CaretUtils.js
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/**
* CaretUtils.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
*/
/**
* Utility functions shared by the caret logic.
*
* @private
* @class tinymce.caret.CaretUtils
*/
define("tinymce/caret/CaretUtils", [
"tinymce/util/Fun",
"tinymce/dom/TreeWalker",
"tinymce/dom/NodeType",
"tinymce/caret/CaretPosition",
"tinymce/caret/CaretContainer",
"tinymce/caret/CaretCandidate"
], function(Fun, TreeWalker, NodeType, CaretPosition, CaretContainer, CaretCandidate) {
var isContentEditableTrue = NodeType.isContentEditableTrue,
isContentEditableFalse = NodeType.isContentEditableFalse,
isBlockLike = NodeType.matchStyleValues('display', 'block table table-cell table-caption'),
isCaretContainer = CaretContainer.isCaretContainer,
curry = Fun.curry,
isElement = NodeType.isElement,
isCaretCandidate = CaretCandidate.isCaretCandidate;
function isForwards(direction) {
return direction > 0;
}
function isBackwards(direction) {
return direction < 0;
}
function findNode(node, direction, predicateFn, rootNode, shallow) {
var walker = new TreeWalker(node, rootNode);
if (isBackwards(direction)) {
if (isContentEditableFalse(node)) {
node = walker.prev(true);
if (predicateFn(node)) {
return node;
}
}
while ((node = walker.prev(shallow))) {
if (predicateFn(node)) {
return node;
}
}
}
if (isForwards(direction)) {
if (isContentEditableFalse(node)) {
node = walker.next(true);
if (predicateFn(node)) {
return node;
}
}
while ((node = walker.next(shallow))) {
if (predicateFn(node)) {
return node;
}
}
}
return null;
}
function getEditingHost(node, rootNode) {
for (node = node.parentNode; node && node != rootNode; node = node.parentNode) {
if (isContentEditableTrue(node)) {
return node;
}
}
return rootNode;
}
function getParentBlock(node, rootNode) {
while (node && node != rootNode) {
if (isBlockLike(node)) {
return node;
}
node = node.parentNode;
}
return null;
}
function isInSameBlock(caretPosition1, caretPosition2, rootNode) {
return getParentBlock(caretPosition1.container(), rootNode) == getParentBlock(caretPosition2.container(), rootNode);
}
function isInSameEditingHost(caretPosition1, caretPosition2, rootNode) {
return getEditingHost(caretPosition1.container(), rootNode) == getEditingHost(caretPosition2.container(), rootNode);
}
function getChildNodeAtRelativeOffset(relativeOffset, caretPosition) {
var container, offset;
if (!caretPosition) {
return null;
}
container = caretPosition.container();
offset = caretPosition.offset();
if (!isElement(container)) {
return null;
}
return container.childNodes[offset + relativeOffset];
}
function beforeAfter(before, node) {
var range = node.ownerDocument.createRange();
if (before) {
range.setStartBefore(node);
range.setEndBefore(node);
} else {
range.setStartAfter(node);
range.setEndAfter(node);
}
return range;
}
function isNodesInSameBlock(rootNode, node1, node2) {
return getParentBlock(node1, rootNode) == getParentBlock(node2, rootNode);
}
function lean(left, rootNode, node) {
var sibling, siblingName;
if (left) {
siblingName = 'previousSibling';
} else {
siblingName = 'nextSibling';
}
while (node && node != rootNode) {
sibling = node[siblingName];
if (isCaretContainer(sibling)) {
sibling = sibling[siblingName];
}
if (isContentEditableFalse(sibling)) {
if (isNodesInSameBlock(rootNode, sibling, node)) {
return sibling;
}
break;
}
if (isCaretCandidate(sibling)) {
break;
}
node = node.parentNode;
}
return null;
}
var before = curry(beforeAfter, true);
var after = curry(beforeAfter, false);
function normalizeRange(direction, rootNode, range) {
var node, container, offset, location;
var leanLeft = curry(lean, true, rootNode);
var leanRight = curry(lean, false, rootNode);
container = range.startContainer;
offset = range.startOffset;
if (CaretContainer.isCaretContainerBlock(container)) {
if (!isElement(container)) {
container = container.parentNode;
}
location = container.getAttribute('data-mce-caret');
if (location == 'before') {
node = container.nextSibling;
if (isContentEditableFalse(node)) {
return before(node);
}
}
if (location == 'after') {
node = container.previousSibling;
if (isContentEditableFalse(node)) {
return after(node);
}
}
}
if (!range.collapsed) {
return range;
}
if (NodeType.isText(container)) {
if (isCaretContainer(container)) {
if (direction === 1) {
node = leanRight(container);
if (node) {
return before(node);
}
node = leanLeft(container);
if (node) {
return after(node);
}
}
if (direction === -1) {
node = leanLeft(container);
if (node) {
return after(node);
}
node = leanRight(container);
if (node) {
return before(node);
}
}
return range;
}
if (CaretContainer.endsWithCaretContainer(container) && offset >= container.data.length - 1) {
if (direction === 1) {
node = leanRight(container);
if (node) {
return before(node);
}
}
return range;
}
if (CaretContainer.startsWithCaretContainer(container) && offset <= 1) {
if (direction === -1) {
node = leanLeft(container);
if (node) {
return after(node);
}
}
return range;
}
if (offset === container.data.length) {
node = leanRight(container);
if (node) {
return before(node);
}
return range;
}
if (offset === 0) {
node = leanLeft(container);
if (node) {
return after(node);
}
return range;
}
}
return range;
}
function isNextToContentEditableFalse(relativeOffset, caretPosition) {
return isContentEditableFalse(getChildNodeAtRelativeOffset(relativeOffset, caretPosition));
}
return {
isForwards: isForwards,
isBackwards: isBackwards,
findNode: findNode,
getEditingHost: getEditingHost,
getParentBlock: getParentBlock,
isInSameBlock: isInSameBlock,
isInSameEditingHost: isInSameEditingHost,
isBeforeContentEditableFalse: curry(isNextToContentEditableFalse, 0),
isAfterContentEditableFalse: curry(isNextToContentEditableFalse, -1),
normalizeRange: normalizeRange
};
});