【发布时间】：2015-01-27 19:13:50
【问题描述】：
当我在 5-6 次拖放后有时在移动设备中继续连续拖动对象时，我看到有时对象不会恢复原状并且我以后无法使用。
基本上我在画布上制作了两个对象的组，所以有时最多可以有两个图像不超过， 另见图片
为什么会发生我该如何预防是请解决
(function () {
var canvas = new fabric.Canvas('canvas');
var canvas_el = document.getElementById('canvas');
var canvas1 = new fabric.Canvas('canvas1');
var group;
fabric.Image.fromURL('img/blank.png', function (img) {
var img1 = img.set({
left: 0,
top: 0
});
fabric.Image.fromURL('img/blank.png', function (img) {
var img2 = img.set({
left: 0,
top: 0
});
group = new fabric.Group([img1, img2], {
left: 0,
top: 0
});
canvas.add(group)
});
});
fabric.Image.fromURL('img/blank.png', function (img) {
var img1 = img.set({
left: 0,
top: 0
});
fabric.Image.fromURL('img/blank.png', function (img) {
var img2 = img.set({
left: 0,
top: 0
});
group1 = new fabric.Group([img1, img2], {
left: 0,
top: 0
});
canvas1.add(group1)
});
});
$(document).ready(function () {
/* Define drag and drop zones */
var $drop = $('#canvas-drop-area,#canvas-drop-area1'),
$gallery = $('td > #image-list li'),
$draggedImage=null;
/* Define the draggable properties */
$gallery.draggable({
helper: 'clone',
start: function (e) {
$draggedImage=event.target;
$drop.css({
'display': 'block'
})
},
stop: function () {
$(this).find('img').css({
/* 'opacity': 0.4 */
});
$drop.css({
'display': 'none'
});
$draggedImage=null;
},
revert: true
});
/* Define the events for droppable properties */
$drop.droppable({
over: function (event, ui) {
$(this).addClass('active');
},
drop: function (event, ui) {
var image =$draggedImage&& $draggedImage.src;
console.log($draggedImage.alt);
img_to_canvas(image,$draggedImage.alt,$(event.target).is("#canvas-drop-area")?1:2);
},
out: function (event, ui) {
$(this).removeClass('active');
},
deactivate: function (event, ui) {
$(this).removeClass('active');
}
});
});
var img_to_canvas = function(image,sendfront,checkcanvas) {
var img = new Image();
img.src = image;
if(checkcanvas =='1'){
if(sendfront=='top'){
fabric.util.loadImage(img.src, function (img) {
group.item(0).setElement(img);
canvas.renderAll();
});
}else{
fabric.util.loadImage(img.src, function (img) {
group.item(1).setElement(img);
canvas.renderAll();
});
}
canvas.calcOffset();
}else{
if(sendfront=='top'){
fabric.util.loadImage(img.src, function (img) {
group1.item(0).setElement(img);
canvas1.renderAll();
});
}else{
fabric.util.loadImage(img.src, function (img) {
group1.item(1).setElement(img);
canvas1.renderAll();
});
}
canvas1.calcOffset();
}
}
})();
【问题讨论】：
标签： javascript android jquery drag-and-drop fabricjs