自绘实现半透明水晶按钮（继承CButton，设置BS_OWNERDRAW风格，覆盖DrawItem函数绘制按钮，把父窗口的背景复制到按钮上，实现视觉上的透明，最后通过AlphaBlend实现半透明）

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

1. // MyButton.h
2. #pragma once
3. // CMyButton
4. class CMyButton : public CButton
5. {
6. DECLARE_DYNAMIC(CMyButton)
7. public:
8. CMyButton();
9. virtual ~CMyButton();
10. public:
11. void SetBkColor(COLORREF color);
12. void SetTextColor(COLORREF color);
13. private:
14. bool m_bOver;
15. bool m_bDown;
16. bool m_bDisable;
17. bool m_bTracking;
18. COLORREF m_bkColor;
19. COLORREF m_textColor;
20. protected:
21. DECLARE_MESSAGE_MAP()
22. virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
23. virtual void PreSubclassWindow();
24. public:
25. virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/);
26. afx_msg void OnMouseMove(UINT nFlags, CPoint point);
27. afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
28. afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
29. afx_msg LRESULT OnMouseLeave(WPARAM wParam, LPARAM lParam);
30. afx_msg LRESULT OnMouseHover(WPARAM wParam, LPARAM lParam);
31. afx_msg void OnEnable(BOOL bEnable);
32. private:
33. void ButtonInit();
34. void DrawButton();
35. void DrawButton(HDC hDestDC);
36. };

1. // MyButton.cpp : 实现文件
2. //
3. #include "stdafx.h"
4. #include "AlphaButton.h"
5. #include "MyButton.h"
6. #include "MainDlg.h"
7. // CMyButton
8. IMPLEMENT_DYNAMIC(CMyButton, CButton)
9. CMyButton::CMyButton()
10. {
11. m_bkColor=0xFFFFFF;
12. m_textColor=0x000000;
13. }
14. CMyButton::~CMyButton()
15. {
16. }
17. BEGIN_MESSAGE_MAP(CMyButton, CButton)
18. ON_WM_MOUSEMOVE()
19. ON_WM_LBUTTONDOWN()
20. ON_WM_LBUTTONUP()
21. ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
22. ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover)
23. ON_WM_ENABLE()
24. END_MESSAGE_MAP()
25. // CMyButton 消息处理程序
26. void CMyButton::SetBkColor(COLORREF color)
27. {
28. m_bkColor=color;
29. }
30. void CMyButton::SetTextColor(COLORREF color)
31. {
32. m_textColor=color;
33. }
34. BOOL CMyButton::PreCreateWindow(CREATESTRUCT& cs)
35. {
36. BOOL bRet=CButton::PreCreateWindow(cs);
37. ButtonInit();
38. return bRet;
39. }
40. void CMyButton::PreSubclassWindow()
41. {
42. CButton::PreSubclassWindow();
43. ButtonInit();
44. }
45. void CMyButton::ButtonInit()
46. {
47. m_bTracking=false;
48. m_bOver=m_bDown=m_bDisable=false;
49. m_bDisable=IsWindowEnabled()?FALSE:TRUE;
50. ModifyStyle(NULL,BS_OWNERDRAW);
51. }
52. void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
53. {
54. DrawButton(lpDrawItemStruct->hDC);
55. }
56. void CMyButton::OnMouseMove(UINT nFlags, CPoint point)
57. {
58. if (!m_bTracking)
59. {
60. m_bOver = TRUE;
61. TRACKMOUSEEVENT tme;
62. tme.cbSize = sizeof(tme);
63. tme.hwndTrack = m_hWnd;
64. tme.dwFlags = TME_LEAVE | TME_HOVER;
65. tme.dwHoverTime = 50;
66. m_bTracking = (bool)_TrackMouseEvent(&tme);
67. }
68. CButton::OnMouseMove(nFlags, point);
69. }
70. void CMyButton::OnLButtonDown(UINT nFlags, CPoint point)
71. {
72. m_bDown=TRUE;
73. CButton::OnLButtonDown(nFlags, point);
74. }
75. void CMyButton::OnLButtonUp(UINT nFlags, CPoint point)
76. {
77. m_bDown=FALSE;
78. CButton::OnLButtonUp(nFlags, point);
79. }
80. LRESULT CMyButton::OnMouseLeave(WPARAM wParam, LPARAM lParam)
81. {
82. m_bOver = FALSE;
83. m_bTracking = FALSE;
84. m_bDown=FALSE;
85. InvalidateRect(NULL, FALSE);
86. return 0;
87. }
88. LRESULT CMyButton::OnMouseHover(WPARAM wParam, LPARAM lParam)
89. {
90. m_bOver = TRUE;
91. InvalidateRect(NULL);
92. return 0;
93. }
94. void CMyButton::DrawButton()
95. {
96. HDC hDC=::GetDC(m_hWnd);
97. DrawButton(hDC);
98. ::ReleaseDC(m_hWnd,hDC);
99. }
100. void CMyButton::DrawButton(HDC hDestDC)
101. {
102. CRect rc;
103. GetClientRect(rc);
104. int nWindth=rc.Width();
105. int nHeight=rc.Height();
106. HDC hDC=CreateCompatibleDC(hDestDC);//创建兼容DC,采用双缓冲画出
107. HDC hMaskDC=CreateCompatibleDC(hDestDC);
108. HBITMAP hBitmap=CreateCompatibleBitmap(hDestDC,nWindth,nHeight);
109. HBITMAP hMaskBitmap=CreateCompatibleBitmap(hDestDC,nWindth,nHeight);
110. HBITMAP hOldBitmap=(HBITMAP)SelectObject(hDC,hBitmap);
111. HBITMAP hOldMaskBitmap=(HBITMAP)SelectObject(hMaskDC,hMaskBitmap);
112. SetBkMode(hDC,TRANSPARENT);
113. //把父窗口的背景图复制到按钮的DC上,实现视觉透明----------------
114. CMainDlg* pParent=(CMainDlg*)GetParent();
115. CPoint pt(0,0);
116. MapWindowPoints(pParent,&pt,1);
117. pParent->m_bkImage.BitBlt(hDC,rc,pt,SRCCOPY);
118. //-------------------------------------------------------------
119. int nAlpha=100;//0--255
120. int nOffset=0;
121. HBRUSH hbr=CreateSolidBrush(m_bkColor);
122. FillRect(hMaskDC,&rc,hbr);
123. DeleteObject(hbr);
124. if(m_bDisable){
125. nAlpha=100;
126. }else if(m_bDown){
127. nAlpha=180;
128. nOffset=1;
129. }else if(m_bOver){
130. nAlpha=150;
131. }else{
132. nAlpha=100;
133. }
134. BLENDFUNCTION blend;
135. memset( &blend, 0, sizeof( blend) );
136. blend.BlendOp= AC_SRC_OVER;
137. blend.SourceConstantAlpha= nAlpha; // 透明度 最大255
138. HRGN hRgn=CreateRoundRectRgn(0,0,nWindth,nHeight,3,3);
139. SelectClipRgn (hDC,hRgn);
140. AlphaBlend (hDC,0,0,nWindth,nHeight,hMaskDC, 0,0,nWindth,nHeight,blend);
141. CString strText;
142. GetWindowText(strText);
143. if(strText!=_T("")){
144. rc.InflateRect(-2,-2);
145. rc.OffsetRect(nOffset,nOffset);
146. HFONT hFont=(HFONT)SendMessage(WM_GETFONT);
147. if(!hFont)hFont=(HFONT)GetStockObject(DEFAULT_GUI_FONT);
148. HFONT hOldFont=(HFONT)SelectObject(hDC,hFont);
149. ::SetTextColor(hDC,m_textColor);
150. ::DrawText(hDC,strText,-1,&rc,DT_SINGLELINE|DT_CENTER|DT_VCENTER|DT_WORD_ELLIPSIS);
151. ::SelectObject(hDC,hOldFont);
152. }
153. SelectClipRgn (hDC,NULL);
154. DeleteObject(hRgn);
155. //复制到控件的DC上------------------------
156. BitBlt(hDestDC,0,0,nWindth,nHeight,hDC,0,0,SRCCOPY);
157. //删除资源,释放内存-----------------------
158. SelectObject(hDC,hOldBitmap);
159. DeleteObject(hBitmap);
160. DeleteDC(hDC);
161. SelectObject(hMaskDC,hOldMaskBitmap);
162. DeleteObject(hMaskBitmap);
163. DeleteDC(hMaskDC);
164. }
165. void CMyButton::OnEnable(BOOL bEnable)
166. {
167. CButton::OnEnable(bEnable);
168. m_bDisable=IsWindowEnabled()?FALSE:TRUE;
169. DrawButton();
170. }

源码下载:http://download.csdn.net/detail/cometnet/4955726

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