fabric/dist/src/shapes/IText/ITextBehavior.mjs.map

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

{"version":3,"file":"ITextBehavior.mjs","names":[],"sources":["../../../../src/shapes/IText/ITextBehavior.ts"],"sourcesContent":["import type { ObjectEvents, TPointerEvent } from '../../EventTypeDefs';\nimport { Point } from '../../Point';\nimport type { FabricObject } from '../Object/FabricObject';\nimport { FabricText } from '../Text/Text';\nimport { animate } from '../../util/animation/animate';\nimport type { TOnAnimationChangeCallback } from '../../util/animation/types';\nimport type { ValueAnimation } from '../../util/animation/ValueAnimation';\nimport type { TextStyleDeclaration } from '../Text/StyledText';\nimport type { SerializedTextProps, TextProps } from '../Text/Text';\nimport type { TOptions, TOriginX } from '../../typedefs';\nimport { getDocumentFromElement } from '../../util/dom_misc';\nimport { LEFT, LTR, MODIFIED, RIGHT, reNewline } from '../../constants';\nimport type { IText } from './IText';\nimport { JUSTIFY } from '../Text/constants';\n\n/**\n *  extend this regex to support non english languages\n *\n *  - ` `      Matches a SPACE character (char code 32).\n *  - `\\n`     Matches a LINE FEED character (char code 10).\n *  - `\\.`     Matches a \".\" character (char code 46).\n *  - `,`      Matches a \",\" character (char code 44).\n *  - `;`      Matches a \";\" character (char code 59).\n *  - `!`      Matches a \"!\" character (char code 33).\n *  - `\\?`     Matches a \"?\" character (char code 63).\n *  - `\\-`     Matches a \"-\" character (char code 45).\n */\n// eslint-disable-next-line no-useless-escape\nconst reNonWord = /[ \\n\\.,;!\\?\\-]/;\n\nexport type ITextEvents = ObjectEvents & {\n  'selection:changed': never;\n  changed: never | { index: number; action: string };\n  'editing:entered': never | { e: TPointerEvent };\n  'editing:exited': never;\n};\n\nexport abstract class ITextBehavior<\n  Props extends TOptions<TextProps> = Partial<TextProps>,\n  SProps extends SerializedTextProps = SerializedTextProps,\n  EventSpec extends ITextEvents = ITextEvents,\n> extends FabricText<Props, SProps, EventSpec> {\n  declare abstract isEditing: boolean;\n  declare abstract cursorDelay: number;\n  declare abstract selectionStart: number;\n  declare abstract selectionEnd: number;\n  declare abstract cursorDuration: number;\n  declare abstract editable: boolean;\n  declare abstract editingBorderColor: string;\n\n  declare abstract compositionStart: number;\n  declare abstract compositionEnd: number;\n\n  declare abstract hiddenTextarea: HTMLTextAreaElement | null;\n\n  /**\n   * Helps determining when the text is in composition, so that the cursor\n   * rendering is altered.\n   */\n  declare protected inCompositionMode: boolean;\n\n  declare protected _reSpace: RegExp;\n  declare private _currentTickState?: ValueAnimation;\n  declare private _currentTickCompleteState?: ValueAnimation;\n  protected _currentCursorOpacity = 1;\n  declare private _textBeforeEdit: string;\n  declare protected __selectionStartOnMouseDown: number;\n\n  /**\n   * Keeps track if the IText object was selected before the actual click.\n   * This because we want to delay enter editing by a click.\n   */\n  declare protected selected: boolean;\n  declare protected cursorOffsetCache: { left?: number; top?: number };\n  declare protected _savedProps?: {\n    hasControls: boolean;\n    borderColor: string;\n    lockMovementX: boolean;\n    lockMovementY: boolean;\n    selectable: boolean;\n    hoverCursor: CSSStyleDeclaration['cursor'] | null;\n    defaultCursor?: CSSStyleDeclaration['cursor'];\n    moveCursor?: CSSStyleDeclaration['cursor'];\n  };\n  declare protected _selectionDirection: 'left' | 'right' | null;\n\n  abstract initHiddenTextarea(): void;\n  abstract _fireSelectionChanged(): void;\n  abstract renderCursorOrSelection(): void;\n  abstract getSelectionStartFromPointer(e: TPointerEvent): number;\n  abstract _getCursorBoundaries(\n    index: number,\n    skipCaching?: boolean,\n  ): {\n    left: number;\n    top: number;\n    leftOffset: number;\n    topOffset: number;\n  };\n\n  /**\n   * Initializes all the interactive behavior of IText\n   */\n  initBehavior() {\n    this._tick = this._tick.bind(this);\n    this._onTickComplete = this._onTickComplete.bind(this);\n    this.updateSelectionOnMouseMove =\n      this.updateSelectionOnMouseMove.bind(this);\n  }\n\n  onDeselect(options?: { e?: TPointerEvent; object?: FabricObject }) {\n    this.isEditing && this.exitEditing();\n    this.selected = false;\n    return super.onDeselect(options);\n  }\n\n  /**\n   * @private\n   */\n  _animateCursor({\n    toValue,\n    duration,\n    delay,\n    onComplete,\n  }: {\n    toValue: number;\n    duration: number;\n    delay?: number;\n    onComplete?: TOnAnimationChangeCallback<number>;\n  }) {\n    return animate({\n      startValue: this._currentCursorOpacity,\n      endValue: toValue,\n      duration,\n      delay,\n      onComplete,\n      abort: () =>\n        !this.canvas ||\n        // we do not want to animate a selection, only cursor\n        this.selectionStart !== this.selectionEnd,\n      onChange: (value) => {\n        this._currentCursorOpacity = value;\n        this.renderCursorOrSelection();\n      },\n    });\n  }\n\n  /**\n   * changes the cursor from visible to invisible\n   */\n  private _tick(delay?: number) {\n    this._currentTickState = this._animateCursor({\n      toValue: 0,\n      duration: this.cursorDuration / 2,\n      delay: Math.max(delay || 0, 100),\n      onComplete: this._onTickComplete,\n    });\n  }\n\n  /**\n   * Changes the cursor from invisible to visible\n   */\n  private _onTickComplete() {\n    this._currentTickCompleteState?.abort();\n    this._currentTickCompleteState = this._animateCursor({\n      toValue: 1,\n      duration: this.cursorDuration,\n      onComplete: this._tick,\n    });\n  }\n\n  /**\n   * Initializes delayed cursor\n   */\n  initDelayedCursor(restart?: boolean) {\n    this.abortCursorAnimation();\n    this._tick(restart ? 0 : this.cursorDelay);\n  }\n\n  /**\n   * Aborts cursor animation, clears all timeouts and clear textarea context if necessary\n   */\n  abortCursorAnimation() {\n    let shouldClear = false;\n    [this._currentTickState, this._currentTickCompleteState].forEach(\n      (cursorAnimation) => {\n        if (cursorAnimation && !cursorAnimation.isDone()) {\n          shouldClear = true;\n          cursorAnimation.abort();\n        }\n      },\n    );\n\n    this._currentCursorOpacity = 1;\n\n    //  make sure we clear context even if instance is not editing\n    if (shouldClear) {\n      this.clearContextTop();\n    }\n  }\n\n  /**\n   * Restart tue cursor animation if either is in complete state ( between animations )\n   * or if it never started before\n   */\n  restartCursorIfNeeded() {\n    if (\n      [this._currentTickState, this._currentTickCompleteState].some(\n        (cursorAnimation) => !cursorAnimation || cursorAnimation.isDone(),\n      )\n    ) {\n      this.initDelayedCursor();\n    }\n  }\n\n  /**\n   * Selects entire text\n   */\n  selectAll() {\n    this.selectionStart = 0;\n    this.selectionEnd = this._text.length;\n    this._fireSelectionChanged();\n    this._updateTextarea();\n    return this;\n  }\n\n  /**\n   * Selects entire text and updates the visual state\n   */\n  cmdAll() {\n    this.selectAll();\n    this.renderCursorOrSelection();\n  }\n\n  /**\n   * Returns selected text\n   * @return {String}\n   */\n  getSelectedText(): string {\n    return this._text.slice(this.selectionStart, this.selectionEnd).join('');\n  }\n\n  /**\n   * Find new selection index representing start of current word according to current selection index\n   * @param {Number} startFrom Current selection index\n   * @return {Number} New selection index\n   */\n  findWordBoundaryLeft(startFrom: number): number {\n    let offset = 0,\n      index = startFrom - 1;\n\n    // remove space before cursor first\n    if (this._reSpace.test(this._text[index])) {\n      while (this._reSpace.test(this._text[index])) {\n        offset++;\n        index--;\n      }\n    }\n    while (/\\S/.test(this._text[index]) && index > -1) {\n      offset++;\n      index--;\n    }\n\n    return startFrom - offset;\n  }\n\n  /**\n   * Find new selection index representing end of current word according to current selection index\n   * @param {Number} startFrom Current selection index\n   * @return {Number} New selection index\n   */\n  findWordBoundaryRight(startFrom: number): number {\n    let offset = 0,\n      index = startFrom;\n\n    // remove space after cursor first\n    if (this._reSpace.test(this._text[index])) {\n      while (this._reSpace.test(this._text[index])) {\n        offset++;\n        index++;\n      }\n    }\n    while (/\\S/.test(this._text[index]) && index < this._text.length) {\n      offset++;\n      index++;\n    }\n\n    return startFrom + offset;\n  }\n\n  /**\n   * Find new selection index representing start of current line according to current selection index\n   * @param {Number} startFrom Current selection index\n   * @return {Number} New selection index\n   */\n  findLineBoundaryLeft(startFrom: number): number {\n    let offset = 0,\n      index = startFrom - 1;\n\n    while (!/\\n/.test(this._text[index]) && index > -1) {\n      offset++;\n      index--;\n    }\n\n    return startFrom - offset;\n  }\n\n  /**\n   * Find new selection index representing end of current line according to current selection index\n   * @param {Number} startFrom Current selection index\n   * @return {Number} New selection index\n   */\n  findLineBoundaryRight(startFrom: number): number {\n    let offset = 0,\n      index = startFrom;\n\n    while (!/\\n/.test(this._text[index]) && index < this._text.length) {\n      offset++;\n      index++;\n    }\n\n    return startFrom + offset;\n  }\n\n  /**\n   * Finds index corresponding to beginning or end of a word\n   * @param {Number} selectionStart Index of a character\n   * @param {Number} direction 1 or -1\n   * @return {Number} Index of the beginning or end of a word\n   */\n  searchWordBoundary(selectionStart: number, direction: 1 | -1): number {\n    const text = this._text;\n    // if we land on a space we move the cursor backwards\n    // if we are searching boundary end we move the cursor backwards ONLY if we don't land on a line break\n    let index =\n        selectionStart > 0 &&\n        this._reSpace.test(text[selectionStart]) &&\n        (direction === -1 || !reNewline.test(text[selectionStart - 1]))\n          ? selectionStart - 1\n          : selectionStart,\n      _char = text[index];\n    while (index > 0 && index < text.length && !reNonWord.test(_char)) {\n      index += direction;\n      _char = text[index];\n    }\n    if (direction === -1 && reNonWord.test(_char)) {\n      index++;\n    }\n    return index;\n  }\n\n  /**\n   * Selects the word that contains the char at index selectionStart\n   * @param {Number} selectionStart Index of a character\n   */\n  selectWord(selectionStart?: number) {\n    selectionStart = selectionStart ?? this.selectionStart;\n    // search backwards\n    const newSelectionStart = this.searchWordBoundary(selectionStart, -1),\n      // search forward\n      newSelectionEnd = Math.max(\n        newSelectionStart,\n        this.searchWordBoundary(selectionStart, 1),\n      );\n\n    this.selectionStart = newSelectionStart;\n    this.selectionEnd = newSelectionEnd;\n    this._fireSelectionChanged();\n    this._updateTextarea();\n    // remove next major, for now it renders twice :(\n    this.renderCursorOrSelection();\n  }\n\n  /**\n   * Selects the line that contains selectionStart\n   * @param {Number} selectionStart Index of a character\n   */\n  selectLine(selectionStart?: number) {\n    selectionStart = selectionStart ?? this.selectionStart;\n    const newSelectionStart = this.findLineBoundaryLeft(selectionStart),\n      newSelectionEnd = this.findLineBoundaryRight(selectionStart);\n\n    this.selectionStart = newSelectionStart;\n    this.selectionEnd = newSelectionEnd;\n    this._fireSelectionChanged();\n    this._updateTextarea();\n  }\n\n  /**\n   * Enters editing state\n   */\n  enterEditing(e?: TPointerEvent) {\n    if (this.isEditing || !this.editable) {\n      return;\n    }\n    this.enterEditingImpl();\n    this.fire('editing:entered', e ? { e } : undefined);\n    this._fireSelectionChanged();\n    if (this.canvas) {\n      this.canvas.fire('text:editing:entered', {\n        target: this as unknown as IText,\n        e,\n      });\n      this.canvas.requestRenderAll();\n    }\n  }\n\n  /**\n   * runs the actual logic that enter from editing state, see {@link enterEditing}\n   */\n  enterEditingImpl() {\n    if (this.canvas) {\n      this.canvas.calcOffset();\n      this.canvas.textEditingManager.exitTextEditing();\n    }\n\n    this.isEditing = true;\n\n    this.initHiddenTextarea();\n    this.hiddenTextarea!.focus();\n    this.hiddenTextarea!.value = this.text;\n    this._updateTextarea();\n    this._saveEditingProps();\n    this._setEditingProps();\n    this._textBeforeEdit = this.text;\n\n    this._tick();\n  }\n\n  /**\n   * called by {@link Canvas#textEditingManager}\n   */\n  updateSelectionOnMouseMove(e: TPointerEvent) {\n    if (this.getActiveControl()) {\n      return;\n    }\n\n    const el = this.hiddenTextarea!;\n    // regain focus\n    getDocumentFromElement(el).activeElement !== el && el.focus();\n\n    const newSelectionStart = this.getSelectionStartFromPointer(e),\n      currentStart = this.selectionStart,\n      currentEnd = this.selectionEnd;\n    if (\n      (newSelectionStart !== this.__selectionStartOnMouseDown ||\n        currentStart === currentEnd) &&\n      (currentStart === newSelectionStart || currentEnd === newSelectionStart)\n    ) {\n      return;\n    }\n    if (newSelectionStart > this.__selectionStartOnMouseDown) {\n      this.selectionStart = this.__selectionStartOnMouseDown;\n      this.selectionEnd = newSelectionStart;\n    } else {\n      this.selectionStart = newSelectionStart;\n      this.selectionEnd = this.__selectionStartOnMouseDown;\n    }\n    if (\n      this.selectionStart !== currentStart ||\n      this.selectionEnd !== currentEnd\n    ) {\n      this._fireSelectionChanged();\n      this._updateTextarea();\n      this.renderCursorOrSelection();\n    }\n  }\n\n  /**\n   * @private\n   */\n  _setEditingProps() {\n    this.hoverCursor = 'text';\n\n    if (this.canvas) {\n      this.canvas.defaultCursor = this.canvas.moveCursor = 'text';\n    }\n\n    this.borderColor = this.editingBorderColor;\n    this.hasControls = this.selectable = false;\n    this.lockMovementX = this.lockMovementY = true;\n  }\n\n  /**\n   * convert from textarea to grapheme indexes\n   */\n  fromStringToGraphemeSelection(start: number, end: number, text: string) {\n    const smallerTextStart = text.slice(0, start),\n      graphemeStart = this.graphemeSplit(smallerTextStart).length;\n    if (start === end) {\n      return { selectionStart: graphemeStart, selectionEnd: graphemeStart };\n    }\n    const smallerTextEnd = text.slice(start, end),\n      graphemeEnd = this.graphemeSplit(smallerTextEnd).length;\n    return {\n      selectionStart: graphemeStart,\n      selectionEnd: graphemeStart + graphemeEnd,\n    };\n  }\n\n  /**\n   * convert from fabric to textarea values\n   */\n  fromGraphemeToStringSelection(\n    start: number,\n    end: number,\n    graphemes: string[],\n  ) {\n    const smallerTextStart = graphemes.slice(0, start),\n      graphemeStart = smallerTextStart.join('').length;\n    if (start === end) {\n      return { selectionStart: graphemeStart, selectionEnd: graphemeStart };\n    }\n    const smallerTextEnd = graphemes.slice(start, end),\n      graphemeEnd = smallerTextEnd.join('').length;\n    return {\n      selectionStart: graphemeStart,\n      selectionEnd: graphemeStart + graphemeEnd,\n    };\n  }\n\n  /**\n   * @private\n   */\n  _updateTextarea() {\n    this.cursorOffsetCache = {};\n    if (!this.hiddenTextarea) {\n      return;\n    }\n    if (!this.inCompositionMode) {\n      const newSelection = this.fromGraphemeToStringSelection(\n        this.selectionStart,\n        this.selectionEnd,\n        this._text,\n      );\n      this.hiddenTextarea.selectionStart = newSelection.selectionStart;\n      this.hiddenTextarea.selectionEnd = newSelection.selectionEnd;\n    }\n    this.updateTextareaPosition();\n  }\n\n  /**\n   * This function updates the text value from the hidden textarea and recalculates the text bounding box\n   * size and position.\n   * It is called by fabricJS internals, do not use it directly.\n   * @private\n   */\n  updateFromTextArea() {\n    const { hiddenTextarea, direction, textAlign, inCompositionMode } = this;\n    if (!hiddenTextarea) {\n      return;\n    }\n    // we want to anchor the textarea position depending on text alignment\n    // or in case of text justify depending on ltr/rtl direction.\n    // this.textAlign.replace('justify-', '') leverages the fact that our textAlign values all contain the word left/right/center,\n    // that match the originX values.\n    const anchorX: TOriginX =\n      textAlign !== JUSTIFY\n        ? (textAlign.replace('justify-', '') as TOriginX)\n        : direction === LTR\n          ? LEFT\n          : RIGHT;\n    const originalPosition = this.getPositionByOrigin(anchorX, 'top');\n    this.cursorOffsetCache = {};\n    this.text = hiddenTextarea.value;\n    this.set('dirty', true);\n    this.initDimensions();\n    this.setPositionByOrigin(originalPosition, anchorX, 'top');\n    this.setCoords();\n    const newSelection = this.fromStringToGraphemeSelection(\n      hiddenTextarea.selectionStart,\n      hiddenTextarea.selectionEnd,\n      hiddenTextarea.value,\n    );\n    this.selectionEnd = this.selectionStart = newSelection.selectionEnd;\n    if (!inCompositionMode) {\n      this.selectionStart = newSelection.selectionStart;\n    }\n    this.updateTextareaPosition();\n  }\n\n  /**\n   * @private\n   */\n  updateTextareaPosition() {\n    if (this.selectionStart === this.selectionEnd) {\n      const style = this._calcTextareaPosition();\n      this.hiddenTextarea!.style.left = style.left;\n      this.hiddenTextarea!.style.top = style.top;\n    }\n  }\n\n  /**\n   * @private\n   * @return {Object} style contains style for hiddenTextarea\n   */\n  _calcTextareaPosition() {\n    if (!this.canvas) {\n      return { left: '1px', top: '1px' };\n    }\n    const desiredPosition = this.inCompositionMode\n        ? this.compositionStart\n        : this.selectionStart,\n      boundaries = this._getCursorBoundaries(desiredPosition),\n      cursorLocation = this.get2DCursorLocation(desiredPosition),\n      lineIndex = cursorLocation.lineIndex,\n      charIndex = cursorLocation.charIndex,\n      charHeight =\n        this.getValueOfPropertyAt(lineIndex, charIndex, 'fontSize') *\n        this.lineHeight,\n      leftOffset = boundaries.leftOffset,\n      retinaScaling = this.getCanvasRetinaScaling(),\n      upperCanvas = this.canvas.upperCanvasEl,\n      upperCanvasWidth = upperCanvas.width / retinaScaling,\n      upperCanvasHeight = upperCanvas.height / retinaScaling,\n      maxWidth = upperCanvasWidth - charHeight,\n      maxHeight = upperCanvasHeight - charHeight;\n\n    const p = new Point(\n      boundaries.left + leftOffset,\n      boundaries.top + boundaries.topOffset + charHeight,\n    )\n      .transform(this.calcTransformMatrix())\n      .transform(this.canvas.viewportTransform)\n      .multiply(\n        new Point(\n          upperCanvas.clientWidth / upperCanvasWidth,\n          upperCanvas.clientHeight / upperCanvasHeight,\n        ),\n      );\n\n    if (p.x < 0) {\n      p.x = 0;\n    }\n    if (p.x > maxWidth) {\n      p.x = maxWidth;\n    }\n    if (p.y < 0) {\n      p.y = 0;\n    }\n    if (p.y > maxHeight) {\n      p.y = maxHeight;\n    }\n\n    // add canvas offset on document\n    p.x += this.canvas._offset.left;\n    p.y += this.canvas._offset.top;\n\n    return {\n      left: `${p.x}px`,\n      top: `${p.y}px`,\n      fontSize: `${charHeight}px`,\n      charHeight: charHeight,\n    };\n  }\n\n  /**\n   * @private\n   */\n  _saveEditingProps() {\n    this._savedProps = {\n      hasControls: this.hasControls,\n      borderColor: this.borderColor,\n      lockMovementX: this.lockMovementX,\n      lockMovementY: this.lockMovementY,\n      hoverCursor: this.hoverCursor,\n      selectable: this.selectable,\n      defaultCursor: this.canvas && this.canvas.defaultCursor,\n      moveCursor: this.canvas && this.canvas.moveCursor,\n    };\n  }\n\n  /**\n   * @private\n   */\n  _restoreEditingProps() {\n    if (!this._savedProps) {\n      return;\n    }\n\n    this.hoverCursor = this._savedProps.hoverCursor;\n    this.hasControls = this._savedProps.hasControls;\n    this.borderColor = this._savedProps.borderColor;\n    this.selectable = this._savedProps.selectable;\n    this.lockMovementX = this._savedProps.lockMovementX;\n    this.lockMovementY = this._savedProps.lockMovementY;\n\n    if (this.canvas) {\n      this.canvas.defaultCursor =\n        this._savedProps.defaultCursor || this.canvas.defaultCursor;\n      this.canvas.moveCursor =\n        this._savedProps.moveCursor || this.canvas.moveCursor;\n    }\n\n    delete this._savedProps;\n  }\n\n  /**\n   * runs the actual logic that exits from editing state, see {@link exitEditing}\n   * But it does not fire events\n   */\n  exitEditingImpl() {\n    const hiddenTextarea = this.hiddenTextarea;\n    this.selected = false;\n    this.isEditing = false;\n\n    if (hiddenTextarea) {\n      hiddenTextarea.blur && hiddenTextarea.blur();\n      hiddenTextarea.parentNode &&\n        hiddenTextarea.parentNode.removeChild(hiddenTextarea);\n    }\n    this.hiddenTextarea = null;\n    this.abortCursorAnimation();\n    this.selectionStart !== this.selectionEnd && this.clearContextTop();\n    this.selectionEnd = this.selectionStart;\n    this._restoreEditingProps();\n    if (this._forceClearCache) {\n      this.initDimensions();\n      this.setCoords();\n    }\n  }\n\n  /**\n   * Exits from editing state and fires relevant events\n   */\n  exitEditing() {\n    const isTextChanged = this._textBeforeEdit !== this.text;\n    this.exitEditingImpl();\n\n    this.fire('editing:exited');\n    isTextChanged && this.fire(MODIFIED);\n    if (this.canvas) {\n      this.canvas.fire('text:editing:exited', {\n        target: this as unknown as IText,\n      });\n      // todo: evaluate add an action to this event\n      isTextChanged && this.canvas.fire('object:modified', { target: this });\n    }\n    return this;\n  }\n\n  /**\n   * @private\n   */\n  _removeExtraneousStyles() {\n    for (const prop in this.styles) {\n      if (!this._textLines[prop as unknown as number]) {\n        delete this.styles[prop];\n      }\n    }\n  }\n\n  /**\n   * remove and reflow a style block from start to end.\n   * @param {Number} start linear start position for removal (included in removal)\n   * @param {Number} end linear end position for removal ( excluded from removal )\n   */\n  removeStyleFromTo(start: number, end: number) {\n    const { lineIndex: lineStart, charIndex: charStart } =\n        this.get2DCursorLocation(start, true),\n      { lineIndex: lineEnd, charIndex: charEnd } = this.get2DCursorLocation(\n        end,\n        true,\n      );\n    if (lineStart !== lineEnd) {\n      // step1 remove the trailing of lineStart\n      if (this.styles[lineStart]) {\n        for (\n          let i = charStart;\n          i < this._unwrappedTextLines[lineStart].length;\n          i++\n        ) {\n          delete this.styles[lineStart][i];\n        }\n      }\n      // step2 move the trailing of lineEnd to lineStart if needed\n      if (this.styles[lineEnd]) {\n        for (\n          let i = charEnd;\n          i < this._unwrappedTextLines[lineEnd].length;\n          i++\n        ) {\n          const styleObj = this.styles[lineEnd][i];\n          if (styleObj) {\n            this.styles[lineStart] || (this.styles[lineStart] = {});\n            this.styles[lineStart][charStart + i - charEnd] = styleObj;\n          }\n        }\n      }\n      // step3 detects lines will be completely removed.\n      for (let i = lineStart + 1; i <= lineEnd; i++) {\n        delete this.styles[i];\n      }\n      // step4 shift remaining lines.\n      this.shiftLineStyles(lineEnd, lineStart - lineEnd);\n    } else {\n      // remove and shift left on the same line\n      if (this.styles[lineStart]) {\n        const styleObj = this.styles[lineStart];\n        const diff = charEnd - charStart;\n        for (let i = charStart; i < charEnd; i++) {\n          delete styleObj[i];\n        }\n        for (const char in this.styles[lineStart]) {\n          const numericChar = parseInt(char, 10);\n          if (numericChar >= charEnd) {\n            styleObj[numericChar - diff] = styleObj[char];\n            delete styleObj[char];\n          }\n        }\n      }\n    }\n  }\n\n  /**\n   * Shifts line styles up or down\n   * @param {Number} lineIndex Index of a line\n   * @param {Number} offset Can any number?\n   */\n  shiftLineStyles(lineIndex: number, offset: number) {\n    const clonedStyles = Object.assign({}, this.styles);\n    for (const line in this.styles) {\n      const numericLine = parseInt(line, 10);\n      if (numericLine > lineIndex) {\n        this.styles[numericLine + offset] = clonedStyles[numericLine];\n        if (!clonedStyles[numericLine - offset]) {\n          delete this.styles[numericLine];\n        }\n      }\n    }\n  }\n\n  /**\n   * Handle insertion of more consecutive style lines for when one or more\n   * newlines gets added to the text. Since current style needs to be shifted\n   * first we shift the current style of the number lines needed, then we add\n   * new lines from the last to the first.\n   * @param {Number} lineIndex Index of a line\n   * @param {Number} charIndex Index of a char\n   * @param {Number} qty number of lines to add\n   * @param {Array} copiedStyle Array of objects styles\n   */\n  insertNewlineStyleObject(\n    lineIndex: number,\n    charIndex: number,\n    qty: number,\n    copiedStyle?: { [index: number]: TextStyleDeclaration },\n  ) {\n    const newLineStyles: { [index: number]: TextStyleDeclaration } = {};\n    const originalLineLength = this._unwrappedTextLines[lineIndex].length;\n    const isEndOfLine = originalLineLength === charIndex;\n\n    let someStyleIsCarryingOver = false;\n    qty || (qty = 1);\n    this.shiftLineStyles(lineIndex, qty);\n    const currentCharStyle = this.styles[lineIndex]\n      ? this.styles[lineIndex][charIndex === 0 ? charIndex : charIndex - 1]\n      : undefined;\n\n    // we clone styles of all chars\n    // after cursor onto the current line\n    for (const index in this.styles[lineIndex]) {\n      const numIndex = parseInt(index, 10);\n      if (numIndex >= charIndex) {\n        someStyleIsCarryingOver = true;\n        newLineStyles[numIndex - charIndex] = this.styles[lineIndex][index];\n        // remove lines from the previous line since they're on a new line now\n        if (!(isEndOfLine && charIndex === 0)) {\n          delete this.styles[lineIndex][index];\n        }\n      }\n    }\n    let styleCarriedOver = false;\n    if (someStyleIsCarryingOver && !isEndOfLine) {\n      // if is end of line, the extra style we copied\n      // is probably not something we want\n      this.styles[lineIndex + qty] = newLineStyles;\n      styleCarriedOver = true;\n    }\n    if (styleCarriedOver || originalLineLength > charIndex) {\n      // skip the last line of since we already prepared it.\n      // or contains text without style that 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(quantity--) {\n        if (!Object.keys(copiedStyle[quantity]).length) {\n          continue;\n        }\n        if (!this.styles[lineIndex]) {\n          this.styles[lineIndex] = {};\n        }\n        this.styles[lineIndex][charIndex + quantity] = {\n          ...copiedStyle[quantity],\n        };\n      }\n      return;\n    }\n    if (!currentLineStyles) {\n      return;\n    }\n    const newStyle = currentLineStyles[charIndex ? charIndex - 1 : 1];\n    while (newStyle && quantity--) {\n      this.styles[lineIndex][charIndex + quantity] = { ...newStyle };\n    }\n  }\n\n  /**\n   * Inserts style object(s)\n   * @param {Array} insertedText Characters at the location where style is inserted\n   * @param {Number} start cursor index for inserting style\n   * @param {Array} [copiedStyle] array of style objects to insert.\n   */\n  insertNewStyleBlock(\n    insertedText: string[],\n    start: number,\n    copiedStyle?: TextStyleDeclaration[],\n  ) {\n    const cursorLoc = 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this.insertCharStyleObject(\n          cursorLoc.lineIndex + i,\n          0,\n          addedLines[i],\n          copiedStyle,\n        );\n      } else if (copiedStyle) {\n        // this test is required in order to close #6841\n        // when a pasted buffer begins with a newline then\n        // this.styles[cursorLoc.lineIndex + i] and copiedStyle[0]\n        // may be undefined for some reason\n        if (this.styles[cursorLoc.lineIndex + i] && copiedStyle[0]) {\n          this.styles[cursorLoc.lineIndex + i][0] = copiedStyle[0];\n        }\n      }\n      copiedStyle = copiedStyle && copiedStyle.slice(addedLines[i] + 1);\n    }\n    if (addedLines[i] > 0) {\n      this.insertCharStyleObject(\n        cursorLoc.lineIndex + i,\n        0,\n        addedLines[i],\n        copiedStyle,\n      );\n    }\n  }\n\n  /**\n   * Removes characters from start/end\n   * start/end ar per grapheme position in _text array.\n   *\n   * @param {Number} start\n   * @param {Number} end default to 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