examples: add confirm delete example (#1466)

* examples: add confirm delete example

* docs: add confirm delete example

docs/examples/confirm-delete/App.vue

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+<script setup>
+import { ref } from 'vue'
+import { VueFlow, useVueFlow } from '@vue-flow/core'
+import { Background } from '@vue-flow/background'
+import { useDialog } from './useDialog'
+import Dialog from './Dialog.vue'
+
+const { onConnect, addEdges, onNodesChange, onEdgesChange, applyNodeChanges, applyEdgeChanges } = useVueFlow()
+
+const dialog = useDialog()
+
+const nodes = ref([
+  { id: '1', type: 'input', label: 'Node 1', position: { x: 250, y: 5 }, class: 'light' },
+  { id: '2', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },
+  { id: '3', label: 'Node 3', position: { x: 400, y: 100 }, class: 'light' },
+  { id: '4', label: 'Node 4', position: { x: 400, y: 200 }, class: 'light' },
+])
+
+const edges = ref([
+  { id: 'e1-2', source: '1', target: '2', animated: true },
+  { id: 'e1-3', source: '1', target: '3' },
+])
+
+onConnect(addEdges)
+
+onNodesChange(async (changes) => {
+  const nextChanges = []
+
+  for (const change of changes) {
+    if (change.type === 'remove') {
+      const isConfirmed = await dialog.confirm(`Do you really want to delete this node: ${change.id}?`)
+
+      if (isConfirmed) {
+        nextChanges.push(change)
+      }
+    } else {
+      nextChanges.push(change)
+    }
+  }
+
+  applyNodeChanges(nextChanges)
+})
+
+onEdgesChange(async (changes) => {
+  const nextChanges = []
+
+  for (const change of changes) {
+    if (change.type === 'remove') {
+      const isConfirmed = await dialog.confirm(`Do you really want to delete this edge: ${change.id}?`)
+
+      if (isConfirmed) {
+        nextChanges.push(change)
+      }
+    } else {
+      nextChanges.push(change)
+    }
+  }
+
+  applyEdgeChanges(nextChanges)
+})
+</script>
+
+<template>
+  <VueFlow :nodes="nodes" :edges="edges" :apply-default="false" fit-view-on-init class="vue-flow-basic-example">
+    <Background />
+
+    <Dialog />
+  </VueFlow>
+</template>