egroupware/etemplate/js/et2_core_DOMWidget.js

494 lines
11 KiB
JavaScript

/**
* eGroupWare eTemplate2 - JS DOM Widget class
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Andreas Stöckel
* @copyright Stylite 2011
* @version $Id$
*/
"use strict";
/*egw:uses
et2_core_interfaces;
et2_core_widget;
*/
/**
* Abstract widget class which can be inserted into the DOM. All widget classes
* deriving from this class have to care about implementing the "getDOMNode"
* function which has to return the DOM-Node.
*/
var et2_DOMWidget = et2_widget.extend(et2_IDOMNode, {
attributes: {
"disabled": {
"name": "Visible",
"type": "boolean",
"description": "Defines whether this widget is visible.",
"default": false
},
"width": {
"name": "Width",
"type": "dimension",
"default": et2_no_init,
"description": "Width of the element in pixels, percentage or 'auto'"
},
"height": {
"name": "Height",
"type": "dimension",
"default": et2_no_init,
"description": "Height of the element in pixels, percentage or 'auto'"
},
"class": {
"name": "CSS Class",
"type": "string",
"default": et2_no_init,
"description": "CSS Class which is applied to the dom element of this node"
},
"overflow": {
"name": "Overflow",
"type": "string",
"default": et2_no_init,
"description": "If set, the css-overflow attribute is set to that value"
}
},
/**
* When the DOMWidget is initialized, it grabs the DOM-Node of the parent
* object (if available) and passes it to its own "createDOMNode" function
*/
init: function() {
// Call the inherited constructor
this._super.apply(this, arguments);
this.parentNode = null;
this._attachSet = {
"node": null,
"parent": null
};
this._disabled = false;
this._surroundingsMgr = null;
},
/**
* Detatches the node from the DOM and clears all references to the parent
* node or the dom node of this widget.
*/
destroy: function() {
this.detatchFromDOM();
this.parentNode = null;
this._attachSet = {};
if (this._surroundingsMgr)
{
this._surroundingsMgr.free();
this._surroundingsMgr = null;
}
this._super();
},
/**
* Attaches the container node of this widget to the DOM-Tree
*/
doLoadingFinished: function() {
// Check whether the parent implements the et2_IDOMNode interface. If
// yes, grab the DOM node and create our own.
if (this._parent && this._parent.implements(et2_IDOMNode)) {
this.setParentDOMNode(this._parent.getDOMNode(this));
}
return true;
},
/**
* Detaches the widget from the DOM tree, if it had been attached to the
* DOM-Tree using the attachToDOM method.
*/
detatchFromDOM: function() {
if (this._attachSet.node && this._attachSet.parent)
{
// Remove the current node from the parent node
this._attachSet.parent.removeChild(this._attachSet.node);
// Reset the "attachSet"
this._attachSet = {
"node": null,
"parent": null
};
return true;
}
return false;
},
/**
* Attaches the widget to the DOM tree. Fails if the widget is already
* attached to the tree or no parent node or no node for this widget is
* defined.
*/
attachToDOM: function() {
// Attach the DOM node of this widget (if existing) to the new parent
var node = this.getDOMNode(this);
if (node && this.parentNode &&
(node != this._attachSet.node ||
this.parentNode != this._attachSet.parent))
{
// If the surroundings manager exists, surround the DOM-Node of this
// widget with the DOM-Nodes inside the surroundings manager.
if (this._surroundingsMgr)
{
node = this._surroundingsMgr.getDOMNode(node);
}
this.parentNode.appendChild(node);
// Store the currently attached nodes
this._attachSet = {
"node": node,
"parent": this.parentNode
};
return true;
}
return false;
},
isAttached: function() {
return this.parentNode != null;
},
getSurroundings: function() {
if (!this._surroundingsMgr)
{
this._surroundingsMgr = new et2_surroundingsMgr(this);
}
return this._surroundingsMgr;
},
/**
* Set the parent DOM node of this element. If another parent node is already
* set, this widget removes itself from the DOM tree
*/
setParentDOMNode: function(_node) {
if (_node != this.parentNode)
{
// Detatch this element from the DOM tree
this.detatchFromDOM();
this.parentNode = _node;
// And attatch the element to the DOM tree
this.attachToDOM();
}
},
/**
* Returns the parent node.
*/
getParentDOMNode: function() {
return this.parentNode;
},
/**
* Sets the id of the DOM-Node.
*/
set_id: function(_value) {
this.id = _value;
var node = this.getDOMNode(this);
if (node)
{
if (_value != "")
{
node.setAttribute("id", _value);
}
else
{
node.removeAttribute("id");
}
}
},
set_disabled: function(_value) {
var node = this.getDOMNode(this);
if (node)
{
this.disabled = _value;
if (_value)
{
$j(node).hide();
}
else
{
$j(node).show();
}
}
},
set_width: function(_value) {
this.width = _value;
var node = this.getDOMNode(this);
if (node)
{
$j(node).css("width", _value);
}
},
set_height: function(_value) {
this.height = _value;
var node = this.getDOMNode(this);
if (node)
{
$j(node).css("height", _value);
}
},
set_class: function(_value) {
var node = this.getDOMNode(this);
if (node)
{
if (this["class"])
{
$j(node).removeClass(this["class"]);
}
$j(node).addClass(_value);
}
this["class"] = _value;
},
set_overflow: function(_value) {
this.overflow = _value;
var node = this.getDOMNode(this);
if (node)
{
$j(node).css("overflow", _value);
}
}
});
/**
* The surroundings manager class allows to append or prepend elements around
* an widget node.
*/
var et2_surroundingsMgr = Class.extend({
init: function(_widget) {
this.widget = _widget;
this._widgetContainer = null;
this._widgetSurroundings = [];
this._widgetPlaceholder = null;
this._widgetNode = null;
this._ownPlaceholder = true;
},
destroy: function() {
this._widgetContainer = null;
this._widgetSurroundings = null;
this._widgetPlaceholder = null;
this._widgetNode = null;
},
prependDOMNode: function(_node) {
this._widgetSurroundings.unshift(_node);
this._surroundingsUpdated = true;
},
appendDOMNode: function(_node) {
// Append an placeholder first if none is existing yet
if (this._ownPlaceholder && this._widgetPlaceholder == null)
{
this._widgetPlaceholder = document.createElement("span");
this._widgetSurroundings.push(this._widgetPlaceholder);
}
// Append the given node
this._widgetSurroundings.push(_node);
this._surroundingsUpdated = true;
},
insertDOMNode: function(_node) {
if (!this._ownPlaceholder || this._widgetPlaceholder == null)
{
this.appendDOMNode(_node);
return;
}
// Get the index of the widget placeholder and delete it, insert the
// given node instead
var idx = this._widgetSurroundings.indexOf(this._widgetPlaceholder);
this._widgetSurroundings.splice(idx, 1, _node);
// Delete the reference to the own placeholder
this._widgetPlaceholder = null;
this._ownPlaceholder = false;
},
removeDOMNode: function(_node) {
for (var i = 0; i < this._widgetSurroundings.length; i++)
{
if (this._widgetSurroundings[i] == _node)
{
this._widgetSurroundings.splice(i, 1);
this._surroundingsUpdated = true;
break;
}
}
},
setWidgetPlaceholder: function(_node) {
if (_node != this._widgetPlaceholder)
{
if (_node != null && this._ownPlaceholder && this._widgetPlaceholder != null)
{
// Delete the current placeholder which was created by the
// widget itself
var idx = this._widgetSurroundings.indexOf(this._widgetPlaceholder);
this._widgetSurroundings.splice(idx, 1);
// Delete any reference to the own placeholder and set the
// _ownPlaceholder flag to false
this._widgetPlaceholder = null;
this._ownPlaceholder = false;
}
this._ownPlaceholder = (_node == null);
this._widgetPlaceholder = _node;
this._surroundingsUpdated = true;
}
},
_rebuildContainer: function() {
// Return if there has been no change in the "surroundings-data"
if (!this._surroundingsUpdated)
{
return false;
}
// Build the widget container
if (this._widgetSurroundings.length > 0)
{
// Check whether the widgetPlaceholder is really inside the DOM-Tree
var hasPlaceholder = et2_hasChild(this._widgetSurroundings,
this._widgetPlaceholder);
// If not, append another widget placeholder
if (!hasPlaceholder)
{
this._widgetPlaceholder = document.createElement("span");
this._widgetSurroundings.push(this._widgetPlaceholder);
this._ownPlaceholder = true;
}
// If the surroundings array only contains one element, set this one
// as the widget container
if (this._widgetSurroundings.length == 1)
{
if (this._widgetSurroundings[0] == this._widgetPlaceholder)
{
this._widgetContainer = null;
}
else
{
this._widgetContainer = this._widgetSurroundings[0];
}
}
else
{
// Create an outer "span" as widgetContainer
this._widgetContainer = document.createElement("span");
// Append the children inside the widgetSurroundings array to
// the widget container
for (var i = 0; i < this._widgetSurroundings.length; i++)
{
this._widgetContainer.appendChild(this._widgetSurroundings[i]);
}
}
}
else
{
this._widgetContainer = null;
this._widgetPlaceholder = null;
}
this._surroundingsUpdated = false;
return true;
},
update: function() {
if (this._surroundingsUpdated)
{
var attached = this.widget ? this.widget.isAttached() : false;
// Reattach the widget - this will call the "getDOMNode" function
// and trigger the _rebuildContainer function.
if (attached && this.widget)
{
this.widget.detatchFromDOM();
this.widget.attachToDOM();
}
}
},
getDOMNode: function(_widgetNode) {
// Update the whole widgetContainer if this is not the first time this
// function has been called but the widget node has changed.
if (this._widgetNode != null && this._widgetNode != _widgetNode)
{
this._surroundingsUpdated = true;
}
// Copy a reference to the given node
this._widgetNode = _widgetNode;
// Build the container if it didn't exist yet.
var updated = this._rebuildContainer(true);
// Return the widget node itself if there are no surroundings arround
// it
if (this._widgetContainer == null)
{
return _widgetNode;
}
// Replace the widgetPlaceholder with the given widget node if the
// widgetContainer has been updated
if (updated)
{
this._widgetPlaceholder.parentNode.replaceChild(_widgetNode,
this._widgetPlaceholder);
if (!this._ownPlaceholder)
{
this._widgetPlaceholder = _widgetNode;
}
}
// Return the widget container
return this._widgetContainer;
}
});