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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/Handler.js
*/
/**
* Class: OpenLayers.Handler.Drag
* The drag handler is used to deal with sequences of browser events related
* to dragging. The handler is used by controls that want to know when
* a drag sequence begins, when a drag is happening, and when it has
* finished.
*
* Controls that use the drag handler typically construct it with callbacks
* for 'down', 'move', and 'done'. Callbacks for these keys are called
* when the drag begins, with each move, and when the drag is done. In
* addition, controls can have callbacks keyed to 'up' and 'out' if they
* care to differentiate between the types of events that correspond with
* the end of a drag sequence. If no drag actually occurs (no mouse move)
* the 'down' and 'up' callbacks will be called, but not the 'done'
* callback.
*
* Create a new drag handler with the <OpenLayers.Handler.Drag> constructor.
*
* Inherits from:
* - <OpenLayers.Handler>
*/
OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
/**
* Property: started
* {Boolean} When a mousedown or touchstart event is received, we want to
* record it, but not set 'dragging' until the mouse moves after starting.
*/
started: false,
/**
* Property: stopDown
* {Boolean} Stop propagation of mousedown events from getting to listeners
* on the same element. Default is true.
*/
stopDown: true,
/**
* Property: dragging
* {Boolean}
*/
dragging: false,
/**
* Property: last
* {<OpenLayers.Pixel>} The last pixel location of the drag.
*/
last: null,
/**
* Property: start
* {<OpenLayers.Pixel>} The first pixel location of the drag.
*/
start: null,
/**
* Property: lastMoveEvt
* {Object} The last mousemove event that occurred. Used to
* position the map correctly when our "delay drag"
* timeout expired.
*/
lastMoveEvt: null,
/**
* Property: oldOnselectstart
* {Function}
*/
oldOnselectstart: null,
/**
* Property: interval
* {Integer} In order to increase performance, an interval (in
* milliseconds) can be set to reduce the number of drag events
* called. If set, a new drag event will not be set until the
* interval has passed.
* Defaults to 0, meaning no interval.
*/
interval: 0,
/**
* Property: timeoutId
* {String} The id of the timeout used for the mousedown interval.
* This is "private", and should be left alone.
*/
timeoutId: null,
/**
* APIProperty: documentDrag
* {Boolean} If set to true, the handler will also handle mouse moves when
* the cursor has moved out of the map viewport. Default is false.
*/
documentDrag: false,
/**
* Property: documentEvents
* {Boolean} Are we currently observing document events?
*/
documentEvents: null,
/**
* Constructor: OpenLayers.Handler.Drag
* Returns OpenLayers.Handler.Drag
*
* Parameters:
* control - {<OpenLayers.Control>} The control that is making use of
* this handler. If a handler is being used without a control, the
* handlers setMap method must be overridden to deal properly with
* the map.
* callbacks - {Object} An object containing a single function to be
* called when the drag operation is finished. The callback should
* expect to recieve a single argument, the pixel location of the event.
* Callbacks for 'move' and 'done' are supported. You can also speficy
* callbacks for 'down', 'up', and 'out' to respond to those events.
* options - {Object}
*/
initialize: function(control, callbacks, options) {
OpenLayers.Handler.prototype.initialize.apply(this, arguments);
if (this.documentDrag === true) {
var me = this;
this._docMove = function(evt) {
me.mousemove({
xy: {x: evt.clientX, y: evt.clientY},
element: document
});
};
this._docUp = function(evt) {
me.mouseup({xy: {x: evt.clientX, y: evt.clientY}});
};
}
},
/**
* Method: dragstart
* This private method is factorized from mousedown and touchstart methods
*
* Parameters:
* evt - {Event} The event
*
* Returns:
* {Boolean} Let the event propagate.
*/
dragstart: function (evt) {
var propagate = true;
this.dragging = false;
if (this.checkModifiers(evt) &&
(OpenLayers.Event.isLeftClick(evt) ||
OpenLayers.Event.isSingleTouch(evt))) {
this.started = true;
this.start = evt.xy;
this.last = evt.xy;
OpenLayers.Element.addClass(
this.map.viewPortDiv, "olDragDown"
);
this.down(evt);
this.callback("down", [evt.xy]);
// prevent document dragging
OpenLayers.Event.preventDefault(evt);
if(!this.oldOnselectstart) {
this.oldOnselectstart = document.onselectstart ?
document.onselectstart : OpenLayers.Function.True;
}
document.onselectstart = OpenLayers.Function.False;
propagate = !this.stopDown;
} else {
this.started = false;
this.start = null;
this.last = null;
}
return propagate;
},
/**
* Method: dragmove
* This private method is factorized from mousemove and touchmove methods
*
* Parameters:
* evt - {Event} The event
*
* Returns:
* {Boolean} Let the event propagate.
*/
dragmove: function (evt) {
this.lastMoveEvt = evt;
if (this.started && !this.timeoutId && (evt.xy.x != this.last.x ||
evt.xy.y != this.last.y)) {
if(this.documentDrag === true && this.documentEvents) {
if(evt.element === document) {
this.adjustXY(evt);
// do setEvent manually because the documentEvents are not
// registered with the map
this.setEvent(evt);
} else {
this.removeDocumentEvents();
}
}
if (this.interval > 0) {
this.timeoutId = setTimeout(
OpenLayers.Function.bind(this.removeTimeout, this),
this.interval);
}
this.dragging = true;
this.move(evt);
this.callback("move", [evt.xy]);
if(!this.oldOnselectstart) {
this.oldOnselectstart = document.onselectstart;
document.onselectstart = OpenLayers.Function.False;
}
this.last = evt.xy;
}
return true;
},
/**
* Method: dragend
* This private method is factorized from mouseup and touchend methods
*
* Parameters:
* evt - {Event} The event
*
* Returns:
* {Boolean} Let the event propagate.
*/
dragend: function (evt) {
if (this.started) {
if(this.documentDrag === true && this.documentEvents) {
this.adjustXY(evt);
this.removeDocumentEvents();
}
var dragged = (this.start != this.last);
this.started = false;
this.dragging = false;
OpenLayers.Element.removeClass(
this.map.viewPortDiv, "olDragDown"
);
this.up(evt);
this.callback("up", [evt.xy]);
if(dragged) {
this.callback("done", [evt.xy]);
}
document.onselectstart = this.oldOnselectstart;
}
return true;
},
/**
* The four methods below (down, move, up, and out) are used by subclasses
* to do their own processing related to these mouse events.
*/
/**
* Method: down
* This method is called during the handling of the mouse down event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse down event
*/
down: function(evt) {
},
/**
* Method: move
* This method is called during the handling of the mouse move event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse move event
*
*/
move: function(evt) {
},
/**
* Method: up
* This method is called during the handling of the mouse up event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse up event
*/
up: function(evt) {
},
/**
* Method: out
* This method is called during the handling of the mouse out event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse out event
*/
out: function(evt) {
},
/**
* The methods below are part of the magic of event handling. Because
* they are named like browser events, they are registered as listeners
* for the events they represent.
*/
/**
* Method: mousedown
* Handle mousedown events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
mousedown: function(evt) {
return this.dragstart(evt);
},
/**
* Method: touchstart
* Handle touchstart events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
touchstart: function(evt) {
this.startTouch();
return this.dragstart(evt);
},
/**
* Method: mousemove
* Handle mousemove events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
mousemove: function(evt) {
return this.dragmove(evt);
},
/**
* Method: touchmove
* Handle touchmove events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
touchmove: function(evt) {
return this.dragmove(evt);
},
/**
* Method: removeTimeout
* Private. Called by mousemove() to remove the drag timeout.
*/
removeTimeout: function() {
this.timeoutId = null;
// if timeout expires while we're still dragging (mouseup
// hasn't occurred) then call mousemove to move to the
// correct position
if(this.dragging) {
this.mousemove(this.lastMoveEvt);
}
},
/**
* Method: mouseup
* Handle mouseup events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
mouseup: function(evt) {
return this.dragend(evt);
},
/**
* Method: touchend
* Handle touchend events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
touchend: function(evt) {
// override evt.xy with last position since touchend does not have
// any touch position
evt.xy = this.last;
return this.dragend(evt);
},
/**
* Method: mouseout
* Handle mouseout events
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
mouseout: function (evt) {
if (this.started && OpenLayers.Util.mouseLeft(evt, this.map.viewPortDiv)) {
if(this.documentDrag === true) {
this.addDocumentEvents();
} else {
var dragged = (this.start != this.last);
this.started = false;
this.dragging = false;
OpenLayers.Element.removeClass(
this.map.viewPortDiv, "olDragDown"
);
this.out(evt);
this.callback("out", []);
if(dragged) {
this.callback("done", [evt.xy]);
}
if(document.onselectstart) {
document.onselectstart = this.oldOnselectstart;
}
}
}
return true;
},
/**
* Method: click
* The drag handler captures the click event. If something else registers
* for clicks on the same element, its listener will not be called
* after a drag.
*
* Parameters:
* evt - {Event}
*
* Returns:
* {Boolean} Let the event propagate.
*/
click: function (evt) {
// let the click event propagate only if the mouse moved
return (this.start == this.last);
},
/**
* Method: activate
* Activate the handler.
*
* Returns:
* {Boolean} The handler was successfully activated.
*/
activate: function() {
var activated = false;
if(OpenLayers.Handler.prototype.activate.apply(this, arguments)) {
this.dragging = false;
activated = true;
}
return activated;
},
/**
* Method: deactivate
* Deactivate the handler.
*
* Returns:
* {Boolean} The handler was successfully deactivated.
*/
deactivate: function() {
var deactivated = false;
if(OpenLayers.Handler.prototype.deactivate.apply(this, arguments)) {
this.started = false;
this.dragging = false;
this.start = null;
this.last = null;
deactivated = true;
OpenLayers.Element.removeClass(
this.map.viewPortDiv, "olDragDown"
);
}
return deactivated;
},
/**
* Method: adjustXY
* Converts event coordinates that are relative to the document body to
* ones that are relative to the map viewport. The latter is the default in
* OpenLayers.
*
* Parameters:
* evt - {Object}
*/
adjustXY: function(evt) {
var pos = OpenLayers.Util.pagePosition(this.map.viewPortDiv);
evt.xy.x -= pos[0];
evt.xy.y -= pos[1];
},
/**
* Method: addDocumentEvents
* Start observing document events when documentDrag is true and the mouse
* cursor leaves the map viewport while dragging.
*/
addDocumentEvents: function() {
OpenLayers.Element.addClass(document.body, "olDragDown");
this.documentEvents = true;
OpenLayers.Event.observe(document, "mousemove", this._docMove);
OpenLayers.Event.observe(document, "mouseup", this._docUp);
},
/**
* Method: removeDocumentEvents
* Stops observing document events when documentDrag is true and the mouse
* cursor re-enters the map viewport while dragging.
*/
removeDocumentEvents: function() {
OpenLayers.Element.removeClass(document.body, "olDragDown");
this.documentEvents = false;
OpenLayers.Event.stopObserving(document, "mousemove", this._docMove);
OpenLayers.Event.stopObserving(document, "mouseup", this._docUp);
},
CLASS_NAME: "OpenLayers.Handler.Drag"
});