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const ansi = require('../util/ansi')
const DisplayElement = require('./DisplayElement')
const FocusElement = require('./form/FocusElement')
module.exports = class Root extends DisplayElement {
// An element to be used as the root of a UI. Handles lots of UI and
// socket stuff.
constructor(interfacer) {
super()
this.interfacer = interfacer
this.selectedElement = null
this.cursorBlinkOffset = Date.now()
interfacer.on('inputData', buf => this.handleData(buf))
}
render() {
this.renderTo(this.interfacer)
}
handleData(buffer) {
if (this.selectedElement) {
const els = [
...this.selectedElement.directAncestors, this.selectedElement]
for (const el of els) {
if (el instanceof FocusElement) {
const shouldBreak = (el.keyPressed(buffer) === false)
if (shouldBreak) {
break
}
el.emit('keypressed', buffer)
}
}
}
}
drawTo(writable) {
writable.write(ansi.moveCursor(0, 0))
writable.write(' '.repeat(this.w * this.h))
}
didRenderTo(writable) {
// Render the cursor, based on the cursorX and cursorY of the currently
// selected element.
if (this.selectedElement && this.selectedElement.cursorVisible) {
if ((Date.now() - this.cursorBlinkOffset) % 1000 < 500) {
writable.write(ansi.moveCursor(
this.selectedElement.absCursorY, this.selectedElement.absCursorX))
writable.write(ansi.invert())
writable.write('I')
writable.write(ansi.resetAttributes())
}
writable.write(ansi.showCursor())
writable.write(ansi.moveCursor(
this.selectedElement.absCursorY, this.selectedElement.absCursorX))
} else {
writable.write(ansi.hideCursor())
}
}
cursorMoved() {
// Resets the blinking animation for the cursor. Call this whenever you
// move the cursor.
this.cursorBlinkOffset = Date.now()
}
select(el) {
// Select an element. Calls the unfocus method on the already-selected
// element, if there is one.
const oldSelected = this.selectedElement
const newSelected = el
// Relevant elements that COULD have their "isSelected" state change.
// We ignore elements where isSelected is undefined, because they aren't
// build to handle being selected, and they break the compare-old-and-new-
// state code below.
const relevantElements = [
...(oldSelected ? [...oldSelected.directAncestors, oldSelected] : []),
...(newSelected ? newSelected.directAncestors : [])
].filter(el => typeof el.isSelected !== 'undefined')
const oldStates = relevantElements.map(el => [el, el.isSelected])
this.selectedElement = el
// Same stuff as in the for loop below. We always call selected() on the
// passed element, even if it was already selected before.
if (el.selected) el.selected()
if (typeof el.focused === 'function') el.focused()
if (this.selectedElement !== newSelected) return
// Compare the old "isSelected" state of every relevant element with their
// current "isSelected" state, and call the respective selected/unselected
// functions. (Also call focused and unfocused for some sense of trying to
// not break old programs, but, like, old programs are going to be broken
// anyways.)
for (const [ el, wasSelected ] of oldStates) {
const { isSelected } = el
if (isSelected && !wasSelected) {
if (el.selected) el.selected()
if (typeof el.focused === 'function') el.focused()
} else if (wasSelected && !isSelected) {
if (el.unselected) el.unselected()
if (typeof el.unfocused === 'function') el.unfocused()
}
// If the (un)selected() handler actually selected a different element
// itself, then further processing of new selected states is irrelevant,
// so stop here. (We return instead of breaking the for loop because
// anything after this loop would have already been handled by the call
// to Root.select() from the (un)selected() handler.)
if (this.selectedElement !== newSelected) {
return
}
}
this.cursorMoved()
}
isChildOrSelfSelected(el) {
if (!this.selectedElement) return false
if (this.selectedElement === el) return true
if (this.selectedElement.directAncestors.includes(el)) return true
return false
}
}
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