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desktop.js
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desktop.js
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/* ICON MANAGEMENT */
class DesktopManager {
constructor() {
window.addEventListener('load', this.resizeSelectionCanvas.bind(this))
window.addEventListener('resize', this.resizeSelectionCanvas.bind(this))
window.addEventListener('orientationchange', this.resizeSelectionCanvas.bind(this))
this.desktop = document.querySelector('.desktop')
this.desktop_container = document.querySelector('.desktop-container')
// attach icon behaviors
this.desktop
.querySelectorAll('.desktop-icon')
.forEach(icon => {
this.attachIconSelection(icon)
})
document.querySelector('.desktop')
.addEventListener('click', this.handleClick.bind(this))
this.canvas = document.querySelector('canvas#selections')
this.sel_ctx = this.canvas.getContext('2d')
this.drawing_selection = false
this.skip_click = false
this.resizeSelectionCanvas()
// attach selection events
window.mm.addMouseupListener(() => this.handleSelectionEnd())
if (isMobileBrowser()) {
this.desktop_container
.addEventListener('touchstart', this.handleSelectionStart.bind(this))
this.desktop_container
.addEventListener('touchend', this.handleSelectionEnd.bind(this))
} else {
this.desktop_container
.addEventListener('pointerdown', this.handleSelectionStart.bind(this))
this.desktop_container
.addEventListener('pointerup', this.handleSelectionEnd.bind(this))
}
// taskbar quick
document.querySelectorAll('.task-bar__quick[data-launch]')
.forEach(el => {
el.addEventListener('click', () => window.pm.createInstance(el.dataset.launch))
})
}
attachIconSelection(icon) {
icon.addEventListener('click', () => {
document.querySelector('.desktop')
.querySelectorAll('.desktop-icon[data-active="true"]')
.forEach(el => el.dataset.active = false)
icon.dataset.active = true
})
const openProgram = e => {
e.preventDefault()
if ('launch' in icon.dataset) {
window.pm.createInstance(icon.dataset.launch)
} else {
window.wm.openWindow({title: 'Sorry!'}, `
<p>It doesn't work.</p>
`)
}
}
icon.addEventListener('dblclick', openProgram)
if (isMobileBrowser()) {
// on mobile, fire this on a single click
icon.addEventListener('click', openProgram)
}
}
clearIconSelections() {
document.querySelector('.desktop')
.querySelectorAll('.desktop-icon[data-active="true"]')
.forEach(el => el.dataset.active = false)
}
handleClick(e) {
// ensure that we're not firing a click after a selection event
if (this.skip_click === true) {
this.skip_click = false
return
}
let assertNotIcon = target => {
if (target === document.body) return true
if (target.classList.contains('desktop-icon')) return false
return assertNotIcon(target.parentNode)
}
if (!assertNotIcon(e.target)) return
this.clearIconSelections()
}
checkIconOverlap(icon, x1, y1, x2, y2) {
let rect = icon.getBoundingClientRect()
/*
* Conditions for missing an overlap:
* - top edge of sel box is below bottom edge of icon
* - left edge of sel box is past right edge of icon
* - right edge of sel box is past left edge of icon
* - bottom edge of sel box is above top edge of icon
*/
let i_x1 = rect.x * window.devicePixelRatio
let i_y1 = rect.y * window.devicePixelRatio
let i_x2 = (rect.x + rect.width ) * window.devicePixelRatio
let i_y2 = (rect.y + rect.height) * window.devicePixelRatio
if (!(Math.min(y1,y2) > i_y2 ||
Math.max(y1,y2) < i_y1) &&
!(Math.min(x1,x2) > i_x2 ||
Math.max(x1,x2) < i_x1)
) {
return true
}
return false
}
resizeSelectionCanvas() {
const canvas = document.querySelector('canvas#selections')
const taskbarHeight = document
.querySelector('.task-bar')
.getBoundingClientRect()
.height
// get the naive sizing
let canvas_width = window.innerWidth
let canvas_height = window.innerHeight - taskbarHeight
// first set the canvas dom element size
canvas.style.height = `${canvas_height}px`
canvas.style.width = `${canvas_width}px`
// fix the dpi scaling
let dpi = window.devicePixelRatio
canvas.setAttribute('width', canvas_width * dpi)
canvas.setAttribute('height', canvas_height * dpi)
this.canvas_size = {
width: canvas_width * dpi,
height: canvas_height * dpi
}
}
clearSelectionRect() {
// clear a rectangle the size of the canvas
this.sel_ctx.clearRect(0,0,this.canvas_size.width,this.canvas_size.height)
}
drawSelectionRect(x1, y1, x2, y2) {
// scale dpi to match screen pixels to canvas pixels
let dpi = window.devicePixelRatio
x1 *= dpi
y1 *= dpi
x2 *= dpi
y2 *= dpi
// clear the previous one (if any)
this.clearSelectionRect()
// begin draw
this.sel_ctx.beginPath()
this.sel_ctx.lineWidth = '1px'
this.sel_ctx.strokeStyle = 'red'
this.sel_ctx.setLineDash([1])
// x, y, width, height
this.sel_ctx.rect(x1, y1, x2 - x1, y2 - y1)
this.sel_ctx.stroke()
for (let icon of this.desktop.querySelectorAll('.desktop-icon')) {
if (this.checkIconOverlap(icon, x1, y1, x2, y2)) {
icon.dataset.active = true
} else {
icon.dataset.active = false
}
}
}
handleSelectionStart(e) {
window.mm.updateMousePos(e)
this.drawing_selection = true
this.initial_selection_start = {
x: window.mouse.x,
y: window.mouse.y
}
const updateSelection = () => {
// conditional hoisted to not break clicking/dblclicking
if (this.drawing_selection) {
this.skip_click = true
this.drawSelectionRect(
this.initial_selection_start.x,
this.initial_selection_start.y,
window.mouse.x,
window.mouse.y
)
window.requestAnimationFrame(updateSelection)
}
}
setTimeout(updateSelection, 250)
}
handleSelectionEnd(e) {
this.drawing_selection = false
this.clearSelectionRect()
// hacky, but this keeps the selections from instantly disappearing
setTimeout(() => this.skip_click = false, 100)
}
}
window.dm = new DesktopManager()