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May 15, 2021 22:34
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import Yoga from 'yoga-layout-prebuilt'; | |
import { useEffect, useRef } from 'react'; | |
import { useStdin, useStdout, useApp } from 'ink'; | |
import { Program } from 'blessed'; | |
// TODO: yogaNode.getComputedLayout() returns all 0s except | |
// for the width and height, which means we have to manually | |
// track the positions of elements in the code below. I'm | |
// not sure why this is, but it probably needs some sort of | |
// upstream fix in Ink. | |
function capture(node, event, held, offsetX = 0, offsetY = 0) { | |
const { yogaNode, childNodes } = node; | |
if (!yogaNode) { | |
return false; | |
} | |
if (yogaNode.getDisplay() === Yoga.DISPLAY_NONE) { | |
return false; | |
} | |
const nodeX = offsetX + yogaNode.getComputedLeft(); | |
if (event.x < nodeX) { | |
return false; | |
} | |
const nodeY = offsetY + yogaNode.getComputedTop(); | |
if (event.y < nodeY) { | |
return false; | |
} | |
if (event.x >= nodeX + yogaNode.getComputedWidth()) { | |
return false; | |
} | |
if (event.y >= nodeY + yogaNode.getComputedHeight()) { | |
return false; | |
} | |
switch (event.action) { | |
case 'mousedown': | |
held.add(node); | |
break; | |
case 'mouseup': | |
if (held.has(node)) { | |
if (node.attributes.onClick?.()) { | |
return true; | |
} | |
} | |
break; | |
case 'wheeldown': | |
case 'wheelup': | |
if (node.attributes.onScroll?.()) { | |
return true; | |
} | |
break; | |
default: | |
break; | |
} | |
for (const c of childNodes) { | |
if (capture(c, event, held, nodeX, nodeY)) { | |
return true; | |
} | |
} | |
return false; | |
} | |
export function useInput(rootRef) { | |
const { stdin } = useStdin(); | |
const { stdout } = useStdout(); | |
const { exit } = useApp(); | |
const { current: state } = useRef({ | |
mouseDown: false, | |
held: new Set(), | |
}); | |
useEffect(() => { | |
const program = new Program({ | |
input: stdin, | |
output: stdout, | |
}); | |
program.enableMouse(); | |
program.on('mouse', (event) => { | |
if (!rootRef.current) { | |
return; | |
} | |
// normalize mousemove while held down | |
if (event.action === 'mousedown' && state.mouseDown) { | |
event.action = 'mousemove'; | |
} | |
switch (event.action) { | |
case 'mousedown': | |
state.mouseDown = true; | |
break; | |
case 'mouseup': | |
state.mouseDown = false; | |
break; | |
case 'wheelup': | |
case 'wheeldown': | |
break; | |
case 'mousemove': | |
return; | |
default: | |
throw new RangeError(event.action); | |
} | |
capture(rootRef.current, event, state.held); | |
if (event.action === 'mouseup') { | |
state.held.clear(); | |
} | |
}); | |
program.on('keypress', (key, event) => { | |
if (event.ctrl && event.name === 'c') { | |
program.destroy(); | |
process.nextTick(() => { | |
process.exit(0); | |
}); | |
} | |
}); | |
return () => program.destroy(); | |
}, [stdin, stdout, exit]); | |
} |
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