//
// EX03WIN.CPP
//
//  C++/Windows Example program for ArchiveLib 2.0
//
//  Copyright (c) Greenleaf Software, Inc. 1994 - 1996
//  All Rights Reserved
//
// MEMBERS/FUNCTIONS DEMONSTRATED
//
//  ALArchiveBase::Delete()
//
// DESCRIPTION
//
// EX03WIN.CPP demonstrates ALArchiveBase::Delete().  It lets you
// select a list of files to delete from an archive, then performs
// the deletion.  The list boxes are updated right afterwards so you
// can see the results.
//
// This is a very simple Windows program.  It works by creating a modeless
// dialog box, then wrapping a framing window around it.  By using a framing
// window as the main window we are able to handle accelerator keys, menus,
// and icons a bit easier. Because of this approach, WinMain() and
// MainWndProc() are not very exciting, and have been moved down to the
// bottom of the file.  MainWndProc() does handle menus and accelerator
// keys, so it comes first.
//
// REVISION HISTORY
//
//  February 1, 1996  2.0A  : Second release
//

#define STRICT
#include <windows.h>
#include <stdarg.h>

#include "al.h"
#include "ex03win.h"

//
int NEAR iInstanceNumber;
HINSTANCE hInstance;
HWND hDlgMain = 0;
ALArchive *pArchive = 0;

void Delete( HWND hDlg );
void SizeFramingWindow( HWND hDlg );

//
// This function gets the name of an archive, then uses the
// ALArchiveBase::FillListBox() function to fill it up with
// names.
//

void ReadArchive( HWND hDlg, int archive_name, int list_box )
{
    char input_name[ 128 ];

    GetDlgItemText( hDlg, archive_name, input_name, 128 );
    SendDlgItemMessage( hDlg, archive_name, EM_SETSEL, (WPARAM) -1, (LPARAM) -1 );
#if defined( ZIP )
    ALPkArchive archive( input_name );
#else
    ALGlArchive archive( input_name );
#endif
    archive.FillListBox( hDlg, list_box );
}

//
// This function performs the deletion.  it gets the name of the archive
// from a text box, then gets the list, then sets marks on the list based
// on the names set in the list box.  The archive delete function then takes
// care of the hard work.
//
// There is one tricky bit here.  The pArchive pointer is a global variable.
// If we are in the middle of updating or deleting, the other functions
// in this program can figure that out by looking at the pointer.  They
// can also set the error member in pArchive, causing an abort of the
// delete process.
//

void Delete( HWND hDlg )
{
    char input_name[ 128 ];

    ALWindowsMessage monitor( AL_MONITOR_JOB,
                              GetDlgItem( hDlg, AL_PROGRESS_TEXT ),
                              AL_SEND_RATIO,
                              GetDlgItem( hDlg, AL_PROGRESS_BAR ),
                              ALGaugeSetPosition );
    GetDlgItemText( hDlg, AL_INPUT, input_name, 128 );
#if defined( ZIP )
    pArchive = new ALPkArchive( input_name );
    ALEntryList list( &monitor, PkTools() );
#else
    pArchive = new ALGlArchive( input_name );
    ALEntryList list( &monitor, GlTools() );
#endif
    if ( !pArchive )
        return;
    pArchive->ReadDirectory( list );
    list.ClearMarks();
    int count = list.SetMarksFromListBox( hDlg, AL_INPUT_LIST );
    EditDisplay( hDlg,
                 AL_DEBUG,
                 "%d file%s selected\r\n",
                 count,
                 ( count > 1 ? "s are" : " is" ) );
//
// The new archive has a blank name.  This tells the delete function
// to rename it after the deletion is done.
//
#if defined( ZIP )
    ALPkArchive archive( "" );
#else
    ALGlArchive archive( "" );
#endif
    pArchive->Delete( list, archive );
    SetDlgItemText( hDlg, AL_OUTPUT, pArchive->GetStorageObject()->mName.GetSafeName() );
    ReadArchive( hDlg, AL_INPUT, AL_INPUT_LIST );
    ReadArchive( hDlg, AL_OUTPUT, AL_OUTPUT_LIST );
    delete pArchive;
    pArchive = 0;
}

//
// This is the window procedure for the modeless dialog.  It is where
// all the commands and so on are handled.  Most of the activity in
// the program is invoked as a results of button presses in the
// main dialog windows.
//

BOOL AL_EXPORT CALLBACK MainDialogProc( HWND hDlg,
                                        UINT message,
                                        WPARAM wParam,
                                        LPARAM )
{
    switch ( message ) {
//
// On initialization, we size our framing windows, then set up the window
// caption, followd by setting up the two text boxes in this dialog.
//
        case WM_INITDIALOG :
            SizeFramingWindow( hDlg );
            char buf[ 81 ];
            wsprintf( buf, "Windows Example 03 <%d>", iInstanceNumber );
            SetWindowText( GetParent( hDlg ), buf );
#if defined( ZIP )
            wsprintf( buf, "win%02d.zip", iInstanceNumber );
#else
            wsprintf( buf, "win%02d.gal", iInstanceNumber );
#endif
            SetDlgItemText( hDlg, AL_INPUT, buf );
            SetDlgItemText( hDlg, AL_OUTPUT, "" );
            return( TRUE );
//
// WM_COMMAND message are generated for most of the button presses and
// keystrokes that we are concerned with.
//
        case WM_COMMAND :
            switch ( wParam ) {
//
// IDOK indicatest that the user pressed enter.  We process that as
// a command to read the input archive if the focus is in the right spot.
//
                case IDOK : //User has pressed enter
                    if ( GetFocus() == GetDlgItem( hDlg, AL_INPUT ) ) {
                        ReadArchive( hDlg, AL_INPUT, AL_INPUT_LIST );
                        ReadArchive( hDlg, AL_OUTPUT, AL_OUTPUT_LIST );
                    }
                    break;
//
// When we are supposed to read the input archive, it usually means there
// is a new filename there.  That means we read in the archive using
// the function provided here, then read in the contents of the backup
// archive, if one exists.
//
                case AL_READ_INPUT :
                    ReadArchive( hDlg, AL_INPUT, AL_INPUT_LIST );
                    ReadArchive( hDlg, AL_OUTPUT, AL_OUTPUT_LIST );
                    return TRUE;
//
// Before we perform the deletion, we have to check to see if another
// deletion is already in progress.
//
                case AL_DELETE :
                    if ( !pArchive ) {
                        Delete( hDlg );
                        if ( pArchive ) {
                            delete pArchive;
                            pArchive = 0;
                        }
                    }
                    return TRUE;
//
// Normally a request to exit is no big deal.  But if I am already in the
// process of performing a deletion, I don't want to try and exist.
// In that case, I just set the error status for the archive, so it will
// abort at its own sweet pace.
//
                case AL_EXIT :
                case WM_QUIT :
                case WM_DESTROY :
                    if ( pArchive ) {
                        pArchive->GetStorageObject()->mStatus.SetError( 
                                        AL_USER_ABORT, 
                                        "User pressed abort key" );
                        FlashWindow( GetParent( hDlg ), 1 );
                        FlashWindow( GetParent( hDlg ), 0 );
                        return FALSE;
                    }
                    PostMessage( GetParent( hDlg ),WM_DESTROY, 0, 0 );
                    DestroyWindow( hDlgMain );
                    hDlgMain = 0;
                    return TRUE;
//
// To abort a deletion in progress, we just call the set error routine
// and set the archives status to an error.  The delete function will see
// this as soon as it comes up for air, and it will exit prematurely.
//
                case AL_ABORT :
                    if ( pArchive )
                        pArchive->GetStorageObject()->mStatus.SetError( 
                                                AL_USER_ABORT, 
                                                "User pressed abort key" );
                    return TRUE;

                default :
                    break;
            }
            break;
    }
    return FALSE;
}

//
// The about box dialog procedure is pretty boring.  The most interesting
// thing it does is center itself on the screen.
//

BOOL AL_EXPORT CALLBACK
AboutDialogProc( HWND hDlg, UINT message, WPARAM wParam, LPARAM )
{
    switch ( message ) {
        case WM_INITDIALOG :
            RECT rc;
            GetWindowRect( hDlg, &rc );
            SetWindowPos( hDlg,
                          NULL,
                          ((GetSystemMetrics(SM_CXSCREEN) - (rc.right - rc.left)) / 2),
                          ((GetSystemMetrics(SM_CYSCREEN) - (rc.bottom - rc.top)) / 2),
                          0, 0, SWP_NOSIZE | SWP_NOACTIVATE);
             break;
        case WM_COMMAND :
            switch ( wParam ) {
                case IDOK :
                case WM_QUIT :
                case WM_DESTROY :
                    EndDialog( hDlg, TRUE );
                    return TRUE;
            }
            break;
    }
    return FALSE;
}

//
// The main window is nothing more than a shell that exists to create
// the dialog box, take menu commands, and process accelerator keys.
//

LONG AL_EXPORT CALLBACK MainWndProc( HWND hWnd,
                                     UINT message,
                                     WPARAM wParam,
                                     LPARAM lParam )
{
    switch ( message ) {
        case WM_COMMAND:
            switch( wParam ) {
                case AL_GOTO_INPUT :
                    if ( hDlgMain)
                        SetFocus( GetDlgItem( hDlgMain, AL_INPUT ) );
                    break;
                case AL_ABOUT :
                    DialogBox( hInstance, "ALAboutDialog", 0, AboutDialogProc );
                    return TRUE;
                case AL_EXIT :
                    PostQuitMessage( 0 );
            }
            break;
        case WM_SETFOCUS:
            SetFocus( hDlgMain ); // insure that the Dialog Box has the focus
            break;
        case WM_DESTROY:
            PostQuitMessage( 0 );
            break;
    }
    return DefWindowProc( hWnd, message, wParam, lParam );
}

//
// WinMain calls the initialization routine for the progress gauge,
// registers our class.  It then creates the dialog, and starts the
// message pump.
//

int PASCAL WinMain( HINSTANCE instance,
                    HINSTANCE previous_instance,
                    LPSTR,
                    int nCmdShow )
{
    hInstance = instance;
    if ( !ALGaugeInit( instance, previous_instance ) )
        return (FALSE);
    if ( previous_instance == 0 ) {
        WNDCLASS wc;
        wc.style         = 0;
        wc.lpfnWndProc   = MainWndProc;
        wc.cbClsExtra    = 0;
        wc.cbWndExtra    = 0;
        wc.hInstance     = hInstance;
        wc.hIcon         = LoadIcon( hInstance, "ALIcon" );
        wc.hCursor       = LoadCursor(NULL,IDC_ARROW);
        wc.hbrBackground = (HBRUSH) GetStockObject( WHITE_BRUSH );
        wc.lpszMenuName  = "ALMenu";
        wc.lpszClassName = "GreenleafDialogClass";
        if ( !RegisterClass( &wc ) )
            return FALSE;
        iInstanceNumber = 0;
    } else {
#ifndef AL_FLAT_MODEL
        GetInstanceData( previous_instance,
                         (PBYTE) &iInstanceNumber,
                         sizeof iInstanceNumber );
#endif
        iInstanceNumber++;
    }
    HWND hWnd = CreateWindow( "GreenleafDialogClass",
                              "Greenleaf Example Program",
                              WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU,
                              CW_USEDEFAULT,
                              0,
                              0,
                              0,
                              NULL,
                              NULL,
                              hInstance,
                              NULL );

    FARPROC lpfn = MakeProcInstance( (FARPROC) MainDialogProc, hInstance );
    hDlgMain = CreateDialog( hInstance, "ALMainDialog", hWnd, (DLGPROC) lpfn );
    ShowWindow( hWnd, nCmdShow );
    ShowWindow( hDlgMain, SW_SHOW );
    MSG msg;
    HACCEL hAccel = LoadAccelerators( hInstance, "ALAccelerator" );
    while ( GetMessage ( &msg, NULL, NULL, NULL ) ) {
        HWND hWndAccel = GetActiveWindow();
        if ( !( hWndAccel && TranslateAccelerator( hWndAccel, hAccel, &msg ) ) )
        {
            if ( hDlgMain == NULL || !IsDialogMessage( hDlgMain,&msg ) ) {
                TranslateMessage( &msg );
                DispatchMessage( &msg );
            }
        }
    }
    return (msg.wParam);
}


//
// I need this routine for one purpose only.  After the dialog is loaded,
// it calls this routine, which adjusts the size of the framing window to
// fit exactly around the dialog box.  It also moves it to the center of
// the screen.
//

void SizeFramingWindow( HWND hDlg )
{
    RECT rect;

    GetWindowRect( hDlg, &rect );
    int y = GetSystemMetrics( SM_CYSCREEN );
    y -= ( rect.bottom - rect.top );
    y -= GetSystemMetrics( SM_CYMENU ) + GetSystemMetrics( SM_CYCAPTION );
    y /= 2;
    int x = GetSystemMetrics( SM_CXSCREEN );
    x -= rect.right - rect.left;
    x /= 2;
    SetWindowPos( GetParent( hDlg ), NULL, x, y,
                  rect.right-rect.left,
                  rect.bottom-rect.top +
                  GetSystemMetrics( SM_CYMENU ) +
                  GetSystemMetrics( SM_CYCAPTION ),
                  SWP_NOZORDER );
}