/
DomRenderer.ts
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/
DomRenderer.ts
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/**
* Copyright (c) 2018 The xterm.js authors. All rights reserved.
* @license MIT
*/
import { IRenderer, IRenderDimensions, IColorSet } from '../Types';
import { ITerminal, CharacterJoinerHandler } from '../../Types';
import { ITheme } from 'xterm';
import { EventEmitter } from '../../common/EventEmitter';
import { ColorManager } from '../ColorManager';
import { RenderDebouncer } from '../../ui/RenderDebouncer';
import { BOLD_CLASS, ITALIC_CLASS, CURSOR_CLASS, CURSOR_STYLE_BLOCK_CLASS, CURSOR_STYLE_BAR_CLASS, CURSOR_STYLE_UNDERLINE_CLASS, DomRendererRowFactory } from './DomRendererRowFactory';
const TERMINAL_CLASS_PREFIX = 'xterm-dom-renderer-owner-';
const ROW_CONTAINER_CLASS = 'xterm-rows';
const FG_CLASS_PREFIX = 'xterm-fg-';
const BG_CLASS_PREFIX = 'xterm-bg-';
const FOCUS_CLASS = 'xterm-focus';
const SELECTION_CLASS = 'xterm-selection';
let nextTerminalId = 1;
// TODO: Pull into an addon when TS composite projects allow easier sharing of code (not just
// interfaces) between core and addons
/**
* A fallback renderer for when canvas is slow. This is not meant to be
* particularly fast or feature complete, more just stable and usable for when
* canvas is not an option.
*/
export class DomRenderer extends EventEmitter implements IRenderer {
private _renderDebouncer: RenderDebouncer;
private _rowFactory: DomRendererRowFactory;
private _terminalClass: number = nextTerminalId++;
private _themeStyleElement: HTMLStyleElement;
private _dimensionsStyleElement: HTMLStyleElement;
private _rowContainer: HTMLElement;
private _rowElements: HTMLElement[] = [];
private _selectionContainer: HTMLElement;
public dimensions: IRenderDimensions;
public colorManager: ColorManager;
constructor(private _terminal: ITerminal, theme: ITheme | undefined) {
super();
const allowTransparency = this._terminal.options.allowTransparency;
this.colorManager = new ColorManager(document, allowTransparency);
this.setTheme(theme);
this._rowContainer = document.createElement('div');
this._rowContainer.classList.add(ROW_CONTAINER_CLASS);
this._rowContainer.style.lineHeight = 'normal';
this._rowContainer.setAttribute('aria-hidden', 'true');
this._refreshRowElements(this._terminal.cols, this._terminal.rows);
this._selectionContainer = document.createElement('div');
this._selectionContainer.classList.add(SELECTION_CLASS);
this._selectionContainer.setAttribute('aria-hidden', 'true');
this.dimensions = {
scaledCharWidth: null,
scaledCharHeight: null,
scaledCellWidth: null,
scaledCellHeight: null,
scaledCharLeft: null,
scaledCharTop: null,
scaledCanvasWidth: null,
scaledCanvasHeight: null,
canvasWidth: null,
canvasHeight: null,
actualCellWidth: null,
actualCellHeight: null
};
this._updateDimensions();
this._renderDebouncer = new RenderDebouncer(this._terminal, this._renderRows.bind(this));
this._rowFactory = new DomRendererRowFactory(document);
this._terminal.element.classList.add(TERMINAL_CLASS_PREFIX + this._terminalClass);
this._terminal.screenElement.appendChild(this._rowContainer);
this._terminal.screenElement.appendChild(this._selectionContainer);
}
public dispose(): void {
this._terminal.element.classList.remove(TERMINAL_CLASS_PREFIX + this._terminalClass);
this._terminal.screenElement.removeChild(this._rowContainer);
this._terminal.screenElement.removeChild(this._selectionContainer);
this._terminal.screenElement.removeChild(this._themeStyleElement);
this._terminal.screenElement.removeChild(this._dimensionsStyleElement);
super.dispose();
}
private _updateDimensions(): void {
this.dimensions.scaledCharWidth = this._terminal.charMeasure.width * window.devicePixelRatio;
this.dimensions.scaledCharHeight = this._terminal.charMeasure.height * window.devicePixelRatio;
this.dimensions.scaledCellWidth = this.dimensions.scaledCharWidth;
this.dimensions.scaledCellHeight = this.dimensions.scaledCharHeight;
this.dimensions.scaledCharLeft = 0;
this.dimensions.scaledCharTop = 0;
this.dimensions.scaledCanvasWidth = this.dimensions.scaledCellWidth * this._terminal.cols;
this.dimensions.scaledCanvasHeight = this.dimensions.scaledCellHeight * this._terminal.rows;
this.dimensions.canvasWidth = this._terminal.charMeasure.width * this._terminal.cols;
this.dimensions.canvasHeight = this._terminal.charMeasure.height * this._terminal.rows;
this.dimensions.actualCellWidth = this._terminal.charMeasure.width;
this.dimensions.actualCellHeight = this._terminal.charMeasure.height;
this._rowElements.forEach(element => {
element.style.width = `${this.dimensions.canvasWidth}px`;
element.style.height = `${this._terminal.charMeasure.height}px`;
});
if (!this._dimensionsStyleElement) {
this._dimensionsStyleElement = document.createElement('style');
this._terminal.screenElement.appendChild(this._dimensionsStyleElement);
}
const styles =
`${this._terminalSelector} .${ROW_CONTAINER_CLASS} span {` +
` display: inline-block;` +
` height: 100%;` +
` vertical-align: top;` +
` width: ${this._terminal.charMeasure.width}px` +
`}`;
this._dimensionsStyleElement.innerHTML = styles;
this._selectionContainer.style.height = (<any>this._terminal)._viewportElement.style.height;
this._rowContainer.style.width = `${this.dimensions.canvasWidth}px`;
this._rowContainer.style.height = `${this.dimensions.canvasHeight}px`;
}
public setTheme(theme: ITheme | undefined): IColorSet {
if (theme) {
this.colorManager.setTheme(theme);
}
if (!this._themeStyleElement) {
this._themeStyleElement = document.createElement('style');
this._terminal.screenElement.appendChild(this._themeStyleElement);
}
// Base CSS
let styles =
`${this._terminalSelector} .${ROW_CONTAINER_CLASS} {` +
` color: ${this.colorManager.colors.foreground.css};` +
` background-color: ${this.colorManager.colors.background.css};` +
` font-family: ${this._terminal.getOption('fontFamily')};` +
` font-size: ${this._terminal.getOption('fontSize')}px;` +
`}`;
// Text styles
styles +=
`${this._terminalSelector} span:not(.${BOLD_CLASS}) {` +
` font-weight: ${this._terminal.options.fontWeight};` +
`}` +
`${this._terminalSelector} span.${BOLD_CLASS} {` +
` font-weight: ${this._terminal.options.fontWeightBold};` +
`}` +
`${this._terminalSelector} span.${ITALIC_CLASS} {` +
` font-style: italic;` +
`}`;
// Cursor
styles +=
`${this._terminalSelector} .${ROW_CONTAINER_CLASS}:not(.${FOCUS_CLASS}) .${CURSOR_CLASS} {` +
` outline: 1px solid ${this.colorManager.colors.cursor.css};` +
` outline-offset: -1px;` +
`}` +
`${this._terminalSelector} .${ROW_CONTAINER_CLASS}.${FOCUS_CLASS} .${CURSOR_CLASS}.${CURSOR_STYLE_BLOCK_CLASS} {` +
` background-color: ${this.colorManager.colors.cursor.css};` +
` color: ${this.colorManager.colors.cursorAccent.css};` +
`}` +
`${this._terminalSelector} .${ROW_CONTAINER_CLASS}.${FOCUS_CLASS} .${CURSOR_CLASS}.${CURSOR_STYLE_BAR_CLASS} {` +
` box-shadow: 1px 0 0 ${this.colorManager.colors.cursor.css} inset;` +
`}` +
`${this._terminalSelector} .${ROW_CONTAINER_CLASS}.${FOCUS_CLASS} .${CURSOR_CLASS}.${CURSOR_STYLE_UNDERLINE_CLASS} {` +
` box-shadow: 0 -1px 0 ${this.colorManager.colors.cursor.css} inset;` +
`}`;
// Selection
styles +=
`${this._terminalSelector} .${SELECTION_CLASS} {` +
` position: absolute;` +
` top: 0;` +
` left: 0;` +
` z-index: 1;` +
` pointer-events: none;` +
`}` +
`${this._terminalSelector} .${SELECTION_CLASS} div {` +
` position: absolute;` +
` background-color: ${this.colorManager.colors.selection.css};` +
`}`;
// Colors
this.colorManager.colors.ansi.forEach((c, i) => {
styles +=
`${this._terminalSelector} .${FG_CLASS_PREFIX}${i} { color: ${c.css}; }` +
`${this._terminalSelector} .${BG_CLASS_PREFIX}${i} { background-color: ${c.css}; }`;
});
this._themeStyleElement.innerHTML = styles;
return this.colorManager.colors;
}
public onWindowResize(devicePixelRatio: number): void {
this._updateDimensions();
}
private _refreshRowElements(cols: number, rows: number): void {
// Add missing elements
for (let i = this._rowElements.length; i <= rows; i++) {
const row = document.createElement('div');
this._rowContainer.appendChild(row);
this._rowElements.push(row);
}
// Remove excess elements
while (this._rowElements.length > rows) {
this._rowContainer.removeChild(this._rowElements.pop());
}
}
public onResize(cols: number, rows: number): void {
this._refreshRowElements(cols, rows);
this._updateDimensions();
}
public onCharSizeChanged(): void {
this._updateDimensions();
}
public onBlur(): void {
this._rowContainer.classList.remove(FOCUS_CLASS);
}
public onFocus(): void {
this._rowContainer.classList.add(FOCUS_CLASS);
}
public onSelectionChanged(start: [number, number], end: [number, number], columnSelectMode: boolean): void {
// Remove all selections
while (this._selectionContainer.children.length) {
this._selectionContainer.removeChild(this._selectionContainer.children[0]);
}
// Selection does not exist
if (!start || !end) {
return;
}
// Translate from buffer position to viewport position
const viewportStartRow = start[1] - this._terminal.buffer.ydisp;
const viewportEndRow = end[1] - this._terminal.buffer.ydisp;
const viewportCappedStartRow = Math.max(viewportStartRow, 0);
const viewportCappedEndRow = Math.min(viewportEndRow, this._terminal.rows - 1);
// No need to draw the selection
if (viewportCappedStartRow >= this._terminal.rows || viewportCappedEndRow < 0) {
return;
}
// Create the selections
const documentFragment = document.createDocumentFragment();
if (columnSelectMode) {
documentFragment.appendChild(
this._createSelectionElement(viewportCappedStartRow, start[0], end[0], viewportCappedEndRow - viewportCappedStartRow + 1)
);
} else {
// Draw first row
const startCol = viewportStartRow === viewportCappedStartRow ? start[0] : 0;
const endCol = viewportCappedStartRow === viewportCappedEndRow ? end[0] : this._terminal.cols;
documentFragment.appendChild(this._createSelectionElement(viewportCappedStartRow, startCol, endCol));
// Draw middle rows
const middleRowsCount = viewportCappedEndRow - viewportCappedStartRow - 1;
documentFragment.appendChild(this._createSelectionElement(viewportCappedStartRow + 1, 0, this._terminal.cols, middleRowsCount));
// Draw final row
if (viewportCappedStartRow !== viewportCappedEndRow) {
// Only draw viewportEndRow if it's not the same as viewporttartRow
const endCol = viewportEndRow === viewportCappedEndRow ? end[0] : this._terminal.cols;
documentFragment.appendChild(this._createSelectionElement(viewportCappedEndRow, 0, endCol));
}
}
this._selectionContainer.appendChild(documentFragment);
}
/**
* Creates a selection element at the specified position.
* @param row The row of the selection.
* @param colStart The start column.
* @param colEnd The end columns.
*/
private _createSelectionElement(row: number, colStart: number, colEnd: number, rowCount: number = 1): HTMLElement {
const element = document.createElement('div');
element.style.height = `${rowCount * this._terminal.charMeasure.height}px`;
element.style.top = `${row * this._terminal.charMeasure.height}px`;
element.style.left = `${colStart * this._terminal.charMeasure.width}px`;
element.style.width = `${this._terminal.charMeasure.width * (colEnd - colStart)}px`;
return element;
}
public onCursorMove(): void {
// No-op, the cursor is drawn when rows are drawn
}
public onOptionsChanged(): void {
// Force a refresh
this._updateDimensions();
this.setTheme(undefined);
this._terminal.refresh(0, this._terminal.rows - 1);
}
public clear(): void {
this._rowElements.forEach(e => e.innerHTML = '');
}
public refreshRows(start: number, end: number): void {
this._renderDebouncer.refresh(start, end);
}
private _renderRows(start: number, end: number): void {
const terminal = this._terminal;
const cursorAbsoluteY = terminal.buffer.ybase + terminal.buffer.y;
const cursorX = this._terminal.buffer.x;
for (let y = start; y <= end; y++) {
const rowElement = this._rowElements[y];
rowElement.innerHTML = '';
const row = y + terminal.buffer.ydisp;
const lineData = terminal.buffer.lines.get(row);
const cursorStyle = terminal.options.cursorStyle;
rowElement.appendChild(this._rowFactory.createRow(lineData, row === cursorAbsoluteY, cursorStyle, cursorX, terminal.charMeasure.width, terminal.cols));
}
this._terminal.emit('refresh', {start, end});
}
private get _terminalSelector(): string {
return `.${TERMINAL_CLASS_PREFIX}${this._terminalClass}`;
}
public registerCharacterJoiner(handler: CharacterJoinerHandler): number { return -1; }
public deregisterCharacterJoiner(joinerId: number): boolean { return false; }
}