自绘滑块控件(Slider Control)

#include "StdAfx.h" #include "CustomSlider.h" #include "memdc.h" //双缓冲 CCustomSlider::CCustomSlider(void) { m_nPos = 0; m_nMin = 0; m_nMax = 100; m_nPage = 20; m_bkgColor = GetSysColor(COLOR_BTNFACE); m_bChannelWithBm = m_bChannelActiveWithBm = FALSE; m_bThumbWithBm = m_bThumbActiveWithBm = FALSE; m_nChannelWidth = m_nChannelHeight = 0; m_nThumbWidth = m_nThumbHeight = 0; m_bLButtonDown = FALSE; m_hCursor = NULL; m_nMargin = 0; m_bEnable = TRUE; } CCustomSlider::~CCustomSlider(void) { } BEGIN_MESSAGE_MAP(CCustomSlider, CWnd) ON_WM_ERASEBKGND() ON_WM_PAINT() ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() ON_WM_MOUSEMOVE() ON_WM_SETCURSOR() ON_WM_KEYDOWN() END_MESSAGE_MAP() BOOL CCustomSlider::OnEraseBkgnd(CDC* pDC) { return TRUE; } void CCustomSlider::OnPaint() { CPaintDC dc(this); //dc.SetBkMode(TRANSPARENT); //控件背景透明 CRect rcClient; GetClientRect(&rcClient); CMemDC dcMem(&dc, &rcClient); //双缓冲实现类 dcMem.FillSolidRect(rcClient, m_bkgColor); //画背景色 CDC dcTmp; dcTmp.CreateCompatibleDC(&dcMem); dcMem.SetStretchBltMode(COLORONCOLOR); CBitmap *pBmpOld = NULL; if (m_bChannelWithBm) { //画带图片的背景通道 pBmpOld = dcTmp.SelectObject(&m_bmChannel); int xStart = rcClient.left + m_nMargin; int yStart = rcClient.top + (rcClient.Height() - m_nChannelHeight) / 2; int nWidth = rcClient.Width() - (m_nMargin * 2); dcMem.StretchBlt(xStart, yStart, nWidth, m_nChannelHeight, &dcTmp, 0, 0, m_nChannelWidth, m_nChannelHeight, SRCCOPY); //横向拉伸 dcTmp.SelectObject(pBmpOld); if (m_bChannelActiveWithBm) { //画带图片的激活通道 dcTmp.SelectObject(&m_bmChannelActive); xStart = rcClient.left + m_nMargin; yStart = rcClient.top + (rcClient.Height() - m_nChannelHeight) / 2; nWidth = (int)((rcClient.Width()-(m_nMargin * 2)) * ((double)(m_nPos - m_nMin) / (m_nMax - m_nMin))); dcMem.StretchBlt(xStart, yStart, nWidth, m_nChannelHeight, &dcTmp, 0, 0, m_nChannelWidth, m_nChannelHeight, SRCCOPY); } dcTmp.SelectObject(pBmpOld); } else { //如果没有图片,画个简单的通道 dcMem.Draw3dRect(rcClient, GetSysColor(COLOR_3DSHADOW), GetSysColor(COLOR_3DSHADOW)); //边框 CRect rcChannel = rcClient; rcChannel.left++; rcChannel.right--; rcChannel.top++; rcChannel.bottom--; dcMem.FillSolidRect(rcChannel, GetSysColor(COLOR_BTNFACE)); //背景部分 rcChannel.right = (LONG)(rcChannel.left + (rcChannel.Width() * ((double)(m_nPos - m_nMin) / (m_nMax - m_nMin)))); dcMem.FillSolidRect(rcChannel, GetSysColor(COLOR_ACTIVECAPTION)); //激活部分 } // 画thumb按钮 if(m_bThumbWithBm) { if(m_bThumbActiveWithBm && m_bLButtonDown ) pBmpOld = dcTmp.SelectObject(&m_bmThumbActive); else pBmpOld = dcTmp.SelectObject(&m_bmThumb); int xStart = (int)(rcClient.left + (rcClient.Width()-m_nThumbWidth) * ((double)(m_nPos - m_nMin) / (m_nMax - m_nMin))); //定位按钮位置 int yStart = rcClient.top + (rcClient.Height() - m_nThumbHeight) / 2; dcMem.BitBlt(xStart, yStart, m_nThumbWidth, m_nThumbHeight, &dcTmp, 0, 0, SRCCOPY); dcTmp.SelectObject(pBmpOld); } dcTmp.DeleteDC(); } void CCustomSlider::OnLButtonDown(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default if(!m_bEnable) return; m_bLButtonDown = TRUE; SetCapture(); SetFocus(); OnMouseMove(nFlags, point); Invalidate(); CWnd::OnLButtonDown(nFlags, point); } void CCustomSlider::OnLButtonUp(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default if(!m_bEnable) return; ReleaseCapture(); m_bLButtonDown = FALSE; Invalidate(); CWnd::OnLButtonUp(nFlags, point); } void CCustomSlider::OnMouseMove(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default if(!m_bLButtonDown || !m_bEnable) return; CRect rcClient; GetClientRect(&rcClient); int nPosNow = (int)(m_nMin + ((double)(point.x-m_nMargin) / (rcClient.Width()-m_nMargin*2)) * (m_nMax - m_nMin) + 0.5); //round if (nPosNow != m_nPos) SetPos(nPosNow); CWnd::OnMouseMove(nFlags, point); } void CCustomSlider::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) { // TODO: Add your message handler code here and/or call default if(!m_bEnable) return; switch(nChar) { // Left & up case VK_LEFT : case VK_UP : SetPos(m_nPos-1); break; // Right & down case VK_RIGHT : case VK_DOWN : SetPos(m_nPos+1); break; // Home case VK_HOME : SetPos(m_nMin); break; // End case VK_END : SetPos(m_nMax); break; // Page up case VK_PRIOR : SetPos(m_nPos - m_nPage); break; // Page down case VK_NEXT : SetPos(m_nPos + m_nPage); break; default : break; } CWnd::OnKeyDown(nChar, nRepCnt, nFlags); } BOOL CCustomSlider::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) { // TODO: Add your message handler code here and/or call default if(m_hCursor != NULL) { ::SetCursor(m_hCursor); return TRUE; } return FALSE; } void CCustomSlider::SetBkgColor(COLORREF clr) { m_bkgColor = clr; } BOOL CCustomSlider::SetBitmapChannel(UINT nChannelID, UINT nActiveID) { if (!nChannelID) { m_bChannelWithBm = FALSE; m_bmChannel.DeleteObject(); m_bmChannelActive.DeleteObject(); return TRUE; } m_bmChannel.DeleteObject(); if(!m_bmChannel.LoadBitmap(nChannelID)) return FALSE; m_bChannelWithBm = TRUE; if(nActiveID) { m_bmChannelActive.DeleteObject(); if(!m_bmChannelActive.LoadBitmap(nActiveID)) { m_bmChannel.DeleteObject(); return FALSE; } m_bChannelActiveWithBm = TRUE; } else m_bChannelActiveWithBm = FALSE; // Get size of bitmap. BITMAP bitmap; m_bmChannel.GetBitmap(&bitmap); m_nChannelWidth = bitmap.bmWidth; m_nChannelHeight = bitmap.bmHeight; return TRUE; } BOOL CCustomSlider::SetBitmapThumb(UINT nThumbID, UINT nActiveID) { if(!nThumbID) { m_bThumbWithBm = FALSE; m_bmThumb.DeleteObject(); m_bmThumbActive.DeleteObject(); return TRUE; } m_bmThumb.DeleteObject(); if(!m_bmThumb.LoadBitmap(nThumbID)) return FALSE; m_bThumbWithBm = TRUE; if(nActiveID) { m_bmThumbActive.DeleteObject(); if( !m_bmThumbActive.LoadBitmap( nActiveID ) ) { m_bmThumb.DeleteObject(); return FALSE; } m_bThumbActiveWithBm = TRUE; } else m_bThumbActiveWithBm = FALSE; //Get size of the bitmap BITMAP bitmap; m_bmThumb.GetBitmap( &bitmap ); m_nThumbWidth = bitmap.bmWidth; m_nThumbHeight = bitmap.bmHeight; CRect rcClient; GetClientRect(&rcClient); ASSERT(m_nThumbHeight <= rcClient.Height() && m_nThumbWidth <= rcClient.Width()); return TRUE; } void CCustomSlider::SetPos(int nPos) { m_nPos = nPos; // Boundary check if(m_nPos > m_nMax) m_nPos = m_nMax; if(m_nPos < m_nMin) m_nPos = m_nMin; Invalidate(); } void CCustomSlider::SetRange(int nMin, int nMax, BOOL bRedraw) { SetRangeMin(nMin, FALSE); SetRangeMax(nMax, bRedraw); } void CCustomSlider::SetRangeMin(int nMin, BOOL bRedraw) { m_nMin = nMin; if(bRedraw) Invalidate(); } void CCustomSlider::SetRangeMax(int nMax, BOOL bRedraw) { m_nMax = nMax; if(bRedraw) Invalidate(); } void CCustomSlider::Enable(BOOL bEnable) { m_bEnable = bEnable; // If control is disabled during dragging if(!m_bEnable && m_bLButtonDown) { m_bLButtonDown = FALSE; ReleaseCapture(); } Invalidate(); }