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/* - - - - - - - - - - - - - - - - - - - - - - - - * Stream 和 byte[] 之间的转换 * - - - - - - - - - - - - - - - - - - - - - - - */ /// <summary> /// 将 Stream 转成 byte[] /// </summary> public byte[] StreamToBytes(Stream stream) { byte[] bytes = new byte[stream.Length]; stream.Read(bytes, 0, bytes.Length); // 设置当前流的位置为流的开始 stream.Seek(0, SeekOrigin.Begin); return bytes; } /// <summary> /// 将 byte[] 转成 Stream /// </summary> public Stream BytesToStream(byte[] bytes) { Stream stream = new MemoryStream(bytes); return stream; } /* - - - - - - - - - - - - - - - - - - - - - - - - * Stream 和 文件之间的转换 * - - - - - - - - - - - - - - - - - - - - - - - */ /// <summary> /// 将 Stream 写入文件 /// </summary> public void StreamToFile(Stream stream,string fileName) { // 把 Stream 转换成 byte[] byte[] bytes = new byte[stream.Length]; stream.Read(bytes, 0, bytes.Length); // 设置当前流的位置为流的开始 stream.Seek(0, SeekOrigin.Begin); // 把 byte[] 写入文件 FileStream fs = new FileStream(fileName, FileMode.Create); BinaryWriter bw = new BinaryWriter(fs); bw.Write(bytes); bw.Close(); fs.Close(); } /// <summary> /// 从文件读取 Stream /// </summary> public Stream FileToStream(string fileName) { // 打开文件 FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); // 读取文件的 byte[] byte[] bytes = new byte[fileStream.Length]; fileStream.Read(bytes, 0, bytes.Length); fileStream.Close(); // 把 byte[] 转换成 Stream Stream stream = new MemoryStream(bytes); return stream; }   

 

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下面我们扩展一下刚才的示例应用一下EditorGridPanel


 

         //定义数组
var arr=[
    ['Bill', 'Gardener','2007-01-02',-10,true],
    [ 'Ben', 'Horticulturalist','2007-01-03',-20.1,false],
    ['你', 'Gardener','2007-02-02',0,true],
    ['他', 'Gardener','2007-01-04',13,false],
    [ '我', 'Horticulturalist','2007-01-05',15.2,false]
    ];
var reader = new Ext.data.ArrayReader(

   ...{},
//定义数组到record的映射关系
   [
    ...{name: 'name'},         
    ...{name: 'occupation', mapping: 1},
    ...{name:'date',type: 'date',dateFormat: 'Y-m-d'}, //用指定的格式转换日期
    ...{name:'float',type:'float'},
    ...{name:'bool',type:'bool'}
   ]
);
//生成元数据
 var store=new Ext.data.Store(...{
    reader:reader
    });
store.loadData(arr);


//自定义可编辑列,从ext的示例抄的,但是却要init郁闷
 Ext.grid.CheckColumn = function(config)...{
    Ext.apply(this, config);
    if(!this.id)...{
    this.id = Ext.id();
    }
    this.renderer = this.renderer.createDelegate(this);
};
//重写了三个方法,捕捉mousedown修改数据
Ext.grid.CheckColumn.prototype =...{
init : function(grid)...{
    this.grid = grid;
    this.grid.on('render', function()...{
    var view = this.grid.getView();
    view.mainBody.on('mousedown', this.onMouseDown, this);
    }, this);
},

onMouseDown : function(e, t)...{
    
    if(t.className && t.className.indexOf('x-grid3-cc-'+this.id) != -1)...{
    e.stopEvent();
    var index = this.grid.getView().findRowIndex(t);
    var record = this.grid.store.getAt(index);
    record.set(this.dataIndex, !record.data[this.dataIndex]);
    }
},

renderer : function(v, p, record)...{
    p.css += ' x-grid3-check-col-td';
    return '<div class="x-grid3-check-col'+(v?'-on':'')+' x-grid3-cc-'+this.id+'">&#160;</div>';
}
}

//绑定到bool字段
var checkColumn=new Ext.grid.CheckColumn(...{
   header: "布尔值",
   dataIndex: 'bool'
});


/**//*
    现在配置列信息,为了本地化日期选择器,请包含ext-lang-zh_CN.js,并修改Date.dayNames = ["日","一","二","三","四","五","六"];
    在Ext.apply(Ext.DatePicker.prototype, {...})中加入okText:"确定",cancelText:"取消";
*/
var col=new Ext.grid.ColumnModel([
    new Ext.grid.RowNumberer(...{header:'序号',width:30}),
    ...{header:'姓名',sortable: true,dataIndex:'name'},
    ...{header:'职业',sortable: true,dataIndex:'occupation'},
    ...{   
    id:'datacol',
    header:'日期',
    sortable:true,
    dataIndex:'date',renderer: Ext.util.Format.dateRenderer('Y年m月d日'),//格式化显示
    editor:new Ext.form.DateField()
     },
    ...{header:'数值',sortable:true,dataIndex:'float',renderer:formatFloat,align: 'right',editor:new Ext.form.NumberField()},  //自定义显示方式,右对齐
    checkColumn //这个"选择框列"看起来的确漂亮些,其实是通过修改背景图片实现的
]);



//配置视图信息
var view=new Ext.grid.GridView(...{forceFit:true,sortAscText :'正序', sortDescText :'倒序'});
view.columnsText='列显示/隐藏';

//现在我们看看可编辑的数据表格能用了吗        
var grid=new Ext.grid.EditorGridPanel(...{
    el:Ext.getBody(),
    height:200,
    width:400,
    store:store,
    cm:col,
    view:view
    });    
//为什么原例不需要init?
checkColumn.init(grid);
grid.render();

function formatFloat(val)...{
    var bgcolor;
    if(val>0)...{
    bgcolor='#FF0000';
    }else if(val<0)...{
    bgcolor='#00FF00';
    }
    else...{
    bgcolor='#000000';
    }
    return( ['<span style="color:',bgcolor,'">',val,'</span>'].join(''));
}