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| <style>
.square {
width: 50px;
height: 50px;
background-color: blue;
}
.controll-box i {
width: 4px;
height: 4px;
border: 1px solid rgb(6, 123, 239);
background-color: #ffffff;
}
.controll-box i:hover {
background-color: blue;
}
</style>
<body>
<div class="square" style="position: absolute; left: 500px; top: 500px"></div>
<script>
class DragControll {
dragEl = null;
_style = {
top: 0,
left: 0,
width: 0,
height: 0,
};
elBox = null;
tl = null;
tr = null;
bl = null;
br = null;
constructor() {
this.init();
}
init() {
this.elBox = document.createElement("div");
this.elBox.className = "controll-box";
this.elBox.style.display = "none";
this.tl = this._initDragIcon("i", "tl");
this.tr = this._initDragIcon("i", "tr");
this.bl = this._initDragIcon("i", "bl");
this.br = this._initDragIcon("i", "br");
document.body.appendChild(this.elBox);
const _this = this;
document.addEventListener("click", function (e) {
if (!_this.isActive(e)) {
_this.hide();
}
});
}
isActive(e) {
const { clientX, clientY } = e;
const { top, left, width, height } = this._style;
return (
clientX >= left &&
clientX <= left + width &&
clientY >= top &&
clientY <= top + height
);
}
handleClick(dragEl) {
this.dragEl = dragEl;
this.elBox.style.display = "inline-block";
const { top, left, width, height } = dragEl.getBoundingClientRect();
console.log(top, left, width, height);
this.setStyle({
top,
left,
width,
height,
});
}
setStyle(obj) {
console.log(obj);
Object.keys(obj).forEach((k) => {
if (this._style[k] != undefined || this._style[k] != null) {
this._style[k] = obj[k];
}
});
const { width, height, top, left } = this._style;
const iconRect = this.tl.getBoundingClientRect();
console.log(iconRect);
this.elBox.style.display = "inline-block";
this._setIconPostion(
this.tl,
top - iconRect.height / 2,
left - iconRect.width / 2
);
this._setIconPostion(
this.tr,
top - iconRect.height / 2,
left + width - iconRect.width / 2
);
this._setIconPostion(
this.bl,
top + height - iconRect.height / 2,
left - iconRect.width / 2
);
this._setIconPostion(
this.br,
top + height - iconRect.height / 2,
left + width - iconRect.width / 2
);
this._setDragItemStyle({ width, height, top, left });
}
_setIconPostion(el, top, left) {
el.style.top = top + "px";
el.style.left = left + "px";
}
_setDragItemStyle(obj) {
const { width, height, top, left } = obj;
this.dragEl.style.top = top + "px";
this.dragEl.style.left = left + "px";
this.dragEl.style.width = width + "px";
this.dragEl.style.height = height + "px";
}
hide() {
this.elBox.style.display = "none";
}
_initDragIcon(elName, className) {
const el = document.createElement(elName);
el.className = className;
el.style.position = "absolute";
const _this = this;
el.addEventListener("mousedown", function (e) {
e.stopPropagation();
function drag(e) {
_this._dragFn(className, e);
}
function stopDrag() {
document.removeEventListener("mousemove", drag);
document.removeEventListener("mouseup", stopDrag);
}
document.addEventListener("mousemove", drag);
document.addEventListener("mouseup", stopDrag);
});
this.elBox.appendChild(el);
return el;
}
_dragFn(type, e) {
const { clientX, clientY } = e;
const { left, top, width, height } = this._style;
let obj = {};
switch (type) {
case "tl":
if (clientX > left + width || clientY > top + height) return;
obj = {
left: clientX,
top: clientY,
width: width + left - clientX,
height: height + top - clientY,
};
break;
case "tr":
if (clientX < left || clientY > top + height) return;
obj = {
top: clientY,
width: clientX - left,
height: height + top - clientY,
};
break;
case "bl":
if (clientX > left + width || clientY < top) return;
obj = {
left: clientX,
width: width - clientX + left,
height: clientY - top,
};
break;
case "br":
if (clientX < left || clientY < top) return;
obj = {
width: clientX - left,
height: clientY - top,
};
break;
}
this.setStyle(obj);
}
}
const dragControll = new DragControll();
const el = document.querySelector(".square");
el.addEventListener("click", function (e) {
dragControll.handleClick(this);
});
</script>
</body>
|
