feat(Modal): open programmatically (#1319)

docs/app.vue

@@ -20,6 +20,7 @@
         <span v-html="title" />
       </template>
     </UNotifications>
+    <UModals />
   </div>
 </template>
 

docs/components/content/examples/ModalExampleComponent.vue

@@ -0,0 +1,17 @@
+<script lang="ts" setup>
+defineProps({
+  count: {
+    type: Number,
+    default: 0
+  }
+})
+</script>
+
+<template>
+  <UModal>
+    <UCard>
+      <p>This modal was opened programmatically !</p>
+      <p>Count: {{ count }}</p>
+    </UCard>
+  </UModal>
+</template>

docs/components/content/examples/ModalExampleComposable.vue

@@ -0,0 +1,17 @@
+<script setup lang="ts">
+import { ModalExampleComponent } from '#components'
+
+const modal = useModal()
+const count = ref(0)
+
+function openModal () {
+  count.value += 1
+  modal.open(ModalExampleComponent, {
+    count: count.value
+  })
+}
+</script>
+
+<template>
+  <UButton label="Reveal modal" @click="openModal" />
+</template>

docs/content/2.components/modal.md

@@ -59,6 +59,26 @@ Set the `fullscreen` prop to `true` to enable it.
 
 :component-example{component="modal-example-fullscreen"}
 
+### Control programmatically
+
+First of all, add the `Modals` component to your app, preferably inside `app.vue`.
+
+```vue [app.vue]
+<template>
+  <div>
+    <UContainer>
+      <NuxtPage />
+    </UContainer>
+
+    <UModals />
+  </div>
+</template>
+```
+
+Then, you can use the `useModal` composable to control your modals within your app.
+
+:component-example{component="modal-example-composable"}
+
 ## Props
 
 :component-props

src/module.ts

@@ -90,6 +90,10 @@ export default defineNuxtModule<ModuleOptions>({
       src: resolve(runtimeDir, 'plugins', 'colors')
     })
 
+    addPlugin({
+      src: resolve(runtimeDir, 'plugins', 'modals')
+    })
+
     // Components
 
     addComponentsDir({

src/runtime/components/overlays/Modals.vue

@@ -0,0 +1,12 @@
+<template>
+  <component :is="modalState.component" v-bind="modalState.props" v-model="isOpen" />
+</template>
+
+<script lang="ts" setup>
+import { inject } from 'vue'
+import { useModal, modalInjectionKey } from '../../composables/useModal'
+
+const modalState = inject(modalInjectionKey)
+
+const { isOpen } = useModal()
+</script>

src/runtime/composables/useModal.ts

@@ -0,0 +1,51 @@
+import { ref, inject } from 'vue'
+import type { ShallowRef, Component, InjectionKey } from 'vue'
+import { createSharedComposable } from '@vueuse/core'
+import type { ComponentProps } from '../types/component'
+import type { Modal, ModalState } from '../types/modal'
+
+export const modalInjectionKey: InjectionKey<ShallowRef<ModalState>> = Symbol('nuxt-ui.modal')
+
+function _useModal () {
+  const modalState = inject(modalInjectionKey)
+  
+  const isOpen = ref(false)
+
+  function open<T extends Component> (component: T, props?: Modal & ComponentProps<T>) {
+    modalState.value = {
+      component,
+      props: props ?? {}
+    }
+    isOpen.value = true
+  }
+
+  function close () {
+    isOpen.value = false
+    modalState.value = {
+      component: 'div',
+      props: {}
+    }
+  }
+
+  /**
+   * Allows updating the modal props
+   */
+  function patch <T extends Component = {}> (props: Partial<Modal & ComponentProps<T>>) {
+    modalState.value = {
+      ...modalState.value,
+      props: {
+        ...modalState.value.props,
+        ...props
+      }
+    }
+  }
+
+  return {
+    isOpen,
+    open,
+    close,
+    patch
+  }
+}
+
+export const useModal = createSharedComposable(_useModal)

src/runtime/plugins/modals.ts

@@ -0,0 +1,13 @@
+import { defineNuxtPlugin } from '#imports'
+import { shallowRef } from 'vue'
+import { modalInjectionKey } from '../composables/useModal'
+import type { ModalState } from '../types/modal'
+
+export default defineNuxtPlugin((nuxtApp) => {
+  const modalState = shallowRef<ModalState>({
+    component: 'div',
+    props: {}
+  })
+
+  nuxtApp.vueApp.provide(modalInjectionKey, modalState)
+})

src/runtime/types/component.d.ts

@@ -0,0 +1,14 @@
+export type ComponentProps<T> =
+T extends new () => { $props: infer P } ? NonNullable<P> :
+  T extends (props: infer P, ...args: any) => any ? P :
+      {}
+
+export type ComponentSlots<T> =
+T extends new () => { $slots: infer S } ? NonNullable<S> :
+  T extends (props: any, ctx: { slots: infer S; attrs: any; emit: any }, ...args: any) => any ? NonNullable<S> :
+      {}
+
+export type ComponentEmit<T> =
+T extends new () => { $emit: infer E } ? NonNullable<E> :
+  T extends (props: any, ctx: { slots: any; attrs: any; emit: infer E }, ...args: any) => any ? NonNullable<E> :
+      {}

src/runtime/types/index.d.ts

@@ -16,6 +16,7 @@ export * from './input'
 export * from './kbd'
 export * from './link'
 export * from './meter'
+export * from './modal'
 export * from './notification'
 export * from './popper'
 export * from './progress'

src/runtime/types/modal.d.ts

@@ -0,0 +1,18 @@
+import type { Component } from 'vue'
+
+export interface Modal {
+  appear?: boolean
+  overlay?: boolean
+  transition?: boolean
+  preventClose?: boolean
+  fullscreen?: boolean
+  class?: string | Object | string[]
+  ui?: any
+  onClose?: () => void
+  onClosePrevented?: () => void
+}
+
+export interface ModalState {
+  component: Component | string
+  props: Modal
+}