feat(Slideover): open programmatically (#1465)

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

docs/components/content/examples/SlideoverExampleComponent.vue

@@ -0,0 +1,30 @@
+<script lang="ts" setup>
+
+const props = defineProps({
+  count: {
+    type: Number,
+    default: 0
+  }
+})
+
+const emits = defineEmits<{
+  close: [];
+}>()
+</script>
+
+<template>
+  <USlideover>
+    <UCard class="flex flex-col flex-1" :ui="{ body: { base: 'flex-1' }, ring: '', divide: 'divide-y divide-gray-100 dark:divide-gray-800' }">
+      <template #header>
+        <div class="flex items-center justify-between">
+          <h3 class="text-base font-semibold leading-6 text-gray-900 dark:text-white">
+            Opened programmatically: {{ props.count }} times
+          </h3>
+          <UButton color="gray" variant="ghost" icon="i-heroicons-x-mark-20-solid" class="-my-1" @click="emits('close')" />
+        </div>
+      </template>
+  
+      <Placeholder class="h-full" />
+    </UCard>
+  </USlideover>
+</template>

docs/components/content/examples/SlideoverExampleComposable.vue

@@ -0,0 +1,16 @@
+<script setup lang="ts">
+import { SlideoverExampleComponent } from '#components'
+const slideover = useSlideover()
+const count = ref(0)
+function openSlideover () {
+  count.value += 1
+  slideover.open(SlideoverExampleComponent, {
+    count: count.value,
+    onClose: slideover.close
+  })
+}
+</script>
+
+<template>
+  <UButton label="Reveal slideover" @click="openSlideover" />
+</template>