Syntax10.Scn.Fnt
StampElems
Alloc
10 May 95
Syntax10m.Scn.Fnt
Syntax10i.Scn.Fnt
FoldElems
MODULE PopupElems;	(** MF 27.1.92 /MH/CM/MAH/HM 
IMPORT
	Modules, Oberon, Input, Display, Viewers, Files, Fonts, Printer,
	Texts, MenuViewers, TextFrames, TextPrinter, Bitmaps;
CONST
	ehm = 4; evm = 3;	(*element: horizontal margin, vertical margin*)
	mhm = 5; mvm = 2;	(*menu: horizontal margin, vertical margin*)
	CR = 0DX;
	DUnit = TextFrames.Unit; PUnit = TextPrinter.Unit;
	MR = 0; MM = 1; ML = 2; cancel = {ML, MM, MR};
	white = 0; grey1 = 12; grey2 = 13; grey3 = 14; black = 15;
	Elem* = POINTER TO ElemDesc;
	ElemDesc* = RECORD(Texts.ElemDesc)
		name*: ARRAY 32 OF CHAR;
		menu*: Texts.Text;
		small*: BOOLEAN;	(** TRUE if elem displays itself small *)
		beg, end: LONGINT;	(*displayed text stretch in menu*)
		n, def: INTEGER;	(* number of items, default item*)
		wid, lsp, dsc: INTEGER	(*width, line space, descender of item lines*)
	END;
	EditFrame = POINTER TO EditFrameDesc;
	EditFrameDesc = RECORD (TextFrames.FrameDesc)
		elem: Elem
	END;
	ExecMsg* = RECORD (Texts.ElemMsg)
		frame*: Display.Frame;
		pos*: LONGINT;
		keys*: SET
	END;
	elemPressed: BOOLEAN;  (*TRUE if popup elem should be drawn in pressed mode*)
	buf: Texts.Buffer;	(* copy buffer *)
	Wr: Texts.Writer;
(* auxiliary *)
PROCEDURE Min (x, y: INTEGER): INTEGER;	
BEGIN IF x<y THEN RETURN x ELSE RETURN y END
END Min;
PROCEDURE Max (x, y: INTEGER): INTEGER;	
BEGIN IF x>y THEN RETURN x ELSE RETURN y END
END Max;
PROCEDURE CopyText (T: Texts.Text): Texts.Text;	
	VAR t: Texts.Text; buf: Texts.Buffer; (*Save destroys the global buf*)
BEGIN
	NEW(buf); Texts.OpenBuf(buf); Texts.Save(T, 0, T.len, buf);
	t := TextFrames.Text(""); Texts.Append(t, buf); RETURN t
END CopyText;
PROCEDURE SetDefaultMenu (E: Elem); 
BEGIN
	Texts.WriteString(Wr, "right interclick to edit menu");
	Texts.WriteLn(Wr); Texts.WriteLn(Wr); Texts.Append(E.menu, Wr.buf)
END SetDefaultMenu;
PROCEDURE Set (VAR r: Texts.Reader; t: Texts.Text; pos: LONGINT; line: INTEGER);	
	VAR i: INTEGER; ch: CHAR;
BEGIN
	Texts.OpenReader(r, t, pos);
	FOR i := 0 TO line-1 DO
		REPEAT Texts.Read(r, ch) UNTIL ch = CR
END Set;
PROCEDURE Restore (e: Elem);	
	VAR t: Texts.Text; pos: LONGINT;
BEGIN
	t := Texts.ElemBase(e); pos := Texts.ElemPos(e);
	t.notify(t, Texts.replace, pos, pos+1)
END Restore;
(* metrics *)
PROCEDURE MeasureElem (E: Elem; fnt: Fonts.Font);	
	VAR i, wid, dx, x, y, w, h: INTEGER; p: LONGINT;
BEGIN
	IF E.small THEN E.H := LONG(TextFrames.menuH-1)*DUnit
	ELSE E.H := LONG(fnt.maxY-fnt.minY+2*evm)*DUnit
	END;
	wid := 2*ehm; i := 0;
	WHILE E.name[i] # 0X DO Display.GetChar(fnt.raster, E.name[i], dx, x, y, w, h, p); INC(wid, dx); INC(i) END;
	E.W := LONG(wid)*DUnit
END MeasureElem;
PROCEDURE MeasureMenu* (E: Elem);	
	(*compute E.n, E.def, E.wid, E.lsp, E.dsc*)
	VAR r: Texts.Reader; ch, oldCh: CHAR; wid, dx, x, y, w, h: INTEGER; p: LONGINT;
BEGIN
	IF E.menu.len = 0 THEN SetDefaultMenu(E) END;
	E.wid := 0; E.n := 1; E.lsp := 0; wid := 0; oldCh := 0X; E.def := -1;
	Texts.OpenReader(r, E.menu, 0); Texts.Read(r, ch);
	WHILE ~r.eot DO
		IF ch = CR THEN E.wid := Max(E.wid, wid); wid := 0; INC(E.n)
		ELSIF r.elem # NIL THEN
			E.lsp := Max(E.lsp, SHORT(r.elem.H DIV TextFrames.Unit)); 
			INC(wid, SHORT(r.elem.W DIV TextFrames.Unit))
		ELSE
			E.lsp := Max(E.lsp, r.fnt.height); E.dsc := Min(E.dsc, r.fnt.minY);
			Display.GetChar(r.fnt.raster, ch, dx, x, y, w, h, p); INC(wid, dx)
		END;
		oldCh := ch; Texts.Read(r, ch)
	END;
	IF oldCh = CR THEN DEC(E.n) END;
	E.wid := Max(E.wid, wid); INC(E.lsp)
END MeasureMenu;
(* interactive editing of popup menus *)
PROCEDURE HandleEdit (F: Display.Frame; VAR M: Display.FrameMsg);	
	VAR F1: EditFrame;
BEGIN
	TextFrames.Handle(F, M);
	WITH F: EditFrame DO
		IF M IS Oberon.CopyMsg THEN
			NEW(F1);
			TextFrames.Open(F1, F.text, F.org);
			F1.handle := F.handle; F1.elem := F.elem; M(Oberon.CopyMsg).F := F1
		END
END HandleEdit;
PROCEDURE OpenEditor (E: Elem);	
	VAR V: Viewers.Viewer; F: EditFrame; x, y, i: INTEGER; name: ARRAY 34 OF CHAR;
BEGIN
	name[0] := 22X; i := 0;	(* 22X = " *)
	WHILE E.name[i] # 0X DO name[i+1] := E.name[i]; INC(i) END;
	name[i+1] := 22X; name[i+2] := 0X;
	Oberon.AllocateUserViewer(Oberon.Mouse.X, x, y);
	NEW(F); F.elem := E; TextFrames.Open(F, CopyText(E.menu), 0); F.handle := HandleEdit;
	V := MenuViewers.New(TextFrames.NewMenu(name,
			"System.Close  System.Copy  System.Grow  PopupElems.Toggle  PopupElems.Update "),
			F, TextFrames.menuH, x, y)
END OpenEditor;
(* file input/output *)
PROCEDURE Load (VAR R: Files.Rider; E: Elem);	
	CONST VersionTag = 01X; menuElem = 0; 
	VAR ch: CHAR; val: LONGINT; options: SET;
BEGIN
	Files.Read (R, ch);
	IF ch = VersionTag THEN
		Files.ReadString (R, E.name);
		Files.ReadNum (R, val);
		Files.ReadSet (R, options);
		IF menuElem IN options THEN E.small:=TRUE ELSE E.small:=FALSE END;
	ELSE
		Files.Set (R, Files.Base (R), Files.Pos (R)-1);
		Files.ReadString(R, E.name); 
		Files.ReadBool(R, E.small)
	END;
	E.menu := TextFrames.Text(""); Texts.Load(R, E.menu)
END Load
PROCEDURE Store (VAR R: Files.Rider; E: Elem);	
	VAR ch: CHAR;
BEGIN
	Files.WriteString(R, E.name);
	Files.WriteBool(R,E.small);
	Texts.Store(R, E.menu)
END Store;
(* graphics *)
PROCEDURE PrintElem (E: Elem; X, Y: INTEGER; fnt: Fonts.Font);	
	VAR W, H: INTEGER;
BEGIN W:=SHORT((E.W-1) DIV PUnit); H:=SHORT(E.H DIV PUnit);
	IF E.small THEN Printer.String(X, Y, E.name, fnt.name); Printer.ReplPattern(X, Y-2, W, 1, 2)
	ELSE
		INC (W, 2 * ehm * DUnit DIV PUnit);
		Printer.ReplConst(X, Y, W, 2);
		Printer.ReplConst(X, Y+H-2, W, 2);
		Printer.ReplConst(X, Y+2, 2, H-4);
		Printer.ReplConst(X+W-2, Y+2, 2, H-4);
		Printer.String(X + ehm * DUnit DIV PUnit, Y + SHORT(LONG(evm-fnt.minY)*DUnit DIV PUnit),
			E.name, fnt.name)
END PrintElem;
PROCEDURE DrawBigElem (pressed: BOOLEAN; X, Y, W, H: INTEGER);	
BEGIN
	IF pressed THEN
		Display.ReplConst(grey1, X, Y, W, H, Display.replace);
		Display.ReplConst(grey3, X, Y+2, W-2, H-2, Display.replace);
		Display.ReplConst(grey2, X+2, Y+2, W-4, H-4, Display.replace);
		Display.Dot(grey3, X, Y+1, Display.replace);
		Display.Dot(grey3, X+W-2, Y+H-1, Display.replace);
	ELSE
		Display.ReplConst(grey3, X, Y, W, H, Display.replace);
		Display.ReplConst(grey1, X, Y+2, W-2, H-2, Display.replace);
		Display.ReplConst(grey2, X+2, Y+2, W-4, H-4, Display.replace);
		Display.Dot(grey1, X, Y+1, Display.replace);
		Display.Dot(grey1, X+W-2, Y+H-1, Display.replace);
END DrawBigElem;
PROCEDURE DrawSmallElem (pressed: BOOLEAN; X, Y, W, H: INTEGER);	
BEGIN
	IF pressed THEN
		Display.ReplConst(white, X, Y, W, H, Display.replace);
		Display.ReplConst(grey3, X, Y+1, W-1, H-1, Display.replace);
		Display.ReplConst(grey2, X+1, Y+1, W-2, H-2, Display.replace)
	ELSE
		Display.ReplConst(black, X, Y, W, H, Display.replace);
		Display.ReplConst(grey3, X, Y+1, W-1, H-1, Display.replace);
		Display.ReplConst(grey2, X, Y+2, W-2, H-2, Display.replace);
		Display.ReplConst(white, X, Y+1, 1, H-1, Display.replace);
		Display.ReplConst(white, X, Y+H-1, W-1, 1, Display.replace)
END DrawSmallElem;
PROCEDURE DrawElem (E: Elem; col: SHORTINT; X, Y: INTEGER; fnt: Fonts.Font);	
	VAR W, H: INTEGER; i, x, y, w, h, dx: INTEGER; pat: Display.Pattern;
BEGIN
	W := SHORT(E.W DIV DUnit); H := SHORT(E.H DIV DUnit);
	IF E.small THEN DrawSmallElem(elemPressed, X, Y, W, H); INC(Y, 3)
	ELSE DrawBigElem(elemPressed, X, Y, W, H); INC(Y, evm-fnt.minY)
	END;
	INC(X, ehm); i := 0;
	WHILE E.name[i] # 0X DO
		Display.GetChar(fnt.raster, E.name[i], dx, x, y, w, h, pat);
		Display.CopyPattern(col, pat, X+x, Y+y, Display.paint); INC(X, dx); INC(i)
END DrawElem;
PROCEDURE DrawLine (VAR r: Texts.Reader; f: Display.Frame; X, Y: INTEGER);	
	VAR e: Texts.Elem; ch: CHAR; dx, x, y, w, h: INTEGER; pat: Display.Pattern;
		m: TextFrames.DisplayMsg;
BEGIN
	LOOP Texts.Read(r, ch);
		IF r.eot OR (ch = CR) THEN EXIT
		ELSIF r.elem # NIL THEN
			e := r.elem; y := r.fnt.minY;
			m.prepare := FALSE; m.fnt := r.fnt; m.col := r.col; m.pos := Texts.Pos(r) - 1;
			m.frame := f; m.X0 := X; m.Y0 := Y+y; m.elemFrame := NIL;
			e.handle(e, m); INC(X, SHORT(e.W DIV TextFrames.Unit))
		ELSE
			Display.GetChar (r.fnt.raster, ch, dx, x, y, w, h, pat);
			Display.CopyPattern(r.col, pat, X+x, Y+y, Display.paint); INC(X, dx)
		END
END DrawLine;
PROCEDURE DrawMenu(E: Elem; F: Display.Frame; X, Y, W, H: INTEGER);	
	VAR R: Texts.Reader; X0, bot: INTEGER;
BEGIN
	IF E.n > 1 THEN
		Display.ReplConst(black, X, Y, W, H, Display.replace);
		Display.ReplConst(grey2, X+1, Y+1, W-2, H-2, Display.replace);
		E.beg := 0; bot := Y + mvm - E.dsc;
		X0 := X + mhm; X := X0; Y := Y + H - mvm - E.lsp - E.dsc;
		Texts.OpenReader(R, E.menu, 0);
		WHILE ~R.eot & (Y >= bot) DO
			DrawLine(R, F, X, Y); Y := Y - E.lsp; X := X0
		END;
		E.end := Texts.Pos(R);
END DrawMenu;
(* actions *)
PROCEDURE ExecCmd (E: Elem; F: Display.Frame; pos: LONGINT; keys: SET);	
	VAR s: Texts.Scanner; par: Oberon.ParList; res, i, j: INTEGER; ch: CHAR; m: TextFrames.TrackMsg;
BEGIN
	Texts.OpenScanner(s, E.menu, pos); Texts.Scan(s);
	IF (s.class = Texts.Name) & (s.line = 0) THEN
		i := 0; WHILE (i < s.len) & (s.s[i] # ".") DO INC(i) END;
		j := i + 1; WHILE (j < s.len) & (s.s[j] # ".") DO INC(j) END;
		IF (j >= s.len) & (s.s[i] = ".") THEN
			NEW(par); par.frame := F; par.vwr := Viewers.This(F.X, F.Y); par.text := E.menu; par.pos := Texts.Pos(s)-1;
			Oberon.Call(s.s, par, ML IN keys, res);	(* left interclick -> unload module *)
			IF res > 0 THEN
				Texts.WriteString(Wr, "Call error: "); Texts.WriteString(Wr, Modules.importing);
				IF (res = 1) OR (res = 5) THEN Texts.WriteString(Wr, " not found")
				ELSIF res = 2 THEN Texts.WriteString(Wr, " not an obj-file")
				ELSIF res = 3 THEN Texts.WriteString(Wr, " imports ");
					Texts.WriteString(Wr, Modules.imported); Texts.WriteString(Wr, " with bad key")
				ELSIF res = 4 THEN Texts.WriteString(Wr, " not enough memory")
				ELSIF res = 5 THEN Texts.WriteString(Wr, " module not found")
				ELSIF res = 6 THEN Texts.WriteString(Wr, " command not found")
				ELSE Texts.WriteString(Wr, " res = "); Texts.WriteInt(Wr, res, 0)
				END
			ELSIF res < 0 THEN
				INC(i); WHILE i < s.len DO Texts.Write(Wr, s.s[i]); INC(i) END;
				Texts.WriteString(Wr, " not found")
			END;
			IF res # 0 THEN Texts.WriteLn(Wr); Texts.Append(Oberon.Log, Wr.buf) END
		END
	ELSIF (s.class = Texts.Char) & (s.c = Texts.ElemChar) & (s.line = 0) THEN
		Texts.OpenReader(s, E.menu, pos); Texts.Read(s, ch);
		m.frame := NIL; m.keys := {MM}; s.elem.handle(s.elem, m)
END ExecCmd;
PROCEDURE SelectMenu (E: Elem; F: Display.Frame; X, Y, W, H, ex, ey, ew, eh: INTEGER; VAR cmd: INTEGER; VAR keysum: SET);	
	VAR mx, my, top, bot, left, right, newCmd: INTEGER; keys: SET; B: Bitmaps.Bitmap;
	PROCEDURE TrackMouse (VAR x, y: INTEGER; VAR keys, keysum: SET);	
	BEGIN
		Input.Mouse(keys, x, y); keysum := keysum+keys;
		Oberon.DrawCursor(Oberon.Mouse, Oberon.Arrow, x, y)
	END TrackMouse;
	PROCEDURE Flip (in: BOOLEAN; cmd: INTEGER);	
		VAR R: Texts.Reader; x, y, w, h, X0, Y0: INTEGER;
	BEGIN
		IF (E.n>1) & (cmd >= 0) THEN
			X0 := X+mhm; Y0 := Y+H-(E.lsp*(cmd+1))-E.dsc-mvm;
			x := left; y := Y0 + E.dsc - 1; w := right - left + 1; h := E.lsp + 2;
			IF in THEN
				Display.ReplConst(black, x, y, w, 1, Display.replace);
				Display.ReplConst(black, x+w-1, y, 1, h-1, Display.replace);
				Display.ReplConst(white, x, y+1, 1, h-1, Display.replace);
				Display.ReplConst(white, x, y+h-1, w, 1, Display.replace);
				Display.ReplConst(grey1, x+1, y+1, w-2, h-2, Display.replace)
			ELSE
				Display.ReplConst(grey2, x, y, w, h, Display.replace)
			END;
			Set(R, E.menu, E.beg, cmd); DrawLine(R, F, X0, Y0)
		END
	END Flip;
	PROCEDURE BwdLine (VAR pos: LONGINT);	
		VAR r: Texts.Reader; ch: CHAR;
	BEGIN
		DEC(pos);
		REPEAT
			DEC(pos); Texts.OpenReader(r, E.menu, pos); Texts.Read(r, ch)
		UNTIL (pos = 0) OR (ch = CR);
		IF ch = CR THEN INC(pos) END
	END BwdLine;
	PROCEDURE FwdLine (VAR pos: LONGINT);	
		VAR r: Texts.Reader; ch: CHAR;
	BEGIN
		Texts.OpenReader(r, E.menu, pos);
		REPEAT Texts.Read(r, ch) UNTIL r.eot OR (ch = CR);
		pos := Texts.Pos(r);
	END FwdLine;
	PROCEDURE ScrollUp;	
		VAR cmd: INTEGER;
	BEGIN
		cmd := H DIV E.lsp - 1; Flip(FALSE, cmd);
		Display.CopyBlock(left, bot, W-2, H-2*mvm-E.lsp, left, bot+E.lsp, Display.replace);
		FwdLine(E.beg); FwdLine(E.end); Flip(FALSE, cmd)
	END ScrollUp;
	PROCEDURE ScrollDown;	
	BEGIN
		Flip(FALSE, 0);
		Display.CopyBlock(left, bot+E.lsp, W-2, H-2*mvm-E.lsp, left, bot, Display.replace);
		BwdLine(E.beg); BwdLine(E.end); Flip(FALSE, 0)
	END ScrollDown;
BEGIN
	left:=X+1; right:=X+W-2; bot:=Y+mvm; top:=Y+H-mvm;
	Oberon.RemoveMarks(X, Y, W, H); Oberon.FadeCursor(Oberon.Mouse);
	B := Bitmaps.New(W, H); Bitmaps.CopyBlock(Bitmaps.Disp, B, X, Y, W, H, 0, 0, 0);
	DrawMenu(E, F, X, Y, W, H);
	Flip(TRUE, cmd);
	keysum := {}; newCmd := -1;
	REPEAT
		TrackMouse(mx, my, keys, keysum);
		IF keysum = cancel THEN cmd := -1
		ELSIF (mx >= left) & (mx <= right) THEN
			WHILE (my <= bot) & (E.end < E.menu.len) & (keys # {}) DO ScrollUp; TrackMouse(mx, my, keys, keysum) END;
			WHILE (my >= top) & (E.beg > 0) & (keys # {}) DO ScrollDown; TrackMouse(mx, my, keys, keysum) END;
			IF (my > bot) & (my <= top) THEN
				newCmd:=(top-my) DIV E.lsp;
				IF newCmd # cmd THEN
					Flip(FALSE, cmd); Flip(TRUE, newCmd); cmd:=newCmd
				END
			ELSIF (mx < ex) OR (mx >= ex+ew) OR (my < ey) OR (my >= ey+eh) OR (newCmd >= 0) THEN
				Flip(FALSE, cmd); cmd := -1
			END
		ELSIF (mx < ex) OR (mx >= ex+ew) OR (my < ey) OR (my >= ey+eh) OR (newCmd >= 0) THEN
			Flip(FALSE, cmd); cmd := -1
		END
	UNTIL keys = {};
	Oberon.FadeCursor(Oberon.Mouse);
	Bitmaps.CopyBlock(B, Bitmaps.Disp, 0, 0, W, H, X, Y, 0)
END SelectMenu;
PROCEDURE Popup (E: Elem; col: SHORTINT; X, Y: INTEGER; fnt: Fonts.Font; F: Display.Frame);	
	VAR W, H, menuX, menuY, menuW, menuH, cmd, i: INTEGER; pos: LONGINT;
		r: Texts.Reader; keys: SET; draw: TextFrames.DisplayMsg; exec: ExecMsg;
BEGIN
	draw.prepare := FALSE; draw.fnt := fnt; draw.col := col; draw.frame := F;
	draw.X0 := X; draw.Y0 := Y;
	W := SHORT(E.W DIV DUnit); H := SHORT(E.H DIV DUnit);
	menuW := E.wid + 2*mhm; menuH := E.n*E.lsp + 2*mvm;
	IF Y - menuH >= 0 THEN menuY := Y - menuH
	ELSIF Y + H + menuH <= Display.Height THEN menuY := Y + H
	ELSE menuY := 0
	END;
	IF X + menuW <= Display.Width THEN menuX := X
	ELSE menuX := Max(X + W - menuW, 0)
	END;
	i := Display.Height - 2*mvm;
	IF menuH > i THEN menuH := i DIV E.lsp * E.lsp + 2*mvm END;
	cmd := Max(E.def, 0);
	elemPressed := TRUE; E.handle(E, draw);
	SelectMenu(E, F, menuX, menuY, menuW, menuH, X, Y, W, H, cmd, keys);
	elemPressed := FALSE; E.handle(E, draw);
	IF keys = {MM, MR} THEN OpenEditor(E)
	ELSIF (keys # cancel) & (cmd > -1) THEN
		E.def := cmd;
		Set(r, E.menu, E.beg, cmd);
		exec.frame := F; exec.pos := Texts.Pos(r); exec.keys := keys; E.handle(E, exec)
END Popup;
(* element *)
PROCEDURE Handle* (E: Texts.Elem; VAR msg: Texts.ElemMsg);	
	VAR e: Elem;
BEGIN
	WITH E: Elem DO
		WITH
		  msg: TextFrames.DisplayMsg DO
			IF msg.prepare THEN MeasureElem(E, msg.fnt)
			ELSE DrawElem(E, msg.col, msg.X0, msg.Y0, msg.fnt)
			END
		| msg:TextPrinter.PrintMsg DO
			IF ~msg.prepare THEN PrintElem(E, msg.X0, msg.Y0, msg.fnt) END
		| msg:Texts.CopyMsg DO
			IF msg.e = NIL THEN NEW(e); msg.e := e ELSE e := msg.e(Elem) END;
			Texts.CopyElem(E, e);
			e.name:=E.name; e.n := E.n; e.wid:=E.wid; e.lsp:=E.lsp; e.dsc:=E.dsc; 
			e.small := E.small; e.def := E.def;
			e.menu:=TextFrames.Text(""); Texts.Save(E.menu, 0, E.menu.len, buf); 
			Texts.Append(e.menu, buf)
		| msg:Texts.IdentifyMsg DO
			msg.mod:="PopupElems"; msg.proc:="Alloc"
		| msg:Texts.FileMsg DO
			IF msg.id=Texts.load THEN Load(msg.r, E); MeasureMenu(E)
			ELSIF msg.id=Texts.store THEN Store(msg.r, E)
			END
		| msg:TextFrames.TrackMsg DO
			IF msg.keys = {MM} THEN
				Popup(E, msg.col, msg.X0, msg.Y0, msg.fnt, msg.frame); msg.keys := {}
			END
		| msg: ExecMsg DO ExecCmd(E, msg.frame, msg.pos, msg.keys)
		ELSE
		END
END Handle;
PROCEDURE Alloc*;	
	VAR E: Elem;
BEGIN NEW(E); E.handle:=Handle; Texts.new:=E
END Alloc;
PROCEDURE Insert0 (small: BOOLEAN);	
	VAR E: Elem; S: Texts.Scanner; insert: TextFrames.InsertElemMsg;
BEGIN
	NEW(E); Texts.OpenScanner(S, Oberon.Par.text, Oberon.Par.pos); Texts.Scan(S);
	IF ~(S.class IN {Texts.Name, Texts.String}) THEN S.s := "Popup" END;
	COPY(S.s, E.name); E.small := small;
	E.menu := TextFrames.Text(""); SetDefaultMenu(E);
	MeasureMenu(E); E.handle := Handle;
	insert.e := E; Viewers.Broadcast(insert)
END Insert0;
PROCEDURE Insert*;	
BEGIN Insert0(FALSE)
END Insert;
PROCEDURE InsertMenu*;	
BEGIN Insert0(TRUE)
END InsertMenu;
PROCEDURE Toggle*;	
	VAR text: Texts.Text; E: Elem; pos: LONGINT;
BEGIN
	IF Oberon.Par.frame = Oberon.Par.vwr.dsc THEN
		E := Oberon.Par.frame.next(EditFrame).elem; E.small := ~E.small;
		Restore(E)
END Toggle;
PROCEDURE Update*;	
	VAR F: EditFrame; S: Texts.Scanner; menuText, text: Texts.Text; E: Elem; pos: LONGINT;
BEGIN
	IF Oberon.Par.frame = Oberon.Par.vwr.dsc THEN
		F := Oberon.Par.frame.next(EditFrame); E := F.elem;
		menuText := Oberon.Par.frame(TextFrames.Frame).text;
		Texts.OpenScanner(S, menuText, 0); Texts.Scan(S);
		IF ~(S.class IN {Texts.Name, Texts.String}) THEN S.s := "Popup" END;
		COPY(S.s, E.name); E.menu := CopyText(F.text);
		MeasureMenu(E); Restore(E);
		Texts.OpenReader(S, menuText, menuText.len-1); Texts.Read(S, S.c);
		IF S.c = "!" THEN Texts.Delete(menuText, menuText.len-1, menuText.len) END
END Update;
BEGIN
	elemPressed := FALSE;
	NEW(buf); Texts.OpenBuf(buf); Texts.OpenWriter(Wr)
END PopupElems.