Editing Macintosh Toolbox (section)

=== Window Manager ===
The Window Manager handles the window layer abstraction, maintaining a linked list of WindowRecords in front-to-back order:

'''WindowRecord Structure (156 bytes):'''
<pre>
TYPE WindowRecord = RECORD
    port:           GrafPort;       {QuickDraw port (108 bytes)}
    windowKind:     INTEGER;        {Application or system window}
    visible:        BOOLEAN;        {Window visibility flag}
    hilited:        BOOLEAN;        {Title bar highlight state}
    goAwayFlag:     BOOLEAN;        {Close box present}
    spareFlag:      BOOLEAN;        {Reserved}
    strucRgn:       RgnHandle;      {Structure region}
    contRgn:        RgnHandle;      {Content region}
    updateRgn:      RgnHandle;      {Invalid region needing redraw}
    windowDefProc:  Handle;         {WDEF resource handle}
    dataHandle:     Handle;         {WDEF-specific data}
    titleHandle:    StringHandle;   {Window title}
    titleWidth:     INTEGER;        {Pixel width of title}
    controlList:    ControlHandle;  {Linked list of controls}
    nextWindow:     WindowPeek;     {Next window in list}
    windowPic:      PicHandle;      {Window picture for updates}
    refCon:         LONGINT;        {Application reference}
END;
</pre>

'''Window Definition Procedures (WDEFs):'''
System-supplied WDEFs include:
* '''WDEF 0''': Document window with title bar and optional close/zoom boxes
* '''WDEF 1''': Alert/dialog box with double border
* '''WDEF 2''': Plain box without title bar
* '''WDEF 4''': Floating window (System 7+)
* '''WDEF 16''': Round-cornered window