403 lines
12 KiB
C++
403 lines
12 KiB
C++
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/***************************************************************************/
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/** Microsoft Windows **/
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/** Copyright(c) Microsoft Corp., 1993 **/
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/***************************************************************************/
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/****************************************************************************
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ICONLBOX.C
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Implementation for IconListBox class
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May 93, JimH
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See ICONLBOX.H for details on use.
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****************************************************************************/
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#include "npcommon.h"
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#include <windows.h>
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#include <memory.h>
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#include <iconlbox.h>
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#if defined(DEBUG)
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static const char szFileName[] = __FILE__;
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#define _FILENAME_DEFINED_ONCE szFileName
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#endif
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#include <npassert.h>
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/****************************************************************************
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IconListBox constructor
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Some initialization is done here, and some is done in SetHeight
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(when window handles are known.)
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****************************************************************************/
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IconListBox::IconListBox(HINSTANCE hInst, int nCtlID,
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int iconWidth, int iconHeight) :
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_nCtlID(nCtlID), _hInst(hInst),
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_iconWidth(iconWidth), _iconHeight(iconHeight),
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_hbrSelected(NULL), _hbrUnselected(NULL),
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_fCombo(FALSE), _cIcons(0), _cTabs(0),_iCurrentMaxHorzExt(0),
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_hwndDialog(NULL), _hwndListBox(NULL)
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{
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_colSel = ::GetSysColor(COLOR_HIGHLIGHT);
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_colSelText = ::GetSysColor(COLOR_HIGHLIGHTTEXT);
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_colUnsel = ::GetSysColor(COLOR_WINDOW);
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_colUnselText = ::GetSysColor(COLOR_WINDOWTEXT);
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}
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/****************************************************************************
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IconListBox destructor
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deletes any GDI objects created by IconListBox
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****************************************************************************/
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IconListBox::~IconListBox()
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{
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for (int i = 0; i < _cIcons; i++)
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{
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if (_aIcons[i].hbmSelected)
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{
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if (_aIcons[i].hbmSelected)
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{
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::DeleteObject(_aIcons[i].hbmSelected);
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::DeleteObject(_aIcons[i].hbmUnselected);
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}
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// Subsequent _aIcons may have used the same bitmap.
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// Mark those as already deleted.
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for (int j = i + 1; j < _cIcons; j++)
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{
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if (_aIcons[j].nResID == _aIcons[i].nResID)
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{
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_aIcons[j].hbmSelected = NULL;
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_aIcons[j].hbmUnselected = NULL;
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}
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}
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}
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}
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if (_hbrSelected)
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::DeleteObject(_hbrSelected);
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if (_hbrUnselected)
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::DeleteObject(_hbrUnselected);
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}
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/****************************************************************************
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IconListBox::SetHeight
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This function MUST be called in reponse to the WM_MEASUREITEM message.
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It creates some GDI objects, and initializes class variables not known
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at construction time.
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****************************************************************************/
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void IconListBox::SetHeight(HWND hwndDlg,
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LPMEASUREITEMSTRUCT lpm,
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int itemHeight) // defaults to 16
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{
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ASSERT(hwndDlg != NULL);
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ASSERT((int)lpm->CtlID == _nCtlID);
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_hwndDialog = hwndDlg;
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_hwndListBox = ::GetDlgItem(_hwndDialog, _nCtlID);
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// Determine if this is a combo box
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char szClass[32];
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GetClassName(_hwndListBox,szClass,sizeof(szClass));
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if (::lstrcmpi(szClass,"combobox") == 0 )
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_fCombo = TRUE;
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// Create the background brushes used for filling listbox entries...
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_hbrSelected = ::CreateSolidBrush(_colSel);
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_hbrUnselected = ::CreateSolidBrush(_colUnsel);
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// Calculate how to centre the text vertically in the listbox item.
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TEXTMETRIC tm;
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HDC hDC = ::GetDC(hwndDlg);
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GetTextMetrics(hDC, &tm);
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// Set the only lpm entry that matters
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// allow larger height if passed in - but at least large enough
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// to fit font.
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lpm->itemHeight = max( itemHeight, tm.tmHeight + tm.tmExternalLeading );
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_nTextOffset = tm.tmExternalLeading / 2 + 1;
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::ReleaseDC(hwndDlg, hDC);
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}
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/****************************************************************************
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IconListBox::DrawItem
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This function MUST be called in response to the WM_DRAWITEM message.
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It takes care of drawing listbox items in selected or unselected state.
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Drawing and undrawing the focus rectangle takes advantage of the fact
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that DrawFocusRect uses an XOR pen, and Windows is nice enough to assume
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this in the order of the ODA_FOCUS messages.
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****************************************************************************/
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void IconListBox::DrawItem(LPDRAWITEMSTRUCT lpd)
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{
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ASSERT(_hwndDialog != NULL); // make sure SetHeight has been called
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char string[MAXSTRINGLEN];
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BOOL bSelected = (lpd->itemState & ODS_SELECTED);
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GetString(lpd->itemID, string);
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// fill entire rectangle with background color
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::FillRect(lpd->hDC, &(lpd->rcItem),
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bSelected ? _hbrSelected : _hbrUnselected);
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// Look for registered icon to display, and paint it if found
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for (int id = 0; id < _cIcons; id++)
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if (_aIcons[id].nID == (int) lpd->itemData)
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break;
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if (id != _cIcons) // if we found a bitmap to display
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{
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HDC hdcMem = ::CreateCompatibleDC(lpd->hDC);
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HBITMAP hOldBitmap = (HBITMAP)::SelectObject(hdcMem,
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bSelected ? _aIcons[id].hbmSelected : _aIcons[id].hbmUnselected);
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// draw bitmap ICONSPACE pixels from left and centred vertically
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int x = lpd->rcItem.left + ICONSPACE;
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int y = ((lpd->rcItem.bottom - lpd->rcItem.top) - _iconHeight) / 2;
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y += lpd->rcItem.top;
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::BitBlt(lpd->hDC, x, y, _iconWidth, _iconHeight, hdcMem,
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_aIcons[id].x, _aIcons[id].y, SRCCOPY);
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::SelectObject(hdcMem, hOldBitmap);
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::DeleteDC(hdcMem);
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}
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if (lpd->itemState & ODS_FOCUS)
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::DrawFocusRect(lpd->hDC, &(lpd->rcItem));
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lpd->rcItem.left += (_iconWidth + (2 * ICONSPACE));
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// Paint string
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::SetTextColor(lpd->hDC, bSelected ? _colSelText : _colUnselText);
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::SetBkColor(lpd->hDC, bSelected ? _colSel : _colUnsel);
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(lpd->rcItem.top) += _nTextOffset;
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if (_cTabs == 0) // if no tabs registered
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{
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::DrawText(lpd->hDC, string, lstrlen(string), &(lpd->rcItem),
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DT_LEFT | DT_EXPANDTABS);
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}
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else
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{
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::TabbedTextOut(lpd->hDC, lpd->rcItem.left, lpd->rcItem.top,
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string, lstrlen(string), _cTabs, _aTabs, 0);
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}
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}
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/****************************************************************************
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IconListBox::RegisterIcons
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Icons must be registered before they can be referenced in AddString.
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Note that if you are using several icons from the same bitmap (with different
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x and y offsets) they must all have the same background color.
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****************************************************************************/
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void IconListBox::RegisterIcon( int nIconID, // caller's code
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int nResID, // RC file id
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int x, int y, // top left corner
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COLORREF colTransparent) // def. bright green
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{
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ASSERT( _cIcons < MAXICONS );
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_aIcons[_cIcons].nID = nIconID;
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_aIcons[_cIcons].nResID = nResID;
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_aIcons[_cIcons].x = x;
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_aIcons[_cIcons].y = y;
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// Check to see if we already have bitmaps for this resource ID
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// (which may have different x and y offsets.)
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for (int i = 0; i < _cIcons; i++)
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{
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if (_aIcons[i].nResID == nResID)
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{
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_aIcons[_cIcons].hbmSelected = _aIcons[i].hbmSelected;
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_aIcons[_cIcons].hbmUnselected = _aIcons[i].hbmUnselected;
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_cIcons++;
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return;
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}
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}
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// Otherwise, create new selected and unselected bitmaps
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// Get pointer to DIB
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HRSRC h = ::FindResource(_hInst, MAKEINTRESOURCE(nResID), RT_BITMAP);
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if (h == NULL)
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return;
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HANDLE hRes = ::LoadResource(_hInst, h);
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if (hRes == NULL)
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return;
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LPBITMAPINFOHEADER lpInfo = (LPBITMAPINFOHEADER) LockResource(hRes);
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if (NULL == lpInfo)
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return;
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// Get pointers to start of color table, and start of actual bitmap bits
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// Note that we make a copy of the bitmap header info and the color
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// table. This is so applications that use iconlistbox can keep their
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// resource segments read only.
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LPBYTE lpBits = (LPBYTE)
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(lpInfo + 1) + (1 << (lpInfo->biBitCount)) * sizeof(RGBQUAD);
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int cbCopy = (int) (lpBits - (LPBYTE)lpInfo);
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BYTE *lpCopy = new BYTE[cbCopy];
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if (!lpCopy)
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return;
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memcpy(lpCopy, lpInfo, cbCopy);
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RGBQUAD FAR *lpRGBQ =
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(RGBQUAD FAR *) ((LPSTR)lpCopy + lpInfo->biSize);
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// Find transparent color in color table
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BOOL bFound = FALSE; // did we find a transparent match?
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int nColorTableSize = (int) (lpBits - (LPBYTE)lpRGBQ);
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nColorTableSize /= sizeof(RGBQUAD);
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for (i = 0; i < nColorTableSize; i++)
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{
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if (colTransparent ==
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RGB(lpRGBQ[i].rgbRed, lpRGBQ[i].rgbGreen, lpRGBQ[i].rgbBlue))
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{
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bFound = TRUE;
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break;
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}
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}
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// Replace the transparent color with the background for selected and
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// unselected entries. Use these to create selected and unselected
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// bitmaps, and restore color table.
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RGBQUAD rgbqTemp; // color table entry to replace
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HDC hDC = ::GetDC(_hwndDialog);
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if (bFound)
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{
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rgbqTemp = lpRGBQ[i];
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lpRGBQ[i].rgbRed = GetRValue(_colUnsel);
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lpRGBQ[i].rgbBlue = GetBValue(_colUnsel);
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lpRGBQ[i].rgbGreen = GetGValue(_colUnsel);
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}
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_aIcons[_cIcons].hbmUnselected = ::CreateDIBitmap(hDC,
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(LPBITMAPINFOHEADER)lpCopy, CBM_INIT, lpBits,
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(LPBITMAPINFO)lpCopy, DIB_RGB_COLORS);
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if (bFound)
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{
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lpRGBQ[i].rgbRed = GetRValue(_colSel);
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lpRGBQ[i].rgbBlue = GetBValue(_colSel);
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lpRGBQ[i].rgbGreen = GetGValue(_colSel);
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}
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_aIcons[_cIcons].hbmSelected = ::CreateDIBitmap(hDC,
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(LPBITMAPINFOHEADER)lpCopy, CBM_INIT, lpBits,
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(LPBITMAPINFO)lpCopy, DIB_RGB_COLORS);
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if (bFound)
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lpRGBQ[i] = rgbqTemp; // restore original color table entry
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::ReleaseDC(_hwndDialog, hDC);
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::FreeResource(hRes);
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delete [] lpCopy;
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_cIcons++;
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}
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/****************************************************************************
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IconListBox::SetTabStops
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Since this is an owner-draw listbox, we can't rely on LB_SETTABS.
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Instead, tabs are registered here and TabbedTextOut is used to display
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strings. Dialogbox units have to be converted to pixels.
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****************************************************************************/
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void IconListBox::SetTabStops(int cTabs, const int *pTabs)
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{
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ASSERT(cTabs <= MAXTABS);
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int nSize = (int) LOWORD(GetDialogBaseUnits());
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for (int i = 0; i < cTabs; i++)
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_aTabs[i] = ((nSize * pTabs[i]) / 4);
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_cTabs = cTabs;
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}
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/****************************************************************************
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IconListBox::UpdateHorizontalExtent
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****************************************************************************/
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int IconListBox::UpdateHorizontalExtent(int nIcon,const char *string)
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{
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ASSERT(_hwndDialog != NULL); // make sure SetHeight has been called
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if (!string)
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return 0;
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// Calculate width in pixels for given string, taking into account icon, spacing and tabs
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int iItemWidth = ICONSPACE + (_iconWidth + (2 * ICONSPACE));
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HDC hDC = ::GetDC(_hwndDialog);
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iItemWidth += LOWORD(GetTabbedTextExtent(hDC,string,::lstrlen(string),_cTabs, _aTabs));
|
||
|
|
::ReleaseDC(_hwndDialog, hDC);
|
||
|
|
|
||
|
|
// Update maximum value
|
||
|
|
_iCurrentMaxHorzExt = max(_iCurrentMaxHorzExt,iItemWidth);
|
||
|
|
|
||
|
|
return (int)SendDlgItemMessage(_hwndDialog,_nCtlID,
|
||
|
|
LB_SETHORIZONTALEXTENT,
|
||
|
|
(WPARAM)_iCurrentMaxHorzExt,0L);
|
||
|
|
|
||
|
|
}
|