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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/Feature/Vector.js
* @requires OpenLayers/Handler/Feature.js
* @requires OpenLayers/Layer/Vector/RootContainer.js
*/
/**
* Class: OpenLayers.Control.SelectFeature
* The SelectFeature control selects vector features from a given layer on
* click or hover.
*
* Inherits from:
* - <OpenLayers.Control>
*/
OpenLayers.Control.SelectFeature = OpenLayers.Class(OpenLayers.Control, {
/**
* APIProperty: events
* {<OpenLayers.Events>} Events instance for listeners and triggering
* control specific events.
*
* Register a listener for a particular event with the following syntax:
* (code)
* control.events.register(type, obj, listener);
* (end)
*
* Supported event types (in addition to those from <OpenLayers.Control.events>):
* beforefeaturehighlighted - Triggered before a feature is highlighted
* featurehighlighted - Triggered when a feature is highlighted
* featureunhighlighted - Triggered when a feature is unhighlighted
* boxselectionstart - Triggered before box selection starts
* boxselectionend - Triggered after box selection ends
*/
/**
* Property: multipleKey
* {String} An event modifier ('altKey' or 'shiftKey') that temporarily sets
* the <multiple> property to true. Default is null.
*/
multipleKey: null,
/**
* Property: toggleKey
* {String} An event modifier ('altKey' or 'shiftKey') that temporarily sets
* the <toggle> property to true. Default is null.
*/
toggleKey: null,
/**
* APIProperty: multiple
* {Boolean} Allow selection of multiple geometries. Default is false.
*/
multiple: false,
/**
* APIProperty: clickout
* {Boolean} Unselect features when clicking outside any feature.
* Default is true.
*/
clickout: true,
/**
* APIProperty: toggle
* {Boolean} Unselect a selected feature on click. Default is false. Only
* has meaning if hover is false.
*/
toggle: false,
/**
* APIProperty: hover
* {Boolean} Select on mouse over and deselect on mouse out. If true, this
* ignores clicks and only listens to mouse moves.
*/
hover: false,
/**
* APIProperty: highlightOnly
* {Boolean} If true do not actually select features (that is place them in
* the layer's selected features array), just highlight them. This property
* has no effect if hover is false. Defaults to false.
*/
highlightOnly: false,
/**
* APIProperty: box
* {Boolean} Allow feature selection by drawing a box.
*/
box: false,
/**
* Property: onBeforeSelect
* {Function} Optional function to be called before a feature is selected.
* The function should expect to be called with a feature.
*/
onBeforeSelect: function() {},
/**
* APIProperty: onSelect
* {Function} Optional function to be called when a feature is selected.
* The function should expect to be called with a feature.
*/
onSelect: function() {},
/**
* APIProperty: onUnselect
* {Function} Optional function to be called when a feature is unselected.
* The function should expect to be called with a feature.
*/
onUnselect: function() {},
/**
* Property: scope
* {Object} The scope to use with the onBeforeSelect, onSelect, onUnselect
* callbacks. If null the scope will be this control.
*/
scope: null,
/**
* APIProperty: geometryTypes
* {Array(String)} To restrict selecting to a limited set of geometry types,
* send a list of strings corresponding to the geometry class names.
*/
geometryTypes: null,
/**
* Property: layer
* {<OpenLayers.Layer.Vector>} The vector layer with a common renderer
* root for all layers this control is configured with (if an array of
* layers was passed to the constructor), or the vector layer the control
* was configured with (if a single layer was passed to the constructor).
*/
layer: null,
/**
* Property: layers
* {Array(<OpenLayers.Layer.Vector>)} The layers this control will work on,
* or null if the control was configured with a single layer
*/
layers: null,
/**
* APIProperty: callbacks
* {Object} The functions that are sent to the handlers.feature for callback
*/
callbacks: null,
/**
* APIProperty: selectStyle
* {Object} Hash of styles
*/
selectStyle: null,
/**
* Property: renderIntent
* {String} key used to retrieve the select style from the layer's
* style map.
*/
renderIntent: "select",
/**
* Property: handlers
* {Object} Object with references to multiple <OpenLayers.Handler>
* instances.
*/
handlers: null,
/**
* Constructor: OpenLayers.Control.SelectFeature
* Create a new control for selecting features.
*
* Parameters:
* layers - {<OpenLayers.Layer.Vector>}, or an array of vector layers. The
* layer(s) this control will select features from.
* options - {Object}
*/
initialize: function(layers, options) {
OpenLayers.Control.prototype.initialize.apply(this, [options]);
if(this.scope === null) {
this.scope = this;
}
this.initLayer(layers);
var callbacks = {
click: this.clickFeature,
clickout: this.clickoutFeature
};
if (this.hover) {
callbacks.over = this.overFeature;
callbacks.out = this.outFeature;
}
this.callbacks = OpenLayers.Util.extend(callbacks, this.callbacks);
this.handlers = {
feature: new OpenLayers.Handler.Feature(
this, this.layer, this.callbacks,
{geometryTypes: this.geometryTypes}
)
};
if (this.box) {
this.handlers.box = new OpenLayers.Handler.Box(
this, {done: this.selectBox},
{boxDivClassName: "olHandlerBoxSelectFeature"}
);
}
},
/**
* Method: initLayer
* Assign the layer property. If layers is an array, we need to use
* a RootContainer.
*
* Parameters:
* layers - {<OpenLayers.Layer.Vector>}, or an array of vector layers.
*/
initLayer: function(layers) {
if(OpenLayers.Util.isArray(layers)) {
this.layers = layers;
this.layer = new OpenLayers.Layer.Vector.RootContainer(
this.id + "_container", {
layers: layers
}
);
} else {
this.layer = layers;
}
},
/**
* Method: destroy
*/
destroy: function() {
if(this.active && this.layers) {
this.map.removeLayer(this.layer);
}
OpenLayers.Control.prototype.destroy.apply(this, arguments);
if(this.layers) {
this.layer.destroy();
}
},
/**
* Method: activate
* Activates the control.
*
* Returns:
* {Boolean} The control was effectively activated.
*/
activate: function () {
if (!this.active) {
if(this.layers) {
this.map.addLayer(this.layer);
}
this.handlers.feature.activate();
if(this.box && this.handlers.box) {
this.handlers.box.activate();
}
}
return OpenLayers.Control.prototype.activate.apply(
this, arguments
);
},
/**
* Method: deactivate
* Deactivates the control.
*
* Returns:
* {Boolean} The control was effectively deactivated.
*/
deactivate: function () {
if (this.active) {
this.handlers.feature.deactivate();
if(this.handlers.box) {
this.handlers.box.deactivate();
}
if(this.layers) {
this.map.removeLayer(this.layer);
}
}
return OpenLayers.Control.prototype.deactivate.apply(
this, arguments
);
},
/**
* Method: unselectAll
* Unselect all selected features. To unselect all except for a single
* feature, set the options.except property to the feature.
*
* Parameters:
* options - {Object} Optional configuration object.
*/
unselectAll: function(options) {
// we'll want an option to supress notification here
var layers = this.layers || [this.layer],
layer, feature, l, numExcept;
for(l=0; l<layers.length; ++l) {
layer = layers[l];
numExcept = 0;
//layer.selectedFeatures is null when layer is destroyed and
//one of it's preremovelayer listener calls setLayer
//with another layer on this control
if(layer.selectedFeatures != null) {
while(layer.selectedFeatures.length > numExcept) {
feature = layer.selectedFeatures[numExcept];
if(!options || options.except != feature) {
this.unselect(feature);
} else {
++numExcept;
}
}
}
}
},
/**
* Method: clickFeature
* Called on click in a feature
* Only responds if this.hover is false.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
clickFeature: function(feature) {
if(!this.hover) {
var selected = (OpenLayers.Util.indexOf(
feature.layer.selectedFeatures, feature) > -1);
if(selected) {
if(this.toggleSelect()) {
this.unselect(feature);
} else if(!this.multipleSelect()) {
this.unselectAll({except: feature});
}
} else {
if(!this.multipleSelect()) {
this.unselectAll({except: feature});
}
this.select(feature);
}
}
},
/**
* Method: multipleSelect
* Allow for multiple selected features based on <multiple> property and
* <multipleKey> event modifier.
*
* Returns:
* {Boolean} Allow for multiple selected features.
*/
multipleSelect: function() {
return this.multiple || (this.handlers.feature.evt &&
this.handlers.feature.evt[this.multipleKey]);
},
/**
* Method: toggleSelect
* Event should toggle the selected state of a feature based on <toggle>
* property and <toggleKey> event modifier.
*
* Returns:
* {Boolean} Toggle the selected state of a feature.
*/
toggleSelect: function() {
return this.toggle || (this.handlers.feature.evt &&
this.handlers.feature.evt[this.toggleKey]);
},
/**
* Method: clickoutFeature
* Called on click outside a previously clicked (selected) feature.
* Only responds if this.hover is false.
*
* Parameters:
* feature - {<OpenLayers.Vector.Feature>}
*/
clickoutFeature: function(feature) {
if(!this.hover && this.clickout) {
this.unselectAll();
}
},
/**
* Method: overFeature
* Called on over a feature.
* Only responds if this.hover is true.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
overFeature: function(feature) {
var layer = feature.layer;
if(this.hover) {
if(this.highlightOnly) {
this.highlight(feature);
} else if(OpenLayers.Util.indexOf(
layer.selectedFeatures, feature) == -1) {
this.select(feature);
}
}
},
/**
* Method: outFeature
* Called on out of a selected feature.
* Only responds if this.hover is true.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
outFeature: function(feature) {
if(this.hover) {
if(this.highlightOnly) {
// we do nothing if we're not the last highlighter of the
// feature
if(feature._lastHighlighter == this.id) {
// if another select control had highlighted the feature before
// we did it ourself then we use that control to highlight the
// feature as it was before we highlighted it, else we just
// unhighlight it
if(feature._prevHighlighter &&
feature._prevHighlighter != this.id) {
delete feature._lastHighlighter;
var control = this.map.getControl(
feature._prevHighlighter);
if(control) {
control.highlight(feature);
}
} else {
this.unhighlight(feature);
}
}
} else {
this.unselect(feature);
}
}
},
/**
* Method: highlight
* Redraw feature with the select style.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
highlight: function(feature) {
var layer = feature.layer;
var cont = this.events.triggerEvent("beforefeaturehighlighted", {
feature : feature
});
if(cont !== false) {
feature._prevHighlighter = feature._lastHighlighter;
feature._lastHighlighter = this.id;
var style = this.selectStyle || this.renderIntent;
layer.drawFeature(feature, style);
this.events.triggerEvent("featurehighlighted", {feature : feature});
}
},
/**
* Method: unhighlight
* Redraw feature with the "default" style
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
unhighlight: function(feature) {
var layer = feature.layer;
// three cases:
// 1. there's no other highlighter, in that case _prev is undefined,
// and we just need to undef _last
// 2. another control highlighted the feature after we did it, in
// that case _last references this other control, and we just
// need to undef _prev
// 3. another control highlighted the feature before we did it, in
// that case _prev references this other control, and we need to
// set _last to _prev and undef _prev
if(feature._prevHighlighter == undefined) {
delete feature._lastHighlighter;
} else if(feature._prevHighlighter == this.id) {
delete feature._prevHighlighter;
} else {
feature._lastHighlighter = feature._prevHighlighter;
delete feature._prevHighlighter;
}
layer.drawFeature(feature, feature.style || feature.layer.style ||
"default");
this.events.triggerEvent("featureunhighlighted", {feature : feature});
},
/**
* Method: select
* Add feature to the layer's selectedFeature array, render the feature as
* selected, and call the onSelect function.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
select: function(feature) {
var cont = this.onBeforeSelect.call(this.scope, feature);
var layer = feature.layer;
if(cont !== false) {
cont = layer.events.triggerEvent("beforefeatureselected", {
feature: feature
});
if(cont !== false) {
layer.selectedFeatures.push(feature);
this.highlight(feature);
// if the feature handler isn't involved in the feature
// selection (because the box handler is used or the
// feature is selected programatically) we fake the
// feature handler to allow unselecting on click
if(!this.handlers.feature.lastFeature) {
this.handlers.feature.lastFeature = layer.selectedFeatures[0];
}
layer.events.triggerEvent("featureselected", {feature: feature});
this.onSelect.call(this.scope, feature);
}
}
},
/**
* Method: unselect
* Remove feature from the layer's selectedFeature array, render the feature as
* normal, and call the onUnselect function.
*
* Parameters:
* feature - {<OpenLayers.Feature.Vector>}
*/
unselect: function(feature) {
var layer = feature.layer;
// Store feature style for restoration later
this.unhighlight(feature);
OpenLayers.Util.removeItem(layer.selectedFeatures, feature);
layer.events.triggerEvent("featureunselected", {feature: feature});
this.onUnselect.call(this.scope, feature);
},
/**
* Method: selectBox
* Callback from the handlers.box set up when <box> selection is true
* on.
*
* Parameters:
* position - {<OpenLayers.Bounds> || <OpenLayers.Pixel> }
*/
selectBox: function(position) {
if (position instanceof OpenLayers.Bounds) {
var minXY = this.map.getLonLatFromPixel({
x: position.left,
y: position.bottom
});
var maxXY = this.map.getLonLatFromPixel({
x: position.right,
y: position.top
});
var bounds = new OpenLayers.Bounds(
minXY.lon, minXY.lat, maxXY.lon, maxXY.lat
);
// if multiple is false, first deselect currently selected features
if (!this.multipleSelect()) {
this.unselectAll();
}
// because we're using a box, we consider we want multiple selection
var prevMultiple = this.multiple;
this.multiple = true;
var layers = this.layers || [this.layer];
this.events.triggerEvent("boxselectionstart", {layers: layers});
var layer;
for(var l=0; l<layers.length; ++l) {
layer = layers[l];
for(var i=0, len = layer.features.length; i<len; ++i) {
var feature = layer.features[i];
// check if the feature is displayed
if (!feature.getVisibility()) {
continue;
}
if (this.geometryTypes == null || OpenLayers.Util.indexOf(
this.geometryTypes, feature.geometry.CLASS_NAME) > -1) {
if (bounds.toGeometry().intersects(feature.geometry)) {
if (OpenLayers.Util.indexOf(layer.selectedFeatures, feature) == -1) {
this.select(feature);
}
}
}
}
}
this.multiple = prevMultiple;
this.events.triggerEvent("boxselectionend", {layers: layers});
}
},
/**
* Method: setMap
* Set the map property for the control.
*
* Parameters:
* map - {<OpenLayers.Map>}
*/
setMap: function(map) {
this.handlers.feature.setMap(map);
if (this.box) {
this.handlers.box.setMap(map);
}
OpenLayers.Control.prototype.setMap.apply(this, arguments);
},
/**
* APIMethod: setLayer
* Attach a new layer to the control, overriding any existing layers.
*
* Parameters:
* layers - Array of {<OpenLayers.Layer.Vector>} or a single
* {<OpenLayers.Layer.Vector>}
*/
setLayer: function(layers) {
var isActive = this.active;
this.unselectAll();
this.deactivate();
if(this.layers) {
this.layer.destroy();
this.layers = null;
}
this.initLayer(layers);
this.handlers.feature.layer = this.layer;
if (isActive) {
this.activate();
}
},
CLASS_NAME: "OpenLayers.Control.SelectFeature"
});