drawvw.cpp

一个VC++绘图源程序

// drawvw.cpp : implementation of the CDrawView class
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.


#include "stdafx.h"
#include <afxpriv.h>

#include "drawcli.h"

#include "drawdoc.h"
#include "drawobj.h"
#include "cntritem.h"
#include "drawvw.h"

#include "drawobj.h"
#include "drawtool.h"
#include "mainfrm.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

// private clipboard format (list of Draw objects)
CLIPFORMAT CDrawView::m_cfDraw = (CLIPFORMAT)
	::RegisterClipboardFormat(_T("MFC Draw Sample"));
CLIPFORMAT CDrawView::m_cfObjectDescriptor = NULL;

/////////////////////////////////////////////////////////////////////////////
// CDrawView

IMPLEMENT_DYNCREATE(CDrawView, CScrollView)

BEGIN_MESSAGE_MAP(CDrawView, CScrollView)
	//{{AFX_MSG_MAP(CDrawView)
	ON_COMMAND(ID_OLE_INSERT_NEW, OnInsertObject)
	ON_COMMAND(ID_CANCEL_EDIT, OnCancelEdit)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONDBLCLK()
	ON_COMMAND(ID_DRAW_SELECT, OnDrawSelect)
	ON_COMMAND(ID_DRAW_ROUNDRECT, OnDrawRoundRect)
	ON_COMMAND(ID_DRAW_RECT, OnDrawRect)
	ON_COMMAND(ID_DRAW_LINE, OnDrawLine)
	ON_COMMAND(ID_DRAW_ELLIPSE, OnDrawEllipse)
	ON_UPDATE_COMMAND_UI(ID_DRAW_ELLIPSE, OnUpdateDrawEllipse)
	ON_UPDATE_COMMAND_UI(ID_DRAW_LINE, OnUpdateDrawLine)
	ON_UPDATE_COMMAND_UI(ID_DRAW_RECT, OnUpdateDrawRect)
	ON_UPDATE_COMMAND_UI(ID_DRAW_ROUNDRECT, OnUpdateDrawRoundRect)
	ON_UPDATE_COMMAND_UI(ID_DRAW_SELECT, OnUpdateDrawSelect)
	ON_UPDATE_COMMAND_UI(ID_OBJECT_MOVEBACK, OnUpdateSingleSelect)
	ON_COMMAND(ID_EDIT_SELECT_ALL, OnEditSelectAll)
	ON_COMMAND(ID_EDIT_CLEAR, OnEditClear)
	ON_UPDATE_COMMAND_UI(ID_EDIT_CLEAR, OnUpdateAnySelect)
	ON_COMMAND(ID_DRAW_POLYGON, OnDrawPolygon)
	ON_UPDATE_COMMAND_UI(ID_DRAW_POLYGON, OnUpdateDrawPolygon)
	ON_WM_SIZE()
	ON_COMMAND(ID_VIEW_GRID, OnViewGrid)
	ON_UPDATE_COMMAND_UI(ID_VIEW_GRID, OnUpdateViewGrid)
	ON_WM_ERASEBKGND()
	ON_COMMAND(ID_OBJECT_FILLCOLOR, OnObjectFillColor)
	ON_COMMAND(ID_OBJECT_LINECOLOR, OnObjectLineColor)
	ON_COMMAND(ID_OBJECT_MOVEBACK, OnObjectMoveBack)
	ON_COMMAND(ID_OBJECT_MOVEFORWARD, OnObjectMoveForward)
	ON_COMMAND(ID_OBJECT_MOVETOBACK, OnObjectMoveToBack)
	ON_COMMAND(ID_OBJECT_MOVETOFRONT, OnObjectMoveToFront)
	ON_COMMAND(ID_EDIT_COPY, OnEditCopy)
	ON_UPDATE_COMMAND_UI(ID_EDIT_COPY, OnUpdateEditCopy)
	ON_COMMAND(ID_EDIT_CUT, OnEditCut)
	ON_UPDATE_COMMAND_UI(ID_EDIT_CUT, OnUpdateEditCut)
	ON_COMMAND(ID_EDIT_PASTE, OnEditPaste)
	ON_UPDATE_COMMAND_UI(ID_EDIT_PASTE, OnUpdateEditPaste)
	ON_WM_SETFOCUS()
	ON_COMMAND(ID_VIEW_SHOWOBJECTS, OnViewShowObjects)
	ON_UPDATE_COMMAND_UI(ID_VIEW_SHOWOBJECTS, OnUpdateViewShowObjects)
	ON_COMMAND(ID_EDIT_PROPERTIES, OnEditProperties)
	ON_UPDATE_COMMAND_UI(ID_EDIT_PROPERTIES, OnUpdateEditProperties)
	ON_WM_DESTROY()
	ON_UPDATE_COMMAND_UI(ID_EDIT_SELECT_ALL, OnUpdateEditSelectAll)
	ON_WM_CREATE()
	ON_UPDATE_COMMAND_UI(ID_OBJECT_MOVEFORWARD, OnUpdateSingleSelect)
	ON_UPDATE_COMMAND_UI(ID_OBJECT_MOVETOBACK, OnUpdateSingleSelect)
	ON_UPDATE_COMMAND_UI(ID_OBJECT_MOVETOFRONT, OnUpdateSingleSelect)
	ON_WM_CONTEXTMENU()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawView construction/destruction

CDrawView::CDrawView()
{
	m_bGrid = TRUE;
	m_gridColor = RGB(0, 0, 128);
	m_bActive = FALSE;
// new
	if( m_cfObjectDescriptor == NULL )
		m_cfObjectDescriptor = (CLIPFORMAT)::RegisterClipboardFormat(_T("Object Descriptor") );
	m_prevDropEffect = DROPEFFECT_NONE;
// end new
}

CDrawView::~CDrawView()
{
}

BOOL CDrawView::PreCreateWindow(CREATESTRUCT& cs)
{
	ASSERT(cs.style & WS_CHILD);
	if (cs.lpszClass == NULL)
		cs.lpszClass = AfxRegisterWndClass(CS_DBLCLKS);
	return TRUE;
}

void CDrawView::OnActivateView(BOOL bActivate,CView* pActiveView,CView* pDeactiveView)
{
	CView::OnActivateView(bActivate, pActiveView, pDeactiveView);

	// invalidate selections when active status changes
	if (m_bActive != bActivate)
	{
		if (bActivate)  // if becoming active update as if active
			m_bActive = bActivate;
		if (!m_selection.IsEmpty())
			OnUpdate(NULL, HINT_UPDATE_SELECTION, NULL);
		m_bActive = bActivate;
	}
}

/////////////////////////////////////////////////////////////////////////////
// CDrawView drawing

void CDrawView::InvalObj(CDrawObj* pObj)
{
	CRect rect = pObj->m_position;
	DocToClient(rect);
	if (m_bActive && IsSelected(pObj))
	{
		rect.left -= 4;
		rect.top -= 5;
		rect.right += 5;
		rect.bottom += 4;
	}
	rect.InflateRect(1, 1); // handles CDrawOleObj objects

	InvalidateRect(rect, FALSE);
}

void CDrawView::OnUpdate(CView* , LPARAM lHint, CObject* pHint)
{
	switch (lHint)
	{
	case HINT_UPDATE_WINDOW:    // redraw entire window
		Invalidate(FALSE);
		break;

	case HINT_UPDATE_DRAWOBJ:   // a single object has changed
		InvalObj((CDrawObj*)pHint);
		break;

	case HINT_UPDATE_SELECTION: // an entire selection has changed
		{
			CDrawObjList* pList = pHint != NULL ?
				(CDrawObjList*)pHint : &m_selection;
			POSITION pos = pList->GetHeadPosition();
			while (pos != NULL)
				InvalObj(pList->GetNext(pos));
		}
		break;

	case HINT_DELETE_SELECTION: // an entire selection has been removed
		if (pHint != &m_selection)
		{
			CDrawObjList* pList = (CDrawObjList*)pHint;
			POSITION pos = pList->GetHeadPosition();
			while (pos != NULL)
			{
				CDrawObj* pObj = pList->GetNext(pos);
				InvalObj(pObj);
				Remove(pObj);   // remove it from this view's selection
			}
		}
		break;

	case HINT_UPDATE_OLE_ITEMS:
		{
			CDrawDoc* pDoc = GetDocument();
			POSITION pos = pDoc->GetObjects()->GetHeadPosition();
			while (pos != NULL)
			{
				CDrawObj* pObj = pDoc->GetObjects()->GetNext(pos);
				if (pObj->IsKindOf(RUNTIME_CLASS(CDrawOleObj)))
					InvalObj(pObj);
			}
		}
		break;

	default:
		ASSERT(FALSE);
		break;
	}
}

void CDrawView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
	CScrollView::OnPrepareDC(pDC, pInfo);

	// mapping mode is MM_ANISOTROPIC
	// these extents setup a mode similar to MM_LOENGLISH
	// MM_LOENGLISH is in .01 physical inches
	// these extents provide .01 logical inches

	pDC->SetMapMode(MM_ANISOTROPIC);
	pDC->SetViewportExt(pDC->GetDeviceCaps(LOGPIXELSX),
		pDC->GetDeviceCaps(LOGPIXELSY));
	pDC->SetWindowExt(100, -100);

	// set the origin of the coordinate system to the center of the page
	CPoint ptOrg;
	ptOrg.x = GetDocument()->GetSize().cx / 2;
	ptOrg.y = GetDocument()->GetSize().cy / 2;

	// ptOrg is in logical coordinates
	pDC->OffsetWindowOrg(-ptOrg.x,ptOrg.y);
}

BOOL CDrawView::OnScrollBy(CSize sizeScroll, BOOL bDoScroll)
{
	// do the scroll
	if (!CScrollView::OnScrollBy(sizeScroll, bDoScroll))
		return FALSE;

	// update the position of any in-place active item
	if (bDoScroll)
	{
		UpdateActiveItem();
		UpdateWindow();
	}
	return TRUE;
}

void CDrawView::OnDraw(CDC* pDC)
{
	CDrawDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	CDC dc;
	CDC* pDrawDC = pDC;
	CBitmap bitmap;
	CBitmap* pOldBitmap;

	// only paint the rect that needs repainting
	CRect client;
	pDC->GetClipBox(client);
	CRect rect = client;
	DocToClient(rect);

	if (!pDC->IsPrinting())
	{
		// draw to offscreen bitmap for fast looking repaints
		if (dc.CreateCompatibleDC(pDC))
		{
			if (bitmap.CreateCompatibleBitmap(pDC, rect.Width(), rect.Height()))
			{
				OnPrepareDC(&dc, NULL);
				pDrawDC = &dc;

				// offset origin more because bitmap is just piece of the whole drawing
				dc.OffsetViewportOrg(-rect.left, -rect.top);
				pOldBitmap = dc.SelectObject(&bitmap);
				dc.SetBrushOrg(rect.left % 8, rect.top % 8);

				// might as well clip to the same rectangle
				dc.IntersectClipRect(client);
			}
		}
	}

	// paint background
	CBrush brush;
	if (!brush.CreateSolidBrush(pDoc->GetPaperColor()))
		return;

	brush.UnrealizeObject();
	pDrawDC->FillRect(client, &brush);

	if (!pDC->IsPrinting() && m_bGrid)
		DrawGrid(pDrawDC);//

	pDoc->Draw(pDrawDC, this);

	if (pDrawDC != pDC)
	{
		pDC->SetViewportOrg(0, 0);
		pDC->SetWindowOrg(0,0);
		pDC->SetMapMode(MM_TEXT);
		dc.SetViewportOrg(0, 0);
		dc.SetWindowOrg(0,0);
		dc.SetMapMode(MM_TEXT);
		pDC->BitBlt(rect.left, rect.top, rect.Width(), rect.Height(),
			&dc, 0, 0, SRCCOPY);
		dc.SelectObject(pOldBitmap);
	}
	//*/
}

void CDrawView::Remove(CDrawObj* pObj)
{
	POSITION pos = m_selection.Find(pObj);
	if (pos != NULL)
		m_selection.RemoveAt(pos);
}

void CDrawView::PasteNative(COleDataObject& dataObject)
{
	// get file refering to clipboard data
	CFile* pFile = dataObject.GetFileData(m_cfDraw);
	if (pFile == NULL)
		return;

	// connect the file to the archive
	CArchive ar(pFile, CArchive::load);
	TRY
	{
		ar.m_pDocument = GetDocument(); // set back-pointer in archive

		// read the selection
		m_selection.Serialize(ar);
	}
	CATCH_ALL(e)
	{
		ar.Close();
		delete pFile;
		THROW_LAST();
	}
	END_CATCH_ALL

	ar.Close();
	delete pFile;
}

void CDrawView::PasteEmbedded(COleDataObject& dataObject, CPoint point )
{
	BeginWaitCursor();

	// paste embedded
	CDrawOleObj* pObj = new CDrawOleObj(GetInitialPosition());
	ASSERT_VALID(pObj);
	CDrawItem* pItem = new CDrawItem(GetDocument(), pObj);
	ASSERT_VALID(pItem);
	pObj->m_pClientItem = pItem;

	TRY
	{
		if (!pItem->CreateFromData(&dataObject) &&
			!pItem->CreateStaticFromData(&dataObject))
		{
			AfxThrowMemoryException();      // any exception will do
		}

		// add the object to the document
		GetDocument()->Add(pObj);
		m_selection.AddTail(pObj);
		ClientToDoc( point );
		pObj->MoveTo( CRect( point, pObj->m_extent ), this );

		// try to get initial presentation data
		pItem->UpdateLink();
		pItem->UpdateExtent();
	}
	CATCH_ALL(e)
	{
		// clean up item
		pItem->Delete();
		pObj->m_pClientItem = NULL;
		GetDocument()->Remove(pObj);
		pObj->Remove();

		AfxMessageBox(IDP_FAILED_TO_CREATE);
	}
	END_CATCH_ALL

	EndWaitCursor();
}

void CDrawView::DrawGrid(CDC* pDC)
{
	CDrawDoc* pDoc = GetDocument();

	COLORREF oldBkColor = pDC->SetBkColor(pDoc->GetPaperColor());

	CRect rect;
	rect.left = -pDoc->GetSize().cx / 2;
	rect.top = -pDoc->GetSize().cy / 2;
	rect.right = rect.left + pDoc->GetSize().cx;
	rect.bottom = rect.top + pDoc->GetSize().cy;

	// Center lines
	CPen penDash;
	penDash.CreatePen(PS_DASH, 1, m_gridColor);
	CPen* pOldPen = pDC->SelectObject(&penDash);

	pDC->MoveTo(0, rect.top);
	pDC->LineTo(0, rect.bottom);
	pDC->MoveTo(rect.left, 0);
	pDC->LineTo(rect.right, 0);

	// Major unit lines
	CPen penDot;
	penDot.CreatePen(PS_DOT, 1, m_gridColor);
	pDC->SelectObject(&penDot);

	for (int x = rect.left / 100 * 100; x < rect.right; x += 100)
	{
		if (x != 0)
		{
			pDC->MoveTo(x, rect.top);
			pDC->LineTo(x, rect.bottom);
		}
	}

	for (int y = rect.top / 100 * 100; y < rect.bottom; y += 100)