KineticJS从一层拖放到另一层

Question

现在，我在左图上绘制了一个舞台，两个图层和图像。我通过添加属性draggable: true使图像可拖动。我找到的所有拖放样本（kinetic docs，tutorials，jsfiddles ...）都位于同一区域内。

我该怎么做才能让谁是左层上绘制的项目将在合适的层仅下降，否则，让他们在jQuery的恢复一样（如果它是可执行的）？

这是我编辑的the jsfiddle。帮帮我！

Answer 1

你需要做的是复制对象，激发dragstart事件，然后在dragend上检查项目是否放置在正确的容器中，否则将其动画回原始容器。

实施例而不复归：http://cs.neiu.edu/~tsam/physics/index.phtml（可以与用户登录：测试，通过：测试）

示例代码：

itemBeingCloned.on（ '鼠标按下touchstart'，函数（）{ 变种userPos = stage.getPointerPosition（）;

var cloneOfItem= new Kinetic.Image({ 
     image: imageObj, // image of object being cloned 
     x: userPos.x, 
     y: userPos.y, 
     height: 25, // or set the height 
     width: 25, // or set the width 
     draggable: true, 
     offset: 12, 
     dragOnTop: false // you might actually allow this to be true 
    }); 
    yourTemporaryLayer.add(cloneOfItem); // well, you need to store this in a layer temporarily, you should have a layer which takes up the whole stage, and two child layers under it, left and right 

    /* Lets define the behavior (events) of the item you want to copy */ 
    cloneOfItem.on('dragmove', function(){ 
     // in case you need to do something while moving the item 
    }); 

    cloneOfItem.on('dragend', function(){ // once you are done dragging, check if placing somewhere, most of the logic will go here 
     // check if on right side, 
      //if so, add to right layer, else 
      //else animate back to original position, then destroy 
    }); 

    cloneOfItem.on('dblclick dbltap', function(evt){ // in case you want to remove the item, I defined it as double-click event destroying the item 
     this.remove(); // remove from layer 
     this.destroy(); // destroy object 
    }); 

    /* so when you do mousedown on the original item, it will create the item, and fire the previously defined events (above) */ 
    cloneOfItem.fire('mousedown'); 
    cloneOfItem.fire('touchstart'); 
    cloneOfItem.fire('dragstart'); 

    yourRightLayer.draw(); //redraw the layer just in case? maybe not needed 

}); 

更新（更简单）

示例代码：

itemBeingCloned.on('mousedown touchstart', function(){ 
    var userPos = stage.getPointerPosition(); 

    var cloneOfItem= itemBeingCloned.clone(); 

    yourTemporaryLayer.add(cloneOfItem); // well, you need to store this in a layer temporarily, you should have a layer which takes up the whole stage, and two child layers under it, left and right 

    cloneOfItem.on('dragend', function(){ // once you are done dragging, check if placing somewhere, most of the logic will go here 
     // check if on right side, 
      //if so, add to right layer, else 
      //else animate back to original position, then destroy 
    }); 

    /* so when you do mousedown on the original item, it will create the item, and fire the previously defined events (above) */ 
    cloneOfItem.fire('mousedown'); 
    cloneOfItem.fire('touchstart'); 
    cloneOfItem.fire('dragstart'); 

    yourRightLayer.draw(); //redraw the layer just in case? maybe not needed 

}); 

更新：这里是一个非常粗略的实施 http://jsfiddle.net/GLFxF/16/