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All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport Rect from '@ckeditor/ckeditor5-utils/src/dom/rect';\n\n/**\n * @module widget/verticalnavigationhandler\n */\n\n/**\n * Returns 'keydown' handler for up/down arrow keys that modifies the caret movement if it's in a text line next to an object.\n *\n * @param {module:engine/controller/editingcontroller~EditingController} editing The editing controller.\n * @returns {Function}\n */\nexport default function verticalNavigationHandler( editing ) {\n\tconst model = editing.model;\n\n\treturn ( evt, data ) => {\n\t\tconst arrowUpPressed = data.keyCode == keyCodes.arrowup;\n\t\tconst arrowDownPressed = data.keyCode == keyCodes.arrowdown;\n\t\tconst expandSelection = data.shiftKey;\n\t\tconst selection = model.document.selection;\n\n\t\tif ( !arrowUpPressed && !arrowDownPressed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst isForward = arrowDownPressed;\n\n\t\t// Navigation is in the opposite direction than the selection direction so this is shrinking of the selection.\n\t\t// Selection for sure will not approach any object.\n\t\tif ( expandSelection && selectionWillShrink( selection, isForward ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Find a range between selection and closest limit element.\n\t\tconst range = findTextRangeFromSelection( editing, selection, isForward );\n\n\t\tif ( !range || range.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If the range is a single line (there is no word wrapping) then move the selection to the position closest to the limit element.\n\t\t//\n\t\t// We can't move the selection directly to the isObject element (eg. table cell) because of dual position at the end/beginning\n\t\t// of wrapped line (it's at the same time at the end of one line and at the start of the next line).\n\t\tif ( isSingleLineRange( editing, range, isForward ) ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\tconst newPosition = isForward ? range.end : range.start;\n\n\t\t\t\tif ( expandSelection ) {\n\t\t\t\t\tconst newSelection = model.createSelection( selection.anchor );\n\t\t\t\t\tnewSelection.setFocus( newPosition );\n\n\t\t\t\t\twriter.setSelection( newSelection );\n\t\t\t\t} else {\n\t\t\t\t\twriter.setSelection( newPosition );\n\t\t\t\t}\n\t\t\t} );\n\n\t\t\tevt.stop();\n\t\t\tdata.preventDefault();\n\t\t\tdata.stopPropagation();\n\t\t}\n\t};\n}\n\n// Finds the range between selection and closest limit element (in the direction of navigation).\n// The position next to limit element is adjusted to the closest allowed `$text` position.\n//\n// Returns `null` if, according to the schema, the resulting range cannot contain a `$text` element.\n//\n// @param {module:engine/controller/editingcontroller~EditingController} editing The editing controller.\n// @param {module:engine/model/selection~Selection} selection The current selection.\n// @param {Boolean} isForward The expected navigation direction.\n// @returns {module:engine/model/range~Range|null}\n//\nfunction findTextRangeFromSelection( editing, selection, isForward ) {\n\tconst model = editing.model;\n\n\tif ( isForward ) {\n\t\tconst startPosition = selection.isCollapsed ? selection.focus : selection.getLastPosition();\n\t\tconst endPosition = getNearestNonInlineLimit( model, startPosition, 'forward' );\n\n\t\t// There is no limit element, browser should handle this.\n\t\tif ( !endPosition ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst range = model.createRange( startPosition, endPosition );\n\t\tconst lastRangePosition = getNearestTextPosition( model.schema, range, 'backward' );\n\n\t\tif ( lastRangePosition && startPosition.isBefore( lastRangePosition ) ) {\n\t\t\treturn model.createRange( startPosition, lastRangePosition );\n\t\t}\n\n\t\treturn null;\n\t} else {\n\t\tconst endPosition = selection.isCollapsed ? selection.focus : selection.getFirstPosition();\n\t\tconst startPosition = getNearestNonInlineLimit( model, endPosition, 'backward' );\n\n\t\t// There is no limit element, browser should handle this.\n\t\tif ( !startPosition ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst range = model.createRange( startPosition, endPosition );\n\t\tconst firstRangePosition = getNearestTextPosition( model.schema, range, 'forward' );\n\n\t\tif ( firstRangePosition && endPosition.isAfter( firstRangePosition ) ) {\n\t\t\treturn model.createRange( firstRangePosition, endPosition );\n\t\t}\n\n\t\treturn null;\n\t}\n}\n\n// Finds the limit element position that is closest to startPosition.\n//\n// @param {module:engine/model/model~Model} model\n// @param {<module:engine/model/position~Position>} startPosition\n// @param {'forward'|'backward'} direction Search direction.\n// @returns {<module:engine/model/position~Position>|null}\n//\nfunction getNearestNonInlineLimit( model, startPosition, direction ) {\n\tconst schema = model.schema;\n\tconst range = model.createRangeIn( startPosition.root );\n\n\tconst walkerValueType = direction == 'forward' ? 'elementStart' : 'elementEnd';\n\n\tfor ( const { previousPosition, item, type } of range.getWalker( { startPosition, direction } ) ) {\n\t\tif ( schema.isLimit( item ) && !schema.isInline( item ) ) {\n\t\t\treturn previousPosition;\n\t\t}\n\n\t\t// Stop looking for isLimit element if the next element is a block element (it is for sure not single line).\n\t\tif ( type == walkerValueType && schema.isBlock( item ) ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn null;\n}\n\n// Basing on the provided range, finds the first or last (depending on `direction`) position inside the range\n// that can contain `$text` (according to schema).\n//\n// @param {module:engine/model/schema~Schema} schema The schema.\n// @param {module:engine/model/range~Range} range The range to find the position in.\n// @param {'forward'|'backward'} direction Search direction.\n// @returns {module:engine/model/position~Position} The nearest selection range.\n//\nfunction getNearestTextPosition( schema, range, direction ) {\n\tconst position = direction == 'backward' ? range.end : range.start;\n\n\tif ( schema.checkChild( position, '$text' ) ) {\n\t\treturn position;\n\t}\n\n\tfor ( const { nextPosition } of range.getWalker( { direction } ) ) {\n\t\tif ( schema.checkChild( nextPosition, '$text' ) ) {\n\t\t\treturn nextPosition;\n\t\t}\n\t}\n}\n\n// Checks if the DOM range corresponding to the provided model range renders as a single line by analyzing DOMRects\n// (verifying if they visually wrap content to the next line).\n//\n// @param {module:engine/controller/editingcontroller~EditingController} editing The editing controller.\n// @param {module:engine/model/range~Range} modelRange The current table cell content range.\n// @param {Boolean} isForward The expected navigation direction.\n// @returns {Boolean}\n//\nfunction isSingleLineRange( editing, modelRange, isForward ) {\n\tconst model = editing.model;\n\tconst domConverter = editing.view.domConverter;\n\n\t// Wrapped lines contain exactly the same position at the end of current line\n\t// and at the beginning of next line. That position's client rect is at the end\n\t// of current line. In case of caret at first position of the last line that 'dual'\n\t// position would be detected as it's not the last line.\n\tif ( isForward ) {\n\t\tconst probe = model.createSelection( modelRange.start );\n\n\t\tmodel.modifySelection( probe );\n\n\t\t// If the new position is at the end of the container then we can't use this position\n\t\t// because it would provide incorrect result for eg caption of image and selection\n\t\t// just before end of it. Also in this case there is no \"dual\" position.\n\t\tif ( !probe.focus.isAtEnd && !modelRange.start.isEqual( probe.focus ) ) {\n\t\t\tmodelRange = model.createRange( probe.focus, modelRange.end );\n\t\t}\n\t}\n\n\tconst viewRange = editing.mapper.toViewRange( modelRange );\n\tconst domRange = domConverter.viewRangeToDom( viewRange );\n\tconst rects = Rect.getDomRangeRects( domRange );\n\n\tlet boundaryVerticalPosition;\n\n\tfor ( const rect of rects ) {\n\t\tif ( boundaryVerticalPosition === undefined ) {\n\t\t\tboundaryVerticalPosition = Math.round( rect.bottom );\n\t\t\tcontinue;\n\t\t}\n\n\t\t// Let's check if this rect is in new line.\n\t\tif ( Math.round( rect.top ) >= boundaryVerticalPosition ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tboundaryVerticalPosition = Math.max( boundaryVerticalPosition, Math.round( rect.bottom ) );\n\t}\n\n\treturn true;\n}\n\nfunction selectionWillShrink( selection, isForward ) {\n\treturn !selection.isCollapsed && selection.isBackward == isForward;\n}\n"],"sourceRoot":""}