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  <pre class="prettyprint lang-js">// Currently has the following issues:
// - Does not handle postEditValue
// - Fields without editors need to sync with their values in Store
// - starting to edit another record while already editing and dirty should probably prevent it
// - aggregating validation messages
// - tabIndex is not managed bc we leave elements in dom, and simply move via positioning
// - layout issues when changing sizes/width while hidden (layout bug)

<span id='Ext-grid-RowEditor'>/**
</span> * Internal utility class used to provide row editing functionality. For developers, they should use
 * the RowEditing plugin to use this functionality with a grid.
 *
 * @private
 */
Ext.define('Ext.grid.RowEditor', {
    extend: 'Ext.form.Panel',
    requires: [
        'Ext.tip.ToolTip',
        'Ext.util.HashMap',
        'Ext.util.KeyNav'
    ],

    //&lt;locale&gt;
    saveBtnText  : 'Update',
    //&lt;/locale&gt;
    //&lt;locale&gt;
    cancelBtnText: 'Cancel',
    //&lt;/locale&gt;
    //&lt;locale&gt;
    errorsText: 'Errors',
    //&lt;/locale&gt;
    //&lt;locale&gt;
    dirtyText: 'You need to commit or cancel your changes',
    //&lt;/locale&gt;

    lastScrollLeft: 0,
    lastScrollTop: 0,

    border: false,
    
    // Change the hideMode to offsets so that we get accurate measurements when
    // the roweditor is hidden for laying out things like a TriggerField.
    hideMode: 'offsets',

    initComponent: function() {
        var me = this,
            form;

        me.cls = Ext.baseCSSPrefix + 'grid-row-editor';

        me.layout = {
            type: 'hbox',
            align: 'middle'
        };

        // Maintain field-to-column mapping
        // It's easy to get a field from a column, but not vice versa
        me.columns = new Ext.util.HashMap();
        me.columns.getKey = function(columnHeader) {
            var f;
            if (columnHeader.getEditor) {
                f = columnHeader.getEditor();
                if (f) {
                    return f.id;
                }
            }
            return columnHeader.id;
        };
        me.mon(me.columns, {
            add: me.onFieldAdd,
            remove: me.onFieldRemove,
            replace: me.onFieldReplace,
            scope: me
        });

        me.callParent(arguments);

        if (me.fields) {
            me.setField(me.fields);
            delete me.fields;
        }
        
        me.mon(Ext.container.Container.hierarchyEventSource, {
            scope: me,
            show: me.repositionIfVisible
        });

        form = me.getForm();
        form.trackResetOnLoad = true;
    },

    onFieldChange: function() {
        var me = this,
            form = me.getForm(),
            valid = form.isValid();
        if (me.errorSummary &amp;&amp; me.isVisible()) {
            me[valid ? 'hideToolTip' : 'showToolTip']();
        }
        me.updateButton(valid);
        me.isValid = valid;
    },
    
    updateButton: function(valid){
        var buttons = this.floatingButtons; 
        if (buttons) {
            buttons.child('#update').setDisabled(!valid);
        }    
    },

    afterRender: function() {
        var me = this,
            plugin = me.editingPlugin;

        me.callParent(arguments);
        me.mon(me.renderTo, 'scroll', me.onCtScroll, me, { buffer: 100 });

        // Prevent from bubbling click events to the grid view
        me.mon(me.el, {
            click: Ext.emptyFn,
            stopPropagation: true
        });

        me.el.swallowEvent([
            'keypress',
            'keydown'
        ]);

        me.keyNav = new Ext.util.KeyNav(me.el, {
            enter: plugin.completeEdit,
            esc: plugin.onEscKey,
            scope: plugin
        });

        me.mon(plugin.view, {
            beforerefresh: me.onBeforeViewRefresh,
            refresh: me.onViewRefresh,
            itemremove: me.onViewItemRemove,
            scope: me
        });
    },

    onBeforeViewRefresh: function(view) {
        var me = this,
            viewDom = view.el.dom;

        if (me.el.dom.parentNode === viewDom) {
            viewDom.removeChild(me.el.dom);
        }
    },

    onViewRefresh: function(view) {
        var me = this,
            viewDom = view.el.dom,
            context = me.context,
            idx;

        viewDom.appendChild(me.el.dom);

        // Recover our row node after a view refresh
        if (context &amp;&amp; (idx = context.store.indexOf(context.record)) &gt;= 0) {
            context.row = view.getNode(idx);
            me.reposition();
            if (me.tooltip &amp;&amp; me.tooltip.isVisible()) {
                me.tooltip.setTarget(context.row);
            }
        } else {
            me.editingPlugin.cancelEdit();
        }
    },

    onViewItemRemove: function(record, index) {
        var context = this.context;
        if (context &amp;&amp; record === context.record) {
            // if the record being edited was removed, cancel editing
            this.editingPlugin.cancelEdit();
        }
    },

    onCtScroll: function(e, target) {
        var me = this,
            scrollTop  = target.scrollTop,
            scrollLeft = target.scrollLeft;

        if (scrollTop !== me.lastScrollTop) {
            me.lastScrollTop = scrollTop;
            if ((me.tooltip &amp;&amp; me.tooltip.isVisible()) || me.hiddenTip) {
                me.repositionTip();
            }
        }
        if (scrollLeft !== me.lastScrollLeft) {
            me.lastScrollLeft = scrollLeft;
            me.reposition();
        }
    },

    onColumnAdd: function(column) {
        if (!column.isGroupHeader) {
            this.setField(column);
        }
    },

    onColumnRemove: function(column) {
        this.columns.remove(column);
    },

    onColumnResize: function(column, width) {
        if (!column.isGroupHeader) {
            column.getEditor().setWidth(width - 2);
            this.repositionIfVisible();
        }
    },

    onColumnHide: function(column) {
        if (!column.isGroupHeader) {
            column.getEditor().hide();
            this.repositionIfVisible();
        }
    },

    onColumnShow: function(column) {
        var field = column.getEditor();
        field.setWidth(column.getWidth() - 2).show();
        this.repositionIfVisible();
    },

    onColumnMove: function(column, fromIdx, toIdx) {
        if (!column.isGroupHeader) {
            var field = column.getEditor();
            if (this.items.indexOf(field) != toIdx) {
                this.move(fromIdx, toIdx);
            }
        }
    },

    onFieldAdd: function(map, fieldId, column) {
        var me = this,
            colIdx,
            field;

        if (!column.isGroupHeader) {
            colIdx = me.editingPlugin.grid.headerCt.getHeaderIndex(column);
            field = column.getEditor({ xtype: 'displayfield' });
            me.insert(colIdx, field);
        }
    },

    onFieldRemove: function(map, fieldId, column) {
        var me = this,
            field,
            fieldEl;

        if (!column.isGroupHeader) {
            field = column.getEditor();
            fieldEl = field.el;
            me.remove(field, false);
            if (fieldEl) {
                fieldEl.remove();
            }
        }
    },

    onFieldReplace: function(map, fieldId, column, oldColumn) {
        this.onFieldRemove(map, fieldId, oldColumn);
    },

    clearFields: function() {
        var map = this.columns,
            key;

        for (key in map) {
            if (map.hasOwnProperty(key)) {
                map.removeAtKey(key);
            }
        }
    },

    getFloatingButtons: function() {
        var me = this,
            cssPrefix = Ext.baseCSSPrefix,
            btnsCss = cssPrefix + 'grid-row-editor-buttons',
            plugin = me.editingPlugin,
            minWidth = Ext.panel.Panel.prototype.minButtonWidth,
            btns;

        if (!me.floatingButtons) {
            btns = me.floatingButtons = new Ext.Container({
                renderTpl: [
                    '&lt;div class=&quot;{baseCls}-ml&quot;&gt;&lt;/div&gt;',
                    '&lt;div class=&quot;{baseCls}-mr&quot;&gt;&lt;/div&gt;',
                    '&lt;div class=&quot;{baseCls}-bl&quot;&gt;&lt;/div&gt;',
                    '&lt;div class=&quot;{baseCls}-br&quot;&gt;&lt;/div&gt;',
                    '&lt;div class=&quot;{baseCls}-bc&quot;&gt;&lt;/div&gt;',
                    '{%this.renderContainer(out,values)%}'
                ],
                width: 200,
                renderTo: me.el,
                baseCls: btnsCss,
                layout: {
                    type: 'hbox',
                    align: 'middle'
                },
                defaults: {
                    flex: 1,
                    margins: '0 1 0 1'
                },
                items: [{
                    itemId: 'update',
                    xtype: 'button',
                    handler: plugin.completeEdit,
                    scope: plugin,
                    text: me.saveBtnText,
                    minWidth: minWidth
                }, {
                    xtype: 'button',
                    handler: plugin.cancelEdit,
                    scope: plugin,
                    text: me.cancelBtnText,
                    minWidth: minWidth
                }]
            });

            // Prevent from bubbling click events to the grid view
            me.mon(btns.el, {
                // BrowserBug: Opera 11.01
                //   causes the view to scroll when a button is focused from mousedown
                mousedown: Ext.emptyFn,
                click: Ext.emptyFn,
                stopEvent: true
            });
        }
        return me.floatingButtons;
    },
    
    repositionIfVisible: function(c){
        var me = this,
            view = me.view;
        
        // If we're showing ourselves, jump out
        // If the component we're showing doesn't contain the view
        if (c &amp;&amp; (c == me || !view.isDescendantOf(c))) {
            return;
        }
        
        if (me.isVisible() &amp;&amp; view.isVisible(true)) {
            me.reposition();    
        }
    },

    reposition: function(animateConfig) {
        var me = this,
            context = me.context,
            row = context &amp;&amp; Ext.get(context.row),
            btns = me.getFloatingButtons(),
            btnEl = btns.el,
            grid = me.editingPlugin.grid,
            viewEl = grid.view.el,

            // always get data from ColumnModel as its what drives
            // the GridView's sizing
            mainBodyWidth = grid.headerCt.getFullWidth(),
            scrollerWidth = grid.getWidth(),

            // use the minimum as the columns may not fill up the entire grid
            // width
            width = Math.min(mainBodyWidth, scrollerWidth),
            scrollLeft = grid.view.el.dom.scrollLeft,
            btnWidth = btns.getWidth(),
            left = (width - btnWidth) / 2 + scrollLeft,
            y, rowH, newHeight,

            invalidateScroller = function() {
                btnEl.scrollIntoView(viewEl, false);
                if (animateConfig &amp;&amp; animateConfig.callback) {
                    animateConfig.callback.call(animateConfig.scope || me);
                }
            },
            
            animObj;

        // need to set both top/left
        if (row &amp;&amp; Ext.isElement(row.dom)) {
            // Bring our row into view if necessary, so a row editor that's already
            // visible and animated to the row will appear smooth
            row.scrollIntoView(viewEl, false);

            // Get the y position of the row relative to its top-most static parent.
            // offsetTop will be relative to the table, and is incorrect
            // when mixed with certain grid features (e.g., grouping).
            y = row.getXY()[1] - 5;
            rowH = row.getHeight();
            newHeight = rowH + (me.editingPlugin.grid.rowLines ? 9 : 10);

            // Set editor height to match the row height
            if (me.getHeight() != newHeight) {
                me.setHeight(newHeight);
                me.el.setLeft(0);
            }

            if (animateConfig) {
                animObj = {
                    to: {
                        y: y
                    },
                    duration: animateConfig.duration || 125,
                    listeners: {
                        afteranimate: function() {
                            invalidateScroller();
                            y = row.getXY()[1] - 5;
                        }
                    }
                };
                me.el.animate(animObj);
            } else {
                me.el.setY(y);
                invalidateScroller();
            }
        }
        if (me.getWidth() != mainBodyWidth) {
            me.setWidth(mainBodyWidth);
        }
        btnEl.setLeft(left);
    },

    getEditor: function(fieldInfo) {
        var me = this;

        if (Ext.isNumber(fieldInfo)) {
            // Query only form fields. This just future-proofs us in case we add
            // other components to RowEditor later on.  Don't want to mess with
            // indices.
            return me.query('&gt;[isFormField]')[fieldInfo];
        } else if (fieldInfo.isHeader &amp;&amp; !fieldInfo.isGroupHeader) {
            return fieldInfo.getEditor();
        }
    },

    removeField: function(field) {
        var me = this;

        // Incase we pass a column instead, which is fine
        field = me.getEditor(field);
        me.mun(field, 'validitychange', me.onValidityChange, me);

        // Remove field/column from our mapping, which will fire the event to
        // remove the field from our container
        me.columns.removeAtKey(field.id);
        Ext.destroy(field);
    },

    setField: function(column) {
        var me = this,
            i,
            length, field;

        if (Ext.isArray(column)) {
            length = column.length;

            for (i = 0; i &lt; length; i++) {
                me.setField(column[i]);
            }

            return;
        }

        // Get a default display field if necessary
        field = column.getEditor(null, {
            xtype: 'displayfield',
            // Override Field's implementation so that the default display fields will not return values. This is done because
            // the display field will pick up column renderers from the grid.
            getModelData: function() {
                return null;
            }
        });
        field.margins = '0 0 0 2';
        me.mon(field, 'change', me.onFieldChange, me);
        
        if (me.isVisible() &amp;&amp; me.context) {
            if (field.is('displayfield')) {
                me.renderColumnData(field, me.context.record, column);
            } else {
                field.suspendEvents();
                field.setValue(me.context.record.get(column.dataIndex));
                field.resumeEvents();
            }
        }

        // Maintain mapping of fields-to-columns
        // This will fire events that maintain our container items
        
        me.columns.add(field.id, column);
        if (column.hidden) {
            me.onColumnHide(column);
        } else if (column.rendered) {
            // Setting after initial render
            me.onColumnShow(column);
        }
    },

    loadRecord: function(record) {
        var me     = this,
            form   = me.getForm(),
            fields = form.getFields(),
            items  = fields.items,
            length = items.length,
            i, displayFields,
            isValid;
            
        // temporarily suspend events on form fields before loading record to prevent the fields' change events from firing
        for (i = 0; i &lt; length; i++) {
            items[i].suspendEvents();
        }

        form.loadRecord(record);

        for (i = 0; i &lt; length; i++) {
            items[i].resumeEvents();
        }

        isValid = form.isValid();
        if (me.errorSummary) {
            if (isValid) {
                me.hideToolTip();
            } else {
                me.showToolTip();
            }
        }
        
        me.updateButton(isValid);

        // render display fields so they honor the column renderer/template
        displayFields = me.query('&gt;displayfield');
        length = displayFields.length;

        for (i = 0; i &lt; length; i++) {
            me.renderColumnData(displayFields[i], record);
        }
    },

    renderColumnData: function(field, record, activeColumn) {
        var me = this,
            grid = me.editingPlugin.grid,
            headerCt = grid.headerCt,
            view = grid.view,
            store = view.store,
            column = activeColumn || me.columns.get(field.id),
            value = record.get(column.dataIndex),
            renderer = column.editRenderer || column.renderer,
            metaData,
            rowIdx,
            colIdx;

        // honor our column's renderer (TemplateHeader sets renderer for us!)
        if (renderer) {
            metaData = { tdCls: '', style: '' };
            rowIdx = store.indexOf(record);
            colIdx = headerCt.getHeaderIndex(column);

            value = renderer.call(
                column.scope || headerCt.ownerCt,
                value,
                metaData,
                record,
                rowIdx,
                colIdx,
                store,
                view
            );
        }

        field.setRawValue(value);
        field.resetOriginalValue();
    },

    beforeEdit: function() {
        var me = this;

        if (me.isVisible() &amp;&amp; me.errorSummary &amp;&amp; !me.autoCancel &amp;&amp; me.isDirty()) {
            me.showToolTip();
            return false;
        }
    },

<span id='Ext-grid-RowEditor-method-startEdit'>    /**
</span>     * Start editing the specified grid at the specified position.
     * @param {Ext.data.Model} record The Store data record which backs the row to be edited.
     * @param {Ext.data.Model} columnHeader The Column object defining the column to be edited.
     */
    startEdit: function(record, columnHeader) {
        var me = this,
            grid = me.editingPlugin.grid,
            store = grid.store,
            context = me.context = Ext.apply(me.editingPlugin.context, {
                view: grid.getView(),
                store: store
            });

        // make sure our row is selected before editing
        context.grid.getSelectionModel().select(record);

        // Reload the record data
        me.loadRecord(record);

        if (!me.isVisible()) {
            me.show();
            me.focusContextCell();
        } else {
            me.reposition({
                callback: this.focusContextCell
            });
        }
    },

    // Focus the cell on start edit based upon the current context
    focusContextCell: function() {
        var field = this.getEditor(this.context.colIdx);
        if (field &amp;&amp; field.focus) {
            field.focus();
        }
    },

    cancelEdit: function() {
        var me     = this,
            form   = me.getForm(),
            fields = form.getFields(),
            items  = fields.items,
            length = items.length,
            i;

        me.hide();
        form.clearInvalid();

        // temporarily suspend events on form fields before reseting the form to prevent the fields' change events from firing
        for (i = 0; i &lt; length; i++) {
            items[i].suspendEvents();
        }

        form.reset();

        for (i = 0; i &lt; length; i++) {
            items[i].resumeEvents();
        }
    },

    completeEdit: function() {
        var me = this,
            form = me.getForm();

        if (!form.isValid()) {
            return;
        }

        form.updateRecord(me.context.record);
        me.hide();
        return true;
    },

    onShow: function() {
        this.callParent(arguments);
        this.reposition();
    },

    onHide: function() {
        var me = this;
        me.callParent(arguments);
        if (me.tooltip) {
            me.hideToolTip();
        }
        if (me.context) {
            me.context.view.focus();
            me.context = null;
        }
    },

    isDirty: function() {
        var me = this,
            form = me.getForm();
        return form.isDirty();
    },

    getToolTip: function() {
        return this.tooltip || (this.tooltip = new Ext.tip.ToolTip({
            cls: Ext.baseCSSPrefix + 'grid-row-editor-errors',
            title: this.errorsText,
            autoHide: false,
            closable: true,
            closeAction: 'disable',
            anchor: 'left'
        }));
    },

    hideToolTip: function() {
        var me = this,
            tip = me.getToolTip();
        if (tip.rendered) {
            tip.disable();
        }
        me.hiddenTip = false;
    },

    showToolTip: function() {
        var me = this,
            tip = me.getToolTip(),
            context = me.context,
            row = Ext.get(context.row),
            viewEl = context.grid.view.el;

        tip.setTarget(row);
        tip.showAt([-10000, -10000]);
        tip.update(me.getErrors());
        tip.mouseOffset = [viewEl.getWidth() - row.getWidth() + me.lastScrollLeft + 15, 0];
        me.repositionTip();
        tip.doLayout();
        tip.enable();
    },

    repositionTip: function() {
        var me = this,
            tip = me.getToolTip(),
            context = me.context,
            row = Ext.get(context.row),
            viewEl = context.grid.view.el,
            viewHeight = viewEl.getHeight(),
            viewTop = me.lastScrollTop,
            viewBottom = viewTop + viewHeight,
            rowHeight = row.getHeight(),
            rowTop = row.dom.offsetTop,
            rowBottom = rowTop + rowHeight;

        if (rowBottom &gt; viewTop &amp;&amp; rowTop &lt; viewBottom) {
            tip.show();
            me.hiddenTip = false;
        } else {
            tip.hide();
            me.hiddenTip = true;
        }
    },

    getErrors: function() {
        var me        = this,
            dirtyText = !me.autoCancel &amp;&amp; me.isDirty() ? me.dirtyText + '&lt;br /&gt;' : '',
            errors    = [],
            fields    = me.query('&gt;[isFormField]'),
            length    = fields.length,
            i;

        function createListItem(e) {
            return '&lt;li&gt;' + e + '&lt;/li&gt;';
        }

        for (i = 0; i &lt; length; i++) {
            errors = errors.concat(
                Ext.Array.map(fields[i].getErrors(), createListItem)
            );
        }

        return dirtyText + '&lt;ul&gt;' + errors.join('') + '&lt;/ul&gt;';
    },
    
    beforeDestroy: function(){
        Ext.destroy(this.floatingButtons, this.tooltip);
        this.callParent();    
    }
});</pre>
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