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>