javascript - 在 Canvas Fabric JS 中的元素上添加删除按钮

Question

您好，我想使用 FabricJS 在元素中添加删除按钮。我有一个例子:

我尝试添加这部分代码，但是当我调整图像大小时，删除按钮不在原位。

http://jsfiddle.net/wxao1on8/13/

   function addDeleteBtn(x, y, w){
        $(".deleteBtn").remove();
        var btnLeft = x;
        var btnTop = y - 30;
        var widthadjust=w/2;
        btnLeft=widthadjust+btnLeft-1
        var deleteBtn = '<img src="https://www.funagain.com/images/old/common/delete-icon.png" class="deleteBtn" ' +
                'style="position:absolute;top:'+btnTop+'px;right:'+btnLeft+'px;cursor:pointer;"/>';
        $(".canvas-container").append(deleteBtn);
    }

    canvas.on('object:selected',function(e){
        addDeleteBtn(e.target.oCoords.mt.x, e.target.oCoords.mt.y, e.target.width);
    });

    canvas.on('mouse:down',function(e){
        if(!canvas.getActiveObject())
        {
            $(".deleteBtn").remove();
        }
    });

    canvas.on('object:modified',function(e){
        addDeleteBtn(e.target.oCoords.mt.x, e.target.oCoords.mt.y, e.target.width);
    });

    canvas.on('object:moving',function(e){
        $(".deleteBtn").remove();
    });

    $(document).on('click',".deleteBtn",function(){
        if(canvas.getActiveObject())
        {
            canvas.remove(canvas.getActiveObject());
            $(".deleteBtn").remove();
        }
    });

Answer 1

target.oCoords.mt 是中上 Angular 。

改用右上角:e.target.oCoords.tr

    var canvas = new fabric.Canvas('canvas');
var HideControls = {
            'tl':true,
            'tr':false,
            'bl':true,
            'br':true,
            'ml':true,
            'mt':true,
            'mr':true,
            'mb':true,
            'mtr':true
        };
fabric.Image.fromURL('http://serio.piiym.net/CVBla/txtboard/thumb/1260285874089s.jpg', function (img) {
    img.top = 60;
    img.left = 30;
    img.setControlsVisibility(HideControls);
    canvas.add(img);
});

canvas.renderAll();

function addDeleteBtn(x, y){
    $(".deleteBtn").remove(); 
    var btnLeft = x-10;
    var btnTop = y-10;
    var deleteBtn = '<img src="https://www.funagain.com/images/old/common/delete-icon.png" class="deleteBtn" style="position:absolute;top:'+btnTop+'px;left:'+btnLeft+'px;cursor:pointer;width:20px;height:20px;"/>';
    $(".canvas-container").append(deleteBtn);
}

canvas.on('object:selected',function(e){
        addDeleteBtn(e.target.oCoords.tr.x, e.target.oCoords.tr.y);
});

canvas.on('mouse:down',function(e){
    if(!canvas.getActiveObject())
    {
        $(".deleteBtn").remove(); 
    }
});

canvas.on('object:modified',function(e){
    addDeleteBtn(e.target.oCoords.tr.x, e.target.oCoords.tr.y);
});

canvas.on('object:scaling',function(e){
    $(".deleteBtn").remove(); 
});
canvas.on('object:moving',function(e){
    $(".deleteBtn").remove(); 
});
canvas.on('object:rotating',function(e){
    $(".deleteBtn").remove(); 
});
$(document).on('click',".deleteBtn",function(){
    if(canvas.getActiveObject())
    {
        canvas.remove(canvas.getActiveObject());
        $(".deleteBtn").remove();
    }
});