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Books.Mod
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Books.Mod
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(* OBERON System 3, Release 2.3.
Copyright 1999 ETH Zürich Institute for Computer Systems,
ETH Center, CH-8092 Zürich. e-mail: oberon@inf.ethz.ch.
This module may be used under the conditions of the general Oberon
System 3 license contract. The full text can be downloaded from
"ftp://ftp.inf.ethz.ch/pub/software/Oberon/System3/license.txt;A"
Under the license terms stated it is in particular (a) prohibited to modify
the interface of this module in any way that disagrees with the style
or content of the system and (b) requested to provide all conversions
of the source code to another platform with the name OBERON. *)
MODULE Books; (** portable *) (* ejz, further hacked by jm *)
IMPORT Books0, Panels, Objects, Documents, Gadgets, Display, Display3, TextGadgets, TextGadgets0, BasicGadgets,
Texts, Fonts, Oberon, Modules, Desktops, Effects;
CONST
(* some other special characters *)
EOL* = 0DX; Tab* = 09X; quote* = CHR(34);
(* constants used by Texts.ChangeLooks *)
looksLib* = 0; looksCol* = 1;
(* limit for chapter nesting *)
maxSect* = 4;
(* colors for special text *)
linkCol* = 3 (*Display3.blue*); callCol* = 1(*Display3.red*); noteCol* = 8;
(* more modes for Books0.Frame *)
link* = 1; call* = 2; note* = 3;
(* options for Panel *)
formated* = 0; resize* = 1; icon* = 2; usesnotes* = 3; formatText* = 4; twoRow*= 5;
invalid* = 15; left* = 16; middle* = 17; right* = 18; pad* = 19;
(* constants used to draw a tutorial *)
border* = 4;
borderL* = 1; borderR* = 0;
borderT* = 0; borderB* = 1;
barH* = 4;
buttonW* = 50; buttonH* = 20;
scrollBW* = 25;
TYPE
TGFrame* = POINTER TO TGFrameDesc;
Panel* = POINTER TO PanelDesc;
Chain = POINTER TO ChainDesc;
(* extended TextGadgets.Frame: lastPos: for searching; panel: easy find the owning panel *)
TGFrameDesc* = RECORD (TextGadgets.FrameDesc)
focus: BOOLEAN;
lastPos*: LONGINT;
panel*: Panel
END;
(* extended Panels.Panel: contains all data needed for a tutorial at runtime *)
PanelDesc* = RECORD (Panels.PanelDesc)
doc*: Documents.Document;
iconStr*: ARRAY 2*Books0.nameLen OF CHAR;
texts*, cur*: Books0.TextList;
cmds*, notes*: Texts.Text;
useStack*: Chain;
imps*: Books0.ImpList;
options*: SET;
curC: Books0.ContElem;
noteH*: INTEGER
END;
(* stack of changes to a tutorial *)
ChainDesc = RECORD
old: Books0.TextList;
pos: LONGINT;
next: Chain
END;
VAR
Wr: Texts.Writer;
B: Texts.Buffer;
tmpT: Texts.Text;
(* new methods for TGFrame *)
m: TextGadgets0.Methods;
(* set to open a tutorial at any position *)
newPos*, newInd*: LONGINT;
(* retrieve Text/Note-Gadgets from a panel *)
PROCEDURE GetText*(P: Panel; VAR T: TGFrame);
VAR obj: Objects.Object;
BEGIN
T := NIL;
IF P # NIL THEN
obj := Gadgets.FindObj(P, "Text");
IF (obj # NIL) & (obj IS TGFrame) THEN
T := obj(TGFrame)
END
END
END GetText;
PROCEDURE GetNote*(P: Panel; VAR T: TGFrame);
VAR obj: Objects.Object;
BEGIN
T := NIL;
IF P # NIL THEN
obj := Gadgets.FindObj(P, "Note");
IF (obj # NIL) & (obj IS TGFrame) THEN
T := obj(TGFrame)
END
END
END GetNote;
(* resize all TextGadgets.Style to w in a tutorial (P) *)
PROCEDURE ResizeControls*(P: Panel; T: TGFrame; w: INTEGER);
VAR
Fi: Texts.Finder;
t: Books0.TextList;
obj: Objects.Object;
BEGIN
IF T # NIL THEN
Texts.OpenFinder(Fi, T.text, 0);
Texts.FindObj(Fi, obj);
WHILE ~Fi.eot DO
IF (obj # NIL) & (obj IS TextGadgets.Style) THEN
obj(TextGadgets.Style).width := w
END;
Texts.FindObj(Fi, obj)
END
END;
t := P.texts;
WHILE t # NIL DO
Texts.OpenFinder(Fi, t.text, 0);
Texts.FindObj(Fi, obj);
WHILE ~Fi.eot DO
IF (obj # NIL) & (obj IS TextGadgets.Style) THEN
obj(TextGadgets.Style).width := w
END;
Texts.FindObj(Fi, obj)
END;
t := t.next
END
END ResizeControls;
(* redisplay a tutorial panel *)
PROCEDURE MoveBar(P: Panel; M: Display.ModifyMsg; name: ARRAY OF CHAR; Y, mode: INTEGER; broadcast: BOOLEAN);
VAR
obj: Objects.Object;
msg: Display.ModifyMsg;
BEGIN
obj := Gadgets.FindObj(P, name);
IF obj # NIL THEN
msg.id := Display.move;
msg.mode := mode;
msg.W := M.W-borderL-borderR+1;
msg.H := obj(Books0.Bar).H;
msg.dW := 0; msg.dH := 0;
msg.dX := 0; msg.dY := 0;
msg.x := 0; msg.y := 0;
msg.X := obj(Books0.Bar).X;
msg.Y := Y;
msg.F := obj(Books0.Bar);
msg.res := -1; msg.dlink := P;
msg.stamp := M.stamp;
IF broadcast THEN
Display.Broadcast(msg)
ELSE
obj.handle(obj, msg)
END
END
END MoveBar;
PROCEDURE ReDisplay*(VAR M: Display.ModifyMsg; mode: INTEGER; broadcast: BOOLEAN);
VAR
butH: INTEGER;
T, Tn: TGFrame;
P: Panel;
msg: Display.ModifyMsg;
BEGIN
P := M.F(Panel);
GetText(P, T);
IF twoRow IN P.options THEN
butH := 2*buttonH
ELSE
butH := buttonH
END;
MoveBar(P, M, "bar1", (*M.Y*) - M.H + 1 +borderB+butH+barH+P.noteH-1, mode, broadcast);
msg.id := M.id; msg.mode := mode;
msg.dX := 0; msg.dY := 0;
msg.W := M.W-borderL-borderR+1;
msg.H := M.H-borderB-butH-barH-P.noteH-barH-barH-borderT+1;
msg.dW := M.dW; msg.dH := msg.H-T.H;
msg.X := T.X; msg.Y := T.Y-msg.dH;
msg.F := T;
msg.res := -1;
msg.x := 0; msg.y := 0;
msg.dlink := P; msg.stamp := M.stamp;
IF broadcast THEN
Display.Broadcast(msg)
ELSE
T.handle(T, msg)
END;
GetNote(P, Tn);
msg.id := M.id; msg.mode := mode;
msg.dX := 0; msg.dY := 0;
msg.W := M.W-borderL-borderR+1;
msg.H := P.noteH;
msg.Y := Tn.Y-msg.dH;
msg.dW := M.dW; msg.dH := msg.H-Tn.H;
msg.X := Tn.X; msg.Y := msg.Y-msg.dH;
msg.F := Tn;
msg.res := -1;
msg.x := 0; msg.y := 0;
msg.dlink := P; msg.stamp := M.stamp;
IF broadcast THEN
Display.Broadcast(msg)
ELSE
Tn.handle(Tn, msg)
END
END ReDisplay;
(* make a copy of a given (from) text, replace styles by new ones *)
PROCEDURE CopyText*(from: Texts.Text; VAR to: Texts.Text);
VAR
B: Texts.Buffer;
F: Texts.Finder;
obj, obj2: Objects.Object;
beg, pos: LONGINT;
C: Objects.CopyMsg;
BEGIN
IF to = NIL THEN
NEW(to); Texts.Open(to, "")
ELSE
Texts.Delete(to, 0, to.len)
END;
NEW(B); Texts.OpenBuf(B);
beg := 0;
Texts.OpenFinder(F, from, 0);
pos := F.pos;
Texts.FindObj(F, obj);
WHILE ~F.eot DO
IF obj IS TextGadgets.Style THEN
IF pos >= beg THEN
Texts.Save(from, beg, pos, B);
Texts.Append(to, B)
END;
C.id := Objects.deep;
C.obj := NIL;
Objects.Stamp(C);
obj.handle(obj, C);
obj2 := C.obj;
Books0.AppendFrame(to, obj2(Gadgets.Frame));
beg := to.len
END;
pos := F.pos;
Texts.FindObj(F, obj)
END;
Texts.Save(from, beg, from.len, B);
Texts.Append(to, B)
END CopyText;
(* definiton of the Panel extension *)
PROCEDURE *PanelHandler(F: Objects.Object; VAR M: Objects.ObjMsg);
VAR
obj: Objects.Object;
P, F0: Panel;
T, T0, Tn: TGFrame;
butH, x, y, h: INTEGER;
R: Display3.Mask;
tl, tl2: Books0.TextList;
PROCEDURE MoveButton(name: ARRAY OF CHAR; dX, dY, nH: INTEGER);
VAR msg: Display.ModifyMsg;
BEGIN
obj := Gadgets.FindObj(P, name);
IF obj # NIL THEN
msg.id := Display.move; msg.mode := Display.state;
msg.W := buttonW; msg.H := buttonH;
msg.dW := 0; msg.dH := 0;
msg.dX := 0; msg.dY := 0;
msg.x := 0; msg.y := 0;
msg.X := obj(BasicGadgets.Button).X+dX;
(*
msg.Y := obj(BasicGadgets.Button).Y-M(Display.ModifyMsg).dH+dY;
*)
WITH obj: BasicGadgets.Button DO
msg.Y := (obj.Y - (-F(Display.Frame).H + 1)) + dY + (-nH + 1)
END;
msg.F := obj(BasicGadgets.Button);
msg.res := -1; msg.dlink := P;
msg.stamp := M.stamp;
obj.handle(obj, msg)
END
END MoveButton;
BEGIN
WITH F: Panel DO
IF M IS Objects.AttrMsg THEN
WITH M: Objects.AttrMsg DO
IF M.id = Objects.get THEN
IF M.name = "Gen" THEN
M.class := Objects.String;
M.s := "Books.NewPanel";
M.res := 0
ELSE Panels.PanelHandler(F, M)
END
ELSE Panels.PanelHandler(F, M)
END
END
ELSIF M IS Objects.CopyMsg THEN
WITH M: Objects.CopyMsg DO
IF M.stamp = F.stamp THEN
M.obj := F.dlink
ELSE
NEW(F0);
F.stamp := M.stamp; F.dlink := F0;
Panels.CopyPanel(M, F, F0);
F0.iconStr := F.iconStr;
F0.cur := NIL;
F0.texts := NIL;
tl := F.texts;
WHILE tl # NIL DO
NEW(tl2);
tl2.next := NIL;
tl2.prev := F0.cur;
IF F0.cur = NIL THEN
F0.texts := tl2
ELSE
F0.cur.next := tl2
END;
F0.cur := tl2;
tl2.text := NIL;
CopyText(tl.text, tl2.text);
tl := tl.next
END;
F0.cur := F0.texts;
F0.doc := NIL;
F0.cmds := F.cmds;
F0.notes := F.notes;
F0.useStack := NIL;
F0.imps := F.imps;
F0.options := F.options;
F0.curC := NIL;
F0.noteH := F.noteH;
GetText(F, T); GetText(F0, T0);
CopyText(T.text, T0.text);
T0.panel := F0;
GetNote(F, T); GetNote(F0, T0);
CopyText(T.text, T0.text);
T0.panel := F0;
M.obj := F0
END
END
ELSIF M IS Display.FrameMsg THEN
WITH M: Display.FrameMsg DO
IF (M.F = F) OR (M.F = NIL) THEN
IF M IS Display.ModifyMsg THEN
WITH M: Display.ModifyMsg DO
P := F;
GetText(P, T);
GetNote(P, Tn);
IF (T # NIL) & (Tn # NIL) THEN
IF (twoRow IN P.options) = (M.W < (8*buttonW-2)) THEN
MoveButton("prev", 0, 0, M.H);
MoveButton("next", 0, 0, M.H);
MoveButton("cont", 0, 0, M.H);
MoveButton("ind", 0, 0, M.H);
MoveButton("old", 0, 0, M.H);
MoveButton("hist", 0, 0, M.H);
MoveButton("down", 0, 0, M.H);
MoveButton("up", 0, 0, M.H)
ELSE
IF M.W < (8*buttonW-2) THEN
INCL(P.options, twoRow)
ELSE
EXCL(P.options, twoRow)
END;
IF twoRow IN P.options THEN
DEC(P.noteH, buttonH);
MoveButton("prev", 0, buttonH, M.H);
MoveButton("next", 0, buttonH, M.H);
MoveButton("cont", 0, buttonH, M.H);
MoveButton("ind", 0, buttonH, M.H);
MoveButton("old", -4*buttonW, 0, M.H);
MoveButton("hist", -4*buttonW, 0, M.H);
MoveButton("down", -4*buttonW, 0, M.H);
MoveButton("up", -4*buttonW, 0, M.H)
ELSE
INC(P.noteH, buttonH);
MoveButton("prev", 0, -buttonH, M.H);
MoveButton("next", 0, -buttonH, M.H);
MoveButton("cont", 0, -buttonH, M.H);
MoveButton("ind", 0, -buttonH, M.H);
MoveButton("old", 4*buttonW, 0, M.H);
MoveButton("hist", 4*buttonW, 0, M.H);
MoveButton("down", 4*buttonW, 0, M.H);
MoveButton("up", 4*buttonW, 0, M.H)
END
END;
IF twoRow IN P.options THEN
butH := 2*buttonH
ELSE
butH := buttonH
END;
WHILE ((M.H-borderB-butH-barH-P.noteH-barH-barH-borderT) < 3) & (P.noteH > 3) DO
DEC(P.noteH)
END;
IF P.noteH < 3 THEN
P.noteH := 3
END;
MoveBar(P, M, "bar2", (*M.Y*) -M.H + 1+borderB+butH-1, Display.state, FALSE);
ReDisplay(M, Display.state, FALSE);
MoveBar(P, M, "bar0", (*M.Y+M.H*)-barH + 1, Display.state, FALSE);
IF resize IN P.options THEN
ResizeControls(P, T, M.W-borderL-borderR-scrollBW);
TextGadgets0.FormatFrame(T);
ResizeControls(P, Tn, M.W-borderL-borderR-scrollBW);
TextGadgets0.FormatFrame(Tn)
END;
Panels.PanelHandler(F, M)
ELSE Panels.PanelHandler(F, M)
END
END
ELSIF M IS Display.DisplayMsg THEN
WITH M: Display.DisplayMsg DO
Panels.PanelHandler(F, M);
IF M.device = Display.screen THEN
x := M.x + F.X; y := M.y + F.Y; h := F.H;
Gadgets.MakeMask(F, x, y, M.dlink, R);
Display3.ReplConst(R, Display3.white, x, y, 1, h, Display.replace)
END
END
ELSE Panels.PanelHandler(F, M)
END
ELSE Panels.PanelHandler(F, M)
END
END
ELSE Panels.PanelHandler(F, M)
END
END
END PanelHandler;
PROCEDURE NewPanel*;
VAR
F: Panel;
C: Objects.CopyMsg;
BEGIN
NEW(F);
Panels.NewPanel();
C.id := Objects.deep;
Objects.Stamp(C);
Panels.CopyPanel(C, Objects.NewObj(Panels.Panel), F);
F.texts := NIL; F.cur := NIL; F.useStack := NIL;
F.imps := NIL; F.cmds := NIL; F.notes := NIL;
F.options := {}; F.doc := NIL; F.curC := NIL;
F.handle := PanelHandler; F.noteH := 75;
F.borderW := 0;
Objects.NewObj := F
END NewPanel;
(* definiton of the TextGadget extension *)
PROCEDURE ^ShowText*(P: Panel; t: Books0.TextList; pos: LONGINT);
(* quick search on the index page *)
PROCEDURE HandleKey(F: TGFrame; M: Oberon.InputMsg);
VAR
R: Texts.Reader;
ch: CHAR;
P: Panel;
BEGIN
IF M.ch <= " " THEN
RETURN
END;
IF F.org < 8 THEN
Texts.OpenReader(R, F.text, 8)
ELSE
Texts.OpenReader(R, F.text, F.org+1)
END;
Texts.Read(R, ch);
IF ~R.eot THEN
WHILE ~R.eot & (CAP(ch) # CAP(M.ch)) DO
WHILE ~R.eot & ~((R.lib IS Fonts.Font) & (ch = EOL)) DO
Texts.Read(R, ch)
END;
IF ~R.eot THEN
Texts.Read(R, ch)
END
END;
P := M.dlink(Panel);
IF ~R.eot THEN
ShowText(P, P.cur, Texts.Pos(R))
ELSE
ShowText(P, P.cur, 0)
END
END
END HandleKey;
PROCEDURE ^Push*(P: Panel);
PROCEDURE *TextHandler(F: Objects.Object; VAR M: Objects.ObjMsg);
VAR
F0: TGFrame;
name: ARRAY 64 OF CHAR;
obj: Objects.Object;
x, y: INTEGER;
BEGIN
WITH F: TGFrame DO
IF M IS Objects.CopyMsg THEN
WITH M: Objects.CopyMsg DO
IF M.stamp = F.stamp THEN
M.obj := F.dlink
ELSE
NEW(F0);
F.stamp := M.stamp; F.dlink := F0;
TextGadgets.CopyFrame(M, F, F0);
F0.focus := FALSE;
F0.lastPos := 0;
F0.panel := NIL;
M.obj := F0
END
END
ELSIF M IS Objects.AttrMsg THEN
WITH M: Objects.AttrMsg DO
IF M.id = Objects.get THEN
IF M.name = "Gen" THEN
M.class := Objects.String;
M.s := "Books.NewText";
M.res := 0
ELSE TextGadgets.FrameHandler(F, M)
END
ELSE TextGadgets.FrameHandler(F, M)
END
END
ELSIF M IS Display.FrameMsg THEN
WITH M: Display.FrameMsg DO
IF (M.F = NIL) OR (M.F = F) THEN
IF M IS Oberon.InputMsg THEN
WITH M: Oberon.InputMsg DO
IF (M.id = Oberon.track) & Gadgets.InActiveArea(F, M) THEN
Gadgets.GetObjName(F, name);
x := M.x+F.X; y := M.y+F.Y;
IF (name = "Text") & (M.dlink(Panel).cur.next = NIL) & ~Effects.Inside(M.X, M.Y, x, y, F.left, F.H) THEN
IF ~F.focus & (M.keys = {2}) THEN
Oberon.Defocus();
F.focus := TRUE;
obj := Gadgets.FindObj(M.dlink, "bar0");
IF (obj # NIL) & (obj IS Books0.Bar) THEN
Books0.ColorBar(obj(Books0.Bar), Display3.red)
END
ELSE TextGadgets.FrameHandler(F, M)
END;
M.res := 0
ELSE TextGadgets.FrameHandler(F, M)
END
ELSIF F.focus & (M.id = Oberon.consume) THEN
HandleKey(F, M)
ELSE TextGadgets.FrameHandler(F, M);
END
END
ELSIF M IS Oberon.ControlMsg THEN
WITH M: Oberon.ControlMsg DO
IF M.id IN {Oberon.defocus, Oberon.neutralize} THEN
IF F.focus THEN
F.focus := FALSE;
obj := Gadgets.FindObj(M.dlink, "bar0");
IF (obj # NIL) & (obj IS Books0.Bar) THEN
Books0.ColorBar(obj(Books0.Bar), Display3.black)
END
END
END;
TextGadgets.FrameHandler(F, M)
END
ELSE TextGadgets.FrameHandler(F, M)
END
ELSE TextGadgets.FrameHandler(F, M)
END
END
ELSE TextGadgets.FrameHandler(F, M)
END
END
END TextHandler;
PROCEDURE NewText*(P: Panel);
VAR
obj: TextGadgets.Frame;
T: TGFrame;
C: Objects.CopyMsg;
BEGIN
TextGadgets.New();
obj := Objects.NewObj(TextGadgets.Frame);
EXCL(obj.state0, TextGadgets0.mayfocus);
EXCL(obj.state0, TextGadgets0.mayconsume);
EXCL(obj.state0, TextGadgets0.maymvchildren);
INCL(obj.state0, TextGadgets0.deepcopy);
INCL(obj.state0, TextGadgets0.locked);
INCL(obj.control, TextGadgets.nocontrol);
(* !! *)
INCL(obj.state, Gadgets.lockedcontents);
obj.do := m;
NEW(T);
C.id := Objects.deep; Objects.Stamp(C);
TextGadgets.CopyFrame(C, obj, T);
T.focus := FALSE;
T.lastPos := 0;
T.panel := P;
T.handle := TextHandler;
Objects.NewObj := T
END NewText;
(* try to retrieve a Panel in the current context *)
PROCEDURE GetPanel*(VAR P: Panel);
VAR
S: Texts.Scanner;
doc: Documents.Document;
obj: Objects.Object;
PROCEDURE SearchPanel(VAR obj: Objects.Object);
BEGIN
WHILE (obj # NIL) & ~(obj IS Panel) DO
obj := obj.dlink
END
END SearchPanel;
BEGIN
P := NIL;
Texts.OpenScanner(S, Oberon.Par.text, Oberon.Par.pos);
Texts.Scan(S);
IF (S.class = Texts.Char) & (S.c = "*") THEN
doc := Documents.MarkedDoc();
IF (doc # NIL) & (doc.dsc # NIL) & (doc.dsc IS Panel) THEN
P := doc.dsc(Panel);
RETURN
END
END;
IF (Gadgets.context # NIL) & (Gadgets.context IS Panel) THEN
P := Gadgets.context(Panel)
ELSIF Gadgets.context # NIL THEN
obj := Gadgets.context;
SearchPanel(obj);
IF obj # NIL THEN
P := obj(Panel)
END
END;
IF P = NIL THEN
IF (Oberon.Par # NIL) & (Oberon.Par.obj # NIL) & (Oberon.Par.obj IS TGFrame) THEN
P := Oberon.Par.obj(TGFrame).panel
ELSIF Documents.MarkedDoc() # NIL THEN
doc := Documents.MarkedDoc();
IF (doc # NIL) & (doc.dsc # NIL) & (doc.dsc IS Panel) THEN
P := doc.dsc(Panel)
END
ELSIF Desktops.CurDoc(Gadgets.context) # NIL THEN
doc := Desktops.CurDoc(Gadgets.context);
IF (doc # NIL) & (doc.dsc # NIL) & (doc.dsc IS Panel) THEN
P := doc.dsc(Panel)
END
END
END
END GetPanel;
(* show this tutorial (P) on page t at position pos *)
PROCEDURE ShowText*(P: Panel; t: Books0.TextList; pos: LONGINT);
VAR
T: TGFrame;
Fi: Texts.Finder;
obj: Objects.Object;
lCont: Books0.ContElem;
fPos, cPos: LONGINT;
C: Oberon.ControlMsg;
THETEXT: Texts.Text;
BEGIN
GetText(P, T);
IF T # NIL THEN
IF T.focus & (t.next # NIL) THEN
C.F := T;
C.id := Oberon.defocus;
C.dlink := P;
C.res := -1;
Objects.Stamp(C);
T.handle(T, C)
END;
IF (P.cur # t) OR (t.prev = NIL) THEN
T.org := 0;
THETEXT := T.text; NEW(T.text); Texts.Open(T.text, "");
Texts.Delete(THETEXT, 0, THETEXT.len);
IF t.prev = NIL THEN
(* special handling for contents page reqired*)
lCont := NIL;
Texts.OpenFinder(Fi, t.text, 0);
fPos := Fi.pos; cPos := -1;
Texts.FindObj(Fi, obj);
WHILE ~Fi.eot & (cPos < pos) DO
IF (obj IS Books0.ContElem) & (obj(Books0.ContElem).mode = Books0.node) THEN
cPos := fPos;
lCont := obj(Books0.ContElem)
END;
fPos := Fi.pos;
Texts.FindObj(Fi, obj)
END;
Texts.OpenFinder(Fi, t.text, cPos+1);
fPos := Fi.pos;
Texts.FindObj(Fi, obj);
IF (obj # NIL) & (obj IS Books0.Frame) THEN
Texts.Save(t.text, cPos+1, fPos+1, B);
Texts.Append(THETEXT, B);
Texts.WriteLn(Wr);
Texts.Append(THETEXT, Wr.buf)
ELSE
Texts.Save(t.text, cPos+1, fPos, B);
Texts.Append(THETEXT, B)
END;
Texts.Save(t.text, lCont.beg, lCont.end, B);
Texts.Append(THETEXT, B);
P.curC := lCont;
pos := 0
ELSE
Texts.Save(t.text, 0, t.text.len, B);
Texts.Append(THETEXT, B)
END;
T.text := THETEXT; T.trailer := NIL;
T.lastPos := 0;
P.cur := t;
IF T.trailer = NIL THEN
T.org := pos; T.car := FALSE; T.sel := FALSE; Gadgets.Update(T);
ELSE
TextGadgets0.ScrollTo(T, TextGadgets0.LinesUp(T.text, pos, 0))
END
ELSE
(*
IF pos < T.org THEN
TextGadgets0.Locate(T, pos);
TextGadgets0.RemoveCaret(T)
END;
*)
TextGadgets0.ScrollTo(T, TextGadgets0.LinesUp(T.text, pos, 0))
END
END
END ShowText;
(* get position of obj in t *)
PROCEDURE GetPos(t: Texts.Text; obj: Objects.Object): LONGINT;
VAR
Fi: Texts.Finder;
obj2: Objects.Object;
pos: LONGINT;
BEGIN
Texts.OpenFinder(Fi, t, 0);
pos := Fi.pos;
Texts.FindObj(Fi, obj2);
WHILE ~Fi.eot & (obj # obj2) DO
pos := Fi.pos;
Texts.FindObj(Fi, obj2)
END;
IF obj = obj2 THEN
RETURN pos
ELSE
RETURN 0
END
END GetPos;
(* save current state of P *)
PROCEDURE Push*(P: Panel);
VAR
c: Chain;
T: TGFrame;
PROCEDURE OnTop(pos: LONGINT): BOOLEAN;
BEGIN
RETURN (P.useStack # NIL) & (P.useStack.old = P.cur) & (P.useStack.pos = pos)
END OnTop;
BEGIN
GetText(P, T);
IF T # NIL THEN
IF P.cur = NIL THEN RETURN END;
IF (P.cur.prev = NIL) & ~OnTop(GetPos(P.cur.text, P.curC)) THEN
NEW(c);
c.old := P.cur;
IF P.curC # NIL THEN
c.pos := GetPos(P.cur.text, P.curC)
ELSE
c.pos := 0
END;
c.next := P.useStack;
P.useStack := c
ELSIF ~OnTop(T.org) THEN
NEW(c);
c.old := P.cur;
c.pos := T.org;
c.next := P.useStack;
P.useStack := c
END
END
END Push;
(* retrieve page-number of cur in P *)
PROCEDURE GetInd*(P: Panel; cur: Books0.TextList): LONGINT;
VAR
t: Books0.TextList;
ind: LONGINT;
BEGIN
ind := 0;
t := P.texts;
WHILE (t # NIL) & (t # cur) DO
INC(ind);
t := t.next
END;
RETURN ind
END GetInd;
(* go to the next/previous subchapter of the current tutorial *)
PROCEDURE ChapUp*;
VAR
P: Panel;
T: TGFrame;
Fi: Texts.Finder;
obj: Objects.Object;
pos, Ind, Pos: LONGINT;
BEGIN
GetPanel(P);
GetText(P, T);
IF T # NIL THEN
Ind := GetInd(P, P.cur);
Pos := T.org;
pos := MAX(LONGINT);
Texts.OpenFinder(Fi, P.texts.text, 0);
Texts.FindObj(Fi, obj);
WHILE ~Fi.eot DO
IF (obj # NIL) & (obj IS Books0.LocFrame) THEN
WITH obj: Books0.LocFrame DO
IF (obj.pos1 = Ind) & (obj.pos2 > Pos) & ((obj.pos2-Pos) < (pos-Pos)) THEN
pos := obj.pos2
END
END
END;
Texts.FindObj(Fi, obj)
END;
IF pos < MAX(LONGINT) THEN
Push(P);
ShowText(P, P.cur, pos)
ELSIF P.cur.next # NIL THEN
Push(P);
ShowText(P, P.cur.next, 0)
END
END
END ChapUp;
PROCEDURE ChapDown*;
VAR
P: Panel;
T: TGFrame;
Fi: Texts.Finder;
obj: Objects.Object;
pos, Ind, Pos: LONGINT;
BEGIN
GetPanel(P);
GetText(P, T);
IF T # NIL THEN
Ind := GetInd(P, P.cur);
Pos := T.org;
pos := -1;
Texts.OpenFinder(Fi, P.texts.text, 0);
Texts.FindObj(Fi, obj);
WHILE ~Fi.eot DO
IF (obj # NIL) & (obj IS Books0.LocFrame) THEN
WITH obj: Books0.LocFrame DO
IF (obj.pos1 = Ind) & (obj.pos2 < Pos) & ((Pos-obj.pos2) < (Pos-pos)) THEN
pos := obj.pos2
END
END
END;
Texts.FindObj(Fi, obj)
END;
IF pos >= 0 THEN
Push(P);
ShowText(P, P.cur, pos)
ELSIF P.cur.prev # NIL THEN
Push(P);
ShowText(P, P.cur.prev, 0)
END
END
END ChapDown;
(* save the usage-stack of P to a text (t) *)
PROCEDURE History*(P: Panel; t: Texts.Text);
VAR
cl: Chain;
R: Texts.Reader;
Fi: Texts.Finder;
ch: CHAR;
locF: Books0.LocFrame;
obj: Objects.Object;
pos, Pos, Ind: LONGINT;
BEGIN
cl := P.useStack;
WHILE cl # NIL DO
Books0.NewLoc();
locF := Objects.NewObj(Books0.LocFrame);
locF.mode := link;
locF.pos1 := GetInd(P, cl.old);
locF.pos2 := cl.pos;
Books0.InsertFrame(t, 0, locF);
IF cl.old.prev # NIL THEN
Texts.OpenReader(R, P.texts.text, 0);
Ind := GetInd(P, cl.old);
Pos := cl.pos;
pos := -1;
Texts.Read(R, ch);
WHILE ~R.eot DO
IF ~(R.lib IS Fonts.Font) THEN
Texts.OpenFinder(Fi, P.texts.text, Texts.Pos(R)-1);
Texts.FindObj(Fi, obj);
IF (obj # NIL) & (obj IS Books0.LocFrame) THEN
WITH obj: Books0.LocFrame DO
IF (obj.pos1 = Ind) & (obj.pos2 <= Pos) & ((Pos-obj.pos2) < (Pos-pos)) THEN
pos := obj.pos2
END
END
END
END;
Texts.Read(R, ch)
END;
Texts.OpenReader(R, cl.old.text, pos);
Texts.Read(R, ch);
WHILE ~R.eot & ~((R.lib IS Fonts.Font) & (ch = EOL)) DO
Texts.Read(R, ch)
END;
Texts.Save(cl.old.text, pos, Texts.Pos(R), B)
ELSE
Texts.OpenReader(R, cl.old.text, cl.pos);
Texts.Read(R, ch);
WHILE ~R.eot & ~((R.lib IS Fonts.Font) & (ch = EOL)) DO
Texts.Read(R, ch)
END;
Texts.Save(cl.old.text, cl.pos, Texts.Pos(R), B)
END;
Texts.Insert(t, 0, B);
cl := cl.next
END
END History;
(* go one step deeper in the contents-tree *)
PROCEDURE *OpenCont(F: Books0.ContElem);
VAR P: Panel;
BEGIN
IF (F.dlink # NIL) & (F.dlink IS TGFrame) THEN
P := F.dlink(TGFrame).panel;
Push(P);
ShowText(P, P.texts, GetPos(P.texts.text, F))
END
END OpenCont;
(* get the position of the line-end of the line containing pos *)
PROCEDURE EndOfLine(T: TGFrame; pos: LONGINT): LONGINT;
VAR
beg: LONGINT;
line: TextGadgets0.Line;
BEGIN
IF T.trailer = NIL THEN
RETURN pos
END;
beg := T.org;
line := T.trailer.next;
WHILE (line.next # T.trailer) & (beg <= pos) DO
INC(beg, line.len);
line := line.next
END;
IF beg > pos THEN
RETURN beg-1
ELSE
RETURN T.text.len
END
END EndOfLine;
(* show this tutorial (P) on page ind at position pos *)
PROCEDURE GotoText*(P: Panel; ind, pos: LONGINT; sel: BOOLEAN);
VAR
t: Books0.TextList;
i: INTEGER;
T: TGFrame;
BEGIN
i := 0;
t := P.texts;
WHILE (t # NIL) & (i < ind) DO
t := t.next;
INC(i)
END;
IF (t # NIL) & (i = ind) THEN
Push(P);
ShowText(P, t, pos);
IF sel THEN
GetText(P, T);
TextGadgets0.SetSelection(T, pos, EndOfLine(T, pos))
END
END
END GotoText;
(* get the index page of P *)
PROCEDURE GetIndex*(P: Panel): Books0.TextList;
VAR t: Books0.TextList;
BEGIN