Celestin Apprentice 7/Apprentice-Release7.iso/Source Code/C/Applications/Tcl-Tk 8.0/Pre-installed version/tk8.0/win/tkWinCursor.c

C/C++ Source or Header | 1997-08-15 | 5.0 KB | 211 lines | [TEXT/CWIE]

/*
 * tkWinCursor.c --
 *
 *    This file contains Win32 specific cursor related routines.
 *
 * Copyright (c) 1995 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) tkWinCursor.c 1.9 96/10/31 10:41:10
 */

#include "tkWinInt.h"

/*
 * The following data structure contains the system specific data
 * necessary to control Windows cursors.
 */

typedef struct {
    TkCursor info;        /* Generic cursor info used by tkCursor.c */
    HCURSOR winCursor;        /* Win32 cursor handle. */
    int system;            /* 1 if cursor is a system cursor, else 0. */
} TkWinCursor;

/*
 * The table below is used to map from the name of a predefined cursor
 * to its resource identifier.
 */

static struct CursorName {
    char *name;
    LPCTSTR id;
} cursorNames[] = {
    {"starting",        IDC_APPSTARTING},
    {"arrow",            IDC_ARROW},
    {"ibeam",            IDC_IBEAM},
    {"icon",            IDC_ICON},
    {"no",            IDC_NO},
    {"size",            IDC_SIZE},
    {"size_ne_sw",        IDC_SIZENESW},
    {"size_ns",            IDC_SIZENS},
    {"size_nw_se",        IDC_SIZENWSE},
    {"size_we",            IDC_SIZEWE},
    {"uparrow",            IDC_UPARROW},
    {"wait",            IDC_WAIT},
    {"crosshair",        IDC_CROSS},
    {"fleur",            IDC_SIZE},
    {"sb_v_double_arrow",    IDC_SIZENS},
    {"sb_h_double_arrow",    IDC_SIZEWE},
    {"center_ptr",        IDC_UPARROW},
    {"watch",            IDC_WAIT},
    {"xterm",            IDC_IBEAM},
    {NULL,            0}
};

/*
 * The default cursor is used whenever no other cursor has been specified.
 */

#define TK_DEFAULT_CURSOR    IDC_ARROW


/*
 *----------------------------------------------------------------------
 *
 * TkGetCursorByName --
 *
 *    Retrieve a system cursor by name.
 *
 * Results:
 *    Returns a new cursor, or NULL on errors.
 *
 * Side effects:
 *    Allocates a new cursor.
 *
 *----------------------------------------------------------------------
 */

TkCursor *
TkGetCursorByName(interp, tkwin, string)
    Tcl_Interp *interp;        /* Interpreter to use for error reporting. */
    Tk_Window tkwin;        /* Window in which cursor will be used. */
    Tk_Uid string;        /* Description of cursor.  See manual entry
                 * for details on legal syntax. */
{
    struct CursorName *namePtr;
    TkWinCursor *cursorPtr;

    /*
     * Check for the cursor in the system cursor set.
     */

    for (namePtr = cursorNames; namePtr->name != NULL; namePtr++) {
    if (strcmp(namePtr->name, string) == 0) {
        break;
    }
    }

    cursorPtr = (TkWinCursor *) ckalloc(sizeof(TkWinCursor));
    cursorPtr->info.cursor = (Tk_Cursor) cursorPtr;
    cursorPtr->winCursor = NULL;
    if (namePtr->name != NULL) {
    cursorPtr->winCursor = LoadCursor(NULL, namePtr->id);
    cursorPtr->system = 1;
    }
    if (cursorPtr->winCursor == NULL) {
    cursorPtr->winCursor = LoadCursor(TkWinGetTkModule(), string);
    cursorPtr->system = 0;
    }
    if (cursorPtr->winCursor == NULL) {
    ckfree((char *)cursorPtr);
    Tcl_AppendResult(interp, "bad cursor spec \"", string, "\"",
        (char *) NULL);
    return NULL;
    } else {
    return (TkCursor *) cursorPtr;
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkCreateCursorFromData --
 *
 *    Creates a cursor from the source and mask bits.
 *
 * Results:
 *    Returns a new cursor, or NULL on errors.
 *
 * Side effects:
 *    Allocates a new cursor.
 *
 *----------------------------------------------------------------------
 */

TkCursor *
TkCreateCursorFromData(tkwin, source, mask, width, height, xHot, yHot,
    fgColor, bgColor)
    Tk_Window tkwin;        /* Window in which cursor will be used. */
    char *source;        /* Bitmap data for cursor shape. */
    char *mask;            /* Bitmap data for cursor mask. */
    int width, height;        /* Dimensions of cursor. */
    int xHot, yHot;        /* Location of hot-spot in cursor. */
    XColor fgColor;        /* Foreground color for cursor. */
    XColor bgColor;        /* Background color for cursor. */
{
    return NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * TkFreeCursor --
 *
 *    This procedure is called to release a cursor allocated by
 *    TkGetCursorByName.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    The cursor data structure is deallocated.
 *
 *----------------------------------------------------------------------
 */

void
TkFreeCursor(cursorPtr)
    TkCursor *cursorPtr;
{
    TkWinCursor *winCursorPtr = (TkWinCursor *) cursorPtr;
    ckfree((char *) winCursorPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * TkpSetCursor --
 *
 *    Set the global cursor.  If the cursor is None, then use the
 *    default Tk cursor.
 *
 * Results:
 *    None.
 *
 * Side effects:
 *    Changes the mouse cursor.
 *
 *----------------------------------------------------------------------
 */

void
TkpSetCursor(cursor)
    TkpCursor cursor;
{
    HCURSOR hcursor;
    TkWinCursor *winCursor = (TkWinCursor *) cursor;

    if (winCursor == NULL || winCursor->winCursor == NULL) {
    hcursor = LoadCursor(NULL, TK_DEFAULT_CURSOR);
    } else {
    hcursor = winCursor->winCursor;
    }

    if (hcursor != NULL) {
    SetCursor(hcursor);
    }
}