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禁止双击自适应列宽行为

需求：如何将双击自适应列宽的功能禁止

背景：

在SpreadJS中双击两列中间的竖线位置时，会根据单元格文本自适应改变列宽。

客户希望禁止此行为，使列保持一个固定的宽度，如何实现呢？

解决方案：

了解需求后，第一个思路是可以通过表单保护实现。但是设置表单保护后拖拽改变列宽的行为也被禁用了，不符合用户需求。

所以尝试从事件入手，双击或者拖拽都可以改变列宽，所以均可以触发ColumnWidthChanging事件，在事件内部可以根据实际业务需要做判断（比如判断如果是第二列），如果不希望列宽改变，则执行cancel为true，即取消列宽改变的行为。

不过需要注意的使，目前事件内没有属性可以区分是拖拽还是双击改变列宽行为，但是双击的时候是执行了autoFitColumn这个命令，你可以通过重写这个命令来标记此行为。

var oldAutoFitColumn = GC.Spread.Sheets.Commands.autoFitColumn.execute;
GC.Spread.Sheets.Commands.autoFitColumn.execute = function (
  context,
  options,
  isUndo
) {
  var Commands = GC.Spread.Sheets.Commands;
  if (isUndo) {
    Commands.undoTransaction(context, options);
    return true;
  } else {
    Commands.startTransaction(context, options);
    sheet.suspendPaint();
    console.log("autoFitColumn");
    var a = oldAutoFitColumn.call(this, context, options, isUndo);
    sheet.resumePaint();

    Commands.endTransaction(context, options);
    return true;
  }
};

详情Demo，请参考附件demo.html

作者: Lynn.Dou | 审核：Lynn.Dou | 更新时间：2023.12.12