我正在研究如何在移动盒子时显示指南,就像在 Google 文档绘图中一样。在开始编写自己的代码之前,我更喜欢开源代码或任何类型的指南。
- 我不需要在多个浏览器窗口之间进行拖放,因此我不需要 HTML5 拖放。
- 我还使用 jquery-ui-draggable 作为盒子。
最佳答案
jquery ui 已经内置了这个,请参见这个演示: http://jqueryui.com/demos/draggable/#snap-to
如果您坚持遵循指南,您可能必须 fork jqueryui 或查看源代码,看看是否可以扩展它。
<小时/>或者,您可以在 jQuery ui 之上添加您自己的捕捉功能,我已经使用它了一段时间, 虽然它看起来并不有趣,但至少它似乎也不是很难。
您可以在jsfiddle上查看示例:http://jsfiddle.net/x7uMh/103/ 更新:这有效 ~ jQuery 1.9 + jQueryUI 1.9。它在最新的 jquery+ui 中崩溃了。 懒得去看看问题到底是什么,但通常只是一些小问题。 以防万一该网站出现故障,代码如下:
CSS
body{
font-family: courier new, courier;
font-size: 12px;
}
.draggable{
border: 1px solid #ccc;
display: inline-block;
cursor: move;
position: absolute;
}
.guide{
display: none;
position: absolute;
left: 0;
top: 0;
}
#guide-h{
border-top: 1px dashed #55f;
width: 100%;
}
#guide-v{
border-left: 1px dashed #55f;
height: 100%;
}
html
<div class="draggable">drag me!</div>
<div class="draggable">you can drag me too, if you like</div>
<div class="draggable">hep hep</div>
<div id="guide-h" class="guide"></div>
<div id="guide-v" class="guide"></div>
javascript(确保包含 jquery + jquery ui)
var MIN_DISTANCE = 10; // minimum distance to "snap" to a guide
var guides = []; // no guides available ...
var innerOffsetX, innerOffsetY; // we'll use those during drag ...
$( ".draggable" ).draggable({
start: function( event, ui ) {
guides = $.map( $( ".draggable" ).not( this ), computeGuidesForElement );
innerOffsetX = event.originalEvent.offsetX;
innerOffsetY = event.originalEvent.offsetY;
},
drag: function( event, ui ){
// iterate all guides, remember the closest h and v guides
var guideV, guideH, distV = MIN_DISTANCE+1, distH = MIN_DISTANCE+1, offsetV, offsetH;
var chosenGuides = { top: { dist: MIN_DISTANCE+1 }, left: { dist: MIN_DISTANCE+1 } };
var $t = $(this);
var pos = { top: event.originalEvent.pageY - innerOffsetY, left: event.originalEvent.pageX - innerOffsetX };
var w = $t.outerWidth() - 1;
var h = $t.outerHeight() - 1;
var elemGuides = computeGuidesForElement( null, pos, w, h );
$.each( guides, function( i, guide ){
$.each( elemGuides, function( i, elemGuide ){
if( guide.type == elemGuide.type ){
var prop = guide.type == "h"? "top":"left";
var d = Math.abs( elemGuide[prop] - guide[prop] );
if( d < chosenGuides[prop].dist ){
chosenGuides[prop].dist = d;
chosenGuides[prop].offset = elemGuide[prop] - pos[prop];
chosenGuides[prop].guide = guide;
}
}
} );
} );
if( chosenGuides.top.dist <= MIN_DISTANCE ){
$( "#guide-h" ).css( "top", chosenGuides.top.guide.top ).show();
ui.position.top = chosenGuides.top.guide.top - chosenGuides.top.offset;
}
else{
$( "#guide-h" ).hide();
ui.position.top = pos.top;
}
if( chosenGuides.left.dist <= MIN_DISTANCE ){
$( "#guide-v" ).css( "left", chosenGuides.left.guide.left ).show();
ui.position.left = chosenGuides.left.guide.left - chosenGuides.left.offset;
}
else{
$( "#guide-v" ).hide();
ui.position.left = pos.left;
}
},
stop: function( event, ui ){
$( "#guide-v, #guide-h" ).hide();
}
});
function computeGuidesForElement( elem, pos, w, h ){
if( elem != null ){
var $t = $(elem);
pos = $t.offset();
w = $t.outerWidth() - 1;
h = $t.outerHeight() - 1;
}
return [
{ type: "h", left: pos.left, top: pos.top },
{ type: "h", left: pos.left, top: pos.top + h },
{ type: "v", left: pos.left, top: pos.top },
{ type: "v", left: pos.left + w, top: pos.top },
// you can add _any_ other guides here as well (e.g. a guide 10 pixels to the left of an element)
{ type: "h", left: pos.left, top: pos.top + h/2 },
{ type: "v", left: pos.left + w/2, top: pos.top }
];
}
希望有帮助, 最好的,汉斯。
关于jquery - 移动 jquery-ui-draggable 框时的指南,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10026234/