overleaf/services/web/frontend/js/features/source-editor/extensions/scroll-one-line.ts

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import { Command, EditorView } from '@codemirror/view'
function scrollByLine(view: EditorView, lineCount: number) {
view.scrollDOM.scrollTop += view.defaultLineHeight * lineCount
}
const scrollUpOneLine: Command = (view: EditorView) => {
scrollByLine(view, -1)
// Always consume the keypress to prevent the cursor going up a line when the
// editor is scrolled to the top
return true
}
const scrollDownOneLine: Command = (view: EditorView) => {
scrollByLine(view, 1)
// Always consume the keypress to prevent the cursor going down a line when
// the editor is scrolled to the bottom
return true
}
// Applied to Windows and Linux only
export const scrollOneLineKeymap = [
{
linux: 'Ctrl-ArrowUp',
win: 'Ctrl-ArrowUp',
run: scrollUpOneLine,
},
{
linux: 'Ctrl-ArrowDown',
win: 'Ctrl-ArrowDown',
run: scrollDownOneLine,
},
]