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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/Control.js
* @requires OpenLayers/Handler/Drag.js
*/
/**
* Class: OpenLayers.Control.DragPan
* The DragPan control pans the map with a drag of the mouse.
*
* Inherits from:
* - <OpenLayers.Control>
*/
OpenLayers.Control.DragPan = OpenLayers.Class(OpenLayers.Control, {
/**
* Property: type
* {OpenLayers.Control.TYPES}
*/
type: OpenLayers.Control.TYPE_TOOL,
/**
* Property: panned
* {Boolean} The map moved.
*/
panned: false,
/**
* Property: interval
* {Integer} The number of milliseconds that should ellapse before
* panning the map again. Defaults to 0 milliseconds, which means that
* no separate cycle is used for panning. In most cases you won't want
* to change this value. For slow machines/devices larger values can be
* tried out.
*/
interval: 0,
/**
* APIProperty: documentDrag
* {Boolean} If set to true, mouse dragging will continue even if the
* mouse cursor leaves the map viewport. Default is false.
*/
documentDrag: false,
/**
* Property: kinetic
* {<OpenLayers.Kinetic>} The OpenLayers.Kinetic object.
*/
kinetic: null,
/**
* APIProperty: enableKinetic
* {Boolean} Set this option to enable "kinetic dragging". Can be
* set to true or to an object. If set to an object this
* object will be passed to the {<OpenLayers.Kinetic>}
* constructor. Defaults to true.
* To get kinetic dragging, ensure that OpenLayers/Kinetic.js is
* included in your build config.
*/
enableKinetic: true,
/**
* APIProperty: kineticInterval
* {Integer} Interval in milliseconds between 2 steps in the "kinetic
* scrolling". Applies only if enableKinetic is set. Defaults
* to 10 milliseconds.
*/
kineticInterval: 10,
/**
* Method: draw
* Creates a Drag handler, using <panMap> and
* <panMapDone> as callbacks.
*/
draw: function() {
if (this.enableKinetic && OpenLayers.Kinetic) {
var config = {interval: this.kineticInterval};
if(typeof this.enableKinetic === "object") {
config = OpenLayers.Util.extend(config, this.enableKinetic);
}
this.kinetic = new OpenLayers.Kinetic(config);
}
this.handler = new OpenLayers.Handler.Drag(this, {
"move": this.panMap,
"done": this.panMapDone,
"down": this.panMapStart
}, {
interval: this.interval,
documentDrag: this.documentDrag
}
);
},
/**
* Method: panMapStart
*/
panMapStart: function() {
if(this.kinetic) {
this.kinetic.begin();
}
},
/**
* Method: panMap
*
* Parameters:
* xy - {<OpenLayers.Pixel>} Pixel of the mouse position
*/
panMap: function(xy) {
if(this.kinetic) {
this.kinetic.update(xy);
}
this.panned = true;
this.map.pan(
this.handler.last.x - xy.x,
this.handler.last.y - xy.y,
{dragging: true, animate: false}
);
},
/**
* Method: panMapDone
* Finish the panning operation. Only call setCenter (through <panMap>)
* if the map has actually been moved.
*
* Parameters:
* xy - {<OpenLayers.Pixel>} Pixel of the mouse position
*/
panMapDone: function(xy) {
if(this.panned) {
var res = null;
if (this.kinetic) {
res = this.kinetic.end(xy);
}
this.map.pan(
this.handler.last.x - xy.x,
this.handler.last.y - xy.y,
{dragging: !!res, animate: false}
);
if (res) {
var self = this;
this.kinetic.move(res, function(x, y, end) {
self.map.pan(x, y, {dragging: !end, animate: false});
});
}
this.panned = false;
}
},
CLASS_NAME: "OpenLayers.Control.DragPan"
});