B2G/gecko/toolkit/content/tests/fennec-tile-testapp/chrome/content/BrowserView.js
/**
     * @param dx Guess delta to destination x coordinate
     * @param dy Guess delta to destination y coordinate
     */
@param dx Guess delta to destination x coordinate
@param dy Guess delta to destination y coordinate
@param dx Guess delta to destination x coordinate @param dy Guess delta to destination y coordinate
function onBeforeVisibleMove(dx, dy) {
      let vs = this._browserViewportState;
      let vr = this._visibleRect;
      let destCR = visibleRectToCriticalRect(vr.clone().translate(dx, dy), vs);
      this._tileManager.beginCriticalMove(destCR);
    }
function onBeforeVisibleMove ( dx , dy ) { let vs = this . _browserViewportState ; let vr = this . _visibleRect ; let destCR = visibleRectToCriticalRect ( vr . clone ( ) . translate ( dx , dy ) , vs ) ; this . _tileManager . beginCriticalMove ( destCR ) ; }
@param dx Guess delta to destination x coordinate
 @param dy Guess delta to destination y coordinate
@param dx Guess delta to destination x coordinate @param dy Guess delta to destination y coordinate