leaflet.history.js

/*! leaflet-history 21-03-2015 */
!function(){L.HistoryControl=L.Control.extend({options:{position:"topright",maxMovesToSave:10,useExternalControls:!1,backImage:"fa fa-caret-left",backText:"",backTooltip:"Go to Previous Extent",backImageBeforeText:!0,forwardImage:"fa fa-caret-right",forwardText:"",forwardTooltip:"Go to Next Extent",forwardImageBeforeText:!1,orientation:"horizontal",shouldSaveMoveInHistory:function(){return!0}},initialize:function(a){L.Util.setOptions(this,a),this._state.maxMovesToSave=this.options.maxMovesToSave},onAdd:function(a){this._map=a;var b=L.DomUtil.create("div","history-control leaflet-bar leaflet-control "+this.options.orientation);return this.options.useExternalControls||(this._backButton=this._createButton("back",b,this.goBack,this),this._forwardButton=this._createButton("forward",b,this.goForward,this)),this._updateDisabled(),this._addMapListeners(),b},onRemove:function(a){a.off("movestart")},performActionWithoutTriggeringEvent:function(a){var b=this._state.ignoringEvents;this._state.ignoringEvents=!0,$.isFunction(a)&&a(),this._state.ignoringEvents=b},moveWithoutTriggeringEvent:function(a){var b=this;this.performActionWithoutTriggeringEvent(function(){b._map.setView(a.centerPoint,a.zoom)})},goBack:function(){return this._invokeBackOrForward("historyback",this._state.history,this._state.future)},goForward:function(){return this._invokeBackOrForward("historyforward",this._state.future,this._state.history)},clearHistory:function(){this._state.history.items=[],this._updateDisabled()},clearFuture:function(){this._state.future.items=[],this._updateDisabled()},_map:null,_backButton:null,_forwardButton:null,_state:{backDisabled:null,forwardDisabled:null,ignoringEvents:!1,maxMovesToSave:0,history:{items:[]},future:{items:[]}},_createButton:function(a,b,c,d){var e=this.options[a+"Text"]||"",f=this.options[a+"Image"]||"",g=this.options[a+"Tooltip"]||"",h=L.DomUtil.create("a","history-"+a+"-button",b);if(f){var i='<i class="'+f+'"></i>';this.options[a+"ImageBeforeText"]?e=i+" "+e:e+=" "+i}h.innerHTML=e,h.href="#",h.title=g;var j=L.DomEvent.stopPropagation;return L.DomEvent.on(h,"click",j).on(h,"mousedown",j).on(h,"dblclick",j).on(h,"click",L.DomEvent.preventDefault).on(h,"click",c,d).on(h,"click",this._refocusOnMap,d),h},_updateDisabled:function(){var a=0===this._state.history.items.length,b=0===this._state.future.items.length;a!==this._state.backDisabled&&(this._state.backDisabled=a,this._map.fire("historyback"+(a?"disabled":"enabled"))),b!==this._state.forwardDisabled&&(this._state.forwardDisabled=b,this._map.fire("historyforward"+(b?"disabled":"enabled"))),this.options.useExternalControls||(this._setButtonDisabled(this._backButton,a),this._setButtonDisabled(this._forwardButton,b))},_setButtonDisabled:function(a,b){var c=$(a),d="leaflet-disabled";b?c.addClass(d):c.removeClass(d)},_pop:function(a){return a=a.items,$.isArray(a)&&a.length>0?a.splice(a.length-1,1)[0]:void 0},_push:function(a,b){var c=this._state.maxMovesToSave;a=a.items,$.isArray(a)&&(a.push(b),c>0&&a.length>c&&a.splice(0,1))},_invokeBackOrForward:function(a,b,c){var d=this._popStackAndUseLocation(b,c);return d?(this._map.fire(a,d),!0):!1},_popStackAndUseLocation:function(a,b){if($.isArray(a.items)&&a.items.length>0){var c=this._buildZoomCenterObjectFromCurrent(this._map),d=this._pop(a);return this._push(b,c),this.moveWithoutTriggeringEvent(d),{previousLocation:d,currentLocation:c}}},_buildZoomCenterObjectFromCurrent:function(a){return new L.ZoomCenter(a.getZoom(),a.getCenter())},_addMapListeners:function(){var a=this;this._map.on("movestart",function(b){if(!a._state.ignoringEvents){var c=a._buildZoomCenterObjectFromCurrent(b.target);a.options.shouldSaveMoveInHistory(c)&&(a._state.future.items=[],a._push(a._state.history,c))}a._updateDisabled()})}})}(),function(){L.ZoomCenter=L.Class.extend({initialize:function(a,b){this.zoom=a,this.centerPoint=b}})}();