paintWithContext()

in packages/core/src/rendering/render-object.ts [1011:1055]

• 45 lines of code
• 9 McCabe index (conditional complexity)

  /* friend of RenderPipeline */paintWithContext(context: PaintingContext, offset: Point) {
    assert(!this._debugDoingThisPaint, '节点不能单独重复调用 _paintWithContext')
    if (this._layoutDirty) {
      return
    }
    assert(() => {
      if (this._needsCompositingDirty) {
        if (this.parent) {
          let visitedByParent = false
          this.parent.visitChildren(child => {
            if (child === this) {
              visitedByParent = true
            }
          })
          if (!visitedByParent) {
            throw new Error(`节点未通过其父节点进行绘制`)
          }
        }
        throw new Error(`不允许节点在 _needsCompositingDirty = true 时绘制`)
      }
    })
    let debugLastActivePaint: RenderObject | undefined
    assert(() => {
      this._debugDoingThisPaint = true
      debugLastActivePaint = RenderObject._debugActivePaint
      RenderObject._debugActivePaint = this
      assert(!this.repaintBoundary || this._layer !== null)
    })
    this._paintDirty = false
    if (!this._hidden) {
      try {
        this.paint(context, offset)
        this.onPaint?.(offset)
        assert(!this._layoutDirty, '检测到 paint 方法中重新将 _layoutDirty 标记为 true')
        assert(!this._paintDirty, '检测到 paint 方法中重新将 _paintDirty 标记为 true')
      } catch (err) {
        console.error(err)
      }
    }
    assert(() => {
      this.debugPaint(context, offset)
      RenderObject._debugActivePaint = debugLastActivePaint
      this._debugDoingThisPaint = false
    })
  }