/**
* Plugin for Editor to support BiDirectional (bidi) text operations.
* @class Plugin.EditorBidi
* @extends Base
* @constructor
* @module editor
* @submodule editor-bidi
*/
var EditorBidi = function() {
EditorBidi.superclass.constructor.apply(this, arguments);
}, HOST = 'host', DIR = 'dir', NODE_CHANGE = 'nodeChange',
B_C_CHANGE = 'bidiContextChange', STYLE = 'style';
Y.extend(EditorBidi, Y.Base, {
/**
* Place holder for the last direction when checking for a switch
* @private
* @property lastDirection
*/
lastDirection: null,
/**
* Tells us that an initial bidi check has already been performed
* @private
* @property firstEvent
*/
firstEvent: null,
/**
* Method checks to see if the direction of the text has changed based on a nodeChange event.
* @private
* @method _checkForChange
*/
_checkForChange: function() {
var host = this.get(HOST),
inst = host.getInstance(),
sel = new inst.EditorSelection(),
node, direction;
if (sel.isCollapsed) {
node = EditorBidi.blockParent(sel.focusNode, false, inst.EditorSelection.ROOT);
if (node) {
direction = node.getStyle('direction');
if (direction !== this.lastDirection) {
host.fire(B_C_CHANGE, { changedTo: direction });
this.lastDirection = direction;
}
}
} else {
host.fire(B_C_CHANGE, { changedTo: 'select' });
this.lastDirection = null;
}
},
/**
* Checked for a change after a specific nodeChange event has been fired.
* @private
* @method _afterNodeChange
*/
_afterNodeChange: function(e) {
// If this is the first event ever, or an event that can result in a context change
if (this.firstEvent || EditorBidi.EVENTS[e.changedType]) {
this._checkForChange();
this.firstEvent = false;
}
},
/**
* Checks for a direction change after a mouseup occurs.
* @private
* @method _afterMouseUp
*/
_afterMouseUp: function() {
this._checkForChange();
this.firstEvent = false;
},
initializer: function() {
var host = this.get(HOST);
this.firstEvent = true;
host.after(NODE_CHANGE, Y.bind(this._afterNodeChange, this));
host.after('dom:mouseup', Y.bind(this._afterMouseUp, this));
}
}, {
/**
* The events to check for a direction change on
* @property EVENTS
* @static
*/
EVENTS: {
'backspace-up': true,
'pageup-up': true,
'pagedown-down': true,
'end-up': true,
'home-up': true,
'left-up': true,
'up-up': true,
'right-up': true,
'down-up': true,
'delete-up': true
},
/**
* More elements may be needed. BODY *must* be in the list to take care of the special case.
*
* blockParent could be changed to use inst.EditorSelection.BLOCKS
* instead, but that would make Y.Plugin.EditorBidi.blockParent
* unusable in non-RTE contexts (it being usable is a nice
* side-effect).
* @property BLOCKS
* @static
*/
//BLOCKS: Y.EditorSelection.BLOCKS+',LI,HR,' + BODY,
BLOCKS: Y.EditorSelection.BLOCKS,
/**
* Template for creating a block element
* @static
* @property DIV_WRAPPER
*/
DIV_WRAPPER: '<DIV></DIV>',
/**
* Returns a block parent for a given element
* @static
* @method blockParent
*/
blockParent: function(node, wrap, root) {
var parent = node, divNode, firstChild;
root = root || Y.EditorSelection.ROOT;
if (!parent) {
parent = root;
}
if (!parent.test(EditorBidi.BLOCKS)) {
parent = parent.ancestor(EditorBidi.BLOCKS);
}
if (wrap && parent.compareTo(root)) {
// This shouldn't happen if the RTE handles everything
// according to spec: we should get to a P before ROOT. But
// we don't want to set the direction of ROOT even if that
// happens, so we wrap everything in a DIV.
// The code is based on YUI3's Y.EditorSelection._wrapBlock function.
divNode = Y.Node.create(EditorBidi.DIV_WRAPPER);
parent.get('children').each(function(node, index) {
if (index === 0) {
firstChild = node;
} else {
divNode.append(node);
}
});
firstChild.replace(divNode);
divNode.prepend(firstChild);
parent = divNode;
}
return parent;
},
/**
* The data key to store on the node.
* @static
* @property _NODE_SELECTED
*/
_NODE_SELECTED: 'bidiSelected',
/**
* Generates a list of all the block parents of the current NodeList
* @static
* @method addParents
*/
addParents: function(nodeArray, root) {
var i, parent, addParent;
tester = function(sibling) {
if (!sibling.getData(EditorBidi._NODE_SELECTED)) {
addParent = false;
return true; // stop more processing
}
};
root = root || Y.EditorSelection.ROOT;
for (i = 0; i < nodeArray.length; i += 1) {
nodeArray[i].setData(EditorBidi._NODE_SELECTED, true);
}
// This works automagically, since new parents added get processed
// later themselves. So if there's a node early in the process that
// we haven't discovered some of its siblings yet, thus resulting in
// its parent not added, the parent will be added later, since those
// siblings will be added to the array and then get processed.
for (i = 0; i < nodeArray.length; i += 1) {
parent = nodeArray[i].get('parentNode');
// Don't add the parent if the parent is the ROOT element.
// We don't want to change the direction of ROOT. Also don't
// do it if the parent is already in the list.
if (!root.compareTo(parent) && !parent.getData(EditorBidi._NODE_SELECTED)) {
addParent = true;
parent.get('children').some(tester);
if (addParent) {
nodeArray.push(parent);
parent.setData(EditorBidi._NODE_SELECTED, true);
}
}
}
for (i = 0; i < nodeArray.length; i += 1) {
nodeArray[i].clearData(EditorBidi._NODE_SELECTED);
}
return nodeArray;
},
/**
* editorBidi
* @static
* @property NAME
*/
NAME: 'editorBidi',
/**
* editorBidi
* @static
* @property NS
*/
NS: 'editorBidi',
ATTRS: {
host: {
value: false
}
},
/**
* Regex for testing/removing text-align style from an element
* @static
* @property RE_TEXT_ALIGN
*/
RE_TEXT_ALIGN: /text-align:\s*\w*\s*;/,
/**
* Method to test a node's style attribute for text-align and removing it.
* @static
* @method removeTextAlign
*/
removeTextAlign: function(n) {
if (n) {
if (n.getAttribute(STYLE).match(EditorBidi.RE_TEXT_ALIGN)) {
n.setAttribute(STYLE, n.getAttribute(STYLE).replace(EditorBidi.RE_TEXT_ALIGN, ''));
}
if (n.hasAttribute('align')) {
n.removeAttribute('align');
}
}
return n;
}
});
Y.namespace('Plugin');
Y.Plugin.EditorBidi = EditorBidi;
/**
* bidi execCommand override for setting the text direction of a node.
* This property is added to the `Y.Plugin.ExecCommands.COMMANDS`
* collection.
*
* @for Plugin.ExecCommand
* @property bidi
*/
//TODO -- This should not add this command unless the plugin is added to the instance..
Y.Plugin.ExecCommand.COMMANDS.bidi = function(cmd, direction) {
var inst = this.getInstance(),
sel = new inst.EditorSelection(),
ns = this.get(HOST).get(HOST).editorBidi,
returnValue, block, b,
root = inst.EditorSelection.ROOT,
selected, selectedBlocks, dir;
if (!ns) {
Y.error('bidi execCommand is not available without the EditorBiDi plugin.');
return;
}
inst.EditorSelection.filterBlocks();
if (sel.isCollapsed) { // No selection
block = EditorBidi.blockParent(sel.anchorNode, false, root);
if (!block) {
block = root.one(inst.EditorSelection.BLOCKS);
}
//Remove text-align attribute if it exists
block = EditorBidi.removeTextAlign(block);
if (!direction) {
//If no direction is set, auto-detect the proper setting to make it "toggle"
dir = block.getAttribute(DIR);
if (!dir || dir === 'ltr') {
direction = 'rtl';
} else {
direction = 'ltr';
}
}
block.setAttribute(DIR, direction);
if (Y.UA.ie) {
b = block.all('br.yui-cursor');
if (b.size() === 1 && block.get('childNodes').size() === 1) {
b.remove();
}
}
returnValue = block;
} else { // some text is selected
selected = sel.getSelected();
selectedBlocks = [];
selected.each(function(node) {
selectedBlocks.push(EditorBidi.blockParent(node, false, root));
});
selectedBlocks = inst.all(EditorBidi.addParents(selectedBlocks, root));
selectedBlocks.each(function(n) {
var d = direction;
//Remove text-align attribute if it exists
n = EditorBidi.removeTextAlign(n);
if (!d) {
dir = n.getAttribute(DIR);
if (!dir || dir === 'ltr') {
d = 'rtl';
} else {
d = 'ltr';
}
}
n.setAttribute(DIR, d);
});
returnValue = selectedBlocks;
}
ns._checkForChange();
return returnValue;
};
