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自绘实现半透明水晶按钮
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运行效果
1.给按钮加上BS_OWNERDRAW样式 2.重载DrawItem函数,在这里绘制按钮 3.关键之处就是把父窗口的背景复制到按钮上,实现视觉上的透明 4.最后通过AlphaBlend实现半透明. 实现源码 // MyButton.h #pragma once // CMyButton class CMyButton : public CButton { DECLARE_DYNAMIC(CMyButton) public: CMyButton(); virtual ~CMyButton(); public: void SetBkColor(COLORREF color); void SetTextColor(COLORREF color); private: bool m_bOver; bool m_bDown; bool m_bDisable; bool m_bTracking; COLORREF m_bkColor; COLORREF m_textColor; protected: DECLARE_MESSAGE_MAP() virtual BOOL PreCreateWindow(CREATESTRUCT& cs); virtual void PreSubclassWindow(); public: virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/); afx_msg void OnMouseMove(UINT nFlags, CPoint point); afx_msg void OnLButtonDown(UINT nFlags, CPoint point); afx_msg void OnLButtonUp(UINT nFlags, CPoint point); afx_msg LRESULT OnMouseLeave(WPARAM wParam, LPARAM lParam); afx_msg LRESULT OnMouseHover(WPARAM wParam, LPARAM lParam); afx_msg void OnEnable(BOOL bEnable); private: void ButtonInit(); void DrawButton(); void DrawButton(HDC hDestDC); }; // MyButton.cpp : 实现文件 // #include "stdafx.h" #include "AlphaButton.h" #include "MyButton.h" #include "MainDlg.h" // CMyButton IMPLEMENT_DYNAMIC(CMyButton, CButton) CMyButton::CMyButton() { m_bkColor=0xFFFFFF; m_textColor=0x000000; } CMyButton::~CMyButton() { } BEGIN_MESSAGE_MAP(CMyButton, CButton) ON_WM_MOUSEMOVE() ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave) ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover) ON_WM_ENABLE() END_MESSAGE_MAP() // CMyButton 消息处理程序 void CMyButton::SetBkColor(COLORREF color) { m_bkColor=color; } void CMyButton::SetTextColor(COLORREF color) { m_textColor=color; } BOOL CMyButton::PreCreateWindow(CREATESTRUCT& cs) { BOOL bRet=CButton::PreCreateWindow(cs); ButtonInit(); return bRet; } void CMyButton::PreSubclassWindow() { CButton::PreSubclassWindow(); ButtonInit(); } void CMyButton::ButtonInit() { m_bTracking=false; m_bOver=m_bDown=m_bDisable=false; m_bDisable=IsWindowEnabled()?FALSE:TRUE; ModifyStyle(NULL,BS_OWNERDRAW); } void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) { DrawButton(lpDrawItemStruct->hDC); } void CMyButton::OnMouseMove(UINT nFlags, CPoint point) { if (!m_bTracking) { m_bOver = TRUE; TRACKMOUSEEVENT tme; tme.cbSize = sizeof(tme); tme.hwndTrack = m_hWnd; tme.dwFlags = TME_LEAVE | TME_HOVER; tme.dwHoverTime = 50; m_bTracking = (bool)_TrackMouseEvent(&tme); } CButton::OnMouseMove(nFlags, point); } void CMyButton::OnLButtonDown(UINT nFlags, CPoint point) { m_bDown=TRUE; CButton::OnLButtonDown(nFlags, point); } void CMyButton::OnLButtonUp(UINT nFlags, CPoint point) { m_bDown=FALSE; CButton::OnLButtonUp(nFlags, point); } LRESULT CMyButton::OnMouseLeave(WPARAM wParam, LPARAM lParam) { m_bOver = FALSE; m_bTracking = FALSE; m_bDown=FALSE; InvalidateRect(NULL, FALSE); return 0; } LRESULT CMyButton::OnMouseHover(WPARAM wParam, LPARAM lParam) { m_bOver = TRUE; InvalidateRect(NULL); return 0; } void CMyButton::DrawButton() { HDC hDC=::GetDC(m_hWnd); DrawButton(hDC); ::ReleaseDC(m_hWnd,hDC); } void CMyButton::DrawButton(HDC hDestDC) { CRect rc; GetClientRect(rc); int nWindth=rc.Width(); int nHeight=rc.Height(); HDC hDC=CreateCompatibleDC(hDestDC);//创建兼容DC,采用双缓冲画出 HDC hMaskDC=CreateCompatibleDC(hDestDC); HBITMAP hBitmap=CreateCompatibleBitmap(hDestDC,nWindth,nHeight); HBITMAP hMaskBitmap=CreateCompatibleBitmap(hDestDC,nWindth,nHeight); HBITMAP hOldBitmap=(HBITMAP)SelectObject(hDC,hBitmap); HBITMAP hOldMaskBitmap=(HBITMAP)SelectObject(hMaskDC,hMaskBitmap); SetBkMode(hDC,TRANSPARENT); //把父窗口的背景图复制到按钮的DC上,实现视觉透明---------------- CMainDlg* pParent=(CMainDlg*)GetParent(); CPoint pt(0,0); MapWindowPoints(pParent,&pt,1); pParent->m_bkImage.BitBlt(hDC,rc,pt,SRCCOPY); //------------------------------------------------------------- int nAlpha=100;//0--255 int nOffset=0; HBRUSH hbr=CreateSolidBrush(m_bkColor); FillRect(hMaskDC,&rc,hbr); DeleteObject(hbr); if(m_bDisable){ nAlpha=100; }else if(m_bDown){ nAlpha=180; nOffset=1; }else if(m_bOver){ nAlpha=150; }else{ nAlpha=100; } BLENDFUNCTION blend; memset( &blend, 0, sizeof( blend) ); blend.BlendOp= AC_SRC_OVER; blend.SourceConstantAlpha= nAlpha; // 透明度 最大255 HRGN hRgn=CreateRoundRectRgn(0,0,nWindth,nHeight,3,3); SelectClipRgn (hDC,hRgn); AlphaBlend (hDC,0,0,nWindth,nHeight,hMaskDC, 0,0,nWindth,nHeight,blend); CString strText; GetWindowText(strText); if(strText!=_T("")){ rc.InflateRect(-2,-2); rc.OffsetRect(nOffset,nOffset); HFONT hFont=(HFONT)SendMessage(WM_GETFONT); if(!hFont)hFont=(HFONT)GetStockObject(DEFAULT_GUI_FONT); HFONT hOldFont=(HFONT)SelectObject(hDC,hFont); ::SetTextColor(hDC,m_textColor); ::DrawText(hDC,strText,-1,&rc,DT_SINGLELINE|DT_CENTER|DT_VCENTER|DT_WORD_ELLIPSIS); ::SelectObject(hDC,hOldFont); } SelectClipRgn (hDC,NULL); DeleteObject(hRgn); //复制到控件的DC上------------------------ BitBlt(hDestDC,0,0,nWindth,nHeight,hDC,0,0,SRCCOPY); //删除资源,释放内存----------------------- SelectObject(hDC,hOldBitmap); DeleteObject(hBitmap); DeleteDC(hDC); SelectObject(hMaskDC,hOldMaskBitmap); DeleteObject(hMaskBitmap); DeleteDC(hMaskDC); } void CMyButton::OnEnable(BOOL bEnable) { CButton::OnEnable(bEnable); m_bDisable=IsWindowEnabled()?FALSE:TRUE; DrawButton(); }源码下载:http://download.csdn.net/detail/cometnet/4955726 相关文章:自绘按钮实现颜色选择器 |
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