X-Git-Url: https://git.josue.xyz/?p=VSoRC%2F.git;a=blobdiff_plain;f=node_modules%2Fxterm%2Fsrc%2Fbrowser%2FViewport.ts;fp=node_modules%2Fxterm%2Fsrc%2Fbrowser%2FViewport.ts;h=b88f381d80ac0aa4cab3a11ba6f44f887a2a7786;hp=0000000000000000000000000000000000000000;hb=4339da12467b75fb8b6ca831f4bf0081c485ed2c;hpb=af450fde25a9ccf4767b29254c463ffb8ef25237

diff --git a/node_modules/xterm/src/browser/Viewport.ts b/node_modules/xterm/src/browser/Viewport.ts
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+++ b/node_modules/xterm/src/browser/Viewport.ts
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+/**
+ * Copyright (c) 2016 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { Disposable } from 'common/Lifecycle';
+import { addDisposableDomListener } from 'browser/Lifecycle';
+import { IColorSet, IViewport } from 'browser/Types';
+import { ICharSizeService, IRenderService } from 'browser/services/Services';
+import { IBufferService, IOptionsService } from 'common/services/Services';
+
+const FALLBACK_SCROLL_BAR_WIDTH = 15;
+
+/**
+ * Represents the viewport of a terminal, the visible area within the larger buffer of output.
+ * Logic for the virtual scroll bar is included in this object.
+ */
+export class Viewport extends Disposable implements IViewport {
+  public scrollBarWidth: number = 0;
+  private _currentRowHeight: number = 0;
+  private _lastRecordedBufferLength: number = 0;
+  private _lastRecordedViewportHeight: number = 0;
+  private _lastRecordedBufferHeight: number = 0;
+  private _lastTouchY: number = 0;
+  private _lastScrollTop: number = 0;
+
+  // Stores a partial line amount when scrolling, this is used to keep track of how much of a line
+  // is scrolled so we can "scroll" over partial lines and feel natural on touchpads. This is a
+  // quick fix and could have a more robust solution in place that reset the value when needed.
+  private _wheelPartialScroll: number = 0;
+
+  private _refreshAnimationFrame: number | null = null;
+  private _ignoreNextScrollEvent: boolean = false;
+
+  constructor(
+    private readonly _scrollLines: (amount: number, suppressEvent: boolean) => void,
+    private readonly _viewportElement: HTMLElement,
+    private readonly _scrollArea: HTMLElement,
+    @IBufferService private readonly _bufferService: IBufferService,
+    @IOptionsService private readonly _optionsService: IOptionsService,
+    @ICharSizeService private readonly _charSizeService: ICharSizeService,
+    @IRenderService private readonly _renderService: IRenderService
+  ) {
+    super();
+
+    // Measure the width of the scrollbar. If it is 0 we can assume it's an OSX overlay scrollbar.
+    // Unfortunately the overlay scrollbar would be hidden underneath the screen element in that case,
+    // therefore we account for a standard amount to make it visible
+    this.scrollBarWidth = (this._viewportElement.offsetWidth - this._scrollArea.offsetWidth) || FALLBACK_SCROLL_BAR_WIDTH;
+    this.register(addDisposableDomListener(this._viewportElement, 'scroll', this._onScroll.bind(this)));
+
+    // Perform this async to ensure the ICharSizeService is ready.
+    setTimeout(() => this.syncScrollArea(), 0);
+  }
+
+  public onThemeChange(colors: IColorSet): void {
+    this._viewportElement.style.backgroundColor = colors.background.css;
+  }
+
+  /**
+   * Refreshes row height, setting line-height, viewport height and scroll area height if
+   * necessary.
+   */
+  private _refresh(immediate: boolean): void {
+    if (immediate) {
+      this._innerRefresh();
+      if (this._refreshAnimationFrame !== null) {
+        cancelAnimationFrame(this._refreshAnimationFrame);
+      }
+      return;
+    }
+    if (this._refreshAnimationFrame === null) {
+      this._refreshAnimationFrame = requestAnimationFrame(() => this._innerRefresh());
+    }
+  }
+
+  private _innerRefresh(): void {
+    if (this._charSizeService.height > 0) {
+      this._currentRowHeight = this._renderService.dimensions.scaledCellHeight / window.devicePixelRatio;
+      this._lastRecordedViewportHeight = this._viewportElement.offsetHeight;
+      const newBufferHeight = Math.round(this._currentRowHeight * this._lastRecordedBufferLength) + (this._lastRecordedViewportHeight - this._renderService.dimensions.canvasHeight);
+      if (this._lastRecordedBufferHeight !== newBufferHeight) {
+        this._lastRecordedBufferHeight = newBufferHeight;
+        this._scrollArea.style.height = this._lastRecordedBufferHeight + 'px';
+      }
+    }
+
+    // Sync scrollTop
+    const scrollTop = this._bufferService.buffer.ydisp * this._currentRowHeight;
+    if (this._viewportElement.scrollTop !== scrollTop) {
+      // Ignore the next scroll event which will be triggered by setting the scrollTop as we do not
+      // want this event to scroll the terminal
+      this._ignoreNextScrollEvent = true;
+      this._viewportElement.scrollTop = scrollTop;
+    }
+
+    this._refreshAnimationFrame = null;
+  }
+  /**
+   * Updates dimensions and synchronizes the scroll area if necessary.
+   */
+  public syncScrollArea(immediate: boolean = false): void {
+    // If buffer height changed
+    if (this._lastRecordedBufferLength !== this._bufferService.buffer.lines.length) {
+      this._lastRecordedBufferLength = this._bufferService.buffer.lines.length;
+      this._refresh(immediate);
+      return;
+    }
+
+    // If viewport height changed
+    if (this._lastRecordedViewportHeight !== this._renderService.dimensions.canvasHeight) {
+      this._refresh(immediate);
+      return;
+    }
+
+    // If the buffer position doesn't match last scroll top
+    const newScrollTop = this._bufferService.buffer.ydisp * this._currentRowHeight;
+    if (this._lastScrollTop !== newScrollTop) {
+      this._refresh(immediate);
+      return;
+    }
+
+    // If element's scroll top changed, this can happen when hiding the element
+    if (this._lastScrollTop !== this._viewportElement.scrollTop) {
+      this._refresh(immediate);
+      return;
+    }
+
+    // If row height changed
+    if (this._renderService.dimensions.scaledCellHeight / window.devicePixelRatio !== this._currentRowHeight) {
+      this._refresh(immediate);
+      return;
+    }
+  }
+
+  /**
+   * Handles scroll events on the viewport, calculating the new viewport and requesting the
+   * terminal to scroll to it.
+   * @param ev The scroll event.
+   */
+  private _onScroll(ev: Event): void {
+    // Record current scroll top position
+    this._lastScrollTop = this._viewportElement.scrollTop;
+
+    // Don't attempt to scroll if the element is not visible, otherwise scrollTop will be corrupt
+    // which causes the terminal to scroll the buffer to the top
+    if (!this._viewportElement.offsetParent) {
+      return;
+    }
+
+    // Ignore the event if it was flagged to ignore (when the source of the event is from Viewport)
+    if (this._ignoreNextScrollEvent) {
+      this._ignoreNextScrollEvent = false;
+      return;
+    }
+
+    const newRow = Math.round(this._lastScrollTop / this._currentRowHeight);
+    const diff = newRow - this._bufferService.buffer.ydisp;
+    this._scrollLines(diff, true);
+  }
+
+  /**
+   * Handles bubbling of scroll event in case the viewport has reached top or bottom
+   * @param ev The scroll event.
+   * @param amount The amount scrolled
+   */
+  private _bubbleScroll(ev: Event, amount: number): boolean {
+    const scrollPosFromTop = this._viewportElement.scrollTop + this._lastRecordedViewportHeight;
+    if ((amount < 0 && this._viewportElement.scrollTop !== 0) ||
+        (amount > 0 &&  scrollPosFromTop < this._lastRecordedBufferHeight)) {
+      if (ev.cancelable) {
+        ev.preventDefault();
+      }
+      return false;
+    }
+    return true;
+  }
+
+  /**
+   * Handles mouse wheel events by adjusting the viewport's scrollTop and delegating the actual
+   * scrolling to `onScroll`, this event needs to be attached manually by the consumer of
+   * `Viewport`.
+   * @param ev The mouse wheel event.
+   */
+  public onWheel(ev: WheelEvent): boolean {
+    const amount = this._getPixelsScrolled(ev);
+    if (amount === 0) {
+      return false;
+    }
+    this._viewportElement.scrollTop += amount;
+    return this._bubbleScroll(ev, amount);
+  }
+
+  private _getPixelsScrolled(ev: WheelEvent): number {
+    // Do nothing if it's not a vertical scroll event
+    if (ev.deltaY === 0) {
+      return 0;
+    }
+
+    // Fallback to WheelEvent.DOM_DELTA_PIXEL
+    let amount = this._applyScrollModifier(ev.deltaY, ev);
+    if (ev.deltaMode === WheelEvent.DOM_DELTA_LINE) {
+      amount *= this._currentRowHeight;
+    } else if (ev.deltaMode === WheelEvent.DOM_DELTA_PAGE) {
+      amount *= this._currentRowHeight * this._bufferService.rows;
+    }
+    return amount;
+  }
+
+  /**
+   * Gets the number of pixels scrolled by the mouse event taking into account what type of delta
+   * is being used.
+   * @param ev The mouse wheel event.
+   */
+  public getLinesScrolled(ev: WheelEvent): number {
+    // Do nothing if it's not a vertical scroll event
+    if (ev.deltaY === 0) {
+      return 0;
+    }
+
+    // Fallback to WheelEvent.DOM_DELTA_LINE
+    let amount = this._applyScrollModifier(ev.deltaY, ev);
+    if (ev.deltaMode === WheelEvent.DOM_DELTA_PIXEL) {
+      amount /= this._currentRowHeight + 0.0; // Prevent integer division
+      this._wheelPartialScroll += amount;
+      amount = Math.floor(Math.abs(this._wheelPartialScroll)) * (this._wheelPartialScroll > 0 ? 1 : -1);
+      this._wheelPartialScroll %= 1;
+    } else if (ev.deltaMode === WheelEvent.DOM_DELTA_PAGE) {
+      amount *= this._bufferService.rows;
+    }
+    return amount;
+  }
+
+  private _applyScrollModifier(amount: number, ev: WheelEvent): number {
+    const modifier = this._optionsService.options.fastScrollModifier;
+    // Multiply the scroll speed when the modifier is down
+    if ((modifier === 'alt' && ev.altKey) ||
+        (modifier === 'ctrl' && ev.ctrlKey) ||
+        (modifier === 'shift' && ev.shiftKey)) {
+      return amount * this._optionsService.options.fastScrollSensitivity * this._optionsService.options.scrollSensitivity;
+    }
+
+    return amount * this._optionsService.options.scrollSensitivity;
+  }
+
+  /**
+   * Handles the touchstart event, recording the touch occurred.
+   * @param ev The touch event.
+   */
+  public onTouchStart(ev: TouchEvent): void {
+    this._lastTouchY = ev.touches[0].pageY;
+  }
+
+  /**
+   * Handles the touchmove event, scrolling the viewport if the position shifted.
+   * @param ev The touch event.
+   */
+  public onTouchMove(ev: TouchEvent): boolean {
+    const deltaY = this._lastTouchY - ev.touches[0].pageY;
+    this._lastTouchY = ev.touches[0].pageY;
+    if (deltaY === 0) {
+      return false;
+    }
+    this._viewportElement.scrollTop += deltaY;
+    return this._bubbleScroll(ev, deltaY);
+  }
+}