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(function ($) {
'use strict';
$.sceditor.plugins.undo = function () {
var base = this;
var editor;
var charChangedCount = 0;
var previousValue;
var undoLimit = 50;
var redoStates = [];
var undoStates = [];
var ignoreNextValueChanged = false;
/**
* Sets the editor to the specified state.
*
* @param {Object} state
* @private
*/
var applyState = function (state) {
ignoreNextValueChanged = true;
previousValue = state.value;
editor.sourceMode(state.sourceMode);
editor.val(state.value, false);
editor.focus();
if (state.sourceMode) {
editor.sourceEditorCaret(state.caret);
} else {
editor.getRangeHelper().restoreRange();
}
ignoreNextValueChanged = false;
};
/**
* Caluclates the number of characters that have changed
* between two strings.
*
* @param {String} strA
* @param {String} strB
* @return {String}
* @private
*/
var simpleDiff = function (strA, strB) {
var start, end, aLenDiff, bLenDiff,
aLength = strA.length,
bLength = strB.length,
length = Math.max(aLength, bLength);
// Calculate the start
for (start = 0; start < length; start++) {
if (strA.charAt(start) !== strB.charAt(start)) {
break;
}
}
// Calculate the end
aLenDiff = aLength < bLength ? bLength - aLength : 0;
bLenDiff = bLength < aLength ? aLength - bLength : 0;
for (end = length - 1; end >= 0; end--) {
if (strA.charAt(end - aLenDiff) !==
strB.charAt(end - bLenDiff)) {
break;
}
}
return (end - start) + 1;
};
base.init = function () {
// The this variable will be set to the instance of the editor
// calling it, hence why the plugins "this" is saved to the base
// variable.
editor = this;
undoLimit = editor.undoLimit || undoLimit;
// addShortcut is the easiest way to add handlers to specific
// shortcuts
editor.addShortcut('ctrl+z', base.undo);
editor.addShortcut('ctrl+shift+z', base.redo);
editor.addShortcut('ctrl+y', base.redo);
};
base.undo = function () {
var state = undoStates.pop();
var rawEditorValue = editor.val(null, false);
if (state && !redoStates.length && rawEditorValue === state.value) {
state = undoStates.pop();
}
if (state) {
if (!redoStates.length) {
redoStates.push({
'caret': editor.sourceEditorCaret(),
'sourceMode': editor.sourceMode(),
'value': rawEditorValue
});
}
redoStates.push(state);
applyState(state);
}
return false;
};
base.redo = function () {
var state = redoStates.pop();
if (!undoStates.length) {
undoStates.push(state);
state = redoStates.pop();
}
if (state) {
undoStates.push(state);
applyState(state);
}
return false;
};
base.signalReady = function () {
var rawValue = editor.val(null, false);
// Store the initial value as the last value
previousValue = rawValue;
undoStates.push({
'caret': this.sourceEditorCaret(),
'sourceMode': this.sourceMode(),
'value': rawValue
});
};
/**
* Handle the valueChanged signal.
*
* e.rawValue will either be the raw HTML from the WYSIWYG editor with
* the rangeHelper range markers inserted, or it will be the raw value
* of the source editor (BBCode or HTML depening on plugins).
* @return {void}
*/
base.signalValuechangedEvent = function (e) {
var rawValue = e.rawValue;
if (undoLimit > 0 && undoStates.length > undoLimit) {
undoStates.shift();
}
// If the editor hasn't fully loaded yet,
// then the previous value won't be set.
if (ignoreNextValueChanged || !previousValue ||
previousValue === rawValue) {
return;
}
// Value has changed so remove all redo states
redoStates.length = 0;
charChangedCount += simpleDiff(previousValue, rawValue);
if (charChangedCount < 20) {
return;
// ??
} else if (charChangedCount < 50 && !/\s$/g.test(e.rawValue)) {
return;
}
undoStates.push({
'caret': editor.sourceEditorCaret(),
'sourceMode': editor.sourceMode(),
'value': rawValue
});
charChangedCount = 0;
previousValue = rawValue;
};
};
}(jQuery));
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