feat(Textarea): new component (#62)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

src/runtime/components/Textarea.vue

@@ -0,0 +1,175 @@
+<script lang="ts">
+import { tv, type VariantProps } from 'tailwind-variants'
+import type { AppConfig } from '@nuxt/schema'
+import _appConfig from '#build/app.config'
+import theme from '#build/ui/textarea'
+import { looseToNumber } from '#ui/utils'
+
+const appConfig = _appConfig as AppConfig & { ui: { textarea: Partial<typeof theme> } }
+
+const textarea = tv({ extend: tv(theme), ...(appConfig.ui?.textarea || {}) })
+
+type TextareaVariants = VariantProps<typeof textarea>
+
+export interface TextareaProps {
+  id?: string
+  name?: string
+  placeholder?: string
+  color?: TextareaVariants['color']
+  variant?: TextareaVariants['variant']
+  size?: TextareaVariants['size']
+  required?: boolean
+  autofocus?: boolean
+  autofocusDelay?: number
+  disabled?: boolean
+  class?: any
+  rows?: number
+  maxrows?: number
+  autoresize?: boolean
+  ui?: Partial<typeof textarea.slots>
+}
+export interface TextareaEmits {
+  (e: 'blur', event: FocusEvent): void
+}
+
+export interface TextareaSlots {
+  default(): any
+}
+</script>
+
+<script lang="ts" setup>
+import { ref, computed, onMounted, nextTick, watch } from 'vue'
+import { useFormField } from '#ui/composables/useFormField'
+
+defineOptions({ inheritAttrs: false })
+
+const props = withDefaults(defineProps<TextareaProps>(), {
+  rows: 3,
+  maxrows: 0,
+  autofocusDelay: 100
+})
+
+const emit = defineEmits<TextareaEmits>()
+defineSlots<TextareaSlots>()
+
+const [modelValue, modelModifiers] = defineModel<string | number>()
+
+const { emitFormBlur, emitFormInput, size, color, inputId, name, disabled } = useFormField<TextareaProps>(props)
+
+const ui = computed(() => tv({ extend: textarea, slots: props.ui })({
+  color: color.value,
+  variant: props.variant,
+  size: size?.value
+}))
+
+
+const inputRef = ref<HTMLTextAreaElement | null>(null)
+
+function autoFocus () {
+  if (props.autofocus) {
+    inputRef.value?.focus()
+  }
+}
+
+// Custom function to handle the v-model properties
+function updateInput (value: string) {
+  if (modelModifiers.trim) {
+    value = value.trim()
+  }
+
+  if (modelModifiers.number) {
+    value = looseToNumber(value)
+  }
+
+  modelValue.value = value
+  emitFormInput()
+}
+
+function onInput (event: Event) {
+  autoResize()
+
+  if (!modelModifiers.lazy) {
+    updateInput((event.target as HTMLInputElement).value)
+  }
+}
+
+function onChange (event: Event) {
+  const value = (event.target as HTMLInputElement).value
+
+  if (modelModifiers.lazy) {
+    updateInput(value)
+  }
+
+  // Update trimmed textarea so that it has same behavior as native textarea https://github.com/vuejs/core/blob/5ea8a8a4fab4e19a71e123e4d27d051f5e927172/packages/runtime-dom/src/directives/vModel.ts#L63
+  if (modelModifiers.trim) {
+    (event.target as HTMLInputElement).value = value.trim()
+  }
+}
+
+function onBlur (event: FocusEvent) {
+  emitFormBlur()
+  emit('blur', event)
+}
+
+onMounted(() => {
+  setTimeout(() => {
+    autoFocus()
+  }, props.autofocusDelay)
+})
+
+const autoResize = () => {
+  if (props.autoresize) {
+
+    if (!inputRef.value) {
+      return
+    }
+
+    inputRef.value.rows = props.rows
+
+    const styles = window.getComputedStyle(inputRef.value)
+    const paddingTop = parseInt(styles.paddingTop)
+    const paddingBottom = parseInt(styles.paddingBottom)
+    const padding = paddingTop + paddingBottom
+    const lineHeight = parseInt(styles.lineHeight)
+    const { scrollHeight } = inputRef.value
+    const newRows = (scrollHeight - padding) / lineHeight
+
+    if (newRows > props.rows) {
+      inputRef.value.rows = props.maxrows ? Math.min(newRows, props.maxrows) : newRows
+    }
+  }
+}
+
+
+watch(() => modelValue, () => {
+  nextTick(autoResize)
+})
+
+onMounted(() => {
+  setTimeout(() => {
+    autoResize()
+  }, 100)
+})
+</script>
+
+<template>
+  <div :class="ui.root({ class: props.class })">
+    <textarea
+      :id="inputId"
+      ref="inputRef"
+      :value="modelValue"
+      :name="name"
+      :rows="rows"
+      :placeholder="placeholder"
+      :class="ui.base()"
+      :disabled="disabled"
+      :required="required"
+      v-bind="$attrs"
+      @input="onInput"
+      @blur="onBlur"
+      @change="onChange"
+    />
+
+    <slot />
+  </div>
+</template>

src/theme/index.ts

@@ -20,3 +20,4 @@ export { default as slideover } from './slideover'
 export { default as switch } from './switch'
 export { default as tabs } from './tabs'
 export { default as tooltip } from './tooltip'
+export { default as textarea } from './textarea'

src/theme/textarea.ts

@@ -0,0 +1,63 @@
+export default (config: { colors: string[] }) => ({
+  slots: {
+    root: 'relative',
+    base: 'relative block w-full disabled:cursor-not-allowed disabled:opacity-75 focus:outline-none border-0 rounded-md placeholder-gray-400 dark:placeholder-gray-500'
+  },
+
+  variants: {
+    size: {
+      '2xs': {
+        base: 'text-xs gap-x-1 px-2 py-1'
+      },
+      xs: {
+        base: 'text-sm gap-x-1.5 px-2.5 py-1.5'
+      },
+      sm: {
+        base: 'text-sm gap-x-1.5 px-2.5 py-1.5'
+      },
+      md: {
+        base: 'text-sm gap-x-1.5 px-3 py-2'
+      },
+      lg: {
+        base: 'text-sm gap-x-2.5 px-3.5 py-2.5'
+      },
+      xl: {
+        base: 'text-base gap-x-2.5 px-3.5 py-2.5'
+      }
+    },
+
+    variant: {
+      outline: '',
+      none: 'bg-transparent focus:ring-0 focus:shadow-none'
+    },
+
+    color: {
+      ...Object.fromEntries(config.colors.map((color: string) => [color, ''])),
+      white: '',
+      gray: ''
+    }
+
+  },
+
+  compoundVariants: [
+    ...config.colors.map((color: string) => ({
+      color,
+      variant: 'outline',
+      class: `shadow-sm bg-transparent text-gray-900 dark:text-white ring ring-inset ring-${color}-500 dark:ring-${color}-400 focus:ring-2 focus:ring-${color}-500 dark:focus:ring-${color}-400`
+    })), {
+      color: 'white',
+      variant: 'outline',
+      class: 'shadow-sm bg-white dark:bg-gray-900 text-gray-900 dark:text-white ring ring-inset ring-gray-300 dark:ring-gray-700 focus:ring-2 focus:ring-primary-500 dark:focus:ring-primary-400'
+    }, {
+      color: 'gray',
+      variant: 'outline',
+      class: 'shadow-sm bg-gray-50 dark:bg-gray-800 text-gray-900 dark:text-white ring ring-inset ring-gray-300 dark:ring-gray-700 focus:ring-2 focus:ring-primary-500 dark:focus:ring-primary-400'
+    }
+  ],
+
+  defaultVariants: {
+    size: 'sm',
+    color: 'white',
+    variant: 'outline'
+  }
+})