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       
(Showing Draft Content)

同时设置公式和值

问题:利用自定义特性实现在单元格上同时设置公式和值


背景:

在单元格设置过公式以及设置过值的朋友应该不难发现,我们的单元格上只允许设置公式或数值,如果两者同时设置,那么后设置的会将前面设置的覆盖。在单元格上的操作也是一样,这个也是与Excel相同的。

可以简单理解为是一个“互斥”的操作,因为单元格上设置了公式,那么所显示的就是公式计算所返回的值,那如果单元格上是赋值操作,那么就会显示设置的值。

就好比单元格上原本有一个公式,我双击进入编辑状态,然后将公式删除再输入我的值;或者是单元格上原本有一个数值,我双击进入编辑状态,然后将值删除输入了我的公式。

那么基于上面这样一种设计,我们应该如果实现这样一个需求呢?

解决方案:

当设值为 undefined 或 null 时,显示公式的计算结果,否则显示值。

在开始前,先来了解一个 API:evaluateFormula

image

上图是关于这个 API 参数的一个完整介绍以及 Demo,那么是用来干什么的呢?

这个接口可以直接用来计算我们所需的公式,利用我们的计算引擎,从而可以达到“脱离”单元格得到计算结果。

什么意思呢?就是通过这个接口,我们可以不需要在单元格上setFormula,就能拿到某些公式计算的值。

就像上面的示例那样,传入要计算的表单、公式以及基本行列索引,就可以进行计算并返回结果。这在某些场景下是非常有用的。

GC.Spread.Sheets.CalcEngine.evaluateFormula(sheet, "SUM(A1:A2)", 0, 0);

再往下就是我们自定义单元格的绘制逻辑了,在paint方法中,我们会在里面做一个判断,当单元格的值显示为null时,我们就将公式的结果绘制上去。当单元格的值不为空时,我们就显示原本的数值。

formulaValueCellType.prototype.paint = function (
  ctx,
  value,
  x,
  y,
  w,
  h,
  style,
  context
) {
  var sheet = context.sheet;
  if (value === null || value === void 0) {
    try {
      value = GC.Spread.Sheets.CalcEngine.evaluateFormula(sheet, this.formula);
    } catch {
      //do nothing;
    }
  } else {
    GC.Spread.Sheets.CellTypes.Text.prototype.paint.apply(this, arguments);
  }
  GC.Spread.Sheets.CellTypes.Text.prototype.paint.apply(this, arguments);
};

自定义单元格部分的主要逻辑就是上面的代码,比较简单,可以参考该链接下载附件去查看具体效果及完整代码。

作者: GrapeCity China | 审核:AlexZ | 更新时间:2023.09.26