AddRSSWeatherLayer.cs
// Copyright 2010 ESRI // // All rights reserved under the copyright laws of the United States // and applicable international laws, treaties, and conventions. // // You may freely redistribute and use this sample code, with or // without modification, provided you include the original copyright // notice and use restrictions. // // See the use restrictions. // using System; using System.Drawing; using System.Windows.Forms; using System.Runtime.InteropServices; using ESRI.ArcGIS.ADF.BaseClasses; using ESRI.ArcGIS.ADF.CATIDs; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.Controls; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.Geometry; using ESRI.ArcGIS.Display; namespace RSSWeatherLayer { /// <summary> /// Add a new weather item given a zipCode. /// </summary> /// <remarks>Should the weather item exist, it will be updated</remarks> [ClassInterface(ClassInterfaceType.None)] [Guid("C9260965-D3AA-4c28-B55A-023C41F1CA39")] [ProgId("RSSWeatherLayer.AddRSSWeatherLayer")] [ComVisible(true)] public sealed class AddRSSWeatherLayer: BaseCommand { #region COM Registration Function(s) [ComRegisterFunction()] [ComVisible(false)] static void RegisterFunction(Type registerType) { // Required for ArcGIS Component Category Registrar support ArcGISCategoryRegistration(registerType); // // TODO: Add any COM registration code here // } [ComUnregisterFunction()] [ComVisible(false)] static void UnregisterFunction(Type registerType) { // Required for ArcGIS Component Category Registrar support ArcGISCategoryUnregistration(registerType); // // TODO: Add any COM unregistration code here // } #region ArcGIS Component Category Registrar generated code /// <summary> /// Required method for ArcGIS Component Category registration - /// Do not modify the contents of this method with the code editor. /// </summary> private static void ArcGISCategoryRegistration(Type registerType) { string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID); ControlsCommands.Register(regKey); MxCommands.Register(regKey); } /// <summary> /// Required method for ArcGIS Component Category unregistration - /// Do not modify the contents of this method with the code editor. /// </summary> private static void ArcGISCategoryUnregistration(Type registerType) { string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID); ControlsCommands.Unregister(regKey); MxCommands.Unregister(regKey); } #endregion #endregion private sealed class InvokeHelper : Control { //delegate used to pass the invoked method to the main thread public delegate void RefreshHelper(WKSEnvelope invalidateExtent); public delegate void RefreshWeatherItemHelper(WeatherItemEventArgs weatherItemInfo); private IActiveView m_activeView = null; private RSSWeatherLayerClass m_weatherLayer = null; private IEnvelope m_invalidateExtent = null; private IPoint m_point; public InvokeHelper (IActiveView activeView, RSSWeatherLayerClass weatherLayer) { m_activeView = activeView; m_weatherLayer = weatherLayer; CreateHandle(); CreateControl(); m_invalidateExtent = new EnvelopeClass(); m_invalidateExtent.SpatialReference = activeView.ScreenDisplay.DisplayTransformation.SpatialReference; m_point = new PointClass(); m_point.SpatialReference = activeView.ScreenDisplay.DisplayTransformation.SpatialReference; } public void RefreshWeatherItem(WeatherItemEventArgs weatherItemInfo) { try { // Invoke the RefreshInternal through its delegate if (!this.IsDisposed && this.IsHandleCreated) Invoke(new RefreshWeatherItemHelper(RefreshWeatherItemInvoked), new object[] { weatherItemInfo }); } catch (Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } public void Refresh (WKSEnvelope invalidateExtent) { try { // Invoke the RefreshInternal through its delegate if (!this.IsDisposed && this.IsHandleCreated) Invoke(new RefreshHelper(RefreshInvoked), new object[] { invalidateExtent }); } catch (Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } private void RefreshWeatherItemInvoked(WeatherItemEventArgs weatherItemInfo) { ITransformation transform = m_activeView.ScreenDisplay.DisplayTransformation as ITransformation; if (transform == null) return; double[] iconDimensions = new double[2]; iconDimensions[0] = (double)weatherItemInfo.IconWidth; iconDimensions[1] = (double)weatherItemInfo.IconHeight; double[] iconDimensionsMap = new double[2]; transform.TransformMeasuresFF(esriTransformDirection.esriTransformReverse, 1, ref iconDimensionsMap[0], ref iconDimensions[0]); m_invalidateExtent.PutCoords(0, 0, iconDimensionsMap[0], iconDimensionsMap[0]); m_point.PutCoords(weatherItemInfo.mapX, weatherItemInfo.mapY); m_invalidateExtent.CenterAt(m_point); m_activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, m_weatherLayer, m_invalidateExtent); m_activeView.ScreenDisplay.UpdateWindow(); } private void RefreshInvoked(WKSEnvelope invalidateExtent) { m_invalidateExtent.PutWKSCoords(ref invalidateExtent); if (!m_invalidateExtent.IsEmpty) m_activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, m_weatherLayer, m_invalidateExtent); else m_activeView.PartialRefresh(esriViewDrawPhase.esriViewGeography, m_weatherLayer, null); m_activeView.ScreenDisplay.UpdateWindow(); } } private InvokeHelper m_invokeHelper = null; //class members private IHookHelper m_pHookHelper = null; private RSSWeatherLayerClass m_weatherLayer = null; private bool m_bOnce = true; private bool m_bConnected = false; public AddRSSWeatherLayer() { base.m_category = "Weather"; base.m_caption = "Add RSS Weather Layer"; base.m_message = "Add RSS Weather Layer"; base.m_toolTip = "Add RSS Weather Layer"; base.m_name = base.m_category + "_" + base.m_caption; try { string bitmapResourceName = GetType().Name + ".bmp"; base.m_bitmap = new Bitmap(GetType(), bitmapResourceName); } catch (Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap"); } } #region Overriden Class Methods /// <summary> /// Occurs when this command is created /// </summary> /// <param name="hook">Instance of the application</param> public override void OnCreate(object hook) { //Instantiate the hook helper if (m_pHookHelper == null) m_pHookHelper = new HookHelperClass (); //set the hook m_pHookHelper.Hook = hook; //set verbose events in order to listen to ItemDeleted event ((IViewManager)m_pHookHelper.FocusMap).VerboseEvents = true; //hook the ItemDeleted event in order to track removal of the layer from the TOC ((IActiveViewEvents_Event)m_pHookHelper.FocusMap).ItemDeleted += new IActiveViewEvents_ItemDeletedEventHandler(OnItemDeleted); } /// <summary> /// Occurs when this command is clicked /// </summary> public override void OnClick() { try { if(!m_bConnected) { //check first that the layer was added to the globe if(m_bOnce == true) { //instantiate the layer m_weatherLayer = new RSSWeatherLayerClass(); m_invokeHelper = new InvokeHelper(m_pHookHelper.ActiveView, m_weatherLayer); m_bOnce = false; } //test whether the layer has been added to the map bool bLayerHasBeenAdded = false; ILayer layer = null; if(m_pHookHelper.FocusMap.LayerCount != 0) { IEnumLayer layers = m_pHookHelper.FocusMap.get_Layers(null, false); layers.Reset(); layer = layers.Next(); while(layer != null) { if(layer is RSSWeatherLayerClass) { bLayerHasBeenAdded = true; break; } layer = layers.Next(); } } //add the layer to the map if(!bLayerHasBeenAdded) { layer = (ILayer)m_weatherLayer; layer.Name = "RSS Weather Layer"; try { m_pHookHelper.FocusMap.AddLayer(layer); //wires layer's events m_weatherLayer.OnWeatherItemAdded += new WeatherItemAdded(OnWeatherItemAdded); m_weatherLayer.OnWeatherItemsUpdated += new WeatherItemsUpdated(OnWeatherItemsUpdated); } catch(Exception ex) { System.Diagnostics.Trace.WriteLine("Failed" + ex.Message); } } //connect to the service m_weatherLayer.Connect(); } else { //disconnect from the service m_weatherLayer.Disconnect(); //un-wires layer's events m_weatherLayer.OnWeatherItemAdded -= new WeatherItemAdded(OnWeatherItemAdded); m_weatherLayer.OnWeatherItemsUpdated -= new WeatherItemsUpdated(OnWeatherItemsUpdated); //delete the layer m_pHookHelper.FocusMap.DeleteLayer(m_weatherLayer); //dispose the layer m_weatherLayer = null; m_bOnce = true; } m_bConnected = !m_bConnected; } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } /// <summary> /// Indicates whether or not this command is checked. /// </summary> public override bool Checked { get { m_bConnected = false; return m_bConnected; } } #endregion /// <summary> /// weather layer ItemAdded event handler /// </summary> /// <param name="sender"></param> /// <param name="args"></param> /// <remarks>gets fired when an item is added to the table</remarks> private void OnWeatherItemAdded(object sender, WeatherItemEventArgs args) { // use the invoke helper since this event gets fired on a different thread m_invokeHelper.RefreshWeatherItem(args); } /// <summary> /// Weather layer ItemsUpdated event handler /// </summary> /// <param name="sender"></param> /// <param name="args"></param> /// <remarks>gets fired when the update thread finish updating all the items in the table</remarks> private void OnWeatherItemsUpdated(object sender, EventArgs args) { //refresh the display WKSEnvelope emptyEnv; emptyEnv.XMax = emptyEnv.XMin = emptyEnv.YMax = emptyEnv.YMin = 0; m_invokeHelper.Refresh(emptyEnv); } /// <summary> /// Listen to ActiveViewEvents.ItemDeleted in order to track whether the layer has been /// removed from the TOC /// </summary> /// <param name="Item"></param> void OnItemDeleted(object Item) { //test that the deleted layer is RSSWeatherLayerClass if (Item is RSSWeatherLayerClass) { if (m_bConnected && null != m_weatherLayer) { m_bConnected = false; //disconnect from the service m_weatherLayer.Disconnect(); //dispose the layer m_weatherLayer = null; m_bOnce = true; } } } } }