handle selection when resizing

addons/addon-canvas/src/BaseRenderLayer.ts

@@ -91,7 +91,7 @@ export abstract class BaseRenderLayer extends Disposable implements IRenderLayer
   public handleGridChanged(startRow: number, endRow: number): void {}
 
   public handleSelectionChanged(start: [number, number] | undefined, end: [number, number] | undefined, columnSelectMode: boolean = false): void {
-    this._selectionModel.update(this._terminal, start, end, columnSelectMode);
+    this._selectionModel.update((this._terminal as any)._core, start, end, columnSelectMode);
   }
 
   protected _setTransparency(alpha: boolean): void {

addons/addon-webgl/src/WebglRenderer.ts

@@ -219,7 +219,7 @@ export class WebglRenderer extends Disposable implements IRenderer {
     for (const l of this._renderLayers) {
       l.handleSelectionChanged(this._terminal, start, end, columnSelectMode);
     }
-    this._model.selection.update(this._terminal, start, end, columnSelectMode);
+    this._model.selection.update(this._core, start, end, columnSelectMode);
     this._requestRedrawViewport();
   }
 

src/browser/Terminal.ts

@@ -575,7 +575,7 @@ export class Terminal extends CoreTerminal implements ITerminal {
   }
 
   private _createRenderer(): IRenderer {
-    return this._instantiationService.createInstance(DomRenderer, this._document!, this.element!, this.screenElement!, this._viewportElement!, this._helperContainer!, this.linkifier2);
+    return this._instantiationService.createInstance(DomRenderer, this, this._document!, this.element!, this.screenElement!, this._viewportElement!, this._helperContainer!, this.linkifier2);
   }
 
   /**

src/browser/renderer/dom/DomRenderer.ts

@@ -7,9 +7,10 @@ import { DomRendererRowFactory, RowCss } from 'browser/renderer/dom/DomRendererR
 import { WidthCache } from 'browser/renderer/dom/WidthCache';
 import { INVERTED_DEFAULT_COLOR } from 'browser/renderer/shared/Constants';
 import { createRenderDimensions } from 'browser/renderer/shared/RendererUtils';
-import { IRenderDimensions, IRenderer, IRequestRedrawEvent } from 'browser/renderer/shared/Types';
+import { createSelectionRenderModel } from 'browser/renderer/shared/SelectionRenderModel';
+import { IRenderDimensions, IRenderer, IRequestRedrawEvent, ISelectionRenderModel } from 'browser/renderer/shared/Types';
 import { ICharSizeService, ICoreBrowserService, IThemeService } from 'browser/services/Services';
-import { ILinkifier2, ILinkifierEvent, ReadonlyColorSet } from 'browser/Types';
+import { ILinkifier2, ILinkifierEvent, ITerminal, ReadonlyColorSet } from 'browser/Types';
 import { color } from 'common/Color';
 import { EventEmitter } from 'common/EventEmitter';
 import { Disposable, toDisposable } from 'common/Lifecycle';
@@ -25,7 +26,6 @@ const SELECTION_CLASS = 'xterm-selection';
 
 let nextTerminalId = 1;
 
-
 /**
  * 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
@@ -41,12 +41,14 @@ export class DomRenderer extends Disposable implements IRenderer {
   private _rowElements: HTMLElement[] = [];
   private _selectionContainer: HTMLElement;
   private _widthCache: WidthCache;
+  private _selectionRenderModel: ISelectionRenderModel = createSelectionRenderModel();
 
   public dimensions: IRenderDimensions;
 
   public readonly onRequestRedraw = this.register(new EventEmitter<IRequestRedrawEvent>()).event;
 
   constructor(
+    private readonly _terminal: ITerminal,
     private readonly _document: Document,
     private readonly _element: HTMLElement,
     private readonly _screenElement: HTMLElement,
@@ -291,6 +293,7 @@ export class DomRenderer extends Disposable implements IRenderer {
   public handleResize(cols: number, rows: number): void {
     this._refreshRowElements(cols, rows);
     this._updateDimensions();
+    this.handleSelectionChanged(this._selectionRenderModel.selectionStart, this._selectionRenderModel.selectionEnd, this._selectionRenderModel.columnSelectMode);
   }
 
   public handleCharSizeChanged(): void {
@@ -320,11 +323,13 @@ export class DomRenderer extends Disposable implements IRenderer {
       return;
     }
 
+    this._selectionRenderModel.update(this._terminal, start, end, columnSelectMode);
+
     // Translate from buffer position to viewport position
-    const viewportStartRow = start[1] - this._bufferService.buffer.ydisp;
-    const viewportEndRow = end[1] - this._bufferService.buffer.ydisp;
-    const viewportCappedStartRow = Math.max(viewportStartRow, 0);
-    const viewportCappedEndRow = Math.min(viewportEndRow, this._bufferService.rows - 1);
+    const viewportStartRow = this._selectionRenderModel.viewportStartRow;
+    const viewportEndRow = this._selectionRenderModel.viewportEndRow;
+    const viewportCappedStartRow = this._selectionRenderModel.viewportCappedStartRow;
+    const viewportCappedEndRow = this._selectionRenderModel.viewportCappedEndRow;
 
     // No need to draw the selection
     if (viewportCappedStartRow >= this._bufferService.rows || viewportCappedEndRow < 0) {
@@ -365,10 +370,16 @@ export class DomRenderer extends Disposable implements IRenderer {
    */
   private _createSelectionElement(row: number, colStart: number, colEnd: number, rowCount: number = 1): HTMLElement {
     const element = this._document.createElement('div');
+    const left = colStart * this.dimensions.css.cell.width;
+    let width = this.dimensions.css.cell.width * (colEnd - colStart);
+    if (left + width > this.dimensions.css.canvas.width) {
+      width = this.dimensions.css.canvas.width - left;
+    }
+
     element.style.height = `${rowCount * this.dimensions.css.cell.height}px`;
     element.style.top = `${row * this.dimensions.css.cell.height}px`;
-    element.style.left = `${colStart * this.dimensions.css.cell.width}px`;
-    element.style.width = `${this.dimensions.css.cell.width * (colEnd - colStart)}px`;
+    element.style.left = `${left}px`;
+    element.style.width = `${width}px`;
     return element;
   }
 

src/browser/renderer/shared/SelectionRenderModel.ts

@@ -3,6 +3,7 @@
  * @license MIT
  */
 
+import { ITerminal } from 'browser/Types';
 import { ISelectionRenderModel } from 'browser/renderer/shared/Types';
 import { Terminal } from '@xterm/xterm';
 
@@ -35,7 +36,7 @@ class SelectionRenderModel implements ISelectionRenderModel {
     this.selectionEnd = undefined;
   }
 
-  public update(terminal: Terminal, start: [number, number] | undefined, end: [number, number] | undefined, columnSelectMode: boolean = false): void {
+  public update(terminal: ITerminal, start: [number, number] | undefined, end: [number, number] | undefined, columnSelectMode: boolean = false): void {
     this.selectionStart = start;
     this.selectionEnd = end;
     // Selection does not exist
@@ -45,8 +46,9 @@ class SelectionRenderModel implements ISelectionRenderModel {
     }
 
     // Translate from buffer position to viewport position
-    const viewportStartRow = start[1] - terminal.buffer.active.viewportY;
-    const viewportEndRow = end[1] - terminal.buffer.active.viewportY;
+    const viewportY = terminal.buffers.active.ydisp;
+    const viewportStartRow = start[1] - viewportY;
+    const viewportEndRow = end[1] - viewportY;
     const viewportCappedStartRow = Math.max(viewportStartRow, 0);
     const viewportCappedEndRow = Math.min(viewportEndRow, terminal.rows - 1);
 

src/browser/renderer/shared/Types.d.ts

@@ -4,7 +4,7 @@
  */
 
 import { FontWeight, Terminal } from '@xterm/xterm';
-import { IColorSet } from 'browser/Types';
+import { IColorSet, ITerminal } from 'browser/Types';
 import { IDisposable } from 'common/Types';
 import { IEvent } from 'common/EventEmitter';
 
@@ -168,6 +168,6 @@ export interface ISelectionRenderModel {
   readonly selectionStart: [number, number] | undefined;
   readonly selectionEnd: [number, number] | undefined;
   clear(): void;
-  update(terminal: Terminal, start: [number, number] | undefined, end: [number, number] | undefined, columnSelectMode?: boolean): void;
+  update(terminal: ITerminal, start: [number, number] | undefined, end: [number, number] | undefined, columnSelectMode?: boolean): void;
   isCellSelected(terminal: Terminal, x: number, y: number): boolean;
 }