mirror of
https://github.com/EGroupware/egroupware.git
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276 lines
7.3 KiB
JavaScript
276 lines
7.3 KiB
JavaScript
/**
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* eGroupWare eTemplate2 - Class which contains the "grid" 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 dataview
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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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jquery.jquery;
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et2_core_common;
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et2_dataview_interfaces;
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et2_dataview_view_partitionTree;
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et2_dataview_view_row;
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et2_dataview_view_spacer;
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et2_dataview_view_rowProvider;
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*/
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/**
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* Determines how many pixels the view range of the gridview is extended.
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*/
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var ET2_GRID_VIEW_EXT = 25;
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/**
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* Determines the timeout after which the scroll-event is processed.
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*/
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var ET2_GRID_SCROLL_TIMEOUT = 25;
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var partitionTree = null;
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var et2_dataview_grid = Class.extend(et2_dataview_IViewRange, {
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/**
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* Creates the grid.
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*
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* @param _parent is the parent grid class - if null, this means that this
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* is the outer grid which manages the scrollarea. If not null, all other
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* parameters are ignored and copied from the given grid instance.
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* @param _outerId is the id of the grid container it uses for the css
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* classes.
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* @param _columnIds is the id of the individual columns used for the css
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* classes.
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* @param _avgHeight is the starting average height of the column rows.
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*/
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init: function(_parent, _outerId, _columnIds, _dataProvider, _rowProvider,
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_avgHeight) {
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// If the parent is given, copy all other parameters from it
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if (_parent != null)
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{
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this._outerId = _parent._outerId;
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this._columnIds = _parent._columnIds;
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this._dataProvider = _parent._dataProvider;
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this._avgHeight = _parent._partitionTree.getAverageHeight();
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this._rowProvider = _parent._rowProvider;
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}
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else
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{
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// Otherwise copy the given parameters
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this._outerId = _outerId;
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this._columnIds = _columnIds;
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this._dataProvider = _dataProvider;
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this._rowProvider = _rowProvider;
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this._avgHeight = _avgHeight;
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this._scrollHeight = 0;
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this._scrollTimeout = null;
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}
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// The "treeChanged" variable is called whenever the viewrange has been
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// set - changing the viewrange is the function which causes new elements
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// to be generated and thus the partition tree to degenerate
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this._treeChanged = false;
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// Count of elements which are buffered at top and bottom of the viewrange
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// before they get replaced with placeholders
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this._holdCount = 50;
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// The current range holds the currently visible nodes
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this._currentRange = et2_range(0, 0);
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// Build the grid outer nodes
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this._createNodes();
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// Create the partition tree object which is used to organize the tree
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// items.
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this._partitionTree = new et2_dataview_partitionTree(this._dataProvider,
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this._rowProvider, this._avgHeight, this.innerTbody);
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// Setup the "rebuild" timer - it rebuilds the complete partition tree
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// if any change has been done to it. Rebuilding the partition tree is
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// necessary as the tree structure happens to degenerate.
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var self = this;
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this._rebuildTimer = window.setInterval(function() {
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self._checkTreeRebuild();
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}, 10 * 1000);
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},
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destroy: function() {
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// Stop the scroll timeout
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if (this._scrollTimeout)
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{
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window.clearTimeout(this._scrollTimeout);
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}
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// Stop the rebuild timer
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window.clearInterval(this._rebuildTimer);
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// Free the partition tree
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this._partitionTree.free();
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},
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clear: function() {
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// Free the partition tree and recreate it
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this._avgHeight = this._partitionTree.getAverageHeight();
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this._partitionTree.free();
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this._partitionTree = new et2_dataview_partitionTree(this._dataProvider,
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this._rowProvider, this._avgHeight, this.innerTbody);
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// Set the viewrange again
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this.setViewRange(this._currentRange);
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},
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/**
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* The setViewRange function updates the range in which columns are shown.
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*/
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setViewRange: function(_range) {
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this._treeChanged = true;
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// Copy the given range
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this._currentRange = et2_bounds(_range.top, _range.bottom);
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// Display all elements in the given range
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var nodes = this._partitionTree.getRangeNodes(_range);
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for (var i = 0; i < nodes.length; i++)
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{
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if (nodes[i].implements(et2_dataview_IViewRange))
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{
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nodes[i].setViewRange(_range);
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}
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}
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// Calculate the range of the actually shown elements
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var displayTop = _range.top;
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var displayBottom = _range.bottom;
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if (nodes.length > 0)
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{
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displayTop = nodes[0].getPosTop();
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displayBottom = nodes[nodes.length - 1].getPosBottom();
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}
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// Hide everything except for _holdCount elements at the top and bottom
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// of the viewrange
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var ah = this._partitionTree.getAverageHeight();
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var reduceHeight = ah * this._holdCount;
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if (displayTop > reduceHeight)
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{
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this._partitionTree.reduceRange(et2_bounds(0, displayTop - reduceHeight));
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}
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if (displayBottom + reduceHeight < this._partitionTree.getHeight())
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{
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this._partitionTree.reduceRange(et2_bounds(displayBottom + reduceHeight,
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this._partitionTree.getHeight()));
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}
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},
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/**
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* Updates the scrollheight
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*/
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setScrollHeight: function(_height) {
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this._height = _height;
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// Update the height of the outer container
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if (this.scrollarea)
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{
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this.scrollarea.height(_height);
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}
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// Update the viewing range
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this.setViewRange(et2_range(this._currentRange.top, this._height));
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},
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/**
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* Returns the JQuery outer DOM-Node
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*/
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getJNode: function() {
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return this.outerCell;
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},
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/* ---- PRIVATE FUNCTIONS ---- */
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/**
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* Checks whether the partition tree has to be rebuilt and if yes, does
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* that.
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*/
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_checkTreeRebuild: function() {
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if (this._treeChanged)
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{
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var depth = this._partitionTree.getDepth();
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var count = this._partitionTree.getManagedCount();
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// Check whether the depth of the tree is very unproportional
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// regarding to the count of elements managed in it
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if (count < Math.pow(ET2_PARTITION_TREE_WIDTH, depth - 1))
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{
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egw.debug("info", "Rebuilding dataview partition tree");
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this._partitionTree.rebuild();
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egw.debug("info", "Done.");
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}
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// Reset the "treeChanged" function.
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this._treeChanged = false;
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}
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},
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/**
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* Creates the grid DOM-Nodes
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*/
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_createNodes: function() {
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this.outerCell = $j(document.createElement("td"))
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.addClass("frame")
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.attr("colspan", this._columnIds.length + (this._parent ? 0 : 1));
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// Create the scrollarea div if this is the outer grid
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this.scrollarea = null;
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if (this._parent == null)
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{
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this.scrollarea = $j(document.createElement("div"))
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.addClass("egwGridView_scrollarea")
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.scroll(this, function(e) {
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// Clear any older scroll timeout
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if (e.data._scrollTimeout)
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{
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window.clearTimeout(e.data._scrollTimeout);
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}
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// Set a new timeout which calls the setViewArea
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// function
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e.data._scrollTimeout = window.setTimeout(function() {
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if (typeof ET2_GRID_PAUSE != "undefined")
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return;
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e.data.setViewRange(et2_range(
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e.data.scrollarea.scrollTop() - ET2_GRID_VIEW_EXT,
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e.data._height + ET2_GRID_VIEW_EXT * 2
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));
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}, ET2_GRID_SCROLL_TIMEOUT);
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})
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.height(this._scrollHeight)
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.appendTo(this.outerCell);
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}
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// Create the inner table
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var table = $j(document.createElement("table"))
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.addClass("egwGridView_grid")
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.appendTo(this.scrollarea ? this.scrollarea : this.outerCell);
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this.innerTbody = $j(document.createElement("tbody"))
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.appendTo(table);
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}
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});
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