A lightweight, low-overhead Windows grid control implemented as a Win32 custom control DLL. Provides in-place cell editing, multiple column types, and a message-based API compatible with both C/Win32 and Clarion applications.

Based on David Hillard's award-winning 2002 CodeGuru article "Win32 Grid Control with Low Overhead (BABYGRID)", heavily rewritten and extended by David MacDermot.

• Multiple column types: text edit, combobox, checkbox, button, hyperlink, and image
• Selection modes: single cell, full row, or row header
• In-place cell editing with keyboard and mouse navigation
• Dynamic rows and columns: add, insert, delete at runtime
• Cell protection (read-only) with visual indicator
• Custom styling: fonts, colors, gridline styles, column widths, row heights
• Text alignment: left, right, or auto (general)
• WM_NOTIFY notifications for selection, edit, focus, and key events
• Double-buffered rendering for flicker-free display
• Clarion language bindings included

SimpleGrid/
├── simpleGrid.c          # Core grid control implementation (~4,700 lines)
├── simpleGrid.h          # Public API — messages, structures, constants
├── SimpleGrid.clw        # Clarion procedure wrappers
├── SimpleGrid.inc        # Clarion EQUATEs and GROUP definitions
├── ExampleSimpleGrid.clw # Clarion usage example
├── ExampleSimpleGrid.cwproj
├── ExampleSimpleGrid.sln
├── Grids/
│   └── SimpleGrid/
│       ├── main.c        # Win32 C demo application (5 grid examples)
│       ├── dllmain.c     # DLL entry point
│       ├── main.h / main.rc / resource.h
│       └── *.bmp / *.ico # Demo resources
├── map/                  # Linker map output (build artifact)
└── obj/                  # Compiled object files (build artifact)

• Visual Studio 2012 or later (Win32 C compiler)
• Pelles C 13.x or later (Win32 C compiler)
• Clarion (optional, for Clarion bindings and example)

Open ExampleSimpleGrid.sln and build in Release or Debug configuration for the Win32 platform.

The output DLL (SimpleGrid.dll) and import library (SimpleGrid.lib) will be placed in the project output directory.

Open ExampleSimpleGrid.cwproj in the Clarion IDE and build normally. The project links against SimpleGrid.lib.

#include "simpleGrid.h"

// The control window class is "SimpleGridCtl"
HWND hGrid = CreateWindowEx(
    WS_EX_CLIENTEDGE,
    TEXT("SimpleGridCtl"),
    NULL,
    WS_CHILD | WS_VISIBLE | WS_TABSTOP,
    x, y, width, height,
    hParent, (HMENU)IDC_GRID, hInstance, NULL
);

SGCOLUMN col = {0};
col.dwType    = GCT_EDIT;
col.pszHeader = TEXT("Name");
col.pOptional = NULL;

SendMessage(hGrid, SG_ADDCOLUMN, 0, (LPARAM)&col);

SendMessage(hGrid, SG_ADDROW, 0, 0);

SGITEM item = {0};
item.col      = 0;
item.row      = 1;
item.pszVal   = TEXT("John Doe");

SendMessage(hGrid, SG_SETITEMTEXT, 0, (LPARAM)&item);

case WM_NOTIFY: {
    NMHDR *pNmhdr = (NMHDR *)lParam;
    if (pNmhdr->idFrom == IDC_GRID) {
        switch (pNmhdr->code) {
        case SGN_SELCHANGE:
            // selection changed
            break;
        case SGN_EDITEND:
            // cell edit finished
            break;
        }
    }
    break;
}

Include the bindings and call the wrapper procedures:

INCLUDE('SimpleGrid.inc'), ONCE

! Add a column
SGAddColumn(hGrid, GCT_EDIT, 'Name', 0)

! Add a row and set cell text
SGAddRow(hGrid)
SGSetItemText(hGrid, 0, 1, 'John Doe')

See simpleGrid.h for the full list of messages and structures.

// Column definition
typedef struct tagSGCOLUMN {
    DWORD  dwType;      // Column type (GCT_*)
    LPTSTR pszHeader;   // Header text
    LPVOID pOptional;   // Optional data (e.g. combobox items)
} SGCOLUMN, *PSGCOLUMN;

// Cell reference and value
typedef struct tagSGITEM {
    int    col;         // Zero-based column index
    int    row;         // One-based row index
    LPTSTR pszVal;      // Cell text value
} SGITEM, *PSGITEM;

// Notification data
typedef struct tagNMGRID {
    NMHDR hdr;
    int   col;
    int   row;
} NMGRID, *PNMGRID;

• Original concept: David Hillard — BABYGRID (CodeGuru, 2002)
• Rewrite and extensions: David MacDermot (versions 1.1 – 2.2)

See source file headers for original license terms.