Kernel 细节（render / runtime / state）

Render phase 与 layer

UiRenderPhase 顺序：

1. BEHIND
2. BACKGROUND
3. FRAME
4. ELEMENT
5. SPLIT
6. WIDGET
7. TOOLTIP
8. OVERLAY

UiRenderLayer = (phase, order)。
UiRenderTaskQueue 按 phase -> order -> serial 排序执行。

Runtime 与响应式状态

• UiRuntime.frameTick()：
  • scheduler.drain()
  • stateKernel.flush()
• StateKernel：
  • 可变信号：mutableSignal
  • 计算信号：computedSignal
  • 副作用：effect
  • 批处理：batch

示例：

UiRuntime runtime = UiRuntime.createForCurrentThread();
var state = runtime.state();
 
var count = state.mutableSignal(0);
var text = state.computedSignal(() -> "Count = " + count.get());
state.effect(() -> System.out.println(text.get()));
 
state.batch(() -> {
    count.set(1);
    count.set(2);
});
runtime.frameTick();