Smrf.NodeXL.ExcelTemplate.TaskPane.EnableContextMenuItems C# (CSharp) Method

    EnableContextMenuItems
    (
        IVertex oClickedVertex
    )
    {
        AssertValid();

        // Base name of custom menu items.

        const String CustomMenuItemNameBase = "msiCustom";

        // Remove any custom menu items that were added in a previous call to
        // this method.

        ToolStripItemCollection oItems = cmsNodeXLControl.Items;
        Int32 iItems = oItems.Count;

        for (Int32 i = iItems - 1; i >= 0; i--)
        {
            ToolStripItem oItem = oItems[i];

            if ( oItem.Name.StartsWith(CustomMenuItemNameBase) )
            {
                oItems.Remove(oItem);
            }
        }

        Boolean bNonEmptyWorkbookRead = this.NonEmptyWorkbookRead;

        ICollection<IVertex> oSelectedVertices =
            oNodeXLControl.SelectedVertices;

        Int32 iSelectedVertices = oSelectedVertices.Count;

        // Selecting a vertex's incident edges makes sense only if they are not
        // automatically selected when the vertex is clicked.

        msiContextSelectIncidentEdges.Visible =
            !( new GeneralUserSettings() ).AutoSelect;

        // Selectively enable menu items.

        Boolean bEnableSelectAllVertices, bEnableDeselectAllVertices,
            bEnableSelectAdjacentVertices, bEnableDeselectAdjacentVertices,
            bEnableSelectIncidentEdges, bEnableDeselectIncidentEdges,
            bEnableEditVertexAttributes, bEnableSelectSubgraphs;

        GetVertexCommandEnableFlags(oClickedVertex,
            out bEnableSelectAllVertices, out bEnableDeselectAllVertices,
            out bEnableSelectAdjacentVertices,
            out bEnableDeselectAdjacentVertices,
            out bEnableSelectIncidentEdges,
            out bEnableDeselectIncidentEdges,
            out bEnableEditVertexAttributes,
            out bEnableSelectSubgraphs
            );

        Boolean bEnableSelectAllEdges, bEnableDeselectAllEdges, bNotUsed1,
            bNotUsed2, bEnableEditEdgeAttributes;

        GetEdgeCommandEnableFlags(null, out bEnableSelectAllEdges,
            out bEnableDeselectAllEdges, out bNotUsed1, out bNotUsed2,
            out bEnableEditEdgeAttributes);

        msiContextSelectAllVertices.Enabled = bEnableSelectAllVertices;
        msiContextDeselectAllVertices.Enabled = bEnableDeselectAllVertices;

        msiContextSelectAdjacentVertices.Enabled =
            bEnableSelectAdjacentVertices;

        msiContextDeselectAdjacentVertices.Enabled =
            bEnableDeselectAdjacentVertices;

        msiContextSelectIncidentEdges.Enabled =
            bEnableSelectIncidentEdges;

        msiContextDeselectIncidentEdges.Enabled =
            bEnableDeselectIncidentEdges;

        msiContextEditEdgeAttributes.Enabled = bEnableEditEdgeAttributes;
        msiContextEditVertexAttributes.Enabled = bEnableEditVertexAttributes;

        msiContextSelectSubgraphs.Enabled = bEnableSelectSubgraphs;

        MenuUtil.EnableToolStripMenuItems(
            bNonEmptyWorkbookRead && iSelectedVertices > 0,
            msiContextForceLayoutSelected
            );

        MenuUtil.EnableToolStripMenuItems(
            bNonEmptyWorkbookRead,
            msiContextForceLayout,
            msiContextForceLayoutVisible,
            msiContextSelectAll,
            msiContextDeselectAll,
            msiContextInvertSelection
            );

        MenuUtil.EnableToolStripMenuItems(
            bNonEmptyWorkbookRead && iSelectedVertices > 1,
            msiContextForceLayoutSelectedWithinBounds
            );

        msiContextSelectAllEdges.Enabled = bEnableSelectAllEdges;
        msiContextDeselectAllEdges.Enabled = bEnableDeselectAllEdges;

        MenuUtil.EnableToolStripMenuItems(

            msiContextSelectAllVertices.Enabled ||
                msiContextSelectAllEdges.Enabled,

            msiContextSelectAllVerticesAndEdges
            );

        MenuUtil.EnableToolStripMenuItems(

            msiContextDeselectAllVertices.Enabled ||
                msiContextDeselectAllEdges.Enabled,

            msiContextDeselectAllVerticesAndEdges
            );

        // Store the clicked vertex (or null if no vertex was clicked) in the
        // menu items' Tag property for use by the menu item's Click handler.

        msiContextSelectAdjacentVertices.Tag =
            msiContextDeselectAdjacentVertices.Tag =
            msiContextSelectIncidentEdges.Tag =
            msiContextDeselectIncidentEdges.Tag =
            msiContextSelectSubgraphs.Tag =
            oClickedVertex;

        if (iSelectedVertices == 1)
        {
            // Look for custom menu item information in the vertex's metadata.

            Object oCustomMenuItemInformationAsObject;

            IVertex oSelectedVertex = oSelectedVertices.First();

            if ( oSelectedVertex.TryGetValue(
                    ReservedMetadataKeys.CustomContextMenuItems,
                    typeof( KeyValuePair<String, String>[] ),
                    out oCustomMenuItemInformationAsObject) )
            {
                // List of string pairs, one pair for each custom menu item to
                // add to the vertex's context menu.  The key is the custom
                // menu item text and the value is the custom menu item action.

                KeyValuePair<String, String> [] aoCustomMenuItemInformation =
                    ( KeyValuePair<String, String> [] )
                        oCustomMenuItemInformationAsObject;

                if (aoCustomMenuItemInformation.Length > 0)
                {
                    // Add a separator before the custom menu items.

                    ToolStripSeparator oToolStripSeparator =
                        new ToolStripSeparator();

                    oToolStripSeparator.Name =
                        CustomMenuItemNameBase + "Separator";

                    cmsNodeXLControl.Items.Add(oToolStripSeparator);
                }

                Int32 i = 0;

                foreach (KeyValuePair<String, String> oKeyValuePair in
                    aoCustomMenuItemInformation)
                {
                    // Add a custom menu item.  The tag stores the custom
                    // action.

                    String sCustomMenuItemText = oKeyValuePair.Key;
                    String sCustomMenuItemAction = oKeyValuePair.Value;

                    ToolStripMenuItem oToolStripMenuItem =
                        new ToolStripMenuItem(sCustomMenuItemText);

                    oToolStripMenuItem.Name =
                        CustomMenuItemNameBase + i.ToString();

                    oToolStripMenuItem.Tag = sCustomMenuItemAction;

                    oToolStripMenuItem.Click +=
                        new EventHandler(this.msiContextCustomMenuItem_Click);

                    cmsNodeXLControl.Items.Add(oToolStripMenuItem);

                    i++;
                }
            }
        }
    }