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

    ShowDynamicFilters()
    {
        AssertValid();

        if (oNodeXLControl.IsLayingOutGraph || !this.NonEmptyWorkbookRead)
        {
            return;
        }

        if (m_oDynamicFilterDialog != null)
        {
            m_oDynamicFilterDialog.Activate();
            return;
        }

        // The dialog is created on demand.

        m_oDynamicFilterDialog = new DynamicFilterDialog(m_oWorkbook);

        Int32 iHwnd = m_oWorkbook.Application.Hwnd;

        m_oDynamicFilterDialog.DynamicFilterColumnsChanged +=
            new DynamicFilterColumnsChangedEventHandler(
                m_oDynamicFilterDialog_DynamicFilterColumnsChanged);

        m_oDynamicFilterDialog.FilteredAlphaChanged +=
            new EventHandler(m_oDynamicFilterDialog_FilteredAlphaChanged);

        m_oDynamicFilterDialog.FormClosed += delegate
        {
            // See the code in ThisWorkbook that opens the
            // AutoFillWorkbookDialog for an explanation of why the
            // SetForegroundWindow() call is necessary.

            Win32Functions.SetForegroundWindow( new IntPtr(iHwnd) );

            m_oDynamicFilterDialog = null;
        };

        // Create a HashSet of edges that have been filtered by edge filters,
        // and a HashSet of vertices that have been filtered by vertex filters.
        //
        // Store the HashSets within the dialog so they are automatically
        // destroyed when the dialog is destroyed.

        m_oDynamicFilterDialog.Tag = new HashSet<Int32> [] {
            new HashSet<Int32>(),
            new HashSet<Int32>()
            };

        m_oDynamicFilterDialog.Show( new Win32Window(iHwnd) );

        // If the dialog throws an exception during initialization,
        // m_oDynamicFilterDialog gets set to null by the FormClosed delegate
        // above.

        if (m_oDynamicFilterDialog != null)
        {
            ReadDynamicFilterColumns(false);

            DynamicFilterHandler.ReadFilteredAlpha(m_oDynamicFilterDialog,
                oNodeXLControl, true);

            UpdateDynamicFiltersLegend();
        }
    }