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124 lines
3.9 KiB
124 lines
3.9 KiB
'use strict';
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import { commands, Disposable } from 'vscode';
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import { CommandContext, extensionId, setCommandContext } from './constants';
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import { Logger } from './logger';
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export declare interface KeyCommand {
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onDidPressKey?(key: Keys): Promise<{} | undefined>;
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}
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const keyNoopCommand = Object.create(null) as KeyCommand;
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export { keyNoopCommand as KeyNoopCommand };
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export declare type Keys = 'left' | 'right' | ',' | '.' | 'escape';
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export const keys: Keys[] = ['left', 'right', ',', '.', 'escape'];
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export declare interface KeyMapping {
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[id: string]: KeyCommand | (() => Promise<KeyCommand>) | undefined;
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}
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const mappings: KeyMapping[] = [];
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export class KeyboardScope implements Disposable {
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constructor(
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private readonly mapping: KeyMapping
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) {
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for (const key in mapping) {
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mapping[key] = mapping[key] || keyNoopCommand;
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}
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}
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async dispose() {
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const index = mappings.indexOf(this.mapping);
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Logger.log('KeyboardScope.dispose', mappings.length, index);
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if (index === mappings.length - 1) {
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mappings.pop();
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await this.updateKeyCommandsContext(mappings[mappings.length - 1]);
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}
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else {
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mappings.splice(index, 1);
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}
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}
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async begin() {
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mappings.push(this.mapping);
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await this.updateKeyCommandsContext(this.mapping);
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return this;
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}
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async clearKeyCommand(key: Keys) {
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const mapping = mappings[mappings.length - 1];
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if (mapping !== this.mapping || !mapping[key]) return;
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Logger.log('KeyboardScope.clearKeyCommand', mappings.length, key);
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mapping[key] = undefined;
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await setCommandContext(`${CommandContext.Key}:${key}`, false);
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}
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async setKeyCommand(key: Keys, command: KeyCommand | (() => Promise<KeyCommand>)) {
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const mapping = mappings[mappings.length - 1];
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if (mapping !== this.mapping) return;
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Logger.log('KeyboardScope.setKeyCommand', mappings.length, key, Boolean(mapping[key]));
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if (!mapping[key]) {
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mapping[key] = command;
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await setCommandContext(`${CommandContext.Key}:${key}`, true);
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}
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else {
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mapping[key] = command;
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}
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}
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private async updateKeyCommandsContext(mapping: KeyMapping) {
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const promises = [];
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for (const key of keys) {
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promises.push(setCommandContext(`${CommandContext.Key}:${key}`, Boolean(mapping && mapping[key])));
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}
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await Promise.all(promises);
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}
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}
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export class Keyboard implements Disposable {
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private _disposable: Disposable;
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constructor() {
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const subscriptions = keys.map(key =>
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commands.registerCommand(`${extensionId}.key.${key}`, () => this.execute(key), this)
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);
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this._disposable = Disposable.from(...subscriptions);
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}
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dispose() {
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this._disposable && this._disposable.dispose();
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}
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async beginScope(mapping?: KeyMapping): Promise<KeyboardScope> {
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Logger.log('Keyboard.beginScope', mappings.length);
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return await new KeyboardScope(
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mapping ? Object.assign(Object.create(null), mapping) : Object.create(null)
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).begin();
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}
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async execute(key: Keys): Promise<{} | undefined> {
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if (!mappings.length) return undefined;
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try {
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const mapping = mappings[mappings.length - 1];
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let command = mapping[key] as KeyCommand | (() => Promise<KeyCommand>);
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if (typeof command === 'function') {
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command = await command();
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}
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if (!command || typeof command.onDidPressKey !== 'function') return undefined;
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Logger.log('Keyboard.execute', key);
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return await command.onDidPressKey(key);
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}
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catch (ex) {
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Logger.error(ex, 'Keyboard.execute');
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return undefined;
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}
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}
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}
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