mirror of
https://git.proxmox.com/git/mirror_xterm.js
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682 lines
22 KiB
TypeScript
682 lines
22 KiB
TypeScript
/**
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* @license MIT
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*/
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import { CharMeasure } from './utils/CharMeasure';
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import { CircularList } from './utils/CircularList';
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import { EventEmitter } from './EventEmitter';
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import * as Mouse from './utils/Mouse';
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import { ITerminal } from './Interfaces';
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import { SelectionModel } from './SelectionModel';
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/**
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* The number of pixels the mouse needs to be above or below the viewport in
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* order to scroll at the maximum speed.
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*/
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const DRAG_SCROLL_MAX_THRESHOLD = 50;
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/**
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* The maximum scrolling speed
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*/
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const DRAG_SCROLL_MAX_SPEED = 15;
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/**
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* The number of milliseconds between drag scroll updates.
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*/
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const DRAG_SCROLL_INTERVAL = 50;
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/**
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* The amount of time before mousedown events are no longer stacked to create
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* double/triple click events.
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*/
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const CLEAR_MOUSE_DOWN_TIME = 400;
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/**
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* The number of pixels in each direction that the mouse must move before
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* mousedown events are no longer stacked to create double/triple click events.
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*/
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const CLEAR_MOUSE_DISTANCE = 10;
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// TODO: Move these constants elsewhere, they belong in a buffer or buffer
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// data/line class.
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const LINE_DATA_CHAR_INDEX = 1;
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const LINE_DATA_WIDTH_INDEX = 2;
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const NON_BREAKING_SPACE_CHAR = String.fromCharCode(160);
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const ALL_NON_BREAKING_SPACE_REGEX = new RegExp(NON_BREAKING_SPACE_CHAR, 'g');
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interface IWordPosition {
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start: number;
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length: number;
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}
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/**
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* A class that manages the selection of the terminal. With help from
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* SelectionModel, SelectionManager handles with all logic associated with
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* dealing with the selection, including handling mouse interaction, wide
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* characters and fetching the actual text within the selection. Rendering is
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* not handled by the SelectionManager but a 'refresh' event is fired when the
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* selection is ready to be redrawn.
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*/
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export class SelectionManager extends EventEmitter {
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protected _model: SelectionModel;
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/**
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* The amount to scroll every drag scroll update (depends on how far the mouse
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* drag is above or below the terminal).
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*/
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private _dragScrollAmount: number;
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/**
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* The last time the mousedown event fired, this is used to track double and
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* triple clicks.
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*/
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private _lastMouseDownTime: number;
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/**
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* The last position the mouse was clicked [x, y].
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*/
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private _lastMousePosition: [number, number];
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/**
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* The number of clicks of the mousedown event. This is used to keep track of
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* double and triple clicks.
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*/
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private _clickCount: number;
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/**
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* Whether line select mode is active, this occurs after a triple click.
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*/
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private _isLineSelectModeActive: boolean;
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/**
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* Whether word select mode is active, this occurs after a double click.
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*/
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private _isWordSelectModeActive: boolean;
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/**
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* A setInterval timer that is active while the mouse is down whose callback
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* scrolls the viewport when necessary.
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*/
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private _dragScrollIntervalTimer: NodeJS.Timer;
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/**
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* The animation frame ID used for refreshing the selection.
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*/
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private _refreshAnimationFrame: number;
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private _bufferTrimListener: any;
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private _mouseMoveListener: EventListener;
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private _mouseDownListener: EventListener;
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private _mouseUpListener: EventListener;
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constructor(
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private _terminal: ITerminal,
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private _buffer: CircularList<any>,
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private _rowContainer: HTMLElement,
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private _charMeasure: CharMeasure
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) {
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super();
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this._initListeners();
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this.enable();
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this._model = new SelectionModel(_terminal);
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this._lastMouseDownTime = 0;
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this._isLineSelectModeActive = false;
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this._isWordSelectModeActive = false;
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}
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/**
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* Initializes listener variables.
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*/
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private _initListeners() {
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this._bufferTrimListener = (amount: number) => this._onTrim(amount);
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this._mouseMoveListener = event => this._onMouseMove(<MouseEvent>event);
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this._mouseDownListener = event => this._onMouseDown(<MouseEvent>event);
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this._mouseUpListener = event => this._onMouseUp(<MouseEvent>event);
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}
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/**
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* Disables the selection manager. This is useful for when terminal mouse
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* are enabled.
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*/
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public disable() {
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this.clearSelection();
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this._buffer.off('trim', this._bufferTrimListener);
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this._rowContainer.removeEventListener('mousedown', this._mouseDownListener);
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}
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/**
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* Enable the selection manager.
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*/
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public enable() {
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// Only adjust the selection on trim, shiftElements is rarely used (only in
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// reverseIndex) and delete in a splice is only ever used when the same
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// number of elements was just added. Given this is could actually be
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// beneficial to leave the selection as is for these cases.
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this._buffer.on('trim', this._bufferTrimListener);
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this._rowContainer.addEventListener('mousedown', this._mouseDownListener);
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}
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/**
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* Sets the active buffer, this should be called when the alt buffer is
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* switched in or out.
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* @param buffer The active buffer.
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*/
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public setBuffer(buffer: CircularList<any>): void {
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this._buffer = buffer;
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}
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/**
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* Gets whether there is an active text selection.
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*/
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public get hasSelection(): boolean {
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return !!this._model.finalSelectionStart && !!this._model.finalSelectionEnd;
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}
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/**
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* Gets the text currently selected.
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*/
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public get selectionText(): string {
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const start = this._model.finalSelectionStart;
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const end = this._model.finalSelectionEnd;
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if (!start || !end) {
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return '';
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}
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// Get first row
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const startRowEndCol = start[1] === end[1] ? end[0] : null;
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let result: string[] = [];
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result.push(this._translateBufferLineToString(this._buffer.get(start[1]), true, start[0], startRowEndCol));
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// Get middle rows
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for (let i = start[1] + 1; i <= end[1] - 1; i++) {
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const bufferLine = this._buffer.get(i);
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const lineText = this._translateBufferLineToString(bufferLine, true);
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if (bufferLine.isWrapped) {
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result[result.length - 1] += lineText;
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} else {
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result.push(lineText);
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}
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}
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// Get final row
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if (start[1] !== end[1]) {
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const bufferLine = this._buffer.get(end[1]);
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const lineText = this._translateBufferLineToString(bufferLine, true, 0, end[0]);
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if (bufferLine.isWrapped) {
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result[result.length - 1] += lineText;
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} else {
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result.push(lineText);
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}
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}
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// Format string by replacing non-breaking space chars with regular spaces
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// and joining the array into a multi-line string.
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const formattedResult = result.map(line => {
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return line.replace(ALL_NON_BREAKING_SPACE_REGEX, ' ');
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}).join('\n');
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return formattedResult;
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}
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/**
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* Clears the current terminal selection.
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*/
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public clearSelection(): void {
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this._model.clearSelection();
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this._removeMouseDownListeners();
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this.refresh();
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}
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/**
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* Translates a buffer line to a string, with optional start and end columns.
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* Wide characters will count as two columns in the resulting string. This
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* function is useful for getting the actual text underneath the raw selection
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* position.
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* @param line The line being translated.
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* @param trimRight Whether to trim whitespace to the right.
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* @param startCol The column to start at.
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* @param endCol The column to end at.
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*/
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private _translateBufferLineToString(line: any, trimRight: boolean, startCol: number = 0, endCol: number = null): string {
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// TODO: This function should live in a buffer or buffer line class
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// Get full line
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let lineString = '';
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let widthAdjustedStartCol = startCol;
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let widthAdjustedEndCol = endCol;
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for (let i = 0; i < line.length; i++) {
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const char = line[i];
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lineString += char[LINE_DATA_CHAR_INDEX];
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// Adjust start and end cols for wide characters if they affect their
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// column indexes
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if (char[LINE_DATA_WIDTH_INDEX] === 0) {
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if (startCol >= i) {
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widthAdjustedStartCol--;
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}
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if (endCol >= i) {
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widthAdjustedEndCol--;
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}
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}
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}
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// Calculate the final end col by trimming whitespace on the right of the
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// line if needed.
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let finalEndCol = widthAdjustedEndCol || line.length;
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if (trimRight) {
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const rightWhitespaceIndex = lineString.search(/\s+$/);
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if (rightWhitespaceIndex !== -1) {
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finalEndCol = Math.min(finalEndCol, rightWhitespaceIndex);
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}
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// Return the empty string if only trimmed whitespace is selected
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if (finalEndCol <= widthAdjustedStartCol) {
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return '';
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}
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}
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return lineString.substring(widthAdjustedStartCol, finalEndCol);
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}
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/**
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* Queues a refresh, redrawing the selection on the next opportunity.
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*/
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public refresh(): void {
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if (!this._refreshAnimationFrame) {
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this._refreshAnimationFrame = window.requestAnimationFrame(() => this._refresh());
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}
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}
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/**
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* Fires the refresh event, causing consumers to pick it up and redraw the
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* selection state.
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*/
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private _refresh(): void {
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this._refreshAnimationFrame = null;
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this.emit('refresh', { start: this._model.finalSelectionStart, end: this._model.finalSelectionEnd });
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}
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/**
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* Selects all text within the terminal.
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*/
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public selectAll(): void {
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this._model.isSelectAllActive = true;
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this.refresh();
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}
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/**
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* Handle the buffer being trimmed, adjust the selection position.
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* @param amount The amount the buffer is being trimmed.
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*/
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private _onTrim(amount: number) {
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const needsRefresh = this._model.onTrim(amount);
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if (needsRefresh) {
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this.refresh();
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}
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}
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/**
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* Gets the 0-based [x, y] buffer coordinates of the current mouse event.
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* @param event The mouse event.
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*/
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private _getMouseBufferCoords(event: MouseEvent): [number, number] {
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const coords = Mouse.getCoords(event, this._rowContainer, this._charMeasure, this._terminal.cols, this._terminal.rows);
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// Convert to 0-based
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coords[0]--;
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coords[1]--;
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// Convert viewport coords to buffer coords
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coords[1] += this._terminal.ydisp;
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return coords;
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}
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/**
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* Gets the amount the viewport should be scrolled based on how far out of the
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* terminal the mouse is.
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* @param event The mouse event.
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*/
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private _getMouseEventScrollAmount(event: MouseEvent): number {
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let offset = Mouse.getCoordsRelativeToElement(event, this._rowContainer)[1];
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const terminalHeight = this._terminal.rows * this._charMeasure.height;
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if (offset >= 0 && offset <= terminalHeight) {
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return 0;
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}
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if (offset > terminalHeight) {
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offset -= terminalHeight;
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}
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offset = Math.min(Math.max(offset, -DRAG_SCROLL_MAX_THRESHOLD), DRAG_SCROLL_MAX_THRESHOLD);
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offset /= DRAG_SCROLL_MAX_THRESHOLD;
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return (offset / Math.abs(offset)) + Math.round(offset * (DRAG_SCROLL_MAX_SPEED - 1));
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}
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/**
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* Handles te mousedown event, setting up for a new selection.
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* @param event The mousedown event.
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*/
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private _onMouseDown(event: MouseEvent) {
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// Only action the primary button
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if (event.button !== 0) {
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return;
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}
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// Tell the browser not to start a regular selection
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event.preventDefault();
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// Reset drag scroll state
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this._dragScrollAmount = 0;
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this._setMouseClickCount(event);
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if (event.shiftKey) {
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this._onShiftClick(event);
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} else {
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if (this._clickCount === 1) {
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this._onSingleClick(event);
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} else if (this._clickCount === 2) {
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this._onDoubleClick(event);
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} else if (this._clickCount === 3) {
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this._onTripleClick(event);
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}
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}
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this._addMouseDownListeners();
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this.refresh();
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}
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/**
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* Adds listeners when mousedown is triggered.
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*/
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private _addMouseDownListeners(): void {
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// Listen on the document so that dragging outside of viewport works
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this._rowContainer.ownerDocument.addEventListener('mousemove', this._mouseMoveListener);
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this._rowContainer.ownerDocument.addEventListener('mouseup', this._mouseUpListener);
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this._dragScrollIntervalTimer = setInterval(() => this._dragScroll(), DRAG_SCROLL_INTERVAL);
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}
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/**
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* Removes the listeners that are registered when mousedown is triggered.
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*/
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private _removeMouseDownListeners(): void {
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this._rowContainer.ownerDocument.removeEventListener('mousemove', this._mouseMoveListener);
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this._rowContainer.ownerDocument.removeEventListener('mouseup', this._mouseUpListener);
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clearInterval(this._dragScrollIntervalTimer);
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this._dragScrollIntervalTimer = null;
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}
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/**
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* Performs a shift click, setting the selection end position to the mouse
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* position.
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* @param event The mouse event.
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*/
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private _onShiftClick(event: MouseEvent): void {
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if (this._model.selectionStart) {
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this._model.selectionEnd = this._getMouseBufferCoords(event);
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}
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}
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/**
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* Performs a single click, resetting relevant state and setting the selection
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* start position.
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* @param event The mouse event.
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*/
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private _onSingleClick(event: MouseEvent): void {
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this._model.selectionStartLength = 0;
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this._model.isSelectAllActive = false;
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this._isLineSelectModeActive = false;
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this._isWordSelectModeActive = false;
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this._model.selectionStart = this._getMouseBufferCoords(event);
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if (this._model.selectionStart) {
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this._model.selectionEnd = null;
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// If the mouse is over the second half of a wide character, adjust the
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// selection to cover the whole character
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const char = this._buffer.get(this._model.selectionStart[1])[this._model.selectionStart[0]];
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if (char[LINE_DATA_WIDTH_INDEX] === 0) {
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this._model.selectionStart[0]++;
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}
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}
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}
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/**
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* Performs a double click, selecting the current work.
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* @param event The mouse event.
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*/
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private _onDoubleClick(event: MouseEvent): void {
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const coords = this._getMouseBufferCoords(event);
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if (coords) {
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this._isWordSelectModeActive = true;
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this._selectWordAt(coords);
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}
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}
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/**
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* Performs a triple click, selecting the current line and activating line
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* select mode.
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* @param event The mouse event.
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*/
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private _onTripleClick(event: MouseEvent): void {
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const coords = this._getMouseBufferCoords(event);
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if (coords) {
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this._isLineSelectModeActive = true;
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this._selectLineAt(coords[1]);
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}
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}
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/**
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* Sets the number of clicks for the current mousedown event based on the time
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* and position of the last mousedown event.
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* @param event The mouse event.
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*/
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private _setMouseClickCount(event: MouseEvent): void {
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let currentTime = (new Date()).getTime();
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if (currentTime - this._lastMouseDownTime > CLEAR_MOUSE_DOWN_TIME || this._distanceFromLastMousePosition(event) > CLEAR_MOUSE_DISTANCE) {
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this._clickCount = 0;
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}
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this._lastMouseDownTime = currentTime;
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this._lastMousePosition = [event.pageX, event.pageY];
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this._clickCount++;
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}
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/**
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* Gets the maximum number of pixels in each direction the mouse has moved.
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* @param event The mouse event.
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*/
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private _distanceFromLastMousePosition(event: MouseEvent): number {
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const result = Math.max(
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Math.abs(this._lastMousePosition[0] - event.pageX),
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Math.abs(this._lastMousePosition[1] - event.pageY));
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return result;
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}
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/**
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* Handles the mousemove event when the mouse button is down, recording the
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* end of the selection and refreshing the selection.
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* @param event The mousemove event.
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*/
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private _onMouseMove(event: MouseEvent) {
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// Record the previous position so we know whether to redraw the selection
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// at the end.
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const previousSelectionEnd = this._model.selectionEnd ? [this._model.selectionEnd[0], this._model.selectionEnd[1]] : null;
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// Set the initial selection end based on the mouse coordinates
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this._model.selectionEnd = this._getMouseBufferCoords(event);
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// Select the entire line if line select mode is active.
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if (this._isLineSelectModeActive) {
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if (this._model.selectionEnd[1] < this._model.selectionStart[1]) {
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this._model.selectionEnd[0] = 0;
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} else {
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this._model.selectionEnd[0] = this._terminal.cols;
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}
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}
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if (this._isWordSelectModeActive) {
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this._selectToWordAt(this._model.selectionEnd);
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}
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// Determine the amount of scrolling that will happen.
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this._dragScrollAmount = this._getMouseEventScrollAmount(event);
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// If the cursor was above or below the viewport, make sure it's at the
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// start or end of the viewport respectively.
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if (this._dragScrollAmount > 0) {
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this._model.selectionEnd[0] = this._terminal.cols - 1;
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} else if (this._dragScrollAmount < 0) {
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this._model.selectionEnd[0] = 0;
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}
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// If the character is a wide character include the cell to the right in the
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// selection. Note that selections at the very end of the line will never
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// have a character.
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if (this._model.selectionEnd[1] < this._buffer.length) {
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const char = this._buffer.get(this._model.selectionEnd[1])[this._model.selectionEnd[0]];
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if (char && char[2] === 0) {
|
|
this._model.selectionEnd[0]++;
|
|
}
|
|
}
|
|
|
|
// Only draw here if the selection changes.
|
|
if (!previousSelectionEnd ||
|
|
previousSelectionEnd[0] !== this._model.selectionEnd[0] ||
|
|
previousSelectionEnd[1] !== this._model.selectionEnd[1]) {
|
|
this.refresh();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* The callback that occurs every DRAG_SCROLL_INTERVAL ms that does the
|
|
* scrolling of the viewport.
|
|
*/
|
|
private _dragScroll() {
|
|
if (this._dragScrollAmount) {
|
|
this._terminal.scrollDisp(this._dragScrollAmount, false);
|
|
// Re-evaluate selection
|
|
if (this._dragScrollAmount > 0) {
|
|
this._model.selectionEnd = [this._terminal.cols - 1, this._terminal.ydisp + this._terminal.rows];
|
|
} else {
|
|
this._model.selectionEnd = [0, this._terminal.ydisp];
|
|
}
|
|
this.refresh();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Handles the mouseup event, removing the mousedown listeners.
|
|
* @param event The mouseup event.
|
|
*/
|
|
private _onMouseUp(event: MouseEvent) {
|
|
this._removeMouseDownListeners();
|
|
}
|
|
|
|
/**
|
|
* Converts a viewport column to the character index on the buffer line, the
|
|
* latter takes into account wide characters.
|
|
* @param coords The coordinates to find the 2 index for.
|
|
*/
|
|
private _convertViewportColToCharacterIndex(bufferLine: any, coords: [number, number]): number {
|
|
let charIndex = coords[0];
|
|
for (let i = 0; coords[0] >= i; i++) {
|
|
const char = bufferLine[i];
|
|
if (char[LINE_DATA_WIDTH_INDEX] === 0) {
|
|
charIndex--;
|
|
}
|
|
}
|
|
return charIndex;
|
|
}
|
|
|
|
/**
|
|
* Gets positional information for the word at the coordinated specified.
|
|
* @param coords The coordinates to get the word at.
|
|
*/
|
|
private _getWordAt(coords: [number, number]): IWordPosition {
|
|
const bufferLine = this._buffer.get(coords[1]);
|
|
const line = this._translateBufferLineToString(bufferLine, false);
|
|
|
|
// Get actual index, taking into consideration wide characters
|
|
let endIndex = this._convertViewportColToCharacterIndex(bufferLine, coords);
|
|
let startIndex = endIndex;
|
|
|
|
// Record offset to be used later
|
|
const charOffset = coords[0] - startIndex;
|
|
let leftWideCharCount = 0;
|
|
let rightWideCharCount = 0;
|
|
|
|
if (line.charAt(startIndex) === ' ') {
|
|
// Expand until non-whitespace is hit
|
|
while (startIndex > 0 && line.charAt(startIndex - 1) === ' ') {
|
|
startIndex--;
|
|
}
|
|
while (endIndex < line.length && line.charAt(endIndex + 1) === ' ') {
|
|
endIndex++;
|
|
}
|
|
} else {
|
|
// Expand until whitespace is hit. This algorithm works by scanning left
|
|
// and right from the starting position, keeping both the index format
|
|
// (line) and the column format (bufferLine) in sync. When a wide
|
|
// character is hit, it is recorded and the column index is adjusted.
|
|
let startCol = coords[0];
|
|
let endCol = coords[0];
|
|
// Consider the initial position, skip it and increment the wide char
|
|
// variable
|
|
if (bufferLine[startCol][LINE_DATA_WIDTH_INDEX] === 0) {
|
|
leftWideCharCount++;
|
|
startCol--;
|
|
}
|
|
if (bufferLine[endCol][LINE_DATA_WIDTH_INDEX] === 2) {
|
|
rightWideCharCount++;
|
|
endCol++;
|
|
}
|
|
// Expand the string in both directions until a space is hit
|
|
while (startIndex > 0 && line.charAt(startIndex - 1) !== ' ') {
|
|
if (bufferLine[startCol - 1][LINE_DATA_WIDTH_INDEX] === 0) {
|
|
// If the next character is a wide char, record it and skip the column
|
|
leftWideCharCount++;
|
|
startCol--;
|
|
}
|
|
startIndex--;
|
|
startCol--;
|
|
}
|
|
while (endIndex + 1 < line.length && line.charAt(endIndex + 1) !== ' ') {
|
|
if (bufferLine[endCol + 1][LINE_DATA_WIDTH_INDEX] === 2) {
|
|
// If the next character is a wide char, record it and skip the column
|
|
rightWideCharCount++;
|
|
endCol++;
|
|
}
|
|
endIndex++;
|
|
endCol++;
|
|
}
|
|
}
|
|
|
|
const start = startIndex + charOffset - leftWideCharCount;
|
|
const length = Math.min(endIndex - startIndex + leftWideCharCount + rightWideCharCount + 1/*include endIndex char*/, this._terminal.cols);
|
|
return {start, length};
|
|
}
|
|
|
|
/**
|
|
* Selects the word at the coordinates specified.
|
|
* @param coords The coordinates to get the word at.
|
|
*/
|
|
protected _selectWordAt(coords: [number, number]): void {
|
|
const wordPosition = this._getWordAt(coords);
|
|
this._model.selectionStart = [wordPosition.start, coords[1]];
|
|
this._model.selectionStartLength = wordPosition.length;
|
|
}
|
|
|
|
/**
|
|
* Sets the selection end to the word at the coordinated specified.
|
|
* @param coords The coordinates to get the word at.
|
|
*/
|
|
private _selectToWordAt(coords: [number, number]): void {
|
|
const wordPosition = this._getWordAt(coords);
|
|
this._model.selectionEnd = [this._model.areSelectionValuesReversed() ? wordPosition.start : (wordPosition.start + wordPosition.length), coords[1]];
|
|
}
|
|
|
|
/**
|
|
* Selects the line specified.
|
|
* @param line The line index.
|
|
*/
|
|
protected _selectLineAt(line: number): void {
|
|
this._model.selectionStart = [0, line];
|
|
this._model.selectionStartLength = this._terminal.cols;
|
|
}
|
|
}
|