69 lines
2.8 KiB
TypeScript
69 lines
2.8 KiB
TypeScript
import { ISelectionRenderLayer } from './Interfaces';
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import { IBuffer, ICharMeasure, ITerminal } from '../Interfaces';
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import { CHAR_DATA_ATTR_INDEX } from '../Buffer';
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import { GridCache } from './GridCache';
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import { FLAGS } from './Types';
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import { BaseRenderLayer } from './BaseRenderLayer';
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export class SelectionRenderLayer extends BaseRenderLayer implements ISelectionRenderLayer {
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private _state: {start: [number, number], end: [number, number]};
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constructor(container: HTMLElement, zIndex: number) {
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super(container, 'selection', zIndex);
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this._state = {
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start: null,
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end: null
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};
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}
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public render(terminal: ITerminal, start: [number, number], end: [number, number]): void {
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const scaledCharWidth = Math.ceil(terminal.charMeasure.width) * window.devicePixelRatio;
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const scaledCharHeight = Math.ceil(terminal.charMeasure.height) * window.devicePixelRatio;
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// Selection has not changed
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if (this._state.start === start || this._state.end === end) {
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return;
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}
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// Remove all selections
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this._ctx.clearRect(0, 0, this._canvas.width, this._canvas.height);
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// Selection does not exist
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if (!start || !end) {
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return;
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}
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// Translate from buffer position to viewport position
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const viewportStartRow = start[1] - terminal.buffer.ydisp;
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const viewportEndRow = end[1] - terminal.buffer.ydisp;
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const viewportCappedStartRow = Math.max(viewportStartRow, 0);
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const viewportCappedEndRow = Math.min(viewportEndRow, terminal.rows - 1);
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// No need to draw the selection
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if (viewportCappedStartRow >= terminal.rows || viewportCappedEndRow < 0) {
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return;
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}
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// Draw first row
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const startCol = viewportStartRow === viewportCappedStartRow ? start[0] : 0;
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const startRowEndCol = viewportCappedStartRow === viewportCappedEndRow ? end[0] : terminal.cols;
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this._ctx.fillStyle = 'rgba(255,255,255,0.3)';
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this._ctx.fillRect(startCol * scaledCharWidth, viewportCappedStartRow * scaledCharHeight, (startRowEndCol - startCol) * scaledCharWidth, scaledCharHeight);
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// Draw middle rows
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const middleRowsCount = Math.max(viewportCappedEndRow - viewportCappedStartRow - 1, 0);
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this._ctx.fillRect(0, (viewportCappedStartRow + 1) * scaledCharHeight, terminal.cols * scaledCharWidth, middleRowsCount * scaledCharHeight);
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// Draw final row
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if (viewportCappedStartRow !== viewportCappedEndRow) {
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// Only draw viewportEndRow if it's not the same as viewporttartRow
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const endCol = viewportEndRow === viewportCappedEndRow ? end[0] : terminal.cols;
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this._ctx.fillRect(0, viewportCappedEndRow * scaledCharHeight, endCol * scaledCharWidth, scaledCharHeight);
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}
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// Save state for next render
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this._state.start = [start[0], start[1]];
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this._state.end = [end[0], end[1]];
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}
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}
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