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In my last blog post I talked about the Spark Tree from Maxim . When I was looking for a Spark Tree my final objective was to have a Spark Tree with a custom renderer that involved a three state checkbox. A checkbox that could show selected, unselected and "intermediate" states. After googling a bit I decided it was a good exercise to build on from scratch in Spark using Skins. It turned out to be much easier than I thought so I decided Ill share the full sample code here. 

This sample is a Spark Tree from Maxim http://kachurovskiy.com/2010/spark-tree/ that has a Custom Renderer with a 3 state checkbox that indicates when a child element is selected. I have also included a custom class for the Data which controls the child elements and parent elements states. This is just a sample so the code is a bit messy, since I did all the clean up in my main project after I established proof of concept. 

Here is the sample with view source enabled. Spark Tree with Checkbox renderer

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First off thank you to Maxim for posting a really great Spark component. It was when I was trying to wrestle with a custom renderer for an mx tree that I started looking to see if someone had developed a Spark Tree component. Not only did I find a great component but it was free to use. Maxim has created this Spark Tree component by extending the spark List component and made it really easy to integrate into your project. One of my struggles with mx tree was that when you created item renderers that had varying height, the scroll bar would keep jumping around depending on what nodes you had expanded and collapsed. The great thing about the Spark Tree component from Maxim is that it extends the list with and by setting useVirtualLayout to false you can render all the nodes at once eliminating the varying size scrollbar. It is also extremely easy to implement your own itemrenderer by using the DefaultItemRenderer as a template. 

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In order to access HTTPS data (requests) from HTTP pages (or Flash movies i.e. swfs ) set the cross domain policy as such.

<cross-domain-policy>
<allow-access-from domain="*" secure="false"/>
</cross-domain-policy>

The domain in the example is specified as * but you can restrict the domain as needed.

Adobe artilce with a detailed cross domain file specification http://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html

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This website provides an independent and open tool for scanning your Facebook privacy settings. The source code and its development will always remain open and transparent.

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http://www.flexpasta.com/index.php/2008/03/15/getting-url-parameters-host-name-port-in-flex-actionscript/

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http://botw.org/articles/gmail-hacks.htm

http://webworkerdaily.com/2009/06/18/using-gmail-aliases-for-better-orginization/

http://www.makeuseof.com/tag/1-awesome-gmail-tip-you-dont-know-about-seriously/

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Yet another old post from my previous blog

When you want to rebuild a featureclass programmatically that is in use from lets say a SQL table you have two options. One is to create a new featureclass and rename it to the new one after the old one is renamed to a different name. This requires exclusive locks that may not be available and cause the program to crash. The other option is to delete all the features through IFeatureClass interface which can be really time consuming.

There is another alternative, using direct SQL to truncate the three tables that are associated with a featureclass. This does not require any exclusive locks and can be done while the featureclass is in use. Also it is cleaner and much faster.

Below is the code to truncate a featureclass in C#

  public void TruncateFeatureclass(IFeatureClass pFeatClass, IWorkspace pWorkspaceSDE)
        {
           
            IDataset pDataset;
            pDataset = (IDataset)pFeatClass;
            IWorkspace pWorkspaceData;
            pWorkspaceData = pDataset.Workspace;

            string strFCName;
            strFCName = pDataset.Name;
            int lngPosDot;
            lngPosDot = strFCName.IndexOf(".");  //InStr(strFCName, ".");
            string strOwner;
            string strName;
            string strdbName;
            string ownDotName;
            strdbName = strFCName.Substring(0, lngPosDot);//Left(strFCName, lngPosDot - 1);
            ownDotName = strFCName.Substring(lngPosDot + 1, strFCName.Length - lngPosDot - 1);
            int lngPosDot2;
            lngPosDot2 = ownDotName.IndexOf(".");
            strOwner = ownDotName.Substring(0, lngPosDot2);

            strName = ownDotName.Substring(lngPosDot2 + 1, ownDotName.Length - lngPosDot2 - 1); //Mid(strFCName, lngPosDot + 1);

            IFeatureWorkspace pFeatWorkspace;
            pFeatWorkspace = (IFeatureWorkspace)pWorkspaceSDE;

            IQueryDef pQueryDef;
            ICursor pCursor;
            IRow pRow;
            pQueryDef = pFeatWorkspace.CreateQueryDef();
            pQueryDef.Tables = "sde_layers";
            pQueryDef.SubFields = "sde_layers.layer_id";
            pQueryDef.WhereClause = "sde_layers.owner='" + strOwner.ToUpper() + "' and sde_layers.table_name = '" + strName.ToUpper() + "'";
            pCursor = pQueryDef.Evaluate();
            pRow = pCursor.NextRow();

            long lngLayerId;
            lngLayerId = Convert.ToInt64(pRow.get_Value(0));

            pWorkspaceData.ExecuteSQL("TRUNCATE TABLE " + strFCName);
            pWorkspaceData.ExecuteSQL("TRUNCATE TABLE F" + lngLayerId);
            pWorkspaceData.ExecuteSQL("TRUNCATE TABLE S" + lngLayerId);
        }

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Import from my old blog

Public Function CreateThiessenFC(pFeatureClass As IFeatureClass, pPoly As IPolygon, pFDS As IFeatureDataset) As IFeatureClass 'If (Not dbUtil.ResolveOutputFeatureClassName(txtOutput, sOutCat, sOutWSName, sOutDSName, sOutFCName, True)) Then ' If (dbUtil.GetErrorCode = 1) Then ' MsgBox dbUtil.GetErrorMessage, vbCritical ' End If ' Exit Sub 'End If 'Me.MousePointer = vbHourglass  Dim pGDS As IGeoDataset Set pGDS = pFeatureClass Dim pSR As ISpatialReference Set pSR = pGDS.SpatialReference  Dim pFields As IFields2 Set pFields = pFeatureClass.Fields  Dim pOIDField As IField Dim lOIDInx As Long lOIDInx = pFields.FindField(pFeatureClass.OIDFieldName) Set pOIDField = pFields.Field(lOIDInx)  Dim pOutFC As IFeatureClass 'Check the parameter of this function Set pOutFC = createDatasetFeatureClass(pFDS, "thiessen", esriFTSimple, esriGeometryPolygon, Nothing, Nothing, Nothing) 'This is the old one 'Set pOutFC = createDatasetFeatureClass(sOutCat, sOutWSName, sOutDSName, sOutFCName, esriGeometryPolygon, False, False, pSR)  Dim pTinEdit As ITinEdit Set pTinEdit = New Tin pTinEdit.InitNew pGDS.Extent  Dim pTinAdv As ITinAdvanced2 Set pTinAdv = pTinEdit  pTinEdit.AddFromFeatureClass pFeatureClass, Nothing, pOIDField, pOIDField, esriTinMassPoint  pTinEdit.Refresh ' get proper extent so default voronoi clip poly is ok   'Before converting to the theissen check for the bounding polygon   Dim pNodeCol As ITinNodeCollection Set pNodeCol = pTinEdit pNodeCol.ConvertToVoronoiRegions pOutFC, Nothing, pPoly, "", ""  'pTinEdit.SaveAs (sOutWSName & "\" & dbUtil.GetUniqueFileName(sOutWSName)) 'pTinEdit.StopEditing False  'AddFeatureLayer m_pApp, pOutFC  Set CreateThiessenFC = pOutFC  'Release the variables  Set pGDS = Nothing Set pSR = Nothing Set pFields = Nothing Set pOIDField = Nothing 'Set lOIDInx = Nothing Set pOutFC = Nothing Set pNodeCol = Nothing Set pNodeCol = Nothing  End Function

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