Library Lines;

{define Debug}

{$ifndef Debug}
{$R-,I-,D-,L-,S-,V-,W-,G+}
{$endif}

{$C MOVEABLE PRELOAD DISCARDABLE}
{$R LINES}

Uses
  WinTypes,WinProcs,Strings,WinDOS;

{$I ADD-IN.INC}
{$I ..\VERS}

Const
  LineThick : Integer = 2;
  DiscMode : Boolean = True;

  CLBVer : VerString = AddInMasterVer;

Var
  GTxInBtn : Boolean;

{$D Lines Add-In for Clysbar - clySmic Software}

{-----------------------------------------------}

{ --- Perform Add-In's initialization --- }

Function AddInInit(CurVer : PChar; TxInBtn : Boolean) : InitResult; Export;

Begin
  Randomize;

  { Version check }
  If StrLComp(CurVer,CLBVer,3) <> 0
    Then AddInInit := InitNotOk
    Else AddInInit := InitOk;

  { Save text-in-button flag }
  GTxInBtn := TxInBtn;
End {AddInInit};

{-----------------------------------------------}

{ --- Paint on the button (Clysbar does the background) --- }

Procedure AddInPaint(Wnd : HWnd; DC : HDC; Pressed : Boolean); Export;

Begin
End {AddInPaint};

{-----------------------------------------------}

{ --- Tell Clysbar what kind of timer we need --- }

Function AddInTimerNeeded : Integer; Export;

Begin
  AddInTimerNeeded := ait_Fast;
End {TimerNeeded};

{-----------------------------------------------}

{ --- Proc called when timer expires, perform timed duties --- }

Procedure AddInTimerTick(Wnd : HWnd; DC : HDC); Export;

Const
  xSav : Integer = 5;
  ySav : Integer = 5;

Var
  Rect : TRect;
  OldPen,ThePen : HPen;

Begin
  { If add-in is never uncovered, Wnd will be NULL }
  If Wnd = 0
    Then Exit;

  { Don't draw over button "edges" }
  GetClientRect(Wnd,Rect);
  If GTxInBtn
    Then Rect.Right := Rect.Left + GetSystemMetrics(sm_cxIcon) + 18;
  InflateRect(Rect,-6,-6);

  { Draw a random line in a random color }
  ThePen := CreatePen(ps_Solid,LineThick,RGB(Random(256),Random(256),Random(256)));
  OldPen := SelectObject(DC,ThePen);

  If DiscMode
    Then Begin
           { Disconnected lines }
           MoveTo(Dc,Random(Rect.Right-2) + Rect.Left-2,
                     Random(Rect.Bottom-2) + Rect.Top-2);
           LineTo(Dc,Random(Rect.Right-2) + Rect.Left-2,
                     Random(Rect.Bottom-2) + Rect.Top-2);
         End
    Else Begin
           { Connected lines }
           MoveTo(DC,xSav,ySav);
           xSav := Random(Rect.Right-2) + Rect.Left-2;
           ySav := Random(Rect.Bottom-2) + Rect.Top-2;
           LineTo(DC,xSav,ySav);
         End;

  { Clean up }
  SelectObject(DC,OldPen);
  DeleteObject(ThePen);
End {AddInTimerTick};

{-----------------------------------------------}

{ --- Proc called when button pressed --- }

Procedure AddInPressed(Wnd : HWnd; DC : HDC); Export;

Begin
  LineThick := Random(4) + 1;    {1..4}

  DiscMode := Not DiscMode;

  AddInPaint(Wnd,DC,False);
End {AddInPressed};

{-----------------------------------------------}

{ --- Exit processing for Add-In --- }

Procedure AddInExit; Export;

Begin
End {AddInExit};

{-----------------------------------------------}

{ --- Clysbar queries Add-In about itself --- }

Procedure AddInAbout(Str1,Str2 : PChar;
                     Var TheIcon : HIcon;
                     Var TitleCol,TxCol,BkCol : TColorRef); Export;

Begin
  StrCopy(Str1,'Lines V');
  StrCat(Str1,MasterVer);
  StrCopy(Str2,'A Random Line Drawer'#13'Copyright © 1992-1996'#13'by clySmic Software');

  TheIcon := LoadIcon(hInstance,'ABOUT');

  TitleCol := RGB(255,255,0);
  TxCol := RGB(0,0,128);
  BkCol := RGB(0,128,0);
End {AddInAbout};

{-----------------------------------------------}

{ --- Clysbar queries Add-In whether it'll accept d'n'd --- }

Function AddInAcceptDrops : Boolean; Export;

Begin
  AddInAcceptDrops := False;
End {AddInAcceptDrops};

{-----------------------------------------------}

{ --- Clysbar informs Add-In of a d'n'd drop --- }

Procedure AddInDrop(hDrop : THandle); Export;

Begin
End {AddInDrop};

{-----------------------------------------------}

{ --- Clysbar queries Add-In for Info Window text --- }

{ Return a zero-length string if you don't want to chg the text }

Procedure AddInGetInfoWinTx(Tx : PChar); Export;

Begin
  StrCopy(Tx,'');
End {AddInGetInfoWinTx};

{-----------------------------------------------}

Exports AddInInit         Index 1,
        AddInPaint        Index 2,
        AddInTimerNeeded  Index 3,
        AddInTimerTick    Index 4,
        AddInPressed      Index 5,
        AddInExit         Index 6,
        AddInAbout        Index 7,
        AddInAcceptDrops  Index 8,
        AddInDrop         Index 9,
        AddInGetInfoWinTx Index 10;

Begin
End.