/*++

Microsoft Confidential
Copyright (c) 1992-1999 Microsoft Corporation
All rights reserved

Module Name:

    edtenvar.h

Abstract:

    Implements the Edit Environment Variables dialog of the
    System Control Panel Applet

Author:

    Scott Hallock (scotthal) 11-Nov-1997

Revision History:

--*/
#include "precomp.h"

#ifdef EXT_DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#include "edtenvar.h"
#include "resource.h"
#include "..\common\util.h"

// Global Variables
UINT g_VarType = INVALID_VAR_TYPE;
UINT g_EditType = INVALID_EDIT_TYPE;
TCHAR g_szVarName[BUFZ];
TCHAR g_szVarValue[BUFZ];

// Help IDs
/*DWORD aEditEnvVarsHelpIds[] = {
    IDC_ENVVAR_EDIT_NAME_LABEL,  (IDH_ENV_EDIT + 0),
    IDC_ENVVAR_EDIT_NAME,        (IDH_ENV_EDIT + 0),
    IDC_ENVVAR_EDIT_VALUE_LABEL, (IDH_ENV_EDIT + 1),
    IDC_ENVVAR_EDIT_VALUE,       (IDH_ENV_EDIT + 1),
    0, 0
};
*/

// Function prototypes
BOOL InitEnvVarsEdit(HWND hDlg);
BOOL EnvVarsEditHandleCommand(HWND hDlg,
								WPARAM wParam,
								LPARAM lParam);

// Function implementation
//------------------------------------------------
INT_PTR APIENTRY EnvVarsEditDlg(HWND hDlg,
							UINT uMsg,
							WPARAM wParam,
							LPARAM lParam)
/*++

Routine Description:

    Handles messages sent to the New.../Edit... dialog.

Arguments:

    hDlg -
        Supplies the window handle

    uMsg -
        Supplies the message being sent

    wParam -
        Supplies message parameter

    lParam -
        Supplies message parameter

Return Value:

    TRUE if message was handled.
    FALSE if message was unhandled.

--*/
{
    BOOL fInitializing = FALSE;

    switch (uMsg) {
        case WM_INITDIALOG: {
            BOOL fSuccess = FALSE;

            fInitializing = TRUE;

            fSuccess = InitEnvVarsEdit(hDlg);
            if (!fSuccess) {
                EndDialog(hDlg, EDIT_ERROR);
            } // if

            fInitializing = FALSE;
            break;
        } // case WM_INITDIALOG

        case WM_COMMAND:
            return EnvVarsEditHandleCommand(hDlg, wParam, lParam);
            break;

        case WM_HELP:      // F1
//            WinHelp((HWND)((LPHELPINFO) lParam)->hItemHandle, HELP_FILE, HELP_WM_HELP, (DWORD) (LPSTR) aEditEnvVarsHelpIds);
            break;
    
        case WM_CONTEXTMENU:      // right mouse click
//            WinHelp((HWND) wParam, HELP_FILE, HELP_CONTEXTMENU, (DWORD) (LPSTR) aEditEnvVarsHelpIds);
            break;

        default:
            return(FALSE);
            break;

    } // switch (uMsg)

    return(TRUE);
}

//------------------------------------------------
BOOL InitEnvVarsEdit(HWND hDlg)
/*++

Routine Description:

    Initializes the Edit Environment Variables dialog by placing initial
    values into the text editing controls if necessary.

Arguments:

    hDlg -
        Supplies window handle

Return Value:

    TRUE if successful
    FALSE if an error occurs

--*/
{
    TCHAR szCaption[EDIT_ENVVAR_CAPTION_LENGTH] = {0};
    BOOL fRetVal = FALSE;
    INT  nResult = 0;

    __try {
        // limit variable names to 259 chars (arbitrary value, but will be in line with shell UI)
        SendDlgItemMessage(hDlg, IDC_ENVVAR_EDIT_NAME, EM_LIMITTEXT, 259, 0);
        // limit variable values to 1023 chars (arbitrary value, but will be in line with shell UI)
        SendDlgItemMessage(hDlg, IDC_ENVVAR_EDIT_VALUE, EM_LIMITTEXT, 1023, 0);

        switch (g_EditType) {
            //
            // If this is to be a New.. dialog, we only need to
            // load the proper capiton for the variable type
            //
            case NEW_VAR:

                switch (g_VarType) {
                    case SYSTEM_VAR:
                        nResult = LoadString(
                            HINST_THISDLL,
                            IDS_NEW_SYSVAR_CAPTION,
                            szCaption,
                            EDIT_ENVVAR_CAPTION_LENGTH
                        );
                        break;

                    case USER_VAR:
                        nResult = LoadString(
                            HINST_THISDLL,
                            IDS_NEW_USERVAR_CAPTION,
                            szCaption,
                            EDIT_ENVVAR_CAPTION_LENGTH
                        );
                        break;

                    default:
                        __leave;
                        break;
                } // switch (g_VarType)

                break;

            //
            // If this is to be an Edit.. dialog, then we need to load the
            // proper caption and fill in initial values for the edit
            // controls
            //
            case EDIT_VAR:

                switch (g_VarType) {
                    case SYSTEM_VAR:
                        nResult = LoadString(
                            HINST_THISDLL,
                            IDS_EDIT_SYSVAR_CAPTION,
                            szCaption,
                            EDIT_ENVVAR_CAPTION_LENGTH
                        );
                        break;

                     case USER_VAR:
                        nResult = LoadString(
                            HINST_THISDLL,
                            IDS_EDIT_USERVAR_CAPTION,
                            szCaption,
                            EDIT_ENVVAR_CAPTION_LENGTH
                        );
                        break;
    
                    default:
                         __leave;
                        break;
                } // switch (g_VarType)
        
                SetDlgItemText(
                    hDlg,
                    IDC_ENVVAR_EDIT_NAME,
                    g_szVarName
                );
                SetDlgItemText(
                    hDlg,
                    IDC_ENVVAR_EDIT_VALUE,
                    g_szVarValue
                );
        
                break;
        } // switch (g_EditType)

        fRetVal = SendMessage(
                GetDlgItem(hDlg, IDC_ENVVAR_EDIT_NAME),
                EM_SETSEL,
                0,
                -1
        ) ? TRUE : FALSE;
        fRetVal = SendMessage(
                GetDlgItem(hDlg, IDC_ENVVAR_EDIT_VALUE),
                EM_SETSEL,
                0,
                -1
        ) ? TRUE : FALSE;
        SetFocus(GetDlgItem(hDlg, IDC_ENVVAR_EDIT_NAME));

        fRetVal = SetWindowText(hDlg, szCaption);

    } // __try
    __finally {
        //
        // Nothing to clean up.  __try is only there for __leave on
        // failure capability.
        //
    } // __finally

    return(fRetVal);
}

//------------------------------------------------
BOOL EnvVarsEditHandleCommand(HWND hDlg,
								WPARAM wParam,
							    LPARAM lParam)
/*++

Routine Description:

    Handles WM_COMMAND messages sent to the Edit Environment Variables
    dialog

Arguments:

    hDlg -
        Supplies window handle

    wParam -
        Supplies message parameter

    lParam -
        Supplies message parameter

Return Value:

    TRUE if message was handled
    FALSE if message was unhandled

--*/
{
    switch (LOWORD(wParam)) {

        case IDOK:
            GetDlgItemText(
                hDlg,
                IDC_ENVVAR_EDIT_NAME,
                g_szVarName,
                BUFZ
            );
            GetDlgItemText(
                hDlg,
                IDC_ENVVAR_EDIT_VALUE,
                g_szVarValue,
                BUFZ
            );
            EndDialog(hDlg, EDIT_CHANGE);
            break;

        case IDCANCEL:
            EndDialog(hDlg, EDIT_NO_CHANGE);
            break;

        default:
            return(FALSE);
            break;

    } // switch (LOWORD(wParam))

    return(TRUE);
}