SidebarLibrary.Menus.MenuControl.OperateSubMenu C# (CSharp) Method

		internal void OperateSubMenu(DrawCommand dc, bool selectFirst, bool trackRemove)
		{
			Rectangle drawRect = dc.DrawRect;

			// Find screen positions for popup menu
			Point screenPos;

			if (_style == VisualStyle.IDE)
			{
				if (_direction == Direction.Horizontal)
					screenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Bottom - _lengthGap - 1));
				else
					screenPos = PointToScreen(new Point(dc.DrawRect.Right - _breadthGap, drawRect.Top + _boxExpandSides - 1));
			}
			else
			{
				if (_direction == Direction.Horizontal)
					screenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Bottom));
				else
					screenPos = PointToScreen(new Point(dc.DrawRect.Right, drawRect.Top));
			}

			Point aboveScreenPos;

			if (_style == VisualStyle.IDE)
			{
				if (_direction == Direction.Horizontal)
					aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Top + _lengthGap + 1));
				else
					aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Right - _breadthGap, drawRect.Bottom + _lengthGap));
			}
			else
			{
				if (_direction == Direction.Horizontal)
					aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Left + 1, drawRect.Top));
				else
					aboveScreenPos = PointToScreen(new Point(dc.DrawRect.Right, drawRect.Bottom));
			}

			int borderGap;

			// Calculate the missing gap in the PopupMenu border
			if (_direction == Direction.Horizontal)
				borderGap = dc.DrawRect.Width - _subMenuBorderAdjust;
			else
				borderGap = dc.DrawRect.Height - _subMenuBorderAdjust;

			_popupMenu = new PopupMenu();

			// Define the correct visual style based on ours
			_popupMenu.Style = this.Style;

			// Key direction when keys cause dismissal
			int returnDir = 0;

			if (dc.Chevron)
			{
				MenuCommandCollection mcc = new MenuCommandCollection();

				bool addCommands = false;

				// Generate a collection of menu commands for those not visible
				foreach(MenuCommand command in _menuCommands)
				{
					if (!addCommands && (command == _chevronStartCommand))
						addCommands = true;

					if (addCommands)
						mcc.Add(command);
				}

				// Track the popup using provided menu item collection
				_popupMenu.TrackPopup(screenPos,
									  aboveScreenPos,
									  _direction,
									  mcc,
									  borderGap,
									  selectFirst,
									  this,
									  ref returnDir);
			}
			else
			{
				// Generate event so that caller has chance to modify MenuCommand contents
				OnPopupStart(dc.MenuCommand);

				// Track the popup using provided menu item collection
				_popupMenu.TrackPopup(screenPos,
									  aboveScreenPos,
									  _direction,
									  dc.MenuCommand.MenuCommands,
									  borderGap,
									  selectFirst,
									  this,
									  ref returnDir);

				// Generate event so that caller has chance to modify MenuCommand contents
				OnPopupEnd(dc.MenuCommand);
			}

			// Remove unwanted object
			_popupMenu = null;

			// Was arrow key used to dismiss the submenu?
			if (returnDir != 0)
			{
				// Using keyboard movements means we should have the focus
				if (!_manualFocus)
				{
					_manualFocus = true;

					GrabTheFocus();
				}

				if (returnDir < 0)
				{
					// Shift selection left one
					ProcessMoveLeft(true);
				}
				else
				{
					// Shift selection right one
					ProcessMoveRight(true);
				}

				// A WM_MOUSEMOVE is generated when we open up the new submenu for
				// display, ignore this as it causes the selection to move
				_ignoreMouseMove = true;
			}
			else
			{
				// Only if the submenu was dismissed at the request of the submenu
				// should the selection mode be cancelled, otherwise keep selection mode
				if (!_dismissTransfer)
				{
					// This item is no longer selected
					_selected = false;
					_drawUpwards = false;

					// Should we stop tracking this item
					if (trackRemove)
					{
						ReturnTheFocus();

						// Unselect the current item
						_trackItem = SwitchTrackingItem(_trackItem, -1);
					}
					else
					{
						// Repaint the item
						DrawCommand(_trackItem, true);
					}
				}
				else
				{
					// Do not change _selected status
					_dismissTransfer = false;
				}
			}
		}