tkwinbutton.c

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/* 
 * 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 1.20.2.3 2003/10/10 00:03:57 hobbs Exp $
 */

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

/*
 * 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)

/*
 * 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 LRESULT CALLBACK	ButtonProc _ANSI_ARGS_((HWND hwnd, UINT message,
			    WPARAM wParam, LPARAM lParam));
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.
 */

Tk_ClassProcs tkpButtonProcs = { 
    sizeof(Tk_ClassProcs),	/* size */
    TkButtonWorldChanged,	/* worldChangedProc */
    CreateProc,			/* createProc */
};


/*
 *----------------------------------------------------------------------
 *
 * 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, "buttons", RT_BITMAP);
    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);
#ifdef _WIN64
    butPtr->oldProc = (WNDPROC)SetWindowLongPtr(butPtr->hwnd, GWLP_WNDPROC,
	    (LONG_PTR) ButtonProc);
#else
    butPtr->oldProc = (WNDPROC)SetWindowLong(butPtr->hwnd, GWL_WNDPROC,
	    (DWORD) ButtonProc);
#endif

    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) {
#ifdef _WIN64
	SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR) winButPtr->oldProc);
#else
	SetWindowLong(hwnd, GWL_WNDPROC, (DWORD) winButPtr->oldProc);
#endif
    }
}

/*
 *----------------------------------------------------------------------
 *
 * 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=0, height=0, haveImage = 0, haveText = 0, drawRing = 0;
    RECT rect;
    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. */
    int textXOffset = 0, textYOffset = 0; /* text offsets for use with
					   * compound buttons and focus ring */
    int imageWidth=0, imageHeight=0;
    int imageXOffset = 0, imageYOffset = 0; /* image information that will
					     * be used to restrict disabled
					     * pixmap as well */
    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.  The new
     * relief is as follows:
     *      If the button is select  --> "sunken"
     *      If relief==overrelief    --> relief
     *      Otherwise                --> overrelief
     *
     * The effect we are trying to achieve is as follows:
     *
     *      value    mouse-over?   -->   relief
     *     -------  ------------        --------
     *       off        no               flat
     *       off        yes              raised
     *       on         no               sunken
     *       on         yes              sunken
     *
     * This is accomplished by configuring the checkbutton or radiobutton
     * like this:
     *
     *     -indicatoron 0 -overrelief raised -offrelief flat
     *
     * Bindings (see library/button.tcl) will copy the -overrelief into