| 1 | import type { Brush, Options as DrauuOptions, DrawingMode } from 'drauu' |
| 2 | import { createSharedComposable, useLocalStorage } from '@vueuse/core' |
| 3 | import { createDrauu } from 'drauu' |
| 4 | import { computed, markRaw, nextTick, reactive, ref, watch } from 'vue' |
| 5 | import { configs } from '../env' |
| 6 | import { isInputting } from '../state' |
| 7 | import { drawingState, onPatchDrawingState, patchDrawingState } from '../state/drawings' |
| 8 | import { useNav } from './useNav' |
| 9 | |
| 10 | export const useDrawings = createSharedComposable(() => { |
| 11 | const { currentSlideNo, isPresenter } = useNav() |
| 12 | |
| 13 | const brushColors = [ |
| 14 | '#ff595e', |
| 15 | '#ffca3a', |
| 16 | '#8ac926', |
| 17 | '#1982c4', |
| 18 | '#6a4c93', |
| 19 | '#ffffff', |
| 20 | '#000000', |
| 21 | ] |
| 22 | |
| 23 | const drawingEnabled = useLocalStorage('slidev-drawing-enabled', false) |
| 24 | const drawingPinned = useLocalStorage('slidev-drawing-pinned', false) |
| 25 | const brush = useLocalStorage<Brush>('slidev-drawing-brush', { |
| 26 | color: brushColors[0], |
| 27 | size: 4, |
| 28 | mode: 'stylus', |
| 29 | }) |
| 30 | |
| 31 | const isDrawing = ref(false) |
| 32 | const canUndo = ref(false) |
| 33 | const canRedo = ref(false) |
| 34 | const canClear = ref(false) |
| 35 | |
| 36 | const _mode = ref<DrawingMode | 'arrow'>('stylus') |
| 37 | const syncUp = computed(() => configs.drawings.syncAll || isPresenter.value) |
| 38 | let disableDump = false |
| 39 | |
| 40 | const drawingMode = computed({ |
| 41 | get() { |
| 42 | return _mode.value |
| 43 | }, |
| 44 | set(v: DrawingMode | 'arrow') { |
| 45 | _mode.value = v |
| 46 | if (v === 'arrow') { |
| 47 | // eslint-disable-next-line ts/no-use-before-define |
| 48 | drauu.mode = 'line' |
| 49 | brush.value.arrowEnd = true |
| 50 | } |
| 51 | else { |
| 52 | // eslint-disable-next-line ts/no-use-before-define |
| 53 | drauu.mode = v |
| 54 | brush.value.arrowEnd = false |
| 55 | } |
| 56 | }, |
| 57 | }) |
| 58 | |
| 59 | const drauuOptions: DrauuOptions = reactive({ |
| 60 | brush, |
| 61 | acceptsInputTypes: computed(() => (drawingEnabled.value && (!configs.drawings.presenterOnly || isPresenter.value)) ? undefined : ['pen' as const]), |
| 62 | coordinateTransform: false, |
| 63 | }) |
| 64 | |
| 65 | const drauu = markRaw(createDrauu(drauuOptions)) |
| 66 | |
| 67 | function clearDrauu() { |
| 68 | drauu.clear() |
| 69 | if (syncUp.value) |
| 70 | patchDrawingState(currentSlideNo.value, '') |
| 71 | } |
| 72 | |
| 73 | function updateState() { |
| 74 | canRedo.value = drauu.canRedo() |
| 75 | canUndo.value = drauu.canUndo() |
| 76 | canClear.value = !!drauu.el?.children.length |
| 77 | } |
| 78 | |
| 79 | function loadCanvas(page?: number) { |
| 80 | disableDump = true |
| 81 | const data = drawingState[page || currentSlideNo.value] |
| 82 | if (data != null) |
| 83 | drauu.load(data) |
| 84 | else |
| 85 | drauu.clear() |
| 86 | updateState() |
| 87 | disableDump = false |
| 88 | } |
| 89 | |
| 90 | drauu.on('changed', () => { |
| 91 | updateState() |
| 92 | if (!disableDump) { |
| 93 | const dump = drauu.dump() |
| 94 | const key = currentSlideNo.value |
| 95 | if ((drawingState[key] || '') !== dump && syncUp.value) |
| 96 | patchDrawingState(key, drauu.dump()) |
| 97 | } |
| 98 | }) |
| 99 | |
| 100 | onPatchDrawingState((state) => { |
| 101 | disableDump = true |
| 102 | if (state[currentSlideNo.value] != null) |
| 103 | drauu.load(state[currentSlideNo.value] || '') |
| 104 | disableDump = false |
| 105 | updateState() |
| 106 | }) |
| 107 | |
| 108 | nextTick(() => { |
| 109 | watch(currentSlideNo, () => { |
| 110 | if (!drauu.mounted) |
| 111 | return |
| 112 | loadCanvas() |
| 113 | }, { immediate: true }) |
| 114 | }) |
| 115 | |
| 116 | drauu.on('start', () => isDrawing.value = true) |
| 117 | drauu.on('end', () => isDrawing.value = false) |
| 118 | |
| 119 | window.addEventListener('keydown', (e) => { |
| 120 | if (!drawingEnabled.value || isInputting.value) |
| 121 | return |
| 122 | |
| 123 | const noModifier = !e.ctrlKey && !e.altKey && !e.shiftKey && !e.metaKey |
| 124 | let handled = true |
| 125 | if (e.code === 'KeyZ' && (e.ctrlKey || e.metaKey)) { |
| 126 | if (e.shiftKey) |
| 127 | drauu.redo() |
| 128 | else |
| 129 | drauu.undo() |
| 130 | } |
| 131 | else if (e.code === 'Escape') { |
| 132 | drawingEnabled.value = false |
| 133 | } |
| 134 | else if (e.code === 'KeyL' && noModifier) { |
| 135 | drawingMode.value = 'line' |
| 136 | } |
| 137 | else if (e.code === 'KeyA' && noModifier) { |
| 138 | drawingMode.value = 'arrow' |
| 139 | } |
| 140 | else if (e.code === 'KeyS' && noModifier) { |
| 141 | drawingMode.value = 'stylus' |
| 142 | } |
| 143 | else if (e.code === 'KeyR' && noModifier) { |
| 144 | drawingMode.value = 'rectangle' |
| 145 | } |
| 146 | else if (e.code === 'KeyE' && noModifier) { |
| 147 | drawingMode.value = 'ellipse' |
| 148 | } |
| 149 | else if (e.code === 'KeyC' && noModifier) { |
| 150 | clearDrauu() |
| 151 | } |
| 152 | else if (e.code.startsWith('Digit') && noModifier && +e.code[5] <= brushColors.length) { |
| 153 | brush.value.color = brushColors[+e.code[5] - 1] |
| 154 | } |
| 155 | else { |
| 156 | handled = false |
| 157 | } |
| 158 | |
| 159 | if (handled) { |
| 160 | e.preventDefault() |
| 161 | e.stopPropagation() |
| 162 | } |
| 163 | }, false) |
| 164 | |
| 165 | return { |
| 166 | brush, |
| 167 | brushColors, |
| 168 | canClear, |
| 169 | canRedo, |
| 170 | canUndo, |
| 171 | clear: clearDrauu, |
| 172 | drauu, |
| 173 | drauuOptions, |
| 174 | drawingEnabled, |
| 175 | drawingMode, |
| 176 | drawingPinned, |
| 177 | drawingState, |
| 178 | isDrawing, |
| 179 | loadCanvas, |
| 180 | } |
| 181 | }) |
| 182 |