gridview.js

Ext JS是一个创建丰富互联网应用程序的跨浏览器的JavaScrip库。它包含：高效率

 * @param {Number} row The row index in which to find the cell.
 * @param {Number} col The column index of the cell.
 * @return {HtmlElement} The <TD> at the specified coordinates.
 */
    getCell : function(row, col){
        return this.getRow(row).getElementsByTagName('td')[col];
    },

/**
 * Return the <TD> HtmlElement which represents the Grid's header cell for the specified column index.
 * @param {Number} index The column index
 * @return {HtmlElement} The <TD> element.
 */
    getHeaderCell : function(index){
      return this.mainHd.dom.getElementsByTagName('td')[index];
    },

    // manipulating elements

    // private - use getRowClass to apply custom row classes
    addRowClass : function(row, cls){
        var r = this.getRow(row);
        if(r){
            this.fly(r).addClass(cls);
        }
    },

    // private
    removeRowClass : function(row, cls){
        var r = this.getRow(row);
        if(r){
            this.fly(r).removeClass(cls);
        }
    },

    // private
    removeRow : function(row){
        Ext.removeNode(this.getRow(row));
        this.syncFocusEl(row);
    },
    
    // private
    removeRows : function(firstRow, lastRow){
        var bd = this.mainBody.dom;
        for(var rowIndex = firstRow; rowIndex <= lastRow; rowIndex++){
            Ext.removeNode(bd.childNodes[firstRow]);
        }
        this.syncFocusEl(firstRow);
    },

    // scrolling stuff

    // private
    getScrollState : function(){
        var sb = this.scroller.dom;
        return {left: sb.scrollLeft, top: sb.scrollTop};
    },

    // private
    restoreScroll : function(state){
        var sb = this.scroller.dom;
        sb.scrollLeft = state.left;
        sb.scrollTop = state.top;
    },

    /**
     * Scrolls the grid to the top
     */
    scrollToTop : function(){
        this.scroller.dom.scrollTop = 0;
        this.scroller.dom.scrollLeft = 0;
    },

    // private
    syncScroll : function(){
      this.syncHeaderScroll();
      var mb = this.scroller.dom;
        this.grid.fireEvent("bodyscroll", mb.scrollLeft, mb.scrollTop);
    },

    // private
    syncHeaderScroll : function(){
        var mb = this.scroller.dom;
        this.innerHd.scrollLeft = mb.scrollLeft;
        this.innerHd.scrollLeft = mb.scrollLeft; // second time for IE (1/2 time first fails, other browsers ignore)
    },

    // private
    updateSortIcon : function(col, dir){
        var sc = this.sortClasses;
        var hds = this.mainHd.select('td').removeClass(sc);
        hds.item(col).addClass(sc[dir == "DESC" ? 1 : 0]);
    },

    // private
    updateAllColumnWidths : function(){
        var tw = this.getTotalWidth();
        var clen = this.cm.getColumnCount();
        var ws = [];
        for(var i = 0; i < clen; i++){
            ws[i] = this.getColumnWidth(i);
        }
        this.innerHd.firstChild.style.width = this.getOffsetWidth();
        this.innerHd.firstChild.firstChild.style.width = tw;
        this.mainBody.dom.style.width = tw;
        for(var i = 0; i < clen; i++){
            var hd = this.getHeaderCell(i);
            hd.style.width = ws[i];
        }

        var ns = this.getRows(), row, trow;
        for(var i = 0, len = ns.length; i < len; i++){
            row = ns[i];
            row.style.width = tw;
            if(row.firstChild){
                row.firstChild.style.width = tw;
                trow = row.firstChild.rows[0];
                for (var j = 0; j < clen; j++) {
                   trow.childNodes[j].style.width = ws[j];
                }
            }
        }

        this.onAllColumnWidthsUpdated(ws, tw);
    },

    // private
    updateColumnWidth : function(col, width){
        var w = this.getColumnWidth(col);
        var tw = this.getTotalWidth();
        this.innerHd.firstChild.style.width = this.getOffsetWidth();
        this.innerHd.firstChild.firstChild.style.width = tw;
        this.mainBody.dom.style.width = tw;
        var hd = this.getHeaderCell(col);
        hd.style.width = w;

        var ns = this.getRows(), row;
        for(var i = 0, len = ns.length; i < len; i++){
            row = ns[i];
            row.style.width = tw;
            if(row.firstChild){
                row.firstChild.style.width = tw;
                row.firstChild.rows[0].childNodes[col].style.width = w;
            }
        }

        this.onColumnWidthUpdated(col, w, tw);
    },

    // private
    updateColumnHidden : function(col, hidden){
        var tw = this.getTotalWidth();
        this.innerHd.firstChild.style.width = this.getOffsetWidth();
        this.innerHd.firstChild.firstChild.style.width = tw;
        this.mainBody.dom.style.width = tw;
        var display = hidden ? 'none' : '';

        var hd = this.getHeaderCell(col);
        hd.style.display = display;

        var ns = this.getRows(), row;
        for(var i = 0, len = ns.length; i < len; i++){
            row = ns[i];
            row.style.width = tw;
            if(row.firstChild){
                row.firstChild.style.width = tw;
                row.firstChild.rows[0].childNodes[col].style.display = display;
            }
        }

        this.onColumnHiddenUpdated(col, hidden, tw);
        delete this.lastViewWidth; // force recalc
        this.layout();
    },

    // private
    doRender : function(cs, rs, ds, startRow, colCount, stripe){
        var ts = this.templates, ct = ts.cell, rt = ts.row, last = colCount-1;
        var tstyle = 'width:'+this.getTotalWidth()+';';
        // buffers
        var buf = [], cb, c, p = {}, rp = {tstyle: tstyle}, r;
        for(var j = 0, len = rs.length; j < len; j++){
            r = rs[j]; cb = [];
            var rowIndex = (j+startRow);
            for(var i = 0; i < colCount; i++){
                c = cs[i];
                p.id = c.id;
                p.css = i == 0 ? 'x-grid3-cell-first ' : (i == last ? 'x-grid3-cell-last ' : '');
                p.attr = p.cellAttr = "";
                p.value = c.renderer(r.data[c.name], p, r, rowIndex, i, ds);
                p.style = c.style;
                if(p.value == undefined || p.value === "") p.value = "&#160;";
                if(this.markDirty && r.dirty && typeof r.modified[c.name] !== 'undefined'){
                    p.css += ' x-grid3-dirty-cell';
                }
                cb[cb.length] = ct.apply(p);
            }
            var alt = [];
            if(stripe && ((rowIndex+1) % 2 == 0)){
                alt[0] = "x-grid3-row-alt";
            }
            if(r.dirty){
                alt[1] = " x-grid3-dirty-row";
            }
            rp.cols = colCount;
            if(this.getRowClass){
                alt[2] = this.getRowClass(r, rowIndex, rp, ds);
            }
            rp.alt = alt.join(" ");
            rp.cells = cb.join("");
            buf[buf.length] =  rt.apply(rp);
        }
        return buf.join("");
    },

    // private
    processRows : function(startRow, skipStripe){
        if(!this.ds || this.ds.getCount() < 1){
            return;
        }
        skipStripe = skipStripe || !this.grid.stripeRows;
        startRow = startRow || 0;
        var rows = this.getRows();
        var cls = ' x-grid3-row-alt ';
        rows[0].className += ' x-grid3-row-first';
        rows[rows.length - 1].className += ' x-grid3-row-last';
        for(var i = startRow, len = rows.length; i < len; i++){
            var row = rows[i];
            row.rowIndex = i;
            if(!skipStripe){
                var isAlt = ((i+1) % 2 == 0);
                var hasAlt = (' '+row.className + ' ').indexOf(cls) != -1;
                if(isAlt == hasAlt){
                    continue;
                }
                if(isAlt){
                    row.className += " x-grid3-row-alt";
                }else{
                    row.className = row.className.replace("x-grid3-row-alt", "");
                }
            }
        }
    },

    afterRender : function(){
        if(!this.ds || !this.cm){
            return;
        }
        this.mainBody.dom.innerHTML = this.renderRows() || '&nbsp;';
        this.processRows(0, true);

        if(this.deferEmptyText !== true){
            this.applyEmptyText();
        }
    },

    // private
    renderUI : function(){

        var header = this.renderHeaders();
        var body = this.templates.body.apply({rows:'&nbsp;'});


        var html = this.templates.master.apply({
            body: body,
            header: header,
            ostyle: 'width:'+this.getOffsetWidth()+';',
            bstyle: 'width:'+this.getTotalWidth()+';'
        });

        var g = this.grid;

        g.getGridEl().dom.innerHTML = html;

        this.initElements();

        // get mousedowns early
        Ext.fly(this.innerHd).on("click", this.handleHdDown, this);
        this.mainHd.on("mouseover", this.handleHdOver, this);
        this.mainHd.on("mouseout", this.handleHdOut, this);
        this.mainHd.on("mousemove", this.handleHdMove, this);

        this.scroller.on('scroll', this.syncScroll,  this);
        if(g.enableColumnResize !== false){
            this.splitZone = new Ext.grid.GridView.SplitDragZone(g, this.mainHd.dom);
        }

        if(g.enableColumnMove){
            this.columnDrag = new Ext.grid.GridView.ColumnDragZone(g, this.innerHd);
            this.columnDrop = new Ext.grid.HeaderDropZone(g, this.mainHd.dom);
        }

        if(g.enableHdMenu !== false){
            this.hmenu = new Ext.menu.Menu({id: g.id + "-hctx"});
            this.hmenu.add(
                {itemId:"asc", text: this.sortAscText, cls: "xg-hmenu-sort-asc"},
                {itemId:"desc", text: this.sortDescText, cls: "xg-hmenu-sort-desc"}
            );
            if(g.enableColumnHide !== false){
                this.colMenu = new Ext.menu.Menu({id:g.id + "-hcols-menu"});
                this.colMenu.on("beforeshow", this.beforeColMenuShow, this);
                this.colMenu.on("itemclick", this.handleHdMenuClick, this);
                this.hmenu.add('-', {
                    itemId:"columns",
                    hideOnClick: false,
                    text: this.columnsText,
                    menu: this.colMenu,
                    iconCls: 'x-cols-icon'
                });
            }
            this.hmenu.on("itemclick", this.handleHdMenuClick, this);
        }

        if(g.trackMouseOver){
             this.mainBody.on("mouseover", this.onRowOver, this);
             this.mainBody.on("mouseout", this.onRowOut, this);
        }

        if(g.enableDragDrop || g.enableDrag){
            this.dragZone = new Ext.grid.GridDragZone(g, {
                ddGroup : g.ddGroup || 'GridDD'
            });
        }

        this.updateHeaderSortState();

    },

    // private
    layout : function(){
        if(!this.mainBody){
            return; // not rendered
        }
        var g = this.grid;
        var c = g.getGridEl();
        var csize = c.getSize(true);
        var vw = csize.width;

        if(vw < 20 || csize.height < 20){ // display: none?
            return;
        }
        
        if(g.autoHeight){
            this.scroller.dom.style.overflow = 'visible';
            if(Ext.isWebKit){
                this.scroller.dom.style.position = 'static';
            }
        }else{
            this.el.setSize(csize.width, csize.height);

            var hdHeight = this.mainHd.getHeight();
            var vh = csize.height - (hdHeight);

            this.scroller.setSize(vw, vh);
            if(this.innerHd){
                this.innerHd.style.width = (vw)+'px';
            }
        }
        if(this.forceFit){
            if(this.lastViewWidth != vw){
                this.fitColumns(false, false);
                this.lastViewWidth = vw;
            }
        }else {
            this.autoExpand();
            this.syncHeaderScroll();
        }
        this.onLayout(vw, vh);
    },

    // template functions for subclasses and plugins
    // these functions include precalculated values
    onLayout : function(vw, vh){
        // do nothing
    },

    onColumnWidthUpdated : function(col, w, tw){
        //template method
    },

    onAllColumnWidthsUpdated : function(ws, tw){
        //template method
    },

    onColumnHiddenUpdated : function(col, hidden, tw){
        // template method
    },

    updateColumnText : function(col, text){
        // template method
    },

    afterMove : function(colIndex){
        // template method
    },

    /* ----------------------------------- Core Specific -------------------------------------------*/
    // private
    init : function(grid){
        this.grid = grid;

        this.initTemplates();
        this.initData(grid.store, grid.colModel);
        this.initUI(grid);
    },

    // private
    getColumnId : function(index){
      return this.cm.getColumnId(index);
    },
    
    // private 
    getOffsetWidth : function() {
        return (this.cm.getTotalWidth() + this.scrollOffset) + 'px';
    },

    // private
    renderHeaders : function(){
        var cm = this.cm, ts = this.templates;
        var ct = ts.hcell;

        var cb = [], p = {};
        var len = cm.getColumnCount();
        var last = len - 1;
        for(var i = 0; i < len; i++){
            p.id = cm.getColumnId(i);
            p.value = cm.getColumnHeader(i) || "";
            p.style = this.getColumnStyle(i, true);
            p.tooltip = this.getColumnTooltip(i);
            p.css = i == 0 ? 'x-grid3-cell-first ' : (i == last ? 'x-grid3-cell-last ' : '');
            if(cm.config[i].align == 'right'){
                p.istyle = 'padding-right:16px';
            } else {
                delete p.istyle;
            }