scrolldemoview.cpp

编程 滚动条的设计代码 可供初学者参考使用

// ScrollDemoView.cpp : implementation of the CScrollDemoView class
//

#include "stdafx.h"
#include "ScrollDemo.h"

#include "ScrollDemoDoc.h"
#include "ScrollDemoView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CScrollDemoView

IMPLEMENT_DYNCREATE(CScrollDemoView, CScrollView)

BEGIN_MESSAGE_MAP(CScrollDemoView, CScrollView)
	//{{AFX_MSG_MAP(CScrollDemoView)
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScrollDemoView construction/destruction

CScrollDemoView::CScrollDemoView()
{
	// 设置字体
	m_font.CreatePointFont (80, _T ("MS Sans Serif"));
}

CScrollDemoView::~CScrollDemoView()
{
}

BOOL CScrollDemoView::PreCreateWindow(CREATESTRUCT& cs)
{
	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CScrollDemoView drawing

void CScrollDemoView::OnDraw(CDC* pDC)
{
	CScrollDemoDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	
    //
    // 画表格线.
    //
	
	// 获得视的逻辑宽度与高度
	CSize size = GetTotalSize();
	
	// 设置画笔
    CPen pen(PS_SOLID, 0, RGB(192, 192, 192));
	// 将创建的画笔选入设备环境，并保存原有画笔
    CPen* pOldPen = pDC->SelectObject(&pen);
	
    // 画表格横线
	for (int i = 0; i < 99; i++)
	{
        int y = (i * m_nCellHeight) + m_nCellHeight;
        pDC->MoveTo(0, y);
        pDC->LineTo(size.cx, y);
    }
	
	// 画表格竖线
	for (int j = 0; j < 26; j++)
	{
        int x = (j * m_nCellWidth) + m_nRibbonWidth;
        pDC->MoveTo(x, 0);
        pDC->LineTo(x, size.cy);
    }
	
    // 恢复旧画笔
	pDC->SelectObject(pOldPen);
    
    //
    // 绘制行/列表头.
    //
    // 创建画刷
	CBrush brush;
    brush.CreateStockObject(LTGRAY_BRUSH);
	
    // 绘制行表头
	CRect rcTop(0, 0, size.cx, m_nCellHeight);
    pDC->FillRect(rcTop, &brush);
    // 绘制列表头
	CRect rcLeft(0, 0, m_nRibbonWidth, size.cy);
    pDC->FillRect(rcLeft, &brush);
	
    // 绘制行表头横线
	pDC->MoveTo(0, m_nCellHeight);
    pDC->LineTo(size.cx, m_nCellHeight);
	// 绘制列表头竖线
	pDC->MoveTo(m_nRibbonWidth, 0);
    pDC->LineTo(m_nRibbonWidth, size.cy);
	
    // 设置背景混合模式为透明模式
	pDC->SetBkMode(TRANSPARENT);
	
    //
    // 绘制列表头的按钮样式并添加数字
    //
    for(i = 0; i < 99; i++)
	{
        int y = (i * m_nCellHeight) + m_nCellHeight;
        pDC->MoveTo(0, y);
        pDC->LineTo(m_nRibbonWidth, y);
		
        CString string;
        string.Format(_T ("%d"), i + 1);
		
        CRect rect (0, y, m_nRibbonWidth, y + m_nCellHeight);
        // 输出文本
		pDC->DrawText(string, &rect, DT_SINGLELINE |
            DT_CENTER | DT_VCENTER);
		
        rect.top++;
		
		// 绘制三维矩形
        pDC->Draw3dRect(rect, RGB(255, 255, 255),
            RGB(128, 128, 128));
    }
	
    //
    // 绘制行表头的按钮样式并添加字母
    //
    for (j=0; j<26; j++)
	{
        int x = (j * m_nCellWidth) + m_nRibbonWidth;
        pDC->MoveTo(x, 0);
        pDC->LineTo(x, m_nCellHeight);
		
        CString string;
        string.Format(_T ("%c"), j + 'A');
		
        CRect rect (x, 0, x + m_nCellWidth, m_nCellHeight);
        // 输出文本
		pDC->DrawText (string, &rect, DT_SINGLELINE |
            DT_CENTER | DT_VCENTER);
		
        rect.left++;
		// 绘制三维矩形
        pDC->Draw3dRect(rect, RGB(255, 255, 255),
            RGB(128, 128, 128));
    }
	
	//
	// 绘制每个单元格的编号
	//
	CRect rect;
	pDC->GetClipBox (&rect);
	int nStartRow = max(0, (rect.top - m_nCellHeight) / m_nCellHeight);
	int nEndRow = min(98, (rect.bottom - 1) / m_nCellHeight);
	int nStartCol = max(0, (rect.left - m_nRibbonWidth) / m_nCellWidth);
	int nEndCol = min(25, ((rect.right + m_nCellWidth - 1) -
		m_nRibbonWidth) / m_nCellWidth);
	
	for (i = nStartRow; i <= nEndRow; i++)
		for (j = nStartCol; j <= nEndCol; j++)
			DrawAddress(pDC, i, j);
		
		//
		// 绘制选中单元格的颜色.
		//
		DrawPointer(pDC, m_nCurrentRow, m_nCurrentCol, TRUE);
}

void CScrollDemoView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();
	
	// 初始化成员
	m_nCurrentRow = 0;
	m_nCurrentCol = 0;
	m_bSmooth = FALSE;
	
    // 获得客户区设备上下文
	CClientDC dc(this);
	
    // 获得每英寸像素点数
	m_nCellWidth = dc.GetDeviceCaps(LOGPIXELSX);
    m_nCellHeight = dc.GetDeviceCaps(LOGPIXELSY) / 4;
    m_nRibbonWidth = m_nCellWidth / 2;
	
    int nWidth = (26 * m_nCellWidth) + m_nRibbonWidth;
    int nHeight = m_nCellHeight * 100;
	
	// 初始化滚动尺寸
	SetScrollSizes (MM_TEXT, CSize (nWidth, nHeight));
}

/////////////////////////////////////////////////////////////////////////////
// CScrollDemoView diagnostics

#ifdef _DEBUG
void CScrollDemoView::AssertValid() const
{
	CScrollView::AssertValid();
}

void CScrollDemoView::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

CScrollDemoDoc* CScrollDemoView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CScrollDemoDoc)));
	return (CScrollDemoDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CScrollDemoView message handlers

void CScrollDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CScrollView::OnLButtonDown(nFlags, point);
	
	//
	// 将当前点的坐标转换为逻辑坐标
	//
	CPoint pos = point;
	CClientDC dc(this);
	//
	// 让MFC在输出中考虑映射模式和滚动位置的影响
	//
	OnPrepareDC(&dc);
	dc.DPtoLP(&pos);
	
	//
	// 若击中某一单元格，移动单元格指示颜色到击中的单元格
	//
	CSize size = GetTotalSize();
	if (pos.x > m_nRibbonWidth && pos.x < size.cx &&
		pos.y > m_nCellHeight && pos.y < size.cy)
	{
		int row = (pos.y - m_nCellHeight) / m_nCellHeight;
		int col = (pos.x - m_nRibbonWidth) / m_nCellWidth;
		ASSERT (row >= 0 && row <= 98 && col >= 0 && col <= 25);
		
		DrawPointer(&dc, m_nCurrentRow, m_nCurrentCol, FALSE);
		m_nCurrentRow = row;
		m_nCurrentCol = col;
		DrawPointer(&dc, m_nCurrentRow, m_nCurrentCol, TRUE);
	}
}

void CScrollDemoView::DrawPointer(CDC *pDC, int row, int col, BOOL bHighlight)
{
	CRect rect;
	// 获得单元格矩形大小
	GetCellRect(row, col, &rect);

	// 创建画刷
	CBrush brush(bHighlight ? RGB(0, 255, 255) : ::GetSysColor(COLOR_WINDOW));
	// 绘制矩形
	pDC->FillRect(rect, &brush);
	// 绘制单元格编号
	DrawAddress(pDC, row, col);
}

void CScrollDemoView::DrawAddress(CDC *pDC, int row, int col)
{
	CRect rect;
	// 获得单元格矩形大小
	GetCellRect(row, col, &rect);
	
	// 创建单元格编号字符串
	CString string;
	string.Format(_T ("%c%d"), col + _T ('A'), row + 1);
	
	// 设置透明模式
	pDC->SetBkMode(TRANSPARENT);

	// 选入字体
	CFont* pOldFont = pDC->SelectObject(&m_font);
	// 输出字符串
	pDC->DrawText(string, rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
	// 恢复原字体
	pDC->SelectObject(pOldFont);
}

// 获得单元格所在的矩形位置
void CScrollDemoView::GetCellRect(int row, int col, LPRECT pRect)
{
	pRect->left = m_nRibbonWidth + (col * m_nCellWidth) + 1;
	pRect->top = m_nCellHeight + (row * m_nCellHeight) + 1;
	pRect->right = pRect->left + m_nCellWidth - 1;
	pRect->bottom = pRect->top + m_nCellHeight - 1;
}