MFC 实现PNG透明按钮

// // GdipButton.cpp : Version 1.0 - see article at CodeProject.com // // Author: Darren Sessions // // // Description: // GdipButton is a CButton derived control that uses GDI+ // to support alternate image formats // // History // Version 1.0 - 2008 June 10 // - Initial public release // // License: // This software is released under the Code Project Open License (CPOL), // which may be found here: http://www.codeproject.com/info/eula.aspx // You are free to use this software in any way you like, except that you // may not sell this source code. // // This software is provided "as is" with no expressed or implied warranty. // I accept no liability for any damage or loss of business that this // software may cause. // /////////////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "GdipButton.h" #include "CGdiPlusBitmap.h" #include "MemDC.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CGdipButton CGdipButton::CGdipButton() { m_pStdImage = NULL; m_pAltImage = NULL; m_bHaveBitmaps = FALSE; m_bHaveAltImage = FALSE; m_pCurBtn = NULL; m_bIsDisabled = FALSE; m_bIsToggle = FALSE; m_bIsHovering = FALSE; m_bIsTracking = FALSE; m_nCurType = STD_TYPE; m_pToolTip = NULL; } CGdipButton::~CGdipButton() { if(m_pStdImage) delete m_pStdImage; if(m_pAltImage) delete m_pAltImage; if(m_pToolTip) delete m_pToolTip; } BEGIN_MESSAGE_MAP(CGdipButton, CButton) //{{AFX_MSG_MAP(CGdipButton) ON_WM_DRAWITEM() ON_WM_ERASEBKGND() ON_WM_CTLCOLOR_REFLECT() ON_WM_MOUSEMOVE() ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave) ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover) //}}AFX_MSG_MAP END_MESSAGE_MAP() //============================================================================= // // LoadStdImage() // // Purpose: The LoadStdImage() Loads the image for the button. This // function must be called at a minimum or the button wont do // anything. // // Parameters: // [IN] id // resource id, one of the resources already imported with the // resource editor, usually begins with IDR_ // // [IN] pType // pointer to string describing the resource type // // Returns: BOOL // Non zero if successful, otherwise zero // //============================================================================= BOOL CGdipButton::LoadStdImage(UINT id, LPCTSTR pType) { m_pStdImage = new CGdiPlusBitmapResource; return m_pStdImage->Load(id, pType); } //============================================================================= // // LoadAltImage() // // Purpose: The LoadAltImage() Loads the altername image for the button. // This function call is optional // Parameters: // [IN] id // resource id, one of the resources already imported with the // resource editor, usually begins with IDR_ // // [IN] pType // pointer to string describing the resource type // // Returns: BOOL // Non zero if successful, otherwise zero // //============================================================================= BOOL CGdipButton::LoadAltImage(UINT id, LPCTSTR pType) { m_bHaveAltImage = TRUE; m_pAltImage = new CGdiPlusBitmapResource; return (m_pAltImage->Load(id, pType)); } //============================================================================= // // The framework calls this member function when a child control is about to // be drawn. All the bitmaps are created here on the first call. Every thing // is done with a memory DC except the background, which get's it's information // from the parent. The background is needed for transparent portions of PNG // images. An always on top app (such as Task Manager) that is in the way can // cause it to get an incorrect background. To avoid this, the parent should // call the SetBkGnd function with a memory DC when it creates the background. // //============================================================================= HBRUSH CGdipButton::CtlColor(CDC* pScreenDC, UINT nCtlColor) { if(!m_bHaveBitmaps) { if(!m_pStdImage) { return NULL; // Load the standard image with LoadStdImage() } CBitmap bmp, *pOldBitmap; CRect rect; GetClientRect(rect); // do everything with mem dc CMemDC pDC(pScreenDC, rect); Gdiplus::Graphics graphics(pDC->m_hDC); // background if (m_dcBk.m_hDC == NULL) { CRect rect1; CClientDC clDC(GetParent()); GetWindowRect(rect1); GetParent()->ScreenToClient(rect1); m_dcBk.CreateCompatibleDC(&clDC); bmp.CreateCompatibleBitmap(&clDC, rect.Width(), rect.Height()); pOldBitmap = m_dcBk.SelectObject(&bmp); m_dcBk.BitBlt(0, 0, rect.Width(), rect.Height(), &clDC, rect1.left, rect1.top, SRCCOPY); bmp.DeleteObject(); } // standard image if (m_dcStd.m_hDC == NULL) { PaintBk(pDC); graphics.DrawImage(*m_pStdImage, 0, 0); m_dcStd.CreateCompatibleDC(pDC); bmp.CreateCompatibleBitmap(pDC, rect.Width(), rect.Height()); pOldBitmap = m_dcStd.SelectObject(&bmp); m_dcStd.BitBlt(0, 0, rect.Width(), rect.Height(), pDC, 0, 0, SRCCOPY); bmp.DeleteObject(); // standard image pressed if (m_dcStdP.m_hDC == NULL) { PaintBk(pDC); graphics.DrawImage(*m_pStdImage, 1, 1); m_dcStdP.CreateCompatibleDC(pDC); bmp.CreateCompatibleBitmap(pDC, rect.Width(), rect.Height()); pOldBitmap = m_dcStdP.SelectObject(&bmp); m_dcStdP.BitBlt(0, 0, rect.Width(), rect.Height(), pDC, 0, 0, SRCCOPY); bmp.DeleteObject(); } // standard image hot if(m_dcStdH.m_hDC == NULL) { PaintBk(pDC); ColorMatrix HotMat = { 1.05f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 1.05f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 1.05f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 1.00f, 0.00f, 0.05f, 0.05f, 0.05f, 0.00f, 1.00f }; ImageAttributes ia; ia.SetColorMatrix(&HotMat); float width = (float)m_pStdImage->m_pBitmap->GetWidth(); float height = (float)m_pStdImage->m_pBitmap->GetHeight(); RectF grect; grect.X=0, grect.Y=0; grect.Width = width; grect.Height = height; graphics.DrawImage(*m_pStdImage, grect, 0, 0, width, height, UnitPixel, &ia); m_dcStdH.CreateCompatibleDC(pDC); bmp.CreateCompatibleBitmap(pDC, rect.Width(), rect.Height()); pOldBitmap = m_dcStdH.SelectObject(&bmp); m_dcStdH.BitBlt(0, 0, rect.Width(), rect.Height(), pDC, 0, 0, SRCCOPY); bmp.DeleteObject(); } // grayscale image if(m_dcGS.m_hDC == NULL) { PaintBk(pDC); ColorMatrix GrayMat = { 0.30f, 0.30f, 0.30f, 0.00f, 0.00f, 0.59f, 0.59f, 0.59f, 0.00f, 0.00f, 0.11f, 0.11f, 0.11f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 1.00f, 0.00f, 0.00f, 0.00f, 0.00f, 0.00f, 1.00f }; ImageAttributes ia; ia.SetColorMatrix(&GrayMat); float width = (float)m_pStdImage->m_pBitmap->GetWidth(); float height = (float)m_pStdImage->m_pBitmap->GetHeight(); RectF grect; grect.X=0, grect.Y=0; grect.Width = width; grect.Height = height; graphics.DrawImage(*m_pStdImage, grect, 0, 0, width, height, UnitPixel, &ia); m_dcGS.CreateCompatibleDC(pDC); bmp.CreateCompatibleBitmap(pDC, rect.Width(), rect.Height()); pOldBitmap = m_dcGS.SelectObject(&bmp); m_dcGS.BitBlt(0, 0, rect.Width(), rect.Height(), pDC, 0, 0, SRCCOPY); bmp.DeleteObject(); } } // alternate image if( (m_dcAlt.m_hDC == NULL) && m_bHaveAltImage ) { PaintBk(pDC); graphics.DrawImage(*m_pAltImage, 0, 0); m_dcAlt.CreateCompatibleDC(pDC); bmp.CreateCompatibleBitmap(pDC, rect.Width(), re