forked from extern/egroupware
578 lines
13 KiB
JavaScript
578 lines
13 KiB
JavaScript
/**
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* eGroupWare eTemplate2 - JS Widget base class
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*
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package etemplate
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* @subpackage api
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* @link http://www.egroupware.org
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* @author Andreas Stöckel
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* @copyright Stylite 2011
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* @version $Id$
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*/
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"use strict";
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/*egw:uses
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et2_xml;
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et2_common;
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et2_inheritance;
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et2_contentArrayMgr;
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*/
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/**
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* The registry contains all XML tag names and the corresponding widget
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* constructor.
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*/
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var et2_registry = {};
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/**
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* Registers the widget class defined by the given constructor and associates it
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* with the types in the _types array.
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*/
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function et2_register_widget(_constructor, _types)
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{
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// Iterate over all given types and register those
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for (var i = 0; i < _types.length; i++)
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{
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var type = _types[i].toLowerCase();
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// Check whether a widget has already been registered for one of the
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// types.
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if (et2_registry[type])
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{
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et2_debug("warn", "Widget class registered for " + type +
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" will be overwritten.");
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}
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et2_registry[type] = _constructor;
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}
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}
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/**
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* The et2 widget base class.
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*/
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var et2_widget = Class.extend({
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attributes: {
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"id": {
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"name": "ID",
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"type": "string",
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"description": "Unique identifier of the widget"
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},
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/**
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* Ignore the "span" property by default - it is read by the grid and
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* other widgets.
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*/
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"span": {
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"ignore": true
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},
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/**
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* Ignore the "type" tag - it is read by the "createElementFromNode"
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* function and passed as second parameter of the widget constructor
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*/
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"type": {
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"ignore": true
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}
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},
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// Set the legacyOptions array to the names of the properties the "options"
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// attribute defines.
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legacyOptions: [],
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/**
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* The init function is the constructor of the widget. When deriving new
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* classes from the widget base class, always call this constructor unless
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* you know what you're doing.
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*
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* @param _parent is the parent object from the XML tree which contains this
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* object. The default constructor always adds the new instance to the
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* children list of the given parent object. _parent may be NULL.
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* @param _type is the node name with which the widget has been created. This
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* is usefull if a single widget class implements multiple XET-Node widgets.
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*/
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init: function(_parent, _type) {
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if (typeof _type == "undefined")
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{
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_type = "widget";
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}
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this.id = "";
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this._mgr = null;
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// Copy the parent parameter and add this widget to its parent children
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// list.
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this._parent = _parent;
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this.onSetParent();
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if (_parent != null)
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{
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this._parent.addChild(this);
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}
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this._children = [];
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this.type = _type;
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// The supported widget classes array defines a whitelist for all widget
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// classes or interfaces child widgets have to support.
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this.supportedWidgetClasses = [et2_widget];
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},
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/**
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* The destroy function destroys all children of the widget, removes itself
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* from the parents children list.
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* In all classes derrived from et2_widget ALWAYS override the destroy
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* function and remove ALL references to other objects. Also remember to
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* unbind ANY event this widget created and to remove all DOM-Nodes it
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* created.
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*/
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destroy: function() {
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// Call the destructor of all children
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for (var i = this._children.length - 1; i >= 0; i--)
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{
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this._children[i].destroy();
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}
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// Remove this element from the parent
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if (this._parent !== null)
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{
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this._parent.removeChild(this);
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}
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// Delete all references to other objects
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this._children = [];
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this._parent = null;
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this._mgr = null;
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this.onSetParent();
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},
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/**
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* Creates a copy of this widget. The parameters given are passed to the
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* constructor of the copied object. If the parameters are omitted, _parent
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* is defaulted to null
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*/
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clone: function(_parent, _type) {
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// Default _parent to null
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if (typeof _parent == "undefined")
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{
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_parent = null;
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}
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// Create the copy
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var copy = new (this.constructor)(_parent, _type);
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// Assign this element to the copy
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copy.assign(this);
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return copy;
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},
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assign: function(_obj) {
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// Create a clone of all child elements of the given object
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for (var i = 0; i < _obj._children.length; i++)
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{
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_obj._children[i].clone(this, _obj._children[i].type);
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}
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// Copy all properties
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for (var key in _obj.attributes)
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{
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if (!_obj.attributes[key].ignore)
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{
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this.setAttribute(key, _obj.getAttribute(key));
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}
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}
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// Copy a reference to the content array manager
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if (_obj._mgr)
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{
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this._mgr = _obj._mgr;
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}
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},
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/**
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* Returns the parent widget of this widget
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*/
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getParent: function() {
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return this._parent;
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},
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/**
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* The set parent event is called, whenever the parent of the widget is set.
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* Child classes can overwrite this function. Whe onSetParent is called,
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* the change of the parent has already taken place.
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*/
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onSetParent: function() {
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},
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/**
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* Returns the list of children of this widget.
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*/
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getChildren: function() {
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return this._children;
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},
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/**
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* Returns the base widget
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*/
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getRoot: function() {
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if (this._parent != null)
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{
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return this._parent.getRoot();
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}
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else
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{
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return this;
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}
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},
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/**
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* Inserts an child at the end of the list.
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*
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* @param _node is the node which should be added. It has to be an instance
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* of et2_widget
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*/
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addChild: function(_node) {
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this.insertChild(_node, this._children.length);
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},
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/**
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* Inserts a child at the given index.
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*
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* @param _node is the node which should be added. It has to be an instance
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* of et2_widget
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* @param _idx is the position at which the element should be added.
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*/
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insertChild: function(_node, _idx) {
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// Check whether the node is one of the supported widget classes.
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if (this.isOfSupportedWidgetClass(_node))
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{
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_node.parent = this;
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this._children.splice(_idx, 0, _node);
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}
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else
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{
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throw("_node is not supported by this widget class!");
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}
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},
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/**
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* Removes the child but does not destroy it.
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*/
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removeChild: function(_node) {
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// Retrieve the child from the child list
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var idx = this._children.indexOf(_node);
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if (idx >= 0)
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{
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// This element is no longer parent of the child
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_node._parent = null;
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_node.onSetParent();
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this._children.splice(idx, 1);
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}
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},
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/**
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* Searches an element by id in the tree, descending into the child levels.
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*
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* @param _id is the id you're searching for
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*/
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getWidgetById: function(_id) {
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if (this.id == _id)
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{
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return this;
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}
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for (var i = 0; i < this._children.length; i++)
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{
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var elem = this._children[i].getWidgetById(_id);
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if (elem != null)
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{
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return elem;
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}
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}
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return null;
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},
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/**
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* Function which allows iterating over the complete widget tree.
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*
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* @param _callback is the function which should be called for each widget
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* @param _context is the context in which the function should be executed
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* @param _type is an optional parameter which specifies a class/interface
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* the elements have to be instanceOf.
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*/
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iterateOver: function(_callback, _context, _type) {
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if (typeof _type == "undefined")
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{
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_type = et2_widget;
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}
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if (this.instanceOf(_type))
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{
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_callback.call(_context, this);
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}
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for (var i = 0; i < this._children.length; i++)
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{
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this._children[i].iterateOver(_callback, _context, _type);
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}
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},
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isOfSupportedWidgetClass: function(_obj)
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{
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for (var i = 0; i < this.supportedWidgetClasses.length; i++)
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{
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if (_obj.instanceOf(this.supportedWidgetClasses[i]))
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{
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return true;
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}
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}
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return false;
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},
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createElementFromNode: function(_node, _nodeName) {
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// Check whether the type attribute exists - if yes pass it instead of
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// the nodeName
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if (_node.getAttribute("type"))
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{
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_nodeName = _node.getAttribute("type");
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}
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if (typeof _nodeName == "undefined")
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{
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_nodeName = _node.nodeName.toLowerCase();
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}
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// Check whether a widget with the given type is registered.
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var constructor = typeof et2_registry[_nodeName] == "undefined" ?
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et2_placeholder : et2_registry[_nodeName];
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// Creates the new widget, passes this widget as an instance and
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// passes the widgetType. Then it goes on loading the XML for it.
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var widget = new constructor(this, _nodeName)
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widget.loadFromXML(_node);
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return widget;
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},
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/**
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* Loads the widget tree from an XML node
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*/
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loadFromXML: function(_node) {
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// Try to load the attributes of the current node
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if (_node.attributes)
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{
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this.loadAttributes(_node.attributes);
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}
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// Load the child nodes.
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for (var i = 0; i < _node.childNodes.length; i++)
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{
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var node = _node.childNodes[i];
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var widgetType = node.nodeName.toLowerCase();
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if (widgetType == "#comment")
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{
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continue;
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}
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if (widgetType == "#text")
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{
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if (node.data.replace(/^\s+|\s+$/g, ''))
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{
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this.loadContent(node.data);
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}
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continue;
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}
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// Create the new element
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this.createElementFromNode(node, widgetType);
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}
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},
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/**
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* Loads the widget attributes from the passed DOM attributes array.
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*/
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loadAttributes: function(_attrs) {
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for (var i = 0; i < _attrs.length; i++)
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{
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// Special handling for the legacy options
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if (_attrs[i].name == "options")
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{
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// Parse the legacy options
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var splitted = et2_csvSplit(_attrs[i].value);
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for (var i = 0; i < splitted.length && i < this.legacyOptions.length; i++)
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{
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this.setAttribute(this.legacyOptions[i], splitted[i]);
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}
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}
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else
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{
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var attrName = _attrs[i].name;
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var attrValue = _attrs[i].value;
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if (typeof this.attributes[attrName] != "undefined")
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{
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var attr = this.attributes[attrName];
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// If the attribute is marked as boolean, parse the
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// expression as bool expression.
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if (attr.type == "boolean")
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{
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attrValue = this.getContentMgr()
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.parseBoolExpression(attrValue);
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}
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else
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{
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attrValue = this.getContentMgr().expandName(attrValue);
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}
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}
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// Set the attribute
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this.setAttribute(attrName, attrValue);
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}
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}
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},
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/**
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* Called whenever textNodes are loaded from the XML tree
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*/
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loadContent: function(_content) {
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},
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/**
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* Calls the setter of each property with its current value, calls the
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* update function of all child nodes.
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*/
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update: function() {
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// Go through every property of this object and check whether a
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// corresponding setter function exists. If yes, it is called.
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for (var key in this.attributes)
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{
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if (!this.attributes[key].ignore)
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{
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this.setAttribute(key, this.getAttribute(key));
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}
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}
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// Call the update function of all children.
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for (var i = 0; i < this._children.length; i++)
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{
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this._children[i].update();
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}
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},
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setContentMgr: function(_mgr) {
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this._mgr = _mgr;
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},
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getContentMgr: function() {
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if (this._mgr != null)
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{
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return this._mgr;
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}
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else if (this._parent)
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{
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return this._parent.getContentMgr();
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}
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return null;
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},
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/**
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* Fetches all input element values and returns them in an associative
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* array. Widgets which introduce namespacing can use the internal _target
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* parameter to add another layer.
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*/
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getValues: function() {
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var result = {};
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// Iterate over the widget tree
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this.iterateOver(function(_widget) {
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// Get the path to the node we have to store the value at
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var path = _widget.getContentMgr().getPath();
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// Set the _target variable to that node
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var _target = result;
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for (var i = 0; i < path.length; i++)
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{
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// Create a new object for not-existing path nodes
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if (typeof _target[path[i]] == "undefined")
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{
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_target[path[i]] = {};
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}
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// Check whether the path node is really an object
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if (_target[path[i]] instanceof Object)
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{
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_target = _target[path[i]];
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}
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else
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{
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et2_debug("error", "ID collision while writing at path " +
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"node '" + path[i] + "'");
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}
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}
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// Check whether the entry is really undefined
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if (typeof _target[_widget.id] != "undefined")
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{
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et2_debug("error", "Overwriting value of '" + this.id +
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"', id exists twice!");
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}
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// Store the value of the widget and reset its dirty flag,
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_target[_widget.id] = _widget.getValue();
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_widget.resetDirty();
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}, this, et2_IInput);
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return result;
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},
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/**
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* Checks whether a namespace exists for this element in the content array.
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* If yes, an own perspective of the content array is created. If not, the
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* parent content manager is used.
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*/
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checkCreateNamespace: function() {
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// Get the content manager
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var mgr = this.getContentMgr();
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// Get the original content manager if we have already created a
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// perspective for this node
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if (this._mgr != null && this._mgr.perspectiveData.owner == this)
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{
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mgr = mgr.parentMgr;
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}
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// Check whether the manager has a namespace for the id of this object
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if (mgr.getEntry(this.id) instanceof Object)
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{
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// The content manager has a own node for this object, so create
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// an own perspective.
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this._mgr = mgr.openPerspective(this, this.id);
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}
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else
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{
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// The current content manager does not have an own namespace for
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// this element, so use the content manager of the parent.
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this._mgr = null;
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}
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}
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});
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