egroupware/phpgwapi/js/egw_action/egw_grid_data.js

1466 lines
34 KiB
JavaScript

/**
* eGroupWare egw_action framework - egw action framework
*
* @link http://www.egroupware.org
* @author Andreas Stöckel <as@stylite.de>
* @copyright 2011 by Andreas Stöckel
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package egw_action
* @version $Id$
*/
/*
uses
egw_action,
egw_action_common,
egw_grid_columns;
*/
/** -- egwGridDataElement Class -- **/
var EGW_DATA_TYPE_RANGE = 0;
var EGW_DATA_TYPE_ELEMENT = 1;
/**
* Contains the data (model) objects which retrieve data from the given source and
* pass it to.
*
* @param object _parent the parent data element in which the new element is contained
* @param object _columns the columns object which contains information about the data columns
* @param object _readQueue is the queue object which queues data-fetching calls and executes these
* asynchronously.
* @param object _objectManager if this element is the root element (_parent is null),
* specify the _objectManager in order to supply a parent object manager for that
* element.
*/
function egwGridDataElement(_id, _parent, _columns, _readQueue, _objectManager)
{
// Copy the passed arguments
this.id = _id;
this.parent = _parent;
this.columns = _columns;
this.readQueue = _readQueue;
// Generate the action object associated to this element
this.parentActionObject = _parent ? _parent.actionObject : _objectManager;
this.actionObject = null;
// If this is the root object, add the an root action object to the objectManager
if (!_parent)
{
this.actionObject = this.parentActionObject.addObject(_id, null,
EGW_AO_FLAG_IS_CONTAINER | EGW_AO_FLAG_DEFAULT_FOCUS);
this.readQueue.setDataRoot(this);
}
// Preset some parameters
this.children = [];
this.data = {};
this.caption = false;
this.iconUrl = false;
this.iconSize = false;
this.iconOverlay = [];
this.opened = _parent == null;
this.index = 0;
this.canHaveChildren = false;
this.type = egwGridViewRow;
this.userData = null;
this.updatedGrid = null;
this.actionLinkGroups = {};
this.group = false;
this.capColTime = 0;
this.rowClass = "";
this.gridViewObj = null;
}
var EGW_GRID_DATA_UPDATE_TIME = 0;
egwGridDataElement.prototype.free = function()
{
//TODO
}
egwGridDataElement.prototype.set_rowClass = function(_value)
{
if (_value != this.rowClass)
{
this.rowClass = _value;
}
}
egwGridDataElement.prototype.set_caption = function(_value)
{
if (_value != this.caption)
{
this.capColTime = EGW_GRID_DATA_UPDATE_TIME;
this.caption = _value;
}
}
egwGridDataElement.prototype.set_iconUrl = function(_value)
{
if (_value != this.iconUrl)
{
this.capColTime = EGW_GRID_DATA_UPDATE_TIME;
this.iconUrl = _value;
}
}
egwGridDataElement.prototype.set_iconOverlay = function(_value)
{
if (!egwArraysEqual(_value, this.iconOverlay))
{
this.capColTime = EGW_GRID_DATA_UPDATE_TIME;
this.iconOverlay = _value;
}
}
egwGridDataElement.prototype.set_iconSize = function(_value)
{
if (_value != this.iconSize)
{
this.capColTime = EGW_GRID_DATA_UPDATE_TIME;
this.iconSize = _value;
}
}
egwGridDataElement.prototype.set_opened = function(_value)
{
this.opened = _value;
}
egwGridDataElement.prototype.set_canHaveChildren = function(_value)
{
// Calculate the canHaveChildren value which would really be set
var rv = _value && (this.children.length == 0);
if (rv != this.canHaveChildren)
{
this.canHaveChildren = _value;
this.capColTime = EGW_GRID_DATA_UPDATE_TIME;
}
}
egwGridDataElement.prototype.set_group = function(_value)
{
this.group = _value;
var root = this.getRootElement();
if (typeof root.actionLinkGroups[_value] != "undefined")
{
this.actionObject.updateActionLinks(root.actionLinkGroups[_value]);
}
}
/**
* Updates the column data. The column data is an object (used as associative array)
* which may be of the following outline:
*
* {
* "[col1_id]": "[data]",
* "[col2_id]":
* {
* "data": "[data]",
* "sortData": "[sortData]"
* }
* }
*
* "sortData" is data which is used for sorting instead of "data" when set.
*/
egwGridDataElement.prototype.set_data = function(_value)
{
if (typeof _value == "object" && _value.constructor == Object)
{
// Update the column data specified in the value
for (col_id in _value)
{
var val = _value[col_id];
var data = "";
var sortData = null;
if (typeof val == "object")
{
data = typeof val.data != "undefined" ? val.data : "";
sortData = typeof val.sortData != "undefined" ? val.sortData : null;
}
else
{
data = val;
}
// Set the data column timestamp - this is used inside the grid_view
// row unit in order to only update data which has really changed
var ts = 0;
var newData = true;
if (typeof this.data[col_id] != "undefined" && this.data[col_id].data == data)
{
ts = this.data[col_id].ts;
newData = false;
}
if (newData)
{
ts = EGW_GRID_DATA_UPDATE_TIME;
}
this.data[col_id] = {
"data": data,
"sortData": sortData,
"queued": false,
"time": ts
}
}
}
}
egwGridDataElement.prototype.addClass = function(_value) {
// Split the string into individual classes
classes = this.rowClass.split(' ');
// Add the given class if it is not already set
if (classes.indexOf(_value) == -1)
{
classes.push(_value);
// Write the new value
this.rowClass = classes.join(' ');
// Update the grid element
this.callGridViewObjectUpdate();
}
}
egwGridDataElement.prototype.removeClass = function(_value) {
// Split the string into individual classes
classes = this.rowClass.split(' ');
// Remove the given value if it exists
var idx = classes.indexOf(_value);
if (idx > -1)
{
classes.splice(idx, 1);
// Write the new value
this.rowClass = classes.join(' ');
// Update the grid element
this.callGridViewObjectUpdate();
}
}
/**
* Loads data into the GridData element. This function has two basic operating modes:
*
* 1. If an array of objects is passed, the specified objects are added as children.
* If a child node with the given ID already exists, it is updated.
* The given data array must have the following form:
* [
* {
* ["entryType": (EGW_DATA_TYPE_ELEMENT | EGW_DATA_TYPE_RANGE)] // Defaults to EGW_DATA_TYPE_ELEMENT
* "type": "[Typeclass]" // Typeclass of the view-container: specifies the chars after the egwGridView-prefix. Defaults to "Row" which becomes "egwGridViewRow",
* IF EGW_DATA_TYPE_ELEMENT:
* "id": [ Name of the element ]
* "children": [ Objects which will be added to the children of the element ]
* ELEMENT DATA // See below
IF EGW_DATA_TYPE_RANGE:
"count": [Count of Elements], | "ids": [ Array with element ids ],
"group": [ Action Link Group to which the generated objects should be added ]
"prefix": "[String prefix which will be added to each element including their index in the list]"
* }
* ]
*
* 2. If a string or number is passed, inside an array, it is encapsulated into
* an empty entry with that id
*
* 3. If an object with element dara is passed, the properties of the element will
* be updated to the given values.
*
* {
* "data": { COLUMN DATA OBJECT } // See "set_data" function
* "caption": "[Caption]" // Used in the EGW_COL_TYPE_NAME_ICON_FIXED column
* "iconUrl": "[IconUrl]" // Used in the EGW_COL_TYPE_NAME_ICON_FIXED column
* "opened": [true|false] // Specifies whether the row is "opened" or "closed" (in trees)
* "canHaveChildren": [true|false] // Specifies whether the row "open/close" button is displayed
* }
*/
egwGridDataElement.prototype.loadData = function(_data, _doCallUpdate)
{
// Store the current timestamp
EGW_GRID_DATA_UPDATE_TIME = (new Date).getTime();
if (typeof _doCallUpdate == "undefined")
{
_doCallUpdate = false;
}
if (_data.constructor == Array)
{
var virgin = this.children.length == 0;
var last_element = null;
for (var i = 0; i < _data.length; i++)
{
var entry = _data[i];
// Single string entries are automatically converted to an entry
// with that id
if (typeof entry == String || typeof entry == Number)
{
entry = {
"id": (entry + '') // The "+ ''" converts the entry to a string
}
}
if (entry.constructor != Object)
{
continue;
}
var element = null;
// Read the entry type and the element type (if they are set)
var entryType = typeof entry.entryType == "number" ? entry.entryType :
EGW_DATA_TYPE_ELEMENT;
var type = (typeof entry.type == "string") && (typeof window["egwGridView" + entry.type] == "function") ?
window["egwGridView" + entry.type] : egwGridViewRow;
// Inserts a range of given dummy elements into the data tree
if (entryType == EGW_DATA_TYPE_RANGE)
{
var prefix = typeof entry.prefix == "string" ? entry.prefix : "elem_";
var canHaveChildren = typeof entry.canHaveChildren == "boolean" ? entry.canHaveChildren : false;
var index = last_element ? last_element.index + 1 : 0;
var group = typeof entry.group == "string" ? entry.group : false;
var ids = [];
if (typeof entry.ids != "undefined")
{
ids = entry.ids;
}
else if (typeof entry.count != "undefined")
{
var count = typeof entry.count == "number" && entry.count >= 0 ? entry.count : 1;
for (var j = 0; j < count; j++)
{
ids.push(prefix + (index + j));
}
}
for (var j = 0; j < ids.length; j++)
{
element = this.insertElement(index + j, ids[j]);
element.type = type; // Type can only be set directly after creation
element.canHaveChildren = canHaveChildren;
if (group !== false)
{
element.set_group(group);
}
}
}
else if (entryType == EGW_DATA_TYPE_ELEMENT)
{
var id = typeof entry.id == "string" ? entry.id : "";
element = null;
if (!virgin && id)
{
element = this.getElementById(id, 1);
}
if (!element)
{
element = this.insertElement(false, id);
element.type = type; // Type can only be set directly after creation
}
element.loadData(entry);
}
last_element = element;
}
}
else
{
// Load all the data element for which a setter function exists
egwActionStoreJSON(_data, this, true);
// Load the child data
if (typeof _data.children != "undefined" && _data.children.constructor == Array)
{
this.loadData(_data.children);
}
if (_doCallUpdate)
{
this.callBeginUpdate();
}
this.callGridViewObjectUpdate();
}
}
/**
* Resets all relevant data (the column data, icon and icon size) of the element
* and triggers a gridViewObj update.
*/
egwGridDataElement.prototype.clearData = function()
{
this.data = {};
this.caption = false;
this.iconUrl = false;
this.iconSize = false;
this.capColTime = 0;
this.callGridViewObjectUpdate();
}
/**
* Inserts a new element as child at the given position
*
* @param integer _index is the index at which the element will be inserted. If
* false, the element will be added to the end of the list.
* @param string _id is the id of the newly created element
* @returns the newly created element
*/
egwGridDataElement.prototype.insertElement = function(_index, _id)
{
if (!_index)
{
_index = this.children.length;
}
else
{
_index = Math.max(0, Math.min(this.children.length, _index));
}
// Create the data element
var element = new egwGridDataElement(_id, this, this.columns, this.readQueue,
null);
element.index = _index;
// Create the action object with a temporary AOI which can be used to make
// the object visible
var object = this.actionObject.insertObject(_index, _id,
new egwGridTmpAOI(this.getRootElement().gridObject, _index), 0);
object.data = element;
// Link the two together
element.actionObject = object;
// As this element now at least has one child, "canHaveChildren" must be true
this.canHaveChildren = true;
// Insert the element at the given index
this.children.splice(_index, 0, element);
// Increment the index of all following elements
for (var i = _index + 1; i < this.children.length; i++)
{
this.children[i].index++;
}
return element;
}
/**
* Adds a new data element as child to the end of the list.
*
* @param string _id is the object identifier
* @returns the newly created element
*/
egwGridDataElement.prototype.addElement = function(_id)
{
return this.insertElement(false, _id);
}
egwGridDataElement.prototype.removeElement = function()
{
//TODO
}
/**
* Searches for the element with the given id and returns it. _depth specifies
* the maximum recursion depth. May be omited.
*/
egwGridDataElement.prototype.getElementById = function(_id, _depth)
{
if (typeof _depth == "undefined")
{
_depth = -1;
}
// Check whether this element is the searched one, if yes return it
if (_id == this.id)
{
return this;
}
// Only continue searching in deeper levels, if the given depth is greater than
// zero, or hasn't been defined and is therefore smaller than zero
if (_depth < 0 || _depth > 0)
{
for (var i = 0; i < this.children.length; i++)
{
var elem = this.children[i].getElementById(_id, _depth - 1);
if (elem)
{
return elem;
}
}
}
return null;
}
/**
* Returns all children as array - this list will be used to set the item list
* of the egwGridViewSpacer containers.
*/
egwGridDataElement.prototype.getChildren = function(_callback, _context)
{
if (this.children.length > 0)
{
_callback.call(_context, this.children, true);
}
else if (this.canHaveChildren)
{
// If the children havn't been loaded yet, request them via queue call.
this.readQueue.queueCall(this, EGW_DATA_QUEUE_CHILDREN, function() {
_callback.call(_context, this.children, false);
}, this);
}
}
egwGridDataElement.prototype.hasColumn = function(_columnId, _returnData)
{
// Get the column
var col = this.columns.getColumnById(_columnId);
var res = null;
if (col)
{
res = false;
// Check whether the queried column is the "EGW_COL_TYPE_NAME_ICON_FIXED" column
if (col.type == EGW_COL_TYPE_NAME_ICON_FIXED)
{
if (this.caption !== false)
{
if (_returnData)
{
res = {
"caption": this.caption,
"iconUrl": this.iconUrl,
"time": this.capColTime,
"queued": false
}
}
else
{
res = true;
}
}
if (!_returnData && typeof (this.data[_columnId]) != "undefined" && this.data[_columnId].queued)
{
res = true;
}
}
else if (col.type == EGW_COL_TYPE_CHECKBOX)
{
if (!_returnData)
{
res = true; // Tell the loader that the checkbox data is always available
}
else
{
var dataSet = (typeof this.data[_columnId] != "undefined");
res = {
"data": dataSet ? this.data[_columnId].data : 0,
"time": dataSet ? this.data[_columnId].time : this.capColTime,
"queued": false
}
}
}
else
{
// Check whether the column data of this column has been read,
// if yes, return it.
if (typeof this.data[_columnId] != "undefined")
{
if (_returnData)
{
// If the data should be returned, simply return it
if (typeof this.data[_columnId].data != "undefined")
{
res = this.data[_columnId];
}
}
else
{
// Otherwise check whether the data has been loaded - if this
// is the case, return true
if (typeof this.data[_columnId].data != "undefined")
{
res = true;
}
else
{
// Otherwise return the "queued" state
res = this.data[_columnId].queued;
}
}
}
// Probably there is a default value specified for this column...
else if (col["default"] !== EGW_COL_DEFAULT_FETCH)
{
if (_returnData)
{
res = col["default"];
}
else
{
res = true;
}
}
}
}
return res;
}
/**
* Returns the data for the given columns or incomplete data if those columns
* are not available now. Those columns are loaded asynchronously in the background
* and the GridViewObject is informed about this as soon as the new data has been
* loaded.
*
* @param _columnIds is an array of column ids for which the data should be returned
*/
egwGridDataElement.prototype.getData = function(_columnIds)
{
var queryList = [];
var result = {};
for (var i = 0; i < _columnIds.length; i++)
{
var res = this.hasColumn(_columnIds[i], true);
// Either add the result to the result list (if the column data was available)
// or add it to the query list.
if (res !== null)
{
if (res !== false)
{
if (typeof res.queued != "undefined" && res.queued != false)
{
result[_columnIds[i]] = false;
}
else
{
result[_columnIds[i]] = res;
}
}
else
{
queryList.push(_columnIds[i]);
}
}
}
// If one data entry hasn't been available, queue the request for this data
// in the readQueue
if (queryList.length > 0)
{
this.readQueue.queueCall(this, queryList);
}
return result;
}
/**
* Calls the row object update function - checks whether the row object implements
* this interface and whether it is set.
*/
egwGridDataElement.prototype.callGridViewObjectUpdate = function(_immediate)
{
if (typeof _immediate == "undefined")
{
_immediate = false;
}
if (this.gridViewObj && typeof this.gridViewObj.doUpdateData == "function")
{
this.gridViewObj.doUpdateData(_immediate);
}
}
egwGridDataElement.prototype.getDeepestOpened = function()
{
if (this.opened && this.children.length > 0)
{
return this.children[this.children.length - 1].getDeepestOpened();
}
else
{
return this;
}
}
/**
* Returns whether this data element is a odd or even one
*/
egwGridDataElement.prototype.isOdd = function()
{
return (this.index % 2) == 0; // Improve - old exact version needed way too much performance
}
/**
* Function which is called by the grid view container in order to update the
* action object aoi.
*/
egwGridDataElement.prototype.setGridViewObj = function(_obj)
{
this.gridViewObj = _obj;
if (_obj && typeof _obj.getAOI == "function")
{
var aoi = _obj.getAOI();
this.actionObject.setAOI(aoi);
aoi.reconnectActions();
}
else
{
this.actionObject.setAOI(null);
}
}
/**
* Returns the root element
*/
egwGridDataElement.prototype.getRootElement = function()
{
if (!this.parent)
{
return this;
}
else
{
return this.parent.getRootElement();
}
}
/**
* Returns the depth of this element in the document tree
*/
egwGridDataElement.prototype.getDepth = function()
{
return (this.parent) ? (this.parent.getDepth() + 1) : 0;
}
/**
* Calls the beginUpdate function of the grid associated to the grid view object
*/
egwGridDataElement.prototype.callBeginUpdate = function()
{
if (this.gridViewObj)
{
var root = this.getRootElement();
if (root.updatedGrid != this.gridViewObj.grid)
{
if (root.updatedGrid)
{
root.updatedGrid.endUpdate();
}
root.updatedGrid = this.gridViewObj.grid;
root.updatedGrid.beginUpdate();
}
}
}
/**
* Calls the end update function of the currently active updated grid
*/
egwGridDataElement.prototype.callEndUpdate = function()
{
var root = this.getRootElement();
if (root.updatedGrid)
{
root.updatedGrid.endUpdate();
root.updatedGrid = null;
}
}
/**
* Deletes all child elements
*/
egwGridDataElement.prototype.empty = function()
{
this.children = [];
// Prevent all event handlers which are associated to elements in the read
// queue from being called - those elements might no longer exist
this.readQueue.flushEventQueue();
}
/**
* Returns all parents in a list
*/
egwGridDataElement.prototype.getParentList = function(_lst)
{
if (typeof _lst == "undefined")
{
_lst = [];
}
_lst.push(this);
if (this.parent)
{
this.parent.getParentList(_lst);
}
return _lst;
}
/**
* Requires a certain column to have all data localy - if this isn't the case,
* the data is fetched from the server.
*
* @param string _colId specifies the column which should be loaded
* @param function _callback is the function which should be called once all data
* has been fetched.
* @param object _context is the context in which the callback should be executed
* @param object _loadIds is used internally to accumulate the object ids which
* should be loaded.
*/
egwGridDataElement.prototype.requireColumn = function(_colId, _callback, _context,
_loadElems)
{
var outerCall = false;
if (typeof _loadElems == "undefined")
{
_loadElems = {
"elems": []
}
outerCall = true;
}
if (!outerCall && !this.hasColumn(_colId, false))
{
_loadElems.elems.push(this);
}
for (var i = 0; i < this.children.length; i++)
{
this.children[i].requireColumn(_colId, null, null, _loadElems);
}
// TODO: In which cases has this to be aborted?
if (outerCall)
{
if (_loadElems.elems.length > 0)
{
this.readQueue.queueCall(_loadElems.elems, [_colId], function() {
_callback.call(_context);
}, null);
}
else
{
// If all elements had been loaded, postpone calling the callback function
window.setTimeout(function() {
_callback.call(_context);
}, 0);
}
}
}
/**
* Sorts the data element by the given column, the given sort direction and the
* given sort mode - if the tree doesn't have all the column data loaded which is
* needed for sorting, it first queries it from the server.
*
* @param string _colId is the id of the column
* @param int _dir is one of EGW_COL_SORTMODE_*
* @param int _mode is one of EGW_COL_SORTABLE_*
* @param function _callback is a callback function which is called once the
* sorting is done
* @param
* @param boolean _outerCall is used internally, do not specify it
*/
egwGridDataElement.prototype.sortChildren = function(_colId, _dir, _mode, _callback,
_context, _outerCall)
{
if (typeof _outerCall == "undefined")
{
_outerCall = true;
}
// If this is the outer call of the function, we first have to make sure
// that all data for the given column id is available
if (_outerCall)
{
this.requireColumn(_colId, function() {
// Call the actual sort part of this function by explicitly passing "false"
// to the _outerCall parameter
this.sortChildren(_colId, _dir, _mode, _callback, _context, false);
_callback.call(_context);
}, this);
}
else
{
// Select the sort function
var sortFunc = null;
switch (_mode) {
case EGW_COL_SORTABLE_ALPHABETIC:
sortFunc = egwGridData_sortAlphabetic;
break;
case EGW_COL_SORTABLE_NATURAL:
sortFunc = egwGridData_sortNatural;
break;
case EGW_COL_SORTABLE_NUMERICAL:
sortFunc = egwGridData_sortNumerical;
break;
}
var col = this.columns.getColumnById(_colId);
// Determine the mode multiplier which is used to sort the list in the
// given direction.
var dirMul = (_dir == EGW_COL_SORTMODE_ASC) ? 1 : -1;
this.children.sort(function (a, b) {
// Fetch the sortData or the regular data from the a and b element
// and pass it to the sort function
var aData = "";
var bData = "";
switch (col.type)
{
case EGW_COL_TYPE_DEFAULT:
aData = a.data[_colId].sortData === null ? a.data[_colId].data :
a.data[_colId].sortData;
bData = b.data[_colId].sortData === null ? b.data[_colId].data :
b.data[_colId].sortData;
break;
case EGW_COL_TYPE_NAME_ICON_FIXED:
aData = a.caption;
bData = b.caption;
break;
case EGW_COL_TYPE_CHECKBOX:
aData = a.actionObject.getSelected() ? 1 : 0;
bData = b.actionObject.getSelected() ? 1 : 0;
break;
}
return sortFunc(aData, bData) * dirMul;
});
// Sort all children
for (var i = 0; i < this.children.length; i++)
{
this.children[i].sortChildren(_colId, _dir, _mode, null, null, false);
}
// Sorting is done - call the callback function
if (_callback)
{
_callback.call(_context);
}
}
}
function egwGridData_sortAlphabetic(a, b)
{
return (a > b) ? 1 : -1;
}
function egwGridData_sortNumerical(a, b)
{
aa = parseFloat(a);
bb = parseFloat(b);
return (aa > bb) ? 1 : -1;
}
/**
* See http://my.opera.com/GreyWyvern/blog/show.dml/1671288
*/
function egwGridData_sortNatural(a, b)
{
function chunkify(t)
{
var tz = [], x = 0, y = -1, n = 0, i, j;
while (i = (j = t.charAt(x++)).charCodeAt(0))
{
var m = (i == 46 || (i >=48 && i <= 57));
if (m !== n)
{
tz[++y] = "";
n = m;
}
tz[y] += j;
}
return tz;
}
var aa = chunkify(a);
var bb = chunkify(b);
for (x = 0; aa[x] && bb[x]; x++)
{
if (aa[x] !== bb[x])
{
var c = Number(aa[x]), d = Number(bb[x]);
if (c == aa[x] && d == bb[x])
{
return c - d;
}
else
{
return (aa[x] > bb[x]) ? 1 : -1;
}
}
}
return aa.length - bb.length;
}
/**
* Returns the outermost parent of a set of elements - assume the following tree
* where the elements marked with "x" are passed as array to this function:
*
* ROOT
* |- CHILD 1
* |- SUB_CHILD 1
* |- SUB_CHILD 2 (x)
* |- CHILD 2
* |- SUB_CHILD 1
* |- SUB_SUB_CHILD 1 (x)
* The function should now return the "ROOT" elements as this is the outermost
* parent the elements have in common.
*
* TODO: If I think about this, the function actually doesn't work like I'd like
* it to behave...
*/
function egwGridData_getOutermostParent(_elements)
{
var minElem = null;
var minCnt = 0;
for (var i = 0; i < _elements.length; i++)
{
var parents = _elements[i].getParentList();
if (i == 0 || parents.length < minCnt)
{
minCnt = parents.length;
minElem = _elements[i];
}
}
return minElem ? (minElem.parent ? minElem.parent : minElem) : null;
}
/** - egwGridDataReadQueue -- **/
// Some internally used constants
var EGW_DATA_QUEUE_ELEM = 0;
var EGW_DATA_QUEUE_CHILDREN = 1;
// Count of elements which are dynamically added to the update list.
var EGW_DATA_QUEUE_PREFETCH_COUNT = 50;
// Timeout after which the queue events are no longer queued but the actual
// callback function is called.
var EGW_DATA_QUEUE_FLUSH_TIMEOUT = 200;
// Maximum count of elements in the queue after which the queue is flushed
var EGW_DATA_QUEUE_MAX_ELEM_COUNT = 100;
function egwGridDataQueue(_fetchCallback, _context)
{
this.fetchCallback = _fetchCallback;
this.context = _context;
this.dataRoot = null;
this.queue = [];
this.queueColumns = [];
this.timeoutId = 0;
this.eventQueue = new egwEventQueue();
}
/**
* Prevents handling the response function - e.g. if the data elements got emptied.
*/
egwGridDataQueue.prototype.flushEventQueue = function()
{
this.eventQueue.flush();
}
egwGridDataQueue.prototype.setDataRoot = function(_dataRoot)
{
this.dataRoot = _dataRoot;
}
/**
* Adds an element to the queue and checks whether its element count is larger
* than the one specified in EGW_DATA_QUEUE_MAX_ELEM_COUNT. If this is the case,
* the queue is flushed and false is returned, otherwise true.
*/
egwGridDataQueue.prototype._queue = function(_obj, _last)
{
this.timeoutId++;
// Push the queue object onto the queue
this.queue.push(_obj);
if (_last && this.queue.length > EGW_DATA_QUEUE_MAX_ELEM_COUNT)
{
this.flushQueue(false);
return false;
}
else
{
// Specify that the element data is queued
if (_obj.type != EGW_DATA_QUEUE_CHILDREN)
{
for (var i = 0; i < this.queueColumns.length; i++)
{
if (typeof _obj.elem.data[this.queueColumns[i]] == "undefined")
{
_obj.elem.data[this.queueColumns[i]] = {
"queued": true
}
}
}
}
// Set the flush queue timeout
if (_last)
{
var tid = this.timeoutId;
var self = this;
this.eventQueue.queueTimeout(this.flushQueue, this, [true],
"dataQueueTimeout", EGW_DATA_QUEUE_FLUSH_TIMEOUT);
}
}
return true;
}
egwGridDataQueue.prototype._accumulateQueueColumns = function(_columns)
{
if (this.dataRoot.columns.columns.length > this.queueColumns.length)
{
// Merge the specified columns into the queueColumns variable
for (var i = 0; i < _columns.length; i++)
{
if (this.queueColumns.indexOf(_columns[i]) == -1)
{
this.queueColumns.push(_columns[i]);
}
}
}
}
/**
* Queues the given element in the fetch-data queue.
*
* @param object/array _elems is a single element or an array of elements -
* their data will be fetched
* @param array _columns is an array of column ids which should be fetched. Those
* columns will be accumulated over the queue calls. _columns may also take
* the value EGW_DATA_QUEUE_CHILDREN in which case a request for the children
* of the given element is queued.
* @param function _callback is a callback function which will be called after
* the data has been sent from the server.
* @param object _context is the context in which the callback function will
* be executed.
*/
egwGridDataQueue.prototype.queueCall = function(_elems, _columns, _callback, _context)
{
if (typeof _callback == "undefined")
{
_callback = null;
}
if (typeof _context == "undefined")
{
_context = null;
}
if (!(_elems instanceof Array))
{
_elems = [_elems];
}
for (var i = 0; i < _elems.length; i++)
{
var last = i == _elems.length - 1;
if (_columns === EGW_DATA_QUEUE_CHILDREN)
{
this._queue({
"elem": _elems[i],
"type": EGW_DATA_QUEUE_CHILDREN,
"callback": last ? _callback : null,
"context": _context
}, last);
}
else
{
// Accumulate the queue columns ids
this._accumulateQueueColumns(_columns);
// Queue the element and search in the elements around the given one for
// elements whose data isn't loaded yet.
this._queue({
"elem": _elems[i],
"type": EGW_DATA_QUEUE_ELEM,
"callback": last ? _callback : null,
"context": _context
}, last);
}
}
}
egwGridDataQueue.prototype._getQueuePlanes = function()
{
var planes = [];
var curPlane = null;
for (var i = 0; i < this.queue.length; i++)
{
var elem = this.queue[i].elem;
if (!curPlane || elem.parent != curPlane.parent)
{
curPlane = null;
for (var j = 0; j < planes.length; j++)
{
if (planes[j].parent == elem.parent)
{
curPlane = planes[j];
break;
}
}
if (!curPlane)
{
curPlane = {
"parent": elem.parent,
"cnt": 0,
"min": 0,
"max": 0,
"idx": 0,
"done": false
};
planes.push(curPlane);
}
}
if (curPlane.cnt == 0 || elem.index < curPlane.min)
{
curPlane.min = elem.index;
}
if (curPlane.cnt == 0 || elem.index > curPlane.max)
{
curPlane.max = elem.index;
}
curPlane.cnt++;
}
return planes;
}
egwGridDataQueue.prototype.prefetch = function(_cnt)
{
var cnt = _cnt;
var planes = this._getQueuePlanes();
// Set the start indices
for (var i = 0; i < planes.length; i++)
{
planes[i].idx = Math.max(0, Math.ceil(planes[i].min - _cnt / (2 * planes.length)));
}
// Add as many elements as specified to the prefetched elements
var done = 0;
var plane = 0;
while (cnt > 0 && done < planes.length)
{
if (!planes[plane].done)
{
var idx = planes[plane].idx;
if (!planes[plane].parent || idx == planes[plane].parent.children.length)
{
planes[plane].done = true;
done++;
}
else
{
var hasData = true;
var elem = planes[plane].parent.children[idx];
for (var j = 0; j < this.queueColumns.length; j++)
{
if (!elem.hasColumn(this.queueColumns[j], false))
{
hasData = false;
break;
}
}
if (!hasData)
{
this._queue({
"elem": elem,
"type": EGW_DATA_QUEUE_ELEM,
"callback": null,
"context": null
});
cnt--;
}
planes[plane].idx++;
}
}
// Go to the next plane
plane = (plane + 1) % planes.length;
}
}
egwGridDataQueue.prototype.empty = function()
{
this.queue = [];
}
/**
* Empties the queue and calls the fetch callback which cares about retrieving
* the data from the server.
*/
egwGridDataQueue.prototype.flushQueue = function(_doPrefetch)
{
var ids = [];
if (_doPrefetch)
{
// Get the count of elements which will be dynamically added to the list, "prefetched"
var prefetch_cnt = Math.min(EGW_DATA_QUEUE_PREFETCH_COUNT,
Math.max(0, EGW_DATA_QUEUE_MAX_ELEM_COUNT - this.queue.length));
this.prefetch(prefetch_cnt);
}
// Generate a list of element ids
for (var i = 0; i < this.queue.length; i++)
{
var id = this.queue[i].elem.id;
if (id == this.queue[i].elem.id)
{
if (this.queue[i].type == EGW_DATA_QUEUE_CHILDREN)
{
id = "[CHILDREN]" + id;
}
}
ids.push(id);
}
// Check whether there actually are elements queued...
if (ids.length > 0)
{
// Call the fetch callback and save a snapshot of the current queue
var queue = this.queue;
this.fetchCallback.call(this.context, ids, this.queueColumns, function(_data) {
this.dataCallback(_data, queue);
}, this);
this.queue = [];
this.queueColumns = [];
this.timeoutId = 0;
}
}
/**
* Internal function which is called when the data is received from the fetchCallback.
*
* @param _data contains the data which has been retrieved by the fetchCallback
* @param _queue is the list of elements which had been requested.
*/
egwGridDataQueue.prototype.dataCallback = function(_data, _queue)
{
var rootData = [];
try
{
// Iterate over the given data and check whether the data coresponds to one
// of the queue elements - if yes, call their (probably) specified callback.
// All elements for which no queue element can be found are added to the
// "rootData" list, which is then loaded by the "dataRoot" data object.
var i = 0;
for (var i = 0; i < _data.length; i++)
{
var hasTarget = false;
// Search for a queue element which belongs to the given data entry.
if (_queue.length > 0 && typeof _data[i].id != "undefined")
{
var id = _data[i].id;
for (var j = 0; j < _queue.length; j++)
{
if (_queue[j].elem.id == id)
{
_queue[j].elem.loadData(_data[i], true);
// Call the queue object callback (if specified)
if (_queue[j].callback)
{
_queue[j].callback.call(_queue[j].context);
}
// Delete this queue element
_queue.splice(j, 1);
hasTarget = true;
break;
}
}
}
if (!hasTarget)
{
rootData.push(_data[i]);
}
}
this.dataRoot.loadData(rootData, true);
}
finally
{
this.dataRoot.callEndUpdate();
}
}