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/*

 * tkScrollbar.c --

 *

 *      This module implements a scrollbar widgets for the Tk

 *      toolkit.  A scrollbar displays a slider and two arrows;

 *      mouse clicks on features within the scrollbar cause

 *      scrolling commands to be invoked.

 *

 * Copyright (c) 1990-1994 The Regents of the University of California.

 * Copyright (c) 1994-1997 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * RCS: @(#) $Id: tkScrollbar.c,v 1.1.1.1 2002-01-16 10:25:52 markom Exp $

 */

#include "tkPort.h"

#include "tkScrollbar.h"

#include "default.h"

/*

 * Information used for argv parsing.

 */

Tk_ConfigSpec tkpScrollbarConfigSpecs[] = {

    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",

        DEF_SCROLLBAR_ACTIVE_BG_COLOR, Tk_Offset(TkScrollbar, activeBorder),

        TK_CONFIG_COLOR_ONLY},

    {TK_CONFIG_BORDER, "-activebackground", "activeBackground", "Foreground",

        DEF_SCROLLBAR_ACTIVE_BG_MONO, Tk_Offset(TkScrollbar, activeBorder),

        TK_CONFIG_MONO_ONLY},

    {TK_CONFIG_RELIEF, "-activerelief", "activeRelief", "Relief",

        DEF_SCROLLBAR_ACTIVE_RELIEF, Tk_Offset(TkScrollbar, activeRelief), 0},

    {TK_CONFIG_BORDER, "-background", "background", "Background",

        DEF_SCROLLBAR_BG_COLOR, Tk_Offset(TkScrollbar, bgBorder),

        TK_CONFIG_COLOR_ONLY},

    {TK_CONFIG_BORDER, "-background", "background", "Background",

        DEF_SCROLLBAR_BG_MONO, Tk_Offset(TkScrollbar, bgBorder),

        TK_CONFIG_MONO_ONLY},

    {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,

        (char *) NULL, 0, 0},

    {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,

        (char *) NULL, 0, 0},

    {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",

        DEF_SCROLLBAR_BORDER_WIDTH, Tk_Offset(TkScrollbar, borderWidth), 0},

    {TK_CONFIG_STRING, "-command", "command", "Command",

        DEF_SCROLLBAR_COMMAND, Tk_Offset(TkScrollbar, command),

        TK_CONFIG_NULL_OK},

    {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",

        DEF_SCROLLBAR_CURSOR, Tk_Offset(TkScrollbar, cursor), TK_CONFIG_NULL_OK},

    {TK_CONFIG_PIXELS, "-elementborderwidth", "elementBorderWidth",

        "BorderWidth", DEF_SCROLLBAR_EL_BORDER_WIDTH,

        Tk_Offset(TkScrollbar, elementBorderWidth), 0},

    {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",

        "HighlightBackground", DEF_SCROLLBAR_HIGHLIGHT_BG,

        Tk_Offset(TkScrollbar, highlightBgColorPtr), 0},

    {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",

        DEF_SCROLLBAR_HIGHLIGHT,

        Tk_Offset(TkScrollbar, highlightColorPtr), 0},

    {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",

        "HighlightThickness",

        DEF_SCROLLBAR_HIGHLIGHT_WIDTH, Tk_Offset(TkScrollbar, highlightWidth), 0},

    {TK_CONFIG_BOOLEAN, "-jump", "jump", "Jump",

        DEF_SCROLLBAR_JUMP, Tk_Offset(TkScrollbar, jump), 0},

    {TK_CONFIG_UID, "-orient", "orient", "Orient",

        DEF_SCROLLBAR_ORIENT, Tk_Offset(TkScrollbar, orientUid), 0},

    {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",

        DEF_SCROLLBAR_RELIEF, Tk_Offset(TkScrollbar, relief), 0},

    {TK_CONFIG_INT, "-repeatdelay", "repeatDelay", "RepeatDelay",

        DEF_SCROLLBAR_REPEAT_DELAY, Tk_Offset(TkScrollbar, repeatDelay), 0},

    {TK_CONFIG_INT, "-repeatinterval", "repeatInterval", "RepeatInterval",

        DEF_SCROLLBAR_REPEAT_INTERVAL, Tk_Offset(TkScrollbar, repeatInterval), 0},

    {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",

        DEF_SCROLLBAR_TAKE_FOCUS, Tk_Offset(TkScrollbar, takeFocus),

        TK_CONFIG_NULL_OK},

    {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",

        DEF_SCROLLBAR_TROUGH_COLOR, Tk_Offset(TkScrollbar, troughColorPtr),

        TK_CONFIG_COLOR_ONLY},

    {TK_CONFIG_COLOR, "-troughcolor", "troughColor", "Background",

        DEF_SCROLLBAR_TROUGH_MONO, Tk_Offset(TkScrollbar, troughColorPtr),

        TK_CONFIG_MONO_ONLY},

    {TK_CONFIG_PIXELS, "-width", "width", "Width",

        DEF_SCROLLBAR_WIDTH, Tk_Offset(TkScrollbar, width), 0},

    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,

        (char *) NULL, 0, 0}

};

/*

 * Forward declarations for procedures defined later in this file:

 */

static int              ConfigureScrollbar _ANSI_ARGS_((Tcl_Interp *interp,

                            TkScrollbar *scrollPtr, int argc, char **argv,

                            int flags));

static void             ScrollbarCmdDeletedProc _ANSI_ARGS_((

                            ClientData clientData));

static int              ScrollbarWidgetCmd _ANSI_ARGS_((ClientData clientData,

                            Tcl_Interp *, int argc, char **argv));

/*

 *--------------------------------------------------------------

 *

 * Tk_ScrollbarCmd --

 *

 *      This procedure is invoked to process the "scrollbar" Tcl

 *      command.  See the user documentation for details on what

 *      it does.

 *

 * Results:

 *      A standard Tcl result.

 *

 * Side effects:

 *      See the user documentation.

 *

 *--------------------------------------------------------------

 */

int

Tk_ScrollbarCmd(clientData, interp, argc, argv)

    ClientData clientData;      /* Main window associated with

                                 * interpreter. */

    Tcl_Interp *interp;         /* Current interpreter. */

    int argc;                   /* Number of arguments. */

    char **argv;                /* Argument strings. */

{

    Tk_Window tkwin = (Tk_Window) clientData;

    register TkScrollbar *scrollPtr;

    Tk_Window new;

    if (argc < 2) {

        Tcl_AppendResult(interp, "wrong # args: should be \"",

                argv[0], " pathName ?options?\"", (char *) NULL);

        return TCL_ERROR;

    }

    new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);

    if (new == NULL) {

        return TCL_ERROR;

    }

    Tk_SetClass(new, "Scrollbar");

    scrollPtr = TkpCreateScrollbar(new);

    TkSetClassProcs(new, &tkpScrollbarProcs, (ClientData) scrollPtr);

    /*

     * Initialize fields that won't be initialized by ConfigureScrollbar,

     * or which ConfigureScrollbar expects to have reasonable values

     * (e.g. resource pointers).

     */

    scrollPtr->tkwin = new;

    scrollPtr->display = Tk_Display(new);

    scrollPtr->interp = interp;

    scrollPtr->widgetCmd = Tcl_CreateCommand(interp,

            Tk_PathName(scrollPtr->tkwin), ScrollbarWidgetCmd,

            (ClientData) scrollPtr, ScrollbarCmdDeletedProc);

    scrollPtr->orientUid = NULL;

    scrollPtr->vertical = 0;

    scrollPtr->width = 0;

    scrollPtr->command = NULL;

    scrollPtr->commandSize = 0;

    scrollPtr->repeatDelay = 0;

    scrollPtr->repeatInterval = 0;

    scrollPtr->borderWidth = 0;

    scrollPtr->bgBorder = NULL;

    scrollPtr->activeBorder = NULL;

    scrollPtr->troughColorPtr = NULL;

    scrollPtr->relief = TK_RELIEF_FLAT;

    scrollPtr->highlightWidth = 0;

    scrollPtr->highlightBgColorPtr = NULL;

    scrollPtr->highlightColorPtr = NULL;

    scrollPtr->inset = 0;

    scrollPtr->elementBorderWidth = -1;

    scrollPtr->arrowLength = 0;

    scrollPtr->sliderFirst = 0;

    scrollPtr->sliderLast = 0;

    scrollPtr->activeField = 0;

    scrollPtr->activeRelief = TK_RELIEF_RAISED;

    scrollPtr->totalUnits = 0;

    scrollPtr->windowUnits = 0;

    scrollPtr->firstUnit = 0;

    scrollPtr->lastUnit = 0;

    scrollPtr->firstFraction = 0.0;

    scrollPtr->lastFraction = 0.0;

    scrollPtr->cursor = None;

    scrollPtr->takeFocus = NULL;

    scrollPtr->flags = 0;

    if (ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2, 0) != TCL_OK) {

        Tk_DestroyWindow(scrollPtr->tkwin);

        return TCL_ERROR;

    }

    interp->result = Tk_PathName(scrollPtr->tkwin);

    return TCL_OK;

}

/*

 *--------------------------------------------------------------

 *

 * ScrollbarWidgetCmd --

 *

 *      This procedure is invoked to process the Tcl command

 *      that corresponds to a widget managed by this module.

 *      See the user documentation for details on what it does.

 *

 * Results:

 *      A standard Tcl result.

 *

 * Side effects:

 *      See the user documentation.

 *

 *--------------------------------------------------------------

 */

static int

ScrollbarWidgetCmd(clientData, interp, argc, argv)

    ClientData clientData;      /* Information about scrollbar

                                         * widget. */

    Tcl_Interp *interp;                 /* Current interpreter. */

    int argc;                           /* Number of arguments. */

    char **argv;                        /* Argument strings. */

{

    register TkScrollbar *scrollPtr = (TkScrollbar *) clientData;

    int result = TCL_OK;

    size_t length;

    int c;

    if (argc < 2) {

        Tcl_AppendResult(interp, "wrong # args: should be \"",

                argv[0], " option ?arg arg ...?\"", (char *) NULL);

        return TCL_ERROR;

    }

    Tcl_Preserve((ClientData) scrollPtr);

    c = argv[1][0];

    length = strlen(argv[1]);

    if ((c == 'a') && (strncmp(argv[1], "activate", length) == 0)) {

        int oldActiveField;

        if (argc == 2) {

            switch (scrollPtr->activeField) {

                case TOP_ARROW:         interp->result = "arrow1";      break;

                case SLIDER:            interp->result = "slider";      break;

                case BOTTOM_ARROW:      interp->result = "arrow2";      break;

            }

            goto done;

        }

        if (argc != 3) {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " activate element\"", (char *) NULL);

            goto error;

        }

        c = argv[2][0];

        length = strlen(argv[2]);

        oldActiveField = scrollPtr->activeField;

        if ((c == 'a') && (strcmp(argv[2], "arrow1") == 0)) {

            scrollPtr->activeField = TOP_ARROW;

        } else if ((c == 'a') && (strcmp(argv[2], "arrow2") == 0)) {

            scrollPtr->activeField = BOTTOM_ARROW;

        } else if ((c == 's') && (strncmp(argv[2], "slider", length) == 0)) {

            scrollPtr->activeField = SLIDER;

        } else {

            scrollPtr->activeField = OUTSIDE;

        }

        if (oldActiveField != scrollPtr->activeField) {

            TkScrollbarEventuallyRedraw(scrollPtr);

        }

    } else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)

            && (length >= 2)) {

        if (argc != 3) {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " cget option\"",

                    (char *) NULL);

            goto error;

        }

        result = Tk_ConfigureValue(interp, scrollPtr->tkwin,

                tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0);

    } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)

            && (length >= 2)) {

        if (argc == 2) {

            result = Tk_ConfigureInfo(interp, scrollPtr->tkwin,

                    tkpScrollbarConfigSpecs, (char *) scrollPtr,

                    (char *) NULL, 0);

        } else if (argc == 3) {

            result = Tk_ConfigureInfo(interp, scrollPtr->tkwin,

                    tkpScrollbarConfigSpecs, (char *) scrollPtr, argv[2], 0);

        } else {

            result = ConfigureScrollbar(interp, scrollPtr, argc-2, argv+2,

                    TK_CONFIG_ARGV_ONLY);

        }

    } else if ((c == 'd') && (strncmp(argv[1], "delta", length) == 0)) {

        int xDelta, yDelta, pixels, length;

        double fraction;

        if (argc != 4) {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " delta xDelta yDelta\"", (char *) NULL);

            goto error;

        }

        if ((Tcl_GetInt(interp, argv[2], &xDelta) != TCL_OK)

                || (Tcl_GetInt(interp, argv[3], &yDelta) != TCL_OK)) {

            goto error;

        }

        if (scrollPtr->vertical) {

            pixels = yDelta;

            length = Tk_Height(scrollPtr->tkwin) - 1

                    - 2*(scrollPtr->arrowLength + scrollPtr->inset);

        } else {

            pixels = xDelta;

            length = Tk_Width(scrollPtr->tkwin) - 1

                    - 2*(scrollPtr->arrowLength + scrollPtr->inset);

        }

        if (length == 0) {

            fraction = 0.0;

        } else {

            fraction = ((double) pixels / (double) length);

        }

        sprintf(interp->result, "%g", fraction);

    } else if ((c == 'f') && (strncmp(argv[1], "fraction", length) == 0)) {

        int x, y, pos, length;

        double fraction;

        if (argc != 4) {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " fraction x y\"", (char *) NULL);

            goto error;

        }

        if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)

                || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {

            goto error;

        }

        if (scrollPtr->vertical) {

            pos = y - (scrollPtr->arrowLength + scrollPtr->inset);

            length = Tk_Height(scrollPtr->tkwin) - 1

                    - 2*(scrollPtr->arrowLength + scrollPtr->inset);

        } else {

            pos = x - (scrollPtr->arrowLength + scrollPtr->inset);

            length = Tk_Width(scrollPtr->tkwin) - 1

                    - 2*(scrollPtr->arrowLength + scrollPtr->inset);

        }

        if (length == 0) {

            fraction = 0.0;

        } else {

            fraction = ((double) pos / (double) length);

        }

        if (fraction < 0) {

            fraction = 0;

        } else if (fraction > 1.0) {

            fraction = 1.0;

        }

        sprintf(interp->result, "%g", fraction);

    } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {

        if (argc != 2) {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " get\"", (char *) NULL);

            goto error;

        }

        if (scrollPtr->flags & NEW_STYLE_COMMANDS) {

            char first[TCL_DOUBLE_SPACE], last[TCL_DOUBLE_SPACE];

            Tcl_PrintDouble(interp, scrollPtr->firstFraction, first);

            Tcl_PrintDouble(interp, scrollPtr->lastFraction, last);

            Tcl_AppendResult(interp, first, " ", last, (char *) NULL);

        } else {

            sprintf(interp->result, "%d %d %d %d", scrollPtr->totalUnits,

                    scrollPtr->windowUnits, scrollPtr->firstUnit,

                    scrollPtr->lastUnit);

        }

    } else if ((c == 'i') && (strncmp(argv[1], "identify", length) == 0)) {

        int x, y, thing;

        if (argc != 4) {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " identify x y\"", (char *) NULL);

            goto error;

        }

        if ((Tcl_GetInt(interp, argv[2], &x) != TCL_OK)

                || (Tcl_GetInt(interp, argv[3], &y) != TCL_OK)) {

            goto error;

        }

        thing = TkpScrollbarPosition(scrollPtr, x,y);

        switch (thing) {

            case TOP_ARROW:     interp->result = "arrow1";      break;

            case TOP_GAP:       interp->result = "trough1";     break;

            case SLIDER:        interp->result = "slider";      break;

            case BOTTOM_GAP:    interp->result = "trough2";     break;

            case BOTTOM_ARROW:  interp->result = "arrow2";      break;

        }

    } else if ((c == 's') && (strncmp(argv[1], "set", length) == 0)) {

        int totalUnits, windowUnits, firstUnit, lastUnit;

        if (argc == 4) {

            double first, last;

            if (Tcl_GetDouble(interp, argv[2], &first) != TCL_OK) {

                goto error;

            }

            if (Tcl_GetDouble(interp, argv[3], &last) != TCL_OK) {

                goto error;

            }

            if (first < 0) {

                scrollPtr->firstFraction = 0;

            } else if (first > 1.0) {

                scrollPtr->firstFraction = 1.0;

            } else {

                scrollPtr->firstFraction = first;

            }

            if (last < scrollPtr->firstFraction) {

                scrollPtr->lastFraction = scrollPtr->firstFraction;

            } else if (last > 1.0) {

                scrollPtr->lastFraction = 1.0;

            } else {

                scrollPtr->lastFraction = last;

            }

            scrollPtr->flags |= NEW_STYLE_COMMANDS;

        } else if (argc == 6) {

            if (Tcl_GetInt(interp, argv[2], &totalUnits) != TCL_OK) {

                goto error;

            }

            if (totalUnits < 0) {

                totalUnits = 0;

            }

            if (Tcl_GetInt(interp, argv[3], &windowUnits) != TCL_OK) {

                goto error;

            }

            if (windowUnits < 0) {

                windowUnits = 0;

            }

            if (Tcl_GetInt(interp, argv[4], &firstUnit) != TCL_OK) {

                goto error;

            }

            if (Tcl_GetInt(interp, argv[5], &lastUnit) != TCL_OK) {

                goto error;

            }

            if (totalUnits > 0) {

                if (lastUnit < firstUnit) {

                    lastUnit = firstUnit;

                }

            } else {

                firstUnit = lastUnit = 0;

            }

            scrollPtr->totalUnits = totalUnits;

            scrollPtr->windowUnits = windowUnits;

            scrollPtr->firstUnit = firstUnit;

            scrollPtr->lastUnit = lastUnit;

            if (scrollPtr->totalUnits == 0) {

                scrollPtr->firstFraction = 0.0;

                scrollPtr->lastFraction = 1.0;

            } else {

                scrollPtr->firstFraction = ((double) firstUnit)/totalUnits;

                scrollPtr->lastFraction = ((double) (lastUnit+1))/totalUnits;

            }

            scrollPtr->flags &= ~NEW_STYLE_COMMANDS;

        } else {

            Tcl_AppendResult(interp, "wrong # args: should be \"",

                    argv[0], " set firstFraction lastFraction\" or \"",

                    argv[0],

                    " set totalUnits windowUnits firstUnit lastUnit\"",

                    (char *) NULL);

            goto error;

        }

        TkpComputeScrollbarGeometry(scrollPtr);

        TkScrollbarEventuallyRedraw(scrollPtr);

    } else {

        Tcl_AppendResult(interp, "bad option \"", argv[1],

                "\": must be activate, cget, configure, delta, fraction, ",

                "get, identify, or set", (char *) NULL);

        goto error;

    }

    done:

    Tcl_Release((ClientData) scrollPtr);

    return result;

    error:

    Tcl_Release((ClientData) scrollPtr);

    return TCL_ERROR;

}

/*

 *----------------------------------------------------------------------

 *

 * ConfigureScrollbar --

 *

 *      This procedure is called to process an argv/argc list, plus

 *      the Tk option database, in order to configure (or

 *      reconfigure) a scrollbar widget.

 *

 * Results:

 *      The return value is a standard Tcl result.  If TCL_ERROR is

 *      returned, then interp->result contains an error message.

 *

 * Side effects:

 *      Configuration information, such as colors, border width,

 *      etc. get set for scrollPtr;  old resources get freed,

 *      if there were any.

 *

 *----------------------------------------------------------------------

 */

static int

ConfigureScrollbar(interp, scrollPtr, argc, argv, flags)

    Tcl_Interp *interp;                 /* Used for error reporting. */

    register TkScrollbar *scrollPtr;    /* Information about widget;  may or

                                         * may not already have values for

                                         * some fields. */

    int argc;                           /* Number of valid entries in argv. */

    char **argv;                        /* Arguments. */

    int flags;                          /* Flags to pass to

                                         * Tk_ConfigureWidget. */

{

    size_t length;

    if (Tk_ConfigureWidget(interp, scrollPtr->tkwin, tkpScrollbarConfigSpecs,

            argc, argv, (char *) scrollPtr, flags) != TCL_OK) {

        return TCL_ERROR;

    }

    /*

     * A few options need special processing, such as parsing the

     * orientation or setting the background from a 3-D border.

     */

    length = strlen(scrollPtr->orientUid);

    if (strncmp(scrollPtr->orientUid, "vertical", length) == 0) {

        scrollPtr->vertical = 1;

    } else if (strncmp(scrollPtr->orientUid, "horizontal", length) == 0) {

        scrollPtr->vertical = 0;

    } else {

        Tcl_AppendResult(interp, "bad orientation \"", scrollPtr->orientUid,

                "\": must be vertical or horizontal", (char *) NULL);

        return TCL_ERROR;

    }

    if (scrollPtr->command != NULL) {

        scrollPtr->commandSize = strlen(scrollPtr->command);

    } else {

        scrollPtr->commandSize = 0;

    }

    /*

     * Configure platform specific options.

     */

    TkpConfigureScrollbar(scrollPtr);

    /*

     * Register the desired geometry for the window (leave enough space

     * for the two arrows plus a minimum-size slider, plus border around

     * the whole window, if any).  Then arrange for the window to be

     * redisplayed.

     */

    TkpComputeScrollbarGeometry(scrollPtr);

    TkScrollbarEventuallyRedraw(scrollPtr);

    return TCL_OK;

}

/*

 *--------------------------------------------------------------

 *

 * TkScrollbarEventProc --

 *

 *      This procedure is invoked by the Tk dispatcher for various

 *      events on scrollbars.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      When the window gets deleted, internal structures get

 *      cleaned up.  When it gets exposed, it is redisplayed.

 *

 *--------------------------------------------------------------

 */

void

TkScrollbarEventProc(clientData, eventPtr)

    ClientData clientData;      /* Information about window. */

    XEvent *eventPtr;           /* Information about event. */

{

    TkScrollbar *scrollPtr = (TkScrollbar *) clientData;

    if ((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) {

        TkScrollbarEventuallyRedraw(scrollPtr);

    } else if (eventPtr->type == DestroyNotify) {

        TkpDestroyScrollbar(scrollPtr);

        if (scrollPtr->tkwin != NULL) {

            scrollPtr->tkwin = NULL;

            Tcl_DeleteCommandFromToken(scrollPtr->interp,

                    scrollPtr->widgetCmd);

        }

        if (scrollPtr->flags & REDRAW_PENDING) {

            Tcl_CancelIdleCall(TkpDisplayScrollbar, (ClientData) scrollPtr);

        }

        /*