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pega_yui_dragdrop.js
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/*
Copyright (c) 2008, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.5.1
*/
/**
* The drag and drop utility provides a framework for building drag and drop
* applications. In addition to enabling drag and drop for specific elements,
* the drag and drop elements are tracked by the manager class, and the
* interactions between the various elements are tracked during the drag and
* the implementing code is notified about these important moments.
* @module dragdrop
* @title Drag and Drop
* @requires pega,dom,event
* @namespace pega.util
*/
// Only load the library once. Rewriting the manager class would orphan
// existing drag and drop instances.
if (!pega.util.DragDropMgr) {
/**
* DragDropMgr is a singleton that tracks the element interaction for
* all DragDrop items in the window. Generally, you will not call
* this class directly, but it does have helper methods that could
* be useful in your DragDrop implementations.
* @class DragDropMgr
* @static
*/
pega.util.DragDropMgr = function() {
var Event = pega.util.Event;
return {
/**
* Two dimensional Array of registered DragDrop objects. The first
* dimension is the DragDrop item group, the second the DragDrop
* object.
* @property ids
* @type {string: string}
* @private
* @static
*/
ids: {},
/**
* Array of element ids defined as drag handles. Used to determine
* if the element that generated the mousedown event is actually the
* handle and not the html element itself.
* @property handleIds
* @type {string: string}
* @private
* @static
*/
handleIds: {},
/**
* the DragDrop object that is currently being dragged
* @property dragCurrent
* @type DragDrop
* @private
* @static
**/
dragCurrent: null,
/**
* the DragDrop object(s) that are being hovered over
* @property dragOvers
* @type Array
* @private
* @static
*/
dragOvers: {},
/**
* the X distance between the cursor and the object being dragged
* @property deltaX
* @type int
* @private
* @static
*/
deltaX: 0,
/**
* the Y distance between the cursor and the object being dragged
* @property deltaY
* @type int
* @private
* @static
*/
deltaY: 0,
/**
* Flag to determine if we should prevent the default behavior of the
* events we define. By default this is true, but this can be set to
* false if you need the default behavior (not recommended)
* @property preventDefault
* @type boolean
* @static
*/
preventDefault: true,
/**
* Flag to determine if we should stop the propagation of the events
* we generate. This is true by default but you may want to set it to
* false if the html element contains other features that require the
* mouse click.
* @property stopPropagation
* @type boolean
* @static
*/
stopPropagation: true,
/**
* Internal flag that is set to true when drag and drop has been
* initialized
* @property initialized
* @private
* @static
*/
initialized: false,
/**
* All drag and drop can be disabled.
* @property locked
* @private
* @static
*/
locked: false,
/**
* Provides additional information about the the current set of
* interactions. Can be accessed from the event handlers. It
* contains the following properties:
*
* out: onDragOut interactions
* enter: onDragEnter interactions
* over: onDragOver interactions
* drop: onDragDrop interactions
* point: The location of the cursor
* draggedRegion: The location of dragged element at the time
* of the interaction
* sourceRegion: The location of the source elemtn at the time
* of the interaction
* validDrop: boolean
* @property interactionInfo
* @type object
* @static
*/
interactionInfo: null,
/**
* Called the first time an element is registered.
* @method init
* @private
* @static
*/
init: function() {
this.initialized = true;
},
/**
* In point mode, drag and drop interaction is defined by the
* location of the cursor during the drag/drop
* @property POINT
* @type int
* @static
* @final
*/
POINT: 0,
/**
* In intersect mode, drag and drop interaction is defined by the
* cursor position or the amount of overlap of two or more drag and
* drop objects.
* @property INTERSECT
* @type int
* @static
* @final
*/
INTERSECT: 1,
/**
* In intersect mode, drag and drop interaction is defined only by the
* overlap of two or more drag and drop objects.
* @property STRICT_INTERSECT
* @type int
* @static
* @final
*/
STRICT_INTERSECT: 2,
/**
* The current drag and drop mode. Default: POINT
* @property mode
* @type int
* @static
*/
mode: 0,
/**
* Runs method on all drag and drop objects
* @method _execOnAll
* @private
* @static
*/
_execOnAll: function(sMethod, args) {
for (var i in this.ids) {
for (var j in this.ids[i]) {
var oDD = this.ids[i][j];
if (! this.isTypeOfDD(oDD)) {
continue;
}
oDD[sMethod].apply(oDD, args);
}
}
},
/**
* Drag and drop initialization. Sets up the global event handlers
* @method _onLoad
* @private
* @static
*/
_onLoad: function() {
this.init();
Event.on(document, "mouseup", this.handleMouseUp, this, true);
Event.on(document, "mousemove", this.handleMouseMove, this, true);
Event.on(window, "unload", this._onUnload, this, true);
Event.on(window, "resize", this._onResize, this, true);
// Event.on(window, "mouseout", this._test);
},
/**
* Reset constraints on all drag and drop objs
* @method _onResize
* @private
* @static
*/
_onResize: function(e) {
this._execOnAll("resetConstraints", []);
},
/**
* Lock all drag and drop functionality
* @method lock
* @static
*/
lock: function() { this.locked = true; },
/**
* Unlock all drag and drop functionality
* @method unlock
* @static
*/
unlock: function() { this.locked = false; },
/**
* Is drag and drop locked?
* @method isLocked
* @return {boolean} True if drag and drop is locked, false otherwise.
* @static
*/
isLocked: function() { return this.locked; },
/**
* Location cache that is set for all drag drop objects when a drag is
* initiated, cleared when the drag is finished.
* @property locationCache
* @private
* @static
*/
locationCache: {},
/**
* Set useCache to false if you want to force object the lookup of each
* drag and drop linked element constantly during a drag.
* @property useCache
* @type boolean
* @static
*/
useCache: true,
/**
* The number of pixels that the mouse needs to move after the
* mousedown before the drag is initiated. Default=3;
* @property clickPixelThresh
* @type int
* @static
*/
clickPixelThresh: 3,
/**
* The number of milliseconds after the mousedown event to initiate the
* drag if we don't get a mouseup event. Default=1000
* @property clickTimeThresh
* @type int
* @static
*/
clickTimeThresh: 1000,
/**
* Flag that indicates that either the drag pixel threshold or the
* mousdown time threshold has been met
* @property dragThreshMet
* @type boolean
* @private
* @static
*/
dragThreshMet: false,
/**
* Timeout used for the click time threshold
* @property clickTimeout
* @type Object
* @private
* @static
*/
clickTimeout: null,
/**
* The X position of the mousedown event stored for later use when a
* drag threshold is met.
* @property startX
* @type int
* @private
* @static
*/
startX: 0,
/**
* The Y position of the mousedown event stored for later use when a
* drag threshold is met.
* @property startY
* @type int
* @private
* @static
*/
startY: 0,
/**
* Flag to determine if the drag event was fired from the click timeout and
* not the mouse move threshold.
* @property fromTimeout
* @type boolean
* @private
* @static
*/
fromTimeout: false,
_shimActive : false,
_shimState : false,
_shim : null,
_createShim : function() {
var s = document.createElement('div');
s.id = 'yui-ddm-shim';
if (document.body.firstChild) {
document.body.insertBefore(s, document.body.firstChild);
} else {
document.body.appendChild(s);
}
s.style.display = 'none';
s.style.backgroundColor = 'red';
s.style.position = 'absolute';
s.style.zIndex = '99999';
Dom.setStyle(s, 'opacity', '0');
this._shim = s;
Event.on(s, "mouseup", this.handleMouseUp, this, true);
Event.on(s, "mousemove", this.handleMouseMove, this, true);
Event.on(window, 'scroll', this._sizeShim, this, true);
},
_sizeShim : function() {
if (this._shimActive) {
var s = this._shim;
s.style.height = Dom.getDocumentHeight() + 'px';
s.style.width = Dom.getDocumentWidth() + 'px';
s.style.top = '0';
s.style.left = '0';
}
},
_activateShim : function() {
if (this.useShim) {
if (!this._shim) {
this._createShim();
}
this._shimActive = true;
var s = this._shim,
o = '0';
if (this._debugShim) {
o = '.5';
}
Dom.setStyle(s, 'opacity', o);
this._sizeShim();
s.style.display = 'block';
}
},
_deactivateShim : function() {
this._shim.style.display = 'none';
this._shimActive = false;
},
/**
* Each DragDrop instance must be registered with the DragDropMgr.
* This is executed in DragDrop.init()
* @method regDragDrop
* @param {DragDrop} oDD the DragDrop object to register
* @param {String} sGroup the name of the group this element belongs to
* @static
*/
regDragDrop: function(oDD, sGroup) {
if (!this.initialized) { this.init(); }
if (!this.ids[sGroup]) {
this.ids[sGroup] = {};
}
this.ids[sGroup][oDD.id] = oDD;
},
/**
* Removes the supplied dd instance from the supplied group. Executed
* by DragDrop.removeFromGroup, so don't call this function directly.
* @method removeDDFromGroup
* @private
* @static
*/
removeDDFromGroup: function(oDD, sGroup) {
if (!this.ids[sGroup]) {
this.ids[sGroup] = {};
}
var obj = this.ids[sGroup];
if (obj && obj[oDD.id]) {
delete obj[oDD.id];
}
},
/**
* Unregisters a drag and drop item. This is executed in
* DragDrop.unreg, use that method instead of calling this directly.
* @method _remove
* @private
* @static
*/
_remove: function(oDD) {
for (var g in oDD.groups) {
if (g && this.ids[g][oDD.id]) {
delete this.ids[g][oDD.id];
}
}
delete this.handleIds[oDD.id];
},
/**
* Each DragDrop handle element must be registered. This is done
* automatically when executing DragDrop.setHandleElId()
* @method regHandle
* @param {String} sDDId the DragDrop id this element is a handle for
* @param {String} sHandleId the id of the element that is the drag
* handle
* @static
*/
regHandle: function(sDDId, sHandleId) {
if (!this.handleIds[sDDId]) {
this.handleIds[sDDId] = {};
}
this.handleIds[sDDId][sHandleId] = sHandleId;
},
/**
* Utility function to determine if a given element has been
* registered as a drag drop item.
* @method isDragDrop
* @param {String} id the element id to check
* @return {boolean} true if this element is a DragDrop item,
* false otherwise
* @static
*/
isDragDrop: function(id) {
return ( this.getDDById(id) ) ? true : false;
},
/**
* Returns the drag and drop instances that are in all groups the
* passed in instance belongs to.
* @method getRelated
* @param {DragDrop} p_oDD the obj to get related data for
* @param {boolean} bTargetsOnly if true, only return targetable objs
* @return {DragDrop[]} the related instances
* @static
*/
getRelated: function(p_oDD, bTargetsOnly) {
var oDDs = [];
for (var i in p_oDD.groups) {
for (var j in this.ids[i]) {
var dd = this.ids[i][j];
if (! this.isTypeOfDD(dd)) {
continue;
}
if (!bTargetsOnly || dd.isTarget) {
oDDs[oDDs.length] = dd;
}
}
}
return oDDs;
},
/**
* Returns true if the specified dd target is a legal target for
* the specifice drag obj
* @method isLegalTarget
* @param {DragDrop} the drag obj
* @param {DragDrop} the target
* @return {boolean} true if the target is a legal target for the
* dd obj
* @static
*/
isLegalTarget: function (oDD, oTargetDD) {
var targets = this.getRelated(oDD, true);
for (var i=0, len=targets.length;i<len;++i) {
if (targets[i].id == oTargetDD.id) {
return true;
}
}
return false;
},
/**
* My goal is to be able to transparently determine if an object is
* typeof DragDrop, and the exact subclass of DragDrop. typeof
* returns "object", oDD.constructor.toString() always returns
* "DragDrop" and not the name of the subclass. So for now it just
* evaluates a well-known variable in DragDrop.
* @method isTypeOfDD
* @param {Object} the object to evaluate
* @return {boolean} true if typeof oDD = DragDrop
* @static
*/
isTypeOfDD: function (oDD) {
return (oDD && oDD.__ygDragDrop);
},
/**
* Utility function to determine if a given element has been
* registered as a drag drop handle for the given Drag Drop object.
* @method isHandle
* @param {String} id the element id to check
* @return {boolean} true if this element is a DragDrop handle, false
* otherwise
* @static
*/
isHandle: function(sDDId, sHandleId) {
return ( this.handleIds[sDDId] &&
this.handleIds[sDDId][sHandleId] );
},
/**
* Returns the DragDrop instance for a given id
* @method getDDById
* @param {String} id the id of the DragDrop object
* @return {DragDrop} the drag drop object, null if it is not found
* @static
*/
getDDById: function(id) {
for (var i in this.ids) {
if (this.ids[i][id]) {
return this.ids[i][id];
}
}
return null;
},
/**
* Fired after a registered DragDrop object gets the mousedown event.
* Sets up the events required to track the object being dragged
* @method handleMouseDown
* @param {Event} e the event
* @param oDD the DragDrop object being dragged
* @private
* @static
*/
handleMouseDown: function(e, oDD) {
this.currentTarget = pega.util.Event.getTarget(e);
this.dragCurrent = oDD;
var el = oDD.getEl();
// track start position
this.startX = pega.util.Event.getPageX(e);
this.startY = pega.util.Event.getPageY(e);
this.deltaX = this.startX - el.offsetLeft;
this.deltaY = this.startY - el.offsetTop;
this.dragThreshMet = false;
this.clickTimeout = setTimeout(
function() {
var DDM = pega.util.DDM;
DDM.startDrag(DDM.startX, DDM.startY);
DDM.fromTimeout = true;
},
this.clickTimeThresh );
},
/**
* Fired when either the drag pixel threshol or the mousedown hold
* time threshold has been met.
* @method startDrag
* @param x {int} the X position of the original mousedown
* @param y {int} the Y position of the original mousedown
* @static
*/
startDrag: function(x, y) {
if (this.dragCurrent && this.dragCurrent.useShim) {
this._shimState = this.useShim;
this.useShim = true;
}
this._activateShim();
clearTimeout(this.clickTimeout);
var dc = this.dragCurrent;
if (dc && dc.events.b4StartDrag) {
dc.b4StartDrag(x, y);
dc.fireEvent('b4StartDragEvent', { x: x, y: y });
}
if (dc && dc.events.startDrag) {
dc.startDrag(x, y);
dc.fireEvent('startDragEvent', { x: x, y: y });
}
this.dragThreshMet = true;
},
/**
* Internal function to handle the mouseup event. Will be invoked
* from the context of the document.
* @method handleMouseUp
* @param {Event} e the event
* @private
* @static
*/
handleMouseUp: function(e) {
if (this.dragCurrent){
clearTimeout(this.clickTimeout);
if (this.dragThreshMet) {
if (this.fromTimeout) {
this.fromTimeout = false;
this.handleMouseMove(e);
}
this.fromTimeout = false;
this.fireEvents(e, true);
}
this.stopDrag(e);
this.stopEvent(e);
}
},
/**
* Utility to stop event propagation and event default, if these
* features are turned on.
* @method stopEvent
* @param {Event} e the event as returned by this.getEvent()
* @static
*/
stopEvent: function(e) {
if (this.stopPropagation) {
pega.util.Event.stopPropagation(e);
}
if (this.preventDefault) {
pega.util.Event.preventDefault(e);
}
},
/**
* Ends the current drag, cleans up the state, and fires the endDrag
* and mouseUp events. Called internally when a mouseup is detected
* during the drag. Can be fired manually during the drag by passing
* either another event (such as the mousemove event received in onDrag)
* or a fake event with pageX and pageY defined (so that endDrag and
* onMouseUp have usable position data.). Alternatively, pass true
* for the silent parameter so that the endDrag and onMouseUp events
* are skipped (so no event data is needed.)
*
* @method stopDrag
* @param {Event} e the mouseup event, another event (or a fake event)
* with pageX and pageY defined, or nothing if the
* silent parameter is true
* @param {boolean} silent skips the enddrag and mouseup events if true
* @static
*/
stopDrag: function(e, silent) {
var dc = this.dragCurrent;
// Fire the drag end event for the item that was dragged
if (dc && !silent) {
if (this.dragThreshMet) {
if (dc.events.b4EndDrag) {
dc.b4EndDrag(e);
dc.fireEvent('b4EndDragEvent', { e: e });
}
if (dc.events.endDrag) {
dc.endDrag(e);
dc.fireEvent('endDragEvent', { e: e });
}
}
if (dc.events.mouseUp) {
dc.onMouseUp(e);
dc.fireEvent('mouseUpEvent', { e: e });
}
}
if (this._shimActive) {
this._deactivateShim();
if (this.dragCurrent && this.dragCurrent.useShim) {
this.useShim = this._shimState;
this._shimState = false;
}
}
this.dragCurrent = null;
this.dragOvers = {};
},
/**
* Internal function to handle the mousemove event. Will be invoked
* from the context of the html element.
*
* @TODO figure out what we can do about mouse events lost when the
* user drags objects beyond the window boundary. Currently we can
* detect this in internet explorer by verifying that the mouse is
* down during the mousemove event. Firefox doesn't give us the
* button state on the mousemove event.
* @method handleMouseMove
* @param {Event} e the event
* @private
* @static
*/
handleMouseMove: function(e) {
var dc = this.dragCurrent;
if (dc) {
// var button = e.which || e.button;
// check for IE mouseup outside of page boundary
// changed if condition from pega.util.Event.isIE to pega.env.ua.ie > 0 && pega.env.ua.ie < 9
// http://yuilibrary.com/projects/yui2/ticket/2529136
if ((pega.env.ua.ie > 0 && pega.env.ua.ie < 9)&& !e.button) {
this.stopEvent(e);
return this.handleMouseUp(e);
} else {
if (e.clientX < 0 || e.clientY < 0) {
//This will stop the element from leaving the viewport in FF, Opera & Safari
//Not turned on yet
//this.stopEvent(e);
//return false;
}
}
if (!this.dragThreshMet) {
var diffX = Math.abs(this.startX - pega.util.Event.getPageX(e));
var diffY = Math.abs(this.startY - pega.util.Event.getPageY(e));
if (diffX > this.clickPixelThresh ||
diffY > this.clickPixelThresh) {
this.startDrag(this.startX, this.startY);
}
}
if (this.dragThreshMet) {
if (dc && dc.events.b4Drag) {
dc.b4Drag(e);
dc.fireEvent('b4DragEvent', { e: e});
}
if (dc && dc.events.drag) {
dc.onDrag(e);
dc.fireEvent('dragEvent', { e: e});
}
if (dc) {
this.fireEvents(e, false);
}
}
this.stopEvent(e);
}
},
/**
* Iterates over all of the DragDrop elements to find ones we are
* hovering over or dropping on
* @method fireEvents
* @param {Event} e the event
* @param {boolean} isDrop is this a drop op or a mouseover op?
* @private
* @static
*/
fireEvents: function(e, isDrop) {
var dc = this.dragCurrent;
// If the user did the mouse up outside of the window, we could
// get here even though we have ended the drag.
// If the config option dragOnly is true, bail out and don't fire the events
if (!dc || dc.isLocked() || dc.dragOnly) {
return;
}
var x = pega.util.Event.getPageX(e),
y = pega.util.Event.getPageY(e),
pt = new pega.util.Point(x,y),
pos = dc.getTargetCoord(pt.x, pt.y),
el = dc.getDragEl(),
events = ['out', 'over', 'drop', 'enter'],
curRegion = new pega.util.Region( pos.y,
pos.x + el.offsetWidth,
pos.y + el.offsetHeight,
pos.x ),
oldOvers = [], // cache the previous dragOver array
inGroupsObj = {},
inGroups = [],
data = {
outEvts: [],
overEvts: [],
dropEvts: [],
enterEvts: []
};
// Check to see if the object(s) we were hovering over is no longer
// being hovered over so we can fire the onDragOut event
for (var i in this.dragOvers) {
var ddo = this.dragOvers[i];
if (! this.isTypeOfDD(ddo)) {
continue;
}
if (! this.isOverTarget(pt, ddo, this.mode, curRegion)) {
data.outEvts.push( ddo );
}
oldOvers[i] = true;
delete this.dragOvers[i];
}
for (var sGroup in dc.groups) {
if ("string" != typeof sGroup) {
continue;
}
for (i in this.ids[sGroup]) {
var oDD = this.ids[sGroup][i];
if (! this.isTypeOfDD(oDD)) {
continue;
}
if (oDD.isTarget && !oDD.isLocked() && oDD != dc) {
if (this.isOverTarget(pt, oDD, this.mode, curRegion)) {
inGroupsObj[sGroup] = true;
// look for drop interactions
if (isDrop) {
data.dropEvts.push( oDD );
// look for drag enter and drag over interactions
} else {
// initial drag over: dragEnter fires
if (!oldOvers[oDD.id]) {
data.enterEvts.push( oDD );
// subsequent drag overs: dragOver fires
} else {
data.overEvts.push( oDD );
}
this.dragOvers[oDD.id] = oDD;
}
}
}
}
}
this.interactionInfo = {
out: data.outEvts,
enter: data.enterEvts,
over: data.overEvts,
drop: data.dropEvts,
point: pt,
draggedRegion: curRegion,
sourceRegion: this.locationCache[dc.id],
validDrop: isDrop
};
for (var inG in inGroupsObj) {
inGroups.push(inG);
}
// notify about a drop that did not find a target
if (isDrop && !data.dropEvts.length) {
this.interactionInfo.validDrop = false;
if (dc.events.invalidDrop) {
dc.onInvalidDrop(e);
dc.fireEvent('invalidDropEvent', { e: e });
}
}
for (i = 0; i < events.length; i++) {
var tmp = null;
if (data[events[i] + 'Evts']) {
tmp = data[events[i] + 'Evts'];
}
if (tmp && tmp.length) {
var type = events[i].charAt(0).toUpperCase() + events[i].substr(1),
ev = 'onDrag' + type,
b4 = 'b4Drag' + type,
cev = 'drag' + type + 'Event',
check = 'drag' + type;
if (this.mode) {
if (dc.events[b4]) {
dc[b4](e, tmp, inGroups);
dc.fireEvent(b4 + 'Event', { event: e, info: tmp, group: inGroups });
}
if (dc.events[check]) {
dc[ev](e, tmp, inGroups);
dc.fireEvent(cev, { event: e, info: tmp, group: inGroups });
}
} else {
for (var b = 0, len = tmp.length; b < len; ++b) {
if (dc.events[b4]) {
dc[b4](e, tmp[b].id, inGroups[0]);
dc.fireEvent(b4 + 'Event', { event: e, info: tmp[b].id, group: inGroups[0] });
}
if (dc.events[check]) {
dc[ev](e, tmp[b].id, inGroups[0]);
dc.fireEvent(cev, { event: e, info: tmp[b].id, group: inGroups[0] });
}
}
}
}
}
},
/**
* Helper function for getting the best match from the list of drag
* and drop objects returned by the drag and drop events when we are
* in INTERSECT mode. It returns either the first object that the
* cursor is over, or the object that has the greatest overlap with
* the dragged element.
* @method getBestMatch
* @param {DragDrop[]} dds The array of drag and drop objects
* targeted
* @return {DragDrop} The best single match
* @static
*/
getBestMatch: function(dds) {
var winner = null;
var len = dds.length;
if (len == 1) {
winner = dds[0];
} else {
// Loop through the targeted items
for (var i=0; i<len; ++i) {
var dd = dds[i];
// If the cursor is over the object, it wins. If the
// cursor is over multiple matches, the first one we come
// to wins.
if (this.mode == this.INTERSECT && dd.cursorIsOver) {
winner = dd;
break;
// Otherwise the object with the most overlap wins
} else {
if (!winner || !winner.overlap || (dd.overlap &&
winner.overlap.getArea() < dd.overlap.getArea())) {
winner = dd;
}
}
}
}
return winner;
},
/**
* Refreshes the cache of the top-left and bottom-right points of the
* drag and drop objects in the specified group(s). This is in the
* format that is stored in the drag and drop instance, so typical
* usage is:
* <code>
* pega.util.DragDropMgr.refreshCache(ddinstance.groups);
* </code>