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我正在尝试使 angular material 6 flex table 的各个列可以调整大小。我在我分配的列宽中使用了一种方法调整大小，但是当我尝试调整一列的大小时，所有列都在调整大小。这是stackblitzlink。

这是调整大小的方法代码

  resizeTable(event: any, column: any) {
      this.start = event.target;
      this.pressed = true;
      this.startX = event.pageX;
      this.startWidth = this.start.clientWidth;
      this.mouseMove(column);
  }

  mouseMove(column: any) {
      this.resizableFnMousemove = <any>this.renderer.listen('document', 'mousemove', (event) => {
          if (this.pressed) {
              const width = this.startWidth + (event.pageX - this.startX);
              const index = this.start.cellIndex;
              column.width = width;
          }
       });
       this.resizableFnMouseup = <any>this.renderer.listen('document', 'mouseup', (event) => {
       if (this.pressed) {
           this.pressed = false;
           this.resizableFnMousemove();
           this.resizableFnMouseup();
       }
     });
  }
}

下面是表格html代码。

  <h3>Basic Table</h3>
  <mat-table [dataSource]="dataSource" class="mat-elevation-z8">

    <!-- Position Column -->
    <ng-container matColumnDef="position" #col>
      <mat-header-cell  [ngStyle]="{'width': col.width > 0 ? col.width + 'px':'300px'}"  
         (mousedown)="resizeTable($event, col)" *matHeaderCellDef > No. </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>
    </ng-container>

    <!-- Name Column -->
    <ng-container matColumnDef="name" col1>
      <mat-header-cell  [ngStyle]="{'width': col1.width > 0 ? col1.width + 'px':'300px'}" *matHeaderCellDef 
          (mousedown)="resizeTable($event, col1)"> Name </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>
    </ng-container>

    <!-- Weight Column -->
    <ng-container matColumnDef="weight" col2>
      <mat-header-cell  [ngStyle]="{'width': col2.width > 0 ? col2.width + 'px':'300px'}" *matHeaderCellDef
          (mousedown)="resizeTable($event, col2)"> Weight </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>
    </ng-container>

    <!-- Symbol Column -->
    <ng-container matColumnDef="symbol" col3>
      <mat-header-cell  [ngStyle]="{'width': col3.width > 0 ? col3.width + 'px':'300px'}" *matHeaderCellDef 
         > Symbol </mat-header-cell>
      <mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>
    </ng-container>

    <mat-header-row  *matHeaderRowDef="displayedColumns"></mat-header-row>
    <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
  </mat-table>

请帮助我解决此问题，如果我在实施此问题时出错，请纠正我并指导我如何显示调整大小图标。提前致谢。

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