vc 按钮自绘

按钮自绘，将按钮区域分成三部分，左边、右边、中间都由贴图绘制，可用于手动进度条按钮，或者左右选择项按钮

cpp代码部分：

 

// LRSkinButton.cpp : implementation file
//

#include "stdafx.h"
#include "CRedrawButtonDemo.h"
#include "LRSkinButton.h"

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

/////////////////////////////////////////////////////////////////////////////
// CLRSkinButton

CLRSkinButton::CLRSkinButton()
{
    m_nWidth = 17;
    m_nHeight = 16;
    m_bDrawBorder = TRUE;
}

CLRSkinButton::~CLRSkinButton()
{
}


BEGIN_MESSAGE_MAP(CLRSkinButton, CButton)
    //{{AFX_MSG_MAP(CLRSkinButton)
        // NOTE - the ClassWizard will add and remove mapping macros here.
    //}}AFX_MSG_MAP
    ON_WM_CAPTURECHANGED()
    ON_WM_MOUSEMOVE()
    ON_WM_SETCURSOR()
    ON_WM_KILLFOCUS()
END_MESSAGE_MAP()

void CLRSkinButton::DrawItem( LPDRAWITEMSTRUCT lpDrawItemStruct )
{
//  TRACE("DrawItem\n");

    // TODO:  添加您的代码以绘制指定项
    CDC* pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
    HDC hDC = pDC->GetSafeHdc();
    // 按钮客户区域
    CRect rectItem(lpDrawItemStruct->rcItem);
    m_nHeight = rectItem.Height();
    m_nWidth = 26;
    CRect rectCenter(rectItem.left+m_nWidth, rectItem.top, rectItem.right-m_nWidth, rectItem.bottom);
    CRect rectLeft(rectItem.left, rectItem.top, rectItem.left+m_nWidth, rectItem.top+m_nHeight);
    CRect rectRight(rectItem.right-m_nWidth,rectItem.top,rectItem.right,rectItem.bottom);
    static int nClrWidth = rectCenter.Width()/10;
    CRect rectColor(rectCenter.left, rectCenter.top, rectCenter.left, rectCenter.bottom);
    rectCenter.DeflateRect(0,1,0,1);
//  pDC->SetBkMode(TRANSPARENT);

    HPEN hOldPen;
    UINT action, state;
    action = lpDrawItemStruct->itemAction;
    state  = lpDrawItemStruct->itemState;

    BOOL bIsPressed, bIsFocus, bIsDisabled;
    bIsPressed = state & ODS_SELECTED;
    bIsDisabled = state & ODS_DISABLED;
    bIsFocus = (state & ODS_FOCUS) == ODS_FOCUS; // ::GetFocus() == m_hWnd;

    ::SetBkColor(hDC, RGB(22, 33, 55));
    // Draw pressed button
    if (bIsPressed)
    {// 按钮按下状态
        /*
        HPEN penBtnHiLight = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_3DHILIGHT));//COLOR_3DLIGHT)); // Bianco
        HPEN penBtnShadow = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_3DSHADOW));   // Grigio scuro

        // draw darkline of left-top conner
        hOldPen = (HPEN)SelectObject(hDC,penBtnShadow);
        MoveToEx(hDC,rectItem.left, rectItem.bottom-1,NULL);
        LineTo(hDC,rectItem.left, rectItem.top);
        LineTo(hDC,rectItem.right, rectItem.top);
        // draw hilight line of right-bottom conner
        SelectObject(hDC,penBtnHiLight);
        MoveToEx(hDC,rectItem.left, rectItem.bottom-1,NULL);
        LineTo(hDC,rectItem.right-1, rectItem.bottom-1);
        LineTo(hDC,rectItem.right-1, rectItem.top-1);
        //release resource
        SelectObject(hDC,hOldPen);
        DeleteObject(penBtnShadow);
        DeleteObject(penBtnHiLight);
        */

        // 判断点击的是左区域还是右区域
        POINT pos;
        GetCursorPos( &pos );
        ScreenToClient(&pos);
        if (PtInRect( &rectLeft, pos))
        {// 左键
            TRACE(_T("Clicked Left...\n"));
            nClrWidth -= 5;
            if (nClrWidth <=0)
            {
                nClrWidth = 0;
            }
        }
        if (PtInRect( &rectRight, pos))
        {// 右键
            TRACE(_T("Clicked Right...\n"));
            nClrWidth += 5;
            if (nClrWidth >= rectCenter.Width())
            {
                nClrWidth = rectCenter.Width();
            }
        }

    }
    else // ...else draw non pressed button
    {
        if(!m_bIsFlat || (m_bIsFlat && m_MouseOnButton))
        {// 鼠标移动到按钮上面时的状态
            /*
            HPEN pen3DLight = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_3DHILIGHT));//COLOR_3DLIGHT));       // Light gray
            HPEN penBtnShadow = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_3DSHADOW));   // Dark gray
            // White line
            hOldPen = (HPEN)SelectObject(hDC,pen3DLight);
            MoveToEx(hDC,rectItem.left, rectItem.bottom-1,NULL);
            LineTo(hDC,rectItem.left, rectItem.top);
            LineTo(hDC,rectItem.right, rectItem.top);
            // Dark gray line
            SelectObject(hDC,penBtnShadow);
            MoveToEx(hDC,rectItem.left, rectItem.bottom-1,NULL);
            LineTo(hDC,rectItem.right-1, rectItem.bottom-1);
            LineTo(hDC,rectItem.right-1, rectItem.top-1);
            //
            SelectObject(hDC,hOldPen);
            DeleteObject(pen3DLight);
            DeleteObject(penBtnShadow);
            */
        }
        else{// FLAT 属性
            if(m_bDrawBorder)
            { // 失去焦点的时候绘制按钮边框
                HPEN penBorder = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNTEXT));
                hOldPen = (HPEN)SelectObject(hDC,penBorder);
                SelectObject(hDC,GetStockObject(NULL_BRUSH));
                // 绘制按钮边框
                Rectangle(hDC,rectItem.left, rectItem.top, rectItem.right, rectItem.bottom);
                SelectObject(hDC, hOldPen);
                DeleteObject(penBorder);
            }
        }
    }

//  if (lpDrawItemStruct->itemData != NULL)
//  {
        // 画图标
        CRect rect(rectCenter);
    //  rect.DeflateRect(0,5,0,0); // 改变矩形范围
        CDC dcMem;
        dcMem.CreateCompatibleDC(pDC);

        // 背景图
        CBitmap bmp;
        BITMAP bitmap;

        bmp.LoadBitmap(m_nBmpBK);
        bmp.GetBitmap( &bitmap );
        CBitmap* pOldBmp = dcMem.SelectObject(&bmp);
        pDC->StretchBlt(rectCenter.left, rectCenter.top, rectCenter.Width(), rectCenter.Height(), &dcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, SRCCOPY);
        bmp.DeleteObject();

        // 左按钮图
        bmp.LoadBitmap( m_nBmpLeft );
        dcMem.SelectObject( &bmp );
        bmp.GetBitmap( &bitmap );
    //  pDC->BitBlt(rectLeft.left,rectLeft.top,rectLeft.Width(),rectLeft.Height(),&dcMem,0,0,SRCCOPY);
        pDC->StretchBlt(rectLeft.left, rectLeft.top, rectLeft.Width(), rectLeft.Height(), &dcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, SRCCOPY);
        bmp.DeleteObject();

        // 右按钮图
        bmp.LoadBitmap( m_nBmpRight );
        bmp.GetBitmap( &bitmap );
        dcMem.SelectObject( &bmp );
    //  pDC->BitBlt(rectRight.left,rectRight.top,rectRight.Width(),rectRight.Height(),&dcMem,0,0,SRCCOPY);
        pDC->StretchBlt(rectRight.left, rectRight.top, rectRight.Width(), rectRight.Height(), &dcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, SRCCOPY);
        bmp.DeleteObject();
        dcMem.SelectObject(pOldBmp);

        // 绘制颜色进度条
        bmp.LoadBitmap(IDB_BMP_BTNLEFT);
    //  CBrush brush(&bmp);   //RGB(255, 255, 0)
        CBrush brush(RGB(255, 255, 0));   //
        rectColor.right = rectColor.left+nClrWidth;
        pDC->FillRect(rectColor, &brush);
//      CBrush *pOldBrush = (CBrush*)pDC->SelectObject(&brush);
//      pDC->Rectangle(&rectColor);
//      pDC->SelectObject(pOldBrush);
        bmp.DeleteObject();

        // 绘制文字
        rect = rectCenter;
        //  rect.DeflateRect(0,5,0,0);  // 调整矩形大小
        rect.InflateRect(0,1,0,1);
        pDC->SetTextColor(RGB(0,0,0));
//      rect.OffsetRect(2,1); // 平行移动矩形位置

        //  char zsCaption[64] = {0};
        CString str;
        GetWindowText( str );
        COLORREF clr = GetSysColor( COLOR_3DHILIGHT);
        clr = RGB(55, 155, 55);
        if (bIsPressed)
        {
            clr = RGB(155, 55, 55);
        }
        else if (bIsFocus /*|| m_MouseOnButton*/)
        {
            clr = RGB(55, 55, 155);

            HPEN penBorder = CreatePen(PS_SOLID, 1, RGB(255,0,255));
            hOldPen = (HPEN)SelectObject(hDC,penBorder);
            SelectObject(hDC,GetStockObject(NULL_BRUSH));
            // 绘制按钮边框
            Rectangle(hDC,rect.left, rect.top, rect.right, rect.bottom);
            SelectObject(hDC, hOldPen);
            DeleteObject(penBorder);
        }
        pDC->SetBkColor(clr);
        pDC->SetTextColor( RGB(255, 0, 0) );
        pDC->DrawText(str, str.GetLength(),rect, DT_CENTER | DT_VCENTER| DT_SINGLELINE);

//  }


}

void CLRSkinButton::SetBtnBmps( UINT uBmpBK, UINT uBmpLeft, UINT uBmpRight )
{
    m_nBmpBK = uBmpBK;
    m_nBmpLeft = uBmpLeft;
    m_nBmpRight = uBmpRight;
}

void CLRSkinButton::PreSubclassWindow()
{
    UINT nBS = GetButtonStyle();
    if(nBS & BS_DEFPUSHBUTTON)
        m_bDefaultBtn = TRUE;
    else
        m_bDefaultBtn = FALSE;
    SetButtonStyle(nBS | BS_OWNERDRAW);

    CButton::PreSubclassWindow();
}
/////////////////////////////////////////////////////////////////////////////
// CLRSkinButton message handlers
void CLRSkinButton::OnCaptureChanged(CWnd *pWnd)
{
    if(m_MouseOnButton == TRUE)
    {
        ReleaseCapture();
        Invalidate();
    }

    CButton::OnCaptureChanged(pWnd);
}

void CLRSkinButton::OnMouseMove(UINT nFlags, CPoint point)
{
    CButton::OnMouseMove(nFlags, point);

    HWND hParent; // Finestra che contiene il bottone

    // If the mouse enter the button with the left button pressed then do nothing
    if (nFlags & MK_LBUTTON && !m_MouseOnButton)
        return;

    // If our button is not flat then do nothing
    if (m_bIsFlat)
    {
        hParent = ::GetParent(m_hWnd);
        if ((::GetCapture() != m_hWnd) &&   (hParent != NULL))
        {
            m_MouseOnButton = TRUE;
            SetCapture();
            Invalidate();
        }
        else
        {
            RECT rc;
            GetClientRect(&rc);
            if (!PtInRect(&rc,point))
            {
                // Redraw only if mouse goes out
                if (m_MouseOnButton == TRUE)
                {
                    m_MouseOnButton = FALSE;
                    Invalidate();
                }
                // If user is NOT pressing left button then release capture!
                if (!(nFlags & MK_LBUTTON))
                    ReleaseCapture();
            }
        }
    }
}

BOOL CLRSkinButton::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
    if (m_hBtnCursor != NULL)
    {
        ::SetCursor(m_hBtnCursor);
        return TRUE;
    }

    return CButton::OnSetCursor(pWnd, nHitTest, message);
}

void CLRSkinButton::OnKillFocus(CWnd* pNewWnd)
{
    CButton::OnKillFocus(pNewWnd);

    if(!m_bIsFlat)
    {
        m_MouseOnButton = FALSE;
        Invalidate();
    }
}