自绘实现半透明水晶按钮 .
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
- // 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();
- }