会变颜色的按扭 好样例 作为参考 可利用性强

// HoverButton.cpp : implementation file // #include "stdafx.h" #include "hovbutt.h" #include "HoverButton.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CHoverButton BEGIN_MESSAGE_MAP(CHoverButton, CBitmapButton) //{{AFX_MSG_MAP(CHoverButton) ON_WM_MOUSEMOVE() ON_WM_LBUTTONUP() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CHoverButton construction / destruction CHoverButton::CHoverButton() { // To start with, the button is switched off and we are NOT tracking the mouse m_ButtonState = BUTTON_OFF; m_bMouseTracking = FALSE; } CHoverButton::~CHoverButton() { } ///////////////////////////////////////////////////////////////////////////// // CHoverButton message handlers void CHoverButton::OnMouseMove(UINT nFlags, CPoint point) { CBitmapButton::OnMouseMove(nFlags, point); // 1. Mouse has moved and we are not tracking this button, or // 2. mouse has moved and the cursor was not above this window // == Is equivalent to WM_MOUSEENTER (for which there is no message) if((!m_bMouseTracking || GetCapture()!=this) && (m_ButtonState == BUTTON_OFF)) { OnMouseEnter(); } else { if(m_ButtonState == BUTTON_OVER) { CRect rc; GetClientRect(&rc); if(!rc.PtInRect(point)) // The mouse cursor is no longer above this button OnMouseLeave(); } } } void CHoverButton::OnMouseEnter(void) { // We are now tracking the mouse, OVER this button m_bMouseTracking = TRUE; m_ButtonState = BUTTON_OVER; // Ensure that mouse input is sent to the button SetCapture(); Invalidate(); UpdateWindow(); } void CHoverButton::OnMouseLeave(void) { // We are not tracking the mouse, this button is OFF. m_ButtonState = BUTTON_OFF; m_bMouseTracking = FALSE; // Release mouse capture from the button and restore normal mouse input Invalidate(); UpdateWindow(); ReleaseCapture(); } void CHoverButton::OnLButtonUp(UINT nFlags, CPoint point) { SetButtonState(BUTTON_ON); // Highlight button CBitmapButton::OnLButtonUp(nFlags, point); } // Purpose: Set the new state of the button // Return: Returns the old state of the button // Parameters: nState = Either ON or OFF. The default is OFF. This is NOT tri-state button! BUTTON_STATE CHoverButton::SetButtonState(BUTTON_STATE nState) { BUTTON_STATE nOldState = (BUTTON_STATE)GetCheck(); m_ButtonState = nState; switch(m_ButtonState) { case BUTTON_ON: EnableWindow(TRUE); SetState(BUTTON_ON); break; case BUTTON_GREYED: EnableWindow(FALSE); break; case BUTTON_OVER: EnableWindow(TRUE); SetState(BUTTON_OVER); break; default: EnableWindow(TRUE); SetState(BUTTON_OFF); m_ButtonState = BUTTON_OFF; break; } return(nOldState); } // Draws the buttons in their relevant state, and text labels void CHoverButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) { CDC memDC; CBitmap* pOld=NULL; CBitmap* pBitmap=NULL; CDC* pDC; CRect rc; int iSaveDC; pDC= CDC::FromHandle(lpDrawItemStruct->hDC); memDC.CreateCompatibleDC(pDC); VERIFY(pDC); iSaveDC=pDC->SaveDC(); rc.CopyRect(&lpDrawItemStruct->rcItem); pDC->SetBkMode(TRANSPARENT); pDC->SetTextColor(GetSysColor(COLOR_WINDOWFRAME));// Black text color switch(m_ButtonState) { case BUTTON_ON: pBitmap=&m_bmpButtonDown; break; case BUTTON_OVER: pBitmap=&m_bmpButtonFocussed; break; case BUTTON_GREYED: pBitmap=&m_bmpButtonDisabled; break; default: pBitmap=&m_bmpButtonUp; break; } CString strTitle; GetWindowText(strTitle); if (pBitmap->m_hObject) { CRect rcBitmap(rc); BITMAP bmpInfo; CSize size; // Text size = pDC->GetTextExtent(strTitle); rcBitmap.OffsetRect(size.cx+5,0); // Draw bitmap if(!pBitmap->GetBitmap(&bmpInfo)) return; pOld=memDC.SelectObject((CBitmap*) pBitmap); if (pOld==NULL) return; //Destructors will clean up if(!pDC->BitBlt(0, 0, rc.Width(), rc.Height(), &memDC, 0, 0, SRCCOPY)) return; memDC.SelectObject(pOld); if(memDC==NULL) return; } CRect rcText(rc); UINT nFormat = DT_CENTER; if(m_ButtonState == BUTTON_GREYED) { rcText.OffsetRect(1,1); pDC->SetTextColor(GetSysColor(COLOR_BTNHIGHLIGHT)); pDC->DrawText(strTitle,rcText,nFormat); rcText.OffsetRect(-1,-1); pDC->SetTextColor(GetSysColor(COLOR_BTNSHADOW)); pDC->DrawText(strTitle,rcText,nFormat); } else pDC->DrawText(strTitle,rcText,nFormat); pDC->RestoreDC(iSaveDC); } BOOL CHoverButton::LoadBitmaps(UINT nBitmapUp, UINT nBitmapDown, UINT nBitmapFocus, UINT nBitmapDisabled) { return LoadBitmaps(MAKEINTRESOURCE(nBitmapUp), MAKEINTRESOURCE(nBitmapDown), MAKEINTRESOURCE(nBitmapFocus), MAKEINTRESOURCE(nBitmapDisabled)); } BOOL CHoverButton::LoadBitmaps(LPCSTR lpszBitmapUp, LPCSTR lpszBitmapDown, LPCSTR lpszBitmapFocus, LPCSTR lpszBitmapDisabled) { BOOL bAllLoaded=TRUE; //Delete old ones m_bmpButtonDown.DeleteObject(); m_bmpButtonFocussed.DeleteObject(); m_bmpButtonUp.DeleteObject(); m_bmpButtonDisabled.DeleteObject(); if (!m_bmpButtonUp.LoadBitmap(lpszBitmapUp)) { TRACE0("Failed to load up bitmap of bitmap button\n"); return FALSE; } if (lpszBitmapDown!=NULL) { if (!m_bmpButtonDown.LoadBitmap(lpszBitmapDown)) { TRACE0("Failed to load down bitmap of bitmap button\n"); return bAllLoaded=FALSE; } } if (lpszBitmapFocus!=NULL) { if (!m_bmpButtonFocussed.LoadBitmap(lpszBitmapFocus)) { TRACE0("Failed to load focussed bitmap of bitmap button\n"); return bAllLoaded=FALSE; } } if (lpszBitmapDisabled!=NULL) { if (!m_bitmapDisabled.LoadBitmap(lpszBitmapDisabled)) { TRACE0("Failed to load disabled bitmap of bitmap button\n"); return bAllLoaded=FALSE; } } return bAllLoaded; }