这是将节点从源调色板拖到目标组中的一种方法:
小提琴:http: //jsfiddle.net/m1erickson/xtVyL/
网络节点由小图标表示(它们是非常小的动态图像对象)。
用户可以将任何图标从源调色板拖到任何目标组。
这些组只是画布上定义的区域,但可以是 Kinetc.Groups 以获得更大的灵活性。
在 dragend 事件期间,将在目标组中创建拖动图标的新副本。
dragend 事件完成后,原始的调色板图标会自动从新创建的重复图标中拖动到目标组周围(但不能在该组之外)。
这是代码和小提琴:http: //jsfiddle.net/m1erickson/xtVyL/
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Prototype</title>
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.5.min.js"></script>
<style>
#container{
border:solid 1px #ccc;
margin-top: 10px;
width:350px;
height:350px;
}
</style>
<script>
$(function(){
var stage = new Kinetic.Stage({
container: 'container',
width: 350,
height: 350
});
var layer = new Kinetic.Layer();
stage.add(layer);
// image loader
var imageURLs=[];
var imagesOK=0;
var imgs=[];
imageURLs.push("https://dl.dropboxusercontent.com/u/139992952/stackoverflow/tempPC.png");
imageURLs.push("https://dl.dropboxusercontent.com/u/139992952/stackoverflow/tempServer.png");
imageURLs.push("https://dl.dropboxusercontent.com/u/139992952/stackoverflow/tempRouter.png");
loadAllImages();
function loadAllImages(callback){
for (var i = 0; i < imageURLs.length; i++) {
var img = new Image();
imgs.push(img);
img.onload = function(){
imagesOK++;
if (imagesOK==imageURLs.length ) {
start();
}
};
img.src = imageURLs[i];
}
}
// top icon positions
var nextIconX=20;
var nextIconY=20;
// define groups
var groups=[];
groups.push({x:0,y:100,w:175,h:250,fill:"skyblue"});
groups.push({x:175,y:100,w:175,h:250,fill:"cornsilk"});
// add boundary info to each group
// draw colored rect to show group area
for(var i=0;i<groups.length;i++){
var g=groups[i];
g.left=g.x;
g.right=g.x+g.w;
g.top=g.y;
g.bottom=g.y+g.h;
var rect=new Kinetic.Rect({
x:g.x,
y:g.y,
width:g.w,
height:g.h,
fill:g.fill,
stroke:"gray"
});
layer.add(rect);
}
// hittest for each group
function groupHit(x,y){
for(var i=0;i<groups.length;i++){
var g=groups[i];
if(x>g.left && x<g.right && y>g.top && y<g.bottom){return(i);}
}
return(-1);
}
function start(){
makePaletteIcon(imgs[0]);
makePaletteIcon(imgs[1]);
makePaletteIcon(imgs[2]);
layer.draw();
}
function makePaletteIcon(img){
// make an icon that stays in the pallette tray
var fixedIcon=newImage(nextIconX,nextIconY,img,false);
layer.add(fixedIcon);
// make an icon that is dragged from the tray to a group
var dragIcon=makeDraggableIcon(nextIconX,nextIconY,img);
layer.add(dragIcon);
// calc the next icon position
nextIconX+=(img.width+20);
}
function makeDraggableIcon(x,y,img){
var i=newImage(x,y,img,true);
//
i.trayX=x;
i.trayY=y;
//
i.setOpacity(0.50);
i.on("dragend",function(){
var x=this.getX();
var y=this.getY();
// if this pallette icon was not dropped in a group
// put the icon back in the tray and return
var hit=groupHit(x,y);
if(hit==-1){
this.setPosition(this.trayX,this.trayY);
return;
}
// add a copy of this icon to the drop group
var component=newImage(x,y,this.getImage(),true);
// set drag limits
var group=groups[hit];
component.maxDragLeft=group.left;
component.maxDragRight=group.right;
component.maxDragTop=group.top;
component.maxDragBottom=group.bottom;
// limit component dragging to inside the assigned group
component.setDragBoundFunc(function(pos) {
var xx=pos.x;
var yy=pos.y;
var w=this.getWidth();
var h=this.getHeight();
if(pos.x<this.maxDragLeft){xx=this.maxDragLeft;}
if(pos.x+w>this.maxDragRight){xx=this.maxDragRight-w;}
if(pos.y<this.maxDragTop){yy=this.maxDragTop;}
if(pos.y+h>this.maxDragBottom){yy=this.maxDragBottom-h;}
return{ x:xx, y:yy };
});
layer.add(component);
// move the dragIcon back into the pallette tray
this.setPosition(this.trayX,this.trayY);
layer.draw();
});
return(i);
}
// make a new Kinetic.Image
function newImage(x,y,img,isDraggable){
var i=new Kinetic.Image({
image:img,
x: x,
y: y,
width: img.width,
height: img.height,
draggable:isDraggable
});
return(i);
}
}); // end $(function(){});
</script>
</head>
<body>
<p>Drag any icon from top into blue or yellow group</p>
<div id="container"></div>
</body>
</html>