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- /**
- * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
- */
- /**
- * @module engine/view/selection
- */
- import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
- import Range from './range';
- import Position from './position';
- import mix from '@ckeditor/ckeditor5-utils/src/mix';
- import EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';
- import Node from './node';
- import Element from './element';
- import count from '@ckeditor/ckeditor5-utils/src/count';
- import isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';
- import DocumentSelection from './documentselection';
- /**
- * Class representing an arbirtary selection in the view.
- * See also {@link module:engine/view/documentselection~DocumentSelection}.
- *
- * New selection instances can be created via the constructor or one these methods:
- *
- * * {@link module:engine/view/view~View#createSelection `View#createSelection()`},
- * * {@link module:engine/view/upcastwriter~UpcastWriter#createSelection `UpcastWriter#createSelection()`}.
- *
- * A selection can consist of {@link module:engine/view/range~Range ranges} that can be set by using
- * the {@link module:engine/view/selection~Selection#setTo `Selection#setTo()`} method.
- */
- export default class Selection {
- /**
- * Creates new selection instance.
- *
- * **Note**: The selection constructor is available as a factory method:
- *
- * * {@link module:engine/view/view~View#createSelection `View#createSelection()`},
- * * {@link module:engine/view/upcastwriter~UpcastWriter#createSelection `UpcastWriter#createSelection()`}.
- *
- * // Creates empty selection without ranges.
- * const selection = writer.createSelection();
- *
- * // Creates selection at the given range.
- * const range = writer.createRange( start, end );
- * const selection = writer.createSelection( range );
- *
- * // Creates selection at the given ranges
- * const ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];
- * const selection = writer.createSelection( ranges );
- *
- * // Creates selection from the other selection.
- * const otherSelection = writer.createSelection();
- * const selection = writer.createSelection( otherSelection );
- *
- * // Creates selection from the document selection.
- * const selection = writer.createSelection( editor.editing.view.document.selection );
- *
- * // Creates selection at the given position.
- * const position = writer.createPositionFromPath( root, path );
- * const selection = writer.createSelection( position );
- *
- * // Creates collapsed selection at the position of given item and offset.
- * const paragraph = writer.createContainerElement( 'paragraph' );
- * const selection = writer.createSelection( paragraph, offset );
- *
- * // Creates a range inside an {@link module:engine/view/element~Element element} which starts before the
- * // first child of that element and ends after the last child of that element.
- * const selection = writer.createSelection( paragraph, 'in' );
- *
- * // Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends
- * // just after the item.
- * const selection = writer.createSelection( paragraph, 'on' );
- *
- * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.
- *
- * // Creates backward selection.
- * const selection = writer.createSelection( range, { backward: true } );
- *
- * Fake selection does not render as browser native selection over selected elements and is hidden to the user.
- * This way, no native selection UI artifacts are displayed to the user and selection over elements can be
- * represented in other way, for example by applying proper CSS class.
- *
- * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM
- * (and be properly handled by screen readers).
- *
- * // Creates fake selection with label.
- * const selection = writer.createSelection( range, { fake: true, label: 'foo' } );
- *
- * @param {module:engine/view/selection~Selectable} [selectable=null]
- * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.
- * @param {Object} [options]
- * @param {Boolean} [options.backward] Sets this selection instance to be backward.
- * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.
- * @param {String} [options.label] Label for the fake selection.
- */
- constructor( selectable = null, placeOrOffset, options ) {
- /**
- * Stores all ranges that are selected.
- *
- * @protected
- * @member {Array.<module:engine/view/range~Range>}
- */
- this._ranges = [];
- /**
- * Specifies whether the last added range was added as a backward or forward range.
- *
- * @protected
- * @member {Boolean}
- */
- this._lastRangeBackward = false;
- /**
- * Specifies whether selection instance is fake.
- *
- * @private
- * @member {Boolean}
- */
- this._isFake = false;
- /**
- * Fake selection's label.
- *
- * @private
- * @member {String}
- */
- this._fakeSelectionLabel = '';
- this.setTo( selectable, placeOrOffset, options );
- }
- /**
- * Returns true if selection instance is marked as `fake`.
- *
- * @see #setTo
- * @returns {Boolean}
- */
- get isFake() {
- return this._isFake;
- }
- /**
- * Returns fake selection label.
- *
- * @see #setTo
- * @returns {String}
- */
- get fakeSelectionLabel() {
- return this._fakeSelectionLabel;
- }
- /**
- * Selection anchor. Anchor may be described as a position where the selection starts. Together with
- * {@link #focus focus} they define the direction of selection, which is important
- * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.
- * It may be a bit unintuitive when there are multiple ranges in selection.
- *
- * @see #focus
- * @type {module:engine/view/position~Position}
- */
- get anchor() {
- if ( !this._ranges.length ) {
- return null;
- }
- const range = this._ranges[ this._ranges.length - 1 ];
- const anchor = this._lastRangeBackward ? range.end : range.start;
- return anchor.clone();
- }
- /**
- * Selection focus. Focus is a position where the selection ends.
- *
- * @see #anchor
- * @type {module:engine/view/position~Position}
- */
- get focus() {
- if ( !this._ranges.length ) {
- return null;
- }
- const range = this._ranges[ this._ranges.length - 1 ];
- const focus = this._lastRangeBackward ? range.start : range.end;
- return focus.clone();
- }
- /**
- * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is
- * collapsed.
- *
- * @type {Boolean}
- */
- get isCollapsed() {
- return this.rangeCount === 1 && this._ranges[ 0 ].isCollapsed;
- }
- /**
- * Returns number of ranges in selection.
- *
- * @type {Number}
- */
- get rangeCount() {
- return this._ranges.length;
- }
- /**
- * Specifies whether the {@link #focus} precedes {@link #anchor}.
- *
- * @type {Boolean}
- */
- get isBackward() {
- return !this.isCollapsed && this._lastRangeBackward;
- }
- /**
- * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`
- * if the selection is not inside an editable element.
- *
- * @type {module:engine/view/editableelement~EditableElement|null}
- */
- get editableElement() {
- if ( this.anchor ) {
- return this.anchor.editableElement;
- }
- return null;
- }
- /**
- * Returns an iterable that contains copies of all ranges added to the selection.
- *
- * @returns {Iterable.<module:engine/view/range~Range>}
- */
- * getRanges() {
- for ( const range of this._ranges ) {
- yield range.clone();
- }
- }
- /**
- * Returns copy of the first range in the selection. First range is the one which
- * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start
- * position of all other ranges (not to confuse with the first range added to the selection).
- * Returns `null` if no ranges are added to selection.
- *
- * @returns {module:engine/view/range~Range|null}
- */
- getFirstRange() {
- let first = null;
- for ( const range of this._ranges ) {
- if ( !first || range.start.isBefore( first.start ) ) {
- first = range;
- }
- }
- return first ? first.clone() : null;
- }
- /**
- * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}
- * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse
- * with the last range added to the selection). Returns `null` if no ranges are added to selection.
- *
- * @returns {module:engine/view/range~Range|null}
- */
- getLastRange() {
- let last = null;
- for ( const range of this._ranges ) {
- if ( !last || range.end.isAfter( last.end ) ) {
- last = range;
- }
- }
- return last ? last.clone() : null;
- }
- /**
- * Returns copy of the first position in the selection. First position is the position that
- * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.
- * Returns `null` if no ranges are added to selection.
- *
- * @returns {module:engine/view/position~Position|null}
- */
- getFirstPosition() {
- const firstRange = this.getFirstRange();
- return firstRange ? firstRange.start.clone() : null;
- }
- /**
- * Returns copy of the last position in the selection. Last position is the position that
- * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.
- * Returns `null` if no ranges are added to selection.
- *
- * @returns {module:engine/view/position~Position|null}
- */
- getLastPosition() {
- const lastRange = this.getLastRange();
- return lastRange ? lastRange.end.clone() : null;
- }
- /**
- * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,
- * same number of ranges and all ranges from one selection equal to a range from other selection.
- *
- * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection
- * Selection to compare with.
- * @returns {Boolean} `true` if selections are equal, `false` otherwise.
- */
- isEqual( otherSelection ) {
- if ( this.isFake != otherSelection.isFake ) {
- return false;
- }
- if ( this.isFake && this.fakeSelectionLabel != otherSelection.fakeSelectionLabel ) {
- return false;
- }
- if ( this.rangeCount != otherSelection.rangeCount ) {
- return false;
- } else if ( this.rangeCount === 0 ) {
- return true;
- }
- if ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {
- return false;
- }
- for ( const thisRange of this._ranges ) {
- let found = false;
- for ( const otherRange of otherSelection._ranges ) {
- if ( thisRange.isEqual( otherRange ) ) {
- found = true;
- break;
- }
- }
- if ( !found ) {
- return false;
- }
- }
- return true;
- }
- /**
- * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same
- * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are
- * equal to any trimmed range from other selection.
- *
- * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection
- * Selection to compare with.
- * @returns {Boolean} `true` if selections are similar, `false` otherwise.
- */
- isSimilar( otherSelection ) {
- if ( this.isBackward != otherSelection.isBackward ) {
- return false;
- }
- const numOfRangesA = count( this.getRanges() );
- const numOfRangesB = count( otherSelection.getRanges() );
- // If selections have different number of ranges, they cannot be similar.
- if ( numOfRangesA != numOfRangesB ) {
- return false;
- }
- // If both selections have no ranges, they are similar.
- if ( numOfRangesA == 0 ) {
- return true;
- }
- // Check if each range in one selection has a similar range in other selection.
- for ( let rangeA of this.getRanges() ) {
- rangeA = rangeA.getTrimmed();
- let found = false;
- for ( let rangeB of otherSelection.getRanges() ) {
- rangeB = rangeB.getTrimmed();
- if ( rangeA.start.isEqual( rangeB.start ) && rangeA.end.isEqual( rangeB.end ) ) {
- found = true;
- break;
- }
- }
- // For `rangeA`, neither range in `otherSelection` was similar. So selections are not similar.
- if ( !found ) {
- return false;
- }
- }
- // There were no ranges that weren't matched. Selections are similar.
- return true;
- }
- /**
- * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only
- * one range in the selection, and that range contains exactly one element.
- * Returns `null` if there is no selected element.
- *
- * @returns {module:engine/view/element~Element|null}
- */
- getSelectedElement() {
- if ( this.rangeCount !== 1 ) {
- return null;
- }
- const range = this.getFirstRange();
- let nodeAfterStart = range.start.nodeAfter;
- let nodeBeforeEnd = range.end.nodeBefore;
- // Handle the situation when selection position is at the beginning / at the end of a text node.
- // In such situation `.nodeAfter` and `.nodeBefore` are `null` but the selection still might be spanning
- // over one element.
- //
- // <p>Foo{<span class="widget"></span>}bar</p> vs <p>Foo[<span class="widget"></span>]bar</p>
- //
- // These are basically the same selections, only the difference is if the selection position is at
- // at the end/at the beginning of a text node or just before/just after the text node.
- //
- if ( range.start.parent.is( 'text' ) && range.start.isAtEnd && range.start.parent.nextSibling ) {
- nodeAfterStart = range.start.parent.nextSibling;
- }
- if ( range.end.parent.is( 'text' ) && range.end.isAtStart && range.end.parent.previousSibling ) {
- nodeBeforeEnd = range.end.parent.previousSibling;
- }
- return ( nodeAfterStart instanceof Element && nodeAfterStart == nodeBeforeEnd ) ? nodeAfterStart : null;
- }
- /**
- * Sets this selection's ranges and direction to the specified location based on the given
- * {@link module:engine/view/selection~Selectable selectable}.
- *
- * // Sets selection to the given range.
- * const range = writer.createRange( start, end );
- * selection.setTo( range );
- *
- * // Sets selection to given ranges.
- * const ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];
- * selection.setTo( range );
- *
- * // Sets selection to the other selection.
- * const otherSelection = writer.createSelection();
- * selection.setTo( otherSelection );
- *
- * // Sets selection to contents of DocumentSelection.
- * selection.setTo( editor.editing.view.document.selection );
- *
- * // Sets collapsed selection at the given position.
- * const position = writer.createPositionAt( root, path );
- * selection.setTo( position );
- *
- * // Sets collapsed selection at the position of given item and offset.
- * selection.setTo( paragraph, offset );
- *
- * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of
- * that element and ends after the last child of that element.
- *
- * selection.setTo( paragraph, 'in' );
- *
- * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.
- *
- * selection.setTo( paragraph, 'on' );
- *
- * // Clears selection. Removes all ranges.
- * selection.setTo( null );
- *
- * `Selection#setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.
- *
- * // Sets selection as backward.
- * selection.setTo( range, { backward: true } );
- *
- * Fake selection does not render as browser native selection over selected elements and is hidden to the user.
- * This way, no native selection UI artifacts are displayed to the user and selection over elements can be
- * represented in other way, for example by applying proper CSS class.
- *
- * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM
- * (and be properly handled by screen readers).
- *
- * // Creates fake selection with label.
- * selection.setTo( range, { fake: true, label: 'foo' } );
- *
- * @fires change
- * @param {module:engine/view/selection~Selectable} selectable
- * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.
- * @param {Object} [options]
- * @param {Boolean} [options.backward] Sets this selection instance to be backward.
- * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.
- * @param {String} [options.label] Label for the fake selection.
- */
- setTo( selectable, placeOrOffset, options ) {
- if ( selectable === null ) {
- this._setRanges( [] );
- this._setFakeOptions( placeOrOffset );
- } else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {
- this._setRanges( selectable.getRanges(), selectable.isBackward );
- this._setFakeOptions( { fake: selectable.isFake, label: selectable.fakeSelectionLabel } );
- } else if ( selectable instanceof Range ) {
- this._setRanges( [ selectable ], placeOrOffset && placeOrOffset.backward );
- this._setFakeOptions( placeOrOffset );
- } else if ( selectable instanceof Position ) {
- this._setRanges( [ new Range( selectable ) ] );
- this._setFakeOptions( placeOrOffset );
- } else if ( selectable instanceof Node ) {
- const backward = !!options && !!options.backward;
- let range;
- if ( placeOrOffset === undefined ) {
- /**
- * selection.setTo requires the second parameter when the first parameter is a node.
- *
- * @error view-selection-setTo-required-second-parameter
- */
- throw new CKEditorError(
- 'view-selection-setTo-required-second-parameter: ' +
- 'selection.setTo requires the second parameter when the first parameter is a node.',
- this
- );
- } else if ( placeOrOffset == 'in' ) {
- range = Range._createIn( selectable );
- } else if ( placeOrOffset == 'on' ) {
- range = Range._createOn( selectable );
- } else {
- range = new Range( Position._createAt( selectable, placeOrOffset ) );
- }
- this._setRanges( [ range ], backward );
- this._setFakeOptions( options );
- } else if ( isIterable( selectable ) ) {
- // We assume that the selectable is an iterable of ranges.
- // Array.from() is used to prevent setting ranges to the old iterable
- this._setRanges( selectable, placeOrOffset && placeOrOffset.backward );
- this._setFakeOptions( placeOrOffset );
- } else {
- /**
- * Cannot set selection to given place.
- *
- * @error view-selection-setTo-not-selectable
- */
- throw new CKEditorError( 'view-selection-setTo-not-selectable: Cannot set selection to given place.', this );
- }
- this.fire( 'change' );
- }
- /**
- * Moves {@link #focus} to the specified location.
- *
- * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}
- * parameters.
- *
- * @fires change
- * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition
- * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when
- * first parameter is a {@link module:engine/view/item~Item view item}.
- */
- setFocus( itemOrPosition, offset ) {
- if ( this.anchor === null ) {
- /**
- * Cannot set selection focus if there are no ranges in selection.
- *
- * @error view-selection-setFocus-no-ranges
- */
- throw new CKEditorError(
- 'view-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.',
- this
- );
- }
- const newFocus = Position._createAt( itemOrPosition, offset );
- if ( newFocus.compareWith( this.focus ) == 'same' ) {
- return;
- }
- const anchor = this.anchor;
- this._ranges.pop();
- if ( newFocus.compareWith( anchor ) == 'before' ) {
- this._addRange( new Range( newFocus, anchor ), true );
- } else {
- this._addRange( new Range( anchor, newFocus ) );
- }
- this.fire( 'change' );
- }
- /**
- * Method verifies if the checked object belongs to a given a type. Type's name might be prefixed with a `view:` string,
- * for example `view:selection`. Type is a string which usually equal to a name of the class written in camelCase convention.
- * If the object is a class instance, which has a parent class with `is()` method, then type verification returns `true`
- * for any type match for an entire child-parent chain.
- *
- * const selection = new Selection( ... );
- *
- * selection.is( 'selection' ); // true
- * selection.is( 'view:selection' ); // true
- * selection.is( 'node' ); // false
- * selection.is( 'element' ); // false
- *
- * Acceptable type for this class is `selection` and its prefixed version.
- *
- * See also: {@link module:engine/view/node~Node#is `Node#is()`}.
- *
- * @param {String} type
- * @returns {Boolean}
- */
- is( type ) {
- return type == 'selection' || type == 'view:selection';
- }
- /**
- * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array
- * is treated like the last added range and is used to set {@link #anchor anchor} and {@link #focus focus}.
- * Accepts a flag describing in which way the selection is made.
- *
- * @private
- * @param {Iterable.<module:engine/view/range~Range>} newRanges Iterable object of ranges to set.
- * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end
- * (`false`) or backward - from end to start (`true`). Defaults to `false`.
- */
- _setRanges( newRanges, isLastBackward = false ) {
- // New ranges should be copied to prevent removing them by setting them to `[]` first.
- // Only applies to situations when selection is set to the same selection or same selection's ranges.
- newRanges = Array.from( newRanges );
- this._ranges = [];
- for ( const range of newRanges ) {
- this._addRange( range );
- }
- this._lastRangeBackward = !!isLastBackward;
- }
- /**
- * Sets this selection instance to be marked as `fake`. A fake selection does not render as browser native selection
- * over selected elements and is hidden to the user. This way, no native selection UI artifacts are displayed to
- * the user and selection over elements can be represented in other way, for example by applying proper CSS class.
- *
- * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM (and be
- * properly handled by screen readers).
- *
- * @private
- * @param {Object} [options] Options.
- * @param {Boolean} [options.fake] If set to true selection will be marked as `fake`.
- * @param {String} [options.label=''] Fake selection label.
- */
- _setFakeOptions( options = {} ) {
- this._isFake = !!options.fake;
- this._fakeSelectionLabel = options.fake ? options.label || '' : '';
- }
- /**
- * Adds a range to the selection. Added range is copied. This means that passed range is not saved in the
- * selection instance and you can safely operate on it.
- *
- * Accepts a flag describing in which way the selection is made - passed range might be selected from
- * {@link module:engine/view/range~Range#start start} to {@link module:engine/view/range~Range#end end}
- * or from {@link module:engine/view/range~Range#end end} to {@link module:engine/view/range~Range#start start}.
- * The flag is used to set {@link #anchor anchor} and {@link #focus focus} properties.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects
- * with ranges already stored in Selection instance.
- *
- * @private
- * @fires change
- * @param {module:engine/view/range~Range} range
- * @param {Boolean} [isBackward]
- */
- _addRange( range, isBackward = false ) {
- if ( !( range instanceof Range ) ) {
- /**
- * Selection range set to an object that is not an instance of {@link module:engine/view/range~Range}.
- *
- * @error view-selection-add-range-not-range
- */
- throw new CKEditorError(
- 'view-selection-add-range-not-range: ' +
- 'Selection range set to an object that is not an instance of view.Range',
- this
- );
- }
- this._pushRange( range );
- this._lastRangeBackward = !!isBackward;
- }
- /**
- * Adds range to selection - creates copy of given range so it can be safely used and modified.
- *
- * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects
- * with ranges already stored in selection instance.
- *
- * @private
- * @param {module:engine/view/range~Range} range
- */
- _pushRange( range ) {
- for ( const storedRange of this._ranges ) {
- if ( range.isIntersecting( storedRange ) ) {
- /**
- * Trying to add a range that intersects with another range from selection.
- *
- * @error view-selection-range-intersects
- * @param {module:engine/view/range~Range} addedRange Range that was added to the selection.
- * @param {module:engine/view/range~Range} intersectingRange Range from selection that intersects with `addedRange`.
- */
- throw new CKEditorError(
- 'view-selection-range-intersects: Trying to add a range that intersects with another range from selection.',
- this,
- { addedRange: range, intersectingRange: storedRange }
- );
- }
- }
- this._ranges.push( new Range( range.start, range.end ) );
- }
- /**
- * Fired whenever selection ranges are changed through {@link ~Selection Selection API}.
- *
- * @event change
- */
- }
- mix( Selection, EmitterMixin );
- /**
- * An entity that is used to set selection.
- *
- * See also {@link module:engine/view/selection~Selection#setTo}
- *
- * @typedef {
- * module:engine/view/selection~Selection|
- * module:engine/view/documentselection~DocumentSelection|
- * module:engine/view/position~Position|
- * Iterable.<module:engine/view/range~Range>|
- * module:engine/view/range~Range|
- * module:engine/view/item~Item|
- * null
- * } module:engine/view/selection~Selectable
- */
|