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Gadgets.Mod
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Gadgets.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: [email protected].
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 Gadgets; (** portable *) (* , jm 18.1.95*)
(**The Gadgets module forms the basis of the Gadgets system. It defines the most important types, provide default message handlers and often used utility procedures. In addition, a few gadget specific messages are defined.
*)
(*
jm 9.2.93 - Attributes for abstract objects
- object name belongs intrinsically to objects
- support for non gadget frames removed
jm 10.2.93 - support for empty object names
- fixed attributes for abstract objects
jm 11.2.93 - Display.ControlMsg
- moved mask messages to Display3
jm 15.3.93 - Better creation of default clip masks
jm 16.3.93 - ReadRef bug
jm 17.3.93 - Add context to executor dlink when executing a command
jm 23.2.93 - Fixed semantics of Oberon.Par.obj & Oberon.Par.frame
jm 24.2.93 - Warning thrown out
jm 24.2.93 - Gadgets.Execute hack
jm 2.3.93 - Notes removed
jm 3.3.93 - ExecuteAttr corrected
jm 10.3.93 - fix version message
jm 11.3.93 - Call error correction
7.4.93 - Introduced editing platform code
8.4.93 - removed edit platform code
23.7.93 - fixed copy object
17.09.93 15:09:48 - Find message
06.01.94 - improved handling of UpdateMsg slightly
29.3.94 - Broadcast removed
- Fixed UpArrow macro
5.4.94 - fixed unnaming of objects in public libraries
19.4.94 - added aliasing support to Insert, removed aliasing from Attributes.Scanner
19.4.94 - Improved lookup macro
20.4.94 - added visible constant
27.5.94 - improved track highlight in track frame
29.6.94 - Added alias support to Change*
14.7.94 - added some more debug tests for invalid masks, most are deactivated now, search for debug
18.7.94 - changed object naming
3.11.94 - unchanged change of 18.7.94
7.11.94 - unchanged change of 18.7.94
8.11.94 - changed rules in IsLocked
29.11.94
- removed optimization flags from Gadgets
- removed nomove, noresize, nodelete, noselect flags from Gadgets
- renamed lockchildren to locked
30.11.94
- added lockedsize (same as noresize before)
- renamed locked to lockedcontents
6.12.94 - added GetSelection
14.12.94 - CopyObject implemented
15.12.94 - removed col from Gadgets.Frame
16.12.94 - removed selection bug
21.12.94 - When no attribute exists on Objects.AttrMsg "get", nothing is returned. Previously
an empty string was returned.
3.8.95 - load aliases from the Registry
6.12.95 - added ClipMask to Gadgets.ViewDesc (thanks ps) (changes the symbol file)
15.12.95 - CreateObject now uses Modules.resMsg
8.5.96 - fixed bug in Recursive
20.5.96 - CreateObject now understands aliases (ps - 20.5.96)
6.6.96 - changed Execute (light weight)
19.6.96 - fixed bug in new Execute
10.7.96 - added deep parameter to GetPublicObject (* ejz - 10.7.96 *)
4.8.96 - changed printer mask scaling to Printer.Frame
14.08.96 pjm - fix in UpArrowMacro for selected objects
18.2.97 - added ModifySize and Consume
*)
IMPORT
Objects, Display, Display3, Effects, Oberon, Texts, Input, Files, Modules,
Printer, Printer3, Attributes, Links, Viewers, Strings;
CONST
(** Priority message id's. *)
top* = 0; (** Move gadget to the front. *)
bottom* = 1; (** Move gadget to the back. *)
visible* = 2; (** Move gadget to the front if not completely visible. *)
(** Gadget Frame states. *)
selected* = 0; (** Selected or not. *)
lockedsize* = 2; (** Gadget prefers a fixed W, H. *)
transparent* = 4; (** Transparent or not. *)
lockedcontents* = 10; (** All direct descendants are locked. *)
left = 2; middle = 1; right = 0;
TYPE
(** Message broadcast in the display space to indicate that "obj" has changed. Normally used for updating model gadgets, although obj can be a list of gadget frames belonging to the same container. In this case all of the frames are to be displayed. This message is used by the Inspector to indicate that an attribute value has changed. *)
UpdateMsg* = RECORD (Display.FrameMsg)
obj*: Objects.Object;
END;
(** Message broadcast in the display space to indicate that the destination frame F wants to change its overlapping priority. *)
PriorityMsg* = RECORD (Display.FrameMsg)
id*: INTEGER; (** Top, bottom, visible. *)
passon*: BOOLEAN; (** Indication if a whole tree of containers should be changed in priority. *)
END;
CmdMsg* = RECORD (Objects.ObjMsg)
cmd*: ARRAY 128 OF CHAR; (* Information to be passed, command to be executed; result returned. *)
res*: INTEGER; (* result code *)
END;
(** Base type of the Model gadgets *)
Object* = POINTER TO ObjDesc;
ObjDesc* = RECORD (Objects.ObjDesc)
attr*: Attributes.Attr; (** Attribute list. Private variable. *)
link*: Links.Link; (** Link list. Private variable. *)
END;
(** Base type of the visual gadgets *)
Frame* = POINTER TO FrameDesc;
FrameDesc* = RECORD (Display.FrameDesc)
attr*: Attributes.Attr; (** Attribute list. Private variable. *)
link*: Links.Link; (** Link list. Private variable. *)
state*: SET;
mask*: Display3.Mask; (** Cached display mask. Can be NIL to indicate no/invalid mask. *)
obj*: Objects.Object; (** Model object, if any. *)
END;
(** Base type of the camera-view gadgets. *)
View* = POINTER TO ViewDesc;
ViewDesc* = RECORD (FrameDesc)
absX*, absY*: INTEGER; (** Absolute screen position at last message forward to descendants. *)
border*: INTEGER; (** Border width for clipping. *)
(** Install own clipping to display/printer mask here if view has an irregular outline. Otherwise set to NIL. *)
ClipMask*: PROCEDURE (v: View; M: Display3.Mask; ondisplay: BOOLEAN);
END;
(** Calculate a mask for gadget G positioned at X, Y in the context dlink. *)
MakeMaskHandler* = PROCEDURE (G: Frame; X, Y: INTEGER; dlink: Objects.Object; VAR M: Display3.Mask);
RecursiveMsg = RECORD (Display.FrameMsg) END;
Stack = RECORD
Mdlink, Fdlink: Objects.Object;
absX, absY: INTEGER;
END;
CONST
nameLen = 32; valueLen = 64;
TYPE
Alias = POINTER TO AliasDesc;
AliasDesc = RECORD
name: ARRAY nameLen OF CHAR;
value: ARRAY valueLen OF CHAR;
next: Alias;
END;
VAR
framehandle*: Objects.Handler; (** Default message handler for visual gadgets. *)
objecthandle*: Objects.Handler; (** Default message handler for Model gadgets. *)
MakeMask*: MakeMaskHandler; (** Calculates the current display mask of a visual gadget. *)
MakePrinterMask*: MakeMaskHandler; (** Calculates the current printer mask of a visual gadget. *)
(** The following fields are used for parameter transfer during command execution. *)
context*: Objects.Object; (** Context/parent of a gadget executing the command *)
executorObj*: Objects.Object; (** Gadget executing the command. Same as Oberon.Par.obj. *)
senderObj*: Objects.Object; (** Initiator of a drag and drop operation i.e. the gadget being dropped. *)
receiverObj*: Objects.Object; (** Receiver of a dropped gadget. Often same as executorObj. *)
aliases: Alias;
par: Oberon.ParList;
emptyText: Texts.Text;
W, WW, mW: Texts.Writer;
recurse, uparrowdone, verbose: BOOLEAN;
pMask: Display3.Mask; tmpX, tmpY: INTEGER;
(* Misc *)
PROCEDURE Log;
BEGIN Texts.Append(Oberon.Log, W.buf); END Log;
PROCEDURE Push(VAR S: Stack; F: View; VAR M: Display.FrameMsg);
BEGIN
(* save old variables *)
S.Fdlink := F.dlink; S.Mdlink := M.dlink; S.absX := F.absX; S.absY := F.absY;
F.dlink := M.dlink; M.dlink := F
END Push;
PROCEDURE Pop(VAR S: Stack; F: View; VAR M: Display.FrameMsg);
BEGIN
M.dlink := S.Mdlink; F.dlink := S.Fdlink; F.absX := S.absX; F.absY := S.absY
END Pop;
(* general purpose *)
(** Is the context/parent of the frame F locked ? *)
PROCEDURE IsLocked*(F: Frame; dlink: Objects.Object): BOOLEAN;
VAR A: Objects.AttrMsg;
BEGIN
IF dlink # NIL THEN
IF dlink IS Frame THEN RETURN lockedcontents IN dlink(Frame).state
ELSIF dlink.handle # NIL THEN (* not a frame *)
A.id := Objects.get; A.name := "Locked"; A.res := -1; dlink.handle(dlink, A);
RETURN (A.res >= 0) & (A.class = Objects.Bool) & A.b
ELSE RETURN FALSE
END
ELSE RETURN FALSE
END
END IsLocked;
(** Is the mouse located inside the work area of a gadget (i.e. excluding the control areas)? *)
PROCEDURE InActiveArea*(F: Frame; VAR M: Oberon.InputMsg): BOOLEAN;
VAR x, y, w, h: INTEGER;
BEGIN
x := M.x + F.X; y := M.y + F.Y; w := F.W; h := F.H;
IF Effects.Inside(M.X, M.Y, x, y, w, h) & ~(selected IN F.state) THEN
IF IsLocked(F, M.dlink) THEN RETURN TRUE
ELSIF Effects.InBorder(M.X, M.Y, x, y, w, h) THEN RETURN FALSE
ELSE RETURN TRUE
END
ELSE RETURN FALSE
END
END InActiveArea;
(** Returns the name of of obj. Sends an Objects.AttrMsg behind the scenes. *)
PROCEDURE GetObjName*(obj: Objects.Object; VAR name: ARRAY OF CHAR);
VAR A: Objects.AttrMsg;
BEGIN
name[0] := 0X;
A.id := Objects.get; A.name := "Name"; A.res := -1; A.s[0] := 0X;
obj.handle(obj, A);
IF (A.res >= 0) & (A.class = Objects.String) THEN name := A.s END
END GetObjName;
(** Name object obj. Sends an Objects.AttrMsg behind the scenes. *)
PROCEDURE NameObj*(obj: Objects.Object; IN name: ARRAY OF CHAR);
VAR A: Objects.AttrMsg;
BEGIN
A.id := Objects.set; A.name := "Name"; Objects.Stamp(A); A.class := Objects.String; A.res := -1; A.s := name;
obj.handle(obj, A);
END NameObj;
(** Search for the object "O" in the public library "L.Lib" wherename is specified as "L.O". *)
PROCEDURE FindPublicObj*(IN name: ARRAY OF CHAR): Objects.Object; (* Lib.obj format, assumes .Lib extension *)
VAR obj: Objects.Object; libname, objname: ARRAY 64 OF CHAR; i, j, k, ref: INTEGER; lib: Objects.Library;
BEGIN
obj := NIL; i := 0; j := 0;
WHILE (name[i] # ".") & (name[i] # 0X) DO libname[j] := name[i]; INC(j); INC(i); END;
IF name[i] = 0X THEN RETURN NIL END;
libname[j] := 0X; k := j; INC(i); j := 0;
WHILE (name[i] # " ") & (name[i] # 0X) DO objname[j] := name[i]; INC(j); INC(i); END;
objname[j] := 0X;
libname[k] := "."; libname[k+1] := "L"; libname[k+2] := "i"; libname[k+3] := "b"; libname[k+4] := 0X;
lib := Objects.ThisLibrary(libname);
IF lib # NIL THEN
Objects.GetRef(lib.dict, objname, ref);
IF ref # MIN(INTEGER) THEN lib.GetObj(lib, ref, obj); END
END;
RETURN obj;
END FindPublicObj;
(** Search for object named name in context. *)
PROCEDURE FindObj*(context: Objects.Object; IN name: ARRAY OF CHAR): Objects.Object;
VAR obj: Objects.Object; M: Objects.FindMsg;
BEGIN
obj := NIL;
IF context # NIL THEN (* search by find message *)
M.obj := NIL; M.name := name; context.handle(context, M);
obj := M.obj
END;
RETURN obj
END FindObj;
(** Sets new W and H to (offscreen) frame F. *)
PROCEDURE ModifySize* (F: Display.Frame; W, H: INTEGER);
VAR M: Display.ModifyMsg;
BEGIN
IF (F # NIL) & ((F.W # W) OR (F.H # H)) THEN
M.id := Display.extend; M.mode := Display.state; M.F := F;
M.X := F.X; M.Y := F.Y + F.H - H; M.W := W; M.H := H;
M.dW := W - F.W; M.dH := H - F.H; M.dX := 0; M.dY := -M.dH;
M.dlink := NIL; M.x := 0; M.y := 0; M.res := -1; Objects.Stamp(M);
F.handle(F, M)
END
END ModifySize;
(** Inserts the frame f into container F at (u, v). (u, v) is relative to upper left corner of F. *)
PROCEDURE Consume* (F, f: Frame; u, v: INTEGER);
VAR C: Display.ConsumeMsg;
BEGIN
IF (F # NIL) & (f # NIL) THEN
f.slink := NIL;
C.id := Display.drop; C.F := F;
C.res := -1; C.dlink := NIL; C.x := 0; C.v := 0;
C.u := u; C.v := v; C.obj := f;
F.handle(F, C)
END
END Consume;
(** Returns a deep or shallow copy of object obj, depending on parameter deep *)
PROCEDURE Clone*(obj: Objects.Object; deep: BOOLEAN): Objects.Object;
VAR C: Objects.CopyMsg;
BEGIN
C.obj := NIL;
IF obj # NIL THEN
IF deep THEN C.id := Objects.deep ELSE C.id := Objects.shallow END;
Objects.Stamp(C); C.dlink := NIL; obj.handle(obj, C)
END;
RETURN C.obj
END Clone;
(* --- Recursion checking --- *)
PROCEDURE *RecursiveHandler(obj: Objects.Object; VAR M: Objects.ObjMsg);
BEGIN IF ~(M IS Display3.UpdateMaskMsg) THEN recurse := TRUE END;
END RecursiveHandler;
(** Check if a message loop would be created should newchild be inserted in the container parent. Sends a dummy message behind the scenes. *)
PROCEDURE Recursive*(parent, newchild: Objects.Object): BOOLEAN;
VAR old: Objects.Handler; M: RecursiveMsg;
BEGIN
old := parent.handle; M.dlink := NIL; M.F := NIL; M.x := 0; M.y := 0; M.res:= -1;
parent.handle := RecursiveHandler; recurse := FALSE;
newchild.handle(newchild, M);
parent.handle := old;
RETURN recurse;
END Recursive;
(** Broadcasts an Gadgets.UpdateMsg should obj be a model gadget, or a Display.DisplayMsg if obj is a Display.Frame. *)
PROCEDURE Update*(obj: Objects.Object);
VAR M: UpdateMsg; D: Display.DisplayMsg;
BEGIN
IF obj IS Display.Frame THEN
D.device := Display.screen; D.id := Display.full; D.F := obj(Display.Frame); Display.Broadcast(D)
ELSE
M.obj := obj; M.F := NIL; Display.Broadcast(M)
END;
END Update;
(** Make a copy of a pointer to an object. A shallow copy returns a reference to obj. A deep copy results in M being forwarded to obj. *)
PROCEDURE CopyPtr*(VAR M: Objects.CopyMsg; obj: Objects.Object): Objects.Object;
BEGIN
IF obj = NIL THEN RETURN NIL
ELSE
IF M.id = Objects.deep THEN
M.obj := NIL; obj.handle(obj, M); RETURN M.obj
ELSE (* shallow *)
RETURN obj
END;
END;
END CopyPtr;
(** Copy the record fields belonging to the base gadget type. Copies handle, X, Y, W, H, state, attr and obj.*)
PROCEDURE CopyFrame*(VAR M: Objects.CopyMsg; F, F0: Frame);
BEGIN
(* F0.slink := NIL; F0.lib := NIL; F0.ref := -1; F0.next := NIL; F0.dsc := NIL; *)
F0.handle := F.handle; F0.X := F.X; F0.Y := F.Y; F0.W := F.W; F0.H := F.H;
F0.state := F.state;
Attributes.CopyAttributes(F.attr, F0.attr);
Links.CopyLinks(M, F.link, F0.link);
F0.obj := CopyPtr(M, F.obj);
END CopyFrame;
(** Copy the record fields belonging to the base Model gadget type. Copies handle and attr. *)
PROCEDURE CopyObject*(VAR M: Objects.CopyMsg; obj, obj0: Object);
BEGIN
obj0.handle := obj.handle;
Attributes.CopyAttributes(obj.attr, obj0.attr);
Links.CopyLinks(M, obj.link, obj0.link)
END CopyObject;
PROCEDURE *EmptyHandler(obj: Objects.Object; VAR M: Objects.ObjMsg);
END EmptyHandler;
(** Default handling of Display.ModifyMsg for visual gadgets. F.mask is invalidated when the frame changes its location or size. Sends behind the scenes to F an Display.OverlapMsg message to invalidate F.mask. Finally, a Display.DisplayMsg is broadcast to update F on the display.*)
PROCEDURE Adjust*(F: Display.Frame; VAR M: Display.ModifyMsg);
VAR D: Display.DisplayMsg; O: Display3.OverlapMsg;
BEGIN
IF (F.X # M.X) OR (F.Y # M.Y) OR (F.W # M.W) OR (F.H # M.H) THEN (* first adjust *)
F.X := M.X; F.Y := M.Y; F.W := M.W; F.H := M.H;
IF F IS Frame THEN O.F := F; O.M := NIL; O.x := 0; O.y := 0; O.res := -1; O.dlink := NIL; F.handle(F, O);
END
END;
IF (M.mode = Display.display) & (F.H > 0) & (F.W >0) THEN
D.x := M.x; D.y := M.y; D.F := F; D.device := Display.screen; D.id := Display.full;
D.dlink := M.dlink; D.res := -1; Objects.Stamp(D);
F.handle(F, D)
END
END Adjust;
(** Returns the frame that is located at X, Y on the display. U, v return the relative coordinates of X, Y inside F. Behind the scenes a Display.LocateMsg is broadcast. *)
PROCEDURE ThisFrame*(X, Y: INTEGER; VAR F: Display.Frame; VAR u, v: INTEGER);
VAR M: Display.LocateMsg;
BEGIN M.X := X; M.Y := Y; M.F := NIL; M.loc := NIL; Display.Broadcast(M); F := M.loc; u := M.u; v := M.v;
END ThisFrame;
(** Implements standard resize handling for frames. Rubber-bands the gadget size and broadcasts a Display.ModifyMsg. *)
PROCEDURE SizeFrame*(F: Display.Frame; VAR M: Oberon.InputMsg);
VAR x, y, w, h, X, Y: INTEGER; keys: SET; A: Display.ModifyMsg;
BEGIN
x := M.x + F.X; y := M.y + F.Y; w := F.W; h := F.H;
Input.Mouse(keys, X, Y);
Effects.SizeRect(NIL, keys, X, Y, x, y, w, h, NIL);
IF keys # {0, 1, 2} THEN
A.id := Display.extend; A.mode := Display.display; A.X := x - M.x; A.Y := y - M.y; A.W := w; A.H := h;
A.F := F; A.dX := A.X - F.X; A.dY := A.Y - F.Y; A.dW := A.W - F.W; A.dH := A.H - F.H;
Display.Broadcast(A);
M.res := 0
ELSE M.res := 1
END
END SizeFrame;
(** Implements standard move behaviour for frames. Tracks the gadget outline, broadcasts a ConsumeMsg on a copy-over or consume interclick, or broadcast a Display.ModifyMsg for a simple move operation. *)
PROCEDURE MoveFrame*(F: Display.Frame; VAR M: Oberon.InputMsg);
VAR x, y, w, h, X, Y, u0, v0: INTEGER; keys: SET; A: Display.ModifyMsg; f: Display.Frame;
C: Display.ConsumeMsg; old: Objects.Handler; CM: Objects.CopyMsg;
BEGIN
x := M.x + F.X; y := M.y + F.Y; w := F.W; h := F.H;
Input.Mouse(keys, X, Y);
Effects.MoveRect(NIL, keys, X, Y, x, y, w, h);
old := F.handle; F.handle := EmptyHandler;
ThisFrame(X, Y, f, u0, v0);
F.handle := old;
IF keys = {middle, right} THEN (* copy frame *)
IF f # NIL THEN
CM.id := Objects.shallow; Objects.Stamp(CM); F.handle(F, CM); CM.obj.slink := NIL; (* copy the object *)
C.id := Display.drop; C.obj := CM.obj; C.F := f; C.u := u0 + (x - X); C.v := v0 + (y - Y);
Display.Broadcast(C);
END;
M.res := 2; (* copied *)
ELSIF keys = {middle, left} THEN (* consume frame *)
IF f # NIL THEN
(* do a consume *)
C.id := Display.drop; C.obj := F; F.slink := NIL; C.F := f; C.u := u0 + (x - X); C.v := v0 + (y - Y);
Display.Broadcast(C)
END;
M.res := 0 (* moved *)
ELSIF (keys = {middle}) OR (keys = {left}) THEN (* move frame, left key is a special hack, see docframes *)
A.id := Display.move; A.mode := Display.display;
A.X := x - M.x; A.Y := y - M.y;
A.W := w; A.H := h;
A.F := F; A.dX := A.X - F.X; A.dY := A.Y - F.Y; A.dW := A.W - F.W; A.dH := A.H - F.H;
Display.Broadcast(A);
M.res := 0 (* moved *)
ELSE M.res := 1 (* cancel *)
END;
(* Kernel.GC *)
END MoveFrame;
(** Integrate obj at the caret position. A Display.ConsumeMsg is broadcast behind the scenes. *)
PROCEDURE Integrate*(obj: Objects.Object);
VAR C: Display.ConsumeMsg;
BEGIN
IF obj # NIL THEN
C.id := Display.integrate; C.obj := obj; C.F := NIL; Display.Broadcast(C);
END;
END Integrate;
PROCEDURE Atom(lib: Objects.Library; IN name: ARRAY OF CHAR): INTEGER;
VAR ref: INTEGER;
BEGIN
Objects.GetKey(lib.dict, name, ref);
RETURN ref;
END Atom;
(** Write an object POINTER to a file. Lib is the library of the object that contains the pointer.*)
PROCEDURE WriteRef*(VAR r: Files.Rider; lib: Objects.Library; obj: Objects.Object);
BEGIN
IF obj = NIL THEN
Files.WriteInt(r, -1);
ELSE
IF obj.lib # NIL THEN
IF obj.lib # lib THEN
IF obj.lib.name = "" THEN (* private library *)
Files.WriteInt(r, -1);
Texts.WriteString(W, "Warning: Object belonging to private library referenced in ");
IF lib.name = "" THEN Texts.WriteString(W, "(private)")
ELSE Texts.WriteString(W, lib.name)
END;
Texts.WriteLn(W); Log;
ELSE
Files.WriteInt(r, obj.ref);
Files.WriteInt(r, Atom(lib, obj.lib.name));
END;
ELSE
Files.WriteInt(r, obj.ref);
Files.WriteInt(r, Atom(lib, "")); (* belongs to this library *)
END;
IF obj.lib.name # lib.name THEN
IF verbose THEN
Texts.WriteString(W, "Note: ");
IF lib.name = "" THEN Texts.WriteString(W, "(private)")
ELSE Texts.WriteString(W, lib.name)
END;
Texts.WriteString(W, " imports ");
Texts.WriteString(W, obj.lib.name); Texts.WriteLn(W); Log
END
END
ELSE
Files.WriteInt(r, -1);
IF verbose THEN
Texts.WriteString(W, "Warning: Object without library referenced in ");
IF lib.name = "" THEN Texts.WriteString(W, "(private)")
ELSE Texts.WriteString(W, lib.name)
END;
Texts.WriteLn(W); Log
END
END
END
END WriteRef;
(** Read an object POINTER from a file. Lib is the library of the object that contains the pointer. Obj might be of type Objects.Dummy if a loading failure occured. *)
PROCEDURE ReadRef*(VAR r: Files.Rider; lib: Objects.Library; VAR obj: Objects.Object);
VAR i, l: INTEGER; F: Objects.Library; name: ARRAY 32 OF CHAR;
BEGIN
Files.ReadInt(r, i);
IF i = -1 THEN
obj := NIL;
ELSE
Files.ReadInt(r, l);
Objects.GetName(lib.dict, l, name);
IF name[0] = 0X THEN F := lib; name := lib.name; ELSE F := Objects.ThisLibrary(name); END;
IF F # NIL THEN
F.GetObj(F, i, obj);
IF (name # lib.name) & (obj # NIL) THEN
IF verbose THEN
Texts.WriteString(W, "Note: ");
IF lib.name = "" THEN Texts.WriteString(W, "(private)")
ELSE Texts.WriteString(W, lib.name)
END;
Texts.WriteString(W, " imports ");
Texts.WriteString(W, obj.lib.name); Texts.WriteLn(W); Log
END
END;
IF obj = NIL THEN
Texts.WriteString(W, "Warning: "); Texts.WriteString(W, "Object imported from ");
Texts.WriteString(W, name); Texts.WriteString(W, " does not exist (NIL pointer)");
Texts.WriteLn(W); Log;
END;
ELSE
Texts.WriteString(W, "Warning: "); Texts.WriteString(W, name); Texts.WriteString(W, " not found");
Texts.WriteLn(W); Log;
obj := NIL;
END;
END;
END ReadRef;
PROCEDURE MakeMaskFor(G: Frame);
VAR MM: Display3.UpdateMaskMsg; O: Display3.OverlapMsg; M: Display3.Mask;
BEGIN
MM.F := G; Display.Broadcast(MM);
IF G.mask = NIL THEN
(* good debug test
IF ~(dlink IS View) & (dlink IS Frame) THEN HALT(99) END;
*)
(* constructing a dummy mask *)
NEW(M); Display3.Open(M);
Display3.Add(M, 0, -G.H+1, G.W, G.H); M.x := 0; M.y := 0;
O.F := G; O.M := M; O.dlink := NIL; O.res := -1; O.x := 0; O.y := 0; G.handle(G, O);
IF G.mask = NIL THEN G.mask := M END; (* frame is still misbehaving *)
END
END MakeMaskFor;
PROCEDURE *MakeMask0(G: Frame; X, Y: INTEGER; dlink: Objects.Object; VAR M: Display3.Mask);
VAR ox, oy, x, y, w, h, b, b2: INTEGER; R: Display3.Mask; v: Objects.Object;
BEGIN
IF G.mask = NIL THEN (* mask has been invalidated *)
MakeMaskFor(G)
END;
M := G.mask; M.x := X; M.y := Y + G.H - 1;
(* clear the clipping port *)
M.X := X; M.Y := Y; M.W := G.W; M.H := G.H;
(* go through the view stack and modify the mask *)
IF dlink # NIL THEN
v := dlink;
WHILE v # NIL DO
IF v IS View THEN
WITH v: View DO
IF v.mask = NIL THEN (* very bad *)
MakeMaskFor(v)
END;
ox := v.mask.x; oy := v.mask.y;
v.mask.x := v.absX; v.mask.y := v.absY + v.H - 1; (* place mask at absolute position *)
IF Display3.Rectangular(v.mask, x, y, w, h) THEN
Display3.AdjustMask(M, x, y, w, h);
ELSIF Display3.Visible(v.mask, X, Y, G.W, G.H) THEN (* frame completely visible *)
Display3.AdjustMask(M, X, Y, G.W, G.H);
ELSE (* waste memory because of overlapping *)
Display3.IntersectMasks(M, v.mask, R);
R.X := M.X; R.Y := M.Y; R.W := M.W; R.H := M.H; (* set new port to old port *)
M := R;
END;
IF v.ClipMask # NIL THEN v.ClipMask(v, M, TRUE)
ELSE
b := v.border; b2 := b * 2;
Display3.AdjustMask(M, v.absX+b, v.absY+b, v.W-b2, v.H-b2)
END;
v.mask.x := ox; v.mask.y := oy
END
(*
ELSIF (v IS Frame) & (31 IN v(Frame).state) THEN (* from definition these should be position absolutely *)
WITH v: Display.Frame DO
Display3.AdjustMask(M, v.X, v.Y, v.W, v.H)
END
*)
ELSIF (v IS Viewers.Viewer) THEN
ELSIF ~(v IS Frame) & (v IS Display.Frame) THEN (* from definition these should be position absolutely *)
WITH v: Display.Frame DO
Display3.AdjustMask(M, v.X, v.Y, v.W, v.H)
END
END;
v := v.dlink;
END;
END;
END MakeMask0;
PROCEDURE P(x : INTEGER) : INTEGER;
BEGIN RETURN SHORT(x * Display.Unit DIV Printer.Unit) END P;
PROCEDURE *EnumMakePrinterMask(X,Y,W,H: INTEGER);
VAR R, T, L, B: INTEGER;
BEGIN
L := P(X-tmpX) + tmpX; B := P(Y - tmpY) + tmpY;
R := P(X-tmpX + W) + tmpX; T := P(Y - tmpY +H) + tmpY;
Display3.Add(pMask, L, B, R-L, T-B);
END EnumMakePrinterMask;
PROCEDURE MakePMask0(G: Frame; X, Y: INTEGER; VAR M: Display3.Mask);
VAR MM: Display3.UpdateMaskMsg;
BEGIN
IF G.mask = NIL THEN (* mask has been invalidated *)
MM.F := G; Display.Broadcast(MM);
IF G.mask = NIL THEN
(* constructing a dummy mask *)
NEW(M); Display3.Open(M);
Display3.Add(M, 0, -G.H+1, G.W, G.H); M.x := X; M.y := Y + G.H - 1;
IF verbose THEN
Texts.WriteString(W, "Warning Gadgets.MakeMask: creating a default mask"); Texts.WriteLn(W); Log
END
ELSE M := G.mask; M.x := X; M.y := Y + G.H - 1
END;
ELSE
M := G.mask; M.x := X; M.y := Y + G.H - 1
END;
(* clear the clipping port *)
M.X := X; M.Y := Y; M.W := G.W; M.H := G.H;
END MakePMask0;
PROCEDURE ScaleMask(px, py: INTEGER; in: Display3.Mask; VAR out: Display3.Mask);
BEGIN
NEW(pMask); Display3.Open(pMask);
tmpX := px; tmpY := py;
Display3.EnumRect(in, in.X, in.Y, in.W, in.H, EnumMakePrinterMask);
pMask.X := Printer.FrameX; pMask.Y := Printer.FrameY; pMask.W := Printer.FrameW; pMask.H := Printer.FrameH;
out := pMask;
END ScaleMask;
PROCEDURE *MakePrinterMask0(G: Frame; X, Y: INTEGER; dlink: Objects.Object; VAR M: Display3.Mask);
VAR ox, oy, x, y, w, h, b, b2: INTEGER; R, R0: Display3.Mask; v: Objects.Object;
BEGIN
(* make the basic mask *)
MakePMask0(G, X, Y, M);
(* scale it *)
ScaleMask(X, Y, M, M);
(* add views clipping *)
IF dlink # NIL THEN
v := dlink;
WHILE v # NIL DO
IF (v IS View) & (v(View).mask # NIL) THEN
WITH v: View DO
ox := v.mask.x; oy := v.mask.y;
v.mask.x := v.absX; v.mask.y := v.absY + v.H - 1; (* place mask at absolute position *)
ScaleMask(v.absX, v.absY, v.mask, R);
IF Display3.Rectangular(R, x, y, w, h) THEN
Display3.AdjustMask(M, x, y, w, h);
ELSIF Display3.Visible(R, X, Y, P(G.W), P(G.H)) THEN (* frame completely visible *)
Display3.AdjustMask(M, X, Y, P(G.W), P(G.H));
ELSE (* waste memory because of overlapping *)
Display3.IntersectMasks(M, R, R0);
R0.X := M.X; R0.Y := M.Y; R0.W := M.W; R0.H := M.H; (* set new port to old port *)
M := R0;
END;
IF v.ClipMask # NIL THEN v.ClipMask(v, M, FALSE)
ELSE
b := v.border; b2 := b * 2;
Display3.AdjustMask(M, v.absX+P(b), v.absY+P(b), P(v.W-b2), P(v.H-b2))
END;
v.mask.x := ox; v.mask.y := oy
END
END;
v := v.dlink;
END
END
END MakePrinterMask0;
(** Execute a string as an Oberon command. The parameters executor, dlink, sender, receiver are copied to the global variables executorObj, context, senderObj, receiverObj respectively. Dlink must be the parent of executor. If a '%' is leading the command, no Oberon.Par is set up. *)
PROCEDURE Execute*(cmd: ARRAY OF CHAR; executor, dlink, sender, receiver: Objects.Object);
VAR T: Texts.Text; S: Attributes.Scanner; ch: CHAR; res, cx, cy, cw, chl, i, j: INTEGER;
oldcontext, obj: Objects.Object; str: BOOLEAN;
BEGIN
IF cmd[0] = 0X THEN RETURN END;
ch := 0X; T := NIL;
Display.GetClip(cx, cy, cw, chl); Display.ResetClip;
executorObj := executor; context := dlink; senderObj := sender; receiverObj := receiver;
NEW(par); par.obj := executor;
(* calculate outermost frame in the menuviewer*)
IF context = NIL THEN context := executor END; (* may be the outside most frame *)
obj := context;
LOOP
IF (obj = NIL) OR (obj.dlink = NIL) OR (obj.dlink IS Viewers.Viewer) THEN EXIT END;
obj := obj.dlink
END;
IF (obj # NIL) & (obj IS Display.Frame) THEN par.frame := obj(Display.Frame)
ELSE par.frame := Oberon.Par.frame (* hack, otherwise Oberon.Call traps *)
END;
(* modified ps - 6.6.96 *)
IF cmd[0] = "%" THEN
par.text := emptyText; par.pos := 0;
i := 1;
WHILE cmd[i] > " " DO cmd[i-1] := cmd[i]; INC(i) END;
cmd[i-1] := 0X
ELSIF cmd[0] = "$" THEN
NEW(par.text); Texts.Open(par.text, "");
i := 1;
WHILE cmd[i] > " " DO
Texts.Write(W, cmd[i]); cmd[i-1] := cmd[i]; INC(i)
END;
cmd[i-1] := 0X; par.pos := i-1;
WHILE cmd[i] # 0X DO
Texts.Write(W, cmd[i]); INC(i)
END;
Texts.Append(par.text, W.buf)
ELSE
IF ("A" <= CAP(cmd[0])) & (CAP(cmd[0]) <= "Z") THEN (* direct command *)
i := 0;
WHILE (cmd[i] # 0X) & (cmd[i] > " ") DO INC(i) END;
j := i;
WHILE (cmd[j] # 0X) & (cmd[j] <= " ") DO INC(j) END;
IF cmd[j] # 0X THEN
Attributes.StrToTxt(cmd, T); Attributes.OpenScanner(S, T, 0); Attributes.Scan(S);
Attributes.Read(S.R, ch)
END
ELSE (* command has to be retrieved by macro handler *)
Attributes.StrToTxt(cmd, T);
Attributes.OpenScanner(S, T, 0); Attributes.Scan(S);
i := 0; j:= 0;
WHILE S.s[i] # 0X DO cmd[i] := S.s[i]; INC(i) END;
Attributes.Read(S.R, ch);
WHILE ~S.R.eot & (ch <= " ") DO Attributes.Read(S.R, ch) END;
IF S.R.eot THEN cmd[i] := 0X; j := i END
END;
(* set up parameter block *)
IF cmd[j] # 0X THEN
str := FALSE;
WHILE ~S.R.eot & (str OR (ch # "~")) DO
IF (ch = 22X) THEN S.R.substitute := ~S.R.substitute; str := ~str END;
Texts.Write(W, ch); Attributes.Read(S.R, ch);
END;
par.pos := T.len; par.text := T;
Texts.Append(T, W.buf)
ELSE
par.text := emptyText;
par.pos := 0
END;
cmd[i] := 0X
END;
IF executor # NIL THEN oldcontext := executor.dlink; executor.dlink := context END;
Oberon.Call(cmd, par, FALSE, res);
IF res # 0 THEN
Texts.WriteString(W, "Call error: "); Texts.WriteString(W, Modules.resMsg);
Texts.WriteLn(W); Texts.Append(Oberon.Log, W.buf)
END;
IF par # NIL THEN par.obj := NIL END;
IF executor # NIL THEN executor.dlink := oldcontext END;
Display.SetClip(cx, cy, cw, chl);
executorObj := NIL; context := NIL; senderObj := NIL; receiverObj := NIL; par := NIL
END Execute;
(* Macros *)
PROCEDURE ReadName(VAR T: Attributes.Reader; VAR name: ARRAY OF CHAR);
VAR ch: CHAR; i: INTEGER; old: BOOLEAN;
PROCEDURE Ok(ch: CHAR): BOOLEAN;
BEGIN
RETURN (ch = ".") OR ((ch >= "0") & (ch <= "9")) OR ((CAP(ch) >= "A") & (CAP(ch) <= "Z"));
END Ok;
BEGIN
i := 0; old := T.substitute; T.substitute := FALSE;
LOOP Attributes.Read(T, ch);
IF T.eot THEN EXIT; END;
IF ~Ok(ch) THEN EXIT END;
name[i] := ch; INC(i);
END;
name[i] := 0X;
T.substitute := old;
END ReadName;
(* special code for the & macro. && for next higher context etc. *)
PROCEDURE Lookup0(VAR T: Attributes.Reader; VAR name: ARRAY OF CHAR; VAR context: Objects.Object);
VAR ch: CHAR; i: INTEGER; old: BOOLEAN;
PROCEDURE Ok(ch: CHAR): BOOLEAN;
BEGIN
RETURN (ch = ".") OR ((ch >= "0") & (ch <= "9")) OR ((CAP(ch) >= "A") & (CAP(ch) <= "Z"));
END Ok;
BEGIN
i := 0; old := T.substitute; T.substitute := FALSE;
Attributes.Read(T, ch);
WHILE ~T.eot & (ch = "&") DO
IF (context # NIL) & (context.dlink # NIL) THEN context := context.dlink END;
Attributes.Read(T, ch)
END;
LOOP
IF T.eot THEN EXIT; END;
IF ~Ok(ch) THEN EXIT END;
name[i] := ch; INC(i);
Attributes.Read(T, ch);
END;
name[i] := 0X;
T.substitute := old;
END Lookup0;
PROCEDURE ObjAttr(name: ARRAY OF CHAR; context: Objects.Object; VAR W: Texts.Writer);
VAR i, j: INTEGER; attr: ARRAY 32 OF CHAR; obj: Objects.Object;
BEGIN
IF name # "" THEN
i := 0; WHILE name[i] # 0X DO INC(i); END;
WHILE (i > 0) & (name[i] # ".") DO DEC(i); END;
IF name[i] = "." THEN
name[i] := 0X; INC(i); j := 0;
WHILE name[i] # 0X DO attr[j] := name[i]; INC(i); INC(j); END;
attr[j] := 0X;
obj := FindObj(context, name);
IF obj # NIL THEN Attributes.WriteAttr(obj, attr, W);
ELSE Texts.WriteLn(WW); Texts.WriteString(WW, "Object not found: "); Texts.WriteString(WW, name);
Texts.WriteLn(WW); Texts.Append(Oberon.Log, WW.buf)
END
ELSE Texts.WriteLn(WW); Texts.WriteString(WW, "Syntax error: "); Texts.WriteString(WW, name);
Texts.WriteLn(WW); Texts.Append(Oberon.Log, WW.buf)
END
END
END ObjAttr;
PROCEDURE *StandardMacros(ch: CHAR; VAR T: Attributes.Reader; VAR res: Texts.Text; VAR beg: LONGINT);
VAR name: ARRAY 64 OF CHAR; f, context0: Objects.Object;
BEGIN
IF ch # 0X THEN
NEW(res); Texts.Open(res, ""); beg := 0;
IF ch = "&" THEN
context0 := context;
Lookup0(T, name, context0); ObjAttr(name, context0, mW); Texts.Append(res, mW.buf)
ELSIF ch = "#" THEN
ReadName(T, name);
Attributes.WriteAttr(executorObj, name, mW); Texts.Append(res, mW.buf);
ELSIF ch = "!" THEN (* more than one sender *)
IF senderObj # NIL THEN
ReadName(T, name);
f := senderObj;
WHILE f # NIL DO
Attributes.WriteAttr(f, name, mW); Texts.Write(mW, " ");
f := f.slink
END;
Texts.Write(mW, " "); Texts.Append(res, mW.buf);
END
ELSIF ch = "'" THEN
Texts.Write(mW, 22X); Texts.Append(res, mW.buf);
ELSIF ch = "?" THEN (* only one recipient *)
ReadName(T, name);
Attributes.WriteAttr(receiverObj, name, mW);
Texts.Append(res, mW.buf);
END
END
END StandardMacros;
PROCEDURE *UpArrowMacro(ch: CHAR; VAR T: Attributes.Reader; VAR res: Texts.Text; VAR beg: LONGINT);
VAR text, text0: Texts.Text; bg, end, ttime: LONGINT; obj: Objects.Object; S: Display.SelectMsg;
i: INTEGER; name: ARRAY 32 OF CHAR; R: Attributes.Reader; ch0: CHAR; old: Objects.Library;
string: BOOLEAN;
BEGIN
IF ch = 0X THEN (* Reset *)
uparrowdone := FALSE;
ELSIF (ch = "^") THEN (* getselection *)
IF ~uparrowdone THEN uparrowdone := TRUE;
Attributes.Read(T, ch);
IF (CAP(ch) >= "A") & (CAP(ch) <= "Z") THEN (* skip word *)
i := 0;
LOOP name[i] := ch; INC(i);
Attributes.Read(T, ch);
IF T.eot THEN EXIT; END;
IF (ch # ".") & ((ch <= " ") OR ((CAP(ch) < "A") OR (CAP(ch) > "Z"))) THEN EXIT END;
END;
name[i] := 0X;
END;
Oberon.GetSelection(text, bg, end, ttime);
S.id := Display.get; S.F := NIL; S.sel := NIL; S.obj := NIL; S.time := 0; Display.Broadcast(S);
IF (S.time > ttime) & (S.obj # NIL) & (name # "") THEN
NEW(text); Texts.Open(text, ""); beg := 0;
IF S.time > 0 THEN
obj := S.obj;
WHILE obj # NIL DO
IF obj IS Frame THEN Attributes.WriteAttr(obj, name, W); Texts.Write(W, " ");
END;
obj := obj.slink;
END;
Texts.Append(text, W.buf); res := text;
ELSE res := NIL
END;
ELSE
IF ttime > 0 THEN
(* res := text; beg := bg; *)
Attributes.OpenReader(R, text, bg); uparrowdone := TRUE; beg := bg;
NEW(text0); Texts.Open(text0, ""); string := FALSE;
Attributes.Read(R, ch0);
WHILE ~R.eot & (beg < end) DO
IF ch0 = 22X THEN R.substitute := ~R.substitute; string := ~string END;
old := W.lib; W.lib := R.lib; Texts.Write(W, ch0); W.lib := old;
IF beg + 1 = end THEN (* reached the end, ch0 is the last character read *)
IF (ch0 # " ") & (ch0 # 0DX) & (ch0 # 9X) THEN
Attributes.Read(R, ch0)
ELSE ch0 := " " (* ended on a termination char *)
END
ELSE
Attributes.Read(R, ch0)
END;
INC(beg);
END;
WHILE ~R.eot & (string OR ((ch0 # " ") & (ch0 # 0DX) & (ch0 # 9X))) DO
IF ch0 = 22X THEN R.substitute := ~R.substitute; string := ~string END;
old := W.lib; W.lib := R.lib; Texts.Write(W, ch0); W.lib := old;
Attributes.Read(R, ch0); INC(beg);
END;
Texts.Write(W, " "); Texts.Append(text0, W.buf); beg := 0; end := text0.len; res := text0
ELSE res := NIL;
END;
END;
ELSE
res := NIL; beg := 0;
END;
END;
END UpArrowMacro;
(** Forwards a message from a camera-view to its contents, inserting the camera-view in the message thread. X, Y is the absolute screen coordinates of the bottom-left corner of the camera-view. This is important for calculating the correct display mask for the contents of the view. *)
PROCEDURE Send*(from: View; X, Y: INTEGER; to: Display.Frame; VAR M: Display.FrameMsg);
VAR S: Stack;
BEGIN
Push(S, from, M); from.absX := X; from.absY := Y; to.handle(to, M); Pop(S, from, M);
END Send;
(* ---------- leaf handler ---------- *)
PROCEDURE HandleFrameAttributes(F: Frame; VAR M: Objects.AttrMsg);
VAR b: Attributes.BoolAttr; c: Attributes.CharAttr; i: Attributes.IntAttr; r: Attributes.RealAttr; s: Attributes.StringAttr; a, f: Attributes.Attr;
BEGIN
IF M.id = Objects.get THEN
a := F.attr;
WHILE (a # NIL) & (a.name # M.name) DO a := a.next END;
IF a # NIL THEN
IF a IS Attributes.BoolAttr THEN M.class := Objects.Bool; M.b := a(Attributes.BoolAttr).b;
ELSIF a IS Attributes.CharAttr THEN M.class := Objects.Char; M.c := a(Attributes.CharAttr).c;
ELSIF a IS Attributes.IntAttr THEN M.class := Objects.Int; M.i := a(Attributes.IntAttr).i;
ELSIF a IS Attributes.RealAttr THEN M.class := Objects.LongReal; M.y := a(Attributes.RealAttr).r;
ELSIF a IS Attributes.StringAttr THEN M.class := Objects.String; M.s := a(Attributes.StringAttr).s;
ELSE HALT(42)
END;
M.res := 0;
ELSIF M.name = "Gen" THEN HALT(99)
ELSIF (M.name = "Name") & (F.lib # NIL) & (F.lib.name # "") THEN
M.s[0] := 0X;
Objects.GetName(F.lib.dict, F.ref, M.s); M.class := Objects.String; M.res := 0
ELSIF M.name = "Transparent" THEN (* hidden attributes: special hack/rs wish *)
M.b := transparent IN F.state; M.class := Objects.Bool; M.res := 0
(* should return nothing
ELSE M.class := Objects.String; M.s[0] := 0X; M.res := 0 (* must be. some gadgets advertize Cmd *)
*)
END;
ELSIF M.id = Objects.set THEN
IF M.name = "Gen" THEN HALT(99)
ELSIF (M.name = "Name") (*& (M.s # "")*) THEN