The SBJ MVC Framework - The Design View, Responding to Model Change

// UndoRedoListBox.cpp : implementation file
//

#include "stdafx.h"
#include "UndoRedoListBox.h"
#include "WndController.h"
#include "WndMsgHandler.h"
#include "UndoRedoBar.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif



namespace SbjCore
{
	namespace Mvc
	{
		struct UndoRedoListBoxImpl : public SbjCore::Mvc::WndController
		{
			SbjCore::Mvc::UndoRedoBar* pTheBar;
			UINT nTheID;

			class LButtonUpHandler : public SbjCore::Mvc::WndMsgHandler
			{
				virtual LRESULT OnHandleWndMsg(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
				{
					wParam;
					CPoint pt(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
					*pResult = 0;
					LRESULT lRslt = 0; // let the default process after us

					SbjCore::Mvc::UndoRedoListBoxImpl* pCtrlr = dynamic_cast<SbjCore::Mvc::UndoRedoListBoxImpl*>(GetController());

					CListBox* pListBox = dynamic_cast<CListBox*>(pCtrlr->GetWnd());

					BOOL bOutside;
					pListBox->ItemFromPoint(pt, bOutside);

					if (!bOutside)
					{
						SbjCore::Mvc::UndoRedoBar* pBar = dynamic_cast<SbjCore::Mvc::UndoRedoBar*>(pListBox->GetParent());
						ASSERT_VALID(pBar);
						if (pBar != NULL)						
						{
							pBar->DoUndo();
						}
					}
					return lRslt;
				}
			} theLButtonUpHandler;
			friend LButtonUpHandler;


			class MouseMoveHandler : public SbjCore::Mvc::WndMsgHandler
			{

				CALL_DEFAULT_FIRST() // comment out to handle message before default

					virtual LRESULT OnHandleWndMsg(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
				{
					wParam;
					CPoint pt(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
					*pResult = 1;
					LRESULT lRslt = 1;

					SbjCore::Mvc::UndoRedoListBoxImpl* pCtrlr = dynamic_cast<SbjCore::Mvc::UndoRedoListBoxImpl*>(GetController());

					CListBox* pListBox = dynamic_cast<CListBox*>(pCtrlr->GetWnd());

					BOOL bOutside;
					int nItem = pListBox->ItemFromPoint(pt, bOutside);

					if (!bOutside)
					{
						pListBox->SelItemRange (FALSE, nItem + 1, pListBox->GetCount () - 1);

						if (nItem == 0)
						{
							pListBox->SetSel(0);
						}
						else
						{
							pListBox->SelItemRange(TRUE, 0, nItem);
						}

						SbjCore::Mvc::UndoRedoBar* pBar = dynamic_cast<SbjCore::Mvc::UndoRedoBar*>(pListBox->GetParent());
						ASSERT_VALID(pBar);
						if (pBar != NULL)
						{
							pCtrlr->pTheBar->SetLabelCount(nItem + 1);
						}
					}

					return lRslt;
				}

			} theMouseMoveHandler;
			friend MouseMoveHandler;
			
			UndoRedoListBoxImpl() :
				pTheBar(NULL),
				nTheID(0)
			{
				AddHandler(WM_LBUTTONUP, &theLButtonUpHandler);
				AddHandler(WM_MOUSEMOVE, &theMouseMoveHandler);
			}
			virtual ~UndoRedoListBoxImpl()
			{
			}
		};
		
		///////////////////////////////////////////////////////////////////		
		
		UndoRedoListBox::UndoRedoListBox() :
			m_pImpl(new UndoRedoListBoxImpl)
		{
			SetController(m_pImpl);
		}

		UndoRedoListBox::~UndoRedoListBox()
		{
			try
			{
				delete m_pImpl;
			}
			catch(...)
			{
				ASSERT(FALSE);
			}
		}
		
		BOOL UndoRedoListBox::PreTranslateMessage( MSG* pMsg )
		{
			if (pMsg->message == WM_LBUTTONDOWN)
			{
				return TRUE;
			}

			return CListBox::PreTranslateMessage(pMsg);
		}
	}
}