fyiReporting.RdlDesign.RdlDesigner.DesignTabChanged C# (CSharp) Method

        private void DesignTabChanged(object sender, System.EventArgs e)
        {
            MDIChild mc = this.ActiveMdiChild as MDIChild;
            DesignTabs tab = DesignTabs.Edit;
            if (mc != null)
                tab = mc.DesignTab;
            bool bEnableEdit = false;
            bool bEnableDesign = false;
            bool bEnablePreview = false;
            bool bShowProp = _ShowProperties;
            switch (tab)
            {
                case DesignTabs.Edit:
                    bEnableEdit = true;
                    if (_PropertiesAutoHide)
                        bShowProp = false;
                    break;
                case DesignTabs.Design:
                    bEnableDesign = true;
                    break;
                case DesignTabs.Preview:
                    if (_PropertiesAutoHide)
                        bShowProp = false;
                    bEnablePreview = true;
                    break;
            }
            if (!bEnableEdit && this._ValidateRdl != null)
            {
                this._ValidateRdl.Close();
            }
            mainProperties.Visible = mainSP.Visible = bShowProp;
            if (leftAlignToolStripButton2 != null)
            {
                leftAlignToolStripButton2.Enabled = bEnableDesign;
            }
            if (centerAlignToolStripButton2 != null)
            {
                centerAlignToolStripButton2.Enabled = bEnableDesign;
            }
            if (rightAlignToolStripButton3 != null)
            {
                rightAlignToolStripButton3.Enabled = bEnableDesign;
            }
            if (boldToolStripButton1 != null)
            {
                boldToolStripButton1.Enabled = bEnableDesign;
            }
            if (italiacToolStripButton1 != null)
            {
                italiacToolStripButton1.Enabled = bEnableDesign;
            }
            if (underlineToolStripButton2 != null)
            {
                underlineToolStripButton2.Enabled = bEnableDesign;
            }
            if (fontToolStripComboBox1 != null)
            {
                fontToolStripComboBox1.Enabled = bEnableDesign;
            }
            if (fontSizeToolStripComboBox1 != null)
            {
                fontSizeToolStripComboBox1.Enabled = bEnableDesign;
            }
            if (foreColorPicker1 != null)
            {
                foreColorPicker1.Enabled = bEnableDesign;
            }
            if (backColorPicker1 != null)
            {
                backColorPicker1.Enabled = bEnableDesign;
            }
            if (cutToolStripButton1 != null)
            {
                cutToolStripButton1.Enabled = bEnableDesign | bEnableEdit;
            }
            if (copyToolStripButton1 != null)
            {
                copyToolStripButton1.Enabled = bEnableDesign | bEnableEdit | bEnablePreview;
            }
            if (undoToolStripButton1 != null)
            {
                undoToolStripButton1.Enabled = bEnableDesign | bEnableEdit;
            }
            if (pasteToolStripButton1 != null)
            {
                pasteToolStripButton1.Enabled = bEnableDesign | bEnableEdit;
            }
            if (printToolStripButton2 != null)
            {
                printToolStripButton2.Enabled = bEnablePreview;
            }
            if (textboxToolStripButton1 != null)
            {
                textboxToolStripButton1.Enabled = bEnableDesign;
            }
            if (selectToolStripButton2 != null)
            {
                selectToolStripButton2.Enabled = bEnablePreview;
                selectToolStripButton2.Checked = mc == null ? false : mc.SelectionTool;
            }
            if (chartToolStripButton1 != null)
            {
                chartToolStripButton1.Enabled = bEnableDesign;
            }
            if (rectangleToolStripButton1 != null)
            {
                rectangleToolStripButton1.Enabled = bEnableDesign;
            }
            if (tableToolStripButton1 != null)
            {
                tableToolStripButton1.Enabled = bEnableDesign;
            }
            if (matrixToolStripButton1 != null)
            {
                matrixToolStripButton1.Enabled = bEnableDesign;
            }
            if (listToolStripButton1 != null)
            {
                listToolStripButton1.Enabled = bEnableDesign;
            }
            if (lineToolStripButton1 != null)
            {
                lineToolStripButton1.Enabled = bEnableDesign;
            }
            if (imageToolStripButton1 != null)
            {
                imageToolStripButton1.Enabled = bEnableDesign;
            }
            if (subreportToolStripButton1 != null)
            {
                subreportToolStripButton1.Enabled = bEnableDesign;
            }
            if (pdfToolStripButton2 != null)
            {
                pdfToolStripButton2.Enabled = bEnablePreview;
            }
            if (TifToolStripButton2 != null)
            {
                TifToolStripButton2.Enabled = bEnablePreview;
            }
            if (XmlToolStripButton2 != null)
            {
                XmlToolStripButton2.Enabled = bEnablePreview;
            }
            if (htmlToolStripButton2 != null)
            {
                htmlToolStripButton2.Enabled = bEnablePreview;
            }
            if (MhtToolStripButton2 != null)
            {
                MhtToolStripButton2.Enabled = bEnablePreview;
            }
            if (CsvToolStripButton2 != null)
            {
                CsvToolStripButton2.Enabled = bEnablePreview;
            }
            if (excelToolStripButton2 != null)
            {
                excelToolStripButton2.Enabled = bEnablePreview;
            }
            if (RtfToolStripButton2 != null)
            {
                RtfToolStripButton2.Enabled = bEnablePreview;
            }

            foreach (var item in insertToolStripMenuItem.DropDownItems.OfType<ToolStripItem>())
            {
                item.Enabled = bEnableDesign;
            }

            this.EnableEditTextBox();

            if (zoomToolStripComboBox1 != null)
            {
                zoomToolStripComboBox1.Enabled = bEnablePreview;
                string zText = "Actual Size";
                if (mc != null)
                {
                    switch (mc.ZoomMode)
                    {
                        case ZoomEnum.FitWidth:
                            zText = "Fit Width";
                            break;
                        case ZoomEnum.FitPage:
                            zText = "Fit Page";
                            break;
                        case ZoomEnum.UseZoom:
                            if (mc.Zoom == 1)
                                zText = "Actual Size";
                            else
                                zText = string.Format("{0:0}", mc.Zoom * 100f);
                            break;
                    }
                    zoomToolStripComboBox1.Text = zText;
                }
            }
            // when no active sheet
            if (this.saveToolStripButton1 != null)
                this.saveToolStripButton1.Enabled = mc != null;

            // Update the status and position information
            SetStatusNameAndPosition();
        }