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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 { findFirstInSorted } from 'vs/base/common/arrays';
import { Emitter, Event } from 'vs/base/common/event';
import { IDisposable } from 'vs/base/common/lifecycle';
import { IRange, Range } from 'vs/editor/common/core/range';
import { Selection } from 'vs/editor/common/core/selection';
import { IModelContentChangedEvent } from 'vs/editor/common/textModelEvents';
import { countEOL } from 'vs/editor/common/core/eolCounter';
import { CollapseMemento, FoldingModel } from 'vs/editor/contrib/folding/browser/foldingModel';
export class HiddenRangeModel {
private readonly _foldingModel: FoldingModel;
private _hiddenRanges: IRange[];
private _foldingModelListener: IDisposable | null;
private readonly _updateEventEmitter = new Emitter<IRange[]>();
private _hasLineChanges: boolean = false;
public get onDidChange(): Event<IRange[]> { return this._updateEventEmitter.event; }
public get hiddenRanges() { return this._hiddenRanges; }
public constructor(model: FoldingModel) {
this._foldingModel = model;
this._foldingModelListener = model.onDidChange(_ => this.updateHiddenRanges());
this._hiddenRanges = [];
if (model.regions.length) {
this.updateHiddenRanges();
}
}
public notifyChangeModelContent(e: IModelContentChangedEvent) {
if (this._hiddenRanges.length && !this._hasLineChanges) {
this._hasLineChanges = e.changes.some(change => {
return change.range.endLineNumber !== change.range.startLineNumber || countEOL(change.text)[0] !== 0;
});
}
}
private updateHiddenRanges(): void {
let updateHiddenAreas = false;
const newHiddenAreas: IRange[] = [];
let i = 0; // index into hidden
let k = 0;
let lastCollapsedStart = Number.MAX_VALUE;
let lastCollapsedEnd = -1;
const ranges = this._foldingModel.regions;
for (; i < ranges.length; i++) {
if (!ranges.isCollapsed(i)) {
continue;
}
const startLineNumber = ranges.getStartLineNumber(i) + 1; // the first line is not hidden
const endLineNumber = ranges.getEndLineNumber(i);
if (lastCollapsedStart <= startLineNumber && endLineNumber <= lastCollapsedEnd) {
// ignore ranges contained in collapsed regions
continue;
}
if (!updateHiddenAreas && k < this._hiddenRanges.length && this._hiddenRanges[k].startLineNumber === startLineNumber && this._hiddenRanges[k].endLineNumber === endLineNumber) {
// reuse the old ranges
newHiddenAreas.push(this._hiddenRanges[k]);
k++;
} else {
updateHiddenAreas = true;
newHiddenAreas.push(new Range(startLineNumber, 1, endLineNumber, 1));
}
lastCollapsedStart = startLineNumber;
lastCollapsedEnd = endLineNumber;
}
if (this._hasLineChanges || updateHiddenAreas || k < this._hiddenRanges.length) {
this.applyHiddenRanges(newHiddenAreas);
}
}
public applyMemento(state: CollapseMemento): boolean {
if (!Array.isArray(state) || state.length === 0) {
return false;
}
const hiddenRanges: IRange[] = [];
for (const r of state) {
if (!r.startLineNumber || !r.endLineNumber) {
return false;
}
hiddenRanges.push(new Range(r.startLineNumber + 1, 1, r.endLineNumber, 1));
}
this.applyHiddenRanges(hiddenRanges);
return true;
}
/**
* Collapse state memento, for persistence only, only used if folding model is not yet initialized
*/
public getMemento(): CollapseMemento {
return this._hiddenRanges.map(r => ({ startLineNumber: r.startLineNumber - 1, endLineNumber: r.endLineNumber }));
}
private applyHiddenRanges(newHiddenAreas: IRange[]) {
this._hiddenRanges = newHiddenAreas;
this._hasLineChanges = false;
this._updateEventEmitter.fire(newHiddenAreas);
}
public hasRanges() {
return this._hiddenRanges.length > 0;
}
public isHidden(line: number): boolean {
return findRange(this._hiddenRanges, line) !== null;
}
public adjustSelections(selections: Selection[]): boolean {
let hasChanges = false;
const editorModel = this._foldingModel.textModel;
let lastRange: IRange | null = null;
const adjustLine = (line: number) => {
if (!lastRange || !isInside(line, lastRange)) {
lastRange = findRange(this._hiddenRanges, line);
}
if (lastRange) {
return lastRange.startLineNumber - 1;
}
return null;
};
for (let i = 0, len = selections.length; i < len; i++) {
let selection = selections[i];
const adjustedStartLine = adjustLine(selection.startLineNumber);
if (adjustedStartLine) {
selection = selection.setStartPosition(adjustedStartLine, editorModel.getLineMaxColumn(adjustedStartLine));
hasChanges = true;
}
const adjustedEndLine = adjustLine(selection.endLineNumber);
if (adjustedEndLine) {
selection = selection.setEndPosition(adjustedEndLine, editorModel.getLineMaxColumn(adjustedEndLine));
hasChanges = true;
}
selections[i] = selection;
}
return hasChanges;
}
public dispose() {
if (this.hiddenRanges.length > 0) {
this._hiddenRanges = [];
this._updateEventEmitter.fire(this._hiddenRanges);
}
if (this._foldingModelListener) {
this._foldingModelListener.dispose();
this._foldingModelListener = null;
}
}
}
function isInside(line: number, range: IRange) {
return line >= range.startLineNumber && line <= range.endLineNumber;
}
function findRange(ranges: IRange[], line: number): IRange | null {
const i = findFirstInSorted(ranges, r => line < r.startLineNumber) - 1;
if (i >= 0 && ranges[i].endLineNumber >= line) {
return ranges[i];
}
return null;
}
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