Add StringGrid control type

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

forms/README.md

@@ -336,6 +336,7 @@ messages are available, dispatching each command as it arrives.
 | `Bevel`       | TBevel       | Cosmetic beveled line/box      |
 | `Header`      | THeader      | Column header bar              |
 | `ScrollBox`   | TScrollBox   | Scrollable container           |
+| `StringGrid`  | TStringGrid  | Editable string grid           |
 
 ### Creating Controls
 
@@ -728,6 +729,91 @@ Input mask string (mask;save literals;blank char).
 - **Format:** `0` (bsLowered) or `1` (bsRaised)
 - **Example:** `Style=1`
 
+### ColCount
+
+- **Applies to:** StringGrid
+- **Format:** Integer (default 5)
+- **Example:** `ColCount=10`
+
+Number of columns in the grid.
+
+### RowCount
+
+- **Applies to:** StringGrid
+- **Format:** Integer (default 5)
+- **Example:** `RowCount=20`
+
+Number of rows in the grid.
+
+### FixedCols
+
+- **Applies to:** StringGrid
+- **Format:** Integer (default 1)
+- **Example:** `FixedCols=1`
+
+Number of non-scrollable columns on the left.
+
+### FixedRows
+
+- **Applies to:** StringGrid
+- **Format:** Integer (default 1)
+- **Example:** `FixedRows=1`
+
+Number of non-scrollable rows at the top.
+
+### DefaultColWidth
+
+- **Applies to:** StringGrid
+- **Format:** Integer (pixels)
+- **Example:** `DefaultColWidth=80`
+
+### DefaultRowHeight
+
+- **Applies to:** StringGrid
+- **Format:** Integer (pixels)
+- **Example:** `DefaultRowHeight=20`
+
+### Options (StringGrid)
+
+- **Applies to:** StringGrid
+- **Format:** Integer (bitmask)
+- **Example:** `Options=1549`
+
+Bitmask of TGridOption values:
+
+| Bit | Value  | Option              | Description               |
+|-----|--------|---------------------|---------------------------|
+| 0   | 0x0001 | goFixedVertLine     | Vertical lines on fixed   |
+| 1   | 0x0002 | goFixedHorzLine     | Horizontal lines on fixed |
+| 2   | 0x0004 | goVertLine          | Vertical lines on cells   |
+| 3   | 0x0008 | goHorzLine          | Horizontal lines on cells |
+| 4   | 0x0010 | goRangeSelect       | Allow range selection     |
+| 5   | 0x0020 | goDrawFocusSelected | Draw focused cell selected|
+| 6   | 0x0040 | goRowSizing         | Allow row resizing        |
+| 7   | 0x0080 | goColSizing         | Allow column resizing     |
+| 8   | 0x0100 | goRowMoving         | Allow row moving          |
+| 9   | 0x0200 | goColMoving         | Allow column moving       |
+| 10  | 0x0400 | goEditing           | Allow in-place editing    |
+| 11  | 0x0800 | goTabs              | Tab between cells         |
+| 12  | 0x1000 | goThumbTracking     | Track scrollbar thumb     |
+
+### Cells
+
+- **Applies to:** StringGrid
+- **Format:** Quoted string (tab-delimited columns, `\n`-delimited rows)
+- **Example:** `Cells="Name\tAge\nAlice\t30\nBob\t25"`
+
+Bulk-loads all cell data.  Columns are separated by tab characters,
+rows by newlines.  Row 0 is the first row (typically fixed header).
+
+### Cell
+
+- **Applies to:** StringGrid
+- **Format:** Quoted string (`col,row,value`)
+- **Example:** `Cell="1,2,Hello"`
+
+Sets a single cell value.  Column and row are zero-based indices.
+
 ### BasePath
 
 `BasePath` is a property on `TFormClient` (not a protocol property).
@@ -766,6 +852,7 @@ No `EVENT.BIND` command is needed.
 | TabSet      | Change  | `<tabIndex>`                  |
 | TabbedNotebook | Change | `<pageIndex>`              |
 | MaskEdit    | Change  | `"new text"`                  |
+| StringGrid  | SelectCell | `<col> <row>`              |
 
 ### Opt-in Events
 
@@ -784,6 +871,7 @@ client will send them.  Use `EVENT.UNBIND` to disconnect.
 | MouseDown | `<x> <y> <button>`   | 0=left, 1=right, 2=middle        |
 | MouseUp   | `<x> <y> <button>`   | 0=left, 1=right, 2=middle        |
 | MouseMove | `<x> <y> 0`          | Coordinates relative to control   |
+| SetEditText | `<col> <row> "text"` | StringGrid in-place edit        |
 
 ### Form Close Event
 

forms/dfm2form.c

@@ -46,7 +46,8 @@ typedef enum {
     ctOutline,
     ctBevel,
     ctHeader,
-    ctScrollBox
+    ctScrollBox,
+    ctStringGrid
 } CtrlTypeE;
 
 typedef struct {
@@ -140,6 +141,21 @@ typedef struct {
     bool      hasShape;
     bool      hasStyle;
     bool      hasEditMask;
+    int32_t   colCount;
+    int32_t   rowCount;
+    int32_t   fixedCols;
+    int32_t   fixedRows;
+    int32_t   defaultColWidth;
+    int32_t   defaultRowHeight;
+    int32_t   options;
+    bool      hasColCount;
+    bool      hasRowCount;
+    bool      hasFixedCols;
+    bool      hasFixedRows;
+    bool      hasDefaultColWidth;
+    bool      hasDefaultRowHeight;
+    bool      hasOptions;
+    bool      hasOnSetEditText;
 } DfmCtrlT;
 
 typedef struct {
@@ -439,6 +455,9 @@ static CtrlTypeE mapClassName(const char *className) {
     if (stricmp_local(className, "TScrollBox") == 0) {
         return ctScrollBox;
     }
+    if (stricmp_local(className, "TStringGrid") == 0) {
+        return ctStringGrid;
+    }
     return ctUnknown;
 }
 
@@ -1013,6 +1032,59 @@ static void parseProperties(const uint8_t *data, int32_t size, int32_t *pos, Dfm
                 ctrl->style = readIntValue(data, size, pos, tag);
             }
             ctrl->hasStyle = true;
+        } else if (!isForm && stricmp_local(propName, "ColCount") == 0) {
+            ctrl->colCount    = readIntValue(data, size, pos, tag);
+            ctrl->hasColCount = true;
+        } else if (!isForm && stricmp_local(propName, "RowCount") == 0) {
+            ctrl->rowCount    = readIntValue(data, size, pos, tag);
+            ctrl->hasRowCount = true;
+        } else if (!isForm && stricmp_local(propName, "FixedCols") == 0) {
+            ctrl->fixedCols    = readIntValue(data, size, pos, tag);
+            ctrl->hasFixedCols = true;
+        } else if (!isForm && stricmp_local(propName, "FixedRows") == 0) {
+            ctrl->fixedRows    = readIntValue(data, size, pos, tag);
+            ctrl->hasFixedRows = true;
+        } else if (!isForm && stricmp_local(propName, "DefaultColWidth") == 0) {
+            ctrl->defaultColWidth    = readIntValue(data, size, pos, tag);
+            ctrl->hasDefaultColWidth = true;
+        } else if (!isForm && stricmp_local(propName, "DefaultRowHeight") == 0) {
+            ctrl->defaultRowHeight    = readIntValue(data, size, pos, tag);
+            ctrl->hasDefaultRowHeight = true;
+        } else if (!isForm && stricmp_local(propName, "Options") == 0) {
+            if (tag == vaSet) {
+                ctrl->options = 0;
+                while (*pos < size) {
+                    readStr(data, size, pos, strBuf, sizeof(strBuf));
+                    if (strBuf[0] == '\0') {
+                        break;
+                    }
+                    if (stricmp_local(strBuf, "goFixedVertLine") == 0) { ctrl->options |= 0x0001; }
+                    else if (stricmp_local(strBuf, "goFixedHorzLine") == 0) { ctrl->options |= 0x0002; }
+                    else if (stricmp_local(strBuf, "goVertLine") == 0) { ctrl->options |= 0x0004; }
+                    else if (stricmp_local(strBuf, "goHorzLine") == 0) { ctrl->options |= 0x0008; }
+                    else if (stricmp_local(strBuf, "goRangeSelect") == 0) { ctrl->options |= 0x0010; }
+                    else if (stricmp_local(strBuf, "goDrawFocusSelected") == 0) { ctrl->options |= 0x0020; }
+                    else if (stricmp_local(strBuf, "goRowSizing") == 0) { ctrl->options |= 0x0040; }
+                    else if (stricmp_local(strBuf, "goColSizing") == 0) { ctrl->options |= 0x0080; }
+                    else if (stricmp_local(strBuf, "goRowMoving") == 0) { ctrl->options |= 0x0100; }
+                    else if (stricmp_local(strBuf, "goColMoving") == 0) { ctrl->options |= 0x0200; }
+                    else if (stricmp_local(strBuf, "goEditing") == 0) { ctrl->options |= 0x0400; }
+                    else if (stricmp_local(strBuf, "goTabs") == 0) { ctrl->options |= 0x0800; }
+                    else if (stricmp_local(strBuf, "goThumbTracking") == 0) { ctrl->options |= 0x1000; }
+                }
+            } else {
+                ctrl->options = readIntValue(data, size, pos, tag);
+            }
+            ctrl->hasOptions = true;
+        } else if (stricmp_local(propName, "OnSetEditText") == 0) {
+            if (tag == vaIdent) {
+                readStr(data, size, pos, strBuf, sizeof(strBuf));
+            } else {
+                skipValue(data, size, pos, tag);
+            }
+            if (!isForm) {
+                ctrl->hasOnSetEditText = true;
+            }
         } else {
             skipValue(data, size, pos, tag);
         }
@@ -1160,7 +1232,7 @@ static void emitCtrl(FILE *out, int32_t formId, int32_t ctrlId, DfmCtrlT *ctrl)
         "MainMenu", "PopupMenu", "MenuItem", "RadioGroup",
         "BitBtn", "SpeedButton", "TabSet", "Notebook",
         "TabbedNotebook", "MaskEdit", "Outline", "Bevel",
-        "Header", "ScrollBox"
+        "Header", "ScrollBox", "StringGrid"
     };
     char escaped[8192];
 
@@ -1291,6 +1363,27 @@ static void emitCtrl(FILE *out, int32_t formId, int32_t ctrlId, DfmCtrlT *ctrl)
     if (ctrl->hasStyle && ctrl->style != 0) {
         fprintf(out, " Style=%d", ctrl->style);
     }
+    if (ctrl->hasColCount) {
+        fprintf(out, " ColCount=%d", ctrl->colCount);
+    }
+    if (ctrl->hasRowCount) {
+        fprintf(out, " RowCount=%d", ctrl->rowCount);
+    }
+    if (ctrl->hasFixedCols) {
+        fprintf(out, " FixedCols=%d", ctrl->fixedCols);
+    }
+    if (ctrl->hasFixedRows) {
+        fprintf(out, " FixedRows=%d", ctrl->fixedRows);
+    }
+    if (ctrl->hasDefaultColWidth) {
+        fprintf(out, " DefaultColWidth=%d", ctrl->defaultColWidth);
+    }
+    if (ctrl->hasDefaultRowHeight) {
+        fprintf(out, " DefaultRowHeight=%d", ctrl->defaultRowHeight);
+    }
+    if (ctrl->hasOptions) {
+        fprintf(out, " Options=%d", ctrl->options);
+    }
 
     fprintf(out, "\n");
 
@@ -1329,6 +1422,9 @@ static void emitCtrl(FILE *out, int32_t formId, int32_t ctrlId, DfmCtrlT *ctrl)
     if (ctrl->hasOnMouseUp) {
         fprintf(out, "EVENT.BIND %d %d MouseUp\n", formId, ctrlId);
     }
+    if (ctrl->hasOnSetEditText) {
+        fprintf(out, "EVENT.BIND %d %d SetEditText\n", formId, ctrlId);
+    }
 
     // Suppress unused variable warning for autoSelect
     (void)autoSelect;

forms/formcli.pas

@@ -14,7 +14,7 @@ interface
 
 uses
   SysUtils, Classes, Controls, Forms, StdCtrls, ExtCtrls, Menus, Buttons, Tabs,
-  TabNotBk, Mask, Outline, MPlayer, WinTypes, WinProcs;
+  TabNotBk, Mask, Outline, Grids, MPlayer, WinTypes, WinProcs;
 
 const
   MaxMsgLen = 4096;
@@ -34,12 +34,12 @@ type
                 ctMainMenu, ctPopupMenu, ctMenuItem, ctRadioGroup,
                 ctBitBtn, ctSpeedButton, ctTabSet, ctNotebook,
                 ctTabbedNotebook, ctMaskEdit, ctOutline, ctBevel,
-                ctHeader, ctScrollBox);
+                ctHeader, ctScrollBox, ctStringGrid);
 
   { Bound event flags }
   TBoundEvent = (beDblClick, beKeyDown, beKeyUp,
                  beEnter, beExit, beMouseDown, beMouseUp, beMouseMove,
-                 beClick, beNotify);
+                 beClick, beNotify, beSetEditText);
   TBoundEvents = set of TBoundEvent;
 
   { Per-control record }
@@ -120,6 +120,8 @@ type
     procedure HandleRadioGroupClick(Sender: TObject);
     procedure HandleTabSetChange(Sender: TObject);
     procedure HandleTabbedNotebookChange(Sender: TObject);
+    procedure HandleStringGridSelectCell(Sender: TObject; ACol, ARow: Longint; var CanSelect: Boolean);
+    procedure HandleStringGridSetEditText(Sender: TObject; ACol, ARow: Longint; const Value: string);
 
     { Outgoing event helpers }
     procedure SendEvent(FormId, CtrlId: Integer; const EventName: string; const Data: string);
@@ -777,6 +779,36 @@ begin
 end;
 
 
+procedure TFormClient.HandleStringGridSelectCell(Sender: TObject; ACol, ARow: Longint; var CanSelect: Boolean);
+var
+  Tag:    Longint;
+  FormId: Integer;
+  CtrlId: Integer;
+begin
+  Tag    := (Sender as TComponent).Tag;
+  FormId := Tag shr 16;
+  CtrlId := Tag and $FFFF;
+  SendEvent(FormId, CtrlId, 'SelectCell', IntToStr(ACol) + ' ' + IntToStr(ARow));
+  CanSelect := True;
+end;
+
+
+procedure TFormClient.HandleStringGridSetEditText(Sender: TObject; ACol, ARow: Longint; const Value: string);
+var
+  Tag:     Longint;
+  FormId:  Integer;
+  CtrlId:  Integer;
+  Escaped: array[0..4095] of Char;
+begin
+  Tag    := (Sender as TComponent).Tag;
+  FormId := Tag shr 16;
+  CtrlId := Tag and $FFFF;
+  StrPCopy(FTmpBuf, Value);
+  EscapeString(FTmpBuf, Escaped, SizeOf(Escaped));
+  SendEvent(FormId, CtrlId, 'SetEditText', IntToStr(ACol) + ' ' + IntToStr(ARow) + ' "' + StrPas(Escaped) + '"');
+end;
+
+
 procedure TFormClient.HandleFormClose(Sender: TObject;
   var Action: TCloseAction);
 var
@@ -828,6 +860,8 @@ begin
       (CR^.Control as TTabbedNotebook).OnChange := HandleTabbedNotebookChange;
     ctMaskEdit:
       (CR^.Control as TMaskEdit).OnChange := HandleMaskEditChange;
+    ctStringGrid:
+      (CR^.Control as TStringGrid).OnSelectCell := HandleStringGridSelectCell;
   end;
 end;
 
@@ -897,6 +931,12 @@ begin
     if CR^.Control is TMediaPlayer then
       (CR^.Control as TMediaPlayer).OnNotify := HandleMediaPlayerNotify;
     CR^.Bound := CR^.Bound + [beNotify];
+  end
+  else if EventName = 'SetEditText' then
+  begin
+    if CR^.Control is TStringGrid then
+      (CR^.Control as TStringGrid).OnSetEditText := HandleStringGridSetEditText;
+    CR^.Bound := CR^.Bound + [beSetEditText];
   end;
 end;
 
@@ -966,6 +1006,12 @@ begin
     if CR^.Control is TMediaPlayer then
       (CR^.Control as TMediaPlayer).OnNotify := nil;
     CR^.Bound := CR^.Bound - [beNotify];
+  end
+  else if EventName = 'SetEditText' then
+  begin
+    if CR^.Control is TStringGrid then
+      (CR^.Control as TStringGrid).OnSetEditText := nil;
+    CR^.Bound := CR^.Bound - [beSetEditText];
   end;
 end;
 
@@ -981,6 +1027,10 @@ var
   P:     PChar;
   Start: PChar;
   PCR:   PFormCtrlRec;
+  Col:   Integer;
+  Row:   Integer;
+  W:     Word;
+  Opts:  TGridOptions;
 begin
   S := StrPas(Key);
 
@@ -1538,6 +1588,119 @@ begin
     N := StrToIntDef(StrPas(Value), 0);
     if CR^.CtrlType = ctBevel then
       (CR^.Control as TBevel).Style := TBevelStyle(N);
+  end
+  else if S = 'ColCount' then
+  begin
+    N := StrToIntDef(StrPas(Value), 5);
+    if CR^.CtrlType = ctStringGrid then
+      (CR^.Control as TStringGrid).ColCount := N;
+  end
+  else if S = 'RowCount' then
+  begin
+    N := StrToIntDef(StrPas(Value), 5);
+    if CR^.CtrlType = ctStringGrid then
+      (CR^.Control as TStringGrid).RowCount := N;
+  end
+  else if S = 'FixedCols' then
+  begin
+    N := StrToIntDef(StrPas(Value), 1);
+    if CR^.CtrlType = ctStringGrid then
+      (CR^.Control as TStringGrid).FixedCols := N;
+  end
+  else if S = 'FixedRows' then
+  begin
+    N := StrToIntDef(StrPas(Value), 1);
+    if CR^.CtrlType = ctStringGrid then
+      (CR^.Control as TStringGrid).FixedRows := N;
+  end
+  else if S = 'DefaultColWidth' then
+  begin
+    N := StrToIntDef(StrPas(Value), 64);
+    if CR^.CtrlType = ctStringGrid then
+      (CR^.Control as TStringGrid).DefaultColWidth := N;
+  end
+  else if S = 'DefaultRowHeight' then
+  begin
+    N := StrToIntDef(StrPas(Value), 24);
+    if CR^.CtrlType = ctStringGrid then
+      (CR^.Control as TStringGrid).DefaultRowHeight := N;
+  end
+  else if S = 'Options' then
+  begin
+    if CR^.CtrlType = ctStringGrid then
+    begin
+      N := StrToIntDef(StrPas(Value), 0);
+      W := Word(N);
+      Move(W, Opts, SizeOf(Opts));
+      (CR^.Control as TStringGrid).Options := Opts;
+    end;
+  end
+  else if S = 'Cells' then
+  begin
+    if CR^.CtrlType = ctStringGrid then
+    begin
+      UnescapeString(Value, Unesc, SizeOf(Unesc));
+      Row := 0;
+      P   := Unesc;
+      while P^ <> #0 do
+      begin
+        { Parse one row: tab-delimited columns }
+        Col := 0;
+        Start := P;
+        while (P^ <> #0) and (P^ <> #10) do
+        begin
+          if P^ = #9 then
+          begin
+            P^ := #0;
+            if (Col < (CR^.Control as TStringGrid).ColCount) and (Row < (CR^.Control as TStringGrid).RowCount) then
+              (CR^.Control as TStringGrid).Cells[Col, Row] := StrPas(Start);
+            Inc(Col);
+            Inc(P);
+            Start := P;
+          end
+          else
+            Inc(P);
+        end;
+        { Last column in row }
+        if (Col < (CR^.Control as TStringGrid).ColCount) and (Row < (CR^.Control as TStringGrid).RowCount) then
+          (CR^.Control as TStringGrid).Cells[Col, Row] := StrPas(Start);
+        if P^ = #10 then
+          Inc(P);
+        Inc(Row);
+      end;
+    end;
+  end
+  else if S = 'Cell' then
+  begin
+    if CR^.CtrlType = ctStringGrid then
+    begin
+      { Format: "col,row,value" }
+      UnescapeString(Value, Unesc, SizeOf(Unesc));
+      P := Unesc;
+      { Parse col }
+      Start := P;
+      while (P^ <> #0) and (P^ <> ',') do
+        Inc(P);
+      if P^ = ',' then
+      begin
+        P^ := #0;
+        Col := StrToIntDef(StrPas(Start), 0);
+        Inc(P);
+        { Parse row }
+        Start := P;
+        while (P^ <> #0) and (P^ <> ',') do
+          Inc(P);
+        if P^ = ',' then
+        begin
+          P^ := #0;
+          Row := StrToIntDef(StrPas(Start), 0);
+          Inc(P);
+          { Rest is value }
+          if (Col < (CR^.Control as TStringGrid).ColCount) and (Row < (CR^.Control as TStringGrid).RowCount) then
+            (CR^.Control as TStringGrid).Cells[Col, Row] := StrPas(P);
+        end;
+      end;
+    end;
   end;
 end;
 
@@ -1656,6 +1819,8 @@ begin
     Result := ctHeader
   else if S = 'ScrollBox' then
     Result := ctScrollBox
+  else if S = 'StringGrid' then
+    Result := ctStringGrid
   else
     Result := ctUnknown;
 end;
@@ -1833,6 +1998,8 @@ begin
       Comp := THeader.Create(FR^.Form);
     ctScrollBox:
       Comp := TScrollBox.Create(FR^.Form);
+    ctStringGrid:
+      Comp := TStringGrid.Create(FR^.Form);
   end;
 
   if Comp = nil then

forms/protocol.md

@@ -83,6 +83,8 @@ Event data varies by event type:
 | Exit      | (none)                        |
 | Close     | (none)                        |
 | Notify    | (none)                        |
+| SelectCell| `<col> <row>`                 |
+| SetEditText| `<col> <row> "text"`         |
 
 ## Control Types
 
@@ -115,6 +117,7 @@ Event data varies by event type:
 | Bevel       | TBevel       | (none)            |
 | Header      | THeader      | (none)            |
 | ScrollBox   | TScrollBox   | (none)            |
+| StringGrid  | TStringGrid  | SelectCell        |
 
 MainMenu and PopupMenu use `0 0 0 0` geometry (non-visual).  MenuItem
 uses `0 0 0 0` geometry and requires a `Parent` property to specify its
@@ -125,9 +128,9 @@ GroupBox and Panel are cosmetic containers (flat parent model — no child
 containment in the protocol).  RadioButtons are all in one group per form.
 
 Opt-in events (require EVENT.BIND): Click (Image, GroupBox, Panel),
-Notify (MediaPlayer), DblClick, KeyDown, KeyUp, Enter, Exit,
+Notify (MediaPlayer), SetEditText (StringGrid), DblClick, KeyDown,
-MouseDown, MouseUp, MouseMove.  Menu and RadioGroup components do
+KeyUp, Enter, Exit, MouseDown, MouseUp, MouseMove.  Menu and
-not support opt-in events.
+RadioGroup components do not support opt-in events.
 
 ## Properties
 
@@ -174,6 +177,15 @@ not support opt-in events.
 | OutlineStyle| Outline                                     | 0-6 (osText..osTreePictureText)           |
 | Shape       | Bevel                                       | 0-5 (bsBox..bsRightLine)                 |
 | Style       | Bevel                                       | 0-1 (bsLowered, bsRaised)                |
+| ColCount    | StringGrid                                  | Integer (default 5)                       |
+| RowCount    | StringGrid                                  | Integer (default 5)                       |
+| FixedCols   | StringGrid                                  | Integer (default 1)                       |
+| FixedRows   | StringGrid                                  | Integer (default 1)                       |
+| DefaultColWidth | StringGrid                              | Integer (pixels)                          |
+| DefaultRowHeight| StringGrid                              | Integer (pixels)                          |
+| Options     | StringGrid                                  | Integer (bitmask, see below)              |
+| Cells       | StringGrid                                  | Quoted string (tab-delimited cols, `\n`-delimited rows) |
+| Cell        | StringGrid                                  | Quoted string (`col,row,value`)           |
 
 File path properties (Picture, FileName) are resolved relative to the
 client's `BasePath` setting.  Subdirectories are allowed (e.g.,
@@ -185,6 +197,27 @@ MediaPlayer rather than setting a value.  Valid commands: `Open`,
 `Play`, `Stop`, `Close`, `Pause`, `Resume`, `Rewind`, `Next`,
 `Previous`.
 
+StringGrid Options is an integer bitmask of TGridOption values:
+
+| Bit    | Value  | Option              |
+|--------|--------|---------------------|
+| 0      | 0x0001 | goFixedVertLine     |
+| 1      | 0x0002 | goFixedHorzLine     |
+| 2      | 0x0004 | goVertLine          |
+| 3      | 0x0008 | goHorzLine          |
+| 4      | 0x0010 | goRangeSelect       |
+| 5      | 0x0020 | goDrawFocusSelected |
+| 6      | 0x0040 | goRowSizing         |
+| 7      | 0x0080 | goColSizing         |
+| 8      | 0x0100 | goRowMoving         |
+| 9      | 0x0200 | goColMoving         |
+| 10     | 0x0400 | goEditing           |
+| 11     | 0x0800 | goTabs              |
+| 12     | 0x1000 | goThumbTracking     |
+
+Cells is a bulk-load property: columns are tab-delimited, rows are
+`\n`-delimited.  Cell is an individual update: `"col,row,value"`.
+
 ## String Encoding
 
 - Strings in the protocol are always double-quoted.