btnst.cpp

C++编程实践与技巧一书各章节的源码

// BtnST.cpp : implementation file
//

#include "stdafx.h"
#include "BtnST.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CButtonST

CButtonST::CButtonST()
{
	m_MouseOnButton = FALSE;

	m_hIconIn = NULL;
	m_hIconOut = NULL;
	m_cxIcon = 0;
	m_cyIcon = 0;
	m_hCursor = NULL;
  
	//默认类型为平面按钮
	m_bIsFlat = TRUE; 
    //平面按钮中默认绘制边界
	m_bDrawBorder = TRUE; 
  	//默认图标水平对齐
	m_nAlign = ST_ALIGN_HORIZ; 
  	// 默认显示按钮文本
	m_bShowText = TRUE; 
   // 对平面按钮，默认不绘制焦点边框
	m_bDrawFlatFocus = FALSE;
	//默认情况下，该按钮不是缺省按钮
	m_bIsDefault = FALSE;


	// 不产生提示信息
	m_ToolTip.m_hWnd = NULL;

	//不绘制透明按钮
	m_bDrawTransparent = FALSE;
	m_pbmpOldBk = NULL;
} // End of CButtonST


CButtonST::~CButtonST()
{
	// Restore old bitmap (if any)
	if (m_dcBk.m_hDC != NULL && m_pbmpOldBk != NULL)
	{
		m_dcBk.SelectObject(m_pbmpOldBk);
	}

	
} // End of ~CButtonST


BEGIN_MESSAGE_MAP(CButtonST, CButton)
    //{{AFX_MSG_MAP(CButtonST)
	ON_WM_CAPTURECHANGED()
	ON_WM_SETCURSOR()
	ON_WM_KILLFOCUS()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/*
设置按钮图标
参数nIconInId为鼠标在按钮上时需要显示的图标资源ID
参数nIconOutId为鼠标不在按钮上时需要显示的图标资源ID
*/
void CButtonST::SetIcon(int nIconInId, int nIconOutId)
{
	HINSTANCE hInstResource = AfxFindResourceHandle(MAKEINTRESOURCE(nIconInId),
													RT_GROUP_ICON);
	//当鼠标在按钮上时设置图标
	m_hIconIn = (HICON)::LoadImage(hInstResource/*AfxGetApp()->m_hInstance*/, MAKEINTRESOURCE(nIconInId), IMAGE_ICON, 0, 0, 0);
  
	//当鼠标不在按钮上时设置图标
	m_hIconOut = (nIconOutId == NULL) ? m_hIconIn : (HICON)::LoadImage(hInstResource/*AfxGetApp()->m_hInstance*/, MAKEINTRESOURCE(nIconOutId), IMAGE_ICON, 0, 0, 0);
  
	ICONINFO ii;

	//取得图标大小
	ZeroMemory(&ii, sizeof(ICONINFO));
	::GetIconInfo(m_hIconIn, &ii);

	m_cxIcon = (BYTE)(ii.xHotspot * 2);
	m_cyIcon = (BYTE)(ii.yHotspot * 2);

	RedrawWindow();
} // End of SetIcon

//设置光标，nCursorId为光标ID
BOOL CButtonST::SetBtnCursor(int nCursorId)
{
	HINSTANCE hInstResource;
	//销毁以前光标
	if (m_hCursor != NULL) ::DestroyCursor(m_hCursor);
	m_hCursor = NULL;

	//如果需要光标
	if (nCursorId != -1)
	{
		hInstResource = AfxFindResourceHandle(MAKEINTRESOURCE(nCursorId),
											RT_GROUP_CURSOR);
		//获取图标资源
		m_hCursor = (HCURSOR)::LoadImage(hInstResource/*AfxGetApp()->m_hInstance*/, MAKEINTRESOURCE(nCursorId), IMAGE_CURSOR, 0, 0, 0);
		
		if (m_hCursor == NULL) return FALSE;
	}

	return TRUE;
} // End of SetBtnCursor


//设置按钮类型。
//如果bState为TRUE，则按钮为平面类型；如果bState为FALSE，则按钮为标准类型。
void CButtonST::SetFlat(BOOL bState)
{
  m_bIsFlat = bState;
  Invalidate();
} // End of SetFlat

//获取按钮类型
BOOL CButtonST::GetFlat()
{
  return m_bIsFlat;
} // End of GetFlat

/*
设置按钮图标对齐方式
如果参数nAlign为ST_ALIGN_HORIZ，则按钮中图标在左，文字在右（默认方式）
如果参数nAlign为ST_ALIGN_VERT，则按钮中图标在上，文字在下
*/
void CButtonST::SetAlign(int nAlign)
{
  switch (nAlign)
  {    
    case ST_ALIGN_HORIZ:
         m_nAlign = ST_ALIGN_HORIZ;
         break;
    case ST_ALIGN_VERT:
         m_nAlign = ST_ALIGN_VERT;
         break;
  }
  Invalidate();
} // End of SetAlign

//获取对齐方式
int CButtonST::GetAlign()
{
  return m_nAlign;
} // End of GetAlign

//设置高亮开关
//如果bEnable为TRUE，则平面按钮自动高亮；如果为FALSE，则不高亮
void CButtonST::DrawBorder(BOOL bEnable)
{
  m_bDrawBorder = bEnable;
} // End of DrawBorder

//在运行状态下增加或删除按钮标题
//如果参数bShow，则显示按钮标题；如果为FALSE，则不显示
//鼠标移动时的事件响应函数
void CButtonST::OnMouseMove(UINT nFlags, CPoint point)
{
	CWnd* pWnd; 
	CWnd* pParent;

	CButton::OnMouseMove(nFlags, point);

	// If the mouse enter the button with the left button pressed
	// then do nothing
	if (nFlags & MK_LBUTTON && m_MouseOnButton == FALSE) return;

	// If our button is not flat then do nothing
	if (m_bIsFlat == FALSE) return;

	pWnd = GetActiveWindow();
	pParent = GetOwner();

	if ((GetCapture() != this) && 
		(
#ifndef ST_LIKEIE
		pWnd != NULL && 
#endif
		pParent != NULL)) 
	{
		m_MouseOnButton = TRUE;
		
		SetCapture();
		Invalidate();
	}
	else
	{

		POINT p2 = point;
		ClientToScreen(&p2);
		CWnd* wndUnderMouse = WindowFromPoint(p2);
		if (wndUnderMouse != this)
		{
			// Redraw only if mouse goes out
			if (m_MouseOnButton == TRUE)
			{
				m_MouseOnButton = FALSE;
				Invalidate();
			}
			// If user is NOT pressing left button then release capture!
			if (!(nFlags & MK_LBUTTON)) ReleaseCapture();
		}
	}
} // End of OnMouseMove


void CButtonST::OnKillFocus(CWnd * pNewWnd)
{
  CButton::OnKillFocus(pNewWnd);

  // If our button is not flat then do nothing
  if (m_bIsFlat == FALSE) return;

  if (m_MouseOnButton == TRUE)
  {
    m_MouseOnButton = FALSE;
    Invalidate();
  }
} // End of OnKillFocus


void CButtonST::OnCaptureChanged(CWnd *pWnd) 
{
	if (m_MouseOnButton == TRUE)
	{
		ReleaseCapture();
		Invalidate();
	}

	// Call base message handler
	CButton::OnCaptureChanged(pWnd);
} // End of OnCaptureChanged


void CButtonST::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
#ifdef ST_USE_MEMDC
  CDC  *pdrawDC = CDC::FromHandle(lpDIS->hDC);
  CMemDC memDC(pdrawDC);
  CDC  *pDC = &memDC;
#else	
  CDC* pDC = CDC::FromHandle(lpDIS->hDC);
#endif

  CPen *pOldPen;
  BOOL bIsPressed  = (lpDIS->itemState & ODS_SELECTED);
  BOOL bIsFocused  = (lpDIS->itemState & ODS_FOCUS);
  BOOL bIsDisabled = (lpDIS->itemState & ODS_DISABLED);

  CRect itemRect = lpDIS->rcItem;

  if (m_bIsFlat == FALSE)
  {
    if (bIsFocused || (GetDefault() == TRUE))
    {
      CBrush br(RGB(0,0,0));  
      pDC->FrameRect(&itemRect, &br);
      itemRect.DeflateRect(1, 1);
    }
  }

  COLORREF bgColor;
	CBrush br(bgColor);
	// Draw transparent?
	if (m_bDrawTransparent == TRUE)
	{
		PaintBk(pDC);
	}
	else
	{
		pDC->FillRect(&itemRect, &br);
	}
  if (bIsPressed)
  {
    if (m_bIsFlat == TRUE)
    {
      if (m_bDrawBorder == TRUE)
      {
	    CPen penBtnHiLight(PS_SOLID, 0, GetSysColor(COLOR_BTNHILIGHT)); // Bianco
        CPen penBtnShadow(PS_SOLID, 0, GetSysColor(COLOR_BTNSHADOW));   // Grigio scuro

        // 暗灰线
        pOldPen = pDC->SelectObject(&penBtnShadow);
        pDC->MoveTo(itemRect.left, itemRect.bottom-1);
        pDC->LineTo(itemRect.left, itemRect.top);
        pDC->LineTo(itemRect.right, itemRect.top);
        //白线
        pDC->SelectObject(penBtnHiLight);
        pDC->MoveTo(itemRect.left, itemRect.bottom-1);
        pDC->LineTo(itemRect.right-1, itemRect.bottom-1);
        pDC->LineTo(itemRect.right-1, itemRect.top-1);
        //
        pDC->SelectObject(pOldPen);
      }
    }
    else    
    {
      CBrush brBtnShadow(GetSysColor(COLOR_BTNSHADOW));
      pDC->FrameRect(&itemRect, &brBtnShadow);
    }
  }
  else // ...else draw non pressed button
  {
    CPen penBtnHiLight(PS_SOLID, 0, GetSysColor(COLOR_BTNHILIGHT)); // White
    CPen pen3DLight(PS_SOLID, 0, GetSysColor(COLOR_3DLIGHT));       // Light gray
    CPen penBtnShadow(PS_SOLID, 0, GetSysColor(COLOR_BTNSHADOW));   // Dark gray
    CPen pen3DDKShadow(PS_SOLID, 0, GetSysColor(COLOR_3DDKSHADOW)); // Black

    if (m_bIsFlat == TRUE)
    {
      if (m_MouseOnButton == TRUE && m_bDrawBorder == TRUE)
      {
  	    //白线
        pOldPen = pDC->SelectObject(&penBtnHiLight);
        pDC->MoveTo(itemRect.left, itemRect.bottom-1);
        pDC->LineTo(itemRect.left, itemRect.top);
        pDC->LineTo(itemRect.right, itemRect.top);
        //暗灰线
        pDC->SelectObject(penBtnShadow);
        pDC->MoveTo(itemRect.left, itemRect.bottom-1);
        pDC->LineTo(itemRect.right-1, itemRect.bottom-1);
        pDC->LineTo(itemRect.right-1, itemRect.top-1);
        //
        pDC->SelectObject(pOldPen);
      }
    }
    else
    {
      //白线
      pOldPen = pDC->SelectObject(&penBtnHiLight);
      pDC->MoveTo(itemRect.left, itemRect.bottom-1);
      pDC->LineTo(itemRect.left, itemRect.top);
      pDC->LineTo(itemRect.right, itemRect.top);
      //亮灰线
      pDC->SelectObject(pen3DLight);
      pDC->MoveTo(itemRect.left+1, itemRect.bottom-1);
      pDC->LineTo(itemRect.left+1, itemRect.top+1);
      pDC->LineTo(itemRect.right, itemRect.top+1);
      //黑线
      pDC->SelectObject(pen3DDKShadow);
      pDC->MoveTo(itemRect.left, itemRect.bottom-1);
      pDC->LineTo(itemRect.right-1, itemRect.bottom-1);
      pDC->LineTo(itemRect.right-1, itemRect.top-1);
      //暗灰线
      pDC->SelectObject(penBtnShadow);
      pDC->MoveTo(itemRect.left+1, itemRect.bottom-2);
      pDC->LineTo(itemRect.right-2, itemRect.bottom-2);
      pDC->LineTo(itemRect.right-2, itemRect.top);
      pDC->SelectObject(pOldPen);
    }
  }

  //取得按钮标题
  CString sTitle;
  GetWindowText(sTitle);

  //如果不希望显示按钮标题
  if (m_bShowText == FALSE) sTitle.Empty();

  CRect captionRect = lpDIS->rcItem;

  //绘制图标
  if (m_hIconIn != NULL)
  {
    DrawTheIcon(pDC, &sTitle, &lpDIS->rcItem, &captionRect, bIsPressed, bIsDisabled);
  }

  //
  if (sTitle.IsEmpty() == FALSE)
  {
    if (bIsPressed)
      captionRect.OffsetRect(1, 1);
    
    
#ifdef ST_USE_MEMDC
	//取得对话框字体
    CFont *pCurrentFont = GetFont(); 
    CFont *pOldFont = pDC->SelectObject(pCurrentFont);
#endif
    CRect centerRect = captionRect;
    pDC->DrawText(sTitle, -1, captionRect, DT_SINGLELINE|DT_CALCRECT);
    captionRect.OffsetRect((centerRect.Width() - captionRect.Width())/2, (centerRect.Height() - captionRect.Height())/2);
	pDC->SetBkMode(TRANSPARENT);
    pDC->DrawState(captionRect.TopLeft(), captionRect.Size(), (LPCTSTR)sTitle, (bIsDisabled ? DSS_DISABLED : DSS_NORMAL), 
                   TRUE, 0, (CBrush*)NULL);
#ifdef ST_USE_MEMDC
    pDC->SelectObject(pOldFont);
#endif
  }

  if (m_bIsFlat == FALSE || (m_bIsFlat == TRUE && m_bDrawFlatFocus == TRUE))
  {
    //绘制焦点框
    if (bIsFocused)
    {
      CRect focusRect = itemRect;
      focusRect.DeflateRect(3, 3);
      pDC->DrawFocusRect(&focusRect);
    }
  }
} // End of DrawItem


void CButtonST::DrawTheIcon(CDC* pDC, CString* title, RECT* rcItem, CRect* captionRect, BOOL IsPressed, BOOL IsDisabled)
{
  CRect iconRect = rcItem;

  switch (m_nAlign)
  {
    case ST_ALIGN_HORIZ:
         if (title->IsEmpty())
         {
           //水平放置图标
           iconRect.left += ((iconRect.Width() - m_cxIcon)/2);
         }
         else
         {
           iconRect.left += 3;  
           captionRect->left += m_cxIcon + 3;
         }
         //垂直放置图标
         iconRect.top += ((iconRect.Height() - m_cyIcon)/2);
         break;
    case ST_ALIGN_VERT:
		//水平放置图标
         iconRect.left += ((iconRect.Width() - m_cxIcon)/2);
         if (title->IsEmpty())
         {
           //垂直放置图标
           iconRect.top += ((iconRect.Height() - m_cyIcon)/2);           
         }
         else
         {
           captionRect->top += m_cyIcon;
         }
         break;
  }
    
  if (IsPressed) iconRect.OffsetRect(1, 1);
  pDC->DrawState(iconRect.TopLeft(), 
	               iconRect.Size(), 
				         (m_MouseOnButton == TRUE || IsPressed) ? m_hIconIn : m_hIconOut, 
				         (IsDisabled ? DSS_DISABLED : DSS_NORMAL), 
                 (CBrush*)NULL);
} // End of DrawTheIcon


void CButtonST::PreSubclassWindow() 
{
	UINT nBS;

	nBS = GetButtonStyle();

	if (nBS & BS_DEFPUSHBUTTON) m_bIsDefault = TRUE;

	// Add BS_OWNERDRAW style
	SetButtonStyle(nBS | BS_OWNERDRAW);

	CButton::PreSubclassWindow();
} // End of PreSubclassWindow


BOOL CButtonST::PreTranslateMessage(MSG* pMsg) 
{
	
	return CButton::PreTranslateMessage(pMsg);
} // End of PreTranslateMessage


LRESULT CButtonST::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
{
	if (message == WM_LBUTTONDBLCLK)
	{
		message = WM_LBUTTONDOWN;
	}
	return CButton::DefWindowProc(message, wParam, lParam);
} // End of DefWindowProc



//设置平面按钮焦点框
//如果参数bDrawFlatFocus为TRUE，则平面按钮有焦点框；否则没有
//如果参数bRepaint为TRUE，则按钮立即重画
void CButtonST::SetFlatFocus(BOOL bDrawFlatFocus, BOOL bRepaint)
{
	m_bDrawFlatFocus = bDrawFlatFocus;
	if (bRepaint == TRUE) Invalidate();
} // End of SetFlatFocus


BOOL CButtonST::GetFlatFocus()
{
	return m_bDrawFlatFocus;
} // End of GetFlatFocus


BOOL CButtonST::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	if (m_hCursor != NULL)
	{
		::SetCursor(m_hCursor);
		return TRUE;
	}

	return CButton::OnSetCursor(pWnd, nHitTest, message);
} // End of OnSetCursor


BOOL CButtonST::GetDefault()
{
	return m_bIsDefault;
} // End of GetDefault


void CButtonST::DrawTransparent()
{
	m_bDrawTransparent = TRUE;
} // End of DrawTransparent


void CButtonST::PaintBk(CDC * pDC)
{
	CClientDC clDC(GetParent());
	CRect rect;
	CRect rect1;

	GetClientRect(rect);

	GetWindowRect(rect1);
	GetParent()->ScreenToClient(rect1);

	if (m_dcBk.m_hDC == NULL)
	{
		m_dcBk.CreateCompatibleDC(&clDC);
		m_bmpBk.CreateCompatibleBitmap(&clDC, rect.Width(), rect.Height());
		m_pbmpOldBk = m_dcBk.SelectObject(&m_bmpBk);
		m_dcBk.BitBlt(0, 0, rect.Width(), rect.Height(), &clDC, rect1.left, rect1.top, SRCCOPY);
	}

	pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &m_dcBk, 0, 0, SRCCOPY);
} // End of PaintBk


#undef ST_USE_MEMDC
#undef ST_LIKEIE