/*

    File:       Menus.c

    Contains:   Handles the application's menus

    Written by: Chris White 

    Copyright:  Copyright © 1996-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                8/10/1999   Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

*/

#pragma segment Core

#ifndef __MENUS__

    #include <Menus.h>

#endif

#ifndef __WINDOWS__

    #include <Windows.h>

#endif

#ifndef __DIALOGS__

    #include <Dialogs.h>

#endif

#ifndef __TEXTUTILS__

    #include <TextUtils.h>

#endif

#ifndef __DESK__

    #include <Desk.h>

#endif

// Application includes

#ifndef __BAREBONES__

    #include "BareBones.h"

#endif

#ifndef __PROTOTYPES__

    #include "Prototypes.h"

#endif

// static includes

static void     DoAppleCmds ( SInt16 theMenu, SInt16 theItem );

static void     DoFileCmds ( SInt16 theMenu, SInt16 theItem );

static void     DoProgressBarsCmds ( SInt16 theMenu, SInt16 theItem );

static Boolean  EnableFileCmds ( WindowRef frontWindow );

static Boolean  EnableProgressBarsCmds ( WindowRef frontWindow );

static void     SetItemEnable ( MenuHandle theMenu, SInt16 theItem, Boolean bEnabled );

void MenuDispatch ( SInt32 menuResult )

{

    SInt16  theMenu = (menuResult >> 16);                   // menu selected

    SInt16  theItem = (menuResult & 0x0000FFFF);            // item selected

    switch (theMenu)

    {

        case kAppleMenu: 

            DoAppleCmds ( theMenu, theItem );

        break;

        case kFileMenu: 

            DoFileCmds ( theMenu, theItem );

        break;

        case kProgressBarsMenu:

            DoProgressBarsCmds ( theMenu, theItem );

        break;

    }

    HiliteMenu ( 0 );           // un-hilite selected menu

    return;

} // MenuDispatch

void AdjustMenus ( void )

{

    Boolean     bRedraw = false;

    WindowRef   frontWindow;

    frontWindow = FrontWindow ( );

    if ( EnableFileCmds ( frontWindow ) )

        bRedraw = true;

    if ( EnableProgressBarsCmds ( frontWindow ) )

        bRedraw = true;

    if ( bRedraw )

        DrawMenuBar ( );

    return;

} // AdjustMenus

static void DoAppleCmds ( SInt16 theMenu, SInt16 theItem )

{

    #pragma unused(theMenu)

    Str255  name;           // string for DA name

    switch ( theItem )

    {

        case cAbout:

            Alert ( kAboutDialog, nil );

        break;

        default:

            GetMenuItemText ( GetMenuHandle ( kAppleMenu ), theItem, (StringPtr) &name );

            OpenDeskAcc ( (StringPtr) &name );

        break;

    }

    return;

} // DoAppleCmds

static void DoFileCmds ( SInt16 theMenu, SInt16 theItem )

{   

    #pragma unused(theMenu)

    switch ( theItem )

    {

        case cQuit:

            gQuit = true;

        break;

    }

    return;

} // DoFileCmds

static void DoProgressBarsCmds ( SInt16 theMenu, SInt16 theItem )

{   

    OSErr           theErr = noErr;

    Str255          theText;

    static Boolean  bUseThreads = false;

    switch ( theItem )

    {

        case cToggleThreads:

            bUseThreads = !bUseThreads;

            CheckItem ( GetMenuHandle ( theMenu ), theItem, bUseThreads );

        break;

        case cStandard:

            GetIndString ( theText, kMiscStrings, kProgressStr );

            if ( bUseThreads )

                theErr = ThreadedProgressOperation ( ThreadedStandardDemoOperation, nil,

                                                                    theText, nil, false );

            else

                theErr = ProgressOperation ( StandardDemoOperation, nil, theText );

        break;

        case cBarberPole:

            GetIndString ( theText, kMiscStrings, kProgressStr );

            if ( bUseThreads )

                theErr = ThreadedProgressOperation ( ThreadedBarberPoleDemoOperation, nil,

                                                                    theText, nil, true );

            else

                theErr = ProgressOperation ( BarberPoleDemoOperation, nil, theText );

        break;

    }

    if ( theErr )

        AlertUser ( kGenericErrorStr, theErr, "\p" );

    return;

} // DoProgressBarsCmds

static Boolean EnableFileCmds ( WindowRef frontWindow )

{

    static Boolean  bIsEnabled = true;

    Boolean         bHasDialog = false;

    Boolean         bUpdate = false;

    MenuHandle      theMenu = GetMenuHandle ( kFileMenu );

    bHasDialog = frontWindow && GetWindowKind ( frontWindow ) == dialogKind;

    if ( bIsEnabled == bHasDialog )     // Or bIsEnabled != !bHasDialog

    {

        SetItemEnable ( theMenu, 0, !bHasDialog );

        bIsEnabled = !bHasDialog;

        bUpdate = true;

    }

    SetItemEnable ( theMenu, cQuit, !bHasDialog );

    return bUpdate;

} // EnableFileCmds

static Boolean EnableProgressBarsCmds ( WindowRef frontWindow )

{

    static Boolean  bIsEnabled = true;

    Boolean         bHasDialog = false;

    Boolean         bUpdate = false;

    MenuHandle      theMenu = GetMenuHandle ( kProgressBarsMenu );

    bHasDialog = frontWindow && GetWindowKind ( frontWindow ) == dialogKind;

    if ( bIsEnabled == bHasDialog )     // Or bIsEnabled != !bHasDialog

    {

        SetItemEnable ( theMenu, 0, !bHasDialog );

        bIsEnabled = !bHasDialog;

        bUpdate = true;

    }

    SetItemEnable ( theMenu, cToggleThreads, gHasThreadManager );

    return bUpdate;

} // EnableProgressBarsCmds

static void SetItemEnable ( MenuHandle theMenu, SInt16 theItem, Boolean bEnabled )

{

    if ( theMenu )

    {

        if ( bEnabled )

            EnableItem ( theMenu, theItem );

        else

            DisableItem ( theMenu, theItem );

    }

    return;

} // SetItemEnable