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dragarea.js
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dragarea.js
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/**
* author: "oujizeng",
* license: "MIT",
* github: "https://github.com/yangyuji/drag-area",
* name: "dragarea.js",
* version: "2.1.3"
*/
(function (root, factory) {
if (typeof module != 'undefined' && module.exports) {
module.exports = factory();
} else if ( typeof define == 'function' && define.amd ) {
define( function () { return factory(); } );
} else {
root['dragarea'] = factory();
}
}(this, function () {
'use strict'
var getEle = function (str) {
return document.getElementById(str);
};
var getCss = function (o, key) {
return o.currentStyle ? o.currentStyle[key] : window.getComputedStyle(o, null)[key];
};
var getScroll = function (scrollProp, offsetProp) {
if (typeof window[offsetProp] !== 'undefined') {
return window[offsetProp];
}
if (document.documentElement.clientHeight) {
return document.documentElement[scrollProp];
}
return document.body[scrollProp];
}
var getBoxContent = function (target) {
var boxContent = null, parent = target.parentNode;
// 获取标记的拖动元素
if (target.classList.contains('crop-box-content')) {
boxContent = target;
}
while(parent && boxContent == null) {
if (parent.classList && parent.classList.contains('crop-box-content')) {
boxContent = parent;
} else {
parent = parent.parentNode;
}
}
return boxContent
}
var getOffset = function (el) {
var rect = el.getBoundingClientRect();
return {
left: rect.left + getScroll('scrollLeft', 'pageXOffset'),
top: rect.top + getScroll('scrollTop', 'pageYOffset'),
width: rect.right - rect.left,
height: rect.bottom - rect.top
};
}
var dragarea = {
init: function(opt) {
var container = getEle(opt.container),
hotbox = getEle(opt.hotbox),
boxIdx = 1,
start = null,
flag = false,
addHotFlag = false,
dragPointFlag = false,
dragAreaFlag = false,
currentHotBox = null,
newHotBox = null;
if(!container || !hotbox) {
return
}
container.addEventListener('mousedown', function(e) {
e.stopImmediatePropagation();
// 获取可拖动范围
var usearea = getOffset(container),
// 当前触发对象
target = e.target;
//记录鼠标开始位置
start = {
x: e.clientX,
y: e.clientY
};
// 标记本次鼠标按下
flag = true;
// 禁止选择事件
document.onselectstart = function() {
return false;
}
// 禁止拖动
container.ondragstart = function () {
return false;
}
// 拖动新建热区
if (target.classList.contains('hot-area-img')) {
// 鼠标在容器内的相对位置
var relativePosition = {
x: start.x - parseInt(usearea.left),
y: start.y - parseInt(usearea.top)
};
// 创建一个新热区
newHotBox = hotbox.cloneNode(true);
newHotBox.dataset['index'] = boxIdx;
newHotBox.style.width = '0px';
newHotBox.style.height = '0px';
newHotBox.style.left = relativePosition.x + 'px';
newHotBox.style.top = relativePosition.y + 'px';
// 在确定用户拖动前隐藏，避免点击出现热区
newHotBox.style.display = 'none';
target.parentNode.appendChild(newHotBox);
document.onmousemove = function (e) {
if (flag) {
// 新增热区标签
addHotFlag = true;
// 显示热区
newHotBox.style.display = 'block';
// 移除其他框的active
removeOtherActive();
newHotBox.classList.add('active');
// 实际移动距离
var move = {
x: e.clientX - start.x,
y: e.clientY - start.y
};
// 向左上移动
if (move.x < 0 && move.y <= 0) {
// 限制不能超过容器
var limit = {
x: e.clientX < usearea.left ? usearea.left : e.clientX,
y: e.clientY < usearea.top ? usearea.top : e.clientY
};
// 应该移动距离
var distance = {
x: limit.x - start.x,
y: limit.y - start.y
};
// 随鼠标移动位置并放大
newHotBox.style.left = relativePosition.x - Math.abs(distance.x) + 'px';
newHotBox.style.top = relativePosition.y - Math.abs(distance.y) + 'px';
newHotBox.style.width = Math.abs(distance.x) + 'px';
newHotBox.style.height = Math.abs(distance.y) + 'px';
}
// 向左下移动
else if (move.x < 0 && move.y > 0) {
// 限制不能超过容器
var limit = {
x: e.clientX < usearea.left ? usearea.left : e.clientX,
y: e.clientY > usearea.top + usearea.height ? usearea.top + usearea.height : e.clientY
};
// 应该移动距离
var distance = {
x: limit.x - start.x,
y: limit.y - start.y
};
// 随鼠标移动位置并放大
newHotBox.style.left = relativePosition.x - Math.abs(move.x) > 0 ? relativePosition.x - Math.abs(move.x) + 'px' : '0px';
newHotBox.style.width = Math.abs(distance.x) + 'px';
newHotBox.style.height = Math.abs(distance.y) + 'px';
}
// 向右上移动
else if (move.x >= 0 && move.y < 0) {
// 限制不能超过容器
var limit = {
x: e.clientX > usearea.left + usearea.width ? usearea.left + usearea.width : e.clientX,
y: e.clientY < usearea.top ? usearea.top : e.clientY
};
// 应该移动距离
var distance = {
x: limit.x - start.x,
y: limit.y - start.y
};
// 随鼠标移动位置并放大
newHotBox.style.top = relativePosition.y - Math.abs(move.y) > 0 ? relativePosition.y - Math.abs(move.y) + 'px' : '0px';
newHotBox.style.width = Math.abs(distance.x) + 'px';
newHotBox.style.height = Math.abs(distance.y) + 'px';
}
// 向右下移动
else if (move.x > 0 && move.y > 0) {
// 限制不能超过容器
var limit = {
x: e.clientX > usearea.left + usearea.width ? usearea.left + usearea.width : e.clientX,
y: e.clientY > usearea.top + usearea.height ? usearea.top + usearea.height : e.clientY
};
// 随鼠标放大
newHotBox.style.width = limit.x - start.x + 'px';
newHotBox.style.height = limit.y - start.y + 'px';
}
}
}
}
var drag = getBoxContent(target);
// 拖动热区
if (drag) {
// 相对页面当前位置
var initPosition = getOffset(drag.parentNode);
// 相对container当前位置
var startPosition = {
x: drag.parentNode.style.left || getCss(drag.parentNode, 'left'),
y: drag.parentNode.style.top || getCss(drag.parentNode, 'top')
};
// 鼠标移动限制
var limitArea = {
maxLeft: usearea.left + usearea.width - (initPosition.left + initPosition.width - e.clientX),
maxTop: usearea.top + usearea.height - (initPosition.top + initPosition.height - e.clientY),
minLeft: usearea.left + (e.clientX - initPosition.left),
minTop: usearea.top + (e.clientY - initPosition.top)
};
document.onmousemove = function (e) {
if (flag) {
// 拖动热区标签
dragAreaFlag = true;
currentHotBox = drag.parentNode;
// 移除其他框的active
removeOtherActive();
currentHotBox.classList.add('active');
// 热区拖动限制
var movelimit = {
x: e.clientX > limitArea.maxLeft ? limitArea.maxLeft : e.clientX < limitArea.minLeft ? limitArea.minLeft : e.clientX,
y: e.clientY > limitArea.maxTop ? limitArea.maxTop : e.clientY < limitArea.minTop ? limitArea.minTop : e.clientY
};
drag.parentNode.style.left = parseInt(startPosition.x) + movelimit.x - start.x + 'px';
drag.parentNode.style.top = parseInt(startPosition.y) + movelimit.y - start.y + 'px';
}
}
}
// 拖动边框
if (target.classList.contains('cropper-point')) {
// 当前热区框
currentHotBox = target.parentNode;
// 相对container当前位置
var initAttr = {
width: currentHotBox.style.width || getCss(currentHotBox, 'width'),
height: currentHotBox.style.height || getCss(currentHotBox, 'height'),
left: currentHotBox.style.left || getCss(currentHotBox, 'left'),
top: currentHotBox.style.top || getCss(currentHotBox, 'top'),
direct: target.dataset.direct || 'se'
};
document.onmousemove = function (e) {
if (flag) {
// 拖动缩放标签
dragPointFlag = true;
// 鼠标移动距离
var moveArea = {
x: e.clientX > usearea.left + usearea.width ? usearea.left + usearea.width - start.x : e.clientX < usearea.left ? usearea.left - start.x : e.clientX - start.x,
y: e.clientY > usearea.top + usearea.height ? usearea.top + usearea.height - start.y : e.clientY < usearea.top ? usearea.top - start.y : e.clientY - start.y
}
if (initAttr.direct == 'e') {
var nowW = parseInt(initAttr.width) + parseInt(moveArea.x);
currentHotBox.style.width = nowW + 'px';
}
if (initAttr.direct == 's') {
var nowH = parseInt(initAttr.height) + parseInt(moveArea.y);
currentHotBox.style.height = nowH + 'px';
}
if (initAttr.direct == 'w') {
var nowW = parseInt(initAttr.width) - parseInt(moveArea.x);
var offLeft = parseInt(initAttr.left) + parseInt(moveArea.x);
currentHotBox.style.width = nowW + 'px';
currentHotBox.style.left = offLeft + 'px';
}
if (initAttr.direct == 'n') {
var nowH = parseInt(initAttr.height) - parseInt(moveArea.y);
var offTop = parseInt(initAttr.top) + parseInt(moveArea.y);
currentHotBox.style.height = nowH + 'px';
currentHotBox.style.top = offTop + 'px';
}
if (initAttr.direct == 'ne') {
var nowW = parseInt(initAttr.width) + parseInt(moveArea.x);
var nowH = parseInt(initAttr.height) - parseInt(moveArea.y);
var offTop = parseInt(initAttr.top) + parseInt(moveArea.y);
currentHotBox.style.height = nowH + 'px';
currentHotBox.style.top = offTop + 'px';
currentHotBox.style.width = nowW + 'px';
}
if (initAttr.direct == 'nw') {
var nowH = parseInt(initAttr.height) - parseInt(moveArea.y);
var offTop = parseInt(initAttr.top) + parseInt(moveArea.y);
var nowW = parseInt(initAttr.width) - parseInt(moveArea.x);
var offLeft = parseInt(initAttr.left) + parseInt(moveArea.x);
currentHotBox.style.width = nowW + 'px';
currentHotBox.style.left = offLeft + 'px';
currentHotBox.style.height = nowH + 'px';
currentHotBox.style.top = offTop + 'px';
}
if (initAttr.direct == 'sw') {
var nowH = parseInt(initAttr.height) + parseInt(moveArea.y);
var nowW = parseInt(initAttr.width) - parseInt(moveArea.x);
var offLeft = parseInt(initAttr.left) + parseInt(moveArea.x);
currentHotBox.style.height = nowH + 'px';
currentHotBox.style.width = nowW + 'px';
currentHotBox.style.left = offLeft + 'px';
}
if (initAttr.direct == 'se') {
var nowW = parseInt(initAttr.width) + parseInt(moveArea.x);
var nowH = parseInt(initAttr.height) + parseInt(moveArea.y);
currentHotBox.style.width = nowW + 'px';
currentHotBox.style.height = nowH + 'px';
}
}
}
}
});
document.addEventListener('mouseup', function(e) {
// 是否新增热区
if (addHotFlag) {
// 20可以通过陪参传入
if (parseInt(newHotBox.style.width) < 20 || parseInt(newHotBox.style.height) < 20) {
//console.log(newHotBox);
newHotBox && newHotBox.parentNode.removeChild(newHotBox);
parseInt(newHotBox.style.width) < 20 && console.log('热区宽度太窄了，建议大于20px');
parseInt(newHotBox.style.height) < 20 && console.log('热区高度太小了，建议大于20px');
} else {
boxIdx++;
opt.newcallback && opt.newcallback(newHotBox);
}
}
// 是否拖动热区
if (dragAreaFlag) {
opt.dragareacallback && opt.dragareacallback(currentHotBox);
}
// 是否拖动缩放
if (dragPointFlag) {
opt.dragpointcallback && opt.dragpointcallback(currentHotBox);
}
flag = false;
addHotFlag = false;
dragAreaFlag = false;
dragPointFlag = false;
currentHotBox = null;
newHotBox = null;
start = null;
// 释放拖动事件
document.onmousemove = null;
document.onselectstart = null;
container.ondragstart = null;
});
container.addEventListener('click', function (e) {
var boxCnt = getBoxContent(e.target);
if (boxCnt) {
// 移除其他框的active
removeOtherActive();
boxCnt.parentNode.classList.add('active');
opt.clickcallback && opt.clickcallback(boxCnt.parentNode);
}
});
function removeOtherActive() {
var active = container.querySelector('.hot-crop-box.active');
active && active.classList.remove('active');
}
}
};
return dragarea;
}));