三、程序代码
//////////////////////////////////////////////////////////////CBSColorComboBox类的头文件；
#if !defined(_BS_BSCOLORCB)
#define _BS_BSCOLORCB
#include <afxtempl.h>
//系统常用颜色的自定义名称
const static char* strColorName[] =
{
"crSCROLLBAR","crBACKGROUND","crACTIVECAPTION", "crINACTIVECAPTION", "crMENU", "crWINDOW", "crWINDOWFRAME", "crMENUTEXT", "crWINDOWTEXT", "crCAPTIONTEXT", "crACTIVEBORDER","crINACTIVEBORDER", "crAPPWORKSPACE", "crHIGHLIGHT", "crHIGHLIGHTTEXT", "crBTNFACE", "crBTNSHADOW", "crGRAYTEXT", "crBTNTEXT", "crINACTIVECAPTIONTEXT",
"crBTNHIGHLIGHT","cr3DDKSHADOW", "cr3DLIGHT", "crINFOTEXT", "crINFOBK",
"crHOTLIGHT","crGRADIENTACTIVECAPTION", crGRADIENTINACTIVECAPTION"
};
typedef struct BSCBITEM
{
int iIndex;
COLORREF crColor;
LPCTSTR lpCaption;
}BSCBITEM, *LPBSCBITEM;
class CBSColorComboBox : public CComboBox
{
DECLARE_DYNCREATE(CBSColorComboBox)
public:
CBSColorComboBox();
virtual ~CBSColorComboBox();
BOOL Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID);
//初始化组合框(第一个被调用的函数)
void InitBSColorCB(void);
//得到当前的颜色值或R/G/B值
COLORREF GetColor();
void GetRGBValue(int* R, int* G, int* B);
public:
//{{AFX_VIRTUAL(CBSColorComboBox)
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);
//}}AFX_VIRTUAL
protected:
bool m_bOverControl; //鼠标的状态(是否处于按钮上)
int iIconX, iIconY; //SMALL ICON的大小尺寸
COLORREF m_crColor; //当前选中的颜色
CList<LPBSCBITEM, LPBSCBITEM> m_crItem;
void OnCBPaint(CDC* pDC);
LPBSCBITEM GetItem(int iIndex = 0);
protected:
//{{AFX_MSG(CBSColorComboBox)
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
afx_msg void OnPaint();
afx_msg void OnTimer(UINT nIDEvent);
afx_msg void OnMouseMove(UINT nFlags, CPoint point);
afx_msg void OnSelchange();
afx_msg void OnSelendok();
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
};
#endif // !defined(_BS_BSCOLORCB)
///////////////////////////////////////////////////////////////CBSColorComboBox的实现文件；
#include "stdafx.h"
#include "BSColorComboBox.h"
CBSColorComboBox::CBSColorComboBox()
{
//当前鼠标是否在对象上
m_bOverControl = false;
//小图标尺寸
iIconX = ::GetSystemMetrics(SM_CXSMICON);
iIconY = ::GetSystemMetrics(SM_CYSMICON);
}
CBSColorComboBox::~CBSColorComboBox()
{
while(!m_crItem.IsEmpty())
{
LPBSCBITEM lpItem = m_crItem.RemoveHead();
delete lpItem;
}
}
BOOL CBSColorComboBox::Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID)
{
DWORD dw = dwStyle;
if( !CComboBox::Create(dw, rect, pParentWnd, nID) )
return false;
CFont * font = CFont::FromHandle((HFONT)::GetStockObject(DEFAULT_GUI_FONT));
SetFont(font);
return true;
}
IMPLEMENT_DYNCREATE(CBSColorComboBox, CComboBox)
BEGIN_MESSAGE_MAP(CBSColorComboBox, CComboBox)
//{{AFX_MSG_MAP(CBSColorComboBox)
ON_WM_ERASEBKGND()
ON_WM_PAINT()
ON_WM_TIMER()
ON_WM_MOUSEMOVE()
ON_CONTROL_REFLECT(CBN_SELCHANGE, OnSelchange)
ON_CONTROL_REFLECT(CBN_SELENDOK, OnSelendok)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
void CBSColorComboBox::InitBSColorCB(void)
{
int iMinColor = COLOR_SCROLLBAR,
iMaxColor = COLOR_BTNHIGHLIGHT;
if(WINVER >= 0x0400)
iMaxColor = COLOR_INFOBK;
if(WINVER >= 0x0500)
iMaxColor = 28;
//初始化CB颜色列表框的Item(常见的SysColor值)
for(int iLoop = iMinColor; iLoop <= iMaxColor; ++iLoop)
{
LPBSCBITEM lpItem = new BSCBITEM;
lpItem->iIndex = AddString(strColorName[iLoop]);
lpItem->crColor = ::GetSysColor(iLoop);
lpItem->lpCaption = strColorName[iLoop];
//
if(m_crItem.IsEmpty())
m_crItem.AddHead(lpItem);
else
m_crItem.AddTail(lpItem);
}
//该Item是为了用户自定义颜色而设置
LPBSCBITEM lpItem = new BSCBITEM;
lpItem->iIndex = AddString("More Colors");
lpItem->crColor = RGB(213, 233, 249);
lpItem->lpCaption = "More Colors";
if(m_crItem.IsEmpty())
m_crItem.AddHead(lpItem);
else
m_crItem.AddTail(lpItem);
//初始化当前颜色
m_crColor = m_crItem.GetHead()->crColor;
}
BOOL CBSColorComboBox::OnEraseBkgnd(CDC* pDC)
{
ASSERT(pDC->GetSafeHdc());
return false;
}
void CBSColorComboBox::OnPaint()
{
CPaintDC dc(this);
OnCBPaint(&dc);
}
void CBSColorComboBox::OnCBPaint(CDC* pDC)
{
ASSERT(pDC->GetSafeHdc());
//绘制客户区
CDC dMemDC;
dMemDC.CreateCompatibleDC(pDC);
dMemDC.SetMapMode(pDC->GetMapMode());
//画动作
CBitmap mNewBmp;
RECT rc;
GetClientRect(&rc);
mNewBmp.CreateCompatibleBitmap(pDC, rc.right - rc.left, rc.bottom - rc.top);
CBitmap* pOldBmp = dMemDC.SelectObject(&mNewBmp);
//子类可以以friend方式来访问父类的protected成员变量和函数
CWnd::DefWindowProc(WM_PAINT, (WPARAM)dMemDC.m_hDC, 0);
pDC->BitBlt(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, &dMemDC,rc.left ,rc.top, SRCCOPY);
//恢复
dMemDC.SelectObject(pOldBmp);
pOldBmp->DeleteObject();
dMemDC.DeleteDC();
GetWindowRect(&rc);
ScreenToClient(&rc);
pDC->DrawEdge(&rc, (m_bOverControl ? BDR_RAISEDINNER: BDR_SUNKENINNER), BF_RECT);
}
void CBSColorComboBox::OnTimer(UINT nIDEvent)
{
if(nIDEvent == 888 && IsWindowEnabled())
{
CPoint point;
::GetCursorPos(&point);
CRect rect;
GetWindowRect(&rect);
if(rect.PtInRect(point))
{
m_bOverControl = true;
}
else
{
m_bOverControl = false;
KillTimer(nIDEvent);
}
}
CComboBox::OnTimer(nIDEvent);
}
void CBSColorComboBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
lpMeasureItemStruct->itemHeight = iIconY + 5;
}
void CBSColorComboBox::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
ASSERT(lpDIS->CtlType == ODT_COMBOBOX);
//画笔
CDC* pDC = CDC::FromHandle(lpDIS->hDC);
ASSERT(pDC->GetSafeHdc());
//绘制区
RECT rc = lpDIS->rcItem;
RECT rcIcon(rc), rcTxt(rc);
//当前的Item索引号
LPBSCBITEM lpItem = GetItem(lpDIS->itemID);
if(lpItem != NULL)
{
//画颜色Icon
rcIcon.right = rcIcon.left + iIconX;
rcIcon.top += (rc.bottom - rc.top - iIconY) / 2;
rcIcon.bottom = rcIcon.top + iIconY;
pDC->FillSolidRect(rcIcon.left, rcIcon.top,
rcIcon.right - rcIcon.left, rcIcon.bottom - rcIcon.top, lpItem->crColor);
pDC->DrawEdge(&rcIcon, BDR_RAISEDINNER, BF_RECT);
//开始画文字
int nOldBkMode = pDC->SetBkMode(TRANSPARENT);
pDC->SetTextColor(RGB(0, 0, 0));
rcTxt.left = rcIcon.right + 5;
rcTxt.top = rcIcon.top;
pDC->DrawText(lpItem->lpCaption, &rcTxt,
DT_VCENTER | DT_END_ELLIPSIS | DT_NOCLIP | DT_SINGLELINE);
pDC->SetBkMode(nOldBkMode);
}
}
void CBSColorComboBox::OnMouseMove(UINT nFlags, CPoint point)
{
m_bOverControl = true;
SetTimer(888, 100, NULL);
CComboBox::OnMouseMove(nFlags, point);
}
LPBSCBITEM CBSColorComboBox::GetItem(int iIndex)
{
//当前的Item索引号
POSITION pos = m_crItem.FindIndex(iIndex);
if(pos)
{
LPBSCBITEM lpItem = m_crItem.GetAt(pos);
ASSERT(lpItem);
return lpItem;
}
else
return (LPBSCBITEM)NULL;
}
COLORREF CBSColorComboBox::GetColor()
{
if(IsWindowEnabled())
return m_crColor;
else
{
return (m_crColor = GetItem(this->GetCurSel())->crColor);
}
}
void CBSColorComboBox::GetRGBValue(int* R, int* G, int* B)
{
*R = GetRValue((DWORD)m_crColor);
*G = GetGValue((DWORD)m_crColor);
*B = GetBValue((DWORD)m_crColor);
}
void CBSColorComboBox::OnSelchange()
{
int iIndex = GetCurSel();
if(iIndex != CB_ERR && iIndex >= 0)
{
CDC* pDC = this->GetDC();
//绘制区
RECT rc;
int iScrollX = ::GetSystemMetrics(SM_CXVSCROLL);
GetClientRect(&rc);
pDC->FillSolidRect(rc.left + 2, rc.top + 2, rc.right - rc.left - iScrollX - 4, rc.bottom - rc.top - 2,
::GetSysColor(COLOR_WINDOW));
RECT rcIcon(rc), rcTxt(rc);
//当前的Item索引号
LPBSCBITEM lpItem = GetItem(iIndex);
if(lpItem != NULL)
{
m_crColor = lpItem->crColor;
//画颜色Icon
rcIcon.left += 2;
rcIcon.right = rcIcon.left + iIconX;
rcIcon.top += (rc.bottom - rc.top - iIconY) / 2;
rcIcon.bottom = rcIcon.top + iIconY;
pDC->FillSolidRect(rcIcon.left, rcIcon.top,
rcIcon.right - rcIcon.left, rcIcon.bottom - rcIcon.top, lpItem->crColor);
pDC->DrawEdge(&rcIcon, BDR_RAISEDINNER, BF_RECT);
//开始画文字
int nOldBkMode = pDC->SetBkMode(TRANSPARENT);
pDC->SetTextColor(RGB(0, 0, 0));
rcTxt.left = rcIcon.right + 5;
rcTxt.top = rcIcon.top;
CFont* font = CFont::FromHandle((HFONT)::GetStockObject(DEFAULT_GUI_FONT));
pDC->SelectObject(font);
pDC->DrawText(lpItem->lpCaption, &rcTxt,
DT_VCENTER | DT_END_ELLIPSIS | DT_NOCLIP | DT_SINGLELINE);
pDC->SetBkMode(nOldBkMode);
}
pDC->DeleteDC();
}
}
void CBSColorComboBox::OnSelendok()
{
int iIndex = this->GetCurSel();
LPBSCBITEM lpTmpItem = GetItem(iIndex);
if(lpTmpItem != NULL)
{
if(lpTmpItem->lpCaption == "More Colors")
{
CColorDialog crDlg(RGB(255, 0, 0), CC_FULLOPEN);
int iRet = crDlg.DoModal();
if(iRet == IDOK)
{
m_crColor = crDlg.GetColor();
LPBSCBITEM lpItem = m_crItem.GetTail();
ASSERT(lpItem);
lpItem->crColor = m_crColor;
Invalidate();
}
}
}
} |
四、小结
上面的代码也适用于菜单等大多数控件的自画过程，其实本书在前面一些实例中也已经讲述了控件自画的内容，读者朋友们可以结合起来一起学习，相信一定能够把控件的自画这一内容掌握的一清二楚的。
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