Developer CD Series 1996 February: Tool Chest/Apple Developer CD Series Tool Chest February 1996 (Apple Computer)(1996).iso/Tool Chest/Text/WASTE/WASTE 1.1.2 Distribution/Demo Source/WEDemoEvents.p

Text File | 1995-10-12 | 10.6 KB | 449 lines | [TEXT/CWIE]

unit WEDemoEvents;

{ WASTE DEMO PROJECT: }
{ Events Handling }

{ Copyright © 1993-1995 Marco Piovanelli }
{ All Rights Reserved }

interface
    uses
        WEDemoIntf;

    function InitializeEvents: OSErr;
    procedure DoWindowEvent ({const} var event: EventRecord);
    procedure ProcessEvent;

implementation
    uses
        AppleEvents, AERegistry, DiskInit, TextServices, WEDemoMenus, WEDemoScripting, WEDemoWindows;

    const

{ possible values for HandleOpenDocument refCon parameter }

        kDoOpen = 0;
        kDoPrint = 1;

    var

        gSleepTime: LongInt;                    { sleep time for WaitNextEvent }
        gMouseRgn: RgnHandle;                { mouse region for WaitNextEvent }

    procedure AdjustCursor (mouseLoc: Point;
                                    mouseRgn: RgnHandle);
        var
            window: WindowRef;
    begin

{ by default, set mouseRgn to the whole QuickDraw coordinate plane, }
{ so that we never get mouse moved events }
        SetRectRgn(mouseRgn, -maxint, -maxint, maxint, maxint);

{ give text services a chance to set the cursor shape }
        if (gHasTextServices) then
            if (SetTSMCursor(mouseLoc)) then
                Exit(AdjustCursor);

{ if there is a window open, give WEAdjustCursor an opportunity to set the cursor }
{ WEAdjustCursor intersects mouseRgn (if supplied) with a region within which }
{ the cursor is to retain its shape. }
{ (if the cursor is outside the view region, this is subtracted from mouseRgn) }

        window := FrontWindow;
        if (window <> nil) then
            if (WEAdjustCursor(mouseLoc, mouseRgn, DocumentPeek(window)^.we)) then
                Exit(AdjustCursor);

{ set the cursor to the arrow cursor }
{$IFC NOT UNDEFINED THINK_PASCAL}
        SetCursor(arrow);
{$ELSEC}
        SetCursor(qd.arrow);
{$ENDC}

    end;  { AdjustCursor }

    procedure DoMouseDown ({const} var event: EventRecord);
        var
            window: WindowRef;
            partCode: Integer;
    begin

{ find out where this click went down in }
        partCode := FindWindow(event.where, window);

{ dispatch on partCode }
        case partCode of

            inMenuBar:
                begin
                    PrepareMenus;
                    DoMenuChoice(MenuSelect(event.where));
                end;

            inSysWindow:
                SystemClick(event, window);

            inContent:
                if (DoContent(event.where, event, window)) then
                    SelectWindow(window);

            inDrag:
                DoDrag(event.where, window);

            inGrow:
                DoGrow(event.where, window);

            inGoAway:
                if (TrackGoAway(window, event.where)) then
                    if (DoClose(closingWindow, savingAsk, window) <> noErr) then
                        ;

            inZoomIn, inZoomOut:
                if (TrackBox(window, event.where, partCode)) then
                    DoZoom(partCode, window);

            otherwise
                ;
        end;  { case partCode }
    end;  { DoMouseDown }

    procedure DoKeyDown ({const} var event: EventRecord);
        const

{ virtual key codes generated by some function keys }
            keyF1 = $7A;
            keyF2 = $78;
            keyF3 = $63;
            keyF4 = $76;
        var
            key: Char;
    begin

{ extract character code from event message }
        key := Char(BAND(event.message, charCodeMask));

{ map function keys to the equivalent command+key combos }
{ note that all function keys generate the same character code, i.e. $10 }
        if (key = CHR($10)) then
            begin
                event.modifiers := BOR(event.modifiers, cmdKey);
                case BSR(BAND(event.message, keyCodeMask), 8) of

                    keyF1:
                        key := 'z';

                    keyF2:
                        key := 'x';

                    keyF3:
                        key := 'c';

                    keyF4:
                        key := 'v';

                    otherwise
                        key := CHR(0);
                end;  { case }
            end;

{ command + printable character combos are routed to MenuKey }
        if (BAND(event.modifiers, cmdKey) <> 0) and (key >= CHR(32)) then
            begin
                PrepareMenus;
                DoMenuChoice(MenuKey(key));
            end
        else
            DoKey(key, event);
    end;  { DoKeyDown }

    procedure DoDiskEvent ({const} var event: EventRecord);
        var
            dialogCorner: Point;
            err: OSErr;
    begin
        if (BSR(event.message, 16) <> noErr) then
            begin
                SetPt(dialogCorner, 112, 80);
                err := DIBadMount(dialogCorner, event.message);
            end;
    end;  { DoDiskEvent }

    procedure DoOSEvent ({const} var event: EventRecord);
        var
            osMessage: Integer;
            window: WindowRef;
    begin

{ extract the OS message field from the event record }
        osMessage := BSR(BAND(event.message, osEvtMessageMask), 24);

{ dispatch on osMessage }
        case osMessage of

            suspendResumeMessage:
                begin
                    window := FrontWindow;
                    if (window <> nil) then
                        DoActivate(BAND(event.message, resumeFlag) <> 0, window);
                end;

            mouseMovedMessage:
                ;

            otherwise
                ;
        end;  { case }
    end;  { DoOSEvent }

    procedure DoHighLevelEvent ({const} var event: EventRecord);
    begin
        if (AEProcessAppleEvent(event) <> noErr) then
            ;
    end;  { DoHighLevelEvent }

    procedure DoNullEvent ({const} var event: EventRecord);
        var
            window: WindowRef;
    begin
        window := FrontWindow;
        if (window <> nil) then
            WEIdle(gSleepTime, DocumentPeek(window)^.we)
        else
            gSleepTime := maxLongInt;
    end;  { DoNullEvent }

    procedure DoWindowEvent ({const} var event: EventRecord);
        var
            window: WindowRef;
    begin

{ the message field of the event record contains the window pointer }
        window := WindowRef(event.message);

{ make sure this window is an application window; check the windowKind field }
        if (WindowPeek(window)^.windowKind <> userKind) then
            Exit(DoWindowEvent);

        case event.what of

            updateEvt:
                DoUpdate(window);

            activateEvt:
                DoActivate(BAND(event.modifiers, activeFlag) <> 0, window);

        end;  { case }
    end;  { DoWindowEvent }

    procedure ProcessEvent;
        const
            kHighLevelEvent = 23;        { copied from "EPPC.p" }
        var
            event: EventRecord;
            gotEvent: Boolean;
    begin

        gotEvent := WaitNextEvent(everyEvent, event, gSleepTime, gMouseRgn);

{ give text services a chance to intercept this event }
        if (gHasTextServices) then
            if TSMEvent(event) then
                ;

{ adjust cursor shape and set mouse region }
{ (we assume event.where is the current mouse position in global coordinates }
{ if event.what <= osEvt; high-level events store the event ID there) }

        if (event.what <= osEvt) then
            AdjustCursor(event.where, gMouseRgn);

{ dispatch on event.what }
        case event.what of

            nullEvent:
                DoNullEvent(event);

            mouseDown:
                DoMouseDown(event);

            keyDown, autoKey:
                DoKeyDown(event);

            updateEvt, activateEvt:
                DoWindowEvent(event);

            diskEvt:
                DoDiskEvent(event);

            osEvt:
                DoOSEvent(event);

            kHighLevelEvent:
                DoHighLevelEvent(event);

            otherwise
                ;                                            { ignore other events }
        end;  { case }

        if (gotEvent) then
            gSleepTime := 0;                        { force early idle after non-idle event }

    end;  { ProcessEvent }

    function GotRequiredParams ({const} var ae: AppleEvent): OSErr;
        var
            returnedType: DescType;
            actualSize: Size;
            err: OSErr;
    begin
        err := AEGetAttributePtr(ae, keyMissedKeywordAttr, typeWildCard, returnedType, nil, 0, actualSize);
        if (err = errAEDescNotFound) then
            GotRequiredParams := noErr
        else if (err = noErr) then
            GotRequiredParams := errAEParamMissed
        else
            GotRequiredParams := err;
    end;  { GotRequiredParams }

    function HandleOpenDocument ({const} var ae, reply: AppleEvent;
                                    refCon: LongInt): OSErr;
        var
            docList: AEDescList;
            keyword: AEKeyword;
            returnedType: DescType;
            actualSize: Size;
            numberOfDocuments, i: LongInt;
            fileSpec: FSSpec;

        procedure CheckErr (err: OSErr);
        begin
            if (err <> noErr) then
                begin
                    HandleOpenDocument := err;
                    err := AEDisposeDesc(docList);
                    Exit(HandleOpenDocument);
                end;
        end;  { CheckErr }

    begin
        HandleOpenDocument := noErr;

{ extract direct parameter from the Apple Event }
        CheckErr(AEGetParamDesc(ae, keyDirectObject, typeAEList, docList));

{ perform the recommended check for additional required parameters }
        CheckErr(GotRequiredParams(ae));

{ count the items in the list of aliases }
        CheckErr(AECountItems(docList, numberOfDocuments));

        for i := 1 to numberOfDocuments do
            begin

{ coerce the nth alias to a file system specification record }
                CheckErr(AEGetNthPtr(docList, i, typeFSS, keyword, returnedType, @fileSpec, SizeOf(fileSpec), actualSize));

{ open the specified file }
                CheckErr(CreateWindow(@fileSpec));
            end;  { for }

{ dispose of the alias list }
        CheckErr(AEDisposeDesc(docList));

    end;  { HandleOpenDocument }

    function HandleOpenApplication ({const} var ae, reply: AppleEvent;
                                    refCon: LongInt): OSErr;
        var
            err: OSErr;
    begin

{ perform the recommended check for additional required parameters }
        err := GotRequiredParams(ae);
        if (err <> noErr) then
            begin
                HandleOpenApplication := err;
                Exit(HandleOpenApplication);
            end;

{ create a new window from scratch }
        HandleOpenApplication := CreateWindow(nil);

    end;  { HandleOpenApplication }

    function HandleQuitApplication ({const} var ae, reply: AppleEvent;
                                    refCon: LongInt): OSErr;
        var
            optKey: AEKeyword;
            actualType: DescType;
            actualSize: Size;
            saving: SavingOption;
            err: OSErr;
    begin

{ default saving option is savingAsk }
        saving := savingAsk;

{ extract the optional save options }
        err := AEGetParamPtr(ae, keyAESaveOptions, typeEnumerated, actualType, @optKey, SizeOf(optKey), actualSize);
        if (err = noErr) then
            begin
                if (optKey = kAEYes) then
                    saving := savingYes
                else if (optKey = kAENo) then
                    saving := savingNo
                else if (optKey <> kAEAsk) then
                    begin
                        HandleQuitApplication := paramErr;        { for want of a better code }
                        Exit(HandleQuitApplication);
                    end;
            end;

{ perform the recommended check for additional required parameters }
        err := GotRequiredParams(ae);
        if (err <> noErr) then
            begin
                HandleQuitApplication := err;
                Exit(HandleQuitApplication);
            end;

        HandleQuitApplication := DoQuit(saving);
    end;  { HandleQuitApplication }

{ THINK Pascal compiler directive: put the following code in the "Init" segment }
{$S Init}

    function InitializeEvents: OSErr;

        procedure CheckErr (err: OSErr);
        begin
            if (err <> noErr) then
                begin
                    InitializeEvents := err;
                    Exit(InitializeEvents);
                end;
        end;  { CheckErr }

    begin
        InitializeEvents := noErr;

{ allocate space for the mouse region }
        gMouseRgn := NewRgn;

{ install Apple event handlers for the Required Suite }
        CheckErr(AEInstallEventHandler(kCoreEventClass, kAEOpenApplication, NewAEEventHandlerProc(@HandleOpenApplication), 0, false));
        CheckErr(AEInstallEventHandler(kCoreEventClass, kAEOpenDocuments, NewAEEventHandlerProc(@HandleOpenDocument), kDoOpen, false));
        CheckErr(AEInstallEventHandler(kCoreEventClass, kAEPrintDocuments, NewAEEventHandlerProc(@HandleOpenDocument), kDoPrint, false));
        CheckErr(AEInstallEventHandler(kCoreEventClass, kAEQuitApplication, NewAEEventHandlerProc(@HandleQuitApplication), 0, false));

{ install Apple event handlers for a subset of the Core Suite }
        CheckErr(InstallCoreHandlers);

{ install Apple event handlers for inline input }
        CheckErr(WEInstallTSMHandlers);

    end;  { InitializeEvents }

end.