LineWalker.js
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/**
* LineWalker.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 lets you walk the document line by line
* returing nodes and client rects for each line.
*
* @private
* @class tinymce.caret.LineWalker
*/
define("tinymce/caret/LineWalker", [
"tinymce/util/Fun",
"tinymce/util/Arr",
"tinymce/dom/Dimensions",
"tinymce/caret/CaretCandidate",
"tinymce/caret/CaretUtils",
"tinymce/caret/CaretWalker",
"tinymce/caret/CaretPosition",
"tinymce/geom/ClientRect"
], function(Fun, Arr, Dimensions, CaretCandidate, CaretUtils, CaretWalker, CaretPosition, ClientRect) {
var curry = Fun.curry;
function findUntil(direction, rootNode, predicateFn, node) {
while ((node = CaretUtils.findNode(node, direction, CaretCandidate.isEditableCaretCandidate, rootNode))) {
if (predicateFn(node)) {
return;
}
}
}
function walkUntil(direction, isAboveFn, isBeflowFn, rootNode, predicateFn, caretPosition) {
var line = 0, node, result = [], targetClientRect;
function add(node) {
var i, clientRect, clientRects;
clientRects = Dimensions.getClientRects(node);
if (direction == -1) {
clientRects = clientRects.reverse();
}
for (i = 0; i < clientRects.length; i++) {
clientRect = clientRects[i];
if (isBeflowFn(clientRect, targetClientRect)) {
continue;
}
if (result.length > 0 && isAboveFn(clientRect, Arr.last(result))) {
line++;
}
clientRect.line = line;
if (predicateFn(clientRect)) {
return true;
}
result.push(clientRect);
}
}
targetClientRect = Arr.last(caretPosition.getClientRects());
if (!targetClientRect) {
return result;
}
node = caretPosition.getNode();
add(node);
findUntil(direction, rootNode, add, node);
return result;
}
function aboveLineNumber(lineNumber, clientRect) {
return clientRect.line > lineNumber;
}
function isLine(lineNumber, clientRect) {
return clientRect.line === lineNumber;
}
var upUntil = curry(walkUntil, -1, ClientRect.isAbove, ClientRect.isBelow);
var downUntil = curry(walkUntil, 1, ClientRect.isBelow, ClientRect.isAbove);
function positionsUntil(direction, rootNode, predicateFn, node) {
var caretWalker = new CaretWalker(rootNode), walkFn, isBelowFn, isAboveFn,
caretPosition, result = [], line = 0, clientRect, targetClientRect;
function getClientRect(caretPosition) {
if (direction == 1) {
return Arr.last(caretPosition.getClientRects());
}
return Arr.last(caretPosition.getClientRects());
}
if (direction == 1) {
walkFn = caretWalker.next;
isBelowFn = ClientRect.isBelow;
isAboveFn = ClientRect.isAbove;
caretPosition = CaretPosition.after(node);
} else {
walkFn = caretWalker.prev;
isBelowFn = ClientRect.isAbove;
isAboveFn = ClientRect.isBelow;
caretPosition = CaretPosition.before(node);
}
targetClientRect = getClientRect(caretPosition);
do {
if (!caretPosition.isVisible()) {
continue;
}
clientRect = getClientRect(caretPosition);
if (isAboveFn(clientRect, targetClientRect)) {
continue;
}
if (result.length > 0 && isBelowFn(clientRect, Arr.last(result))) {
line++;
}
clientRect = ClientRect.clone(clientRect);
clientRect.position = caretPosition;
clientRect.line = line;
if (predicateFn(clientRect)) {
return result;
}
result.push(clientRect);
} while ((caretPosition = walkFn(caretPosition)));
return result;
}
return {
upUntil: upUntil,
downUntil: downUntil,
/**
* Find client rects with line and caret position until the predicate returns true.
*
* @method positionsUntil
* @param {Number} direction Direction forward/backward 1/-1.
* @param {DOMNode} rootNode Root node to walk within.
* @param {function} predicateFn Gets the client rect as it's input.
* @param {DOMNode} node Node to start walking from.
* @return {Array} Array of client rects with line and position properties.
*/
positionsUntil: positionsUntil,
isAboveLine: curry(aboveLineNumber),
isLine: curry(isLine)
};
});