refactor: 优化渲染函数

将 widget 和 view 分散到不同的函数里面

src/engineer/render.ts

@@ -18,7 +18,8 @@ import { provideBlockId } from './context'
 import {
   align,
   background,
-  bordering, clip,
+  bordering,
+  clip,
   gap,
   insets,
   radii,
@@ -41,11 +42,26 @@ export type WidgetRenderFunction = (widget: Widget, view: View, axis?: Axis) =>
  */
 const widgets: Record<string, WidgetRenderFunction> = {}
 
+const views: Record<string, Component> = {
+  text: DddTextView,
+  image: DddImageView,
+  audio: DddAudioView,
+  video: DddAudioView,
+}
+
 export function registerWidget(some: Record<string, WidgetRenderFunction>): void {
   for (const [key, func] of Object.entries(some))
     widgets[key] = func
 }
 
+function renderWidget(widget: Widget, view: View, axis?: Axis): VNodeChild {
+  const func = widgets[widget.name]
+  if (typeof func !== 'function')
+    throw new Error(`unknown widget: ${widget.name}`)
+
+  return func(widget, view, axis)
+}
+
 const isWidget = (s: any): s is Widget => s != null && 'name' in s
 
 function isRefer(s: any): s is DataRefer {
@@ -56,6 +72,24 @@ function isRefer(s: any): s is DataRefer {
     && typeof s.key === 'string'
 }
 
+function renderRefer(refer: DataRefer, axis?: Axis): VNodeChild {
+  const { key, type, ...attrs } = refer
+  const component = views[type]
+  if (component) {
+    return h(component, {
+      source: key,
+      axis,
+      ...attrs,
+    })
+  }
+  return h('b', {
+    style: {
+      color: 'red',
+      fontSize: '36px',
+    },
+  }, 'unimplemented')
+}
+
 export function isFlexible(theme: Theme) {
   return theme.axis != null
     || theme.mainAlign != null
@@ -74,51 +108,11 @@ export function render(view?: ViewChildren, axis?: Axis): VNodeChild {
   if (Array.isArray(view))
     return view.map(v => render(v, axis))
 
-  if (isRefer(view)) {
-    const { key, ...attrs } = view
-    let component: Component | undefined
-    switch (view.type) {
-      case 'text':
-        component = DddTextView
-        return h(DddTextView, {
-          source: view.key,
-        })
-      case 'image':
-        component = DddImageView
-        return h(DddImageView, {
-          source: key,
-          ...attrs,
-        })
-      case 'audio':
-        component = DddAudioView
-        return h(DddAudioView, {
-          source: view.key,
-          title: view.title,
-        })
-      case 'video':
-        // todo ...
-    }
-    if (component) {
-      return h(component, {
-        source: key,
-        ...attrs,
-      })
-    }
-    return h('b', {
-      style: {
-        color: 'red',
-        fontSize: '36px',
-      },
-    }, 'unimplemented')
-  }
-  if (isWidget(view.theme)) {
-    const func = widgets[view.theme.name]
-    if (typeof func !== 'function')
-      throw new Error(`unknown widget: ${view.theme.name}`)
+  if (isRefer(view))
+    return renderRefer(view)
 
-    const widget = view.theme
-    return func(widget, view, axis)
-  }
+  if (isWidget(view.theme))
+    return renderWidget(view.theme, view, axis)
 
   const theme = view.theme
   const css: CSSProperties = {