mirror of
https://github.com/EGroupware/egroupware.git
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378 lines
8.8 KiB
JavaScript
378 lines
8.8 KiB
JavaScript
/**
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* EGroupware eTemplate2 - dataview code
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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 dataview
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* @link http://www.egroupware.org
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* @author Andreas Stöckel
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* @copyright Stylite 2012
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* @version $Id$
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*/
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/*egw:uses
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jquery.jquery;
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et2_dataview_interfaces;
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*/
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/**
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* The et2_dataview_container class is the main object each dataview consits of.
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* Each row, spacer as well as the grid itself are containers. A container is
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* described by its parent element and a certain height. On the DOM-Level a
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* container may consist of multiple "tr" nodes, which are treated as a unit.
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* Some containers (like grid containers) are capable of managing a set of child
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* containers. Each container can indicate, that it thinks that it's height
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* might have changed. In that case it informs its parent element about that.
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* The only requirement for the parent element is, that it implements the
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* et2_dataview_IInvalidatable interface.
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* A container does not know where it resides inside the grid, or whether it is
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* currently visible or not -- this information is efficiently managed by the
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* et2_dataview_grid container.
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*
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* @augments Class
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*/
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var et2_dataview_container = (function(){ "use strict"; return Class.extend(et2_dataview_IInvalidatable,
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{
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/**
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* Initializes the container object.
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*
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* @param _parent is an object which implements the IInvalidatable
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* interface. _parent may not be null.
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* @memberOf et2_dataview_container
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*/
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init: function(_parent) {
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// Copy the given invalidation element
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this._parent = _parent;
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this._nodes = []; // contains all DOM-Nodes this container exists of
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this._inTree = false; //
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this._attachData = {"node": null, "prepend": false};
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this._destroyCallback = null;
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this._destroyContext = null;
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this._height = false;
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this._index = 0;
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this._top = 0;
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},
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/**
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* Destroys this container. Classes deriving from et2_dataview_container
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* should override this method and take care of unregistering all event
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* handlers etc.
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*/
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destroy: function() {
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// Remove the nodes from the tree
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this.removeFromTree();
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// Call the callback function (if one is registered)
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if (this._destroyCallback)
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{
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this._destroyCallback.call(this._destroyContext, this);
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}
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},
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/**
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* Sets the "destroyCallback" -- the given function gets called whenever
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* the container is destroyed. This instance is passed as an parameter to
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* the callback.
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*
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* @param {function} _callback
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* @param {object} _context
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*/
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setDestroyCallback: function(_callback, _context) {
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this._destroyCallback = _callback;
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this._destroyContext = _context;
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},
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/**
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* Inserts all container nodes into the DOM tree after or before the given
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* element.
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*
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* @param _node is the node after/before which the container "tr"s should
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* get inserted. _node should be a simple DOM node, not a jQuery object.
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* @param _prepend specifies whether the container should be inserted before
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* or after the given node. Inserting before is needed for inserting the
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* first element in front of an spacer.
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*/
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insertIntoTree: function(_node, _prepend) {
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if (!this._inTree && _node != null && this._nodes.length > 0)
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{
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// Store the parent node and indicate that this element is now in
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// the tree.
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this._attachData = {"node": _node, "prepend": _prepend};
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this._inTree = true;
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for (var i = 0; i < this._nodes.length; i++)
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{
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if (i == 0)
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{
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if (_prepend)
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{
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_node.before(this._nodes[0]);
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}
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else
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{
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_node.after(this._nodes[0]);
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}
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}
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else
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{
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// Insert all following nodes after the previous node
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this._nodes[i - 1].after(this._nodes[i]);
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}
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}
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// Invalidate this element in order to update the height of the
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// parent
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this.invalidate();
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}
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},
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/**
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* Removes all container nodes from the tree.
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*/
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removeFromTree: function() {
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if (this._inTree)
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{
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// Call the jQuery remove function to remove all nodes from the tree
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// again.
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for (var i = 0; i < this._nodes.length; i++)
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{
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this._nodes[i].remove();
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}
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// Reset the "attachData"
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this._inTree = false;
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this._attachData = {"node": null, "prepend": false};
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}
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},
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/**
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* Appends a node to the container.
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*
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* @param _node is the DOM-Node which should be appended.
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*/
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appendNode: function(_node) {
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// Add the given node to the "nodes" array
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this._nodes.push(_node);
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// If the container is already in the tree, attach the given node to the
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// tree.
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if (this._inTree)
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{
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if (this._nodes.length === 1)
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{
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if (this._attachData.prepend)
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{
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this._attachData.node.before(_node);
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}
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else
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{
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this._attachData.node.after(_node);
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}
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}
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else
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{
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this._nodes[this._nodes.length - 2].after(_node);
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}
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this.invalidate();
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}
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},
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/**
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* Removes a certain node from the container
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*
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* @param {DOMElement} _node
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*/
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removeNode: function(_node) {
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// Get the index of the node in the nodes array
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var idx = this._nodes.indexOf(_node);
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if (idx >= 0)
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{
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// Remove the node if the container is currently attached
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if (this._inTree)
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{
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_node.parentNode.removeChild(_node);
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}
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// Remove the node from the nodes array
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this._nodes.splice(idx, 1);
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}
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},
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/**
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* Returns the last node of the container - new nodes have to be appended
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* after it.
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*/
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getLastNode: function() {
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if (this._nodes.length > 0)
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{
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return this._nodes[this._nodes.length - 1];
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}
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return null;
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},
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/**
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* Returns the first node of the container.
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*/
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getFirstNode: function() {
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return this._nodes.length > 0 ? this._nodes[0] : null;
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},
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/**
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* Returns the accumulated height of all container nodes. Only visible nodes
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* (without "display: none" etc.) are taken into account.
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*/
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getHeight: function() {
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if (this._height === false && this._inTree)
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{
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this._height = 0;
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// Increment the height value for each visible container node
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for (var i = 0; i < this._nodes.length; i++)
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{
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if (this._isVisible(this._nodes[i][0]))
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{
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this._height += this._nodeHeight(this._nodes[i][0]);
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}
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}
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}
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return this._height === false ? 0 : this._height;
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},
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/**
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* Returns a datastructure containing information used for calculating the
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* average row height of a grid.
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* The datastructure has the
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* {
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* avgHeight: <the calculated average height of this element>,
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* avgCount: <the element count this calculation was based on>
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* }
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*/
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getAvgHeightData: function() {
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return {
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"avgHeight": this.getHeight(),
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"avgCount": 1
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};
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},
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/**
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* Returns the previously set "pixel top" of the container.
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*/
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getTop: function() {
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return this._top;
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},
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/**
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* Returns the "pixel bottom" of the container.
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*/
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getBottom: function() {
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return this._top + this.getHeight();
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},
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/**
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* Returns the range of the element.
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*/
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getRange: function() {
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return et2_bounds(this.getTop(), this.getBottom());
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},
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/**
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* Returns the index of the element.
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*/
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getIndex: function() {
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return this._index;
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},
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/**
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* Returns how many elements this container represents.
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*/
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getCount: function() {
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return 1;
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},
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/**
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* Sets the top of the element.
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*
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* @param {number} _value
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*/
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setTop: function(_value) {
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this._top = _value;
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},
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/**
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* Sets the index of the element.
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*
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* @param {number} _value
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*/
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setIndex: function(_value) {
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this._index = _value;
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},
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/* -- et2_dataview_IInvalidatable -- */
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/**
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* Broadcasts an invalidation through the container tree. Marks the own
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* height as invalid.
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*/
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invalidate: function() {
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// Abort if this element is already marked as invalid.
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if (this._height !== false)
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{
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// Delete the own, probably computed height
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this._height = false;
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// Broadcast the invalidation to the parent element
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this._parent.invalidate();
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}
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},
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/* -- PRIVATE FUNCTIONS -- */
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/**
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* Used to check whether an element is visible or not (non recursive).
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*
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* @param _obj is the element which should be checked for visibility, it is
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* only checked whether some stylesheet makes the element invisible, not if
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* the given object is actually inside the DOM.
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*/
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_isVisible: function(_obj) {
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// Check whether the element is localy invisible
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if (_obj.style && (_obj.style.display === "none"
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|| _obj.style.visiblity === "none"))
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{
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return false;
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}
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// Get the computed style of the element
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var style = window.getComputedStyle ? window.getComputedStyle(_obj, null)
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: _obj.currentStyle;
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if (style.display === "none" || style.visibility === "none")
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{
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return false;
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}
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return true;
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},
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/**
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* Returns the height of a node in pixels and zero if the element is not
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* visible. The height is clamped to positive values.
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*
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* @param {DOMElement} _node
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*/
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_nodeHeight: function(_node)
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{
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return _node.offsetHeight;
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}
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});}).call(this);
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