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重写合并单元格命令

问题：如何重写合并单元格命令？

背景：

我们知道在线表格编辑器可以进行单元格的合并，但是有些场景，客户想在合并单元格前进行一些业务逻辑的处理，比如满足一定条件才能进行合并。

面对这样的需求，我们如何实现呢？

我们知道合并单元格调用的时MergeCenter的命令，那我们就可以对MergeCenter命令进行重写，加入自己的业务逻辑。

let mergeCenterCommand = GC.Spread.Sheets.Designer.getCommand(GC.Spread.Sheets.Designer.CommandNames.MergeCenter);
if (mergeCenterCommand) {
  let oldExecute = mergeCenterCommand.execute;
  mergeCenterCommand.execute = function (context, propertyName, args) {
    alert("开始合并单元格")
    //添加confirm逻辑

    oldExecute.call(this, context, propertyName, args);
  }
}
var config = GC.Spread.Sheets.Designer.DefaultConfig
config.commandMap[GC.Spread.Sheets.Designer.CommandNames.MergeCenter] = mergeCenterCommand;
var designer = GC.Spread.Sheets.Designer.findControl('gc-designer-container')
designer.setConfig(config)

重写命令后合并单元格的效果如下图所示：

作者: Steven.Lv| 审核：Ellia.Duan | 更新时间：2023.12.13