ultraviolet/tree_node.go

package ultraviolet

import (
	"sync"
)

type NodeList []*Node
type NodeMap map[string]*Node
type NodeIds map[string]int

type Node struct {
	mutex     sync.Mutex
	Component Component
	Children  NodeList
}

func NewNode(component Component) *Node {
	return &Node{
		Children:  NodeList{},
		Component: component,
	}
}

func (this *Node) Build(node *Node) {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	this.Component.Clean()
	this.Children = NodeList{node}
	for _, child := range this.Children {
		child.update(this.Component, true)
	}
}

func (this *Node) Update() {
	this.mutex.Lock()
	defer this.mutex.Unlock()

	this.update(nil, false)
}

func (this *Node) update(parent Component, force bool) {
	if this.Component.Invalidate() || force {
		this.Component.Build(parent)
		force = true
	}

	for _, item := range this.Children {
		item.update(this.Component, force)
	}
}