Fabricjs，选择手柄显示，但在与其他形状一起选择之前不可单击

// 创建一个 Fabric.js 画布
const canvas = new fabric.Canvas('canvas');

// 添加一些图形
const rect = new fabric.Rect({
  left: 50,
  top: 50,
  fill: 'red',
  width: 100,
  height: 100
});

const circle = new fabric.Circle({
  left: 200,
  top: 200,
  fill: 'blue',
  radius: 50
});

canvas.add(rect, circle);

// 自定义选择逻辑
canvas.on('mouse:down', (options) => {
  const target = options.target;
  if (target && target.selectable) {
    canvas.setActiveObject(target);
  }
});

canvas.on('mouse:move', (options) => {
  const activeObject = canvas.getActiveObject();
  if (activeObject) {
    canvas.renderAll();
  }
});

canvas.on('mouse:up', (options) => {
  const activeObject = canvas.getActiveObject();
  if (activeObject) {
    console.log('Selected object:', activeObject);
  }
});