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, 17 Jan 2008
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/////////////////////////////////////////////////////////////////////////////
// DropListBox.cpp : implementation file
// 
// CAdvComboBox Control
// Version: 2.1
// Date: September 2002
// Author: Mathias Tunared
// Email: Mathias@inorbit.com
// Copyright (c) 2002. All Rights Reserved.
//
// This code, in compiled form or as source code, may be redistributed 
// unmodified PROVIDING it is not sold for profit without the authors 
// written consent, and providing that this notice and the authors name 
// and all copyright notices remains intact.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage/loss of business that
// this product may cause.
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "DropListBox.h"
#include "AdvComboBox.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDropListBox

CDropListBox::CDropListBox( CWnd* pComboParent, CDropScrollBar* pScroll )
:
	m_pComboParent( pComboParent ),
	m_pScroll( pScroll )
{
	m_pListFont = new CFont;
	LOGFONT logFont;
	memset( &logFont, 0, sizeof(LOGFONT) );
	_tcscpy( logFont.lfFaceName, _T("MS Sans Serif") );
	logFont.lfHeight = 20;
	m_pListFont->CreateFontIndirect(&logFont);

	m_nLastTopIdx = 0;

	m_dwACBStyle = 0;

	m_bSelectDisabled = FALSE;
}

CDropListBox::~CDropListBox()
{
	delete m_pListFont;
}

BEGIN_MESSAGE_MAP(CDropListBox, CListBox)
	//{{AFX_MSG_MAP(CDropListBox)
	ON_WM_CREATE()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	//}}AFX_MSG_MAP
	ON_MESSAGE( WM_VRC_SETCAPTURE, OnSetCapture )
	ON_MESSAGE( WM_VRC_RELEASECAPTURE, OnReleaseCapture )
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDropListBox message handlers

int CDropListBox::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CListBox::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// Because this window doesn't have an owner, there will appear 
	// a 'blank' button on the taskbar. The following are to hide 
	// that 'blank' button on the taskbar
	ShowWindow( SW_HIDE );
	ModifyStyleEx( 0, WS_EX_TOOLWINDOW );// |WS_VSCROLL );//| WS_EX_NOACTIVATE ); // WS_EX_CONTROLPARENT
	ShowWindow( SW_SHOW );
	SetWindowPos( &wndTopMost, lpCreateStruct->x, lpCreateStruct->y, 
		lpCreateStruct->cx, lpCreateStruct->cy, SWP_SHOWWINDOW );

	SetFont( static_cast<CAdvComboBox*>(m_pComboParent)->GetFont() ); 
	return 0;
}

LONG CDropListBox::OnSetCapture( WPARAM /*wParam*/, LPARAM /*lParam*/ )
{
	SetCapture();
	return FALSE;
}

LONG CDropListBox::OnReleaseCapture( WPARAM /*wParam*/, LPARAM /*lParam*/ )
{
	ReleaseCapture();
	return FALSE;
}

void CDropListBox::OnMouseMove(UINT nFlags, CPoint point) 
{
	//
	// Is mouse within listbox
	CRect rcClient;
	GetClientRect( rcClient );
	if( !rcClient.PtInRect( point ) )
	{
		ReleaseCapture();
		GetParent()->SendMessage( WM_VRC_SETCAPTURE );
	}

	//
	// Set selection item under mouse
	int nPos = point.y / GetItemHeight(0) + GetTopIndex();
	PLIST_ITEM pItem = (PLIST_ITEM)GetItemDataPtr(nPos);
	if( (DWORD)pItem != -1 )
	{
		if( GetCurSel() != nPos && !pItem->bDisabled )
		{
			SetCurSel( nPos );
		}
	}

	//
	// Check if we have autoscrolled
	if( m_nLastTopIdx != GetTopIndex() )
	{
		//int nDiff = m_nLastTopIdx - GetTopIndex();
		m_nLastTopIdx = GetTopIndex();

		SCROLLINFO info;
		info.cbSize = sizeof(SCROLLINFO);
		if( m_pScroll->GetScrollInfo( &info, SIF_ALL|SIF_DISABLENOSCROLL ) )
		{
			info.nPos = m_nLastTopIdx;
			m_pScroll->SetScrollInfo( &info );
		}
	}

	CListBox::OnMouseMove(nFlags, point);
}

void CDropListBox::OnLButtonUp(UINT nFlags, CPoint point) 
{
	OnLButtonDown(nFlags, point);
//	CListBox::OnLButtonUp(nFlags, point);
}

void CDropListBox::OnLButtonDown(UINT /*nFlags*/, CPoint point) 
{
	//
	// Is mouse within listbox
	CRect rcClient;
	GetClientRect( rcClient );
	if( !rcClient.PtInRect( point ) )
	{
		ReleaseCapture();
		GetParent()->SendMessage( WM_VRC_SETCAPTURE );
	}

	//
	// Set selection item under mouse
	int nPos = point.y / GetItemHeight(0) + GetTopIndex();
	PLIST_ITEM pItem = (PLIST_ITEM)GetItemDataPtr(nPos);
	if( (DWORD)pItem != -1 )
	{
		if( pItem->bDisabled )
		{
			return;
		}
	}

	nPos = GetCurSel();

	//
	// Is selected item disabled
	if( nPos != LB_ERR )
	{
		PLIST_ITEM pItem;
		pItem = (PLIST_ITEM)GetItemDataPtr( nPos );
		if( pItem->bDisabled )
		{
			return;
		}
	}

	//
	// Send current selection to comboedit
	if( nPos != -1 )
		m_pComboParent->PostMessage( WM_SELECTED_ITEM, (WPARAM)nPos, 0 );

	//
	// Destroy dropdown
	ReleaseCapture();
	m_pComboParent->PostMessage( WM_DESTROY_DROPLIST );

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

int CDropListBox::GetBottomIndex()
{
	int nTop = GetTopIndex();
	CRect rc;
	GetClientRect( &rc );
	int nVisCount = rc.Height() / GetItemHeight(0);
	return nTop + nVisCount;
}

void CDropListBox::SetTopIdx(int nPos, BOOL bUpdateScrollbar)
{
	m_nLastTopIdx = nPos;
	SetTopIndex( nPos );
	if( bUpdateScrollbar )
	{
		SCROLLINFO info;
		info.cbSize = sizeof(SCROLLINFO);
		if( m_pScroll->GetScrollInfo( &info, SIF_ALL|SIF_DISABLENOSCROLL ) )
		{
			info.nPos = m_nLastTopIdx;
			m_pScroll->SetScrollInfo( &info );
		}
	}
}

void CDropListBox::GetTextSize(LPCTSTR lpszText, int nCount, CSize &size)
{
	CClientDC dc(this);
	int nSave = dc.SaveDC();
	dc.SelectObject( static_cast<CAdvComboBox*>(m_pComboParent)->GetFont() );
	size = dc.GetTextExtent( lpszText, nCount );
	if( m_dwACBStyle & ACBS_CHECKED )
	{
		size.cx += 14;
	}
	dc.RestoreDC(nSave);
}

int CDropListBox::AddListItem( LIST_ITEM& item )
{
	PLIST_ITEM pItem = new LIST_ITEM;
	*pItem = item;
	int nPos = AddString( pItem->strText.c_str() );
	SetItemDataPtr( nPos, (void*)pItem );
	return nPos;
}

BOOL CDropListBox::DestroyWindow() 
{
	PLIST_ITEM pItem;
	for( int i = 0; i < GetCount(); i++ )
	{
		pItem = (PLIST_ITEM)GetItemDataPtr( i );
		delete pItem;
	}
	
	return CListBox::DestroyWindow();
}

void CDropListBox::SetDLBStyle(DWORD dwStyle)
{
	m_dwACBStyle = dwStyle;
}

int CDropListBox::SetCurSel(int nSelect)
{
	PLIST_ITEM pItem = NULL;
	int nCur = GetCurSel();
	int nWay = nSelect - nCur;
	int nTmp = nSelect;
	if( !m_bSelectDisabled )
	{
		// Select the next in list the is NOT disabled
		if( nWay < 0 )
		{
			// Select previous in list
			pItem = (PLIST_ITEM)GetItemDataPtr( nTmp );
			while( (DWORD)pItem != -1 )
			{
				if( !pItem->bDisabled )
				{
					nSelect = nTmp;
					break;
				}
				nTmp--;
				pItem = (PLIST_ITEM)GetItemDataPtr( nTmp );
			}
		}
		else
		if( nWay > 0 )
		{
			// Select next in list
			pItem = (PLIST_ITEM)GetItemDataPtr( nTmp );
			while( (DWORD)pItem != -1 )
			{
				if( !pItem->bDisabled )
				{
					nSelect = nTmp;
					break;
				}
				nTmp++;
				pItem = (PLIST_ITEM)GetItemDataPtr( nTmp );
			}
		}
	}

	pItem = (PLIST_ITEM)GetItemDataPtr( nSelect);
	if( (DWORD)pItem != -1 )
	{
		if( pItem->bDisabled )
		{
			return nSelect;
		}
	}
	int nr = CListBox::SetCurSel( nSelect );

	if( nr != -1 )
	{
		//
		// Set scrollbar
		int nTopIdx = GetTopIndex();

		SCROLLINFO info;
		info.cbSize = sizeof(SCROLLINFO);
		if( m_pScroll->GetScrollInfo( &info, SIF_ALL|SIF_DISABLENOSCROLL ) )
		{
			info.nPos = nTopIdx;
			m_pScroll->SetScrollInfo( &info );
		}
	}
	return nr;
}

int CDropListBox::GetMaxVisibleItems()
{
	CRect rectClient;
	GetClientRect(&rectClient);
	int n = rectClient.Height() / GetItemHeight(0);
	return n;
}

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License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

About the Author

Geert van Horrik
Software Developer CatenaLogic
Netherlands Netherlands
I am Geert van Horrik, and I have studied Computer Science in the Netherlands.
 
I love to write software using .NET (especially the combination of WPF and C#). I am also the lead developer of Catel, an open-source application development framework for WPF, Silverlight, WP7 and WinRT with the focus on MVVM.
 
I have my own company since January 1st 2007, called CatenaLogic. This company develops commercial and non-commercial software.
 
To download (or buy) applications I have written, visit my website: http://www.catenalogic.com
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Web02 | 2.8.140721.1 | Last Updated 17 Jan 2008
Article Copyright 2008 by Geert van Horrik
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