600 lines
13 KiB
Vue
600 lines
13 KiB
Vue
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<template>
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<div class="event-bus-demo">
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<div class="demo-header">
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<h4>事件总线通信演示</h4>
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<p class="hint">观察多个独立组件如何通过事件总线进行通信，注意内存管理的重要性</p>
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</div>
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<div class="architecture-view">
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<div class="central-hub" :class="{ active: isTransmitting }">
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<div class="hub-core">
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<div class="hub-icon">🔌</div>
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<div class="hub-label">Event Bus</div>
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<div class="hub-status">{{ isTransmitting ? '传输中...' : '待机' }}</div>
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</div>
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<div class="hub-rings">
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<div class="ring ring-1"></div>
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<div class="ring ring-2"></div>
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<div class="ring ring-3"></div>
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</div>
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</div>
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<div class="connected-components">
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<div
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v-for="comp in components"
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:key="comp.id"
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class="component-node"
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:class="{ active: comp.isActive, emitting: comp.isEmitting, listening: comp.isListening }"
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:style="{ top: comp.y + '%', left: comp.x + '%' }"
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>
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<div class="node-header">
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<span class="node-icon">{{ comp.icon }}</span>
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<span class="node-name">{{ comp.name }}</span>
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</div>
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<div class="node-status">
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<span class="status-dot" :class="{ active: comp.isListening }"></span>
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{{ comp.isListening ? '监听中' : '未监听' }}
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</div>
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<button class="emit-btn" @click="emitEvent(comp)">
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发送事件
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</button>
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</div>
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</div>
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<svg class="connection-lines" viewBox="0 0 100 100" preserveAspectRatio="none">
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<defs>
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<marker id="arrowhead" markerWidth="6" markerHeight="6" refX="5" refY="3" orient="auto">
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<polygon points="0 0, 6 3, 0 6" :fill="isTransmitting ? 'var(--vp-c-brand)' : 'var(--vp-c-divider)'" />
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</marker>
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</defs>
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<line
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v-for="(comp, index) in components"
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:key="index"
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class="connection-line"
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:class="{ active: comp.isEmitting || isTransmitting }"
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:x1="comp.x"
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:y1="comp.y"
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x2="50"
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y2="50"
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marker-end="url(#arrowhead)"
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/>
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</svg>
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</div>
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<div class="event-log">
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<div class="log-header">
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<h5>📨 事件日志</h5>
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<button class="clear-btn" @click="clearLogs">清空</button>
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</div>
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<div class="log-content">
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<div v-if="logs.length === 0" class="empty-log">
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暂无事件记录，点击组件上的"发送事件"按钮开始测试
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</div>
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<div
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v-for="(log, index) in logs"
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:key="index"
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class="log-item"
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:class="log.type"
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>
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<span class="log-time">{{ log.time }}</span>
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<span class="log-type">{{ log.type === 'emit' ? '发送' : '接收' }}</span>
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<span class="log-from">{{ log.from }}</span>
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<span class="log-arrow">➜</span>
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<span class="log-to">{{ log.to }}</span>
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<span class="log-data">{{ log.data }}</span>
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</div>
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</div>
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</div>
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<div class="memory-warning">
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<div class="warning-icon">⚠️</div>
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<div class="warning-content">
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<h6>内存泄漏风险提醒</h6>
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<p>使用 Event Bus 时，如果组件销毁前没有取消订阅（$off），会导致内存泄漏。推荐在 beforeUnmount 钩子中清理订阅。</p>
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<pre><code>// 正确做法
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export default {
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created() {
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this.$bus.$on('event', this.handler)
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},
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beforeUnmount() {
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this.$bus.$off('event', this.handler) // 必须取消订阅
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}
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}</code></pre>
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</div>
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</div>
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</div>
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</template>
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<script setup>
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import { ref, reactive, onBeforeUnmount } from 'vue'
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// 组件定义
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const components = reactive([
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{ id: 1, name: 'Header', icon: '📌', x: 15, y: 15, isActive: false, isEmitting: false, isListening: true },
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{ id: 2, name: 'Sidebar', icon: '📑', x: 85, y: 15, isActive: false, isEmitting: false, isListening: true },
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{ id: 3, name: 'ProductList', icon: '🛍️', x: 15, y: 85, isActive: false, isEmitting: false, isListening: true },
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{ id: 4, name: 'Cart', icon: '🛒', x: 85, y: 85, isActive: false, isEmitting: false, isListening: true }
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])
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const isTransmitting = ref(false)
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const logs = ref([])
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// 格式化时间
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const formatTime = () => {
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const now = new Date()
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return `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}:${now.getSeconds().toString().padStart(2, '0')}.${now.getMilliseconds().toString().padStart(3, '0')}`
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}
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// 添加日志
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const addLog = (type, from, to, data) => {
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logs.value.unshift({
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type,
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time: formatTime(),
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from,
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to,
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data: JSON.stringify(data)
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})
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if (logs.value.length > 50) {
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logs.value = logs.value.slice(0, 50)
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}
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}
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// 发送事件
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const emitEvent = (comp) => {
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// 触发发送动画
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comp.isEmitting = true
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isTransmitting.value = true
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// 记录发送日志
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addLog('emit', comp.name, 'Event Bus', { event: 'user:action', payload: { from: comp.name } })
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// 模拟其他组件接收
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components.forEach(target => {
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if (target.id !== comp.id && target.isListening) {
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setTimeout(() => {
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target.isActive = true
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addLog('receive', 'Event Bus', target.name, { event: 'user:action', payload: { from: comp.name } })
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setTimeout(() => {
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target.isActive = false
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}, 500)
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}, 300 + Math.random() * 200)
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}
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})
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// 清理动画状态
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setTimeout(() => {
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comp.isEmitting = false
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isTransmitting.value = false
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}, 1000)
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}
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// 清空日志
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const clearLogs = () => {
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logs.value = []
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}
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onBeforeUnmount(() => {
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// 模拟清理订阅
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components.forEach(comp => {
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comp.isListening = false
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})
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})
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</script>
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<style scoped>
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.event-bus-demo {
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border: 1px solid var(--vp-c-divider);
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border-radius: 8px;
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padding: 20px;
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background: var(--vp-c-bg-soft);
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}
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.demo-header {
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margin-bottom: 20px;
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}
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.demo-header h4 {
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margin: 0 0 8px 0;
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color: var(--vp-c-text-1);
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}
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.hint {
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margin: 0;
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font-size: 14px;
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color: var(--vp-c-text-2);
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}
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.architecture-view {
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position: relative;
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min-height: 400px;
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background: var(--vp-c-bg);
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border-radius: 8px;
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padding: 20px;
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margin-bottom: 20px;
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overflow: hidden;
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}
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.central-hub {
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position: absolute;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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z-index: 10;
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}
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.hub-core {
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position: relative;
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z-index: 2;
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width: 100px;
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height: 100px;
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background: linear-gradient(135deg, var(--vp-c-brand), var(--vp-c-brand-light));
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border-radius: 50%;
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
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transition: all 0.3s ease;
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}
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.central-hub.active .hub-core {
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transform: scale(1.1);
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box-shadow: 0 0 30px var(--vp-c-brand);
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}
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.hub-icon {
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font-size: 28px;
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margin-bottom: 2px;
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}
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.hub-label {
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font-size: 11px;
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font-weight: 600;
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color: white;
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text-align: center;
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}
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.hub-status {
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font-size: 9px;
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color: rgba(255, 255, 255, 0.8);
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margin-top: 2px;
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}
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.hub-rings {
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position: absolute;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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}
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.ring {
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position: absolute;
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top: 50%;
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left: 50%;
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transform: translate(-50%, -50%);
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border: 2px solid var(--vp-c-divider);
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border-radius: 50%;
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opacity: 0.3;
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transition: all 0.3s ease;
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}
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.central-hub.active .ring {
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border-color: var(--vp-c-brand);
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opacity: 0.6;
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}
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.ring-1 { width: 140px; height: 140px; }
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.ring-2 { width: 180px; height: 180px; }
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.ring-3 { width: 220px; height: 220px; }
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.central-hub.active .ring-1 { animation: pulse1 1s ease infinite; }
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.central-hub.active .ring-2 { animation: pulse2 1s ease infinite 0.2s; }
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.central-hub.active .ring-3 { animation: pulse3 1s ease infinite 0.4s; }
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@keyframes pulse1 {
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0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.6; }
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50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.3; }
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}
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@keyframes pulse2 {
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0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.4; }
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50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.2; }
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}
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@keyframes pulse3 {
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0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.2; }
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50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.1; }
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}
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.connected-components {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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pointer-events: none;
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}
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.component-node {
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position: absolute;
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background: var(--vp-c-bg);
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border: 2px solid var(--vp-c-divider);
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border-radius: 8px;
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padding: 12px;
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min-width: 120px;
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pointer-events: auto;
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transition: all 0.3s ease;
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cursor: pointer;
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}
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.component-node:hover {
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transform: translateY(-2px);
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box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
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}
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.component-node.active {
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border-color: #22c55e;
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background: #f0fdf4;
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box-shadow: 0 0 0 3px #bbf7d0;
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}
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.component-node.emitting {
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border-color: var(--vp-c-brand);
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animation: emitPulse 0.5s ease;
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}
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@keyframes emitPulse {
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0%, 100% { transform: scale(1); }
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50% { transform: scale(1.05); }
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}
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.node-header {
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display: flex;
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align-items: center;
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gap: 6px;
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margin-bottom: 6px;
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}
|
|||
|
|
|
|||
|
|
.node-icon {
|
|||
|
|
font-size: 16px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.node-name {
|
|||
|
|
font-weight: 600;
|
|||
|
|
font-size: 12px;
|
|||
|
|
color: var(--vp-c-text-1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.node-status {
|
|||
|
|
display: flex;
|
|||
|
|
align-items: center;
|
|||
|
|
gap: 4px;
|
|||
|
|
font-size: 11px;
|
|||
|
|
color: var(--vp-c-text-2);
|
|||
|
|
margin-bottom: 8px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.status-dot {
|
|||
|
|
width: 6px;
|
|||
|
|
height: 6px;
|
|||
|
|
border-radius: 50%;
|
|||
|
|
background: var(--vp-c-divider);
|
|||
|
|
transition: all 0.3s ease;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.status-dot.active {
|
|||
|
|
background: #22c55e;
|
|||
|
|
box-shadow: 0 0 4px #22c55e;
|
|||
|
|
animation: blink 1.5s ease infinite;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
@keyframes blink {
|
|||
|
|
0%, 100% { opacity: 1; }
|
|||
|
|
50% { opacity: 0.5; }
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.emit-btn {
|
|||
|
|
width: 100%;
|
|||
|
|
padding: 6px 10px;
|
|||
|
|
background: var(--vp-c-brand);
|
|||
|
|
color: white;
|
|||
|
|
border: none;
|
|||
|
|
border-radius: 4px;
|
|||
|
|
font-size: 11px;
|
|||
|
|
cursor: pointer;
|
|||
|
|
transition: all 0.2s ease;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.emit-btn:hover {
|
|||
|
|
background: var(--vp-c-brand-dark);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.connection-lines {
|
|||
|
|
position: absolute;
|
|||
|
|
top: 0;
|
|||
|
|
left: 0;
|
|||
|
|
width: 100%;
|
|||
|
|
height: 100%;
|
|||
|
|
pointer-events: none;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.connection-line {
|
|||
|
|
stroke: var(--vp-c-divider);
|
|||
|
|
stroke-width: 2;
|
|||
|
|
fill: none;
|
|||
|
|
transition: all 0.3s ease;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.connection-line.active {
|
|||
|
|
stroke: var(--vp-c-brand);
|
|||
|
|
stroke-width: 3;
|
|||
|
|
filter: drop-shadow(0 0 4px var(--vp-c-brand));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.event-log {
|
|||
|
|
margin-top: 20px;
|
|||
|
|
background: var(--vp-c-bg);
|
|||
|
|
border: 1px solid var(--vp-c-divider);
|
|||
|
|
border-radius: 8px;
|
|||
|
|
overflow: hidden;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-header {
|
|||
|
|
display: flex;
|
|||
|
|
justify-content: space-between;
|
|||
|
|
align-items: center;
|
|||
|
|
padding: 12px 16px;
|
|||
|
|
background: var(--vp-c-bg-soft);
|
|||
|
|
border-bottom: 1px solid var(--vp-c-divider);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-header h5 {
|
|||
|
|
margin: 0;
|
|||
|
|
font-size: 14px;
|
|||
|
|
color: var(--vp-c-text-1);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.clear-btn {
|
|||
|
|
padding: 4px 12px;
|
|||
|
|
background: transparent;
|
|||
|
|
border: 1px solid var(--vp-c-divider);
|
|||
|
|
border-radius: 4px;
|
|||
|
|
font-size: 12px;
|
|||
|
|
color: var(--vp-c-text-2);
|
|||
|
|
cursor: pointer;
|
|||
|
|
transition: all 0.2s ease;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.clear-btn:hover {
|
|||
|
|
border-color: var(--vp-c-brand);
|
|||
|
|
color: var(--vp-c-brand);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-content {
|
|||
|
|
max-height: 200px;
|
|||
|
|
overflow-y: auto;
|
|||
|
|
padding: 8px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.empty-log {
|
|||
|
|
text-align: center;
|
|||
|
|
padding: 40px;
|
|||
|
|
color: var(--vp-c-text-3);
|
|||
|
|
font-size: 13px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-item {
|
|||
|
|
display: flex;
|
|||
|
|
align-items: center;
|
|||
|
|
gap: 8px;
|
|||
|
|
padding: 8px 12px;
|
|||
|
|
margin-bottom: 4px;
|
|||
|
|
border-radius: 4px;
|
|||
|
|
font-size: 12px;
|
|||
|
|
font-family: monospace;
|
|||
|
|
animation: slideIn 0.3s ease;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
@keyframes slideIn {
|
|||
|
|
from {
|
|||
|
|
opacity: 0;
|
|||
|
|
transform: translateX(-10px);
|
|||
|
|
}
|
|||
|
|
to {
|
|||
|
|
opacity: 1;
|
|||
|
|
transform: translateX(0);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-item.emit {
|
|||
|
|
background: #eff6ff;
|
|||
|
|
border-left: 3px solid #3b82f6;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-item.receive {
|
|||
|
|
background: #f0fdf4;
|
|||
|
|
border-left: 3px solid #22c55e;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-time {
|
|||
|
|
color: var(--vp-c-text-3);
|
|||
|
|
font-size: 11px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-type {
|
|||
|
|
padding: 2px 6px;
|
|||
|
|
border-radius: 3px;
|
|||
|
|
font-size: 10px;
|
|||
|
|
font-weight: 600;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-item.emit .log-type {
|
|||
|
|
background: #dbeafe;
|
|||
|
|
color: #1d4ed8;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-item.receive .log-type {
|
|||
|
|
background: #bbf7d0;
|
|||
|
|
color: #15803d;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-from,
|
|||
|
|
.log-to {
|
|||
|
|
color: var(--vp-c-text-2);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-arrow {
|
|||
|
|
color: var(--vp-c-divider);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.log-data {
|
|||
|
|
color: var(--vp-c-brand);
|
|||
|
|
max-width: 200px;
|
|||
|
|
overflow: hidden;
|
|||
|
|
text-overflow: ellipsis;
|
|||
|
|
white-space: nowrap;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.memory-warning {
|
|||
|
|
margin-top: 20px;
|
|||
|
|
padding: 16px;
|
|||
|
|
background: #fffbeb;
|
|||
|
|
border: 1px solid #fcd34d;
|
|||
|
|
border-radius: 8px;
|
|||
|
|
display: flex;
|
|||
|
|
gap: 12px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.warning-icon {
|
|||
|
|
font-size: 24px;
|
|||
|
|
flex-shrink: 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.warning-content h6 {
|
|||
|
|
margin: 0 0 4px 0;
|
|||
|
|
color: #92400e;
|
|||
|
|
font-size: 14px;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.warning-content p {
|
|||
|
|
margin: 0 0 8px 0;
|
|||
|
|
color: #a16207;
|
|||
|
|
font-size: 13px;
|
|||
|
|
line-height: 1.5;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.warning-content pre {
|
|||
|
|
margin: 0;
|
|||
|
|
padding: 12px;
|
|||
|
|
background: #fef3c7;
|
|||
|
|
border-radius: 4px;
|
|||
|
|
font-size: 12px;
|
|||
|
|
overflow-x: auto;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
.warning-content code {
|
|||
|
|
color: #92400e;
|
|||
|
|
font-family: monospace;
|
|||
|
|
}
|
|||
|
|
</style>
|