运行效果
实现方法
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// CMyButtonclass 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"// CMyButtonIMPLEMENT_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;//0–255int 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255HRGN 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();}
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