doclistcombobox.cpp

来自「windows ce开发技巧与实例光盘代码」· C++ 代码 · 共 261 行

// DocListComboBox.cpp : implementation file
//
#include "stdafx.h"
#include "resource.h"
#include "DocListComboBox.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDocListComboBox

CDocListComboBox::CDocListComboBox()
{
	m_strTitle = _T("Sort By");
	m_strSelectedText = _T("Name");
	m_strCurrentText = m_strSelectedText;
	m_bBorderState = FALSE;
	m_clrBackground = ::GetSysColor(COLOR_3DFACE);
	m_nLeftShift = 2;
	m_nIconWidth = 0;
	m_nDownWidth = 14;
	m_bDownState = FALSE;
	m_bBorderState = FALSE;
	m_pMenuOwner = NULL;
	m_bLeftAlign = TRUE;
}

CDocListComboBox::~CDocListComboBox()
{
	if (m_pMenuOwner) {
		delete m_pMenuOwner;
	}
}


BEGIN_MESSAGE_MAP(CDocListComboBox, CStatic)
	//{{AFX_MSG_MAP(CDocListComboBox)
	ON_WM_PAINT()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDocListComboBox message handlers

void CDocListComboBox::OnPaint() 
{
	CPaintDC dc(this); // device context for painting

	CRect rect;
	GetClientRect(&rect);

	CFont font;
	CreateFont(font);
	CFont* pOldFont = dc.SelectObject(&font);

	dc.SetBkColor(m_clrBackground);

	CSize szText = dc.GetTextExtent(m_strCurrentText);
	m_nTestWidth = szText.cx;
	int nTextYShift = (rect.Height() - szText.cy)/2;

	int nTextXShift = GetLeftAlignShift() + m_nLeftShift + m_nIconWidth;

	CRect rtText(CPoint(nTextXShift, nTextYShift), szText);
	dc.DrawText(m_strCurrentText, &rtText, DT_LEFT | DT_TOP | DT_SINGLELINE);

	DrawDownIcon(&dc);

	int nRight = GetLeftAlignShift()+m_nLeftShift+m_nIconWidth+m_nTestWidth+m_nDownWidth;
	int nLeft = GetLeftAlignShift();
	if (m_bBorderState) {
		dc.MoveTo(nLeft,0);
		dc.LineTo(nRight, 0);
		dc.LineTo(nRight, rect.bottom-1);
		dc.LineTo(nLeft, rect.bottom-1);
		dc.LineTo(nLeft, 0);
	}

	dc.SelectObject(pOldFont);
}

void CDocListComboBox::CreateFont(CFont &font)
{
	LOGFONT lf;
	
	memset(&lf, 0, sizeof(LOGFONT));
	
	lf.lfHeight = 16;
	lf.lfWeight = FW_BOLD;

	lstrcpy(lf.lfFaceName, CString(_T("Tahoma")));
	font.CreateFontIndirect(&lf);
}

void CDocListComboBox::OnLButtonDown(UINT nFlags, CPoint point) 
{
	SetCapture();
	if (
		(point.x<GetLeftAlignShift()+m_nLeftShift+m_nIconWidth+m_nTestWidth) &&
		(point.x>=GetLeftAlignShift())
	) {
		m_bBorderState = TRUE;
		Invalidate();
		UpdateWindow();
	} else {
		TrackDropDown();
	}

//	CStatic::OnLButtonDown(nFlags, point);
}

void CDocListComboBox::OnLButtonUp(UINT nFlags, CPoint point) 
{
	ReleaseCapture();
	if (m_bBorderState) {
		m_bBorderState = FALSE;

		CRect rect;
		GetClientRect(&rect);
		CRect rtName(CPoint(GetLeftAlignShift(),0), CSize(m_nLeftShift+m_nIconWidth+m_nTestWidth, rect.Height()));
		if (rtName.PtInRect(point)) {
			TrackDropDown();
		} else {
			Invalidate();
			UpdateWindow();
		}
	}

//	CStatic::OnLButtonUp(nFlags, point);
}

BOOL CDocListComboBox::OnEraseBkgnd(CDC* pDC) 
{
	CRect rect;
	GetClientRect(&rect);
	
	CBrush brush;
	brush.CreateSolidBrush(m_clrBackground);

	pDC->FillRect(&rect, &brush);

	return CStatic::OnEraseBkgnd(pDC);
}

void CDocListComboBox::DrawDownIcon(CDC *pDC)
{
	ASSERT(pDC);

	CRect rect;
	GetClientRect(&rect);
	int nXShift = GetLeftAlignShift() + m_nLeftShift + m_nIconWidth + m_nTestWidth;
	int nX = nXShift + (m_nDownWidth-7)/2;
	int nY = rect.bottom/2 + 0;
	
	pDC->MoveTo(nX+0, nY);
	pDC->LineTo(nX+7, nY);
	pDC->MoveTo(nX+1, nY+1);
	pDC->LineTo(nX+6, nY+1);
	pDC->MoveTo(nX+2, nY+2);
	pDC->LineTo(nX+5, nY+2);
	pDC->MoveTo(nX+3, nY+3);
	pDC->LineTo(nX+4, nY+3);
}

void CDocListComboBox::TrackDropDown()
{
	m_bDownState = TRUE;
	m_strCurrentText = m_strTitle;

	Invalidate();
	UpdateWindow();

	CRect rect;
	GetClientRect(&rect);
	ClientToScreen(&rect);

	if (m_pMenuOwner) {
		CMenu *pDropDownMenu = m_pMenuOwner->GetSubMenu(0);
		if (pDropDownMenu) {
			pDropDownMenu->TrackPopupMenu(TPM_LEFTALIGN, GetLeftAlignShift() + rect.left, rect.bottom, GetParent(), NULL);
		}
	}

	m_bDownState = FALSE;
	m_strCurrentText = m_strSelectedText;

	Invalidate();
	UpdateWindow();
}

BOOL CDocListComboBox::SetDropDownMenu(UINT nIDResource)
{
	if (m_pMenuOwner) {
		delete m_pMenuOwner;
		m_pMenuOwner = NULL;
	}

	m_pMenuOwner = new CMenu;
	BOOL bResult = m_pMenuOwner->LoadMenu(nIDResource);
	if (bResult) {
		return TRUE;
	} else {
		return FALSE;
	}
}

BOOL CDocListComboBox::SetDropDownMenu(CMenu *pMenuOwner)
{
	if (m_pMenuOwner) {
		delete m_pMenuOwner;
		m_pMenuOwner = NULL;
	}

	m_pMenuOwner = pMenuOwner;
	return TRUE;
}

void CDocListComboBox::SetTitleText(const CString &strTitleText)
{
	m_strTitle = strTitleText;

	if (m_bDownState) {
		m_strCurrentText = m_strTitle;
		Invalidate();
		UpdateWindow();
	}
}

void CDocListComboBox::SetSelectedText(const CString &strSelectedText)
{
	m_strSelectedText = strSelectedText;
	if (!m_bDownState) {
		m_strCurrentText = m_strSelectedText;
		Invalidate();
		UpdateWindow();
	}
}

void CDocListComboBox::SetAlign(BOOL bLeftAlign)
{
	m_bLeftAlign = bLeftAlign;
}

int CDocListComboBox::GetLeftAlignShift()
{
	if (m_bLeftAlign) {
		return 0;
	} else {
		CRect rect;
		GetClientRect(&rect);
		return rect.Width() - m_nLeftShift - m_nIconWidth - m_nTestWidth - m_nDownWidth-1;
	}
}