Class: Teek::Interp

Inherits:
Object
  • Object
show all
Defined in:
ext/teek/tcltkbridge.c

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object

Interp#initialize(name=nil, opts={}) - Create Tcl interp and load Tk

Arguments:

name - Ignored (legacy compatibility)
opts - Options hash

Options:

:thread_timer_ms - Timer interval for thread-aware mainloop (default: 5)
                 Controls how often Ruby threads get a chance to run
                 during Tk.mainloop.

                 Tradeoffs:
                 - 1ms:  Very responsive threads, higher CPU when idle
                 - 5ms:  Good balance (default)
                 - 10ms: Lower CPU, slight thread latency
                 - 20ms: Minimal CPU, noticeable latency for threads
                 - 0:    Disable timer (threads won't run during mainloop)

Initialization order (verified empirically on Tcl/Tk 9.0.3):

  1. Tcl_FindExecutable - sets up internal paths (NOT stubbed)
  2. Tcl_CreateInterp - create interpreter (NOT stubbed)
  3. Tcl_InitStubs - bootstrap stubs table
  4. Set argc/argv/argv0 - Tk_Init reads these
  5. Tcl_Init - load Tcl runtime
  6. Tk_Init - load Tk runtime (NOT stubbed - must come BEFORE Tk_InitStubs!)
  7. Tk_InitStubs - bootstrap Tk stubs table (AFTER Tk_Init)

CRITICAL: Tk_Init before Tk_InitStubs. Tk_InitStubs internally calls Tk_Init if not already done, causing "window already exists" error if you then call Tk_Init yourself.



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# File 'ext/teek/tcltkbridge.c', line 307

static VALUE
interp_initialize(int argc, VALUE *argv, VALUE self)
{
    struct tcltk_interp *tip;
    const char *tcl_version;
    const char *tk_version;
    VALUE name, opts, val;

    TypedData_Get_Struct(self, struct tcltk_interp, &interp_type, tip);

    /* Parse legacy (name, opts) or new (opts) argument forms */
    rb_scan_args(argc, argv, "02", &name, &opts);
    /* name is ignored - kept for legacy compatibility */

    /* Check for options in opts hash */
    if (!NIL_P(opts) && TYPE(opts) == T_HASH) {
        val = rb_hash_aref(opts, ID2SYM(rb_intern("thread_timer_ms")));
        if (!NIL_P(val)) {
            int ms = NUM2INT(val);
            if (ms < 0) {
                rb_raise(rb_eArgError, "thread_timer_ms must be >= 0 (got %d)", ms);
            }
            tip->timer_interval_ms = ms;
        }
    }

    /* 1. Tell Tcl where to find itself (once per process) */
    if (!tcl_stubs_initialized) {
        find_executable_bootstrap("ruby");
    }

    /* 2. Create Tcl interpreter (using bootstrap to handle Tcl 8.6) */
    tip->interp = create_interp_bootstrap();
    if (tip->interp == NULL) {
        rb_raise(eTclError, "failed to create Tcl interpreter");
    }

    /* 3. Initialize Tcl stubs - MUST be before any other Tcl calls */
    tcl_version = Tcl_InitStubs(tip->interp, TCL_VERSION, 0);
    if (tcl_version == NULL) {
        const char *err = Tcl_GetStringResult(tip->interp);
        Tcl_DeleteInterp(tip->interp);
        tip->interp = NULL;
        rb_raise(eTclError, "Tcl_InitStubs failed: %s", err);
    }

    /* 4. Set up argc/argv/argv0 before Tcl_Init (required for proper init) */
    Tcl_Eval(tip->interp, "set argc 0; set argv {}; set argv0 tcltkbridge");

    /* 5. Initialize Tcl runtime */
    if (Tcl_Init(tip->interp) != TCL_OK) {
        const char *err = Tcl_GetStringResult(tip->interp);
        Tcl_DeleteInterp(tip->interp);
        tip->interp = NULL;
        rb_raise(eTclError, "Tcl_Init failed: %s", err);
    }

    /* 6. Initialize Tk runtime - must come BEFORE Tk_InitStubs */
    if (Tk_Init(tip->interp) != TCL_OK) {
        const char *err = Tcl_GetStringResult(tip->interp);
        Tcl_DeleteInterp(tip->interp);
        tip->interp = NULL;
        rb_raise(eTclError, "Tk_Init failed: %s", err);
    }

    /* Hide the Tk console if it was auto-created during Tk_Init.
     * On macOS/Windows, Tk may create a console window depending on
     * how the process was launched. "catch" handles Linux where the
     * console command does not exist. */
    Tcl_Eval(tip->interp, "catch {console hide}");

    /* 7. Initialize Tk stubs - after Tk_Init */
    tk_version = Tk_InitStubs(tip->interp, TK_VERSION, 0);
    if (tk_version == NULL) {
        const char *err = Tcl_GetStringResult(tip->interp);
        Tcl_DeleteInterp(tip->interp);
        tip->interp = NULL;
        rb_raise(eTclError, "Tk_InitStubs failed: %s", err);
    }

    tcl_stubs_initialized = 1;

    /* 8. Register Tcl commands for Ruby integration */
    Tcl_CreateObjCommand(tip->interp, "ruby_callback",
                         ruby_callback_proc, (ClientData)tip, NULL);
    Tcl_CreateObjCommand(tip->interp, "ruby",
                         ruby_eval_proc, (ClientData)tip, NULL);
    Tcl_CreateObjCommand(tip->interp, "ruby_eval",
                         ruby_eval_proc, (ClientData)tip, NULL);

    /* 9. Register callback for when Tcl deletes this interpreter */
    Tcl_CallWhenDeleted(tip->interp, interp_deleted_callback, (ClientData)tip);

    /* 10. Track this instance for multi-interp safety checks */
    rb_ary_push(live_instances, self);

    /* 11. Store the main thread ID for cross-thread event queuing */
    tip->main_thread_id = Tcl_GetCurrentThread();

    return self;
}

Class Method Details

.instance_count ⇒ Object

TclTkIp.instance_count - Number of live interpreter instances



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# File 'ext/teek/tcltkbridge.c', line 1385

static VALUE
tcltkip_instance_count(VALUE klass)
{
    return LONG2NUM(RARRAY_LEN(live_instances));
}

.instances ⇒ Object

TclTkIp.instances - Array of live interpreter instances



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# File 'ext/teek/tcltkbridge.c', line 1395

static VALUE
tcltkip_instances(VALUE klass)
{
    return rb_ary_dup(live_instances);
}

Instance Method Details

#callback_ids ⇒ Object

Interp#callback_ids - Currently registered callback id strings (test/introspection use: asserting exactly which ids survive a release, not just how many)



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# File 'ext/teek/tcltkbridge.c', line 593

static VALUE
interp_callback_ids(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    return rb_funcall(tip->callbacks, rb_intern("keys"), 0);
}

#coords_to_window(root_x, root_y) ⇒ Object

Interp#coords_to_window(root_x, root_y)

Find which window contains the given screen coordinates (hit testing).

Arguments:

root_x - X coordinate in root window (screen) coordinates
root_y - Y coordinate in root window (screen) coordinates

Returns window path string, or nil if no Tk window at that location.

See: https://manpages.ubuntu.com/manpages/kinetic/man3/Tk_CoordsToWindow.3tk.html



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# File 'ext/teek/tkwin.c', line 159

static VALUE
interp_coords_to_window(VALUE self, VALUE root_x, VALUE root_y)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_Window mainWin;
    Tk_Window foundWin;
    const char *pathName;

    /* Get the main window for application reference */
    mainWin = Tk_MainWindow(tip->interp);
    if (!mainWin) {
        rb_raise(eTclError, "Tk not initialized (no main window)");
    }

    /* Find window at coordinates */
    foundWin = Tk_CoordsToWindow(NUM2INT(root_x), NUM2INT(root_y), mainWin);
    if (!foundWin) {
        return Qnil;
    }

    /* Get window path name */
    pathName = Tk_PathName(foundWin);
    if (!pathName) {
        return Qnil;
    }

    return rb_utf8_str_new_cstr(pathName);
}

#create_console ⇒ Object

Interp#create_console - Create Tk console window

Creates a console window for platforms without a real terminal. See: https://www.tcl-lang.org/man/tcl8.6/TkLib/CrtConsoleChan.htm



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# File 'ext/teek/tcltkbridge.c', line 1452

static VALUE
interp_create_console(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);

    /*
     * tcl_interactive is normally set by tclsh/wish at startup.
     * When embedding Tcl in Ruby, we must set it ourselves.
     * console.tcl checks this to decide whether to show the console window:
     * if 0, the window starts hidden (wm withdraw); if 1, it's shown.
     * See: https://github.com/tcltk/tk/blob/main/library/console.tcl#L144
     */
    if (Tcl_GetVar(tip->interp, "tcl_interactive", TCL_GLOBAL_ONLY) == NULL) {
        Tcl_SetVar(tip->interp, "tcl_interactive", "0", TCL_GLOBAL_ONLY);
    }

    Tk_InitConsoleChannels(tip->interp);

    if (Tk_CreateConsoleWindow(tip->interp) != TCL_OK) {
        rb_raise(eTclError, "failed to create console window: %s",
                 Tcl_GetStringResult(tip->interp));
    }

    return Qtrue;
}

#create_slave(*args) ⇒ Object

Interp#create_slave(name, safe=false) - Create child interpreter

Creates a Tcl slave interpreter with the given name. If safe is true, the slave runs in safe mode (restricted commands).



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# File 'ext/teek/tcltkbridge.c', line 1334

static VALUE
interp_create_slave(int argc, VALUE *argv, VALUE self)
{
    struct tcltk_interp *master = get_interp(self);
    struct tcltk_interp *slave;
    VALUE name, safemode, new_ip;
    int safe;
    Tcl_Interp *slave_interp;

    rb_scan_args(argc, argv, "11", &name, &safemode);
    StringValue(name);
    safe = RTEST(safemode) ? 1 : 0;

    /* Create the slave interpreter */
    slave_interp = Tcl_CreateSlave(master->interp, StringValueCStr(name), safe);
    if (slave_interp == NULL) {
        rb_raise(eTclError, "failed to create slave interpreter");
    }

    /* Wrap in a new TclTkIp Ruby object */
    new_ip = TypedData_Make_Struct(cInterp, struct tcltk_interp,
                                   &interp_type, slave);
    slave->interp = slave_interp;
    slave->deleted = 0;
    slave->callbacks = rb_hash_new();
    slave->thread_queue = rb_ary_new();
    slave->next_id = 1;
    slave->timer_interval_ms = DEFAULT_TIMER_INTERVAL_MS;
    slave->main_thread_id = Tcl_GetCurrentThread();

    /* Register Ruby integration commands in the slave */
    Tcl_CreateObjCommand(slave->interp, "ruby_callback",
                         ruby_callback_proc, (ClientData)slave, NULL);
    Tcl_CreateObjCommand(slave->interp, "ruby",
                         ruby_eval_proc, (ClientData)slave, NULL);
    Tcl_CreateObjCommand(slave->interp, "ruby_eval",
                         ruby_eval_proc, (ClientData)slave, NULL);

    /* Register callback for when Tcl deletes this interpreter */
    Tcl_CallWhenDeleted(slave->interp, interp_deleted_callback, (ClientData)slave);

    /* Track this instance */
    rb_ary_push(live_instances, new_ip);

    return new_ip;
}

#delete ⇒ Object

Interp#delete - Explicitly delete interpreter



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# File 'ext/teek/tcltkbridge.c', line 1063

static VALUE
interp_delete(VALUE self)
{
    struct tcltk_interp *tip;
    TypedData_Get_Struct(self, struct tcltk_interp, &interp_type, tip);

    if (tip->interp && !tip->deleted) {
        Tcl_DeleteInterp(tip->interp);
        tip->deleted = 1;
        /* Remove from live instances tracking */
        rb_ary_delete(live_instances, self);
    }

    return Qnil;
}

#deleted? ⇒ Boolean

Interp#deleted? - Check if interpreter was deleted

Returns:

  • (Boolean) 


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# File 'ext/teek/tcltkbridge.c', line 1035

static VALUE
interp_deleted_p(VALUE self)
{
    struct tcltk_interp *tip;
    TypedData_Get_Struct(self, struct tcltk_interp, &interp_type, tip);
    return (tip->deleted || tip->interp == NULL) ? Qtrue : Qfalse;
}

#do_one_event(*args) ⇒ Object

Interp#do_one_event(flags = ALL_EVENTS) - Process single event

Returns true if event was processed, false if nothing to do.



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# File 'ext/teek/tcltkbridge.c', line 1015

static VALUE
interp_do_one_event(int argc, VALUE *argv, VALUE self)
{
    int flags = TCL_ALL_EVENTS;
    int result;

    /* Optional flags argument */
    if (argc > 0) {
        flags = NUM2INT(argv[0]);
    }

    result = Tcl_DoOneEvent(flags);

    return result ? Qtrue : Qfalse;
}

#font_metrics(font_name) ⇒ Object

Interp#font_metrics(font_name)

Get font metrics using Tk_GetFontMetrics. Faster than querying via Tcl font metrics command.

Arguments:

font_name - Font description string (e.g., "Helvetica 12", "TkDefaultFont")

Returns Hash with:

:ascent   - Pixels from baseline to top of highest character
:descent  - Pixels from baseline to bottom of lowest character
:linespace - Total line height (ascent + descent)

See: https://www.tcl-lang.org/man/tcl9.0/TkLib/FontId.html



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# File 'ext/teek/tkfont.c', line 79

static VALUE
interp_font_metrics(VALUE self, VALUE font_name)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_Window mainWin;
    Tk_Font tkfont;
    Tk_FontMetrics fm;
    const char *font_str;
    VALUE result;

    StringValue(font_name);
    font_str = StringValueCStr(font_name);

    /* Get the main window for font allocation */
    mainWin = Tk_MainWindow(tip->interp);
    if (!mainWin) {
        rb_raise(eTclError, "Tk not initialized (no main window)");
    }

    /* Get the font */
    tkfont = Tk_GetFont(tip->interp, mainWin, font_str);
    if (!tkfont) {
        rb_raise(eTclError, "font not found: %s - %s",
                 font_str, Tcl_GetStringResult(tip->interp));
    }

    /* Get font metrics */
    Tk_GetFontMetrics(tkfont, &fm);

    /* Build result hash */
    result = rb_hash_new();
    rb_hash_aset(result, ID2SYM(rb_intern("ascent")), INT2NUM(fm.ascent));
    rb_hash_aset(result, ID2SYM(rb_intern("descent")), INT2NUM(fm.descent));
    rb_hash_aset(result, ID2SYM(rb_intern("linespace")), INT2NUM(fm.linespace));

    /* Release the font */
    Tk_FreeFont(tkfont);

    return result;
}

#get_root_coords(window_path) ⇒ Object

Interp#get_root_coords(window_path)

Get absolute screen coordinates of a window's upper-left corner.

Arguments:

window_path - Tk window path (e.g., ".", ".frame.button")

Returns [x, y] array of root window coordinates.

See: https://www.tcl-lang.org/man/tcl9.0/TkLib/GetRootCrd.html



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# File 'ext/teek/tkwin.c', line 76

static VALUE
interp_get_root_coords(VALUE self, VALUE window_path)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_Window mainWin;
    Tk_Window tkwin;
    int x, y;

    StringValue(window_path);

    /* Get the main window for hierarchy reference */
    mainWin = Tk_MainWindow(tip->interp);
    if (!mainWin) {
        rb_raise(eTclError, "Tk not initialized (no main window)");
    }

    /* Find the target window by path */
    tkwin = Tk_NameToWindow(tip->interp, StringValueCStr(window_path), mainWin);
    if (!tkwin) {
        rb_raise(eTclError, "window not found: %s", StringValueCStr(window_path));
    }

    /* Get root coordinates */
    Tk_GetRootCoords(tkwin, &x, &y);

    return rb_ary_new_from_args(2, INT2NUM(x), INT2NUM(y));
}

#mainloop ⇒ Object 



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# File 'ext/teek/tcltkbridge.c', line 1131

static VALUE
interp_mainloop(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);

    /* Start recurring timer if interval > 0 */
    if (tip->timer_interval_ms > 0) {
        Tcl_CreateTimerHandler(tip->timer_interval_ms, keepalive_timer_proc, (ClientData)tip);
    }

    while (Tk_GetNumMainWindows() > 0) {
        /* Process one event (timer ensures this returns periodically) */
        Tcl_DoOneEvent(TCL_ALL_EVENTS);

        /* Yield to other Ruby threads by releasing and reacquiring GVL */
        if (tip->timer_interval_ms > 0) {
            rb_thread_call_without_gvl(thread_yield_func, NULL, RUBY_UBF_IO, NULL);
        }

        /* Check for Ruby interrupts (Ctrl-C, etc) */
        rb_thread_check_ints();
    }

    return Qnil;
}

#measure_chars(*args) ⇒ Object

Interp#measure_chars(font_name, text, max_pixels, opts={})

Measure how many characters/bytes of text fit within a pixel width limit. Useful for text truncation, ellipsis, and line wrapping.

Arguments:

font_name  - Font description string (e.g., "Helvetica 12")
text       - Text string to measure
max_pixels - Maximum pixel width allowed (-1 for unlimited)
opts       - Optional hash:
           :partial_ok  - Allow partial character at boundary (default: false)
           :whole_words - Break only at word boundaries (default: false)
           :at_least_one - Always return at least one character (default: false)

Returns Hash with:

:bytes  - Number of bytes that fit within max_pixels
:width  - Actual pixel width of those bytes

See: https://www.tcl-lang.org/man/tcl9.0/TkLib/MeasureChar.html



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# File 'ext/teek/tkfont.c', line 142

static VALUE
interp_measure_chars(int argc, VALUE *argv, VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    VALUE font_name, text, max_pixels_val, opts;
    Tk_Window mainWin;
    Tk_Font tkfont;
    const char *font_str;
    const char *text_str;
    int max_pixels;
    int flags;
    int length;
    int num_bytes;
    VALUE result;

    rb_scan_args(argc, argv, "31", &font_name, &text, &max_pixels_val, &opts);

    StringValue(font_name);
    StringValue(text);

    font_str = StringValueCStr(font_name);
    text_str = StringValueCStr(text);
    max_pixels = NUM2INT(max_pixels_val);

    /* Parse flags from options */
    flags = 0;
    if (!NIL_P(opts) && TYPE(opts) == T_HASH) {
        VALUE val;
        val = rb_hash_aref(opts, ID2SYM(rb_intern("partial_ok")));
        if (RTEST(val)) flags |= TK_PARTIAL_OK;
        val = rb_hash_aref(opts, ID2SYM(rb_intern("whole_words")));
        if (RTEST(val)) flags |= TK_WHOLE_WORDS;
        val = rb_hash_aref(opts, ID2SYM(rb_intern("at_least_one")));
        if (RTEST(val)) flags |= TK_AT_LEAST_ONE;
    }

    /* Get the main window for font allocation */
    mainWin = Tk_MainWindow(tip->interp);
    if (!mainWin) {
        rb_raise(eTclError, "Tk not initialized (no main window)");
    }

    /* Get the font */
    tkfont = Tk_GetFont(tip->interp, mainWin, font_str);
    if (!tkfont) {
        rb_raise(eTclError, "font not found: %s - %s",
                 font_str, Tcl_GetStringResult(tip->interp));
    }

    /* Measure characters */
    num_bytes = Tk_MeasureChars(tkfont, text_str, (int)strlen(text_str),
                                 max_pixels, flags, &length);

    /* Release the font */
    Tk_FreeFont(tkfont);

    /* Build result hash */
    result = rb_hash_new();
    rb_hash_aset(result, ID2SYM(rb_intern("bytes")), INT2NUM(num_bytes));
    rb_hash_aset(result, ID2SYM(rb_intern("width")), INT2NUM(length));

    return result;
}

#native_window_handle(window_path) ⇒ Object

Interp#native_window_handle(window_path)

Returns the platform-native window handle for SDL2 embedding.

macOS:   NSWindow* (via Tk_MacOSXGetNSWindowForDrawable)
X11:     X Window ID (via Tk_WindowId)
Windows: HWND (via Tk_GetHWND)

The return value is an Integer suitable for passing to SDL_CreateWindowFrom. On macOS this is a pointer to an NSWindow object; on X11/Windows it's a window identifier.

The window must be mapped (visible) before calling this. Use update_idletasks first to ensure geometry is committed.



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# File 'ext/teek/tkwin.c', line 205

static VALUE
interp_native_window_handle(VALUE self, VALUE window_path)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_Window mainWin;
    Tk_Window tkwin;
    Drawable drawable;

    StringValue(window_path);

    mainWin = Tk_MainWindow(tip->interp);
    if (!mainWin) {
        rb_raise(eTclError, "Tk not initialized (no main window)");
    }

    tkwin = Tk_NameToWindow(tip->interp, StringValueCStr(window_path), mainWin);
    if (!tkwin) {
        rb_raise(eTclError, "window not found: %s", StringValueCStr(window_path));
    }

    /* Force the window to be mapped so we get a valid native handle */
    Tk_MakeWindowExist(tkwin);

    drawable = Tk_WindowId(tkwin);
    if (!drawable) {
        rb_raise(eTclError, "window has no native handle (not mapped?): %s",
                 StringValueCStr(window_path));
    }

#ifdef __APPLE__
    {
        /* macOS: convert Tk drawable to NSWindow* for SDL2 */
        void *nswindow = Tk_MacOSXGetNSWindowForDrawable(drawable);
        if (!nswindow) {
            rb_raise(eTclError, "could not get NSWindow for: %s",
                     StringValueCStr(window_path));
        }
        return ULL2NUM((uintptr_t)nswindow);
    }
#elif defined(_WIN32) || defined(__CYGWIN__)
    {
        /* Windows: convert to HWND */
        HWND hwnd = Tk_GetHWND(drawable);
        return ULL2NUM((uintptr_t)hwnd);
    }
#else
    /* X11: Drawable is already the X Window ID */
    return ULL2NUM((uintptr_t)drawable);
#endif
}

#on_main_thread? ⇒ Boolean

Check if current thread is the main Tcl thread

Returns:

  • (Boolean) 


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# File 'ext/teek/tcltkbridge.c', line 847

static VALUE
interp_on_main_thread_p(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    Tcl_ThreadId current = Tcl_GetCurrentThread();
    return (current == tip->main_thread_id) ? Qtrue : Qfalse;
}

#photo_blank(photo_path) ⇒ Object

Interp#photo_blank(photo_path)

Clear a photo image to transparent using Tk_PhotoBlank. Faster than setting all pixels manually.

Arguments:

photo_path - Tcl path of the photo image (e.g., "i00001")

Returns nil.

See: https://www.tcl-lang.org/man/tcl9.0/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 461

static VALUE
interp_photo_blank(VALUE self, VALUE photo_path)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_PhotoHandle photo;

    StringValue(photo_path);

    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    Tk_PhotoBlank(photo);

    return Qnil;
}

#photo_expand(photo_path, width_val, height_val) ⇒ Object

Interp#photo_expand(photo_path, width, height)

Expand a photo image to at least the given dimensions using Tk_PhotoExpand. Will not shrink the image if it is already larger.

Arguments:

photo_path - Tcl path of the photo image
width      - Minimum width in pixels
height     - Minimum height in pixels

Returns nil.

See: https://www.tcl-lang.org/man/tcl8.6/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 538

static VALUE
interp_photo_expand(VALUE self, VALUE photo_path, VALUE width_val, VALUE height_val)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_PhotoHandle photo;
    int width, height;

    StringValue(photo_path);
    width = NUM2INT(width_val);
    height = NUM2INT(height_val);

    if (width < 0 || height < 0) {
        rb_raise(rb_eArgError, "width and height must be non-negative");
    }

    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    if (Tk_PhotoExpand(tip->interp, photo, width, height) != TCL_OK) {
        rb_raise(eTclError, "Tk_PhotoExpand failed: %s",
                 Tcl_GetStringResult(tip->interp));
    }

    return Qnil;
}

#photo_get_image(*args) ⇒ Object

Interp#photo_get_image(photo_path, opts={})

Read pixel data from a photo image using Tk_PhotoGetImage.

Arguments:

photo_path - Tcl path of the photo image (e.g., "i00001")
opts       - Optional hash:
           :x, :y        - source offsets (default 0,0)
           :width, :height - region size (default: full image)
           :unpack       - if true, return flat array of integers
                           instead of binary string (default: false)

Returns a Hash with:

:data   - Binary string of RGBA pixels (4 bytes per pixel), OR
:pixels - Flat array of integers [r,g,b,a,r,g,b,a,...] if unpack: true
:width  - Width of returned data
:height - Height of returned data

See: https://www.tcl-lang.org/man/tcl9.0/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 294

static VALUE
interp_photo_get_image(int argc, VALUE *argv, VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    VALUE photo_path, opts, result;
    Tk_PhotoHandle photo;
    Tk_PhotoImageBlock block;
    int x_off, y_off, req_width, req_height;
    int img_width, img_height;
    int actual_width, actual_height;
    int do_unpack;
    unsigned char *src;
    int x, y;
    int r_off, g_off, b_off, a_off;

    rb_scan_args(argc, argv, "11", &photo_path, &opts);

    StringValue(photo_path);

    /* Find the photo image by Tcl path */
    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    /* Get image info */
    if (!Tk_PhotoGetImage(photo, &block)) {
        rb_raise(eTclError, "failed to get photo image data");
    }

    img_width = block.width;
    img_height = block.height;

    /* Parse options */
    x_off = 0;
    y_off = 0;
    req_width = img_width;
    req_height = img_height;
    do_unpack = 0;

    if (!NIL_P(opts) && TYPE(opts) == T_HASH) {
        VALUE val;
        val = rb_hash_aref(opts, ID2SYM(rb_intern("x")));
        if (!NIL_P(val)) x_off = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("y")));
        if (!NIL_P(val)) y_off = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("width")));
        if (!NIL_P(val)) req_width = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("height")));
        if (!NIL_P(val)) req_height = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("unpack")));
        if (RTEST(val)) do_unpack = 1;
    }

    /* Validate and clamp region */
    if (x_off < 0) x_off = 0;
    if (y_off < 0) y_off = 0;
    if (x_off >= img_width || y_off >= img_height) {
        rb_raise(rb_eArgError, "offset outside image bounds");
    }

    actual_width = req_width;
    actual_height = req_height;
    if (x_off + actual_width > img_width) actual_width = img_width - x_off;
    if (y_off + actual_height > img_height) actual_height = img_height - y_off;

    if (actual_width <= 0 || actual_height <= 0) {
        rb_raise(rb_eArgError, "invalid region size");
    }

    /* Get channel offsets from the block */
    r_off = block.offset[0];
    g_off = block.offset[1];
    b_off = block.offset[2];
    a_off = block.offset[3];

    /* Build result hash */
    result = rb_hash_new();
    rb_hash_aset(result, ID2SYM(rb_intern("width")), INT2NUM(actual_width));
    rb_hash_aset(result, ID2SYM(rb_intern("height")), INT2NUM(actual_height));

    if (do_unpack) {
        /* Return flat array of integers: [r,g,b,a,r,g,b,a,...] */
        long num_values = (long)actual_width * actual_height * 4;
        VALUE pixels = rb_ary_new_capa(num_values);

        for (y = 0; y < actual_height; y++) {
            src = block.pixelPtr + (y_off + y) * block.pitch + x_off * block.pixelSize;
            for (x = 0; x < actual_width; x++) {
                rb_ary_push(pixels, INT2FIX(src[r_off]));
                rb_ary_push(pixels, INT2FIX(src[g_off]));
                rb_ary_push(pixels, INT2FIX(src[b_off]));
                rb_ary_push(pixels, INT2FIX((block.pixelSize >= 4) ? src[a_off] : 255));
                src += block.pixelSize;
            }
        }

        rb_hash_aset(result, ID2SYM(rb_intern("pixels")), pixels);
    } else {
        /* Return binary string */
        VALUE data_str = rb_str_new(NULL, (long)actual_width * actual_height * 4);
        unsigned char *dst = (unsigned char *)RSTRING_PTR(data_str);

        for (y = 0; y < actual_height; y++) {
            src = block.pixelPtr + (y_off + y) * block.pitch + x_off * block.pixelSize;
            for (x = 0; x < actual_width; x++) {
                *dst++ = src[r_off];
                *dst++ = src[g_off];
                *dst++ = src[b_off];
                *dst++ = (block.pixelSize >= 4) ? src[a_off] : 255;
                src += block.pixelSize;
            }
        }

        rb_hash_aset(result, ID2SYM(rb_intern("data")), data_str);
    }

    return result;
}

#photo_get_pixel(photo_path, x_val, y_val) ⇒ Object

Interp#photo_get_pixel(photo_path, x, y)

Read a single pixel from a photo image using Tk_PhotoGetImage. Faster than going through Tcl's "$photo get x y" string parsing.

Arguments:

photo_path - Tcl path of the photo image
x          - X coordinate
y          - Y coordinate

Returns [r, g, b, a] array.

See: https://www.tcl-lang.org/man/tcl8.6/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 582

static VALUE
interp_photo_get_pixel(VALUE self, VALUE photo_path, VALUE x_val, VALUE y_val)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_PhotoHandle photo;
    Tk_PhotoImageBlock block;
    int x, y;
    unsigned char *src;
    int r_off, g_off, b_off, a_off;

    StringValue(photo_path);
    x = NUM2INT(x_val);
    y = NUM2INT(y_val);

    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    if (!Tk_PhotoGetImage(photo, &block)) {
        rb_raise(eTclError, "failed to get photo image data");
    }

    if (x < 0 || x >= block.width || y < 0 || y >= block.height) {
        rb_raise(rb_eArgError, "coordinates (%d, %d) outside image bounds (%d x %d)",
                 x, y, block.width, block.height);
    }

    r_off = block.offset[0];
    g_off = block.offset[1];
    b_off = block.offset[2];
    a_off = block.offset[3];

    src = block.pixelPtr + y * block.pitch + x * block.pixelSize;

    return rb_ary_new_from_args(4,
        INT2FIX(src[r_off]),
        INT2FIX(src[g_off]),
        INT2FIX(src[b_off]),
        INT2FIX((block.pixelSize >= 4) ? src[a_off] : 255));
}

#photo_get_size(photo_path) ⇒ Object

Interp#photo_get_size(photo_path)

Get dimensions of a photo image using Tk_PhotoGetSize. Faster than querying via Tcl commands.

Arguments:

photo_path - Tcl path of the photo image (e.g., "i00001")

Returns [width, height] array.

See: https://www.tcl-lang.org/man/tcl9.0/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 428

static VALUE
interp_photo_get_size(VALUE self, VALUE photo_path)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_PhotoHandle photo;
    int width, height;

    StringValue(photo_path);

    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    Tk_PhotoGetSize(photo, &width, &height);

    return rb_ary_new_from_args(2, INT2NUM(width), INT2NUM(height));
}

#photo_put_zoomed_block(*args) ⇒ Object

Interp#photo_put_zoomed_block(photo_path, pixel_data, width, height, opts={})

Fast pixel writes with zoom/subsample using Tk_PhotoPutZoomedBlock. Writes pixels and scales in a single operation - faster than put_block + copy.

Arguments:

photo_path - Tcl path of the photo image (e.g., "i00001")
pixel_data - Binary string of pixels (4 bytes per pixel)
width      - Source image width in pixels
height     - Source image height in pixels
opts       - Optional hash:
           :x, :y        - destination offsets (default 0,0)
           :zoom_x, :zoom_y       - zoom factors (default 1,1)
           :subsample_x, :subsample_y - subsample factors (default 1,1)
           :format       - :rgba (default) or :argb
           :composite    - :set (default, overwrite) or :overlay (alpha blend)

The pixel_data must be exactly width * height * 4 bytes. Zoom replicates pixels (zoom=3 makes each pixel 3x3). Subsample skips pixels (subsample=2 takes every other pixel).

Format :argb expects pixels packed as 0xAARRGGBB integers (little-endian: B,G,R,A bytes). This matches SDL2 and many graphics libraries.

See: https://www.tcl-lang.org/man/tcl8.6/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 152

static VALUE
interp_photo_put_zoomed_block(int argc, VALUE *argv, VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    VALUE photo_path, pixel_data, width_val, height_val, opts;
    Tk_PhotoHandle photo;
    Tk_PhotoImageBlock block;
    int width, height, x_off, y_off;
    int zoom_x, zoom_y, subsample_x, subsample_y;
    int dest_width, dest_height;
    int is_argb = 0;
    int comp_rule = TK_PHOTO_COMPOSITE_SET;
    long expected_size;

    rb_scan_args(argc, argv, "41", &photo_path, &pixel_data, &width_val, &height_val, &opts);

    StringValue(photo_path);
    StringValue(pixel_data);
    width = NUM2INT(width_val);
    height = NUM2INT(height_val);

    /* Validate dimensions */
    if (width <= 0 || height <= 0) {
        rb_raise(rb_eArgError, "width and height must be positive");
    }

    /* Validate data size */
    expected_size = (long)width * height * 4;
    if (RSTRING_LEN(pixel_data) != expected_size) {
        rb_raise(rb_eArgError, "pixel_data size mismatch: expected %ld bytes, got %ld",
                 expected_size, RSTRING_LEN(pixel_data));
    }

    /* Parse options with defaults */
    x_off = 0;
    y_off = 0;
    zoom_x = 1;
    zoom_y = 1;
    subsample_x = 1;
    subsample_y = 1;

    if (!NIL_P(opts) && TYPE(opts) == T_HASH) {
        VALUE val;
        val = rb_hash_aref(opts, ID2SYM(rb_intern("x")));
        if (!NIL_P(val)) x_off = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("y")));
        if (!NIL_P(val)) y_off = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("zoom_x")));
        if (!NIL_P(val)) zoom_x = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("zoom_y")));
        if (!NIL_P(val)) zoom_y = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("subsample_x")));
        if (!NIL_P(val)) subsample_x = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("subsample_y")));
        if (!NIL_P(val)) subsample_y = NUM2INT(val);
        val = rb_hash_aref(opts, ID2SYM(rb_intern("format")));
        if (!NIL_P(val) && TYPE(val) == T_SYMBOL) {
            if (rb_intern("argb") == SYM2ID(val)) {
                is_argb = 1;
            }
        }
        val = rb_hash_aref(opts, ID2SYM(rb_intern("composite")));
        if (!NIL_P(val) && TYPE(val) == T_SYMBOL) {
            if (rb_intern("overlay") == SYM2ID(val)) {
                comp_rule = TK_PHOTO_COMPOSITE_OVERLAY;
            }
        }
    }

    /* Validate zoom/subsample */
    if (zoom_x <= 0 || zoom_y <= 0) {
        rb_raise(rb_eArgError, "zoom factors must be positive");
    }
    if (subsample_x <= 0 || subsample_y <= 0) {
        rb_raise(rb_eArgError, "subsample factors must be positive");
    }

    /* Find the photo image by Tcl path */
    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    /* Set up the pixel block structure */
    block.pixelPtr = (unsigned char *)RSTRING_PTR(pixel_data);
    block.width = width;
    block.height = height;
    block.pitch = width * 4;
    block.pixelSize = 4;

    if (is_argb) {
        /* ARGB: 0xAARRGGBB stored little-endian as bytes: [B, G, R, A] */
        block.offset[0] = 2;  /* Red at byte 2 */
        block.offset[1] = 1;  /* Green at byte 1 */
        block.offset[2] = 0;  /* Blue at byte 0 */
        block.offset[3] = 3;  /* Alpha at byte 3 */
    } else {
        /* RGBA: [R, G, B, A] */
        block.offset[0] = 0;
        block.offset[1] = 1;
        block.offset[2] = 2;
        block.offset[3] = 3;
    }

    /* Calculate destination dimensions */
    dest_width = (width / subsample_x) * zoom_x;
    dest_height = (height / subsample_y) * zoom_y;

    /* Write pixels with zoom/subsample */
    if (Tk_PhotoPutZoomedBlock(tip->interp, photo, &block, x_off, y_off,
                               dest_width, dest_height,
                               zoom_x, zoom_y, subsample_x, subsample_y,
                               comp_rule) != TCL_OK) {
        rb_raise(eTclError, "Tk_PhotoPutZoomedBlock failed: %s",
                 Tcl_GetStringResult(tip->interp));
    }

    return Qnil;
}

#photo_set_size(photo_path, width_val, height_val) ⇒ Object

Interp#photo_set_size(photo_path, width, height)

Set the dimensions of a photo image using Tk_PhotoSetSize.

Arguments:

photo_path - Tcl path of the photo image
width      - New width in pixels
height     - New height in pixels

Returns nil.

See: https://www.tcl-lang.org/man/tcl8.6/TkLib/FindPhoto.htm



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# File 'ext/teek/tkphoto.c', line 494

static VALUE
interp_photo_set_size(VALUE self, VALUE photo_path, VALUE width_val, VALUE height_val)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_PhotoHandle photo;
    int width, height;

    StringValue(photo_path);
    width = NUM2INT(width_val);
    height = NUM2INT(height_val);

    if (width < 0 || height < 0) {
        rb_raise(rb_eArgError, "width and height must be non-negative");
    }

    photo = Tk_FindPhoto(tip->interp, StringValueCStr(photo_path));
    if (!photo) {
        rb_raise(eTclError, "photo image not found: %s", StringValueCStr(photo_path));
    }

    if (Tk_PhotoSetSize(tip->interp, photo, width, height) != TCL_OK) {
        rb_raise(eTclError, "Tk_PhotoSetSize failed: %s",
                 Tcl_GetStringResult(tip->interp));
    }

    return Qnil;
}

#queue_for_main(proc) ⇒ Object

Queue a proc to run on the main Tcl thread (fire-and-forget)



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# File 'ext/teek/tcltkbridge.c', line 827

static VALUE
interp_queue_for_main(VALUE self, VALUE proc)
{
    struct tcltk_interp *tip;
    VALUE cmd_hash;

    TypedData_Get_Struct(self, struct tcltk_interp, &interp_type, tip);

    if (tip->deleted || tip->interp == NULL) {
        rb_raise(eTclError, "interpreter has been deleted");
    }

    cmd_hash = rb_hash_new();
    rb_hash_aset(cmd_hash, ID2SYM(sym_type), sym_proc_val);
    rb_hash_aset(cmd_hash, ID2SYM(sym_proc), proc);

    return queue_command_internal(tip, cmd_hash, 0);
}

#register_callback(proc) ⇒ Object

Interp#register_callback(proc) - Store proc, return ID



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# File 'ext/teek/tcltkbridge.c', line 561

static VALUE
interp_register_callback(VALUE self, VALUE proc)
{
    struct tcltk_interp *tip = get_interp(self);
    char id_buf[32];
    VALUE id_str;

    snprintf(id_buf, sizeof(id_buf), "cb%lu", tip->next_id++);
    id_str = rb_utf8_str_new_cstr(id_buf);

    rb_hash_aset(tip->callbacks, id_str, proc);
    return id_str;
}

#safe? ⇒ Boolean

Interp#safe? - Check if interpreter is running in safe mode

Safe interpreters have restricted access to dangerous commands like file I/O, exec, socket, etc. Created via create_slave(name, true).

See: https://www.tcl-lang.org/man/tcl/TclCmd/interp.html#M30

Returns:

  • (Boolean) 


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# File 'ext/teek/tcltkbridge.c', line 1052

static VALUE
interp_safe_p(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    return Tcl_IsSafe(tip->interp) ? Qtrue : Qfalse;
}

#tcl_eval(script) ⇒ Object

Interp#tcl_eval(script) - Evaluate Tcl script string

Thread-safe: automatically routes through event queue if called from a background thread.



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# File 'ext/teek/tcltkbridge.c', line 862

static VALUE
interp_tcl_eval(VALUE self, VALUE script)
{
    struct tcltk_interp *tip = get_interp(self);
    Tcl_ThreadId current = Tcl_GetCurrentThread();
    const char *script_cstr;
    int result;

    StringValue(script);

    /* If on background thread, queue to main thread and wait */
    if (current != tip->main_thread_id) {
        VALUE cmd_hash = rb_hash_new();
        rb_hash_aset(cmd_hash, ID2SYM(sym_type), sym_eval);
        rb_hash_aset(cmd_hash, ID2SYM(sym_script), script);
        return queue_command_internal(tip, cmd_hash, 1);
    }

    /* On main thread - execute directly */
    script_cstr = StringValueCStr(script);
    result = Tcl_Eval(tip->interp, script_cstr);

    if (result != TCL_OK) {
        raise_tcl_error(tip->interp, result);
    }

    return rb_utf8_str_new_cstr(Tcl_GetStringResult(tip->interp));
}

#tcl_get_var(name) ⇒ Object

Interp#tcl_get_var(name) - Get Tcl variable value



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# File 'ext/teek/tcltkbridge.c', line 961

static VALUE
interp_tcl_get_var(VALUE self, VALUE name)
{
    struct tcltk_interp *tip = get_interp(self);
    const char *name_cstr;
    const char *value;

    StringValue(name);
    name_cstr = StringValueCStr(name);

    value = Tcl_GetVar(tip->interp, name_cstr, TCL_GLOBAL_ONLY);
    if (value == NULL) {
        return Qnil;
    }

    return rb_utf8_str_new_cstr(value);
}

#tcl_invoke(*args) ⇒ Object

Interp#tcl_invoke(*args) - Invoke Tcl command with args

This is the workhorse - creates widgets, configures them, etc. Thread-safe: automatically routes through event queue if called from a background thread.



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# File 'ext/teek/tcltkbridge.c', line 899

static VALUE
interp_tcl_invoke(int argc, VALUE *argv, VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    Tcl_ThreadId current = Tcl_GetCurrentThread();
    Tcl_Obj **objv;
    int i, result;
    VALUE ret;

    if (argc == 0) {
        rb_raise(rb_eArgError, "wrong number of arguments (given 0, expected 1+)");
    }

    /* If on background thread, queue to main thread and wait */
    if (current != tip->main_thread_id) {
        VALUE cmd_hash = rb_hash_new();
        VALUE args_ary = rb_ary_new4(argc, argv);
        rb_hash_aset(cmd_hash, ID2SYM(sym_type), sym_invoke);
        rb_hash_aset(cmd_hash, ID2SYM(sym_args), args_ary);
        return queue_command_internal(tip, cmd_hash, 1);
    }

    /* On main thread - execute directly */
    objv = ALLOCA_N(Tcl_Obj *, argc);
    for (i = 0; i < argc; i++) {
        VALUE arg = argv[i];
        const char *str;
        Tcl_Size len;

        if (NIL_P(arg)) {
            str = "";
            len = 0;
        } else {
            StringValue(arg);
            str = RSTRING_PTR(arg);
            len = RSTRING_LEN(arg);
        }

        objv[i] = Tcl_NewStringObj(str, len);
        Tcl_IncrRefCount(objv[i]);
    }

    /* Invoke the command */
    result = Tcl_EvalObjv(tip->interp, argc, objv, 0);

    /* Clean up Tcl objects */
    for (i = 0; i < argc; i++) {
        Tcl_DecrRefCount(objv[i]);
    }

    if (result != TCL_OK) {
        raise_tcl_error(tip->interp, result);
    }

    ret = rb_utf8_str_new_cstr(Tcl_GetStringResult(tip->interp));
    return ret;
}

#tcl_set_var(name, value) ⇒ Object

Interp#tcl_set_var(name, value) - Set Tcl variable



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# File 'ext/teek/tcltkbridge.c', line 983

static VALUE
interp_tcl_set_var(VALUE self, VALUE name, VALUE value)
{
    struct tcltk_interp *tip = get_interp(self);
    const char *name_cstr;
    const char *value_cstr;
    const char *result;

    StringValue(name);
    name_cstr = StringValueCStr(name);

    if (NIL_P(value)) {
        value_cstr = "";
    } else {
        StringValue(value);
        value_cstr = StringValueCStr(value);
    }

    result = Tcl_SetVar(tip->interp, name_cstr, value_cstr, TCL_GLOBAL_ONLY);
    if (result == NULL) {
        rb_raise(eTclError, "failed to set variable '%s'", name_cstr);
    }

    return value;
}

#tcl_version ⇒ Object

Interp#tcl_version / #tk_version - Get version strings



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# File 'ext/teek/tcltkbridge.c', line 1083

static VALUE
interp_tcl_version(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    const char *version = Tcl_GetVar(tip->interp, "tcl_patchLevel", TCL_GLOBAL_ONLY);
    if (version == NULL) {
        return Qnil;
    }
    return rb_utf8_str_new_cstr(version);
}

#thread_timer_ms ⇒ Object

Interp#thread_timer_ms / #thread_timer_ms= - Get/set timer interval



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# File 'ext/teek/tcltkbridge.c', line 1173

static VALUE
interp_get_thread_timer_ms(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    return INT2NUM(tip->timer_interval_ms);
}

#thread_timer_ms=(val) ⇒ Object 



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# File 'ext/teek/tcltkbridge.c', line 1180

static VALUE
interp_set_thread_timer_ms(VALUE self, VALUE val)
{
    struct tcltk_interp *tip = get_interp(self);
    int ms = NUM2INT(val);
    if (ms < 0) {
        rb_raise(rb_eArgError, "thread_timer_ms must be >= 0 (got %d)", ms);
    }
    tip->timer_interval_ms = ms;
    return val;
}

#tk_version ⇒ Object 



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# File 'ext/teek/tcltkbridge.c', line 1094

static VALUE
interp_tk_version(VALUE self)
{
    struct tcltk_interp *tip = get_interp(self);
    const char *version = Tcl_GetVar(tip->interp, "tk_patchLevel", TCL_GLOBAL_ONLY);
    if (version == NULL) {
        return Qnil;
    }
    return rb_utf8_str_new_cstr(version);
}

#unregister_callback(id) ⇒ Object

Interp#unregister_callback(id) - Remove proc by ID



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# File 'ext/teek/tcltkbridge.c', line 579

static VALUE
interp_unregister_callback(VALUE self, VALUE id)
{
    struct tcltk_interp *tip = get_interp(self);
    rb_hash_delete(tip->callbacks, id);
    return Qnil;
}

#window_geometry(window_path) ⇒ Object

Interp#window_geometry(window_path)

Get a window's screen position and interior size in one call.

Arguments:

window_path - Tk window path (e.g., ".", ".settings")

Returns [root_x, root_y, width, height].

root_x/root_y are absolute screen coordinates (Tk_GetRootCoords). width/height are the interior size excluding any border (Tk_Width/Tk_Height).



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# File 'ext/teek/tkwin.c', line 118

static VALUE
interp_window_geometry(VALUE self, VALUE window_path)
{
    struct tcltk_interp *tip = get_interp(self);
    Tk_Window mainWin;
    Tk_Window tkwin;
    int x, y;

    StringValue(window_path);

    mainWin = Tk_MainWindow(tip->interp);
    if (!mainWin) {
        rb_raise(eTclError, "Tk not initialized (no main window)");
    }

    tkwin = Tk_NameToWindow(tip->interp, StringValueCStr(window_path), mainWin);
    if (!tkwin) {
        rb_raise(eTclError, "window not found: %s", StringValueCStr(window_path));
    }

    Tk_GetRootCoords(tkwin, &x, &y);

    return rb_ary_new_from_args(4,
        INT2NUM(x), INT2NUM(y),
        INT2NUM(Tk_Width(tkwin)), INT2NUM(Tk_Height(tkwin)));
}