import { EditorSelection, Prec } from '@codemirror/state' import { EditorView, layer } from '@codemirror/view' import { rectangleMarkerForRange } from '../utils/layer' import { updateHasMouseDownEffect } from './visual/selection' import browser from './browser' /** * The built-in extension which draws the cursor and selection(s) in layers, * copied to make use of a custom version of rectangleMarkerForRange which calls * fullHeightCoordsAtPos when in Source mode, extending the top and bottom * of the coords to cover the full line height. */ export const drawSelection = () => { return [cursorLayer, selectionLayer, hideNativeSelection] } const canHidePrimary = !browser.ios const hideNativeSelection = Prec.highest( EditorView.theme({ '.cm-line': { 'caret-color': canHidePrimary ? 'transparent !important' : null, '& ::selection': { backgroundColor: 'transparent !important', }, '&::selection': { backgroundColor: 'transparent !important', }, }, }) ) const cursorLayer = layer({ above: true, markers(view) { const { selection: { ranges, main }, } = view.state const cursors = [] for (const range of ranges) { const primary = range === main if (!range.empty || !primary || canHidePrimary) { const className = primary ? 'cm-cursor cm-cursor-primary' : 'cm-cursor cm-cursor-secondary' const cursor = range.empty ? range : EditorSelection.cursor( range.head, range.head > range.anchor ? -1 : 1 ) for (const piece of rectangleMarkerForRange(view, className, cursor)) { cursors.push(piece) } } } return cursors }, update(update, dom) { if (update.transactions.some(tr => tr.selection)) { dom.style.animationName = dom.style.animationName === 'cm-blink' ? 'cm-blink2' : 'cm-blink' } return ( update.docChanged || update.selectionSet || updateHasMouseDownEffect(update) ) }, mount(dom, view) { dom.style.animationDuration = '1200ms' }, class: 'cm-cursorLayer', }) const selectionLayer = layer({ above: false, markers(view) { const markers = [] for (const range of view.state.selection.ranges) { if (!range.empty) { markers.push( ...rectangleMarkerForRange(view, 'cm-selectionBackground', range) ) } } return markers }, update(update, dom) { return ( update.docChanged || update.selectionSet || update.viewportChanged || updateHasMouseDownEffect(update) ) }, class: 'cm-selectionLayer', })