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This commit is contained in:
Andrea Mah
2021-05-13 12:30:10 -06:00
parent d2894562d5
commit 3dec3b3385
3 changed files with 69 additions and 41 deletions
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70
extensions/markdown-language-features/src/util/topmostLineMonitor.ts
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@@ -9,19 +9,30 @@ import { isMarkdownFile } from './file';
export interface LastScrollLocation {
readonly line: number;
readonly uri: vscode.Uri | undefined;
readonly uri: vscode.Uri;
}
export class TopmostLineMonitor extends Disposable {
private readonly pendingUpdates = new Map<string, number>();
private readonly throttle = 50;
public previousMDTextEditor: vscode.TextEditor | undefined;
public previousStaticEditorInfo: LastScrollLocation = { line: 0, uri: undefined };
private previousMDTextEditors = new Map<string, vscode.TextEditor>();
private previousStaticEditorInfo = new Map<string, LastScrollLocation>();
private isPrevEditorCustom = false;
private readonly _onChanged = this._register(new vscode.EventEmitter<{ readonly resource: vscode.Uri, readonly line: number }>());
public readonly onDidChanged = this._onChanged.event;
private readonly _onEditorNeedsScrolling = this._register(new vscode.EventEmitter<{ readonly line: number, readonly editor: vscode.TextEditor }>());
public readonly onEditorNeedsScrolling = this._onEditorNeedsScrolling.event;
constructor() {
super();
this.previousMDTextEditor = vscode.window.activeTextEditor;
if (vscode.window.activeTextEditor) {
this.setPreviousMDTextEditorLine(vscode.window.activeTextEditor);
}
this._register(vscode.window.onDidChangeTextEditorVisibleRanges(event => {
if (isMarkdownFile(event.textEditor.document)) {
const line = getVisibleLine(event.textEditor);
@@ -33,22 +44,40 @@ export class TopmostLineMonitor extends Disposable {
this._register(vscode.window.onDidChangeActiveTextEditor(textEditor => {
// When at a markdown file, apply existing scroll settings from static preview if applicable.
// When at a markdown file, apply existing scroll settings from static preview if last editor was custom.
// Also save reference to text editor for line number reference later
if (textEditor && isMarkdownFile(textEditor.document!)) {
if (this.previousStaticEditorInfo.uri?.toString() === textEditor.document.uri.toString()) {
const line = this.previousStaticEditorInfo.line ? this.previousStaticEditorInfo.line : 0;
scrollEditorToLine(line, textEditor);
if (this.isPrevEditorCustom) {
const line = this.getPreviousStaticEditorLineByUri(textEditor.document.uri);
if (line) {
this._onEditorNeedsScrolling.fire({ line: line, editor: textEditor });
}
}
this.previousMDTextEditor = textEditor;
this.setPreviousMDTextEditorLine(textEditor);
}
this.isPrevEditorCustom = (textEditor === undefined);
}));
}
private readonly _onChanged = this._register(new vscode.EventEmitter<{ readonly resource: vscode.Uri, readonly line: number }>());
public readonly onDidChanged = this._onChanged.event;
public setPreviousMDTextEditorLine(editor: vscode.TextEditor) {
const uri = editor.document.uri;
this.previousMDTextEditors.set(uri.toString(), editor);
}
public getPreviousMDTextEditorLineByUri(resource: vscode.Uri) {
const editor = this.previousMDTextEditors.get(resource.toString());
return editor?.visibleRanges[0].start.line;
}
public setPreviousStaticEditorLine(scrollLocation: LastScrollLocation) {
this.previousStaticEditorInfo.set(scrollLocation.uri.toString(), scrollLocation);
}
public getPreviousStaticEditorLineByUri(resource: vscode.Uri) {
const scrollLoc = this.previousStaticEditorInfo.get(resource.toString());
return scrollLoc?.line;
}
private updateLine(
resource: vscode.Uri,
@@ -91,18 +120,3 @@ export function getVisibleLine(
const progress = firstVisiblePosition.character / (line.text.length + 2);
return lineNumber + progress;
}
/**
* Change the top-most visible line of `editor` to be at `line`
*/
export function scrollEditorToLine(
line: number,
editor: vscode.TextEditor
) {
const sourceLine = Math.floor(line);
const fraction = line - sourceLine;
const text = editor.document.lineAt(sourceLine).text;
const start = Math.floor(fraction * text.length);
editor.revealRange(
new vscode.Range(sourceLine, start, sourceLine + 1, 0),
vscode.TextEditorRevealType.AtTop);
}