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包含位图和文本的按钮


日期: 2001-12-16 14:00 | 联系我 | 关注我: Google+ | Twitter | 新浪微博

 

本程序介绍一个从CButton类派生的类CSXButton,用于将文本和图像一起放置在按钮上。读者知道,MFC CButton类只允许放置图像或者文本,而不能把两者都放置在上面。请参见下面的图例。

下面是类CSXButton的源程序。

头文件:

// SXButton.h : header file

// CSXButton window

#ifndef _SXBUTTON_H

#define _SXBUTTON_H

#define SXBUTTON_CENTER -1

class CSXButton : public CButton

{

// Construction

public:

CSXButton();

// Attributes

private:

// Positioning

BOOL m_bUseOffset;

CPoint m_pointImage;

CPoint m_pointText;

int m_nImageOffsetFromBorder;

int m_nTextOffsetFromImage;

// Image

HICON m_hIcon;

HBITMAP m_hBitmap;

HBITMAP m_hBitmapDisabled;

int m_nImageWidth, m_nImageHeight;

// Color Tab

char m_bColorTab;

COLORREF m_crColorTab;

// State

BOOL m_bDefault;

UINT m_nOldAction;

UINT m_nOldState;

// Operations

public:

// Positioning

int SetImageOffset( int nPixels );

int SetTextOffset( int nPixels );

CPoint SetImagePos( CPoint p );

CPoint SetTextPos( CPoint p );

// Image

BOOL SetIcon( UINT nID, int nWidth, int nHeight );

BOOL SetBitmap( UINT nID, int nWidth, int nHeight );

BOOL SetMaskedBitmap( UINT nID, int nWidth, int nHeight, COLORREF crTransparentMask );

BOOL HasImage() { return (BOOL)( m_hIcon != 0 | m_hBitmap != 0 ); }

// Color Tab

void SetColorTab(COLORREF crTab);

// State

BOOL SetDefaultButton( BOOL bState = TRUE );

private:

BOOL SetBitmapCommon( UINT nID, int nWidth, int nHeight, COLORREF crTransparentMask, BOOL bUseMask );

void CheckPointForCentering( CPoint &p, int nWidth, int nHeight );

void Redraw();

// Overrides

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CSXButton)

public:

virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

//}}AFX_VIRTUAL

// Implementation

public:

virtual ~CSXButton();

// Generated message map functions

protected:

//{{AFX_MSG(CSXButton)

afx_msg LRESULT OnGetText(WPARAM wParam, LPARAM lParam);

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

#endif

/////////////////////////////////////////////////////////////////////////////

实现文件:

// SXButton.cpp : implementation file

//

///////////////////////////////////////////////////////////////

#include "stdafx.h"

#include <SXButton.h> // Access non-local header (in a library)

//#include "SXButton.h" // Access local header

#ifdef _DEBUG

#define new DEBUG_NEW

#undef THIS_FILE

static char THIS_FILE[] = __FILE__;

#endif

/////////////////////////////////////////////////////////////////////////////

// CSXButton

CSXButton::CSXButton()

{

m_bColorTab = FALSE;

m_hIcon = 0;

m_hBitmap = 0;

m_hBitmapDisabled = 0;

m_bDefault = FALSE;

m_nOldState = 0;

m_nOldAction = 0;

m_nImageOffsetFromBorder = 4;

m_nTextOffsetFromImage = 8;

m_bUseOffset = TRUE;

}

CSXButton::~CSXButton()

{

if( m_hIcon != 0 )

DeleteObject( m_hIcon );

if( m_hBitmap != 0 )

DeleteObject( m_hBitmap );

if( m_hBitmapDisabled != 0 )

DeleteObject( m_hBitmapDisabled );

}

BEGIN_MESSAGE_MAP(CSXButton, CButton)

//{{AFX_MSG_MAP(CSXButton)

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

inline void CSXButton::Redraw()

{

if( m_hWnd != NULL )

Invalidate();

}

//

// Various Attribute setting functions

//

// Image functions

BOOL CSXButton::SetIcon( UINT nID, int nWidth, int nHeight )

{

// GS980730 added AfxFindResourceHandle to make MFC find resources in DLLs too...

HINSTANCE hInstResource = AfxFindResourceHandle(MAKEINTRESOURCE(nID),

RT_GROUP_ICON);

m_hIcon = (HICON)::LoadImage(hInstResource,

MAKEINTRESOURCE(nID),

IMAGE_ICON, nWidth, nHeight, 0);

if( m_hIcon == 0 )

return FALSE;

m_nImageWidth = nWidth;

m_nImageHeight = nHeight;

m_hBitmap = 0;

Redraw();

return TRUE;

}

BOOL CSXButton::SetBitmap( UINT nID, int nWidth, int nHeight )

{

return SetBitmapCommon( nID, nWidth, nHeight, 0, FALSE /* no mask */ );

}

BOOL CSXButton::SetMaskedBitmap( UINT nID, int nWidth, int nHeight, COLORREF crTransparentMask )

{

return SetBitmapCommon( nID, nWidth, nHeight, crTransparentMask, TRUE /* mask */ );

}

BOOL CSXButton::SetBitmapCommon( UINT nID, int nWidth, int nHeight, COLORREF crTransparentMask, BOOL bUseMask )

{

// GS980730 added AfxFindResourceHandle to make MFC find resources in DLLs too...

HINSTANCE hInstResource = AfxFindResourceHandle(MAKEINTRESOURCE(nID),

RT_BITMAP);

// If it is not a masked bitmap, just go through the

// motions as if it was, but set then number of color mappings to 0

COLORMAP mapColor;

mapColor.from = crTransparentMask;

mapColor.to = ::GetSysColor( COLOR_BTNFACE );

HBITMAP bmTemp = (HBITMAP)::CreateMappedBitmap(hInstResource, nID, IMAGE_BITMAP, &mapColor, bUseMask ? 1 : 0 );

m_hBitmap = (HBITMAP)::CopyImage( bmTemp, IMAGE_BITMAP, nWidth, nHeight, LR_COPYDELETEORG );

// Create disabled bitmap. We need to make the masked area white so

// it will appear transparent when the bitmap is rendered as an

// 'embossed' (disabled) image in DrawItem() below. Since DrawState

// converts the image to monochrome, white is transparent, black is

// graphics data.

mapColor.to = RGB( 255, 255, 255 );

bmTemp = (HBITMAP)::CreateMappedBitmap(hInstResource, nID, IMAGE_BITMAP, &mapColor, bUseMask ? 1 : 0 );

m_hBitmapDisabled = (HBITMAP)::CopyImage( bmTemp, IMAGE_BITMAP, nWidth, nHeight, LR_COPYDELETEORG );

if( m_hBitmap == 0 || m_hBitmapDisabled == 0 )

return FALSE;

m_nImageWidth = nWidth;

m_nImageHeight = nHeight;

m_hIcon = 0;

Redraw();

return TRUE;

}

void CSXButton::SetColorTab(COLORREF crTab)

{

m_bColorTab = TRUE;

m_crColorTab = crTab;

Redraw();

}

BOOL CSXButton::SetDefaultButton( BOOL bState )

{

CDialog *pDialog = (CDialog *)GetOwner();

// ASSERT( pDialog->IsKindOf( RUNTIME_CLASS( CDialog ) ) );

pDialog->SetDefID( GetDlgCtrlID() );

BOOL bPrevious = m_bDefault;

m_bDefault = bState;

Redraw();

// Return previous state

return bPrevious;

}

// Positioning Functions

int CSXButton::SetImageOffset( int nPixels )

{

int nPrevious = m_nImageOffsetFromBorder;

m_bUseOffset = TRUE;

m_nImageOffsetFromBorder = nPixels;

Redraw();

return nPrevious;

}

int CSXButton::SetTextOffset( int nPixels )

{

int nPrevious = m_nTextOffsetFromImage;

m_bUseOffset = TRUE;

m_nTextOffsetFromImage = nPixels;

Redraw();

return nPrevious;

}

CPoint CSXButton::SetImagePos( CPoint p )

{

CPoint pointPrevious = m_pointImage;

m_bUseOffset = FALSE;

m_pointImage = p;

Redraw();

return pointPrevious;

}

CPoint CSXButton::SetTextPos( CPoint p )

{

CPoint pointPrevious = m_pointText;

m_bUseOffset = FALSE;

m_pointText = p;

Redraw();

return pointPrevious;

}

// Centering a point helper function

void CSXButton::CheckPointForCentering( CPoint &p, int nWidth, int nHeight )

{

CRect rectControl;

GetClientRect( rectControl );

if( p.x == SXBUTTON_CENTER )

p.x = ( ( rectControl.Width() - nWidth ) >> 1 );

if( p.y == SXBUTTON_CENTER )

p.y = ( ( rectControl.Height() - nHeight ) >> 1 );

}

//

// Owner Draw function, the grand-daddy

//

void CSXButton::DrawItem(LPDRAWITEMSTRUCT lpDIS)

{

CDC* pDC = CDC::FromHandle(lpDIS->hDC);

CRect rectControl( lpDIS->rcItem );

UINT nOffset = 0; // For position adjustment of a pushed button

UINT nFrameStyle=0;

BOOL bDRAWFOCUSONLY = FALSE; // Optimize a bit

int nStateFlag; // Normal or Disabled

HBITMAP hBitmapToDraw; // Normal or Disabled bitmap (not used if uses icon)

UINT nNewState = lpDIS->itemState;

UINT nNewAction = lpDIS->itemAction;

// Find out what state the control and set some drawing flags

// according to the state.

if ( nNewState & ODS_SELECTED)

{

nFrameStyle = DFCS_PUSHED;

nOffset += 1;

}

if( nNewState & ODS_DISABLED )

{

nStateFlag = DSS_DISABLED;

hBitmapToDraw = m_hBitmapDisabled;

}

else

{

nStateFlag = DSS_NORMAL;

hBitmapToDraw = m_hBitmap;

}

// If only the focus is changing, don't redraw the whole control

if (nNewAction == ODA_FOCUS )

bDRAWFOCUSONLY = TRUE;

// If this is the defualt button, deflate the control so everything

// we do below (icon, text, focus ) is adjusted properly

if( m_bDefault )

rectControl.DeflateRect( 1, 1 );

if( !bDRAWFOCUSONLY )

{

//

// Draw 'default button' rectangle

//

if( m_bDefault ) // Can't use ODS_DEFAULT w/owner draw!!

{

CPen *pOldPen = (CPen*)pDC->SelectStockObject(BLACK_PEN);

pDC->Rectangle( &lpDIS->rcItem ); // don't use deflated rectangle

pDC->SelectObject( pOldPen );

}

//

// Draw button frame

//

pDC->DrawFrameControl(&rectControl, DFC_BUTTON, DFCS_BUTTONPUSH | nFrameStyle);

//

// Draw color tab

//

if (m_bColorTab)

{

CPen penTab;

#define COLORTABSIZE 8

if( penTab.CreatePen( PS_SOLID, 1, m_crColorTab) )

{

CPen* pOldPen = pDC->SelectObject( &penTab );

int nXOffset = rectControl.left+1 + nOffset;

int nYOffset = rectControl.top+1 + nOffset;

for (UINT nStep = 0; nStep < COLORTABSIZE; nStep++)

{

pDC->MoveTo( nXOffset, nYOffset + nStep );

pDC->LineTo( nXOffset + (COLORTABSIZE-nStep)-1, nYOffset + nStep );

}

pDC->SelectObject( pOldPen );

}

}

// Get control text

CString strTitle;

this->GetWindowText(strTitle);

//

// Draw Image

//

if( HasImage() )

{

CPoint pt;

if( m_bUseOffset )

{

pt.x = strTitle.IsEmpty() ? SXBUTTON_CENTER : rectControl.left + m_nImageOffsetFromBorder;

pt.y = SXBUTTON_CENTER;

}

else

pt = m_pointImage;

CheckPointForCentering( pt, m_nImageWidth, m_nImageHeight );

pt.Offset( nOffset, nOffset );

if( m_hIcon )

pDC->DrawState( pt, CSize(m_nImageWidth, m_nImageHeight), (HICON)m_hIcon, DST_ICON | nStateFlag, (CBrush *)NULL );

else if( m_hBitmap )

pDC->DrawState( pt, CSize(m_nImageWidth, m_nImageHeight), (HBITMAP)hBitmapToDraw, DST_BITMAP | nStateFlag );

}

//

// Draw Text

//

if ( !strTitle.IsEmpty() )

{

CPoint pt;

CSize sizeText = pDC->GetTextExtent(strTitle);

if( m_bUseOffset )

{

CRect rcClient;

GetClientRect(rcClient);

pt.x = !HasImage() ? SXBUTTON_CENTER :

m_nImageWidth + m_nTextOffsetFromImage + m_nImageOffsetFromBorder +

(max(0,rcClient.Width()-(m_nImageWidth + m_nTextOffsetFromImage + m_nImageOffsetFromBorder)-sizeText.cx)/2);

;

// pt.x = !HasImage() ? SXBUTTON_CENTER : m_nImageWidth + m_nTextOffsetFromImage + m_nImageOffsetFromBorder;

pt.y = SXBUTTON_CENTER;

}

else

pt = m_pointText;

// If we are centering the text vertically, it looks best of we

// center based on the height of the text, then move it up 1 more pixel

int nOffsetFixY = pt.y == SXBUTTON_CENTER ? -1 : 0;

CheckPointForCentering( pt, sizeText.cx, sizeText.cy );

pt.Offset( nOffset, nOffset + nOffsetFixY );

pDC->DrawState( pt, CSize(0,0), strTitle, DST_PREFIXTEXT|nStateFlag, TRUE, 0, (CBrush*)NULL );

}

} // End !focus only

//

// Draw focus rectange

//

if( !( nNewState & ODS_DISABLED ) ) // Make sure it's not disabled

{

// Redraw the focus if:

// 1. There is a change in focus state

// OR 2. The entire control was just redrawn and Focus is set

if( ( nNewState & ODS_FOCUS ) ^ ( m_nOldState & ODS_FOCUS ) ||

( !bDRAWFOCUSONLY && ( nNewState & ODS_FOCUS ) ) )

{

#define FOCUSOFFSET 3

CRect rect( rectControl );

// As control gets smaller, decrease focus size

int nDeflate = min( FOCUSOFFSET,

min( rect.Width(), rect.Height() ) >> 2 );

rect.DeflateRect( nDeflate, nDeflate);

pDC->DrawFocusRect(&rect);

}

}

m_nOldAction = nNewAction;

m_nOldState = nNewState;

}


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