[QUESTIONS] Creating image map on canvas

var bm = editor.BlockManager;
  bm.add('link-block3', {
        category: 'Basic',
        label: 'Link Block3',
        attributes: { class: 'fa fa-link' },
        content: {
            type: 'link',
           droppable: true,
            draggable: true,
            resizable: true,
            attributes: { class: 'fa fa-link' },
            style: {
                display: 'inline-block',
                padding: '5px',
                'min-height': '50px',
                'min-width': '50px'
            }
        },
    });

canvas:dragover will trigger only when blocks are dragged inside the canvas. Is there any solutions or events which I can trigger to select the canvas?