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path: root/misc/openlayers/lib/OpenLayers/Handler/Drag.js
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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"
+});
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