// Occurs when MouseDown on the TooLStripItem glyph
        public override bool OnMouseDown(Glyph g, MouseButtons button, Point mouseLoc)
        {
            ToolStripItemGlyph glyph     = g as ToolStripItemGlyph;
            ToolStripItem      glyphItem = glyph.Item;
            ISelectionService  selSvc    = GetSelectionService(glyphItem);
            BehaviorService    bSvc      = GetBehaviorService(glyphItem);
            ToolStripKeyboardHandlingService keyService = GetKeyBoardHandlingService(glyphItem);

            if ((button == MouseButtons.Left) && (keyService != null) && (keyService.TemplateNodeActive))
            {
                if (keyService.ActiveTemplateNode.IsSystemContextMenuDisplayed)
                {
                    // skip behaviors when the context menu is displayed
                    return(false);
                }
            }

            IDesignerHost designerHost = (IDesignerHost)glyphItem.Site.GetService(typeof(IDesignerHost));

            Debug.Assert(designerHost != null, "Invalid DesignerHost");

            //Cache original selection
            ICollection originalSelComps = null;

            if (selSvc != null)
            {
                originalSelComps = selSvc.GetSelectedComponents();
            }

            // Add the TemplateNode to the Selection if it is currently Selected as the GetSelectedComponents wont do it for us.
            ArrayList origSel = new ArrayList(originalSelComps);

            if (origSel.Count == 0)
            {
                if (keyService != null && keyService.SelectedDesignerControl != null)
                {
                    origSel.Add(keyService.SelectedDesignerControl);
                }
            }

            if (keyService != null)
            {
                keyService.SelectedDesignerControl = null;
                if (keyService.TemplateNodeActive)
                {
                    // If templateNode Active .. commit and Select it
                    keyService.ActiveTemplateNode.CommitAndSelect();
                    // if the selected item is clicked .. then commit the node and reset the selection (refer 488002)
                    if (selSvc.PrimarySelection is ToolStripItem currentSel && currentSel == glyphItem)
                    {
                        selSvc.SetSelectedComponents(null, SelectionTypes.Replace);
                    }
                }
            }

            if (selSvc == null || MouseHandlerPresent(glyphItem))
            {
                return(false);
            }

            if (glyph != null && button == MouseButtons.Left)
            {
                ToolStripItem selectedItem = selSvc.PrimarySelection as ToolStripItem;
                // Always set the Drag-Rect for Drag-Drop...
                SetParentDesignerValuesForDragDrop(glyphItem, true, mouseLoc);
                // Check if this item is already selected ...
                if (selectedItem != null && selectedItem == glyphItem)
                {
                    // If the Selecteditem is already in editmode ... bail out
                    if (selectedItem != null)
                    {
                        ToolStripItemDesigner selectedItemDesigner = glyph.ItemDesigner;
                        if (selectedItemDesigner != null && selectedItemDesigner.IsEditorActive)
                        {
                            return(false);
                        }
                    }

                    // Check if this is CTRL + Click or SHIFT + Click, if so then just remove the selection
                    bool removeSel = (Control.ModifierKeys & (Keys.Control | Keys.Shift)) > 0;
                    if (removeSel)
                    {
                        selSvc.SetSelectedComponents(new IComponent[] { selectedItem }, SelectionTypes.Remove);
                        return(false);
                    }

                    //start Double Click Timer
                    // This is required for the second down in selection which can be the first down of a Double click on the glyph confusing... hence this comment ...
                    // Heres the scenario ....
                    // DOWN 1 - selects the ITEM
                    // DOWN 2 - ITEM goes into INSITU....
                    // DOUBLE CLICK - dont show code..
                    // Open INSITU after the double click time
                    if (selectedItem is ToolStripMenuItem)
                    {
                        _timer = new Timer
                        {
                            Interval = SystemInformation.DoubleClickTime
                        };
                        _timer.Tick   += new EventHandler(OnDoubleClickTimerTick);
                        _timer.Enabled = true;
                        _selectedGlyph = glyph;
                    }
                }
                else
                {
                    bool shiftPressed = (Control.ModifierKeys & Keys.Shift) > 0;
                    // We should process MouseDown only if we are not yet selected....
                    if (!selSvc.GetComponentSelected(glyphItem))
                    {
                        //Reset the State... On the Glpyhs .. we get MouseDown - Mouse UP (for single Click) And we get MouseDown - MouseUp - DoubleClick - Up (for double Click) Hence reset the state at start....
                        _mouseUpFired     = false;
                        _doubleClickFired = false;
                        //Implementing Shift + Click....
                        // we have 2 items, namely, selectedItem (current PrimarySelection) and glyphItem (item which has received mouseDown) FIRST check if they have common parent...  IF YES then get the indices of the two and SELECT all items from LOWER index to the HIGHER index.
                        if (shiftPressed && (selectedItem != null && CommonParent(selectedItem, glyphItem)))
                        {
                            ToolStrip parent = null;
                            if (glyphItem.IsOnOverflow)
                            {
                                parent = glyphItem.Owner;
                            }
                            else
                            {
                                parent = glyphItem.GetCurrentParent();
                            }
                            int startIndexOfSelection = Math.Min(parent.Items.IndexOf(selectedItem), parent.Items.IndexOf(glyphItem));
                            int endIndexOfSelection   = Math.Max(parent.Items.IndexOf(selectedItem), parent.Items.IndexOf(glyphItem));
                            int countofItemsSelected  = (endIndexOfSelection - startIndexOfSelection) + 1;

                            // if two adjacent items are selected ...
                            if (countofItemsSelected == 2)
                            {
                                selSvc.SetSelectedComponents(new IComponent[] { glyphItem });
                            }
                            else
                            {
                                object[] totalObjects = new object[countofItemsSelected];
                                int      j            = 0;
                                for (int i = startIndexOfSelection; i <= endIndexOfSelection; i++)
                                {
                                    totalObjects[j++] = parent.Items[i];
                                }
                                selSvc.SetSelectedComponents(new IComponent[] { parent }, SelectionTypes.Replace);
                                ToolStripDesigner.s_shiftState = true;
                                selSvc.SetSelectedComponents(totalObjects, SelectionTypes.Replace);
                            }
                        }
                        //End Implmentation
                        else
                        {
                            if (glyphItem.IsOnDropDown && ToolStripDesigner.s_shiftState)
                            {
                                //Invalidate glyh only if we are in ShiftState...
                                ToolStripDesigner.s_shiftState = false;
                                if (bSvc != null)
                                {
                                    bSvc.Invalidate(glyphItem.Owner.Bounds);
                                }
                            }
                            selSvc.SetSelectedComponents(new IComponent[] { glyphItem }, SelectionTypes.Auto);
                        }
                        // Set the appropriate object.
                        if (keyService != null)
                        {
                            keyService.ShiftPrimaryItem = glyphItem;
                        }
                    }
                    // we are already selected and if shiftpressed...
                    else if (shiftPressed || (Control.ModifierKeys & Keys.Control) > 0)
                    {
                        selSvc.SetSelectedComponents(new IComponent[] { glyphItem }, SelectionTypes.Remove);
                    }
                }
            }

            if (glyph != null && button == MouseButtons.Right)
            {
                if (!selSvc.GetComponentSelected(glyphItem))
                {
                    selSvc.SetSelectedComponents(new IComponent[] { glyphItem });
                }
            }

            // finally Invalidate all selections
            ToolStripDesignerUtils.InvalidateSelection(origSel, glyphItem, glyphItem.Site, false);
            return(false);
        }
        public override bool OnMouseDown(Glyph g, MouseButtons button, Point mouseLoc)
        {
            ToolStripItemGlyph glyph            = g as ToolStripItemGlyph;
            ToolStripItem      item             = glyph.Item;
            ISelectionService  selectionService = this.GetSelectionService(item);
            BehaviorService    behaviorService  = this.GetBehaviorService(item);
            ToolStripKeyboardHandlingService keyBoardHandlingService = this.GetKeyBoardHandlingService(item);

            if (((button != MouseButtons.Left) || (keyBoardHandlingService == null)) || (!keyBoardHandlingService.TemplateNodeActive || !keyBoardHandlingService.ActiveTemplateNode.IsSystemContextMenuDisplayed))
            {
                IDesignerHost service          = (IDesignerHost)item.Site.GetService(typeof(IDesignerHost));
                ToolStripItem primarySelection = selectionService.PrimarySelection as ToolStripItem;
                ICollection   c = null;
                if (selectionService != null)
                {
                    c = selectionService.GetSelectedComponents();
                }
                ArrayList originalSelComps = new ArrayList(c);
                if (((originalSelComps.Count == 0) && (keyBoardHandlingService != null)) && (keyBoardHandlingService.SelectedDesignerControl != null))
                {
                    originalSelComps.Add(keyBoardHandlingService.SelectedDesignerControl);
                }
                if (keyBoardHandlingService != null)
                {
                    keyBoardHandlingService.SelectedDesignerControl = null;
                    if (keyBoardHandlingService.TemplateNodeActive)
                    {
                        keyBoardHandlingService.ActiveTemplateNode.CommitAndSelect();
                        if ((primarySelection != null) && (primarySelection == item))
                        {
                            selectionService.SetSelectedComponents(null, SelectionTypes.Replace);
                        }
                    }
                }
                if ((selectionService == null) || this.MouseHandlerPresent(item))
                {
                    return(false);
                }
                if ((glyph != null) && (button == MouseButtons.Left))
                {
                    ToolStripItem oldSelection = selectionService.PrimarySelection as ToolStripItem;
                    this.SetParentDesignerValuesForDragDrop(item, true, mouseLoc);
                    if ((oldSelection != null) && (oldSelection == item))
                    {
                        if (oldSelection != null)
                        {
                            ToolStripItemDesigner itemDesigner = glyph.ItemDesigner;
                            if ((itemDesigner != null) && itemDesigner.IsEditorActive)
                            {
                                return(false);
                            }
                        }
                        if ((Control.ModifierKeys & (Keys.Control | Keys.Shift)) > Keys.None)
                        {
                            selectionService.SetSelectedComponents(new IComponent[] { oldSelection }, SelectionTypes.Remove);
                            return(false);
                        }
                        if (oldSelection is ToolStripMenuItem)
                        {
                            this._timer          = new Timer();
                            this._timer.Interval = SystemInformation.DoubleClickTime;
                            this._timer.Tick    += new EventHandler(this.OnDoubleClickTimerTick);
                            this._timer.Enabled  = true;
                            this.selectedGlyph   = glyph;
                        }
                    }
                    else
                    {
                        bool flag2 = (Control.ModifierKeys & Keys.Shift) > Keys.None;
                        if (!selectionService.GetComponentSelected(item))
                        {
                            this.mouseUpFired     = false;
                            this.doubleClickFired = false;
                            if ((flag2 && (oldSelection != null)) && this.CommonParent(oldSelection, item))
                            {
                                ToolStrip owner = null;
                                if (item.IsOnOverflow)
                                {
                                    owner = item.Owner;
                                }
                                else
                                {
                                    owner = item.GetCurrentParent();
                                }
                                int num  = Math.Min(owner.Items.IndexOf(oldSelection), owner.Items.IndexOf(item));
                                int num2 = Math.Max(owner.Items.IndexOf(oldSelection), owner.Items.IndexOf(item));
                                int num3 = (num2 - num) + 1;
                                if (num3 == 2)
                                {
                                    selectionService.SetSelectedComponents(new IComponent[] { item });
                                }
                                else
                                {
                                    object[] components = new object[num3];
                                    int      num4       = 0;
                                    for (int i = num; i <= num2; i++)
                                    {
                                        components[num4++] = owner.Items[i];
                                    }
                                    selectionService.SetSelectedComponents(new IComponent[] { owner }, SelectionTypes.Replace);
                                    ToolStripDesigner.shiftState = true;
                                    selectionService.SetSelectedComponents(components, SelectionTypes.Replace);
                                }
                            }
                            else
                            {
                                if (item.IsOnDropDown && ToolStripDesigner.shiftState)
                                {
                                    ToolStripDesigner.shiftState = false;
                                    if (behaviorService != null)
                                    {
                                        behaviorService.Invalidate(item.Owner.Bounds);
                                    }
                                }
                                selectionService.SetSelectedComponents(new IComponent[] { item }, SelectionTypes.Auto);
                            }
                            if (keyBoardHandlingService != null)
                            {
                                keyBoardHandlingService.ShiftPrimaryItem = item;
                            }
                        }
                        else if (flag2 || ((Control.ModifierKeys & Keys.Control) > Keys.None))
                        {
                            selectionService.SetSelectedComponents(new IComponent[] { item }, SelectionTypes.Remove);
                        }
                    }
                }
                if (((glyph != null) && (button == MouseButtons.Right)) && !selectionService.GetComponentSelected(item))
                {
                    selectionService.SetSelectedComponents(new IComponent[] { item });
                }
                ToolStripDesignerUtils.InvalidateSelection(originalSelComps, item, item.Site, false);
            }
            return(false);
        }