shared_source/c_tk_base_7_5_w_mods/tkwinbutton.c

/* $Header$ */

/* 
 * tkWinButton.c --
 *
 *      This file implements the Windows specific portion of the button
 *      widgets.
 *
 * Copyright (c) 1996-1998 by 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: tkwinbutton.c,v 1.1.1.1 2001/06/13 05:11:56 dtashley Exp $
 */

#define OEMRESOURCE
#include "tkWinInt.h"
#include "tkButton.h"

#include "resource.h"
  /* Necessary to load the TK_BUTTONS.
  */

/*
 * These macros define the base style flags for the different button types.
 */

#define LABEL_STYLE (BS_OWNERDRAW | WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS)
#define PUSH_STYLE (BS_OWNERDRAW | BS_PUSHBUTTON | WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS)
#define CHECK_STYLE (BS_OWNERDRAW | BS_CHECKBOX | WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS)
#define RADIO_STYLE (BS_OWNERDRAW | BS_RADIOBUTTON | WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS)

static DWORD buttonStyles[] = {
    LABEL_STYLE, PUSH_STYLE, CHECK_STYLE, RADIO_STYLE
};

/*
 * Declaration of Windows specific button structure.
 */

typedef struct WinButton {
    TkButton info;              /* Generic button info. */
    WNDPROC oldProc;            /* Old window procedure. */
    HWND hwnd;                  /* Current window handle. */
    Pixmap pixmap;              /* Bitmap for rendering the button. */
    DWORD style;                /* Window style flags. */
} WinButton;


/*
 * The following macro reverses the order of RGB bytes to convert
 * between RGBQUAD and COLORREF values.
 */

#define FlipColor(rgb) (RGB(GetBValue(rgb),GetGValue(rgb),GetRValue(rgb)))

/*
 * The following enumeration defines the meaning of the palette entries
 * in the "buttons" image used to draw checkbox and radiobutton indicators.
 */

enum {
    PAL_CHECK = 0,
    PAL_TOP_OUTER = 1,
    PAL_BOTTOM_OUTER = 2,
    PAL_BOTTOM_INNER = 3,
    PAL_INTERIOR = 4,
    PAL_TOP_INNER = 5,
    PAL_BACKGROUND = 6
};

/*
 * Cached information about the boxes bitmap, and the default border 
 * width for a button in string form for use in Tk_OptionSpec for 
 * the various button widget classes.
 */

typedef struct ThreadSpecificData { 
    BITMAPINFOHEADER *boxesPtr;   /* Information about the bitmap. */
    DWORD *boxesPalette;          /* Pointer to color palette. */
    LPSTR boxesBits;              /* Pointer to bitmap data. */
    DWORD boxHeight;              /* Height of each sub-image. */
    DWORD boxWidth ;              /* Width of each sub-image. */
    char defWidth[TCL_INTEGER_SPACE];
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;

/*
 * Declarations for functions defined in this file.
 */

static int              ButtonBindProc _ANSI_ARGS_((ClientData clientData,
                            Tcl_Interp *interp, XEvent *eventPtr,
                            Tk_Window tkwin, KeySym keySym));
static LRESULT CALLBACK ButtonProc _ANSI_ARGS_((HWND hwnd, UINT message,
                            WPARAM wParam, LPARAM lParam));
static DWORD            ComputeStyle _ANSI_ARGS_((WinButton* butPtr));
static Window           CreateProc _ANSI_ARGS_((Tk_Window tkwin,
                            Window parent, ClientData instanceData));
static void             InitBoxes _ANSI_ARGS_((void));

/*
 * The class procedure table for the button widgets.
 */

TkClassProcs tkpButtonProcs = { 
    CreateProc,                 /* createProc. */
    TkButtonWorldChanged,       /* geometryProc. */
    NULL                        /* modalProc. */ 
};


/*
 *----------------------------------------------------------------------
 *
 * InitBoxes --
 *
 *      This function load the Tk 3d button bitmap.  "buttons" is a 16 
 *      color bitmap that is laid out such that the top row contains 
 *      the 4 checkbox images, and the bottom row contains the radio 
 *      button images. Note that the bitmap is stored in bottom-up 
 *      format.  Also, the first seven palette entries are used to 
 *      identify the different parts of the bitmaps so we can do the 
 *      appropriate color mappings based on the current button colors.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Loads the "buttons" resource.
 *
 *----------------------------------------------------------------------
 */

static void
InitBoxes()
{
    /*
     * For DLLs like Tk, the HINSTANCE is the same as the HMODULE.
     */

    HMODULE module = (HINSTANCE) Tk_GetHINSTANCE();
    HRSRC hrsrc;
    HGLOBAL hblk;
    LPBITMAPINFOHEADER newBitmap;
    DWORD size;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    hrsrc = FindResource(module, (const char *)TK_BUTTONS, RT_BITMAP);
       /* Found experimentally that using the constant defined in 
       ** RESOURCE.H in the call above works as per Microsoft
       ** documentation.  Old line was:
       **     hrsrc = FindResource(module, "buttons", RT_BITMAP);
       ** Didn't work reliably with GUI build after code ported.
       ** Believe the call above accesses the resource correctly.
       */

    if (hrsrc) {
        hblk = LoadResource(module, hrsrc);
        tsdPtr->boxesPtr = (LPBITMAPINFOHEADER)LockResource(hblk);
    }

    /*
     * Copy the DIBitmap into writable memory.
     */

    if (tsdPtr->boxesPtr != NULL && !(tsdPtr->boxesPtr->biWidth % 4)
            && !(tsdPtr->boxesPtr->biHeight % 2)) {
        size = tsdPtr->boxesPtr->biSize + (1 << tsdPtr->boxesPtr->biBitCount) 
                * sizeof(RGBQUAD) + tsdPtr->boxesPtr->biSizeImage;
        newBitmap = (LPBITMAPINFOHEADER) ckalloc(size);
        memcpy(newBitmap, tsdPtr->boxesPtr, size);
        tsdPtr->boxesPtr = newBitmap;
        tsdPtr->boxWidth = tsdPtr->boxesPtr->biWidth / 4;
        tsdPtr->boxHeight = tsdPtr->boxesPtr->biHeight / 2;
        tsdPtr->boxesPalette = (DWORD*) (((LPSTR) tsdPtr->boxesPtr) 
                + tsdPtr->boxesPtr->biSize);
        tsdPtr->boxesBits = ((LPSTR) tsdPtr->boxesPalette)
            + ((1 << tsdPtr->boxesPtr->biBitCount) * sizeof(RGBQUAD));
    } else {
        tsdPtr->boxesPtr = NULL;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpButtonSetDefaults --
 *
 *      This procedure is invoked before option tables are created for
 *      buttons.  It modifies some of the default values to match the
 *      current values defined for this platform.
 *
 * Results:
 *      Some of the default values in *specPtr are modified.
 *
 * Side effects:
 *      Updates some of.
 *
 *----------------------------------------------------------------------
 */

void
TkpButtonSetDefaults(specPtr)
    Tk_OptionSpec *specPtr;     /* Points to an array of option specs,
                                 * terminated by one with type
                                 * TK_OPTION_END. */
{
    int width;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (tsdPtr->defWidth[0] == 0) {
        width = GetSystemMetrics(SM_CXEDGE);
        if (width == 0) {
            width = 1;
        }
        sprintf(tsdPtr->defWidth, "%d", width);
    }
    for ( ; specPtr->type != TK_OPTION_END; specPtr++) {
        if (specPtr->internalOffset == Tk_Offset(TkButton, borderWidth)) {
            specPtr->defValue = tsdPtr->defWidth;
        }
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpCreateButton --
 *
 *      Allocate a new TkButton structure.
 *
 * Results:
 *      Returns a newly allocated TkButton structure.
 *
 * Side effects:
 *      Registers an event handler for the widget.
 *
 *----------------------------------------------------------------------
 */

TkButton *
TkpCreateButton(tkwin)
    Tk_Window tkwin;
{
    WinButton *butPtr;

    butPtr = (WinButton *)ckalloc(sizeof(WinButton));
    butPtr->hwnd = NULL;
    return (TkButton *) butPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * CreateProc --
 *
 *      This function creates a new Button control, subclasses
 *      the instance, and generates a new Window object.
 *
 * Results:
 *      Returns the newly allocated Window object, or None on failure.
 *
 * Side effects:
 *      Causes a new Button control to come into existence.
 *
 *----------------------------------------------------------------------
 */

static Window
CreateProc(tkwin, parentWin, instanceData)
    Tk_Window tkwin;            /* Token for window. */
    Window parentWin;           /* Parent of new window. */
    ClientData instanceData;    /* Button instance data. */
{
    Window window;
    HWND parent;
    char *class;
    WinButton *butPtr = (WinButton *)instanceData;

    parent = Tk_GetHWND(parentWin);
    if (butPtr->info.type == TYPE_LABEL) {
        class = "STATIC";
        butPtr->style = SS_OWNERDRAW | WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS;
    } else {
        class = "BUTTON";
        butPtr->style = BS_OWNERDRAW | WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS;
    }
    butPtr->hwnd = CreateWindow(class, NULL, butPtr->style,
            Tk_X(tkwin), Tk_Y(tkwin), Tk_Width(tkwin), Tk_Height(tkwin),
            parent, NULL, Tk_GetHINSTANCE(), NULL);
    SetWindowPos(butPtr->hwnd, HWND_TOP, 0, 0, 0, 0,
                    SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);
    butPtr->oldProc = (WNDPROC)SetWindowLong(butPtr->hwnd, GWL_WNDPROC,
            (DWORD) ButtonProc);

    window = Tk_AttachHWND(tkwin, butPtr->hwnd);
    return window;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpDestroyButton --
 *
 *      Free data structures associated with the button control.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Restores the default control state.
 *
 *----------------------------------------------------------------------
 */

void
TkpDestroyButton(butPtr)
    TkButton *butPtr;
{
    WinButton *winButPtr = (WinButton *)butPtr;
    HWND hwnd = winButPtr->hwnd;
    if (hwnd) {
        SetWindowLong(hwnd, GWL_WNDPROC, (DWORD) winButPtr->oldProc);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpDisplayButton --
 *
 *      This procedure is invoked to display a button widget.  It is
 *      normally invoked as an idle handler.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      Information appears on the screen.  The REDRAW_PENDING flag
 *      is cleared.
 *
 *----------------------------------------------------------------------
 */

void
TkpDisplayButton(clientData)
    ClientData clientData;      /* Information about widget. */
{
    TkWinDCState state;
    HDC dc;
    register TkButton *butPtr = (TkButton *) clientData;
    GC gc;
    Tk_3DBorder border;
    Pixmap pixmap;
    int x = 0;                  /* Initialization only needed to stop
                                 * compiler warning. */
    int y, relief;
    register Tk_Window tkwin = butPtr->tkwin;
    int width, height;
    int defaultWidth;           /* Width of default ring. */
    int offset;                 /* 0 means this is a label widget.  1 means
                                 * it is a flavor of button, so we offset
                                 * the text to make the button appear to
                                 * move up and down as the relief changes. */
    DWORD *boxesPalette;

    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    boxesPalette= tsdPtr->boxesPalette;
    butPtr->flags &= ~REDRAW_PENDING;
    if ((butPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
        return;
    }

    border = butPtr->normalBorder;
    if ((butPtr->state == STATE_DISABLED) && (butPtr->disabledFg != NULL)) {
        gc = butPtr->disabledGC;
    } else if ((butPtr->state == STATE_ACTIVE)
            && !Tk_StrictMotif(butPtr->tkwin)) {
        gc = butPtr->activeTextGC;
        border = butPtr->activeBorder;
    } else {
        gc = butPtr->normalTextGC;
    }
    if ((butPtr->flags & SELECTED) && (butPtr->state != STATE_ACTIVE)
            && (butPtr->selectBorder != NULL) && !butPtr->indicatorOn) {
        border = butPtr->selectBorder;
    }

    /*
     * Override the relief specified for the button if this is a
     * checkbutton or radiobutton and there's no indicator.
     */

    relief = butPtr->relief;
    if ((butPtr->type >= TYPE_CHECK_BUTTON) && !butPtr->indicatorOn) {
        relief = (butPtr->flags & SELECTED) ? TK_RELIEF_SUNKEN
                : TK_RELIEF_RAISED;
    }

    /*
     * Compute width of default ring and offset for pushed buttons.
     */

    if (butPtr->type == TYPE_BUTTON) {
        defaultWidth = ((butPtr->defaultState == DEFAULT_ACTIVE)
                ? butPtr->highlightWidth : 0);
        offset = 1;
    } else {
        defaultWidth = 0;
        if ((butPtr->type >= TYPE_CHECK_BUTTON) && !butPtr->indicatorOn) {
            offset = 1;
        } else {
            offset = 0;
        }
    }

    /*
     * In order to avoid screen flashes, this procedure redraws
     * the button in a pixmap, then copies the pixmap to the
     * screen in a single operation.  This means that there's no
     * point in time where the on-sreen image has been cleared.
     */

    pixmap = Tk_GetPixmap(butPtr->display, Tk_WindowId(tkwin),
            Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin));
    Tk_Fill3DRectangle(tkwin, pixmap, border, 0, 0, Tk_Width(tkwin),
            Tk_Height(tkwin), 0, TK_RELIEF_FLAT);

    /*
     * Display image or bitmap or text for button.
     */

    if (butPtr->image != None) {
        Tk_SizeOfImage(butPtr->image, &width, &height);

        imageOrBitmap:
        TkComputeAnchor(butPtr->anchor, tkwin, 0, 0,
                butPtr->indicatorSpace + width, height, &x, &y);
        x += butPtr->indicatorSpace;

        if (relief == TK_RELIEF_SUNKEN) {
            x += offset;
            y += offset;
        }
        if (butPtr->image != NULL) {
            if ((butPtr->selectImage != NULL) && (butPtr->flags & SELECTED)) {
                Tk_RedrawImage(butPtr->selectImage, 0, 0, width, height,
                        pixmap, x, y);
            } else {
                Tk_RedrawImage(butPtr->image, 0, 0, width, height, pixmap,
                        x, y);
            }
        } else {
            XSetClipOrigin(butPtr->display, gc, x, y);
            XCopyPlane(butPtr->display, butPtr->bitmap, pixmap, gc, 0, 0,
                    (unsigned int) width, (unsigned int) height, x, y, 1);
            XSetClipOrigin(butPtr->display, gc, 0, 0);
        }
        y += height/2;
    } else if (butPtr->bitmap != None) {
        Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
        goto imageOrBitmap;
    } else {
        RECT rect;
        TkComputeAnchor(butPtr->anchor, tkwin, butPtr->padX, butPtr->padY,
                butPtr->indicatorSpace + butPtr->textWidth, butPtr->textHeight,
                &x, &y);

        x += butPtr->indicatorSpace;

        if (relief == TK_RELIEF_SUNKEN) {
            x += offset;
            y += offset;
        }
        Tk_DrawTextLayout(butPtr->display, pixmap, gc, butPtr->textLayout,
                x, y, 0, -1);
        Tk_UnderlineTextLayout(butPtr->display, pixmap, gc,
                butPtr->textLayout, x, y, butPtr->underline);

        /*
         * Draw the focus ring.  If this is a push button then we need to put
         * it around the inner edge of the border, otherwise we put it around
         * the text.
         */

        if (butPtr->flags & GOT_FOCUS && butPtr->type != TYPE_LABEL) {
            dc = TkWinGetDrawableDC(butPtr->display, pixmap, &state);
            if (butPtr->type == TYPE_BUTTON || !butPtr->indicatorOn) {
                rect.top = butPtr->borderWidth + 1 + defaultWidth;
                rect.left = rect.top;
                rect.right = Tk_Width(tkwin) - rect.left;
                rect.bottom = Tk_Height(tkwin) - rect.top;
            } else {
                rect.top = y-2;
                rect.left = x-2;
                rect.right = x+butPtr->textWidth + 1;
                rect.bottom = y+butPtr->textHeight + 1;
            }
            SetTextColor(dc, gc->foreground);
            SetBkColor(dc, gc->background);
            DrawFocusRect(dc, &rect);
            TkWinReleaseDrawableDC(pixmap, dc, &state);
        }
        y += butPtr->textHeight/2;
    }

    /*
     * Draw the indicator for check buttons and radio buttons.  At this
     * point x and y refer to the top-left corner of the text or image
     * or bitmap.
     */

    if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn
            && tsdPtr->boxesPtr) {
        int xSrc, ySrc;

        x -= butPtr->indicatorSpace;
        y -= butPtr->indicatorDiameter / 2;

        xSrc = (butPtr->flags & SELECTED) ? tsdPtr->boxWidth : 0;
        if (butPtr->state == STATE_ACTIVE) {
            xSrc += tsdPtr->boxWidth*2;
        }
        ySrc = (butPtr->type == TYPE_RADIO_BUTTON) ? 0 : tsdPtr->boxHeight;
                
        /*
         * Update the palette in the boxes bitmap to reflect the current
         * button colors.  Note that this code relies on the layout of the
         * bitmap's palette.  Also, all of the colors used to draw the
         * bitmap must be in the palette that is selected into the DC of
         * the offscreen pixmap.  This requires that the static colors
         * be placed into the palette.
         */

        boxesPalette[PAL_CHECK] = FlipColor(gc->foreground);
        boxesPalette[PAL_TOP_OUTER] = FlipColor(TkWinGetBorderPixels(tkwin,
                border, TK_3D_DARK_GC));
        boxesPalette[PAL_TOP_INNER] = FlipColor(TkWinGetBorderPixels(tkwin,
                border, TK_3D_DARK2));
        boxesPalette[PAL_BOTTOM_INNER] = FlipColor(TkWinGetBorderPixels(tkwin,
                border, TK_3D_LIGHT2));
        boxesPalette[PAL_BOTTOM_OUTER] = FlipColor(TkWinGetBorderPixels(tkwin,
                border, TK_3D_LIGHT_GC));
        if (butPtr->state == STATE_DISABLED) {
            boxesPalette[PAL_INTERIOR] = FlipColor(TkWinGetBorderPixels(tkwin,
                border, TK_3D_LIGHT2));
        } else if (butPtr->selectBorder != NULL) {
            boxesPalette[PAL_INTERIOR] = FlipColor(TkWinGetBorderPixels(tkwin,
                    butPtr->selectBorder, TK_3D_FLAT_GC));
        } else {
            boxesPalette[PAL_INTERIOR] = FlipColor(GetSysColor(COLOR_WINDOW));
        }
        boxesPalette[PAL_BACKGROUND] = FlipColor(TkWinGetBorderPixels(tkwin,
                border, TK_3D_FLAT_GC));

        dc = TkWinGetDrawableDC(butPtr->display, pixmap, &state);
        StretchDIBits(dc, x, y, tsdPtr->boxWidth, tsdPtr->boxHeight, 
                xSrc, ySrc, tsdPtr->boxWidth, tsdPtr->boxHeight, 
                tsdPtr->boxesBits, (LPBITMAPINFO) tsdPtr->boxesPtr, 
                DIB_RGB_COLORS, SRCCOPY);
        TkWinReleaseDrawableDC(pixmap, dc, &state);
    }

    /*
     * If the button is disabled with a stipple rather than a special
     * foreground color, generate the stippled effect.  If the widget
     * is selected and we use a different background color when selected,
     * must temporarily modify the GC.
     */

    if ((butPtr->state == STATE_DISABLED)
            && ((butPtr->disabledFg == NULL) || (butPtr->image != NULL))) {
        if ((butPtr->flags & SELECTED) && !butPtr->indicatorOn
                && (butPtr->selectBorder != NULL)) {
            XSetForeground(butPtr->display, butPtr->disabledGC,
                    Tk_3DBorderColor(butPtr->selectBorder)->pixel);
        }
        XFillRectangle(butPtr->display, pixmap, butPtr->disabledGC,
                butPtr->inset, butPtr->inset,
                (unsigned) (Tk_Width(tkwin) - 2*butPtr->inset),
                (unsigned) (Tk_Height(tkwin) - 2*butPtr->inset));
        if ((butPtr->flags & SELECTED) && !butPtr->indicatorOn
                && (butPtr->selectBorder != NULL)) {
            XSetForeground(butPtr->display, butPtr->disabledGC,
                    Tk_3DBorderColor(butPtr->normalBorder)->pixel);
        }
    }

    /*
     * Draw the border and traversal highlight last.  This way, if the
     * button's contents overflow they'll be covered up by the border.
     */

    if (relief != TK_RELIEF_FLAT) {
        Tk_Draw3DRectangle(tkwin, pixmap, border,
                defaultWidth, defaultWidth,
                Tk_Width(tkwin) - 2*defaultWidth,
                Tk_Height(tkwin) - 2*defaultWidth,
                butPtr->borderWidth, relief);
    }
    if (defaultWidth != 0) {
        dc = TkWinGetDrawableDC(butPtr->display, pixmap, &state);
        TkWinFillRect(dc, 0, 0, Tk_Width(tkwin), defaultWidth,
                butPtr->highlightColorPtr->pixel);
        TkWinFillRect(dc, 0, 0, defaultWidth, Tk_Height(tkwin),
                butPtr->highlightColorPtr->pixel);
        TkWinFillRect(dc, 0, Tk_Height(tkwin) - defaultWidth,
                Tk_Width(tkwin), defaultWidth,
                butPtr->highlightColorPtr->pixel);
        TkWinFillRect(dc, Tk_Width(tkwin) - defaultWidth, 0,
                defaultWidth, Tk_Height(tkwin),
                butPtr->highlightColorPtr->pixel);
        TkWinReleaseDrawableDC(pixmap, dc, &state);
    }

    /*
     * Copy the information from the off-screen pixmap onto the screen,
     * then delete the pixmap.
     */

    XCopyArea(butPtr->display, pixmap, Tk_WindowId(tkwin),
            butPtr->copyGC, 0, 0, (unsigned) Tk_Width(tkwin),
            (unsigned) Tk_Height(tkwin), 0, 0);
    Tk_FreePixmap(butPtr->display, pixmap);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpComputeButtonGeometry --
 *
 *      After changes in a button's text or bitmap, this procedure
 *      recomputes the button's geometry and passes this information
 *      along to the geometry manager for the window.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The button's window may change size.
 *
 *----------------------------------------------------------------------
 */

void
TkpComputeButtonGeometry(butPtr)
    register TkButton *butPtr;  /* Button whose geometry may have changed. */
{
    int width, height, avgWidth;
    Tk_FontMetrics fm;
    ThreadSpecificData *tsdPtr = (ThreadSpecificData *) 
            Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));

    if (butPtr->highlightWidth < 0) {
        butPtr->highlightWidth = 0;
    }
    butPtr->inset = butPtr->highlightWidth + butPtr->borderWidth;
    butPtr->indicatorSpace = 0;

    if (!tsdPtr->boxesPtr) {
        InitBoxes();
    }

    if (butPtr->image != NULL) {
        Tk_SizeOfImage(butPtr->image, &width, &height);
        imageOrBitmap:
        if (butPtr->width > 0) {
            width = butPtr->width;
        }
        if (butPtr->height > 0) {
            height = butPtr->height;
        }
        if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn) {
            butPtr->indicatorSpace = tsdPtr->boxWidth * 2;
            butPtr->indicatorDiameter = tsdPtr->boxHeight;
        }
    } else if (butPtr->bitmap != None) {
        Tk_SizeOfBitmap(butPtr->display, butPtr->bitmap, &width, &height);
        goto imageOrBitmap;
    } else {
        Tk_FreeTextLayout(butPtr->textLayout);
        butPtr->textLayout = Tk_ComputeTextLayout(butPtr->tkfont,
                Tcl_GetString(butPtr->textPtr), -1, butPtr->wrapLength,
                butPtr->justify, 0, &butPtr->textWidth, &butPtr->textHeight);

        width = butPtr->textWidth;
        height = butPtr->textHeight;
        avgWidth = Tk_TextWidth(butPtr->tkfont, "0", 1);
        Tk_GetFontMetrics(butPtr->tkfont, &fm);

        if (butPtr->width > 0) {
            width = butPtr->width * avgWidth;
        }
        if (butPtr->height > 0) {
            height = butPtr->height * fm.linespace;
        }

        if ((butPtr->type >= TYPE_CHECK_BUTTON) && butPtr->indicatorOn) {
            butPtr->indicatorDiameter = tsdPtr->boxHeight;
            butPtr->indicatorSpace = butPtr->indicatorDiameter + avgWidth;
        }

        /*
         * Increase the inset to allow for the focus ring.
         */

        if (butPtr->type != TYPE_LABEL) {
            butPtr->inset += 3;
        }
    }

    /*
     * When issuing the geometry request, add extra space for the indicator,
     * if any, and for the border and padding, plus an extra pixel so the
     * display can be offset by 1 pixel in either direction for the raised
     * or lowered effect.
     */

    if ((butPtr->image == NULL) && (butPtr->bitmap == None)) {
        width += 2*butPtr->padX;
        height += 2*butPtr->padY;
    }
    if ((butPtr->type == TYPE_BUTTON)
            || ((butPtr->type >= TYPE_CHECK_BUTTON) && !butPtr->indicatorOn)) {
        width += 1;
        height += 1;
    }
    Tk_GeometryRequest(butPtr->tkwin, (int) (width + butPtr->indicatorSpace
            + 2*butPtr->inset), (int) (height + 2*butPtr->inset));
    Tk_SetInternalBorder(butPtr->tkwin, butPtr->inset);
}

/*
 *----------------------------------------------------------------------
 *
 * ButtonProc --
 *
 *      This function is call by Windows whenever an event occurs on
 *      a button control created by Tk.
 *
 * Results:
 *      Standard Windows return value.
 *
 * Side effects:
 *      May generate events.
 *
 *----------------------------------------------------------------------
 */

static LRESULT CALLBACK
ButtonProc(hwnd, message, wParam, lParam)
    HWND hwnd;
    UINT message;
    WPARAM wParam;
    LPARAM lParam;
{
    LRESULT result;
    WinButton *butPtr;
    Tk_Window tkwin = Tk_HWNDToWindow(hwnd);

    if (tkwin == NULL) {
        panic("ButtonProc called on an invalid HWND");
    }
    butPtr = (WinButton *)((TkWindow*)tkwin)->instanceData;

    switch(message) {
        case WM_ERASEBKGND:
            return 0;

        case BM_GETCHECK:
            if (((butPtr->info.type == TYPE_CHECK_BUTTON)
                    || (butPtr->info.type == TYPE_RADIO_BUTTON))
                    && butPtr->info.indicatorOn) {
                return (butPtr->info.flags & SELECTED)
                    ? BST_CHECKED : BST_UNCHECKED;
            }
            return 0;

        case BM_GETSTATE: {
            DWORD state = 0;
            if (((butPtr->info.type == TYPE_CHECK_BUTTON)
                    || (butPtr->info.type == TYPE_RADIO_BUTTON))
                    && butPtr->info.indicatorOn) {
                state = (butPtr->info.flags & SELECTED)
                    ? BST_CHECKED : BST_UNCHECKED;
            }
            if (butPtr->info.flags & GOT_FOCUS) {
                state |= BST_FOCUS;
            }
            return state;
        }
        case WM_ENABLE:
            break;

        case WM_PAINT: {
            PAINTSTRUCT ps;
            BeginPaint(hwnd, &ps);
            EndPaint(hwnd, &ps);
            TkpDisplayButton((ClientData)butPtr);

            /*
             * Special note: must cancel any existing idle handler
             * for TkpDisplayButton;  it's no longer needed, and
             * TkpDisplayButton cleared the REDRAW_PENDING flag.
             */
           
            Tcl_CancelIdleCall(TkpDisplayButton, (ClientData)butPtr);
            return 0;
        }
        case BN_CLICKED: {
            int code;
            Tcl_Interp *interp = butPtr->info.interp;
            if (butPtr->info.state != STATE_DISABLED) {
                Tcl_Preserve((ClientData)interp);
                code = TkInvokeButton((TkButton*)butPtr);
                if (code != TCL_OK && code != TCL_CONTINUE
                        && code != TCL_BREAK) {
                    Tcl_AddErrorInfo(interp, "\n    (button invoke)");
                    Tcl_BackgroundError(interp);
                }
                Tcl_Release((ClientData)interp);
            }
            Tcl_ServiceAll();
            return 0;
        }

        default:
            if (Tk_TranslateWinEvent(hwnd, message, wParam, lParam, &result)) {
                return result;
            }
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

/* End of tkwinbutton.c */