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<div class="workflow-viewer">
<VueFlow
:id="flowId"
:nodes="nodes"
:edges="edges"
:nodes-draggable="false"
:nodes-connectable="false"
:pan-on-scroll="false"
:zoom-on-double-click="false"
class="workflow-canvas"
@init="onInit"
>
<Background pattern-color="#ddd" :gap="16" />
<template #node-workflow="nodeProps">
<!-- State Node -->
<div
v-if="!nodeProps.data.isTransition"
class="viewer-node"
:class="{
'viewer-node--start': nodeProps.data.isStart,
'viewer-node--current': nodeProps.data.stateId === currentStateId
}"
>
<Handle id="left" type="target" :position="Position.Left" class="viewer-handle" />
<Handle id="right" type="target" :position="Position.Right" class="viewer-handle" />
<Handle id="top" type="target" :position="Position.Top" class="viewer-handle" />
<Handle id="bottom" type="target" :position="Position.Bottom" class="viewer-handle" />
<Handle id="left" type="source" :position="Position.Left" class="viewer-handle" />
<Handle id="right" type="source" :position="Position.Right" class="viewer-handle" />
<Handle id="top" type="source" :position="Position.Top" class="viewer-handle" />
<Handle id="bottom" type="source" :position="Position.Bottom" class="viewer-handle" />
<div class="viewer-node__label">{{ getTranslation(nodeProps.data.rawLabel) }}</div>
</div>
<!-- Transition Node -->
<div v-else class="viewer-transition">
<Handle id="left" type="target" :position="Position.Left" class="viewer-handle" />
<Handle id="right" type="target" :position="Position.Right" class="viewer-handle" />
<Handle id="top" type="target" :position="Position.Top" class="viewer-handle" />
<Handle id="bottom" type="target" :position="Position.Bottom" class="viewer-handle" />
<Handle id="left" type="source" :position="Position.Left" class="viewer-handle" />
<Handle id="right" type="source" :position="Position.Right" class="viewer-handle" />
<Handle id="top" type="source" :position="Position.Top" class="viewer-handle" />
<Handle id="bottom" type="source" :position="Position.Bottom" class="viewer-handle" />
<div class="viewer-transition__label">
{{ getTranslation(nodeProps.data.rawLabel) || '…' }}
</div>
</div>
</template>
</VueFlow>
</div>
</template>
<script setup lang="ts">
// @implements UC-WORKFLOW-003.1
import { ref, watch, nextTick } from 'vue'
import { VueFlow, Handle, Position } from '@vue-flow/core'
import { Background } from '@vue-flow/background'
import type { Node, Edge, VueFlowStore } from '@vue-flow/core'
import type { WorkflowDefinition } from '@/schemas/entity-schema'
interface Props {
workflowDefinition?: WorkflowDefinition
currentStateId?: string
getTranslation: (value: string | Record<string, string> | null | undefined) => string
}
const props = withDefaults(defineProps<Props>(), {
workflowDefinition: undefined,
currentStateId: undefined
})
const flowId = `workflow-viewer-${Math.random().toString(36).slice(2, 9)}`
const vueFlowInstance = ref<VueFlowStore | null>(null)
const nodes = ref<Node[]>([])
const edges = ref<Edge[]>([])
// ── Geometry helpers (same logic as WorkflowEditor) ─────────────────────────
function isConnectionHorizontal(fromX: number, fromY: number, toX: number, toY: number): boolean {
return Math.abs(toX - fromX) >= Math.abs(toY - fromY)
}
function getSourceHandle(fx: number, fy: number, tx: number, ty: number): string {
if (isConnectionHorizontal(fx, fy, tx, ty)) return 'right'
return fy < ty ? 'bottom' : 'top'
}
function getTargetHandle(fx: number, fy: number, tx: number, ty: number): string {
if (isConnectionHorizontal(fx, fy, tx, ty)) return 'left'
return fy < ty ? 'top' : 'bottom'
}
// ── Graph builders ───────────────────────────────────────────────────────────
function buildNodes() {
const def = props.workflowDefinition
if (!def?.states?.length) {
nodes.value = []
return
}
const SPACING_X = 320
const STATE_Y = 150
const TRANSITION_Y_ALIGN = 8
const BACK_TRANSITION_Y_OFFSET = -100
const stateNodes: Node[] = def.states.map((state, index) => {
const position = def.positions?.[state.id] ?? { x: 50 + index * SPACING_X, y: STATE_Y }
return {
id: state.id,
type: 'workflow',
position,
data: {
rawLabel: state.label,
stateId: state.id,
isTransition: false,
isStart: state.id === def.startStateId
}
}
})
const transitionNodes: Node[] = def.transitions.map((transition, index) => {
const transitionId = `t${index}`
const fromNode = stateNodes.find((n) => n.id === transition.from)
const toNode = stateNodes.find((n) => n.id === transition.to)
let position = def.positions?.[transitionId]
Eif (!position && fromNode && toNode) {
const midX = (fromNode.position.x + toNode.position.x) / 2
const isBackward = fromNode.position.x > toNode.position.x
position = {
x: midX,
y: isBackward
? STATE_Y + BACK_TRANSITION_Y_OFFSET + TRANSITION_Y_ALIGN
: STATE_Y + TRANSITION_Y_ALIGN
}
}
return {
id: transitionId,
type: 'workflow',
position: position ?? { x: 50, y: STATE_Y + TRANSITION_Y_ALIGN },
data: {
rawLabel: transition.label ?? '',
transitionIndex: index,
isTransition: true,
from: transition.from,
to: transition.to
}
}
})
nodes.value = [...stateNodes, ...transitionNodes]
}
function buildEdges() {
const def = props.workflowDefinition
if (!def?.transitions?.length) {
edges.value = []
return
}
const newEdges: Edge[] = []
def.transitions.forEach((transition, index) => {
const transitionId = `t${index}`
const fromNode = nodes.value.find((n) => n.id === transition.from)
const toNode = nodes.value.find((n) => n.id === transition.to)
const transitionNode = nodes.value.find((n) => n.id === transitionId)
Iif (!fromNode || !toNode || !transitionNode) return
const isH = isConnectionHorizontal(
fromNode.position.x,
fromNode.position.y,
toNode.position.x,
toNode.position.y
)
const tTargetHandle = isH
? fromNode.position.x < toNode.position.x
? 'left'
: 'right'
: fromNode.position.y < toNode.position.y
? 'top'
: 'bottom'
const tSourceHandle = isH
? fromNode.position.x < toNode.position.x
? 'right'
: 'left'
: fromNode.position.y < toNode.position.y
? 'bottom'
: 'top'
newEdges.push({
id: `e${index}-from`,
source: transition.from,
sourceHandle: getSourceHandle(
fromNode.position.x,
fromNode.position.y,
toNode.position.x,
toNode.position.y
),
target: transitionId,
targetHandle: tTargetHandle,
style: { strokeWidth: 2 }
})
newEdges.push({
id: `e${index}-to`,
source: transitionId,
sourceHandle: tSourceHandle,
target: transition.to,
targetHandle: getTargetHandle(
fromNode.position.x,
fromNode.position.y,
toNode.position.x,
toNode.position.y
),
markerEnd: 'arrowclosed',
style: { strokeWidth: 2 }
})
})
edges.value = newEdges
}
function buildGraph() {
buildNodes()
buildEdges()
nextTick(() => {
vueFlowInstance.value?.fitView({ padding: 0.25, duration: 150 })
})
}
// ── Init & watchers ──────────────────────────────────────────────────────────
function onInit(instance: VueFlowStore) {
vueFlowInstance.value = instance
nextTick(() => instance.fitView({ padding: 0.25, duration: 150 }))
}
// Rebuild graph when the workflow structure changes (nodes/edges geometry).
watch(() => props.workflowDefinition, buildGraph, { deep: true, immediate: true })
// Re-render state nodes when currentStateId changes so the --current
// class updates. No full fitView needed — just swap nodes/edges.
watch(
() => props.currentStateId,
() => {
buildNodes()
buildEdges()
}
)
</script>
<style>
/* VueFlow global styles — must not be scoped */
@import '@vue-flow/core/dist/style.css';
@import '@vue-flow/core/dist/theme-default.css';
</style>
<style scoped>
.workflow-canvas {
height: 260px;
border-radius: 0.375rem;
overflow: hidden;
}
/* Hide handles — they exist only to anchor edges */
.viewer-handle {
opacity: 0 !important;
pointer-events: none !important;
width: 8px !important;
height: 8px !important;
}
/* State node */
.viewer-node {
padding: 10px 18px;
border-radius: 8px;
background: #fff;
border: 2px solid #0d6efd;
font-weight: 500;
min-width: 110px;
text-align: center;
position: relative;
pointer-events: none;
}
.viewer-node--start {
border-color: #198754;
}
.viewer-node__label {
font-size: 13px;
color: #0d6efd;
}
.viewer-node--start .viewer-node__label {
color: #198754;
}
/* Current state: gold highlight */
.viewer-node--current {
border-color: #fd7e14;
background: #fff8f0;
box-shadow: 0 0 0 3px rgba(253, 126, 20, 0.25);
}
.viewer-node--current .viewer-node__label {
color: #e8590c;
font-weight: 700;
}
/* Transition node */
.viewer-transition {
padding: 5px 12px;
border-radius: 6px;
background: #f8f9fa;
border: 1px solid #adb5bd;
text-align: center;
pointer-events: none;
}
.viewer-transition__label {
font-size: 11px;
color: #6c757d;
user-select: none;
}
</style>
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