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Shawn Allen
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Dec 13, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
|
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| var HAS_HASHCHANGE = (function() { | ||
| var doc_mode = window.documentMode; | ||
| return ('onhashchange' in window) | ||
| && (doc_mode === undefined || doc_mode > 7); | ||
| })(); | ||
|
|
||
| MM.Hash = function(map) { | ||
| this.onMapMove = MM.bind(this.onMapMove, this); | ||
| this.onHashChange = MM.bind(this.onHashChange, this); | ||
| if (map) { | ||
| this.init(map); | ||
| } | ||
| }; | ||
|
|
||
| MM.Hash.prototype = { | ||
| map: null, | ||
| lastHash: null, | ||
|
|
||
| parseHash: function(hash) { | ||
| var args = hash.split("/"); | ||
| if (args.length == 3) { | ||
| var zoom = parseInt(args[0]), | ||
| lat = parseFloat(args[1]), | ||
| lon = parseFloat(args[2]); | ||
| if (isNaN(zoom) || isNaN(lat) || isNaN(lon)) { | ||
| return false; | ||
| } else { | ||
| return { | ||
| center: new MM.Location(lat, lon), | ||
| zoom: zoom | ||
| }; | ||
| } | ||
| } else { | ||
| return false; | ||
| } | ||
| }, | ||
|
|
||
| formatHash: function(map) { | ||
| var center = map.getCenter(), | ||
| zoom = map.getZoom(), | ||
| precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2)); | ||
| return "#" + [zoom, | ||
| center.lat.toFixed(precision), | ||
| center.lon.toFixed(precision) | ||
| ].join("/"); | ||
| }, | ||
|
|
||
| init: function(map) { | ||
| this.map = map; | ||
| this.map.addCallback("drawn", this.onMapMove); | ||
| // reset the hash | ||
| this.lastHash = null; | ||
| this.onHashChange(); | ||
|
|
||
| if (!this.isListening) { | ||
| this.startListening(); | ||
| } | ||
| }, | ||
|
|
||
| remove: function() { | ||
| this.map = null; | ||
| if (this.isListening) { | ||
| this.stopListening(); | ||
| } | ||
| }, | ||
|
|
||
| onMapMove: function(map) { | ||
| if (this.movingMap) { | ||
| return false; | ||
| } | ||
| var hash = this.formatHash(map); | ||
| if (this.lastHash != hash) { | ||
| location.replace(hash); | ||
| this.lastHash = hash; | ||
| } | ||
| }, | ||
|
|
||
| onHashChange: function() { | ||
| var hash = location.hash; | ||
| if (hash === this.lastHash) { | ||
| // console.info("(no change)"); | ||
| return; | ||
| } | ||
| var sansHash = hash.substr(1), | ||
| parsed = this.parseHash(sansHash); | ||
| if (parsed) { | ||
| // console.log("parsed:", parsed.zoom, parsed.center.toString()); | ||
| this.movingMap = true; | ||
| this.map.setCenterZoom(parsed.center, parsed.zoom); | ||
| this.movingMap = false; | ||
| } else { | ||
| // console.warn("parse error; resetting"); | ||
| this.onMapMove(this.map); | ||
| } | ||
| }, | ||
|
|
||
| isListening: false, | ||
| hashChangeInterval: null, | ||
| startListening: function() { | ||
| if (HAS_HASHCHANGE) { | ||
| window.addEventListener("hashchange", this.onHashChange, false); | ||
| } else { | ||
| clearInterval(this.hashChangeInterval); | ||
| this.hashChangeInterval = setInterval(this.onHashChange, 50); | ||
| } | ||
| this.isListening = true; | ||
| }, | ||
|
|
||
| stopListening: function() { | ||
| if (HAS_HASHCHANGE) { | ||
| window.removeEventListener("hashchange", this.onHashChange); | ||
| } else { | ||
| clearInterval(this.hashChangeInterval); | ||
| } | ||
| this.isListening = false; | ||
| } | ||
| }; |