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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
* @requires OpenLayers/Handler/Feature.js
*/
/**
* Class: OpenLayers.Control.DragFeature
* The DragFeature control moves a feature with a drag of the mouse. Create a
* new control with the <OpenLayers.Control.DragFeature> constructor.
*
* Inherits From:
* - <OpenLayers.Control>
*/
OpenLayers.Control.DragFeature = OpenLayers.Class(OpenLayers.Control, {
/**
* APIProperty: geometryTypes
* {Array(String)} To restrict dragging to a limited set of geometry types,
* send a list of strings corresponding to the geometry class names.
*/
geometryTypes: null,
/**
* APIProperty: onStart
* {Function} Define this function if you want to know when a drag starts.
* The function should expect to receive two arguments: the feature
* that is about to be dragged and the pixel location of the mouse.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The feature that is about to be
* dragged.
* pixel - {<OpenLayers.Pixel>} The pixel location of the mouse.
*/
onStart: function(feature, pixel) {},
/**
* APIProperty: onDrag
* {Function} Define this function if you want to know about each move of a
* feature. The function should expect to receive two arguments: the
* feature that is being dragged and the pixel location of the mouse.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The feature that was dragged.
* pixel - {<OpenLayers.Pixel>} The pixel location of the mouse.
*/
onDrag: function(feature, pixel) {},
/**
* APIProperty: onComplete
* {Function} Define this function if you want to know when a feature is
* done dragging. The function should expect to receive two arguments:
* the feature that is being dragged and the pixel location of the
* mouse.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The feature that was dragged.
* pixel - {<OpenLayers.Pixel>} The pixel location of the mouse.
*/
onComplete: function(feature, pixel) {},
/**
* APIProperty: onEnter
* {Function} Define this function if you want to know when the mouse
* goes over a feature and thereby makes this feature a candidate
* for dragging.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The feature that is ready
* to be dragged.
*/
onEnter: function(feature) {},
/**
* APIProperty: onLeave
* {Function} Define this function if you want to know when the mouse
* goes out of the feature that was dragged.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The feature that was dragged.
*/
onLeave: function(feature) {},
/**
* 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: layer
* {<OpenLayers.Layer.Vector>}
*/
layer: null,
/**
* Property: feature
* {<OpenLayers.Feature.Vector>}
*/
feature: null,
/**
* Property: dragCallbacks
* {Object} The functions that are sent to the drag handler for callback.
*/
dragCallbacks: {},
/**
* Property: featureCallbacks
* {Object} The functions that are sent to the feature handler for callback.
*/
featureCallbacks: {},
/**
* Property: lastPixel
* {<OpenLayers.Pixel>}
*/
lastPixel: null,
/**
* Constructor: OpenLayers.Control.DragFeature
* Create a new control to drag features.
*
* Parameters:
* layer - {<OpenLayers.Layer.Vector>} The layer containing features to be
* dragged.
* options - {Object} Optional object whose properties will be set on the
* control.
*/
initialize: function(layer, options) {
OpenLayers.Control.prototype.initialize.apply(this, [options]);
this.layer = layer;
this.handlers = {
drag: new OpenLayers.Handler.Drag(
this, OpenLayers.Util.extend({
down: this.downFeature,
move: this.moveFeature,
up: this.upFeature,
out: this.cancel,
done: this.doneDragging
}, this.dragCallbacks), {
documentDrag: this.documentDrag
}
),
feature: new OpenLayers.Handler.Feature(
this, this.layer, OpenLayers.Util.extend({
// 'click' and 'clickout' callback are for the mobile
// support: no 'over' or 'out' in touch based browsers.
click: this.clickFeature,
clickout: this.clickoutFeature,
over: this.overFeature,
out: this.outFeature
}, this.featureCallbacks),
{geometryTypes: this.geometryTypes}
)
};
},
/**
* Method: clickFeature
* Called when the feature handler detects a click-in on a feature.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
clickFeature: function(feature) {
if (this.handlers.feature.touch && !this.over && this.overFeature(feature)) {
this.handlers.drag.dragstart(this.handlers.feature.evt);
// to let the events propagate to the feature handler (click callback)
this.handlers.drag.stopDown = false;
}
},
/**
* Method: clickoutFeature
* Called when the feature handler detects a click-out on a feature.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
clickoutFeature: function(feature) {
if (this.handlers.feature.touch && this.over) {
this.outFeature(feature);
this.handlers.drag.stopDown = true;
}
},
/**
* APIMethod: destroy
* Take care of things that are not handled in superclass
*/
destroy: function() {
this.layer = null;
OpenLayers.Control.prototype.destroy.apply(this, []);
},
/**
* APIMethod: activate
* Activate the control and the feature handler.
*
* Returns:
* {Boolean} Successfully activated the control and feature handler.
*/
activate: function() {
return (this.handlers.feature.activate() &&
OpenLayers.Control.prototype.activate.apply(this, arguments));
},
/**
* APIMethod: deactivate
* Deactivate the control and all handlers.
*
* Returns:
* {Boolean} Successfully deactivated the control.
*/
deactivate: function() {
// the return from the handlers is unimportant in this case
this.handlers.drag.deactivate();
this.handlers.feature.deactivate();
this.feature = null;
this.dragging = false;
this.lastPixel = null;
OpenLayers.Element.removeClass(
this.map.viewPortDiv, this.displayClass + "Over"
);
return OpenLayers.Control.prototype.deactivate.apply(this, arguments);
},
/**
* Method: overFeature
* Called when the feature handler detects a mouse-over on a feature.
* This activates the drag handler.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The selected feature.
*
* Returns:
* {Boolean} Successfully activated the drag handler.
*/
overFeature: function(feature) {
var activated = false;
if(!this.handlers.drag.dragging) {
this.feature = feature;
this.handlers.drag.activate();
activated = true;
this.over = true;
OpenLayers.Element.addClass(this.map.viewPortDiv, this.displayClass + "Over");
this.onEnter(feature);
} else {
if(this.feature.id == feature.id) {
this.over = true;
} else {
this.over = false;
}
}
return activated;
},
/**
* Method: downFeature
* Called when the drag handler detects a mouse-down.
*
* Parameters:
* pixel - {<OpenLayers.Pixel>} Location of the mouse event.
*/
downFeature: function(pixel) {
this.lastPixel = pixel;
this.onStart(this.feature, pixel);
},
/**
* Method: moveFeature
* Called when the drag handler detects a mouse-move. Also calls the
* optional onDrag method.
*
* Parameters:
* pixel - {<OpenLayers.Pixel>} Location of the mouse event.
*/
moveFeature: function(pixel) {
var res = this.map.getResolution();
this.feature.geometry.move(res * (pixel.x - this.lastPixel.x),
res * (this.lastPixel.y - pixel.y));
this.layer.drawFeature(this.feature);
this.lastPixel = pixel;
this.onDrag(this.feature, pixel);
},
/**
* Method: upFeature
* Called when the drag handler detects a mouse-up.
*
* Parameters:
* pixel - {<OpenLayers.Pixel>} Location of the mouse event.
*/
upFeature: function(pixel) {
if(!this.over) {
this.handlers.drag.deactivate();
}
},
/**
* Method: doneDragging
* Called when the drag handler is done dragging.
*
* Parameters:
* pixel - {<OpenLayers.Pixel>} The last event pixel location. If this event
* came from a mouseout, this may not be in the map viewport.
*/
doneDragging: function(pixel) {
this.onComplete(this.feature, pixel);
},
/**
* Method: outFeature
* Called when the feature handler detects a mouse-out on a feature.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>} The feature that the mouse left.
*/
outFeature: function(feature) {
if(!this.handlers.drag.dragging) {
this.over = false;
this.handlers.drag.deactivate();
OpenLayers.Element.removeClass(
this.map.viewPortDiv, this.displayClass + "Over"
);
this.onLeave(feature);
this.feature = null;
} else {
if(this.feature.id == feature.id) {
this.over = false;
}
}
},
/**
* Method: cancel
* Called when the drag handler detects a mouse-out (from the map viewport).
*/
cancel: function() {
this.handlers.drag.deactivate();
this.over = false;
},
/**
* Method: setMap
* Set the map property for the control and all handlers.
*
* Parameters:
* map - {<OpenLayers.Map>} The control's map.
*/
setMap: function(map) {
this.handlers.drag.setMap(map);
this.handlers.feature.setMap(map);
OpenLayers.Control.prototype.setMap.apply(this, arguments);
},
CLASS_NAME: "OpenLayers.Control.DragFeature"
});