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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { FastDomNode, createFastDomNode } from 'vs/base/browser/fastDomNode';
import { IStringBuilder, createStringBuilder } from 'vs/editor/common/core/stringBuilder';
import * as viewEvents from 'vs/editor/common/view/viewEvents';
import { ViewportData } from 'vs/editor/common/viewLayout/viewLinesViewportData';
import { EditorOption } from 'vs/editor/common/config/editorOptions';
/**
* Represents a visible line
*/
export interface IVisibleLine extends ILine {
getDomNode(): HTMLElement | null;
setDomNode(domNode: HTMLElement): void;
/**
* Return null if the HTML should not be touched.
* Return the new HTML otherwise.
*/
renderLine(lineNumber: number, deltaTop: number, viewportData: ViewportData, sb: IStringBuilder): boolean;
/**
* Layout the line.
*/
layoutLine(lineNumber: number, deltaTop: number): void;
}
export interface ILine {
onContentChanged(): void;
onTokensChanged(): void;
}
export class RenderedLinesCollection<T extends ILine> {
private readonly _createLine: () => T;
private _lines!: T[];
private _rendLineNumberStart!: number;
constructor(createLine: () => T) {
this._createLine = createLine;
this._set(1, []);
}
public flush(): void {
this._set(1, []);
}
_set(rendLineNumberStart: number, lines: T[]): void {
this._lines = lines;
this._rendLineNumberStart = rendLineNumberStart;
}
_get(): { rendLineNumberStart: number; lines: T[]; } {
return {
rendLineNumberStart: this._rendLineNumberStart,
lines: this._lines
};
}
/**
* @returns Inclusive line number that is inside this collection
*/
public getStartLineNumber(): number {
return this._rendLineNumberStart;
}
/**
* @returns Inclusive line number that is inside this collection
*/
public getEndLineNumber(): number {
return this._rendLineNumberStart + this._lines.length - 1;
}
public getCount(): number {
return this._lines.length;
}
public getLine(lineNumber: number): T {
const lineIndex = lineNumber - this._rendLineNumberStart;
if (lineIndex < 0 || lineIndex >= this._lines.length) {
throw new Error('Illegal value for lineNumber');
}
return this._lines[lineIndex];
}
/**
* @returns Lines that were removed from this collection
*/
public onLinesDeleted(deleteFromLineNumber: number, deleteToLineNumber: number): T[] | null {
if (this.getCount() === 0) {
// no lines
return null;
}
const startLineNumber = this.getStartLineNumber();
const endLineNumber = this.getEndLineNumber();
if (deleteToLineNumber < startLineNumber) {
// deleting above the viewport
const deleteCnt = deleteToLineNumber - deleteFromLineNumber + 1;
this._rendLineNumberStart -= deleteCnt;
return null;
}
if (deleteFromLineNumber > endLineNumber) {
// deleted below the viewport
return null;
}
// Record what needs to be deleted
let deleteStartIndex = 0;
let deleteCount = 0;
for (let lineNumber = startLineNumber; lineNumber <= endLineNumber; lineNumber++) {
const lineIndex = lineNumber - this._rendLineNumberStart;
if (deleteFromLineNumber <= lineNumber && lineNumber <= deleteToLineNumber) {
// this is a line to be deleted
if (deleteCount === 0) {
// this is the first line to be deleted
deleteStartIndex = lineIndex;
deleteCount = 1;
} else {
deleteCount++;
}
}
}
// Adjust this._rendLineNumberStart for lines deleted above
if (deleteFromLineNumber < startLineNumber) {
// Something was deleted above
let deleteAboveCount = 0;
if (deleteToLineNumber < startLineNumber) {
// the entire deleted lines are above
deleteAboveCount = deleteToLineNumber - deleteFromLineNumber + 1;
} else {
deleteAboveCount = startLineNumber - deleteFromLineNumber;
}
this._rendLineNumberStart -= deleteAboveCount;
}
const deleted = this._lines.splice(deleteStartIndex, deleteCount);
return deleted;
}
public onLinesChanged(changeFromLineNumber: number, changeToLineNumber: number): boolean {
if (this.getCount() === 0) {
// no lines
return false;
}
const startLineNumber = this.getStartLineNumber();
const endLineNumber = this.getEndLineNumber();
let someoneNotified = false;
for (let changedLineNumber = changeFromLineNumber; changedLineNumber <= changeToLineNumber; changedLineNumber++) {
if (changedLineNumber >= startLineNumber && changedLineNumber <= endLineNumber) {
// Notify the line
this._lines[changedLineNumber - this._rendLineNumberStart].onContentChanged();
someoneNotified = true;
}
}
return someoneNotified;
}
public onLinesInserted(insertFromLineNumber: number, insertToLineNumber: number): T[] | null {
if (this.getCount() === 0) {
// no lines
return null;
}
const insertCnt = insertToLineNumber - insertFromLineNumber + 1;
const startLineNumber = this.getStartLineNumber();
const endLineNumber = this.getEndLineNumber();
if (insertFromLineNumber <= startLineNumber) {
// inserting above the viewport
this._rendLineNumberStart += insertCnt;
return null;
}
if (insertFromLineNumber > endLineNumber) {
// inserting below the viewport
return null;
}
if (insertCnt + insertFromLineNumber > endLineNumber) {
// insert inside the viewport in such a way that all remaining lines are pushed outside
const deleted = this._lines.splice(insertFromLineNumber - this._rendLineNumberStart, endLineNumber - insertFromLineNumber + 1);
return deleted;
}
// insert inside the viewport, push out some lines, but not all remaining lines
const newLines: T[] = [];
for (let i = 0; i < insertCnt; i++) {
newLines[i] = this._createLine();
}
const insertIndex = insertFromLineNumber - this._rendLineNumberStart;
const beforeLines = this._lines.slice(0, insertIndex);
const afterLines = this._lines.slice(insertIndex, this._lines.length - insertCnt);
const deletedLines = this._lines.slice(this._lines.length - insertCnt, this._lines.length);
this._lines = beforeLines.concat(newLines).concat(afterLines);
return deletedLines;
}
public onTokensChanged(ranges: { fromLineNumber: number; toLineNumber: number; }[]): boolean {
if (this.getCount() === 0) {
// no lines
return false;
}
const startLineNumber = this.getStartLineNumber();
const endLineNumber = this.getEndLineNumber();
let notifiedSomeone = false;
for (let i = 0, len = ranges.length; i < len; i++) {
const rng = ranges[i];
if (rng.toLineNumber < startLineNumber || rng.fromLineNumber > endLineNumber) {
// range outside viewport
continue;
}
const from = Math.max(startLineNumber, rng.fromLineNumber);
const to = Math.min(endLineNumber, rng.toLineNumber);
for (let lineNumber = from; lineNumber <= to; lineNumber++) {
const lineIndex = lineNumber - this._rendLineNumberStart;
this._lines[lineIndex].onTokensChanged();
notifiedSomeone = true;
}
}
return notifiedSomeone;
}
}
export interface IVisibleLinesHost<T extends IVisibleLine> {
createVisibleLine(): T;
}
export class VisibleLinesCollection<T extends IVisibleLine> {
private readonly _host: IVisibleLinesHost<T>;
public readonly domNode: FastDomNode<HTMLElement>;
private readonly _linesCollection: RenderedLinesCollection<T>;
constructor(host: IVisibleLinesHost<T>) {
this._host = host;
this.domNode = this._createDomNode();
this._linesCollection = new RenderedLinesCollection<T>(() => this._host.createVisibleLine());
}
private _createDomNode(): FastDomNode<HTMLElement> {
const domNode = createFastDomNode(document.createElement('div'));
domNode.setClassName('view-layer');
domNode.setPosition('absolute');
domNode.domNode.setAttribute('role', 'presentation');
domNode.domNode.setAttribute('aria-hidden', 'true');
return domNode;
}
// ---- begin view event handlers
public onConfigurationChanged(e: viewEvents.ViewConfigurationChangedEvent): boolean {
if (e.hasChanged(EditorOption.layoutInfo)) {
return true;
}
return false;
}
public onFlushed(e: viewEvents.ViewFlushedEvent): boolean {
this._linesCollection.flush();
// No need to clear the dom node because a full .innerHTML will occur in ViewLayerRenderer._render
return true;
}
public onLinesChanged(e: viewEvents.ViewLinesChangedEvent): boolean {
return this._linesCollection.onLinesChanged(e.fromLineNumber, e.toLineNumber);
}
public onLinesDeleted(e: viewEvents.ViewLinesDeletedEvent): boolean {
const deleted = this._linesCollection.onLinesDeleted(e.fromLineNumber, e.toLineNumber);
if (deleted) {
// Remove from DOM
for (let i = 0, len = deleted.length; i < len; i++) {
const lineDomNode = deleted[i].getDomNode();
if (lineDomNode) {
this.domNode.domNode.removeChild(lineDomNode);
}
}
}
return true;
}
public onLinesInserted(e: viewEvents.ViewLinesInsertedEvent): boolean {
const deleted = this._linesCollection.onLinesInserted(e.fromLineNumber, e.toLineNumber);
if (deleted) {
// Remove from DOM
for (let i = 0, len = deleted.length; i < len; i++) {
const lineDomNode = deleted[i].getDomNode();
if (lineDomNode) {
this.domNode.domNode.removeChild(lineDomNode);
}
}
}
return true;
}
public onScrollChanged(e: viewEvents.ViewScrollChangedEvent): boolean {
return e.scrollTopChanged;
}
public onTokensChanged(e: viewEvents.ViewTokensChangedEvent): boolean {
return this._linesCollection.onTokensChanged(e.ranges);
}
public onZonesChanged(e: viewEvents.ViewZonesChangedEvent): boolean {
return true;
}
// ---- end view event handlers
public getStartLineNumber(): number {
return this._linesCollection.getStartLineNumber();
}
public getEndLineNumber(): number {
return this._linesCollection.getEndLineNumber();
}
public getVisibleLine(lineNumber: number): T {
return this._linesCollection.getLine(lineNumber);
}
public renderLines(viewportData: ViewportData): void {
const inp = this._linesCollection._get();
const renderer = new ViewLayerRenderer<T>(this.domNode.domNode, this._host, viewportData);
const ctx: IRendererContext<T> = {
rendLineNumberStart: inp.rendLineNumberStart,
lines: inp.lines,
linesLength: inp.lines.length
};
// Decide if this render will do a single update (single large .innerHTML) or many updates (inserting/removing dom nodes)
const resCtx = renderer.render(ctx, viewportData.startLineNumber, viewportData.endLineNumber, viewportData.relativeVerticalOffset);
this._linesCollection._set(resCtx.rendLineNumberStart, resCtx.lines);
}
}
interface IRendererContext<T extends IVisibleLine> {
rendLineNumberStart: number;
lines: T[];
linesLength: number;
}
class ViewLayerRenderer<T extends IVisibleLine> {
readonly domNode: HTMLElement;
readonly host: IVisibleLinesHost<T>;
readonly viewportData: ViewportData;
constructor(domNode: HTMLElement, host: IVisibleLinesHost<T>, viewportData: ViewportData) {
this.domNode = domNode;
this.host = host;
this.viewportData = viewportData;
}
public render(inContext: IRendererContext<T>, startLineNumber: number, stopLineNumber: number, deltaTop: number[]): IRendererContext<T> {
const ctx: IRendererContext<T> = {
rendLineNumberStart: inContext.rendLineNumberStart,
lines: inContext.lines.slice(0),
linesLength: inContext.linesLength
};
if ((ctx.rendLineNumberStart + ctx.linesLength - 1 < startLineNumber) || (stopLineNumber < ctx.rendLineNumberStart)) {
// There is no overlap whatsoever
ctx.rendLineNumberStart = startLineNumber;
ctx.linesLength = stopLineNumber - startLineNumber + 1;
ctx.lines = [];
for (let x = startLineNumber; x <= stopLineNumber; x++) {
ctx.lines[x - startLineNumber] = this.host.createVisibleLine();
}
this._finishRendering(ctx, true, deltaTop);
return ctx;
}
// Update lines which will remain untouched
this._renderUntouchedLines(
ctx,
Math.max(startLineNumber - ctx.rendLineNumberStart, 0),
Math.min(stopLineNumber - ctx.rendLineNumberStart, ctx.linesLength - 1),
deltaTop,
startLineNumber
);
if (ctx.rendLineNumberStart > startLineNumber) {
// Insert lines before
const fromLineNumber = startLineNumber;
const toLineNumber = Math.min(stopLineNumber, ctx.rendLineNumberStart - 1);
if (fromLineNumber <= toLineNumber) {
this._insertLinesBefore(ctx, fromLineNumber, toLineNumber, deltaTop, startLineNumber);
ctx.linesLength += toLineNumber - fromLineNumber + 1;
}
} else if (ctx.rendLineNumberStart < startLineNumber) {
// Remove lines before
const removeCnt = Math.min(ctx.linesLength, startLineNumber - ctx.rendLineNumberStart);
if (removeCnt > 0) {
this._removeLinesBefore(ctx, removeCnt);
ctx.linesLength -= removeCnt;
}
}
ctx.rendLineNumberStart = startLineNumber;
if (ctx.rendLineNumberStart + ctx.linesLength - 1 < stopLineNumber) {
// Insert lines after
const fromLineNumber = ctx.rendLineNumberStart + ctx.linesLength;
const toLineNumber = stopLineNumber;
if (fromLineNumber <= toLineNumber) {
this._insertLinesAfter(ctx, fromLineNumber, toLineNumber, deltaTop, startLineNumber);
ctx.linesLength += toLineNumber - fromLineNumber + 1;
}
} else if (ctx.rendLineNumberStart + ctx.linesLength - 1 > stopLineNumber) {
// Remove lines after
const fromLineNumber = Math.max(0, stopLineNumber - ctx.rendLineNumberStart + 1);
const toLineNumber = ctx.linesLength - 1;
const removeCnt = toLineNumber - fromLineNumber + 1;
if (removeCnt > 0) {
this._removeLinesAfter(ctx, removeCnt);
ctx.linesLength -= removeCnt;
}
}
this._finishRendering(ctx, false, deltaTop);
return ctx;
}
private _renderUntouchedLines(ctx: IRendererContext<T>, startIndex: number, endIndex: number, deltaTop: number[], deltaLN: number): void {
const rendLineNumberStart = ctx.rendLineNumberStart;
const lines = ctx.lines;
for (let i = startIndex; i <= endIndex; i++) {
const lineNumber = rendLineNumberStart + i;
lines[i].layoutLine(lineNumber, deltaTop[lineNumber - deltaLN]);
}
}
private _insertLinesBefore(ctx: IRendererContext<T>, fromLineNumber: number, toLineNumber: number, deltaTop: number[], deltaLN: number): void {
const newLines: T[] = [];
let newLinesLen = 0;
for (let lineNumber = fromLineNumber; lineNumber <= toLineNumber; lineNumber++) {
newLines[newLinesLen++] = this.host.createVisibleLine();
}
ctx.lines = newLines.concat(ctx.lines);
}
private _removeLinesBefore(ctx: IRendererContext<T>, removeCount: number): void {
for (let i = 0; i < removeCount; i++) {
const lineDomNode = ctx.lines[i].getDomNode();
if (lineDomNode) {
this.domNode.removeChild(lineDomNode);
}
}
ctx.lines.splice(0, removeCount);
}
private _insertLinesAfter(ctx: IRendererContext<T>, fromLineNumber: number, toLineNumber: number, deltaTop: number[], deltaLN: number): void {
const newLines: T[] = [];
let newLinesLen = 0;
for (let lineNumber = fromLineNumber; lineNumber <= toLineNumber; lineNumber++) {
newLines[newLinesLen++] = this.host.createVisibleLine();
}
ctx.lines = ctx.lines.concat(newLines);
}
private _removeLinesAfter(ctx: IRendererContext<T>, removeCount: number): void {
const removeIndex = ctx.linesLength - removeCount;
for (let i = 0; i < removeCount; i++) {
const lineDomNode = ctx.lines[removeIndex + i].getDomNode();
if (lineDomNode) {
this.domNode.removeChild(lineDomNode);
}
}
ctx.lines.splice(removeIndex, removeCount);
}
private _finishRenderingNewLines(ctx: IRendererContext<T>, domNodeIsEmpty: boolean, newLinesHTML: string, wasNew: boolean[]): void {
const lastChild = <HTMLElement>this.domNode.lastChild;
if (domNodeIsEmpty || !lastChild) {
this.domNode.innerHTML = newLinesHTML;
} else {
lastChild.insertAdjacentHTML('afterend', newLinesHTML);
}
let currChild = <HTMLElement>this.domNode.lastChild;
for (let i = ctx.linesLength - 1; i >= 0; i--) {
const line = ctx.lines[i];
if (wasNew[i]) {
line.setDomNode(currChild);
currChild = <HTMLElement>currChild.previousSibling;
}
}
}
private _finishRenderingInvalidLines(ctx: IRendererContext<T>, invalidLinesHTML: string, wasInvalid: boolean[]): void {
const hugeDomNode = document.createElement('div');
hugeDomNode.innerHTML = invalidLinesHTML;
for (let i = 0; i < ctx.linesLength; i++) {
const line = ctx.lines[i];
if (wasInvalid[i]) {
const source = <HTMLElement>hugeDomNode.firstChild;
const lineDomNode = line.getDomNode()!;
lineDomNode.parentNode!.replaceChild(source, lineDomNode);
line.setDomNode(source);
}
}
}
private static readonly _sb = createStringBuilder(100000);
private _finishRendering(ctx: IRendererContext<T>, domNodeIsEmpty: boolean, deltaTop: number[]): void {
const sb = ViewLayerRenderer._sb;
const linesLength = ctx.linesLength;
const lines = ctx.lines;
const rendLineNumberStart = ctx.rendLineNumberStart;
const wasNew: boolean[] = [];
{
sb.reset();
let hadNewLine = false;
for (let i = 0; i < linesLength; i++) {
const line = lines[i];
wasNew[i] = false;
const lineDomNode = line.getDomNode();
if (lineDomNode) {
// line is not new
continue;
}
const renderResult = line.renderLine(i + rendLineNumberStart, deltaTop[i], this.viewportData, sb);
if (!renderResult) {
// line does not need rendering
continue;
}
wasNew[i] = true;
hadNewLine = true;
}
if (hadNewLine) {
this._finishRenderingNewLines(ctx, domNodeIsEmpty, sb.build(), wasNew);
}
}
{
sb.reset();
let hadInvalidLine = false;
const wasInvalid: boolean[] = [];
for (let i = 0; i < linesLength; i++) {
const line = lines[i];
wasInvalid[i] = false;
if (wasNew[i]) {
// line was new
continue;
}
const renderResult = line.renderLine(i + rendLineNumberStart, deltaTop[i], this.viewportData, sb);
if (!renderResult) {
// line does not need rendering
continue;
}
wasInvalid[i] = true;
hadInvalidLine = true;
}
if (hadInvalidLine) {
this._finishRenderingInvalidLines(ctx, sb.build(), wasInvalid);
}
}
}
}