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       
(Showing Draft Content)

单元格实现绘制图标

问题:如何自定义单元格实现绘制图表


SpreadJS的自定义单元格有着强大的自定义特性。有小伙伴想要将已有的图标绘制在单元格上,但是发现绘制的图标没有显示。这是因为图片的加载是异步的。


这边提供一个简单的Demo如下:

var img = undefined;
function ImageCellType() {}
ImageCellType.prototype = new GC.Spread.Sheets.CellTypes.Text();
ImageCellType.prototype.paint = function (
  ctx,
  value,
  x,
  y,
  width,
  height,
  style,
  context
) {
  spreadNS.CellTypes.RowHeader.prototype.paint.apply(this, arguments);
  if (img) {
    ctx.save();
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.drawImage(img, x + 90, y, 20, 20);
    ctx.restore();
    return;
  } //创建新的图片对象
  img = new Image(); //指定图片的URL
  img.src = "2.png"; //浏览器加载图片完毕后再绘制图片
  img.onload = function () {
    context.sheet.repaint();
  };
};

显示效果如下:

image

在代码中,我们先定义了一个img的变量,然后为了让这个单元格可以编辑,我们继承了text。

里面的if语句判断是都有img,有则进入绘制,在drawImage中的参数分别为图标、X轴距离、Y轴距离,以及宽高。

另外,需要注意的是第二个参数可以加上变量的这样可以以防在不同的页面大小下,出现绘制位置不一致的情况。

最后在图片加载完成后,调用repaint方法,将图标绘制。