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jQuery拖拽通过八个点改变div大小
js:
(function($) {
/**
* 默认参数
*/
var defaultOpts = {
stage: document, //舞台
item: 'resize-item', //可缩放的类名
};
/**
* 定义类
*/
var ZResize = function(options) {
this.options = $.extend({}, defaultOpts, options);
this.init();
}
ZResize.prototype = {
init: function() {
this.initResizeBox();
},
/**
* 初始化拖拽item
*/
initResizeBox: function() {
var self = this;
$(self.options.item).each(function () {
//创建面板
var width = $(this).width();
var height = $(this).height();
var resizePanel = $('<div class"resize-panel"></div>');
resizePanel.css({
width: width,
height: height,
top: 0,
left: 0,
position: 'absolute',
'background-color': 'rgba(0,0,0,0.5)',
cursor: 'move',
display: 'none'
});
self.appendHandler(resizePanel, $(this));
/**
* 创建控制点
*/
var n = $('<div class="n"></div>');//北
var s = $('<div class="s"></div>');//南
var w = $('<div class="w"></div>');//西
var e = $('<div class="e"></div>');//东
var ne = $('<div class="ne"></div>');//东北
var nw = $('<div class="nw"></div>');//西北
var se = $('<div class="se"></div>');//东南
var sw = $('<div class="sw"></div>');//西南
//添加公共样式
self.addHandlerCss([n, s, w, e, ne, nw, se, sw]);
//添加各自样式
n.css({
'top': '-4px',
'margin-left': '-4px',
'left': '50%',
'cursor': 'n-resize'
});
s.css({
'bottom': '-4px',
'margin-left': '-4px',
'left': '50%',
'cursor': 's-resize'
});
e.css({
'top': '50%',
'margin-top': '-4px',
'right': '-4px',
'cursor': 'e-resize'
});
w.css({
'top': '50%',
'margin-top': '-4px',
'left': '-4px',
'cursor': 'w-resize'
});
ne.css({
'top': '-4px',
'right': '-4px',
'cursor': 'ne-resize'
});
nw.css({
top: '-4px',
'left': '-4px',
'cursor': 'nw-resize'
});
se.css({
'bottom': '-4px',
'right': '-4px',
'cursor': 'se-resize'
});
sw.css({
'bottom': '-4px',
'left': '-4px',
'cursor': 'sw-resize'
});
// 添加项目
self.appendHandler([n, s, w, e, ne, nw, se, sw], resizePanel);
//绑定拖拽缩放事件
self.bindResizeEvent(resizePanel, $(this));
//绑定触发事件
self.bindTrigger($(this));
});
self.bindHidePanel();
},
//控制点公共样式
addHandlerCss: function(els) {
for(var i = 0; i < els.length; i++) {
el = els[i];
el.css({
position: 'absolute',
width: '8px',
height: '8px',
background: '#ff6600',
margin: '0',
'border-radius': '2px',
border: '1px solid #dd5500',
});
}
},
/**
* 插入容器
*/
appendHandler: function(handlers, target) {
for(var i = 0; i < handlers.length; i++) {
el = handlers[i];
target.append(el);
}
},
/**
* 显示拖拽面板
*/
triggerResize: function(el) {
var self = this;
el.siblings(self.options.item).children('div').css({
display: 'none'
});
el.children('div').css({
display: 'block'
});
},
/**
* 拖拽事件控制 包含8个缩放点 和一个拖拽位置
*/
bindResizeEvent: function(el) {
var self = this;
var ox = 0; //原始事件x位置
var oy = 0; //原始事件y位置
var ow = 0; //原始宽度
var oh = 0; //原始高度
var oleft = 0; //原始元素位置
var otop = 0;
var org = el.parent('div');
//东
var emove = false;
el.on('mousedown','.e', function(e) {
ox = e.pageX;//原始x位置
ow = el.width();
emove = true;
});
//南
var smove = false;
el.on('mousedown','.s', function(e) {
oy = e.pageY;//原始x位置
oh = el.height();
smove = true;
});
//西
var wmove = false;
el.on('mousedown','.w', function(e) {
ox = e.pageX;//原始x位置
ow = el.width();
wmove = true;
oleft = parseInt(org.css('left').replace('px', ''));
});
//北
var nmove = false;
el.on('mousedown','.n', function(e) {
oy = e.pageY;//原始x位置
oh = el.height();
nmove = true;
otop = parseInt(org.css('top').replace('px', ''));
});
//东北
var nemove = false;
el.on('mousedown','.ne', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
nemove = true;
otop = parseInt(org.css('top').replace('px', ''));
});
//西北
var nwmove = false;
el.on('mousedown','.nw', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
otop = parseInt(org.css('top').replace('px', ''));
oleft = parseInt(org.css('left').replace('px', ''));
nwmove = true;
});
//东南
var semove = false;
el.on('mousedown','.se', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
semove = true;
});
//西南
var swmove = false;
el.on('mousedown','.sw', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
ow = el.width();
oh = el.height();
swmove = true;
oleft = parseInt(org.css('left').replace('px', ''));
});
//拖拽
var drag = false;
el.on('mousedown', function(e) {
ox = e.pageX;//原始x位置
oy = e.pageY;
otop = parseInt(org.css('top').replace('px', ''));
oleft = parseInt(org.css('left').replace('px', ''));
drag = true;
});
$(self.options.stage).on('mousemove', function(e) {
if(emove) {
var x = (e.pageX - ox);
el.css({
width: ow + x
});
org.css({
width: ow + x
});
} else if(smove) {
var y = (e.pageY - oy);
el.css({
height: oh + y
});
org.css({
height: oh + y
});
} else if(wmove) {
var x = (e.pageX - ox);
el.css({
width: ow - x,
// left: oleft + x
});
org.css({
width: ow - x,
left: oleft + x
});
} else if(nmove) {
var y = (e.pageY - oy);
el.css({
height: oh - y,
// top: otop + y
});
org.css({
height: oh - y,
top: otop + y
});
} else if(nemove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
height: oh - y,
// top: otop + y,
width: ow + x
});
org.css({
height: oh - y,
top: otop + y,
width: ow + x
});
} else if(nwmove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
height: oh - y,
// top: otop + y,
width: ow - x,
// left: oleft + x
});
org.css({
height: oh - y,
top: otop + y,
width: ow - x,
left: oleft + x
});
} else if(semove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
width: ow + x,
height: oh + y
});
org.css({
width: ow + x,
height: oh + y
});
} else if(swmove) {
var x = e.pageX - ox;
var y = e.pageY - oy;
el.css({
width: ow - x,
// left: oleft + x,
height: oh + y
});
org.css({
width: ow - x,
left: oleft + x,
height: oh + y
});