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OWNCOMBO.C
资源名称：MSDN_VC98.zip [点击查看]
上传用户：bangxh
上传日期：2007-01-31
资源大小：42235k
文件大小：36k
源码类别：
Windows编程
开发平台：
Visual C++
- /******************************************************************************
- * This is a part of the Microsoft Source Code Samples.
- * Copyright (C) 1993 - 1997 Microsoft Corp.
- * All rights reserved.
- * This source code is only intended as a supplement to
- * Microsoft Development Tools and/or WinHelp documentation.
- * See these sources for detailed information regarding the
- * Microsoft samples programs.
- ******************************************************************************/
- /***************************************************************************
- * *
- * PROGRAM : OwnCombo.c *
- * *
- * PURPOSE : Illustrates the use of functions and messages for *
- * combo boxes and owner-draw control styles. *
- * *
- * FUNCTIONS : WinMain - Creates the app. window and *
- * enters the message loop. *
- * *
- * OwnComboInit - Registers the main window class *
- * *
- * About - Dialog function for the About *
- * dialog. *
- * *
- * OwnComboWndProc - Window function for app. It *
- * handles the menu selections *
- * and processes the other window *
- * messages. *
- * *
- * DrawEntireItem - Handles the drawing of a list *
- * list box or combo box item. *
- * *
- * HandleSelectionState - Handles the selecting/deselect- *
- * ing of a list box or combo box *
- * item. *
- * *
- * HandleFocusState - Handles the getting/losing of *
- * the input focus by a list box *
- * *
- * ListBoxExample - Dialog function for the *
- * owner-draw list box example. *
- * *
- * ComboBoxExample - Dialog function for the text *
- * combo dialog. *
- * *
- * OwnerComboBoxExample - Dialog fubction for the drop- *
- * down-list combobox with *
- * ownerdraw. *
- * *
- ***************************************************************************/
- #include "windows.h"
- #include "owncombo.h"
- HANDLE hInst;
- /****************************************************************************
- * *
- * FUNCTION : WinMain(HANDLE, HANDLE, LPSTR, int) *
- * *
- * PURPOSE : Creates the app. window and enters the message loop. *
- * *
- ****************************************************************************/
- int APIENTRY WinMain(
- HINSTANCE hInstance,
- HINSTANCE hPrevInstance,
- LPSTR lpCmdLine,
- int nCmdShow
- )
- {
- HWND hWnd;
- MSG msg;
- UNREFERENCED_PARAMETER( lpCmdLine );
- if (!hPrevInstance)
- if (!OwnComboInit (hInstance))
- return (0);
- hInst = hInstance;
- /* Create the app. window */
- hWnd = CreateWindow ("owncombo",
- "Owner-draw & Combo Box Example",
- WS_OVERLAPPEDWINDOW,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- CW_USEDEFAULT,
- (HWND) NULL,
- NULL,
- hInstance,
- (LPSTR) NULL);
- if (!hWnd)
- return (0);
- ShowWindow (hWnd, nCmdShow);
- while (GetMessage (&msg, NULL, 0, 0)){
- TranslateMessage (&msg);
- DispatchMessage (&msg);
- }
- return(msg.wParam);
- }
- /****************************************************************************
- * *
- * FUNCTION : OwnComboInit (hInstance) *
- * *
- * PURPOSE : Registers the main window class. *
- * *
- * RETURNS : TRUE - if RegisterClass () succeeds. *
- * FALSE - if RegisterClass () fails. *
- * *
- ****************************************************************************/
- BOOL NEAR PASCAL OwnComboInit (HANDLE hInstance)
- {
- HANDLE hMemory;
- PWNDCLASS pWndClass;
- BOOL bSuccess;
- /* Allocate for and fill class structure. */
- hMemory = LocalAlloc (LPTR, sizeof (WNDCLASS));
- if(!hMemory){
- MessageBox(NULL, "<OwnComboInit> Not enough memory.", NULL, MB_OK | MB_ICONHAND);
- return(FALSE);
- }
- pWndClass = (PWNDCLASS) LocalLock (hMemory);
- pWndClass->style = 0;
- pWndClass->lpfnWndProc = (WNDPROC) OwnComboWndProc;
- pWndClass->hInstance = hInstance;
- pWndClass->hIcon = LoadIcon (hInstance, "owncombo");
- pWndClass->hCursor = LoadCursor (NULL, IDC_ARROW);
- pWndClass->hbrBackground = GetStockObject (WHITE_BRUSH);
- pWndClass->lpszMenuName = (LPSTR) "OwnComboMenu",
- pWndClass->lpszClassName = (LPSTR) "owncombo";
- bSuccess = RegisterClass (pWndClass);
- LocalUnlock (hMemory);
- LocalFree (hMemory);
- return (bSuccess);
- }
- /****************************************************************************
- * *
- * FUNCTION : About (hDlg,message, wParam, lParam) *
- * *
- * PURPOSE : Dialog function for the About... dialog. *
- * *
- ****************************************************************************/
- BOOL APIENTRY About (
- HWND hDlg,
- UINT message,
- UINT wParam,
- LONG lParam)
- {
- UNREFERENCED_PARAMETER(lParam);
- switch (message){
- case WM_INITDIALOG:
- return(TRUE);
- case WM_COMMAND:
- if (LOWORD(wParam) == IDOK){
- EndDialog (hDlg,0);
- return(FALSE);
- }
- break;
- default:
- break;
- }
- return(FALSE);
- }
- /****************************************************************************
- * *
- * FUNCTION : OwnComboWndProc(hWnd, message, wParam, lParam) *
- * *
- * PURPOSE : Window function for the app. It handles menu selections *
- * and processes window WM_ messages. *
- * *
- ****************************************************************************/
- LONG APIENTRY OwnComboWndProc (
- HWND hWnd,
- UINT message,
- UINT wParam,
- LONG lParam)
- {
- switch (message){
- case WM_COMMAND:
- switch (LOWORD(wParam)){
- case IDM_EXIT:
- DestroyWindow (hWnd);
- break;
- case IDM_ABOUT:
- /* Bring up the about box */
- DialogBox (hInst,
- "AboutBox",
- hWnd,
- About);
- break;
- case IDM_LISTBOX:
- /* Bring up the list box example */
- DialogBox (hInst,
- "ListBoxDialog",
- hWnd,
- About);
- break;
- case IDM_MULTILISTBOX:
- /* Bring up the multiple selection list box example */
- DialogBox (hInst,
- "MultiListBoxDialog",
- hWnd,
- About);
- break;
- case IDM_COMBOBOX:
- /* Bring up the combo box example */
- DialogBox (hInst,
- "ComboBoxDialog",
- hWnd,
- About);
- break;
- case IDM_OWNERCOMBOBOX:
- /* Bring up the owner-draw dropdown list box example */
- DialogBox (hInst,
- "OwnerComboBoxDialog",
- hWnd,
- About);
- break;
- }
- break;
- case WM_DESTROY:
- PostQuitMessage (0);
- break;
- default:
- return(DefWindowProc(hWnd, message, wParam, lParam));
- }
- return(0);
- }
- /****************************************************************************
- * *
- * FUNCTION : HandleSelectionState(LPDRAWITEMSTRUCT, int) *
- * *
- * PURPOSE : Handles a change in an item selection state. If an item is *
- * selected, a black rectangular frame is drawn around that *
- * item; if an item is de-selected, the frame is removed. *
- * *
- * COMMENT : The black selection frame is slightly larger than the gray *
- * focus frame so they won't paint over each other. *
- * *
- ****************************************************************************/
- VOID APIENTRY HandleSelectionState(
- LPDRAWITEMSTRUCT lpdis,
- INT inflate)
- {
- RECT rc;
- HBRUSH hbr;
- /* Resize rectangle to place selection frame outside of the focus
- * frame and the item.
- */
- CopyRect ((LPRECT)&rc, (LPRECT)&lpdis->rcItem);
- InflateRect ((LPRECT)&rc, inflate, inflate);
- if (lpdis->itemState & ODS_SELECTED)
- {
- /* selecting item -- paint a black frame */
- hbr = GetStockObject(BLACK_BRUSH);
- }
- else
- {
- /* de-selecting item -- remove frame */
- hbr = CreateSolidBrush(GetSysColor(COLOR_WINDOW));
- }
- FrameRect(lpdis->hDC, (LPRECT)&rc, hbr);
- DeleteObject (hbr);
- }
- /****************************************************************************
- * *
- * FUNCTION : HandleFocusState(LPDRAWITEMSTRUCT, int) *
- * *
- * PURPOSE : Handle a change in item focus state. If an item gains the *
- * input focus, a gray rectangular frame is drawn around that *
- * item; if an item loses the input focus, the gray frame is *
- * removed. *
- * *
- * COMMENT : The gray focus frame is slightly smaller than the black *
- * selection frame so they won't paint over each other. *
- * *
- ****************************************************************************/
- VOID APIENTRY HandleFocusState(
- LPDRAWITEMSTRUCT lpdis,
- INT inflate)
- {
- RECT rc;
- HBRUSH hbr;
- /* Resize rectangle to place focus frame between the selection
- * frame and the item.
- */
- CopyRect ((LPRECT)&rc, (LPRECT)&lpdis->rcItem);
- InflateRect ((LPRECT)&rc, inflate, inflate);
- if (lpdis->itemState & ODS_FOCUS)
- {
- /* gaining input focus -- paint a gray frame */
- hbr = GetStockObject(GRAY_BRUSH);
- }
- else
- {
- /* losing input focus -- remove (paint over) frame */
- hbr = CreateSolidBrush(GetSysColor(COLOR_WINDOW));
- }
- FrameRect(lpdis->hDC, (LPRECT)&rc, hbr);
- DeleteObject (hbr);
- }
- /****************************************************************************
- * *
- * FUNCTION : DrawEntireItem(LPDRAWITEMSTRUCT, int) *
- * *
- * PURPOSE : Draws an item and frames it with a selection frame and/or *
- * a focus frame when appropriate. *
- * *
- ****************************************************************************/
- VOID APIENTRY DrawEntireItem(
- LPDRAWITEMSTRUCT lpdis,
- INT inflate)
- {
- RECT rc;
- HBRUSH hbr;
- /* Resize rectangle to leave space for frames */
- CopyRect ((LPRECT)&rc, (LPRECT)&lpdis->rcItem);
- InflateRect ((LPRECT)&rc, inflate, inflate);
- /* Create a brush using the value in the item data field (this value
- * was initialized when we added the item to the list/combo box using
- * LB_ADDSTRING/CB_ADDSTRING) and draw the color in the list/combo box.
- */
- hbr = CreateSolidBrush (lpdis->itemData);
- FillRect (lpdis->hDC, (LPRECT)&rc, hbr);
- DeleteObject (hbr);
- /* Draw or erase appropriate frames */
- HandleSelectionState(lpdis, inflate + 4);
- HandleFocusState(lpdis, inflate + 2);
- }
- /****************************************************************************
- * *
- * FUNCTION : ListBoxExample (hDlg, message, wParam, lParam) *
- * *
- * PURPOSE : Dialog function for the owner-draw list box example. *
- * It sets up the example dialog with the owner-draw list box,*
- * adds the colors to the list box, and handles setting the *
- * selection and focus for the items. *
- * *
- ****************************************************************************/
- BOOL APIENTRY ListBoxExample (
- HWND hDlg,
- UINT message,
- UINT wParam,
- LONG lParam)
- {
- LPDRAWITEMSTRUCT lpdis;
- LPMEASUREITEMSTRUCT lpmis;
- /* Vars for WM_DRAWITEM */
- switch (message){
- case WM_COMMAND:
- switch (LOWORD(wParam)){
- case IDOK:
- EndDialog (hDlg, 0);
- return (TRUE);
- break;
- /* Clicking any of these buttons adds the corresponding color
- * to the list box. The application-supplied data is the RGB
- * value for the color to be drawn in the listbox.
- */
- case ID_BLACK:
- SendMessage (GetDlgItem (hDlg, ID_LISTBOX),
- LB_ADDSTRING,
- 0,
- RGB (0,0,0));
- return(TRUE);
- break;
- case ID_RED:
- SendMessage (GetDlgItem (hDlg, ID_LISTBOX),
- LB_ADDSTRING,
- 0,
- RGB (255,0,0));
- return(TRUE);
- break;
- case ID_BLUE:
- SendMessage (GetDlgItem (hDlg, ID_LISTBOX),
- LB_ADDSTRING,
- 0,
- RGB (0,0,255));
- return(TRUE);
- break;
- case ID_GREEN:
- SendMessage (GetDlgItem (hDlg, ID_LISTBOX),
- LB_ADDSTRING,
- 0,
- RGB (0,255,0));
- return(TRUE);
- break;
- default:
- return(FALSE);
- break;
- }
- case WM_DRAWITEM:
- /* Get pointer to the DRAWITEMSTRUCT */
- lpdis = (LPDRAWITEMSTRUCT)lParam;
- if (lpdis->itemID == -1)
- {
- /* We have a request to draw an item in the list box, yet there
- * are no list box items. This is sent when the user TABS into
- * an empty list box or an empty list box gets the focus. We
- * have to indicate (somehow) that this owner-draw list box has
- * the focus. We do it in response to this message. Note that
- * lpdis->itemData field would be invalid in this instance so
- * we can't allow it to fall into our standard routines.
- */
- HandleFocusState(lpdis, -5);
- }
- else
- {
- switch (lpdis->itemAction)
- {
- case ODA_DRAWENTIRE:
- DrawEntireItem(lpdis, -7);
- break;
- case ODA_SELECT:
- HandleSelectionState(lpdis, -3);
- break;
- case ODA_FOCUS:
- HandleFocusState(lpdis, -5);
- break;
- }
- }
- /* Return TRUE meaning that we processed this message. */
- return(TRUE);
- break;
- case WM_MEASUREITEM:
- lpmis = (LPMEASUREITEMSTRUCT)lParam;
- /* All the items are the same height since the list box style is
- * LBS_OWNERDRAWFIXED
- */
- lpmis->itemHeight = 30;
- break;
- case WM_CLOSE:
- EndDialog(hDlg, 0);
- return(TRUE);
- break;
- default:
- return(FALSE);
- }
- return(TRUE);
- }
- /****************************************************************************
- * *
- * FUNCTION : ComboBoxExample(hWnd, message, wParam, lParam) *
- * *
- * PURPOSE : Dialog function for the text combo dialog. The push buttons*
- * send various messages to the combo box and the edit control*
- * when selected. They allow the user to vary data sent with *
- * each message. *
- * *
- ****************************************************************************/
- BOOL APIENTRY ComboBoxExample(
- HWND hDlg,
- UINT message,
- UINT wParam,
- LONG lParam)
- {
- HWND hWndCombo; /* Handle to the combo box control */
- /* in the dialog box window */
- HWND hWndCheckBox; /* Handle to the Auto Check Box */
- CHAR strSingleEditLine[255]; /* Single line edit control input */
- INT wIndex, wCount;
- /* Get handles to the Combo box and the Check box */
- hWndCombo = GetDlgItem(hDlg, ID_COMBOBOX);
- hWndCheckBox = GetDlgItem(hDlg, ID_STEPSBOX);
- switch (message){
- case WM_COMMAND:
- switch (LOWORD(wParam)){
- case IDOK:
- EndDialog (hDlg,0);
- return(TRUE);
- case ID_UNSLBUTTON:
- /* Selecting this button unselects any selection in the
- * combo box.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- wIndex = (WORD) SendMessage( hWndCombo, CB_GETCURSEL, 0, 0L);
- if (wIndex == CB_ERR)
- MessageBox (hDlg, (LPSTR)"No Selection", NULL, MB_OK);
- else
- SendMessage (hWndCombo, CB_SETCURSEL, (WPARAM)-1, 0L);
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_NUMSELBUTTON:
- /* An integer value is taken from the edit control and an
- * attempt is made to select a combo box entry having this
- * index.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- wCount = (WORD) SendMessage (hWndCombo, CB_GETCOUNT, 0, 0L);
- wIndex = (INT) GetDlgItemInt (hDlg, ID_SINGLEEDIT, NULL, TRUE);
- if (wIndex >= wCount)
- MessageBox (hDlg, (LPSTR)"Bad Selection", NULL, MB_OK);
- else
- SendMessage(hWndCombo, CB_SETCURSEL, wIndex, 0L);
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_TXTSELBUTTON:
- /* A text string is taken from the edit control and an
- * attempt is made to select a combo box entry having the
- * string as a prefix.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- GetDlgItemText (hDlg, ID_SINGLEEDIT,
- (LPSTR)strSingleEditLine, 255);
- wIndex = (WORD) SendMessage (hWndCombo,
- CB_SELECTSTRING,
- (WPARAM)-1,
- (LONG)(LPSTR)strSingleEditLine);
- if (wIndex == CB_ERR)
- MessageBox (hDlg, (LPSTR)"Bad Selection", NULL, MB_OK);
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_FNDSELBUTTON:
- /* Searches for the text specified in the list of combo
- * entries and returns the index (in combo box) of the
- * first match. The index is displayed in the "Text1"
- * field of the dialog.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- GetDlgItemText (hDlg,
- ID_SINGLEEDIT,
- (LPSTR)strSingleEditLine,
- 255);
- wIndex = (WORD)SendMessage (hWndCombo,
- CB_FINDSTRING,(WPARAM)-1,
- (LONG)(LPSTR)strSingleEditLine);
- if (wIndex == CB_ERR)
- MessageBox (hDlg, (LPSTR)"Bad Selection", NULL, MB_OK);
- else
- SetDlgItemInt (hDlg, ID_TEXT1, wIndex, FALSE);
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_CLRBUTTON:
- /* Clears the combo box of all it's entries */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- wCount = (WORD) SendMessage (hWndCombo, CB_GETCOUNT, 0, 0L);
- if (!wCount)
- MessageBox (hDlg, (LPSTR)"Already clear", NULL, MB_OK);
- else{
- SetDlgItemInt (hDlg, ID_TEXT1, wCount, TRUE);
- SetDlgItemText (hDlg, ID_TEXT2, "Items cleared");
- SendMessage (hWndCombo,CB_RESETCONTENT, 0, 0L);
- }
- SetFocus (GetDlgItem (hDlg,ID_SINGLEEDIT));
- break;
- case ID_ADDBUTTON:
- /* Takes the string specified in the edit control and
- * adds it to the combo box.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- GetDlgItemText (hDlg, ID_SINGLEEDIT, strSingleEditLine, 255);
- SendMessage (hWndCombo,
- CB_ADDSTRING,
- 0,
- (LONG)(LPSTR) strSingleEditLine);
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_DELETEBUTTON:
- /* Delete the currently selected item from the combo box. */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- wIndex = (WORD) SendMessage (hWndCombo, CB_GETCURSEL, 0, 0L);
- if (SendMessage (hWndCombo, CB_DELETESTRING, wIndex, 0L) == CB_ERR)
- MessageBox (hDlg, (LPSTR)"No Selection", NULL, MB_OK);
- else{
- SetDlgItemText (hDlg, ID_TEXT1, "deleted index #");
- SetDlgItemInt (hDlg, ID_TEXT2, wIndex, TRUE);
- }
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_CBDIRBUTTON:
- /* Appends a directory listing of the current directory
- * to the combo box entries.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- wIndex = (WORD)SendMessage (hWndCombo,
- CB_DIR,
- 0x10|0x4000,
- (LONG)(LPSTR)"*.*");
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- case ID_CPYBUTTON:
- /* Copies the currently selected item in the combo box to
- * the edit control.
- */
- SetDlgItemText (hDlg, ID_TEXT1, "");
- SetDlgItemText (hDlg, ID_TEXT2, "");
- wIndex = (WORD) SendMessage (hWndCombo, CB_GETCURSEL, 0, 0L);
- if (wIndex == CB_ERR)
- MessageBox(hDlg, (LPSTR)"No Selection", NULL, MB_OK);
- else{
- wCount = SendMessage (hWndCombo, CB_GETLBTEXTLEN, wIndex, 0L);
- SendMessage (hWndCombo,
- CB_GETLBTEXT,
- wIndex,
- (LONG)(LPSTR)strSingleEditLine);
- SetDlgItemText(hDlg, ID_SINGLEEDIT,
- (LPSTR)strSingleEditLine);
- SetDlgItemText(hDlg, ID_TEXT1, "copied index #");
- SetDlgItemInt(hDlg, ID_TEXT2, wIndex, TRUE);
- }
- SetFocus (GetDlgItem (hDlg, ID_SINGLEEDIT));
- break;
- /* When the combo notification box is checked, a message box
- * is flashed showing what notification codes the combo box is
- * returning to the app. in response to the messages sent by
- * the buttons.
- */
- case ID_COMBOBOX:
- if (SendMessage (hWndCheckBox, BM_GETCHECK, 0, 0L)){
- switch (HIWORD(lParam)){
- case (WORD)CBN_ERRSPACE:
- MessageBox (hDlg, (LPSTR)"CB Out of Space",
- "CB MSG", MB_OK);
- break;
- case CBN_SELCHANGE:
- MessageBox (hDlg, (LPSTR)"CB Sel Change",
- "CB MSG", MB_OK);
- break;
- case CBN_DBLCLK:
- MessageBox(hDlg, (LPSTR)"CB Double Click",
- "CB MSG", MB_OK);
- break;
- case CBN_SETFOCUS:
- SetDlgItemText(hDlg, ID_TEXT1, "CB SetFocus");
- break;
- case CBN_KILLFOCUS:
- SetDlgItemText(hDlg, ID_TEXT1, "CB KillFocus");
- break;
- }
- }
- break;
- default:
- return(FALSE);
- }
- break;
- case WM_CLOSE:
- EndDialog(hDlg, 0);
- return(TRUE);
- break;
- default:
- return(FALSE);
- }
- return(TRUE);
- }
- /****************************************************************************
- * *
- * FUNCTION : OwnerComboBoxExample(hWnd, message, wParam, lParam) *
- * *
- * PURPOSE : Dialog function for the dropdown list combo box with *
- * owner-draw. *
- * *
- ****************************************************************************/
- BOOL APIENTRY OwnerComboBoxExample (
- HWND hDlg,
- UINT message,
- UINT wParam,
- LONG lParam)
- {
- LPDRAWITEMSTRUCT lpdis;
- LPMEASUREITEMSTRUCT lpmis;
- switch (message){
- case WM_COMMAND:
- switch (LOWORD(wParam)){
- case IDOK:
- EndDialog (hDlg, 0);
- return(TRUE);
- break;
- /* Clicking any of these buttons adds the corresponding color
- * to the combo box. The application-supplied data is the RGB
- * value for the color to be drawn in the listbox.
- */
- case ID_BLACK:
- SendMessage (GetDlgItem(hDlg, ID_LISTBOX),
- CB_ADDSTRING,
- 0,
- RGB (0,0,0));
- return(TRUE);
- break;
- case ID_RED:
- SendMessage (GetDlgItem (hDlg, ID_LISTBOX),
- CB_ADDSTRING,
- 0,
- RGB (255,0,0));
- return(TRUE);
- break;
- case ID_BLUE:
- SendMessage (GetDlgItem(hDlg, ID_LISTBOX),
- CB_ADDSTRING,
- 0,
- RGB (0,0,255));
- return(TRUE);
- break;
- case ID_GREEN:
- SendMessage (GetDlgItem(hDlg, ID_LISTBOX),
- CB_ADDSTRING,
- 0,
- RGB (0,255,0));
- return(TRUE);
- break;
- default:
- return(TRUE);
- break;
- }
- case WM_DRAWITEM:
- /* Get pointer to the DRAWITEMSTRUCT */
- lpdis = (LPDRAWITEMSTRUCT)lParam;
- if (lpdis->itemID == -1){
- /* We have a request to draw an item in the combo box, yet there
- * are no combo box items. This is sent when the user TABS into
- * an empty combo box or an empty combo box gets the focus. We
- * have to indicate (somehow) that this owner-draw combo box has
- * the focus. We do it in response to this message. Note that
- * lpdis->itemData field would be invalid in this instance so
- * we can't allow it to fall into our standard routines.
- */
- HandleFocusState(lpdis, -2);
- }
- else
- {
- switch (lpdis->itemAction)
- {
- case ODA_DRAWENTIRE:
- DrawEntireItem(lpdis, -4);
- break;
- case ODA_SELECT:
- HandleSelectionState(lpdis, 0);
- break;
- case ODA_FOCUS:
- HandleFocusState(lpdis, -2);
- break;
- }
- }
- /* Return TRUE meaning that we processed this message. */
- return(TRUE);
- break;
- case WM_MEASUREITEM:
- lpmis = (LPMEASUREITEMSTRUCT)lParam;
- /* All the items are the same height since the combo box is
- * CBS_OWNERDRAWFIXED
- */
- if (lpmis->itemID == -1){
- /* If -1 for item, then we are setting the height of the
- * always visible static item part of the dropdown combo box.
- */
- lpmis->itemHeight = 25;
- return(TRUE);
- }
- lpmis->itemHeight = 30;
- break;
- case WM_CLOSE:
- EndDialog(hDlg, 0);
- return(TRUE);
- break;
- default:
- return(FALSE);
- }
- return(TRUE);
- }
