36 lines
1.5 KiB
TypeScript
36 lines
1.5 KiB
TypeScript
/** 在高亮着的名字的各处出现之间跳：两条命令、快捷键的 when 子句用的上下文键。 */
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export const NEXT_OCCURRENCE = 'superpowers.codeReader.nextOccurrence'
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export const PREVIOUS_OCCURRENCE = 'superpowers.codeReader.previousOccurrence'
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/** 活动的预览里能用键盘跳（有高亮、页面有焦点、焦点不在输入框里）。 */
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export const OCCURRENCES_CONTEXT = 'superpowers.codeReader.hasOccurrences'
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/**
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* 上下文键跟着各预览报来的状态走：有一个预览能跳就是真（同一时刻只有一个页面有焦点），变了才设。
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* 预览关掉时当它不能跳；标签页切走时页面失了焦点，自己会报不能跳。
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*/
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export class NavigationContext<Owner> {
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private readonly available = new Set<Owner>()
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private value = false
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constructor(private readonly set: (value: boolean) => void) {}
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update(owner: Owner, available: boolean): void {
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if (available)
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this.available.add(owner)
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else
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this.available.delete(owner)
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const value = this.available.size > 0
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if (value === this.value)
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return
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this.value = value
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this.set(value)
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}
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/** 命令发给哪个预览：报了能跳的那个；从命令面板运行时页面没焦点，就发给活动的那个。 */
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target(owners: Iterable<Owner>, active: (owner: Owner) => boolean): Owner | undefined {
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const list = [...owners]
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return list.find(owner => this.available.has(owner)) ?? list.find(active)
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}
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}
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