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index.js
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index.js
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// Make the DIV element draggable:
const playground = document.querySelector('#playground');
const playgroundRect = playground.getBoundingClientRect();
const main = document.querySelector('#main');
dragElement(main);
function dragElement(element) {
let pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
document.querySelector('#header').onmousedown = dragMouseDown;
function dragMouseDown(e) {
e = e || window.event;
e.preventDefault();
// get the mouse cursor position at startup:
pos3 = e.clientX;
pos4 = e.clientY;
document.onmouseup = closeDragElement;
// call a function whenever the cursor moves:
document.onmousemove = elementDrag;
}
function elementDrag(e) {
e = e || window.event;
e.preventDefault();
// calculate the new cursor position:
pos1 = pos3 - e.clientX;
pos2 = pos4 - e.clientY;
pos3 = e.clientX;
pos4 = e.clientY;
// set the element's new position:
element.style.top = (element.offsetTop - pos2) + "px";
element.style.left = (element.offsetLeft - pos1) + "px";
if (element.offsetTop < playgroundRect.top) {
element.style.top = playgroundRect.top + "px";
}
if (element.offsetTop + element.offsetHeight > playgroundRect.bottom) {
element.style.top = playgroundRect.bottom - element.offsetHeight + "px";
}
if (element.offsetLeft < playgroundRect.left) {
element.style.left = playgroundRect.left + "px";
}
if (element.offsetLeft + element.offsetWidth > playgroundRect.right) {
element.style.left = playgroundRect.right - element.offsetWidth + "px";
}
}
function closeDragElement() {
// stop moving when mouse button is released:
document.onmouseup = null;
document.onmousemove = null;
}
}
function makeResizableDiv(div) {
const element = document.querySelector(div);
const resizers = document.querySelectorAll(div + ' .resizer')
const minimum_size = 200;
let original_width = 200;
let original_height = 200;
let original_x = 0;
let original_y = 0;
let original_mouse_x = 0;
let original_mouse_y = 0;
for (let i = 0;i < resizers.length; i++) {
const currentResizer = resizers[i];
currentResizer.addEventListener('mousedown', function(e) {
e.preventDefault()
original_width = parseFloat(getComputedStyle(element, null).getPropertyValue('width').replace('px', ''));
original_height = parseFloat(getComputedStyle(element, null).getPropertyValue('height').replace('px', ''));
original_x = element.getBoundingClientRect().left;
original_y = element.getBoundingClientRect().top;
original_mouse_x = e.pageX;
original_mouse_y = e.pageY;
window.addEventListener('mousemove', resize)
window.addEventListener('mouseup', stopResize)
})
function resize(e) {
if (currentResizer.classList.contains('bottom-right')) {
const width = original_width + (e.pageX - original_mouse_x);
const height = original_height + (e.pageY - original_mouse_y);
if (width > minimum_size) {
element.style.width = width + 'px'
}
if (height > minimum_size) {
element.style.height = height + 'px'
}
}
else if (currentResizer.classList.contains('bottom-left')) {
const height = original_height + (e.pageY - original_mouse_y)
const width = original_width - (e.pageX - original_mouse_x)
if (height > minimum_size) {
element.style.height = height + 'px'
}
if (width > minimum_size) {
element.style.width = width + 'px'
element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
}
}
else if (currentResizer.classList.contains('top-right')) {
const width = original_width + (e.pageX - original_mouse_x)
const height = original_height - (e.pageY - original_mouse_y)
if (width > minimum_size) {
element.style.width = width + 'px'
}
if (height > minimum_size) {
element.style.height = height + 'px'
element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
}
}
else if(currentResizer.classList.contains('top-left')) {
const width = original_width - (e.pageX - original_mouse_x)
const height = original_height - (e.pageY - original_mouse_y)
if (width > minimum_size) {
element.style.width = width + 'px'
element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
}
if (height > minimum_size) {
element.style.height = height + 'px'
element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
}
}
else if(currentResizer.classList.contains('left')) {
const width = original_width - (e.pageX - original_mouse_x)
if (width > minimum_size) {
element.style.width = width + 'px'
element.style.left = original_x + (e.pageX - original_mouse_x) + 'px'
}
}
else if(currentResizer.classList.contains('top')) {
const height = original_height - (e.pageY - original_mouse_y)
if (height > minimum_size) {
element.style.height = height + 'px'
element.style.top = original_y + (e.pageY - original_mouse_y) + 'px'
}
}
else if (currentResizer.classList.contains('right')) {
const width = original_width + (e.pageX - original_mouse_x)
if (width > minimum_size) {
element.style.width = width + 'px'
}
}
else if (currentResizer.classList.contains('bottom')) {
const height = original_height + (e.pageY - original_mouse_y)
if (height > minimum_size) {
element.style.height = height + 'px'
}
}
if (element.offsetTop < playgroundRect.top) {
element.style.top = Math.ceil(playgroundRect.top) + "px";
}
if (element.offsetTop + element.offsetHeight > playgroundRect.bottom) {
element.style.top = Math.floor(playgroundRect.bottom - element.offsetHeight) + "px";
}
if (element.offsetLeft < playgroundRect.left) {
element.style.left = Math.ceil(playgroundRect.left) + "px";
}
if (element.offsetLeft + element.offsetWidth > playgroundRect.right) {
element.style.left = Math.floor(playgroundRect.right - element.offsetWidth) + "px";
}
}
function stopResize() {
window.removeEventListener('mousemove', resize)
}
}
}
makeResizableDiv('.resizable')