MFC + CxImage 实现自绘半透明按钮

环境:VS2008 + CxImage

btn.h

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1. #pragma once
2. // CBtn
3. #include "ximage/ximage.h"
4. class CBtn : public CButton
5. {
6. DECLARE_DYNAMIC(CBtn)
7. private:
8. CxImage * m_pImgNormal;
9. CxImage * m_pImgOver;
10. CxImage * m_pImgDown;
11. CxImage * m_pImgFocus;
12. CxImage * m_pImgDisable;
13. BOOL m_bTracking;
14. BOOL m_bMouseOver;
15. BOOL m_bLBtnDown;
16. public:
17. CBtn(UINT imgID_LbtnDown,UINT imgID_Over,UINT imgID_Normal,UINT imgID_Disabled=0,UINT imgID_Focus=0);
18. virtual ~CBtn();
19. protected:
20. DECLARE_MESSAGE_MAP()
21. public:
22. virtual void DrawItem(LPDRAWITEMSTRUCT /*lpDrawItemStruct*/);
23. afx_msg void OnDestroy();
24. afx_msg BOOL OnEraseBkgnd(CDC* pDC);
25. afx_msg void OnMouseMove(UINT nFlags, CPoint point);
26. afx_msg void OnMouseLeave();
27. afx_msg void OnMouseHover(UINT nFlags, CPoint point);
28. protected:
29. virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
30. public:
31. void PaintParent();
32. virtual BOOL Create(LPCTSTR lpszCaption, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID);
33. afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
34. afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
35. afx_msg void OnBnDoubleclicked();
36. afx_msg void OnKillFocus(CWnd* pNewWnd);
37. };

btn.cpp

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1. // Btn.cpp : 实现文件
2. //
3. #include "stdafx.h"
4. #include "Btn.h"
5. // CBtn
6. IMPLEMENT_DYNAMIC(CBtn, CButton)
7. CBtn::CBtn(UINT imgID_LbtnDown,UINT imgID_Over,UINT imgID_Normal,UINT imgID_Disabled,UINT imgID_Focus):
8. m_pImgNormal(NULL)
9. , m_pImgOver(NULL)
10. , m_pImgDown(NULL)
11. , m_pImgFocus(NULL)
12. , m_pImgDisable(NULL)
13. , m_bTracking(FALSE)
14. , m_bMouseOver(FALSE)
15. , m_bLBtnDown(FALSE)
16. {
17. if(imgID_Normal > 0)
18. {
19. if(!m_pImgNormal)
20. m_pImgNormal = new CxImage(CXIMAGE_FORMAT_PNG);
21. m_pImgNormal ->LoadResource(FindResource(NULL,MAKEINTRESOURCE(imgID_Normal),L"PNG"),CXIMAGE_FORMAT_PNG);
22. }
23. if(imgID_Focus > 0)
24. {
25. if(!m_pImgFocus)
26. m_pImgFocus = new CxImage(CXIMAGE_FORMAT_PNG);
27. m_pImgFocus ->LoadResource(FindResource(NULL,MAKEINTRESOURCE(imgID_Focus),L"PNG"),CXIMAGE_FORMAT_PNG);
28. }
29. if( imgID_LbtnDown>0 )
30. {
31. if(!m_pImgDown)
32. m_pImgDown = new CxImage(CXIMAGE_FORMAT_PNG);
33. m_pImgDown ->LoadResource(FindResource(NULL,MAKEINTRESOURCE(imgID_LbtnDown),L"PNG"),CXIMAGE_FORMAT_PNG);
34. }
35. if( imgID_Disabled > 0 )
36. {
37. if(!m_pImgDisable)
38. m_pImgDisable = new CxImage(CXIMAGE_FORMAT_PNG);
39. m_pImgDisable ->LoadResource(FindResource(NULL,MAKEINTRESOURCE(imgID_Disabled),L"PNG"),CXIMAGE_FORMAT_PNG);
40. }
41. if( imgID_Over > 0)
42. {
43. if(!m_pImgOver)
44. m_pImgOver = new CxImage(CXIMAGE_FORMAT_PNG);
45. m_pImgOver ->LoadResource(FindResource(NULL,MAKEINTRESOURCE(imgID_Over),L"PNG"),CXIMAGE_FORMAT_PNG);
46. }
47. }
48. CBtn::~CBtn()
49. {
50. }
51. BEGIN_MESSAGE_MAP(CBtn, CWnd)
52. ON_WM_DESTROY()
53. ON_WM_ERASEBKGND()
54. ON_WM_MOUSEMOVE()
55. ON_WM_MOUSELEAVE()
56. ON_WM_MOUSEHOVER()
57. ON_WM_LBUTTONDOWN()
58. ON_WM_LBUTTONUP()
59. ON_CONTROL_REFLECT(BN_DOUBLECLICKED, &CBtn::OnBnDoubleclicked)
60. ON_WM_KILLFOCUS()
61. END_MESSAGE_MAP()
62. // CBtn 消息处理程序
63. void CBtn::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
64. {
65. CDC ButtonDC;
66. CRect rc;
67. ButtonDC.Attach(lpDrawItemStruct->hDC); //得到用于绘制按钮的DC
68. rc=lpDrawItemStruct->rcItem; //获取按钮所占的矩形大小
69. UINT state = lpDrawItemStruct->itemState; //获取按钮目前所处的状态，根据不同的状态绘制不同的按钮
70. if(state&ODS_DISABLED && m_pImgDisable)
71. {
72. m_pImgDisable ->Draw(ButtonDC.GetSafeHdc(),rc);
73. }
74. else
75. {
76. if( m_bLBtnDown && m_pImgDown)
77. {
78. m_pImgDown ->Draw(ButtonDC.GetSafeHdc(),rc);
79. }
80. else if(m_bMouseOver && m_pImgOver)
81. {
82. m_pImgOver ->Draw(ButtonDC.GetSafeHdc(),rc);
83. }
84. else if(state&ODS_FOCUS && m_pImgFocus)
85. {
86. m_pImgFocus ->Draw(ButtonDC.GetSafeHdc(),rc);
87. }
88. else if(m_pImgNormal)
89. {
90. m_pImgNormal ->Draw(ButtonDC.GetSafeHdc(),rc);
91. }
92. }
93. }
94. void CBtn::OnDestroy()
95. {
96. CButton::OnDestroy();
97. // TODO: 在此处添加消息处理程序代码
98. if(m_pImgNormal)
99. {
100. m_pImgNormal ->Destroy();
101. delete m_pImgNormal;
102. m_pImgNormal = NULL;
103. }
104. if(m_pImgOver)
105. {
106. m_pImgOver ->Destroy();
107. delete m_pImgOver;
108. m_pImgOver = NULL;
109. }
110. if(m_pImgDown)
111. {
112. m_pImgDown ->Destroy();
113. delete m_pImgDown;
114. m_pImgDown = NULL;
115. }
116. if(m_pImgFocus)
117. {
118. m_pImgFocus ->Destroy();
119. delete m_pImgFocus;
120. m_pImgFocus = NULL;
121. }
122. if(m_pImgDisable)
123. {
124. m_pImgDisable ->Destroy();
125. delete m_pImgDisable;
126. m_pImgDisable = NULL;
127. }
128. }
129. BOOL CBtn::OnEraseBkgnd(CDC* pDC)
130. {
131. // TODO: 在此添加消息处理程序代码和/或调用默认值
132. return TRUE;
133. //return CButton::OnEraseBkgnd(pDC);
134. }
135. BOOL CBtn::PreCreateWindow(CREATESTRUCT& cs)
136. {
137. // TODO: 在此添加专用代码和/或调用基类
138. cs.style |= BS_OWNERDRAW;
139. return CButton::PreCreateWindow(cs);
140. }
141. void CBtn::OnMouseMove(UINT nFlags, CPoint point)
142. {
143. // TODO: 在此添加消息处理程序代码和/或调用默认值
144. m_bMouseOver = TRUE;
145. if (!m_bTracking)
146. {
147. TRACKMOUSEEVENT   tme;
148. tme.cbSize      =   sizeof(TRACKMOUSEEVENT);
149. tme.dwFlags     =   TME_LEAVE|TME_HOVER; //
150. tme.hwndTrack   =   GetSafeHwnd();
151. tme.dwHoverTime =   8;
152. _TrackMouseEvent(&tme);
153. m_bTracking = TRUE;
154. }
155. CButton::OnMouseMove(nFlags, point);
156. ::SetCursor(AfxGetApp() ->LoadCursor(IDC_CURSOR_HAND));
157. }
158. void CBtn::OnMouseLeave()
159. {
160. // TODO: 在此添加消息处理程序代码和/或调用默认值
161. m_bMouseOver    =   FALSE;
162. m_bTracking     =   FALSE;
163. m_bLBtnDown     =   FALSE;
164. PaintParent();
165. CButton::OnMouseLeave();
166. }
167. void CBtn::OnMouseHover(UINT nFlags, CPoint point)
168. {
169. m_bMouseOver = TRUE;
170. PaintParent();
171. ::SetCursor(AfxGetApp() ->LoadCursor(IDC_CURSOR_HAND));
172. }
173. void CBtn::PaintParent()
174. {
175. CRect   rect;
176. GetWindowRect(&rect);
177. GetParent()-> ScreenToClient(&rect);
178. GetParent()-> InvalidateRect(&rect);
179. }
180. BOOL CBtn::Create(LPCTSTR lpszCaption, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID)
181. {
182. BOOL OK=CButton::Create(lpszCaption, dwStyle, rect, pParentWnd, nID);
183. ModifyStyleEx(0, WS_EX_TRANSPARENT);// WS_EX_LAYERED||WS_EX_TRANSPARENT
184. return OK;
185. }
186. void CBtn::OnLButtonDown(UINT nFlags, CPoint point)
187. {
188. m_bLBtnDown = TRUE;
189. PaintParent();
190. CButton::OnLButtonDown(nFlags, point);
191. ::SetCursor(AfxGetApp() ->LoadCursor(IDC_CURSOR_HAND));
192. }
193. void CBtn::OnLButtonUp(UINT nFlags, CPoint point)
194. {
195. m_bLBtnDown = FALSE;
196. PaintParent();
197. CButton::OnLButtonUp(nFlags, point);
198. ::SetCursor(AfxGetApp() ->LoadCursor(IDC_CURSOR_HAND));
199. }
200. void CBtn::OnBnDoubleclicked()
201. {
202. // TODO: 在此添加控件通知处理程序代码
203. ::SetCursor(AfxGetApp() ->LoadCursor(IDC_CURSOR_HAND));
204. }
205. void CBtn::OnKillFocus(CWnd* pNewWnd)
206. {
207. CButton::OnKillFocus(pNewWnd);
208. // TODO: 在此处添加消息处理程序代码
209. PaintParent();
210. }

调用

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1. ///头文件中添加
2. ...
3. #include "Btn.h"
4. ...
5. enum {emTestBtnId1=8099,emTestBtnId2,emTestBtnId3};
6. CBtn m_btnTest1,m_btnTest2,m_btnTest3;//test
7. ///在构造函数初始化列表中初始化变量(IDB_PNG_BTN_TEST_*为Png图片资源ID)
8. , m_btnTest1(IDB_PNG_BTN_TEST_DOWN,
9. IDB_PNG_BTN_TEST_MOUSEOVER,
10. IDB_PNG_BTN_TEST_NORMAL,
11. IDB_PNG_BTN_TEST_DISABLE,
12. IDB_PNG_BTN_TEST_FOCUS)
13. , m_btnTest2(IDB_PNG_BTN_TEST_DOWN,
14. IDB_PNG_BTN_TEST_MOUSEOVER,
15. IDB_PNG_BTN_TEST_NORMAL,
16. IDB_PNG_BTN_TEST_DISABLE/*,IDB_PNG_BTN_TEST_FOCUS*/)
17. , m_btnTest3(IDB_PNG_BTN_TEST_DOWN,
18. IDB_PNG_BTN_TEST_MOUSEOVER,
19. IDB_PNG_BTN_TEST_NORMAL,
20. IDB_PNG_BTN_TEST_DISABLE/*,IDB_PNG_BTN_TEST_FOCUS*/)
21. ////在OnInitDialog()函数中创建按钮
22. //test
23. m_btnTest1.Create(_T("test"),WS_VISIBLE | WS_CHILD/* |WS_DISABLED*/,CRect(10,10,58,58),this,emTestBtnId1);
24. m_btnTest2.Create(_T("test"),WS_VISIBLE | WS_CHILD/* |WS_DISABLED*/,CRect(10,60,58,108),this,emTestBtnId2);
25. m_btnTest3.Create(_T("test"),WS_VISIBLE | WS_CHILD |WS_DISABLED,CRect(10,110,58,158),this,emTestBtnId2);

效果图