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import PlainDraggable from 'plain-draggable'
import { onRemove, animateRectTransition } from './utils'
export class Layout {
constructor(options = {}) {
if (!options.name) throw Error("Layout name is not given")
this.name = options.name
this.enterHandler = options.enterHandler
this.leaveHandler = options.leaveHandler
}
valueOf = () => this.name
}
export class SideBySide extends Layout {
name = "side-by-side"
enterHandler = ({ container, htmlHolder, showcase }) => {
const bar = document.createElement('div')
bar.className = 'bar'
bar.innerHTML = '<div class="bar-handle"></div>'
const handle = bar.querySelector('.bar-handle')
container.appendChild(bar)
// Resize views by value
const resizeByLeft = (left) => {
htmlHolder.style.width = (left) + "px"
showcase.style.width = (parseFloat(getComputedStyle(container).width) - left) + "px"
}
const draggable = new PlainDraggable(bar, {
handle: handle,
containment: { left: '25%', top: 0, right: '75%', height: 0 },
})
draggable.draggableCursor = "grab"
draggable.onDrag = (pos) => {
handle.style.transform = 'unset'
resizeByLeft(pos.left)
}
draggable.onDragEnd = (_) => {
handle.removeAttribute('style')
}
onRemove(bar, () => draggable.remove())
}
leaveHandler = ({ container }) => {
container.querySelector('.bar')?.remove()
}
}
export class Overlay extends Layout {
name = "overlay"
saveLeftTopAsData = (element) => {
const { left, top } = element.getBoundingClientRect()
element.setAttribute('data-left', left)
element.setAttribute('data-top', top)
}
addDraggable = (element) => {
// Make sure current element always on top
const siblings = Array.from(element.parentElement?.querySelectorAll(':scope > *') ?? [])
element.onmouseover = () => {
siblings.forEach(e => e.style.removeProperty('z-index'))
element.style.zIndex = '9000'
}
// Add draggable part
const draggablePart = document.createElement('div')
element.appendChild(draggablePart)
draggablePart.className = 'draggable-part'
draggablePart.innerHTML = '<div class="handle">\u2630</div>'
draggablePart.title = 'Use middle-click to remove block'
draggablePart.onmouseup = (e) => {
// Hide block with middle click
if (e.button === 1) {
element.classList.add('hide')
}
}
// Add draggable instance
const { left, top } = element.getBoundingClientRect()
const draggable = new PlainDraggable(element, {
top: top,
left: left,
handle: draggablePart,
snap: { x: { step: 20 }, y: { step: 20 } },
})
// FIXME use pure CSS to hide utils
const utils = element.querySelector('.utils')
draggable.onDragStart = () => {
utils.style.display = 'none'
element.classList.add('drag')
}
draggable.onDragEnd = () => {
utils.style = ''
element.classList.remove('drag')
element.style.zIndex = '9000'
}
// Reposition draggable instance when resized
new ResizeObserver(() => {
try {
draggable.position();
} catch (_) {
null
}
}).observe(element);
// Callback for remove
onRemove(element, () => {
draggable.remove()
})
}
enterHandler = ({ htmlHolder, blocks }) => {
// FIXME It is weird rect from this method and this scope are different...
blocks.forEach(this.saveLeftTopAsData)
// Create draggable blocks and set each position by previous one
let [left, top] = [20, 20]
blocks.forEach(block => {
const originLeft = Number(block.getAttribute('data-left'))
const originTop = Number(block.getAttribute('data-top'))
// Create draggable block
const wrapper = document.createElement('div')
wrapper.classList.add('draggable-block')
wrapper.innerHTML = `
<div class="utils">
<div id="close">\u274C</div>
<div id="plus-font-size" ">\u2795</div>
<div id="minus-font-size">\u2796</div>
</div>
`
wrapper.appendChild(block)
htmlHolder.appendChild(wrapper)
wrapper.style.left = left + "px"
wrapper.style.top = top + "px"
const { width } = wrapper.getBoundingClientRect()
left += width + 30
if (left > window.innerWidth) {
top += 200
left = left % window.innerWidth
}
animateRectTransition(
wrapper,
{ left: originLeft, top: originTop },
{ resume: true, duration: 500 }
)
.finished
.finally(() => this.addDraggable(wrapper))
// Trivial case:
// This hack make sure utils remains at the same place even when wrapper resized
// Prevent DOMRect changes when user clicking plus/minus button many times
const utils = wrapper.querySelector('.utils')
utils.onmouseover = () => {
const { left, top } = utils.getBoundingClientRect()
utils.style.cssText = `visibility: visible; z-index: 9000; position: fixed; transition: unset; left: ${left}px; top: ${top}px;`
document.body.appendChild(utils)
}
utils.onmouseout = () => {
wrapper.appendChild(utils)
utils.removeAttribute('style')
}
// Close button
wrapper.querySelector('#close').onclick = () => {
wrapper.classList.add('hide')
utils.removeAttribute('style')
}
// Plus/Minus font-size of content
wrapper.querySelector('#plus-font-size').onclick = () => {
const fontSize = parseFloat(getComputedStyle(block).fontSize) / 16
block.style.fontSize = `${fontSize + 0.2}rem`
}
wrapper.querySelector('#minus-font-size').onclick = () => {
const fontSize = parseFloat(getComputedStyle(block).fontSize) / 16
block.style.fontSize = `${fontSize - 0.2}rem`
}
})
}
leaveHandler = ({ htmlHolder, blocks }) => {
const resumeFromDraggable = (block) => {
const draggableContainer = block.closest('.draggable-block')
if (!draggableContainer) return
htmlHolder.appendChild(block)
draggableContainer.remove()
}
blocks.forEach(resumeFromDraggable)
}
}
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