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✏️ Editing: SelectionOverrides.js

/**
 * SelectionOverrides.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This module contains logic overriding the selection with keyboard/mouse
 * around contentEditable=false regions.
 *
 * @example
 * // Disable the default cE=false selection
 * tinymce.activeEditor.on('ShowCaret ObjectSelected', function(e) {
 *     e.preventDefault();
 * });
 *
 * @private
 * @class tinymce.SelectionOverrides
 */
define("tinymce/SelectionOverrides", [
	"tinymce/Env",
	"tinymce/caret/CaretWalker",
	"tinymce/caret/CaretPosition",
	"tinymce/caret/CaretContainer",
	"tinymce/caret/CaretUtils",
	"tinymce/caret/FakeCaret",
	"tinymce/caret/LineWalker",
	"tinymce/caret/LineUtils",
	"tinymce/dom/NodeType",
	"tinymce/dom/RangeUtils",
	"tinymce/util/VK",
	"tinymce/util/Fun",
	"tinymce/util/Arr",
	"tinymce/util/Delay",
	"tinymce/DragDropOverrides"
], function(
	Env, CaretWalker, CaretPosition, CaretContainer, CaretUtils, FakeCaret, LineWalker,
	LineUtils, NodeType, RangeUtils, VK, Fun, Arr, Delay, DragDropOverrides
) {
	var curry = Fun.curry,
		isContentEditableTrue = NodeType.isContentEditableTrue,
		isContentEditableFalse = NodeType.isContentEditableFalse,
		isElement = NodeType.isElement,
		isAfterContentEditableFalse = CaretUtils.isAfterContentEditableFalse,
		isBeforeContentEditableFalse = CaretUtils.isBeforeContentEditableFalse,
		getSelectedNode = RangeUtils.getSelectedNode;

function getVisualCaretPosition(walkFn, caretPosition) {
		while ((caretPosition = walkFn(caretPosition))) {
			if (caretPosition.isVisible()) {
				return caretPosition;
			}
		}

return caretPosition;
	}

function SelectionOverrides(editor) {
		var rootNode = editor.getBody(), caretWalker = new CaretWalker(rootNode);
		var getNextVisualCaretPosition = curry(getVisualCaretPosition, caretWalker.next);
		var getPrevVisualCaretPosition = curry(getVisualCaretPosition, caretWalker.prev),
			fakeCaret = new FakeCaret(editor.getBody(), isBlock),
			realSelectionId = 'sel-' + editor.dom.uniqueId(),
			selectedContentEditableNode, $ = editor.$;

function isBlock(node) {
			return editor.dom.isBlock(node);
		}

function setRange(range) {
			//console.log('setRange', range);
			if (range) {
				editor.selection.setRng(range);
			}
		}

function getRange() {
			return editor.selection.getRng();
		}

function scrollIntoView(node, alignToTop) {
			editor.selection.scrollIntoView(node, alignToTop);
		}

function showCaret(direction, node, before) {
			var e;

e = editor.fire('ShowCaret', {
				target: node,
				direction: direction,
				before: before
			});

if (e.isDefaultPrevented()) {
				return null;
			}

scrollIntoView(node, direction === -1);

return fakeCaret.show(before, node);
		}

function selectNode(node) {
			var e;

e = editor.fire('ObjectSelected', {target: node});
			if (e.isDefaultPrevented()) {
				return null;
			}

fakeCaret.hide();
			return getNodeRange(node);
		}

function getNodeRange(node) {
			var rng = node.ownerDocument.createRange();

rng.selectNode(node);

return rng;
		}

function isMoveInsideSameBlock(fromCaretPosition, toCaretPosition) {
			var inSameBlock = CaretUtils.isInSameBlock(fromCaretPosition, toCaretPosition);

// Handle bogus BR abc| 
			if (!inSameBlock && NodeType.isBr(fromCaretPosition.getNode())) {
				return true;
			}

return inSameBlock;
		}

function getNormalizedRangeEndPoint(direction, range) {
			range = CaretUtils.normalizeRange(direction, rootNode, range);

if (direction == -1) {
				return CaretPosition.fromRangeStart(range);
			}

return CaretPosition.fromRangeEnd(range);
		}

function isRangeInCaretContainerBlock(range) {
			return CaretContainer.isCaretContainerBlock(range.startContainer);
		}

function moveToCeFalseHorizontally(direction, getNextPosFn, isBeforeContentEditableFalseFn, range) {
			var node, caretPosition, peekCaretPosition, rangeIsInContainerBlock;

if (!range.collapsed) {
				node = getSelectedNode(range);
				if (isContentEditableFalse(node)) {
					return showCaret(direction, node, direction == -1);
				}
			}

rangeIsInContainerBlock = isRangeInCaretContainerBlock(range);
			caretPosition = getNormalizedRangeEndPoint(direction, range);

if (isBeforeContentEditableFalseFn(caretPosition)) {
				return selectNode(caretPosition.getNode(direction == -1));
			}

caretPosition = getNextPosFn(caretPosition);
			if (!caretPosition) {
				if (rangeIsInContainerBlock) {
					return range;
				}

return null;
			}

if (isBeforeContentEditableFalseFn(caretPosition)) {
				return showCaret(direction, caretPosition.getNode(direction == -1), direction == 1);
			}

// Peek ahead for handling of ab|c -> abc|
			peekCaretPosition = getNextPosFn(caretPosition);
			if (isBeforeContentEditableFalseFn(peekCaretPosition)) {
				if (isMoveInsideSameBlock(caretPosition, peekCaretPosition)) {
					return showCaret(direction, peekCaretPosition.getNode(direction == -1), direction == 1);
				}
			}

if (rangeIsInContainerBlock) {
				return renderRangeCaret(caretPosition.toRange());
			}

return null;
		}

function moveToCeFalseVertically(direction, walkerFn, range) {
			var caretPosition, linePositions, nextLinePositions,
				closestNextLineRect, caretClientRect, clientX,
				dist1, dist2, contentEditableFalseNode;

contentEditableFalseNode = getSelectedNode(range);
			caretPosition = getNormalizedRangeEndPoint(direction, range);
			linePositions = walkerFn(rootNode, LineWalker.isAboveLine(1), caretPosition);
			nextLinePositions = Arr.filter(linePositions, LineWalker.isLine(1));
			caretClientRect = Arr.last(caretPosition.getClientRects());

if (isBeforeContentEditableFalse(caretPosition)) {
				contentEditableFalseNode = caretPosition.getNode();
			}

if (isAfterContentEditableFalse(caretPosition)) {
				contentEditableFalseNode = caretPosition.getNode(true);
			}

if (!caretClientRect) {
				return null;
			}

clientX = caretClientRect.left;

closestNextLineRect = LineUtils.findClosestClientRect(nextLinePositions, clientX);
			if (closestNextLineRect) {
				if (isContentEditableFalse(closestNextLineRect.node)) {
					dist1 = Math.abs(clientX - closestNextLineRect.left);
					dist2 = Math.abs(clientX - closestNextLineRect.right);

return showCaret(direction, closestNextLineRect.node, dist1 < dist2);
				}
			}

if (contentEditableFalseNode) {
				var caretPositions = LineWalker.positionsUntil(direction, rootNode, LineWalker.isAboveLine(1), contentEditableFalseNode);

closestNextLineRect = LineUtils.findClosestClientRect(Arr.filter(caretPositions, LineWalker.isLine(1)), clientX);
				if (closestNextLineRect) {
					return renderRangeCaret(closestNextLineRect.position.toRange());
				}

closestNextLineRect = Arr.last(Arr.filter(caretPositions, LineWalker.isLine(0)));
				if (closestNextLineRect) {
					return renderRangeCaret(closestNextLineRect.position.toRange());
				}
			}
		}

function exitPreBlock(direction, range) {
			var pre, caretPos, newBlock;

function createTextBlock() {
				var textBlock = editor.dom.create(editor.settings.forced_root_block);

if (!Env.ie || Env.ie >= 11) {
					textBlock.innerHTML = ' ';
				}

return textBlock;
			}

if (range.collapsed && editor.settings.forced_root_block) {
				pre = editor.dom.getParent(range.startContainer, 'PRE');
				if (!pre) {
					return;
				}

if (direction == 1) {
					caretPos = getNextVisualCaretPosition(CaretPosition.fromRangeStart(range));
				} else {
					caretPos = getPrevVisualCaretPosition(CaretPosition.fromRangeStart(range));
				}

if (!caretPos) {
					newBlock = createTextBlock();

if (direction == 1) {
						editor.$(pre).after(newBlock);
					} else {
						editor.$(pre).before(newBlock);
					}

editor.selection.select(newBlock, true);
					editor.selection.collapse();
				}
			}
		}

function moveH(direction, getNextPosFn, isBeforeContentEditableFalseFn, range) {
			var newRange;

newRange = moveToCeFalseHorizontally(direction, getNextPosFn, isBeforeContentEditableFalseFn, range);
			if (newRange) {
				return newRange;
			}

newRange = exitPreBlock(direction, range);
			if (newRange) {
				return newRange;
			}

return null;
		}

function moveV(direction, walkerFn, range) {
			var newRange;

newRange = moveToCeFalseVertically(direction, walkerFn, range);
			if (newRange) {
				return newRange;
			}

newRange = exitPreBlock(direction, range);
			if (newRange) {
				return newRange;
			}

return null;
		}

function getBlockCaretContainer() {
			return $('*[data-mce-caret]')[0];
		}

function showBlockCaretContainer(blockCaretContainer) {
			blockCaretContainer = $(blockCaretContainer);

if (blockCaretContainer.attr('data-mce-caret')) {
				fakeCaret.hide();
				blockCaretContainer.removeAttr('data-mce-caret');
				blockCaretContainer.removeAttr('data-mce-bogus');
				blockCaretContainer.removeAttr('style');

// Removes control rect on IE
				setRange(getRange());
				scrollIntoView(blockCaretContainer[0]);
			}
		}

function renderCaretAtRange(range) {
			var caretPosition;

range = CaretUtils.normalizeRange(1, rootNode, range);
			caretPosition = CaretPosition.fromRangeStart(range);

if (isContentEditableFalse(caretPosition.getNode())) {
				return showCaret(1, caretPosition.getNode(), !caretPosition.isAtEnd());
			}

if (isContentEditableFalse(caretPosition.getNode(true))) {
				return showCaret(1, caretPosition.getNode(true), false);
			}

fakeCaret.hide();

return null;
		}

function renderRangeCaret(range) {
			var caretRange;

if (!range || !range.collapsed) {
				return range;
			}

caretRange = renderCaretAtRange(range);
			if (caretRange) {
				return caretRange;
			}

return range;
		}

function deleteContentEditableNode(node) {
			var nextCaretPosition, prevCaretPosition, prevCeFalseElm, nextElement;

if (!isContentEditableFalse(node)) {
				return null;
			}

if (isContentEditableFalse(node.previousSibling)) {
				prevCeFalseElm = node.previousSibling;
			}

prevCaretPosition = getPrevVisualCaretPosition(CaretPosition.before(node));
			if (!prevCaretPosition) {
				nextCaretPosition = getNextVisualCaretPosition(CaretPosition.after(node));
			}

if (nextCaretPosition && isElement(nextCaretPosition.getNode())) {
				nextElement = nextCaretPosition.getNode();
			}

CaretContainer.remove(node.previousSibling);
			CaretContainer.remove(node.nextSibling);
			editor.dom.remove(node);
			clearContentEditableSelection();

if (editor.dom.isEmpty(editor.getBody())) {
				editor.setContent('');
				editor.focus();
				return;
			}

if (prevCeFalseElm) {
				return CaretPosition.after(prevCeFalseElm).toRange();
			}

if (nextElement) {
				return CaretPosition.before(nextElement).toRange();
			}

if (prevCaretPosition) {
				return prevCaretPosition.toRange();
			}

if (nextCaretPosition) {
				return nextCaretPosition.toRange();
			}

return null;
		}

function backspaceDelete(direction, beforeFn, range) {
			var node, caretPosition;

if (!range.collapsed) {
				node = getSelectedNode(range);
				if (isContentEditableFalse(node)) {
					return renderRangeCaret(deleteContentEditableNode(node));
				}
			}

caretPosition = getNormalizedRangeEndPoint(direction, range);

if (beforeFn(caretPosition)) {
				return renderRangeCaret(deleteContentEditableNode(caretPosition.getNode(direction == -1)));
			}
		}

function registerEvents() {
			var right = curry(moveH, 1, getNextVisualCaretPosition, isBeforeContentEditableFalse);
			var left = curry(moveH, -1, getPrevVisualCaretPosition, isAfterContentEditableFalse);
			var deleteForward = curry(backspaceDelete, 1, isBeforeContentEditableFalse);
			var backspace = curry(backspaceDelete, -1, isAfterContentEditableFalse);
			var up = curry(moveV, -1, LineWalker.upUntil);
			var down = curry(moveV, 1, LineWalker.downUntil);

function override(moveFn) {
				var range = moveFn(getRange());

if (range) {
					setRange(range);
					return true;
				}

return false;
			}

function getContentEditableRoot(node) {
				var root = editor.getBody();

while (node && node != root) {
					if (isContentEditableTrue(node) || isContentEditableFalse(node)) {
						return node;
					}

node = node.parentNode;
				}

return null;
			}

// Some browsers (Chrome) lets you place the caret after a cE=false
			// Make sure we render the caret container in this case
			editor.on('mouseup', function() {
				var range = getRange();

if (range.collapsed) {
					setRange(renderCaretAtRange(range));
				}
			});

editor.on('mousedown', function(e) {
				var contentEditableRoot;

contentEditableRoot	= getContentEditableRoot(e.target);
				if (contentEditableRoot) {
					if (isContentEditableFalse(contentEditableRoot)) {
						e.preventDefault();
						setContentEditableSelection(selectNode(contentEditableRoot), false);
					} else {
						editor.selection.placeCaretAt(e.clientX, e.clientY);
					}
				} else {
					clearContentEditableSelection();
					fakeCaret.hide();

var caretInfo = LineUtils.closestCaret(rootNode, e.clientX, e.clientY);
					if (caretInfo) {
						e.preventDefault();
						editor.getBody().focus();
						setRange(showCaret(1, caretInfo.node, caretInfo.before));
					}
				}
			});

editor.on('keydown', function(e) {
				var prevent;

if (VK.modifierPressed(e)) {
					return;
				}

switch (e.keyCode) {
					case VK.RIGHT:
						prevent = override(right);
						break;

case VK.DOWN:
						prevent = override(down);
						break;

case VK.LEFT:
						prevent = override(left);
						break;

case VK.UP:
						prevent = override(up);
						break;

case VK.DELETE:
						prevent = override(deleteForward);
						break;

case VK.BACKSPACE:
						prevent = override(backspace);
						break;

default:
						prevent = isContentEditableFalse(editor.selection.getNode());
						break;
				}

if (prevent) {
					e.preventDefault();
				}
			});

function paddEmptyContentEditableArea() {
				var br, ceRoot = getContentEditableRoot(editor.selection.getNode());

if (isContentEditableTrue(ceRoot) && isBlock(ceRoot) && editor.dom.isEmpty(ceRoot)) {
					br = editor.dom.create('br', {"data-mce-bogus": "1"});
					editor.$(ceRoot).empty().append(br);
					editor.selection.setRng(CaretPosition.before(br).toRange());
				}
			}

function handleBlockContainer(e) {
				var blockCaretContainer = getBlockCaretContainer();

if (!blockCaretContainer) {
					return;
				}

if (e.type == 'compositionstart') {
					e.preventDefault();
					e.stopPropagation();
					showBlockCaretContainer(blockCaretContainer);
					return;
				}

if (blockCaretContainer.innerHTML != '&nbsp;') {
					showBlockCaretContainer(blockCaretContainer);
				}
			}

function handleEmptyBackspaceDelete(e) {
				var prevent;

switch (e.keyCode) {
					case VK.DELETE:
						prevent = paddEmptyContentEditableArea();
						break;

case VK.BACKSPACE:
						prevent = paddEmptyContentEditableArea();
						break;
				}

if (prevent) {
					e.preventDefault();
				}
			}

// Must be added to "top" since undoManager needs to be executed after
			editor.on('keyup compositionstart', function(e) {
				handleBlockContainer(e);
				handleEmptyBackspaceDelete(e);
			}, true);

editor.on('cut', function() {
				var node = editor.selection.getNode();

if (isContentEditableFalse(node)) {
					Delay.setEditorTimeout(editor, function() {
						setRange(renderRangeCaret(deleteContentEditableNode(node)));
					});
				}
			});

editor.on('getSelectionRange', function(e) {
				var rng = e.range;

if (selectedContentEditableNode) {
					if (!selectedContentEditableNode.parentNode) {
						selectedContentEditableNode = null;
						return;
					}

rng = rng.cloneRange();
					rng.selectNode(selectedContentEditableNode);
					e.range = rng;
				}
			});

editor.on('setSelectionRange', function(e) {
				var rng;

rng = setContentEditableSelection(e.range);
				if (rng) {
					e.range = rng;
				}
			});

editor.on('focus', function() {
				// Make sure we have a proper fake caret on focus
				Delay.setEditorTimeout(editor, function() {
					editor.selection.setRng(renderRangeCaret(editor.selection.getRng()));
				});
			});

DragDropOverrides.init(editor);
		}

function addCss() {
			var styles = editor.contentStyles, rootClass = '.mce-content-body';

styles.push(fakeCaret.getCss());
			styles.push(
				rootClass + ' .mce-offscreen-selection {' +
					'position: absolute;' +
					'left: -9999999999px;' +
					'width: 100px' +
					'height: 100px' +
				'}' +
				rootClass + ' *[contentEditable=false] {' +
					'cursor: default;' +
				'}' +
				rootClass + ' *[contentEditable=true] {' +
					'cursor: text;' +
				'}'
			);
		}

function isRangeInCaretContainer(rng) {
			return CaretContainer.isCaretContainer(rng.startContainer) || CaretContainer.isCaretContainer(rng.endContainer);
		}

function setContentEditableSelection(range, fireEvent) {
			var node, $ = editor.$, dom = editor.dom, $realSelectionContainer, sel,
				startContainer, startOffset, endOffset, e, caretPosition;

if (!range) {
				clearContentEditableSelection();
				return null;
			}

if (range.collapsed) {
				clearContentEditableSelection();

if (!isRangeInCaretContainer(range)) {
					caretPosition = getNormalizedRangeEndPoint(1, range);

if (isContentEditableFalse(caretPosition.getNode())) {
						return showCaret(1, caretPosition.getNode(), !caretPosition.isAtEnd());
					}

if (isContentEditableFalse(caretPosition.getNode(true))) {
						return showCaret(1, caretPosition.getNode(true), false);
					}
				}

return null;
			}

startContainer = range.startContainer;
			startOffset = range.startOffset;
			endOffset = range.endOffset;

// Normalizes [] to []
			if (startContainer.nodeType == 3 && startOffset == 0 && isContentEditableFalse(startContainer.parentNode)) {
				startContainer = startContainer.parentNode;
				startOffset = dom.nodeIndex(startContainer);
				startContainer = startContainer.parentNode;
			}

if (startContainer.nodeType != 1) {
				clearContentEditableSelection();
				return null;
			}

if (endOffset == startOffset + 1) {
				node = startContainer.childNodes[startOffset];
			}

if (isContentEditableFalse(node)) {
				if (fireEvent !== false) {
					e = editor.fire('ObjectSelected', {target: node});
					if (e.isDefaultPrevented()) {
						clearContentEditableSelection();
						return null;
					}
				}

$realSelectionContainer = $('#' + realSelectionId);
				if ($realSelectionContainer.length === 0) {
					$realSelectionContainer = $(
						'<div data-mce-bogus="all" class="mce-offscreen-selection"></div>'
					).attr('id', realSelectionId);

$realSelectionContainer.appendTo(editor.getBody());
				}

$realSelectionContainer.empty().append('\u00a0').append(node.cloneNode(true)).append('\u00a0').css({
					top: dom.getPos(node, editor.getBody()).y
				});

range = editor.dom.createRng();
				range.setStart($realSelectionContainer[0].firstChild, 1);
				range.setEnd($realSelectionContainer[0].lastChild, 0);

editor.getBody().focus();
				$realSelectionContainer[0].focus();
				sel = editor.selection.getSel();
				sel.removeAllRanges();
				sel.addRange(range);

editor.$('*[data-mce-selected]').removeAttr('data-mce-selected');
				node.setAttribute('data-mce-selected', 1);
				selectedContentEditableNode = node;

return range;
			}

clearContentEditableSelection();
			return null;
		}

function clearContentEditableSelection() {
			if (selectedContentEditableNode) {
				selectedContentEditableNode.removeAttribute('data-mce-selected');
				editor.$('#' + realSelectionId).remove();
				selectedContentEditableNode = null;
			}
		}

function destroy() {
			fakeCaret.destroy();
			selectedContentEditableNode = null;
		}

if (Env.ceFalse) {
			registerEvents();
			addCss();
		}

return {
			showBlockCaretContainer: showBlockCaretContainer,
			destroy: destroy
		};
	}

return SelectionOverrides;
});

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