scrolldlg.c

Programming Windows CE Windows CE程序设计书籍源代码

//======================================================================
// ScrollDlg - Scroll bar dialog box window code
//
// Written for the book Programming Windows CE
// Copyright (C) 1998 Douglas Boling
//======================================================================
#include <windows.h>                 // For all that Windows stuff
#include <prsht.h>                   // Property sheet includes
#include "DlgDemo.h"                 // Program-specific stuff

extern HINSTANCE hInst;
//----------------------------------------------------------------------
// Global data
//
// Identification strings for various WM_xSCROLL notifications
NOTELABELS nlVScroll[] = {{TEXT ("SB_LINEUP       "), 0},
                          {TEXT ("SB_LINEDOWN     "), 1},
                          {TEXT ("SB_PAGEUP       "), 2},
                          {TEXT ("SB_PAGEDOWN     "), 3},
                          {TEXT ("SB_THUMBPOSITION"), 4},
                          {TEXT ("SB_THUMBTRACK   "), 5},
                          {TEXT ("SB_TOP          "), 6},
                          {TEXT ("SB_BOTTOM       "), 7},
                          {TEXT ("SB_ENDSCROLL    "), 8},
};

NOTELABELS nlHScroll[] = {{TEXT ("SB_LINELEFT     "), 0},
                          {TEXT ("SB_LINERIGHT    "), 1},
                          {TEXT ("SB_PAGELEFT     "), 2},
                          {TEXT ("SB_PAGERIGHT    "), 3},
                          {TEXT ("SB_THUMBPOSITION"), 4},
                          {TEXT ("SB_THUMBTRACK   "), 5},
                          {TEXT ("SB_LEFT         "), 6},
                          {TEXT ("SB_RIGHT        "), 7},
                          {TEXT ("SB_ENDSCROLL    "), 8},
};
extern NOTELABELS nlPropPage[];
extern int nPropPageSize;
//======================================================================
// EditDlgProc - Button page dialog box procedure
//
BOOL CALLBACK ScrollDlgProc (HWND hWnd, UINT wMsg, WPARAM wParam,
                             LPARAM lParam) {
    TCHAR szOut[128];
    SCROLLINFO si;
    HWND hwndMain;
    INT i, sPos;

    switch (wMsg) {

        case WM_INITDIALOG:
            // The generic parameter contains
            // the top-level window handle.
            hwndMain = (HWND)((LPPROPSHEETPAGE)lParam)->lParam;
            // Save the window handle in the window structure.
            SetWindowLong (hWnd, DWL_USER, (LONG)hwndMain);
            return TRUE;
        //
        // Reflect WM_COMMAND messages to main window.
        //
        case WM_VSCROLL:
        case WM_HSCROLL:
            // Get the handle of the main window from the user word.
            hwndMain = (HWND) GetWindowLong (hWnd, DWL_USER);

            // Update the report window.
            // Determine whether from horizontal or vertical scroll bar.
            if (GetDlgItem (hWnd, 101) == (HWND)lParam) {
                for (i = 0; i < dim(nlVScroll); i++) {
                    if (LOWORD (wParam) == nlVScroll[i].wNotification) {
                        lstrcpy (szOut, nlVScroll[i].pszLabel);
                        break;
                    }
                }
                if (i == dim(nlVScroll))
                    wsprintf (szOut, TEXT ("notification: %x"),
                              HIWORD (wParam));
            } else {
                for (i = 0; i < dim(nlHScroll); i++) {
                    if (LOWORD (wParam) == nlHScroll[i].wNotification) {
                        lstrcpy (szOut, nlHScroll[i].pszLabel);
                        break;
                    }
                }
                if (i == dim(nlHScroll))
                    wsprintf (szOut, TEXT ("notification: %x"),
                              HIWORD (wParam));
            }
            SendMessage (hwndMain, MYMSG_ADDLINE,
                         MAKEWPARAM (-1, ID_SCROLLPAGE), (LPARAM)szOut);

            // Get scroll bar position.
            si.cbSize = sizeof (si);
            si.fMask = SIF_POS;
            GetScrollInfo ((HWND)lParam, SB_CTL, &si);
            sPos = si.nPos;

            // Act on the scroll code.
            switch (LOWORD (wParam)) {
            case SB_LINEUP:      // Also SB_LINELEFT
                sPos -= 2;
                break;

            case SB_LINEDOWN:    // Also SB_LINERIGHT
                sPos += 2;
                break;

            case SB_PAGEUP:      // Also SB_PAGELEFT
                sPos -= 10;
                break;

            case SB_PAGEDOWN:    // Also SB_PAGERIGHT
                sPos += 10;
                break;

            case SB_THUMBPOSITION:
                sPos = HIWORD (wParam);
                break;
            }
            // Check range.
            if (sPos < 0)
                sPos = 0;
            if (sPos > 100)
                sPos = 100;

            // Update scrollbar position.
            si.cbSize = sizeof (si);
            si.nPos = sPos;
            si.fMask = SIF_POS;
            SetScrollInfo ((HWND)lParam, SB_CTL, &si, TRUE);

            return TRUE;

        //
        // Reflect notify message.
        //
        case WM_NOTIFY:
            // Get the handle of the main window from the user word.
            hwndMain = (HWND) GetWindowLong (hWnd, DWL_USER);

            // Look up notify message.
            for (i = 0; i < nPropPageSize; i++) {
                if (((NMHDR *)lParam)->code ==
                        nlPropPage[i].wNotification) {
                            lstrcpy (szOut, nlPropPage[i].pszLabel);
                            break;
                }
            }
            if (i == nPropPageSize)
                wsprintf (szOut, TEXT ("Notify code:%d"),
                          ((NMHDR *)lParam)->code);

            SendMessage (hwndMain, MYMSG_ADDLINE,
                         MAKEWPARAM (-1, ID_SCROLLPAGE), (LPARAM)szOut);

            return FALSE;  // Return false to force default processing.
    }
    return FALSE;
}