任意贴图的slider控件

// BitmapSlider.cpp : implementation file // #include "stdafx.h" #include "BitmapSlider.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // // CBitmapSlider v1.5 // // It's free for everywhere - 16/September/2003 - Joon-ho Ryu // ///////////////////////////////////////////////////////////////////////////// CBitmapSlider::CBitmapSlider() { m_nPos = m_nMin = 0; m_nMax = 100; m_nPage = 20; m_nMarginLeft = m_nMarginRight = m_nMarginTop = m_nMarginBottom = 0; m_nThumbWidth = m_nThumbHeight = 0; m_bChannel = m_bVertical = m_bThumb = m_bLButtonDown = m_bThumbDisable = FALSE; m_bFocusRect = m_bFocus = FALSE; m_bDrawFocusRect = FALSE; m_bCustomerSetLength = FALSE; m_bEnable = TRUE; m_nThumbBgX = m_nThumbBgY = -1; } CBitmapSlider::~CBitmapSlider() { } BEGIN_MESSAGE_MAP(CBitmapSlider, CStatic) //{{AFX_MSG_MAP(CBitmapSlider) ON_WM_ERASEBKGND() ON_WM_PAINT() ON_WM_LBUTTONDOWN() ON_WM_MOUSEMOVE() ON_WM_LBUTTONUP() ON_WM_GETDLGCODE() ON_WM_KEYDOWN() ON_WM_KILLFOCUS() ON_WM_SETFOCUS() ON_WM_CREATE() ON_WM_DESTROY() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CBitmapSlider message handlers BOOL CBitmapSlider::OnEraseBkgnd(CDC* pDC) { // Do not erase background for the transparency effect return TRUE; } // Draw channel and thumb // void CBitmapSlider::OnPaint() { CPaintDC dcOrigin(this); // "Flicker Free Drawing In MFC" by Keith Rule CMemDC dc( &dcOrigin, &m_rect, m_bTransparentChannel ); CDC dcMem; dcMem.CreateCompatibleDC( &dc ); CBitmap *pbmTmp; // Delete focus rectangle for transparent channel if( m_bFocusRect && ( m_bTransparentChannel || !m_bChannel ) ) { dc.DrawFocusRect( m_rect ); m_bFocusRect = FALSE; } // Draw channel if( m_bChannel ) { pbmTmp = dcMem.SelectObject( &m_bmChannel ); // There is a bitmap for active channel if( m_bChannelActive && (m_bEnable || (m_bThumbDisable && !m_bEnable))) { // Vertical slider if( m_bVertical ) { // Lower part DrawBitmap( &dc, 0, Pos2Pixel(m_nPos), m_nWidth, m_nHeight - Pos2Pixel(m_nPos), &dcMem, 0, Pos2Pixel(m_nPos), &m_bmChannelActiveMask, m_bTransparentChannel ); dcMem.SelectObject( &m_bmChannelActive ); // Upper part DrawBitmap( &dc, 0, 0, m_nWidth, Pos2Pixel(m_nPos), &dcMem, 0, 0, &m_bmChannelMask, m_bTransparentChannel ); // Horizontal slider } else { // Right side DrawBitmap( &dc, Pos2Pixel(m_nPos), 0, m_nWidth - Pos2Pixel(m_nPos), m_nHeight, &dcMem, Pos2Pixel(m_nPos), 0, &m_bmChannelActiveMask, m_bTransparentChannel ); dcMem.SelectObject( &m_bmChannelActive ); // Left side DrawBitmap( &dc, 0, 0, Pos2Pixel(m_nPos), m_nHeight, &dcMem, 0, 0, &m_bmChannelMask, m_bTransparentChannel ); } // Only one bitmap for channel } else { DrawBitmap( &dc, 0, 0, m_nWidth, m_nHeight, &dcMem, 0, 0, &m_bmChannelMask, m_bTransparentChannel ); } dcMem.SelectObject( pbmTmp ); } // If there is a bitmap to restore background image of a thumb if( m_nThumbBgX != -1 ) { RestoreBackground( &dc, m_nThumbBgX, m_nThumbBgY, m_nThumbWidth, m_nThumbHeight, &m_bmThumbBg ); m_nThumbBgX = -1; } // Draw thumb if( m_bThumb && (m_bEnable || (m_bThumbDisable && !m_bEnable))) { //if( m_bThumb ) { if( m_bThumbActive && m_bLButtonDown && m_bEnable) pbmTmp = dcMem.SelectObject( &m_bmThumbActive ); // Active thumb else if(m_bThumbDisable && !m_bEnable) pbmTmp = dcMem.SelectObject( &m_bmThumbDisable ); // Disable thumb else pbmTmp = dcMem.SelectObject( &m_bmThumb ); // Normal thumb // Vertical slider if( m_bVertical ) { // Background image is need to be restored if( m_bTransparentChannel || !m_bChannel ) { m_nThumbBgX = m_nMarginLeft; m_nThumbBgY = Pos2Pixel(m_nPos) - m_nThumbHeight/2; CopyBackground( &dc, m_nThumbBgX, m_nThumbBgY, m_nThumbWidth, m_nThumbHeight, &m_bmThumbBg ); } DrawBitmap( &dc, m_nMarginLeft, Pos2Pixel(m_nPos) - m_nThumbHeight/2, m_nThumbWidth, m_nThumbHeight, &dcMem, 0, 0, &m_bmThumbMask, m_bTransparentThumb ); // Horizontal slider } else { // Background image is need to be restored if( m_bTransparentChannel || !m_bChannel ) { m_nThumbBgX = Pos2Pixel(m_nPos) - m_nThumbWidth/2; m_nThumbBgY = m_nMarginTop; CopyBackground( &dc, m_nThumbBgX, m_nThumbBgY, m_nThumbWidth, m_nThumbHeight, &m_bmThumbBg ); } DrawBitmap( &dc, Pos2Pixel(m_nPos) - m_nThumbWidth/2, m_nMarginTop, m_nThumbWidth, m_nThumbHeight, &dcMem, 0, 0, &m_bmThumbMask, m_bTransparentThumb ); } // if horizontal dcMem.SelectObject( pbmTmp ); } // if draw thumb // Draw focus rectangle if( m_bDrawFocusRect && m_bFocus && m_bEnable ) { dc.DrawFocusRect( m_rect ); m_bFocusRect = TRUE; } dcMem.DeleteDC(); } // Sets the maximum range for the slider. // // Parameters: // [IN] nMax // Maximum position for the slider. // [IN] bRedraw // TRUE to redraw after the range is set. // FALSE to only change maximum position. // void CBitmapSlider::SetRangeMax(int nMax, BOOL bRedraw) { m_nMax = nMax; if( bRedraw ) Invalidate(); } // Sets the minimum range for the slider. // // Parameters: // [IN] nMin // Minimum position for the slider. // [IN] bRedraw // TRUE to redraw after the range is set. // FALSE to only change minimum position. // void CBitmapSlider::SetRangeMin(int nMin, BOOL bRedraw) { m_nMin = nMin; if( bRedraw ) Invalidate(); } // Sets the range (minimum and maximum positions) for the slider. // // Parameters: // [IN] nMin // Minimum position for the slider. // [IN] nMax // Maximum position for the slider. // [IN] bRedraw // TRUE to redraw after the range is set. // FALSE to only change the range. // void CBitmapSlider::SetRange(int nMin, int nMax, BOOL bRedraw) { SetRangeMin( nMin, FALSE ); SetRangeMax( nMax, bRedraw ); } // Sets the current position of the slider. // // Parameters: // [IN] nPos // Specifies the new slider position. // void CBitmapSlider::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(); } // Sets the size of the page for a control. // // Parameters: // [IN] nSize // The new page size of the control. // // Return value: // The previous page size. // int CBitmapSlider::SetPageSize(int nSize) { int nRet = m_nPage; m_nPage = nSize; return nRet; } // Sets the left, top, right, and bottom margins for a control // void CBitmapSlider::SetMargin(int nLeft, int nTop, int nRight, int nBottom ) { SetMarginLeft( nLeft ); SetMarginTop( nTop ); SetMarginRight( nRight ); SetMarginBottom( nBottom ); } // Enables or disables control. // // [IN] bEnable // TRUE to enable control. // FALSE to disable control. // void CBitmapSlider::Enable(BOOL bEnable) { m_bEnable = bEnable; // If control is disabled during dragging if( !m_bEnable && m_bLButtonDown ) { m_bLButtonDown = FALSE; ReleaseCapture(); } Invalidate(); } // Specify whether draw focus rectangle or not. // // [IN] bDraw // TRUE to draw focus rectangle. // FALSE to hide focus rectangle. // // [IN] bRedraw // TRUE to redraw status is changed. // FALSE to only change the status. // void CBitmapSlider::DrawFocusRect(BOOL bDraw, BOOL bRedraw) { m_bDrawFocusRect = bDraw; if( bRedraw ) Invalidate(); } // Load bitmaps for a channel // //