The source code

    Ext.ns('Ext.ux.grid');

    /**
     * @class Ext.ux.grid.RowEditor
     * @extends Ext.Panel
     * Plugin (ptype = 'roweditor') that adds the ability to rapidly edit full rows in a grid.
     * A validation mode may be enabled which uses AnchorTips to notify the user of all
     * validation errors at once.
     *
     * @ptype roweditor
     */
    Ext.ux.grid.RowEditor = Ext.extend(Ext.Panel, {
        floating: true,
        shadow: false,
        layout: 'hbox',
        cls: 'x-small-editor',
        buttonAlign: 'center',
        baseCls: 'x-row-editor',
        elements: 'header,footer,body',
        frameWidth: 5,
        buttonPad: 3,
        clicksToEdit: 'auto',
        monitorValid: true,
        focusDelay: 250,
        errorSummary: true,

        defaults: {
            normalWidth: true
        },

        initComponent: function(){
            Ext.ux.grid.RowEditor.superclass.initComponent.call(this);
            this.addEvents(
                /**
                 * @event beforeedit
                 * Fired before the row editor is activated.
                 * If the listener returns false the editor will not be activated.
                 * @param {Ext.ux.grid.RowEditor} roweditor This object
                 * @param {Number} rowIndex The rowIndex of the row just edited
                 */
                'beforeedit',
                /**
                 * @event validateedit
                 * Fired after a row is edited and passes validation.
                 * If the listener returns false changes to the record will not be set.
                 * @param {Ext.ux.grid.RowEditor} roweditor This object
                 * @param {Object} changes Object with changes made to the record.
                 * @param {Ext.data.Record} r The Record that was edited.
                 * @param {Number} rowIndex The rowIndex of the row just edited
                 */
                'validateedit',
                /**
                 * @event afteredit
                 * Fired after a row is edited and passes validation.  This event is fired
                 * after the store's update event is fired with this edit.
                 * @param {Ext.ux.grid.RowEditor} roweditor This object
                 * @param {Object} changes Object with changes made to the record.
                 * @param {Ext.data.Record} r The Record that was edited.
                 * @param {Number} rowIndex The rowIndex of the row just edited
                 */
                'afteredit'
            );
        },

        init: function(grid){
            this.grid = grid;
            this.ownerCt = grid;
            if(this.clicksToEdit === 2){
                grid.on('rowdblclick', this.onRowDblClick, this);
            }else{
                grid.on('rowclick', this.onRowClick, this);
                if(Ext.isIE){
                    grid.on('rowdblclick', this.onRowDblClick, this);
                }
            }

            // stopEditing without saving when a record is removed from Store.
            grid.getStore().on('remove', function() {
                this.stopEditing(false);
            },this);

            grid.on({
                scope: this,
                keydown: this.onGridKey,
                columnresize: this.verifyLayout,
                columnmove: this.refreshFields,
                reconfigure: this.refreshFields,
    	    destroy : this.destroy,
                bodyscroll: {
                    buffer: 250,
                    fn: this.positionButtons
                }
            });
            grid.getColumnModel().on('hiddenchange', this.verifyLayout, this, {delay:1});
            grid.getView().on('refresh', this.stopEditing.createDelegate(this, []));
        },

        refreshFields: function(){
            this.initFields();
            this.verifyLayout();
        },

        isDirty: function(){
            var dirty;
            this.items.each(function(f){
                if(String(this.values[f.id]) !== String(f.getValue())){
                    dirty = true;
                    return false;
                }
            }, this);
            return dirty;
        },

        startEditing: function(rowIndex, doFocus){
            if(this.editing && this.isDirty()){
                this.showTooltip('You need to commit or cancel your changes');
                return;
            }
            this.editing = true;
            if(typeof rowIndex == 'object'){
                rowIndex = this.grid.getStore().indexOf(rowIndex);
            }
            if(this.fireEvent('beforeedit', this, rowIndex) !== false){
                var g = this.grid, view = g.getView();
                var row = view.getRow(rowIndex);
                var record = g.store.getAt(rowIndex);
                this.record = record;
                this.rowIndex = rowIndex;
                this.values = {};
                if(!this.rendered){
                    this.render(view.getEditorParent());
                }
                var w = Ext.fly(row).getWidth();
                this.setSize(w);
                if(!this.initialized){
                    this.initFields();
                }
                var cm = g.getColumnModel(), fields = this.items.items, f, val;
                for(var i = 0, len = cm.getColumnCount(); i < len; i++){
                    val = this.preEditValue(record, cm.getDataIndex(i));
                    f = fields[i];
                    f.setValue(val);
                    this.values[f.id] = val || '';
                }
                this.verifyLayout(true);
                if(!this.isVisible()){
                    this.setPagePosition(Ext.fly(row).getXY());
                } else{
                    this.el.setXY(Ext.fly(row).getXY(), {duration:0.15});
                }
                if(!this.isVisible()){
                    this.show().doLayout();
                }
                if(doFocus !== false){
                    this.doFocus.defer(this.focusDelay, this);
                }
            }
        },

        stopEditing : function(saveChanges){
            this.editing = false;
            if(!this.isVisible()){
                return;
            }
            if(saveChanges === false || !this.isValid()){
                this.hide();
                return;
            }
            var changes = {}, r = this.record, hasChange = false;
            var cm = this.grid.colModel, fields = this.items.items;
            for(var i = 0, len = cm.getColumnCount(); i < len; i++){
                if(!cm.isHidden(i)){
                    var dindex = cm.getDataIndex(i);
                    if(!Ext.isEmpty(dindex)){
                        var oldValue = r.data[dindex];
                        var value = this.postEditValue(fields[i].getValue(), oldValue, r, dindex);
                        if(String(oldValue) !== String(value)){
                            changes[dindex] = value;
                            hasChange = true;
                        }
                    }
                }
            }
            if(hasChange && this.fireEvent('validateedit', this, changes, r, this.rowIndex) !== false){
                r.beginEdit();
                for(var k in changes){
                    if(changes.hasOwnProperty(k)){
                        r.set(k, changes[k]);
                    }
                }
                r.endEdit();
                this.fireEvent('afteredit', this, changes, r, this.rowIndex);
            }
            this.hide();
        },

        verifyLayout: function(force){
            if(this.el && (this.isVisible() || force === true)){
                var row = this.grid.getView().getRow(this.rowIndex);
                this.setSize(Ext.fly(row).getWidth(), Ext.isIE ? Ext.fly(row).getHeight() + (Ext.isBorderBox ? 9 : 0) : undefined);
                var cm = this.grid.colModel, fields = this.items.items;
                for(var i = 0, len = cm.getColumnCount(); i < len; i++){
                    if(!cm.isHidden(i)){
                        var adjust = 0;
                        if(i === 0){
                            adjust += 0; // outer padding
                        }
                        if(i === (len - 1)){
                            adjust += 3; // outer padding
                        } else{
                            adjust += 1;
                        }
                        fields[i].show();
                        fields[i].setWidth(cm.getColumnWidth(i) - adjust);
                    } else{
                        fields[i].hide();
                    }
                }
                this.doLayout();
                this.positionButtons();
            }
        },

        slideHide : function(){
            this.hide();
        },

        initFields: function(){
            var cm = this.grid.getColumnModel(), pm = Ext.layout.ContainerLayout.prototype.parseMargins;
            this.removeAll(false);
            for(var i = 0, len = cm.getColumnCount(); i < len; i++){
                var c = cm.getColumnAt(i);
                var ed = c.getEditor();
                if(!ed){
                    ed = c.displayEditor || new Ext.form.DisplayField();
                }
                if(i == 0){
                    ed.margins = pm('0 1 2 1');
                } else if(i == len - 1){
                    ed.margins = pm('0 0 2 1');
                } else{
                    ed.margins = pm('0 1 2');
                }
                ed.setWidth(cm.getColumnWidth(i));
                ed.column = c;
                if(ed.ownerCt !== this){
                    ed.on('focus', this.ensureVisible, this);
                    ed.on('specialkey', this.onKey, this);
                }
                this.insert(i, ed);
            }
            this.initialized = true;
        },

        onKey: function(f, e){
            if(e.getKey() === e.ENTER){
                this.stopEditing(true);
                e.stopPropagation();
            }
        },

        onGridKey: function(e){
            if(e.getKey() === e.ENTER && !this.isVisible()){
                var r = this.grid.getSelectionModel().getSelected();
                if(r){
                    var index = this.grid.store.indexOf(r);
                    this.startEditing(index);
                    e.stopPropagation();
                }
            }
        },

        ensureVisible: function(editor){
            if(this.isVisible()){
                 this.grid.getView().ensureVisible(this.rowIndex, this.grid.colModel.getIndexById(editor.column.id), true);
            }
        },

        onRowClick: function(g, rowIndex, e){
            if(this.clicksToEdit == 'auto'){
                var li = this.lastClickIndex;
                this.lastClickIndex = rowIndex;
                if(li != rowIndex && !this.isVisible()){
                    return;
                }
            }
            this.startEditing(rowIndex, false);
            this.doFocus.defer(this.focusDelay, this, [e.getPoint()]);
        },

        onRowDblClick: function(g, rowIndex, e){
            this.startEditing(rowIndex, false);
            this.doFocus.defer(this.focusDelay, this, [e.getPoint()]);
        },

        onRender: function(){
            Ext.ux.grid.RowEditor.superclass.onRender.apply(this, arguments);
            this.el.swallowEvent(['keydown', 'keyup', 'keypress']);
            this.btns = new Ext.Panel({
                baseCls: 'x-plain',
                cls: 'x-btns',
                elements:'body',
                layout: 'table',
                width: (this.minButtonWidth * 2) + (this.frameWidth * 2) + (this.buttonPad * 4), // width must be specified for IE
                items: [{
                    ref: 'saveBtn',
                    itemId: 'saveBtn',
                    xtype: 'button',
                    text: this.saveText || 'Save',
                    width: this.minButtonWidth,
                    handler: this.stopEditing.createDelegate(this, [true])
                }, {
                    xtype: 'button',
                    text: this.cancelText || 'Cancel',
                    width: this.minButtonWidth,
                    handler: this.stopEditing.createDelegate(this, [false])
                }]
            });
            this.btns.render(this.bwrap);
        },

        afterRender: function(){
            Ext.ux.grid.RowEditor.superclass.afterRender.apply(this, arguments);
            this.positionButtons();
            if(this.monitorValid){
                this.startMonitoring();
            }
        },

        onShow: function(){
            if(this.monitorValid){
                this.startMonitoring();
            }
            Ext.ux.grid.RowEditor.superclass.onShow.apply(this, arguments);
        },

        onHide: function(){
            Ext.ux.grid.RowEditor.superclass.onHide.apply(this, arguments);
            this.stopMonitoring();
            this.grid.getView().focusRow(this.rowIndex);
        },

        positionButtons: function(){
            if(this.btns){
                var h = this.el.dom.clientHeight;
                var view = this.grid.getView();
                var scroll = view.scroller.dom.scrollLeft;
                var width =  view.mainBody.getWidth();
                var bw = this.btns.getWidth();
                this.btns.el.shift({left: (width/2)-(bw/2)+scroll, top: h - 2, stopFx: true, duration:0.2});
            }
        },

        // private
        preEditValue : function(r, field){
            var value = r.data[field];
            return this.autoEncode && typeof value === 'string' ? Ext.util.Format.htmlDecode(value) : value;
        },

        // private
        postEditValue : function(value, originalValue, r, field){
            return this.autoEncode && typeof value == 'string' ? Ext.util.Format.htmlEncode(value) : value;
        },

        doFocus: function(pt){
            if(this.isVisible()){
                var index = 0;
                if(pt){
                    index = this.getTargetColumnIndex(pt);
                }
                var cm = this.grid.getColumnModel();
                for(var i = index||0, len = cm.getColumnCount(); i < len; i++){
                    var c = cm.getColumnAt(i);
                    if(!c.hidden && c.getEditor()){
                        c.getEditor().focus();
                        break;
                    }
                }
            }
        },

        getTargetColumnIndex: function(pt){
            var grid = this.grid, v = grid.view;
            var x = pt.left;
            var cms = grid.colModel.config;
            var i = 0, match = false;
            for(var len = cms.length, c; c = cms[i]; i++){
                if(!c.hidden){
                    if(Ext.fly(v.getHeaderCell(i)).getRegion().right >= x){
                        match = i;
                        break;
                    }
                }
            }
            return match;
        },

        startMonitoring : function(){
            if(!this.bound && this.monitorValid){
                this.bound = true;
                Ext.TaskMgr.start({
                    run : this.bindHandler,
                    interval : this.monitorPoll || 200,
                    scope: this
                });
            }
        },

        stopMonitoring : function(){
            this.bound = false;
            if(this.tooltip){
                this.tooltip.hide();
            }
        },

        isValid: function(){
            var valid = true;
            this.items.each(function(f){
                if(!f.isValid(true)){
                    valid = false;
                    return false;
                }
            });
            return valid;
        },

        // private
        bindHandler : function(){
            if(!this.bound){
                return false; // stops binding
            }
            var valid = this.isValid();
            if(!valid && this.errorSummary){
                this.showTooltip(this.getErrorText().join(''));
            }
            this.btns.saveBtn.setDisabled(!valid);
            this.fireEvent('validation', this, valid);
        },

        showTooltip: function(msg){
            var t = this.tooltip;
            if(!t){
                t = this.tooltip = new Ext.ToolTip({
                    maxWidth: 600,
                    cls: 'errorTip',
                    width: 300,
                    title: 'Errors',
                    autoHide: false,
                    anchor: 'left',
                    anchorToTarget: true,
                    mouseOffset: [40,0]
                });
            }
            t.initTarget(this.items.last().getEl());
            if(!t.rendered){
                t.show();
                t.hide();
            }
            t.body.update(msg);
            t.doAutoWidth();
            t.show();
        },

        getErrorText: function(){
            var data = [''];
            this.items.each(function(f){
                if(!f.isValid(true)){
                    data.push('', f.activeError, '');
                }
            });
            data.push('');
            return data;
        }
    });
    Ext.preg('roweditor', Ext.ux.grid.RowEditor);

    Ext.override(Ext.form.Field, {
        markInvalid : function(msg){
            if(!this.rendered || this.preventMark){ // not rendered
                return;
            }
            msg = msg || this.invalidText;

            var mt = this.getMessageHandler();
            if(mt){
                mt.mark(this, msg);
            }else if(this.msgTarget){
                this.el.addClass(this.invalidClass);
                var t = Ext.getDom(this.msgTarget);
                if(t){
                    t.innerHTML = msg;
                    t.style.display = this.msgDisplay;
                }
            }
            this.activeError = msg;
            this.fireEvent('invalid', this, msg);
        }
    });

    Ext.override(Ext.ToolTip, {
        doAutoWidth : function(){
            var bw = this.body.getTextWidth();
            if(this.title){
                bw = Math.max(bw, this.header.child('span').getTextWidth(this.title));
            }
            bw += this.getFrameWidth() + (this.closable ? 20 : 0) + this.body.getPadding("lr") + 20;
            this.setWidth(bw.constrain(this.minWidth, this.maxWidth));

            // IE7 repaint bug on initial show
            if(Ext.isIE7 && !this.repainted){
                this.el.repaint();
                this.repainted = true;
            }
        }
    });