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63 lines
2.5 KiB
63 lines
2.5 KiB
"use strict";
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/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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Object.defineProperty(exports, "__esModule", { value: true });
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const vscode = require("vscode");
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const dispose_1 = require("../util/dispose");
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const file_1 = require("./file");
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class HTMLFileTopmostLineMonitor {
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constructor() {
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this.disposables = [];
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this.pendingUpdates = new Map();
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this.throttle = 50;
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this._onDidChangeTopmostLineEmitter = new vscode.EventEmitter();
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this.onDidChangeTopmostLine = this._onDidChangeTopmostLineEmitter.event;
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vscode.window.onDidChangeTextEditorVisibleRanges(event => {
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if (file_1.isHTMLFile(event.textEditor.document)) {
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const line = getVisibleLine(event.textEditor);
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if (typeof line === 'number') {
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this.updateLine(event.textEditor.document.uri, line);
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}
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}
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}, null, this.disposables);
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}
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dispose() {
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dispose_1.disposeAll(this.disposables);
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}
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updateLine(resource, line) {
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const key = resource.toString();
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if (!this.pendingUpdates.has(key)) {
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// schedule update
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setTimeout(() => {
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if (this.pendingUpdates.has(key)) {
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this._onDidChangeTopmostLineEmitter.fire({
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resource,
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line: this.pendingUpdates.get(key)
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});
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this.pendingUpdates.delete(key);
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}
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}, this.throttle);
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}
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this.pendingUpdates.set(key, line);
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}
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}
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exports.HTMLFileTopmostLineMonitor = HTMLFileTopmostLineMonitor;
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/**
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* Get the top-most visible range of `editor`.
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*
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* Returns a fractional line number based the visible character within the line.
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* Floor to get real line number
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*/
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function getVisibleLine(editor) {
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if (!editor.visibleRanges.length) {
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return undefined;
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}
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const firstVisiblePosition = editor.visibleRanges[0].start;
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const lineNumber = firstVisiblePosition.line;
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const line = editor.document.lineAt(lineNumber);
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const progress = firstVisiblePosition.character / (line.text.length + 2);
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return lineNumber + progress;
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}
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exports.getVisibleLine = getVisibleLine;
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