440 lines
12 KiB
C++
440 lines
12 KiB
C++
//****************************************************************************
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// File:
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//
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// HLB.CPP
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//
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// Purpose:
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//
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// Implementation file for class CHorzListBox.
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//
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// Functions:
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//
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// CHorzListBox::CHorzListBox Constructs a CHorzListBox
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// CHorzListBox::~CHorzListBox Destructor
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// CHorzListBox::LockHExtentUpdate Pauses automatic updating of the
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// horizontal scroll bar
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// CHorzListBox::UnlockHExtentUpdate Restores automatic updating of
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// the horizontal scroll bar
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// CHorzListBox::UpdateHExtent Updates the horizontal scroll bar
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// extent after LockHExtentUpdate has
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// been called
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// CHorzListBox::InsertNewExtent Internal utility function used to
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// maintain the extent array
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// CHorzListBox::InitTabStops Internal tab stop init function
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// CHorzListBox::OnAddString Intercepts LB_ADDSTRING msg
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// CHorzListBox::OnInsertString Intercepts LB_INSERTSTRING msg
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// CHorzListBox::OnDeleteString Intercepts LB_DELETESTRING msg
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// CHorzListBox::OnSetTabStops Intercepts LB_SETTABSTOPS msg
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//
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// Development Team:
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//
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// James Rhodes
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//
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// Written by Microsoft Product Support Services, Languages Developer Support
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// Copyright (c) 1996-2001 Microsoft Corporation, All Rights Reserved
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//****************************************************************************
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#include "precomp.h"
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#include "HLB.h"
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#ifdef _DEBUG
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#define new DEBUG_NEW
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#undef THIS_FILE
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static char THIS_FILE[] = __FILE__;
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#endif
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/////////////////////////////////////////////////////////////////////////////
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// CHorzListBox
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::CHorzListBox()
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//
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// Purpose:
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//
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// Constructs a CHorzListBox object
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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CHorzListBox::CHorzListBox()
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{
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m_bLocked = FALSE; // start out in auto mode
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m_nLongestExtent = 0; // tracks longest extent, initially 0
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m_nTabStops = 0; // no tab stops
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m_lpTabStops = NULL; // array of tab stops
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::~CHorzListBox()
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//
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// Purpose:
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//
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// Destructs a CHorzListBox object
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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CHorzListBox::~CHorzListBox()
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{
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if (m_lpTabStops != NULL)
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delete m_lpTabStops;
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::LockHExtentUpdate()
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//
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// Purpose:
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//
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// Stops auto updating of horizontal extent
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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void CHorzListBox::LockHExtentUpdate()
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{
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m_bLocked = TRUE;
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::UnlockHExtentUpdate()
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//
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// Purpose:
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//
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// Turns auto updating back on
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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void CHorzListBox::UnlockHExtentUpdate()
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{
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m_bLocked = FALSE;
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::UpdateHExtent()
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//
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// Purpose:
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//
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// Updates horizontal extent when auto updating has been turned off
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// for some period.
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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void CHorzListBox::UpdateHExtent()
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{
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m_arrExtents.RemoveAll();
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m_nLongestExtent = 0;
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int nCount = GetCount();
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CDC* pDC = GetDC();
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HFONT hFont = (HFONT)SendMessage(WM_GETFONT);
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CFont *pFont = CFont::FromHandle(hFont);
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ASSERT(pFont);
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CFont* pPrevFont = pDC->SelectObject(pFont);
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CString str;
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for(int i=0; i<nCount; i++)
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{
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GetText(i, str);
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InsertNewExtent(i, str, pDC);
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}
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SetHorizontalExtent(m_nLongestExtent);
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pDC->SelectObject(pPrevFont);
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ReleaseDC(pDC);
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::InsertNewExtent() PROTECTED
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//
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// Purpose:
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//
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// Used to update the extent array when a new item is added
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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void CHorzListBox::InsertNewExtent(int nItem, LPCTSTR lpszStr, CDC* pDC)
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{
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if (NULL == m_lpTabStops)
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InitTabStops();
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CSize newExtent;
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if (GetStyle() & LBS_USETABSTOPS)
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newExtent = pDC->GetTabbedTextExtent(lpszStr, _tcslen(lpszStr),
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m_nTabStops, m_lpTabStops);
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else
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newExtent = pDC->GetTextExtent(lpszStr, _tcslen(lpszStr));
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newExtent.cx += 6;
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m_arrExtents.InsertAt(nItem, newExtent.cx);
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if (newExtent.cx > m_nLongestExtent)
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{
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m_nLongestExtent = newExtent.cx;
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}
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}
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void CHorzListBox::InsertNewExtent(int nItem, LPCTSTR lpszStr)
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{
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if (m_bLocked)
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return;
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CDC* pDC = GetDC();
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HFONT hFont = (HFONT)SendMessage(WM_GETFONT);
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CFont *pFont = CFont::FromHandle(hFont);
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ASSERT(pFont);
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CFont* pPrevFont = pDC->SelectObject(pFont);
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InsertNewExtent(nItem, lpszStr, pDC);
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SetHorizontalExtent(m_nLongestExtent);
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pDC->SelectObject(pPrevFont);
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ReleaseDC(pDC);
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::InitTabStops() PROTECTED
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//
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// Purpose:
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//
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// Initializes tab stops
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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void CHorzListBox::InitTabStops()
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{
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int nDefault = 2;
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SetTabStops(1, &nDefault);
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}
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BEGIN_MESSAGE_MAP(CHorzListBox, CListBox)
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//{{AFX_MSG_MAP(CHorzListBox)
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//}}AFX_MSG_MAP
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ON_MESSAGE( LB_ADDSTRING, OnAddString )
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ON_MESSAGE( LB_INSERTSTRING, OnInsertString )
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ON_MESSAGE( LB_DELETESTRING, OnDeleteString )
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ON_MESSAGE( LB_SETTABSTOPS, OnSetTabStops )
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END_MESSAGE_MAP()
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/////////////////////////////////////////////////////////////////////////////
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// CHorzListBox message handlers
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::OnAddString()
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//
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// Purpose:
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//
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// Intercepts the LB_ADDSTRING message to update the horizontal extent
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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LRESULT CHorzListBox::OnAddString(WPARAM, LPARAM lParam)
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{
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LRESULT lResult = Default();
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if (LB_ERR == lResult || LB_ERRSPACE == lResult) // check for error first!
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return lResult;
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InsertNewExtent((long) lResult, (LPCTSTR)lParam);
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return lResult;
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::OnInsertString()
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//
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// Purpose:
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//
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// Intercepts the LB_INSERTSTRING message to update the horizontal extent
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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LRESULT CHorzListBox::OnInsertString(WPARAM, LPARAM lParam)
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{
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LRESULT lResult = Default();
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if (LB_ERR == lResult || LB_ERRSPACE == lResult) // check for error first!
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return lResult;
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InsertNewExtent((LONG)lResult, (LPCTSTR)lParam);
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return lResult;
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::OnDeleteString()
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//
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// Purpose:
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//
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// Intercepts the LB_DELETESTRING message to update the horizontal extent
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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LRESULT CHorzListBox::OnDeleteString(WPARAM wParam, LPARAM)
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{
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LRESULT lResult = Default();
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if (LB_ERR == lResult) // check for error first!
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return lResult;
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if (m_bLocked) // don't do anything if locked
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return lResult;
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int nExtent = m_arrExtents[wParam];
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m_arrExtents.RemoveAt(wParam);
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if (nExtent >= m_nLongestExtent)
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{
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m_nLongestExtent = 0;
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for(int i = 0; i<lResult; i++)
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{
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if (m_arrExtents[i] > m_nLongestExtent)
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m_nLongestExtent = m_arrExtents[i];
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}
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}
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SetHorizontalExtent(m_nLongestExtent);
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return lResult;
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}
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//***********************************************************************
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// Function:
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//
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// CHorzListBox::OnSetTabStops()
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//
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// Purpose:
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//
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// Intercepts the LB_SETTABSTOPS message to update tab stop array
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//
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// History:
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//
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// Date Comment Initials
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// ======== ================================================= ========
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// 1/31/96 Created JMR
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//***********************************************************************
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LRESULT CHorzListBox::OnSetTabStops(WPARAM wParam, LPARAM lParam)
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{
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LRESULT lResult = Default();
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if (!lResult)
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return lResult;
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m_nTabStops = (int) wParam;
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if (NULL != m_lpTabStops)
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{
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delete [] m_lpTabStops;
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m_lpTabStops = NULL;
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}
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if (m_nTabStops > 0)
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{
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m_lpTabStops = new int[m_nTabStops];
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memcpy(m_lpTabStops, (void*)lParam, m_nTabStops * sizeof(int));
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CDC* pDC = GetDC();
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HFONT hFont = (HFONT)SendMessage(WM_GETFONT);
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CFont *pFont = CFont::FromHandle(hFont);
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ASSERT(pFont);
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CFont* pPrevFont = pDC->SelectObject(pFont);
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CSize size;
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GetTextExtentPoint32(pDC->GetSafeHdc(),
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_T("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"),
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52, &size);
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pDC->SelectObject(pPrevFont);
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ReleaseDC(pDC);
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int aveCharWidth = (size.cx/26 +1)/2;
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for(int i=0; i<m_nTabStops; i++)
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m_lpTabStops[i] = (m_lpTabStops[i] * aveCharWidth + 2)/4;
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}
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if (!m_bLocked)
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UpdateHExtent(); // tabs changed, recalc everything!
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return lResult;
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}
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