winscp/libs/mfc/source/winbtn.cpp

// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"

#ifdef AFX_AUX_SEG
#pragma code_seg(AFX_AUX_SEG)
#endif

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

#define new DEBUG_NEW

/////////////////////////////////////////////////////////////////////////////
// CBitmapButton

// LoadBitmaps will load in one, two, three or all four bitmaps
// returns TRUE if all specified images are loaded
BOOL CBitmapButton::LoadBitmaps(LPCTSTR lpszBitmapResource,
	LPCTSTR lpszBitmapResourceSel, LPCTSTR lpszBitmapResourceFocus,
	LPCTSTR lpszBitmapResourceDisabled)
{
	// delete old bitmaps (if present)
	m_bitmap.DeleteObject();
	m_bitmapSel.DeleteObject();
	m_bitmapFocus.DeleteObject();
	m_bitmapDisabled.DeleteObject();

	if (!m_bitmap.LoadBitmap(lpszBitmapResource))
	{
		TRACE0("Failed to load bitmap for normal image.\n");
		return FALSE;   // need this one image
	}
	BOOL bAllLoaded = TRUE;
	if (lpszBitmapResourceSel != NULL)
	{
		if (!m_bitmapSel.LoadBitmap(lpszBitmapResourceSel))
		{
			TRACE0("Failed to load bitmap for selected image.\n");
			bAllLoaded = FALSE;
		}
	}
	if (lpszBitmapResourceFocus != NULL)
	{
		if (!m_bitmapFocus.LoadBitmap(lpszBitmapResourceFocus))
			bAllLoaded = FALSE;
	}
	if (lpszBitmapResourceDisabled != NULL)
	{
		if (!m_bitmapDisabled.LoadBitmap(lpszBitmapResourceDisabled))
			bAllLoaded = FALSE;
	}
	return bAllLoaded;
}

// SizeToContent will resize the button to the size of the bitmap
void CBitmapButton::SizeToContent()
{
	ASSERT(m_bitmap.m_hObject != NULL);
	CSize bitmapSize;
	BITMAP bmInfo;
	VERIFY(m_bitmap.GetObject(sizeof(bmInfo), &bmInfo) == sizeof(bmInfo));
	VERIFY(SetWindowPos(NULL, -1, -1, bmInfo.bmWidth, bmInfo.bmHeight,
		SWP_NOMOVE|SWP_NOZORDER|SWP_NOREDRAW|SWP_NOACTIVATE));
}

// Autoload will load the bitmap resources based on the text of
//  the button
// Using suffices "U", "D", "F" and "X" for up/down/focus/disabled
BOOL CBitmapButton::AutoLoad(UINT nID, CWnd* pParent)
{
	// first attach the CBitmapButton to the dialog control
	if (!SubclassDlgItem(nID, pParent))
		return FALSE;

	CString buttonName;
	GetWindowText(buttonName);
	ASSERT(!buttonName.IsEmpty());      // must provide a title

	LoadBitmaps(buttonName + _T("U"), buttonName + _T("D"),
	  buttonName + _T("F"), buttonName + _T("X"));

	// we need at least the primary
	if (m_bitmap.m_hObject == NULL)
		return FALSE;

	// size to content
	SizeToContent();
	return TRUE;
}

// Draw the appropriate bitmap
void CBitmapButton::DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
	ASSERT(lpDIS != NULL);
	// must have at least the first bitmap loaded before calling DrawItem
	ASSERT(m_bitmap.m_hObject != NULL);     // required

	// use the main bitmap for up, the selected bitmap for down
	CBitmap* pBitmap = &m_bitmap;
	UINT state = lpDIS->itemState;
	if ((state & ODS_SELECTED) && m_bitmapSel.m_hObject != NULL)
		pBitmap = &m_bitmapSel;
	else if ((state & ODS_FOCUS) && m_bitmapFocus.m_hObject != NULL)
		pBitmap = &m_bitmapFocus;   // third image for focused
	else if ((state & ODS_DISABLED) && m_bitmapDisabled.m_hObject != NULL)
		pBitmap = &m_bitmapDisabled;   // last image for disabled

	// draw the whole button
	CDC* pDC = CDC::FromHandle(lpDIS->hDC);
	CDC memDC;
	memDC.CreateCompatibleDC(pDC);
	CBitmap* pOld = memDC.SelectObject(pBitmap);
	if (pOld == NULL)
		return;     // destructors will clean up

	CRect rect;
	rect.CopyRect(&lpDIS->rcItem);
	pDC->BitBlt(rect.left, rect.top, rect.Width(), rect.Height(),
		&memDC, 0, 0, SRCCOPY);
	memDC.SelectObject(pOld);
}

/////////////////////////////////////////////////////////////////////////////
// CBitmapButton diagnostics
#ifdef _DEBUG
void CBitmapButton::AssertValid() const
{
	CButton::AssertValid();

	m_bitmap.AssertValid();
	m_bitmapSel.AssertValid();
	m_bitmapFocus.AssertValid();
	m_bitmapDisabled.AssertValid();
}

void CBitmapButton::Dump(CDumpContext& dc) const
{
	CButton::Dump(dc);

	dc << "m_bitmap = " << (UINT)m_bitmap.m_hObject;
	dc << "\nm_bitmapSel = " << (UINT)m_bitmapSel.m_hObject;
	dc << "\nm_bitmapFocus = " << (UINT)m_bitmapFocus.m_hObject;
	dc << "\nm_bitmapDisabled = " << (UINT)m_bitmapDisabled.m_hObject;

	dc << "\n";
}
#endif

#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif

IMPLEMENT_DYNAMIC(CBitmapButton, CButton)

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