egroupware_official/phpgwapi/js/egw_action/egw_action_dragdrop.js

407 lines
9.4 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_action_popup,
jquery,
jquery-ui
*/
/**
* Register the drag and drop handlers
*/
if (typeof window._egwActionClasses == "undefined")
window._egwActionClasses = {}
_egwActionClasses["drag"] = {
"actionConstructor": egwDragAction,
"implementation": getDragImplementation
}
_egwActionClasses["drop"] = {
"actionConstructor": egwDropAction,
"implementation": getDropImplementation
}
/**
* The egwDragAction class overwrites the egwAction class and adds the new
* "dragType" propery. The "onExecute" event of the drag action will be called
* whenever dragging starts. The onExecute JS handler should return the
* drag-drop helper object - otherwise an default helper will be generated.
*/
function egwDragAction(_id, _handler, _caption, _icon, _onExecute, _allowOnMultiple)
{
var action = new egwAction(_id, _handler, _caption, _icon, _onExecute, _allowOnMultiple);
action.type = "drag";
action.dragType = "default";
action.hideOnDisabled = true;
action.set_dragType = function(_value) {
action.dragType = _value;
}
return action;
}
var
_dragActionImpl = null;
function getDragImplementation()
{
if (!_dragActionImpl)
{
_dragActionImpl = new egwDragActionImplementation();
}
return _dragActionImpl
}
function egwDragActionImplementation()
{
var ai = new egwActionImplementation();
ai.type = "drag";
ai.helper = null;
ai.ddTypes = [];
ai.selected = [];
ai.doRegisterAction = function(_aoi, _callback, _context)
{
var node = _aoi.getDOMNode();
if (node)
{
// Prevent selection
node.onselectstart = function () {
return false;
};
$(node).draggable(
{
"distance": 20,
"cursor": "move",
"cursorAt": { top: -12, left: -12 },
"helper": function(e) {
// The helper function is called before the start function
// is evoked. Call the given callback function. The callback
// function will gather the selected elements and action links
// and call the doExecuteImplementation function. This
// will call the onExecute function of the first action
// in order to obtain the helper object (stored in ai.helper)
// and the multiple dragDropTypes (ai.ddTypes)
_callback.call(_context, false, ai);
$(node).data("ddTypes", ai.ddTypes);
$(node).data("selected", ai.selected);
if (ai.helper)
{
// Append the helper object to the body element - this
// fixes a bug in IE: If the element isn't inserted into
// the DOM-tree jquery appends it to the parent node.
// In case this is a table it doesn't work correctly
$("body").append(ai.helper);
return ai.helper;
}
// Return an empty div if the helper dom node is not set
return $(document.createElement("div"));
},
"start": function(e) {
return ai.helper != null;
},
// Solves problem with scroll position changing in the grid
// component
"refreshPositions": true,
"scroll": false,
"containment": "document",
"iframeFix": true
}
);
return true;
}
return false;
}
ai.doUnregisterAction = function(_aoi)
{
//
}
/**
* Builds the context menu and shows it at the given position/DOM-Node.
*/
ai.doExecuteImplementation = function(_context, _selected, _links)
{
// Reset the helper object of the action implementation
this.helper = null;
var hasLink = false;
// Store the drag-drop types
this.ddTypes = [];
this.selected = _selected;
// Call the onExecute event of the first actionObject
for (var k in _links)
{
if (_links[k].visible)
{
hasLink = true;
// Only execute the following code if a JS function is registered
// for the action and this is the first action link
if (!this.helper && _links[k].actionObj.onExecute.hasHandler())
{
this.helper = _links[k].actionObj.execute(_selected);
}
// Push the dragType of the associated action object onto the
// drag type list - this allows an element to support multiple
// drag/drop types.
var type = _links[k].actionObj.dragType;
if (this.ddTypes.indexOf(type) == -1)
{
this.ddTypes.push(_links[k].actionObj.dragType);
}
}
}
// If no helper has been defined, create an default one
if (!this.helper && hasLink)
{
this.helper = $(document.createElement("div"));
this.helper.addClass("egw_action_ddHelper");
this.helper.text("(" + _selected.length + ")");
}
return true;
}
return ai;
}
/**
* The egwDropAction class overwrites the egwAction class and adds the "acceptedTypes"
* property. This array should contain all "dragTypes" the drop action is allowed
* to
*/
function egwDropAction(_id, _handler, _caption, _icon, _onExecute, _allowOnMultiple)
{
var action = new egwAction(_id, _handler, _caption, _icon, _onExecute, _allowOnMultiple);
action.type = "drop";
action.acceptedTypes = ["default"];
action.canHaveChildren = ["drag","popup"];
action["default"] = false;
action.order = 0;
action.group = 0;
action.set_default = function(_value) {
action["default"] = _value;
}
action.set_order = function(_value) {
action.order = _value;
}
action.set_group = function(_value) {
action.group = _value;
}
/**
* The acceptType property allows strings as well as arrays - strings are
* automatically included in an array.
*/
action.set_acceptedTypes = function(_value) {
if (_value instanceof Array)
{
action.acceptedTypes = _value;
}
else
{
action.acceptedTypes = [_value];
}
}
return action;
}
var
_dropActionImpl = null;
function getDropImplementation()
{
if (!_dropActionImpl)
{
_dropActionImpl = new egwDropActionImplementation();
}
return _dropActionImpl
}
var EGW_AI_DRAG = 0x0100; // Use the first byte as mask for event types - 01 is for events used with drag stuff
var EGW_AI_DRAG_OUT = EGW_AI_DRAG | 0x01;
var EGW_AI_DRAG_OVER = EGW_AI_DRAG | 0x02;
function egwDropActionImplementation()
{
var ai = new egwActionImplementation();
ai.type = "drop";
ai.doRegisterAction = function(_aoi, _callback, _context)
{
var node = _aoi.getDOMNode();
if (node)
{
$(node).droppable(
{
"accept": function(_draggable) {
var accepted = ai._fetchAccepted(
_callback.call(_context, "links", ai, EGW_AO_EXEC_THIS));
// Check whether all drag types of the selected objects
// are accepted
var ddTypes = _draggable.data("ddTypes");
for (var i = 0; i < ddTypes.length; i++)
{
if (accepted.indexOf(ddTypes[i]) == -1)
{
return false;
}
}
return true;
},
"drop": function(event, ui) {
var draggable = ui.draggable;
var ddTypes = draggable.data("ddTypes");
var selected = draggable.data("selected");
var links = _callback.call(_context, "links", ai, EGW_AO_EXEC_THIS);
// Disable all links which only accept types which are not
// inside ddTypes
for (var k in links)
{
var accepted = links[k].actionObj.acceptedTypes;
for (var i = 0; i < ddTypes.length; i++)
{
if (accepted.indexOf(ddTypes[i]) == -1)
{
links[k].enabled = false;
if (links[k].actionObj.hideOnDisabled)
{
links[k].visible = true;
}
}
}
}
// Check whether there is only one link
var cnt = 0;
var lnk = null;
for (var k in links)
{
if (links[k].enabled && links[k].visible)
{
lnk = links[k];
cnt += 1 + links[k].actionObj.children.length;
}
}
if (cnt == 1)
{
lnk.actionObj.execute(selected, _context);
}
if (cnt > 1)
{
// More than one drop action link is associated
// to the drop event - show those as a popup menu
// and let the user decide which one to use.
// This is possible as the popup and the popup action
// object and the drop action object share same
// set of properties.
var popup = getPopupImplementation();
var pos = popup._getPageXY(event);
window.setTimeout(function() {
popup.doExecuteImplementation(pos, selected, links,
_context);
}, 0); // Timeout is needed to have it working in IE
}
_aoi.triggerEvent(EGW_AI_DRAG_OUT);
},
"over": function() {
_aoi.triggerEvent(EGW_AI_DRAG_OVER);
},
"out": function() {
_aoi.triggerEvent(EGW_AI_DRAG_OUT);
},
"tolerance": "pointer"
}
);
return true;
}
return false;
}
ai.doUnregisterAction = function(_aoi)
{
//
}
ai._fetchAccepted = function(_links)
{
// Accumulate the accepted types
var accepted = [];
for (var k in _links)
{
for (var i = 0; i < _links[k].actionObj.acceptedTypes.length; i++)
{
var type = _links[k].actionObj.acceptedTypes[i];
if (accepted.indexOf(type) == -1)
{
accepted.push(type);
}
}
}
return accepted;
}
/**
* Builds the context menu and shows it at the given position/DOM-Node.
*/
ai.doExecuteImplementation = function(_context, _selected, _links)
{
if (_context == "links")
{
return _links;
}
}
return ai;
}