publishWidth) {
                size = horz.size;
                minSize = horz.collapsed ? 0 : horz.minSize;
                maxSize = horz.maxSize;
                maxChildSize = horz.maxChildSize;
                desiredSize = Math.max(size, maxChildSize);

                if (desiredSize > maxSize) {
                    widthModel = sizeModels.constrainedMax;
                    width = maxSize;
                } else if (desiredSize < minSize) {
                    widthModel = sizeModels.constrainedMin;
                    width = minSize;
                } else if (size < maxChildSize) {
                    widthModel = sizeModels.constrainedDock;
                    owner.dockConstrainedWidth = width = maxChildSize;
                } else {
                    width = size;
                }
            }

            if (publishHeight) {
                size = vert.size;
                minSize = vert.collapsed ? 0 : vert.minSize;
                maxSize = vert.maxSize;
                maxChildSize = vert.maxChildSize;
                // For vertical docks, their weighting means the height is affected by top/bottom
                // docked items, so we need to subtract them here
                desiredSize = Math.max(size, maxChildSize + size - vert.initialSize);

                if (desiredSize > maxSize) {
                    heightModel = sizeModels.constrainedMax;
                    height = maxSize;
                } else if (desiredSize < minSize) {
                    heightModel = sizeModels.constrainedMin;
                    height = minSize;
                } else if (size < maxChildSize) {
                    heightModel = sizeModels.constrainedDock;
                    owner.dockConstrainedHeight = height = maxChildSize;
                } else {
                    if (!ownerContext.collapsedVert && !owner.manageHeight) {
                        // height of the outerEl is provided by the height (including margins)
                        // of the bodyEl, so this value does not need to be written to the DOM
                        dirty = false;

                        // so long as we set top and bottom margins on the bodyEl!
                        ownerContext.bodyContext.setProp('margin-bottom', vert.dockedPixelsEnd);
                    }

                    height = size;
                }
            }

            // Handle the constraints...

            if (widthModel || heightModel) {
                // See ContextItem#init for an analysis of why this case is special. Basically,
                // in this case, we only know the width and the height could be anything.
                if (widthModel && heightModel &&
                            widthModel.constrainedMax &&  heightModel.constrainedByMin) {
                    ownerContext.invalidate({ widthModel: widthModel });
                    return false;
                }

                // To process a width or height other than that to which we have shrinkWrapped,
                // we need to invalidate our component and carry forward w/these constrains...
                // unless the ownerLayout wants these results and will invalidate us anyway.
                if (!ownerContext.widthModel.calculatedFromShrinkWrap &&
                            !ownerContext.heightModel.calculatedFromShrinkWrap) {
                    // nope, just us to handle the constraint...
                    ownerContext.invalidate({ widthModel: widthModel, heightModel: heightModel });
                    return false;
                }

                // We have a constraint to deal with, so we just adjust the size models and
                // allow the ownerLayout to invalidate us with its contribution to our final
                // size...
            } else {
                // We're not invalidating, the ownerContext, so if we're shrink wrapping we'll need to
                // tell any docked items to invalidate themselves if necessary.'
                me.invalidateAxes(ownerContext, horz, vert);

            }

            // we only publish the sizes if we are not invalidating the result...

            if (publishWidth) {
                ownerContext.setWidth(width);
                if (widthModel) {
                    ownerContext.widthModel = widthModel; // important to the ownerLayout
                }
            }
            if (publishHeight) {
                ownerContext.setHeight(height, dirty);
                if (heightModel) {
                    ownerContext.heightModel = heightModel; // important to the ownerLayout
                }
            }

            return true;
        },

        /**
         *
         * The default weighting of docked items produces this arrangement:
         *
         *      +--------------------------------------------+
         *      |                    Top 1                   |
         *      +--------------------------------------------+
         *      |                    Top 2                   |
         *      +-----+-----+--------------------+-----+-----+
         *      |     |     |                    |     |     |
         *      |     |     |                    |     |     |
         *      |     |     |                    |  R  |  R  |
         *      |  L  |  L  |                    |  I  |  I  |
         *      |  E  |  E  |                    |  G  |  G  |
         *      |  F  |  F  |                    |  H  |  H  |
         *      |  T  |  T  |                    |  T  |  T  |
         *      |     |     |                    |     |     |
         *      |  2  |  1  |                    |  1  |  2  |
         *      |     |     |                    |     |     |
         *      |     |     |                    |     |     |
         *      +-----+-----+--------------------+-----+-----+
         *      |                  Bottom 1                  |
         *      +--------------------------------------------+
         *      |                  Bottom 2                  |
         *      +--------------------------------------------+
         *
         * So when we are shrinkWrapDock on the horizontal, the stretch size for top/bottom
         * docked items is the final axis size. For the vertical axis, however, the stretch
         *
         */
        invalidateAxes: function(ownerContext, horz, vert){
            var before = this.beforeInvalidateShrinkWrapDock,
                after = this.afterInvalidateShrinkWrapDock,
                horzSize = horz.end - horz.begin,
                vertSize = vert.initialSize,
                invalidateHorz = horz.shrinkWrapDock && horz.maxChildSize < horzSize,
                invalidateVert = vert.shrinkWrapDock && vert.maxChildSize < vertSize,
                dockedItems, len, i, itemContext, itemSize, isHorz, axis, sizeProp;

            if (invalidateHorz || invalidateVert) {
                if (invalidateVert) {
                    // For vertical, we need to reset the initial position because they are affected
                    // by the horizontally docked items
                    vert.begin = vert.initialBegin;
                    vert.end = vert.begin + vert.initialSize;
                }
                dockedItems = ownerContext.dockedItems;
                for (i = 0, len = dockedItems.length; i < len; ++i) {
                    itemContext = dockedItems[i];
                    isHorz = itemContext.horizontal;
                    axis = null;
                    if (invalidateHorz && isHorz) {
                        sizeProp = horz.sizeProp;
                        itemSize = horzSize;
                        axis = horz;
                    } else if (invalidateVert && !isHorz) {
                        sizeProp = vert.sizeProp;
                        itemSize = vertSize;
                        axis = vert;
                    }

                    if (axis) {
                        // subtract any margins
                        itemSize -= itemContext.getMarginInfo()[sizeProp];
                        if (itemSize !== itemContext.props[sizeProp]) {
                            itemContext.invalidate({
                                before: before,
                                after: after,
                                axis: axis,
                                ownerContext: ownerContext,
                                layout: this
                            });
                        }
                    }
                }
            }
        },

        /**
         * Finishes the calculation by setting positions on the body and all of the items.
         * @private
         */
        finishPositions: function (ownerContext, horz, vert) {
            var dockedItems = ownerContext.dockedItems,
                length = dockedItems.length,
                deltaX = horz.delta,
                deltaY = vert.delta,
                index, itemContext;

            for (index = 0; index < length; ++index) {
                itemContext = dockedItems[index];

                itemContext.setProp('x', deltaX + itemContext.dockedAt.x);
                itemContext.setProp('y', deltaY + itemContext.dockedAt.y);
            }
        },

        finishedLayout: function(ownerContext) {
            var me = this,
                target = ownerContext.target;

            me.callParent(arguments);

            if (!ownerContext.animatePolicy) {
                if (ownerContext.isCollapsingOrExpanding === 1) {
                    target.afterCollapse(false);
                } else if (ownerContext.isCollapsingOrExpanding === 2) {
                    target.afterExpand(false);
                }
            }
        },

        getAnimatePolicy: function(ownerContext) {
            var me = this,
                lastCollapsedState, policy;

            if (ownerContext.isCollapsingOrExpanding == 1) {
                lastCollapsedState = me.lastCollapsedState;
            } else if (ownerContext.isCollapsingOrExpanding == 2) {
                lastCollapsedState = ownerContext.lastCollapsedState;
            }

            if (lastCollapsedState == 'left' || lastCollapsedState == 'right') {
                policy = me.horizontalCollapsePolicy;
            } else if (lastCollapsedState == 'top' || lastCollapsedState == 'bottom') {
                policy = me.verticalCollapsePolicy;
            }

            return policy;
        },

        /**
         * Retrieve an ordered and/or filtered array of all docked Components.
         * @param {String} [order='render'] The desired ordering of the items ('render' or 'visual').
         * @param {Boolean} [beforeBody] An optional flag to limit the set of items to only those
         *  before the body (true) or after the body (false). All components are returned by
         *  default.
         * @return {Ext.Component[]} An array of components.
         * @protected
         */
        getDockedItems: function(order, beforeBody) {
            var me = this,
                renderedOnly = (order === 'visual'),
                all = renderedOnly ? Ext.ComponentQuery.query('[rendered]', me.owner.dockedItems.items) : me.owner.dockedItems.items,
                sort = all && all.length && order !== false,
                renderOrder,
                dock, dockedItems, i, isBefore, length;

            if (beforeBody == null) {
                dockedItems = sort && !renderedOnly ? all.slice() : all;
            } else {
                dockedItems = [];

                for (i = 0, length = all.length; i < length; ++i) {
                    dock = all[i].dock;
                    isBefore = (dock == 'top' || dock == 'left');
                    if (beforeBody ? isBefore : !isBefore) {
                        dockedItems.push(all[i]);
                    }
                }

                sort = sort && dockedItems.length;
            }

            if (sort) {
                renderOrder = (order = order || 'render') == 'render';
                Ext.Array.sort(dockedItems, function(a, b) {
                    var aw,
                        bw;

                    // If the two items are on opposite sides of the body, they must not be sorted by any weight value:
                    // For rendering purposes, left/top *always* sorts before right/bottom
                    if (renderOrder && ((aw = me.owner.dockOrder[a.dock]) !== (bw = me.owner.dockOrder[b.dock]))) {

                        // The two dockOrder values cancel out when two items are on opposite sides.
                        if (!(aw + bw)) {
                            return aw - bw;
                        }
                    }

                    aw = me.getItemWeight(a, order);
                    bw = me.getItemWeight(b, order);
                    if ((aw !== undefined) && (bw !== undefined)) {
                        return aw - bw;
                    }
                    return 0;
                });
            }

            return dockedItems || [];
        },

        getItemWeight: function (item, order) {
            var weight = item.weight || this.owner.defaultDockWeights[item.dock];
            return weight[order] || weight;
        },

        /**
         * @protected
         * Returns an array containing all the **visible** docked items inside this layout's owner Panel
         * @return {Array} An array containing all the **visible** docked items of the Panel
         */
        getLayoutItems : function() {
            var me = this,
                items,
                itemCount,
                item,
                i,
                result;

            if (me.owner.collapsed) {
                result = me.owner.getCollapsedDockedItems();
            } else {
                items = me.getDockedItems('visual');
                itemCount = items.length;
                result = [];
                for (i = 0; i < itemCount; i++) {
                    item = items[i];
                    if (!item.hidden) {
                        result.push(item);
                    }
                }
            }
            return result;
        },

        // Content size includes padding but not borders, so subtract them off
        measureContentWidth: function (ownerContext) {
            var bodyContext = ownerContext.bodyContext;
            return bodyContext.el.getWidth() - bodyContext.getBorderInfo().width;
        },

        measureContentHeight: function (ownerContext) {
            var bodyContext = ownerContext.bodyContext;
            return bodyContext.el.getHeight() - bodyContext.getBorderInfo().height;
        },

        redoLayout: function(ownerContext) {
            var me = this,
                owner = me.owner;

            // If we are collapsing...
            if (ownerContext.isCollapsingOrExpanding == 1) {
                if (owner.reExpander) {
                    owner.reExpander.el.show();
                }
                // Add the collapsed class now, so that collapsed CSS rules are applied before measurements are taken by the layout.
                owner.addClsWithUI(owner.collapsedCls);
                ownerContext.redo(true);
            } else if (ownerContext.isCollapsingOrExpanding == 2) {
                // Remove the collapsed class now, before layout calculations are done.
                owner.removeClsWithUI(owner.collapsedCls);
                ownerContext.bodyContext.redo();
            }
        },

        // @private override inherited.
        // We need to render in the correct order, top/left before bottom/right
        renderChildren: function() {
            var me = this,
                items = me.getDockedItems(),
                target = me.getRenderTarget();

            me.handleItemBorders();

            me.renderItems(items, target);
        },

        /**
         * @protected
         * Render the top and left docked items before any existing DOM nodes in our render target,
         * and then render the right and bottom docked items after. This is important, for such things
         * as tab stops and ARIA readers, that the DOM nodes are in a meaningful order.
         * Our collection of docked items will already be ordered via Panel.getDockedItems().
         */
        renderItems: function(items, target) {
            var me = this,
                dockedItemCount = items.length,
                itemIndex = 0,
                correctPosition = 0,
                staticNodeCount = 0,
                targetNodes = me.getRenderTarget().dom.childNodes,
                targetChildCount = targetNodes.length,
                i, j, targetChildNode, item;

            // Calculate the number of DOM nodes in our target that are not our docked items
            for (i = 0, j = 0; i < targetChildCount; i++) {
                targetChildNode = targetNodes[i];
                if (Ext.fly(targetChildNode).hasCls(Ext.baseCSSPrefix + 'resizable-handle')) {
                    break;
                }
                for (j = 0; j < dockedItemCount; j++) {
                    item = items[j];
                    if (item.rendered && item.el.dom === targetChildNode) {
                        break;
                    }
                }
                // Walked off the end of the docked items without matching the found child node;
                // Then it's a static node.
                if (j === dockedItemCount) {
                    staticNodeCount++;
                }
            }

            // Now we go through our docked items and render/move them
            for (; itemIndex < dockedItemCount; itemIndex++, correctPosition++) {
                item = items[itemIndex];

                // If we're now at the first right/bottom docked item, we jump over the body element.
                //
                // TODO: This is affected if users provide custom weight values to their
                // docked items, which puts it out of (t,l,r,b) order. Avoiding a second
                // sort operation here, for now, in the name of performance. getDockedItems()
                // needs the sort operation not just for this layout-time rendering, but
                // also for getRefItems() to return a logical ordering (FocusManager, CQ, et al).
                if (itemIndex === correctPosition && (item.dock === 'right' || item.dock === 'bottom')) {
                    correctPosition += staticNodeCount;
                }

                // Same logic as Layout.renderItems()
                if (item && !item.rendered) {
                    me.renderItem(item, target, correctPosition);
                }
                else if (!me.isValidParent(item, target, correctPosition)) {
                    me.moveItem(item, target, correctPosition);
                }
            }
        },

        undoLayout: function(ownerContext) {
            var me = this,
                owner = me.owner;

            // If we are collapsing...
            if (ownerContext.isCollapsingOrExpanding == 1) {

                // We do not want to see the re-expander header until the final collapse is complete
                if (owner.reExpander) {
                    owner.reExpander.el.hide();
                }
                // Add the collapsed class now, so that collapsed CSS rules are applied before measurements are taken by the layout.
                owner.removeClsWithUI(owner.collapsedCls);
                ownerContext.undo(true);
            } else if (ownerContext.isCollapsingOrExpanding == 2) {
                // Remove the collapsed class now, before layout calculations are done.
                owner.addClsWithUI(owner.collapsedCls);
                ownerContext.bodyContext.undo();
            }
        },

        sizePolicy: {
            nostretch: {
                setsWidth: 0,
                setsHeight: 0
            },

            horz: { // item goes horizontally (top or bottom docked)
                shrinkWrap: {
                    // This is how we manage the width of a top/bottom docked item when its
                    // shrinkWrapWidth and ours need to be maxed (calculatedFromShrinkWrap)
                    setsWidth: 1,
                    setsHeight: 0,
                    readsWidth: 1
                },
                stretch: {
                    setsWidth: 1,
                    setsHeight: 0
                }
            },

            vert: { // item goes vertically (left or right docked)
                shrinkWrap: {
                    setsWidth: 0,
                    setsHeight: 1,
                    readsHeight: 1
                },
                stretch: {
                    setsWidth: 0,
                    setsHeight: 1
                }
            },

            stretchV: {
                setsWidth: 0,
                setsHeight: 1
            },

            // Circular dependency with partial auto-sized panels:
            //
            // If we have an autoHeight docked item being stretched horizontally (top/bottom),
            // that stretching will determine its width and its width must be set before its
            // autoHeight can be determined. If that item is docked in an autoWidth panel, the
            // body will need its height set before it can determine its width, but the height
            // of the docked item is needed to subtract from the panel height in order to set
            // the body height.
            //
            // This same pattern occurs with autoHeight panels with autoWidth docked items on
            // left or right. If the panel is fully auto or fully fixed, these problems don't
            // come up because there is no dependency between the dimensions.
            //
            // Cutting the Gordian Knot: In these cases, we have to allow something to measure
            // itself without full context. This is OK as long as the managed dimension doesn't
            // effect the auto-dimension, which is often the case for things like toolbars. The
            // managed dimension only effects overflow handlers and such and does not change the
            // auto-dimension. To encourage the item to measure itself without waiting for the
            // managed dimension, we have to tell it that the layout will also be reading that
            // dimension. This is similar to how stretchmax works.

            autoStretchH: {
                readsWidth: 1,
                setsWidth: 1,
                setsHeight: 0
            },
            autoStretchV: {
                readsHeight: 1,
                setsWidth: 0,
                setsHeight: 1
            }
        },

        getItemSizePolicy: function (item, ownerSizeModel) {
            var me = this,
                policy = me.sizePolicy,
                shrinkWrapDock = me.owner.shrinkWrapDock,
                dock, vertical;

            if (item.stretch === false) {
                return policy.nostretch;
            }

            dock = item.dock;
            vertical = (dock == 'left' || dock == 'right');

            shrinkWrapDock = shrinkWrapDock === true ? 3 : (shrinkWrapDock || 0);
            if (vertical) {
                policy = policy.vert;
                shrinkWrapDock = shrinkWrapDock & 1;
            } else {
                policy = policy.horz;
                shrinkWrapDock = shrinkWrapDock & 2;
            }

            if (shrinkWrapDock) {
                // Getting the size model is expensive, so only do so if we really need it
                if (!ownerSizeModel) {
                    ownerSizeModel = me.owner.getSizeModel();
                }
                if (ownerSizeModel[vertical ? 'height' : 'width'].shrinkWrap) {
                    return policy.shrinkWrap;
                }
            }

            return policy.stretch;
        },

        /**
         * @protected
         * We are overriding the Ext.layout.Layout configureItem method to also add a class that
         * indicates the position of the docked item. We use the itemCls (x-docked) as a prefix.
         * An example of a class added to a dock: right item is x-docked-right
         * @param {Ext.Component} item The item we are configuring
         */
        configureItem : function(item, pos) {
            this.callParent(arguments);

            item.addCls(Ext.baseCSSPrefix + 'docked');
            item.addClsWithUI(this.getDockCls(item.dock));
        },

        /**
         * Get's the css class name for a given dock position.
         * @param {String} dock `top`, `right`, `bottom`, or `left`
         * @return {String}
         * @private
         */
        getDockCls: function(dock) {
            return 'docked-' + dock;
        },

        afterRemove : function(item) {
            this.callParent(arguments);
            if (this.itemCls) {
                item.el.removeCls(this.itemCls + '-' + item.dock);
            }
            var dom = item.el.dom;

            if (!item.destroying && dom) {
                dom.parentNode.removeChild(dom);
            }
            this.childrenChanged = true;
        },

        /**
         * This object is indexed by a component's `baseCls` to yield another object which
         * is then indexed by the component's `ui` to produce an array of CSS class names.
         * This array is indexed in the same manner as the `noBorderClassTable` and indicates
         * the a particular edge of a docked item or the body element is actually "collapsed"
         * with the component's outer border.
         * @private
         */
        borderCollapseMap: {
            /*
            'x-panel': {
                'default': []
            }
            */
        },

        /**
         * Returns the array of class names to add to a docked item or body element when for
         * the edges that should collapse with the outer component border. Basically, the
         * panel's outer border must look visually like a contiguous border but may need to
         * be realized by using the border of docked items and/or the body. This class name
         * allows the border color and width to be controlled accordingly and distinctly from
         * the border of the docked item or body element when it is not having its border
         * collapsed.
         * @private
         */
        getBorderCollapseTable: function () {
            var me = this,
                map = me.borderCollapseMap,
                owner = me.owner,
                baseCls = owner.baseCls,
                ui = owner.ui,
                table;

            map = map[baseCls] || (map[baseCls] = {});
            table = map[ui];

            if (!table) {
                baseCls += '-' + ui + '-outer-border-';
                map[ui] = table = [
                    0,                  // TRBL
                    baseCls + 'l',      // 0001 = 1
                    baseCls + 'b',      // 0010 = 2
                    baseCls + 'bl',     // 0011 = 3
                    baseCls + 'r',      // 0100 = 4
                    baseCls + 'rl',     // 0101 = 5
                    baseCls + 'rb',     // 0110 = 6
                    baseCls + 'rbl',    // 0111 = 7
                    baseCls + 't',      // 1000 = 8
                    baseCls + 'tl',     // 1001 = 9
                    baseCls + 'tb',     // 1010 = 10
                    baseCls + 'tbl',    // 1011 = 11
                    baseCls + 'tr',     // 1100 = 12
                    baseCls + 'trl',    // 1101 = 13
                    baseCls + 'trb',    // 1110 = 14
                    baseCls + 'trbl'    // 1111 = 15
                ];
            }

            return table;
        }
    });