Current File : /home/riacommer/public_html/admin/vendor/wysihtml5/src/undo_manager.js
/**
* Undo Manager for wysihtml5
* slightly inspired by http://rniwa.com/editing/undomanager.html#the-undomanager-interface
*/
(function(wysihtml5) {
var Z_KEY = 90,
Y_KEY = 89,
BACKSPACE_KEY = 8,
DELETE_KEY = 46,
MAX_HISTORY_ENTRIES = 40,
UNDO_HTML = '<span id="_wysihtml5-undo" class="_wysihtml5-temp">' + wysihtml5.INVISIBLE_SPACE + '</span>',
REDO_HTML = '<span id="_wysihtml5-redo" class="_wysihtml5-temp">' + wysihtml5.INVISIBLE_SPACE + '</span>',
dom = wysihtml5.dom;
function cleanTempElements(doc) {
var tempElement;
while (tempElement = doc.querySelector("._wysihtml5-temp")) {
tempElement.parentNode.removeChild(tempElement);
}
}
wysihtml5.UndoManager = wysihtml5.lang.Dispatcher.extend(
/** @scope wysihtml5.UndoManager.prototype */ {
constructor: function(editor) {
this.editor = editor;
this.composer = editor.composer;
this.element = this.composer.element;
this.history = [this.composer.getValue()];
this.position = 1;
// Undo manager currently only supported in browsers who have the insertHTML command (not IE)
if (this.composer.commands.support("insertHTML")) {
this._observe();
}
},
_observe: function() {
var that = this,
doc = this.composer.sandbox.getDocument(),
lastKey;
// Catch CTRL+Z and CTRL+Y
dom.observe(this.element, "keydown", function(event) {
if (event.altKey || (!event.ctrlKey && !event.metaKey)) {
return;
}
var keyCode = event.keyCode,
isUndo = keyCode === Z_KEY && !event.shiftKey,
isRedo = (keyCode === Z_KEY && event.shiftKey) || (keyCode === Y_KEY);
if (isUndo) {
that.undo();
event.preventDefault();
} else if (isRedo) {
that.redo();
event.preventDefault();
}
});
// Catch delete and backspace
dom.observe(this.element, "keydown", function(event) {
var keyCode = event.keyCode;
if (keyCode === lastKey) {
return;
}
lastKey = keyCode;
if (keyCode === BACKSPACE_KEY || keyCode === DELETE_KEY) {
that.transact();
}
});
// Now this is very hacky:
// These days browsers don't offer a undo/redo event which we could hook into
// to be notified when the user hits undo/redo in the contextmenu.
// Therefore we simply insert two elements as soon as the contextmenu gets opened.
// The last element being inserted will be immediately be removed again by a exexCommand("undo")
// => When the second element appears in the dom tree then we know the user clicked "redo" in the context menu
// => When the first element disappears from the dom tree then we know the user clicked "undo" in the context menu
if (wysihtml5.browser.hasUndoInContextMenu()) {
var interval, observed, cleanUp = function() {
cleanTempElements(doc);
clearInterval(interval);
};
dom.observe(this.element, "contextmenu", function() {
cleanUp();
that.composer.selection.executeAndRestoreSimple(function() {
if (that.element.lastChild) {
that.composer.selection.setAfter(that.element.lastChild);
}
// enable undo button in context menu
doc.execCommand("insertHTML", false, UNDO_HTML);
// enable redo button in context menu
doc.execCommand("insertHTML", false, REDO_HTML);
doc.execCommand("undo", false, null);
});
interval = setInterval(function() {
if (doc.getElementById("_wysihtml5-redo")) {
cleanUp();
that.redo();
} else if (!doc.getElementById("_wysihtml5-undo")) {
cleanUp();
that.undo();
}
}, 400);
if (!observed) {
observed = true;
dom.observe(document, "mousedown", cleanUp);
dom.observe(doc, ["mousedown", "paste", "cut", "copy"], cleanUp);
}
});
}
this.editor
.observe("newword:composer", function() {
that.transact();
})
.observe("beforecommand:composer", function() {
that.transact();
});
},
transact: function() {
var previousHtml = this.history[this.position - 1],
currentHtml = this.composer.getValue();
if (currentHtml == previousHtml) {
return;
}
var length = this.history.length = this.position;
if (length > MAX_HISTORY_ENTRIES) {
this.history.shift();
this.position--;
}
this.position++;
this.history.push(currentHtml);
},
undo: function() {
this.transact();
if (this.position <= 1) {
return;
}
this.set(this.history[--this.position - 1]);
this.editor.fire("undo:composer");
},
redo: function() {
if (this.position >= this.history.length) {
return;
}
this.set(this.history[++this.position - 1]);
this.editor.fire("redo:composer");
},
set: function(html) {
this.composer.setValue(html);
this.editor.focus(true);
}
});
})(wysihtml5);
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