設置按鈕出現在懸停

Question

我有角4材料表格單元格中的按鈕，我想只出現在時錶行懸停：

<md-cell *cdkCellDef="let row" contenteditable='false' > 
     <div *ngIf="!row.editorEnabled" >{{row.goalStatusName}} 
      <button md-icon-button><md-icon (click)="row.editorEnabled=true;" mdTooltip="Edit">mode_edit</md-icon></button> 
      </div> 
</md-cell> 

如何實現這一目標？

更新： 整個代碼：

<md-cell *cdkCellDef="let row" contenteditable='false' > 
     <div *ngIf="!row.editorEnabled" >{{row.goalStatusName}} 
      <button md-icon-button><md-icon (click)="row.editorEnabled=true;" class="editButton" mdTooltip="Edit">mode_edit</md-icon></button> 
      </div> 
     <div *ngIf="row.editorEnabled" > 
      <md-input-container><input mdInput [(ngModel)]="row.goalStatusName" #goalName></md-input-container> 
      <button md-icon-button> 
       <md-icon (click)="modifyGoal(row.goalStatusId,row.goalStatusName)" mdTooltip="Save" style="color:green;font:bold;" >done</md-icon> 
      </button> 
      <button md-icon-button> 
       <md-icon (click)="row.editorEnabled=false" mdTooltip="Cancel" style="color:red;font:bold;" >clear</md-icon> 
      </button> 
      </div> 
    </md-cell> 

Answer 1

button{ display:none} 
md-cell:hover{ 

    button{ 
    display:block 
    } 
} 

Answer 2

.editButton{ visibility: hidden} 
md-cell:hover .editButton{ 
visibility: visible; 
} 

這個工作！