/*global define, esri, window, Snap, $, RAMP */
/**
*
*
* @module RAMP
* @submodule Map
*/
/**
* A class responsible for highlighting points, lines, and shapes on the map upon selection and consequent hover actions.
* The highlighting is achieved by manipulating svg rendering of the map as follows:
* - all existing feature layers are wrapped into a group object
* - three more group objects are created:
* - `highlight group` is positioned after the `graphicGroup`
* - `zoomlight group` is positioned before the `graphicGroup`
* - `hoverlight group` is positioned before the `zoomlight group`
*
* and changing the opacity of the `graphicGroup` while adding shapes to one or more of the additional group objects.
*
* @class FeatureHighlighter
* @static
* @uses dojo/_base/declare
* @uses dojo/topic
* @uses GlobalStorage
* @uses Map
* @uses EventManager
* @uses Util
* @uses Dictionary
*/
define([
/* Dojo */
"dojo/_base/declare", "dojo/topic",
/* Ramp */
"ramp/globalStorage", "ramp/map", "ramp/eventManager",
/* Util */
"utils/util", "utils/dictionary"
],
function (
/* Dojo */
declare, topic,
/* Ramp */
GlobalStorage, RampMap, EventManager,
/* Util*/
UtilMisc, UtilDict) {
"use strict";
var map,
config,
highlightLayer,
hoverlightLayer,
zoomlightLayer,
graphicGroup,
highlightedGraphic,
zoomlightGraphic;
/**
* Creates a copy of the given graphic object.
*
* @method cloneGraphic
* @private
* @param {Object} graphic Graphic object to clone
* @return clone A cloned Graphic object
*/
function cloneGraphic(graphic) {
// Figure out how large the image should be based on the
// shape or symbol object (which ever one exists)
var clone = new esri.Graphic({
geometry: graphic.geometry,
attributes: {}
});
clone.symbol = graphic.getLayer().renderer.getSymbol(graphic);
// Pass on the attributes of the graphic to the highlight graphic
// this way the maptip will work
UtilDict.forEachEntry(graphic.attributes, function (key, value) {
clone.attributes[key] = value;
});
return clone;
}
/**
* Sorts and groups the svg representation of the map layers on the page to make highlighting work.
* Group all the feature layers and create new groups for highlight, zoomlight, and hoverlight layers.
*
* @method sortLayers
* @private
*/
function sortLayers() {
if (!graphicGroup) {
var svg = Snap.select("svg"),
layers = svg.selectAll("svg g"), // > g:not(.highlightLayer)"),
hoverl = svg.select(".hoverlightLayer"),
zooml = svg.select(".zoomlightLayer"),
hightl = svg.select(".highlightLayer");
graphicGroup = svg.group(layers);
svg.add(graphicGroup);
graphicGroup.after(hightl);
graphicGroup.before(hoverl);
graphicGroup.before(zooml);
graphicGroup.attr({
class: "graphics"
});
}
}
/**
* Clones the Graphic object from the event, adds it to the Highlight layer, and lowers the opacity of other map layers to make the cloned
* Graphic stand out.
*
* @method highlightGraphic
* @private
* @param {Object} eventArg ???
*/
function highlightGraphic(eventArg) {
var graphic = eventArg.graphic,
newGraphic = cloneGraphic(graphic);
sortLayers();
highlightLayer.clear();
// Highlights the selected point by adding a graphic object to the highLight layer
highlightedGraphic = newGraphic;
// Needed to find the symbol in maptip
highlightLayer.sourceLayerId = graphic.getLayer().id;
highlightLayer.objectIdField = graphic.getLayer().objectIdField;
highlightLayer.add(newGraphic);
graphicGroup.attr({
opacity: 0.35
});
}
/**
* Clears the Highlight layer and restores the opacity of the map layers.
*
* @method highlightGraphicHide
* @private
*/
function highlightGraphicHide() {
if (highlightedGraphic) {
highlightedGraphic = null;
if (graphicGroup) {
graphicGroup.attr({
opacity: 1
});
}
zoomLightHide();
highlightLayer.clear();
}
}
/**
* Clones the Graphic object from the event, adds it to the Hoverlight layer.
*
* @method hoverLight
* @private
* @param {Object} eventArg ???
*/
function hoverLight(eventArg) {
var graphic = eventArg.graphic,
newGraphic = cloneGraphic(graphic);
sortLayers();
hoverlightLayer.clear();
hoverlightLayer.add(newGraphic);
}
/**
* Clears the Hoverlight layer.
*
* @method hoverLightHide
* @private
*/
function hoverLightHide() {
hoverlightLayer.clear();
}
/**
* Clones the Graphic object from the event, adds it to the Zoomlight layer, and lowers the opacity of other map layers to make the cloned
* Graphic stand out.
*
* @method zoomLight
* @private
* @param {Object} eventArg ???
*/
function zoomLight(eventArg) {
var graphic = eventArg.graphic,
newGraphic = cloneGraphic(graphic);
sortLayers();
//TODO: ensure that graphics are different
zoomlightGraphic = newGraphic;
zoomlightLayer.clear();
zoomlightLayer.sourceLayerId = graphic.getLayer().id;
zoomlightLayer.objectIdField = graphic.getLayer().objectIdField;
zoomlightLayer.add(newGraphic);
if (graphicGroup) {
graphicGroup.attr({ opacity: 0.35 });
}
}
/**
* Clears the Zoomlight layer and restores the opacity of the map layers if the Highlight layer is empty.
*
* @method zoomLightHide
* @private
*/
function zoomLightHide() {
if (zoomlightGraphic) {
zoomlightGraphic = null;
zoomlightLayer.clear();
if (!highlightedGraphic && graphicGroup) {
graphicGroup.attr({
opacity: 1
});
}
}
}
/**
* If there a Graphic in the Highlihgh layer, resets it's bounding box and repositions an interactive maptip to match the top center of the
* boudning box of the highlighted graphic.
*
* @method repositionInteractive
* @private
*/
function repositionInteractive() {
if (highlightedGraphic) {
window.setTimeout(function () {
var snapGraphic = Snap.select("svg .highlightLayer > *:first-child"),
offset;
// TODO: Update Snap to the latest version
if (snapGraphic) {
snapGraphic._.dirty = true; // (fixed in 0.1.1) dirty hack to a bug: https://github.com/adobe-webplatform/Snap.svg/issues/80
offset = snapGraphic.getBBox().width / 2;
topic.publish(EventManager.Maptips.REPOSITION_INTERACTIVE, {
offset: offset
});
}
}, 10);
}
}
/**
* Initiates various listeners for the class.
*
* @method initListeners
* @private
*/
function initListeners() {
// Subscribe to all the events that causes functionality changes
topic.subscribe(EventManager.FeatureHighlighter.HIGHLIGHT_SHOW, highlightGraphic);
topic.subscribe(EventManager.FeatureHighlighter.HIGHLIGHT_HIDE, highlightGraphicHide);
topic.subscribe(EventManager.FeatureHighlighter.HOVERLIGHT_SHOW, hoverLight);
topic.subscribe(EventManager.FeatureHighlighter.HOVERLIGHT_HIDE, hoverLightHide);
topic.subscribe(EventManager.FeatureHighlighter.ZOOMLIGHT_SHOW, zoomLight);
topic.subscribe(EventManager.FeatureHighlighter.ZOOMLIGHT_HIDE, zoomLightHide);
// Trigger maptips/showInteractive --> display anchoredMapTip
// detect when a new graphic is added to the highlihgt layer and display in interactive tooltip
highlightLayer.on("graphic-node-add", function (evt) {
topic.publish(EventManager.Maptips.SHOW_INTERACTIVE, {
target: $(evt.node),
graphic: highlightedGraphic
});
});
// detect when a new graphic is added to the zoomlight layer and display a
// temporary tooltip only if the zoomlighted graphic is not already highlighted
zoomlightLayer.on("graphic-node-add", function (evt) {
var zgKey = "0",
hgKey = "1",
objectIdField,
zgLayer,
hgLayer;
if (highlightedGraphic) {
zgLayer = zoomlightGraphic.getLayer();
hgLayer = highlightedGraphic.getLayer();
objectIdField = zgLayer.objectIdField;
zgKey = zgLayer.sourceLayerId + zoomlightGraphic.attributes[objectIdField];
hgKey = hgLayer.sourceLayerId + highlightedGraphic.attributes[objectIdField];
}
if (zgKey !== hgKey) {
topic.publish(EventManager.Maptips.SHOW, {
target: $(evt.node),
graphic: zoomlightGraphic
});
}
});
// make sure the interactive tooltip is properly positioned when the user pans and moves the map
topic.subscribe(EventManager.Map.ZOOM_END, repositionInteractive);
topic.subscribe(EventManager.Map.PAN_END, repositionInteractive);
// cancel the graphicGroup after the layer reorder to force recreating of the lighthing layer groups
topic.subscribe(EventManager.Map.REORDER_END, function () {
graphicGroup = null;
});
}
return {
/**
* Initiates the FeatureHighlighter static class.
*
* @method init
*/
init: function () {
config = RAMP.config;
map = RampMap.getMap();
//
highlightLayer = new esri.layers.GraphicsLayer({
id: "highlightLayer",
className: "highlightLayer"
});
highlightLayer.ramp = {
type: GlobalStorage.layerType.Highlight
};
// Layer for showing the graphic that appears when a point
// has the mouse hovering over it but the point has not been
// selected
hoverlightLayer = new esri.layers.GraphicsLayer({
id: "hoverlightLayer",
className: "hoverlightLayer"
});
hoverlightLayer.ramp = {
type: GlobalStorage.layerType.Hoverlight
};
// Layer for showing the graphic that appears after the user
// presses zoom to on a point
zoomlightLayer = new esri.layers.GraphicsLayer({
id: "zoomLightLayer",
className: "zoomlightLayer"
});
zoomlightLayer.ramp = {
type: GlobalStorage.layerType.Zoomlight
};
map.addLayer(highlightLayer);
map.addLayer(hoverlightLayer, 0);
map.addLayer(zoomlightLayer, 0);
initListeners();
}
};
});
Reusable Accessible Mapping Platform