/* * tkEntry.c -- * * This module implements entry widgets for the Tk * toolkit. An entry displays a string and allows * the string to be edited. * * 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: tkEntry.c,v 1.5.4.1 1999/11/19 23:35:44 hobbs Exp $ */ #include "tkInt.h" #include "default.h" /* * A data structure of the following type is kept for each entry * widget managed by this file: */ typedef struct { Tk_Window tkwin; /* Window that embodies the entry. NULL * means that the window has been destroyed * but the data structures haven't yet been * cleaned up.*/ Display *display; /* Display containing widget. Used, among * other things, so that resources can be * freed even after tkwin has gone away. */ Tcl_Interp *interp; /* Interpreter associated with entry. */ Tcl_Command widgetCmd; /* Token for entry's widget command. */ Tk_OptionTable optionTable; /* Table that defines configuration options * available for this widget. */ /* * Fields that are set by widget commands other than "configure". */ char *string; /* Pointer to storage for string; * NULL-terminated; malloc-ed. */ int insertPos; /* Character index before which next typed * character will be inserted. */ /* * Information about what's selected, if any. */ int selectFirst; /* Character index of first selected * character (-1 means nothing selected. */ int selectLast; /* Character index just after last selected * character (-1 means nothing selected. */ int selectAnchor; /* Fixed end of selection (i.e. "select to" * operation will use this as one end of the * selection). */ /* * Information for scanning: */ int scanMarkX; /* X-position at which scan started (e.g. * button was pressed here). */ int scanMarkIndex; /* Character index of character that was at * left of window when scan started. */ /* * Configuration settings that are updated by Tk_ConfigureWidget. */ Tk_3DBorder normalBorder; /* Used for drawing border around whole * window, plus used for background. */ int borderWidth; /* Width of 3-D border around window. */ Tk_Cursor cursor; /* Current cursor for window, or None. */ int exportSelection; /* Non-zero means tie internal entry selection * to X selection. */ Tk_Font tkfont; /* Information about text font, or NULL. */ XColor *fgColorPtr; /* Text color in normal mode. */ XColor *highlightBgColorPtr;/* Color for drawing traversal highlight * area when highlight is off. */ XColor *highlightColorPtr; /* Color for drawing traversal highlight. */ int highlightWidth; /* Width in pixels of highlight to draw * around widget when it has the focus. * <= 0 means don't draw a highlight. */ Tk_3DBorder insertBorder; /* Used to draw vertical bar for insertion * cursor. */ int insertBorderWidth; /* Width of 3-D border around insert cursor. */ int insertOffTime; /* Number of milliseconds cursor should spend * in "off" state for each blink. */ int insertOnTime; /* Number of milliseconds cursor should spend * in "on" state for each blink. */ int insertWidth; /* Total width of insert cursor. */ Tk_Justify justify; /* Justification to use for text within * window. */ int relief; /* 3-D effect: TK_RELIEF_RAISED, etc. */ Tk_3DBorder selBorder; /* Border and background for selected * characters. */ int selBorderWidth; /* Width of border around selection. */ XColor *selFgColorPtr; /* Foreground color for selected text. */ char *showChar; /* Value of -show option. If non-NULL, first * character is used for displaying all * characters in entry. Malloc'ed. */ int state; /* Normal or disabled. Entry is read-only * when disabled. */ char *textVarName; /* Name of variable (malloc'ed) or NULL. * If non-NULL, entry's string tracks the * contents of this variable and vice versa. */ char *takeFocus; /* Value of -takefocus option; not used in * the C code, but used by keyboard traversal * scripts. Malloc'ed, but may be NULL. */ int prefWidth; /* Desired width of window, measured in * average characters. */ char *scrollCmd; /* Command prefix for communicating with * scrollbar(s). Malloc'ed. NULL means * no command to issue. */ /* * Fields whose values are derived from the current values of the * configuration settings above. */ int numBytes; /* Length of string in bytes. */ int numChars; /* Length of string in characters. Both * string and displayString have the same * character length, but may have different * byte lengths due to being made from * different UTF-8 characters. */ char *displayString; /* String to use when displaying. This may * be a pointer to string, or a pointer to * malloced memory with the same character * length as string but whose characters * are all equal to showChar. */ int numDisplayBytes; /* Length of displayString in bytes. */ int inset; /* Number of pixels on the left and right * sides that are taken up by XPAD, borderWidth * (if any), and highlightWidth (if any). */ Tk_TextLayout textLayout; /* Cached text layout information. */ int layoutX, layoutY; /* Origin for layout. */ int leftX; /* X position at which character at leftIndex * is drawn (varies depending on justify). */ int leftIndex; /* Character index of left-most character * visible in window. */ Tcl_TimerToken insertBlinkHandler; /* Timer handler used to blink cursor on and * off. */ GC textGC; /* For drawing normal text. */ GC selTextGC; /* For drawing selected text. */ GC highlightGC; /* For drawing traversal highlight. */ int avgWidth; /* Width of average character. */ int flags; /* Miscellaneous flags; see below for * definitions. */ } Entry; /* * Assigned bits of "flags" fields of Entry structures, and what those * bits mean: * * REDRAW_PENDING: Non-zero means a DoWhenIdle handler has * already been queued to redisplay the entry. * BORDER_NEEDED: Non-zero means 3-D border must be redrawn * around window during redisplay. Normally * only text portion needs to be redrawn. * CURSOR_ON: Non-zero means insert cursor is displayed at * present. 0 means it isn't displayed. * GOT_FOCUS: Non-zero means this window has the input * focus. * UPDATE_SCROLLBAR: Non-zero means scrollbar should be updated * during next redisplay operation. * GOT_SELECTION: Non-zero means we've claimed the selection. */ #define REDRAW_PENDING 1 #define BORDER_NEEDED 2 #define CURSOR_ON 4 #define GOT_FOCUS 8 #define UPDATE_SCROLLBAR 0x10 #define GOT_SELECTION 0x20 #define ENTRY_DELETED 0x40 /* * The following macro defines how many extra pixels to leave on each * side of the text in the entry. */ #define XPAD 1 #define YPAD 1 /* * The following enum is used to define a type for the -state option * of the Entry widget. These values are used as indices into the * string table below. */ enum state { STATE_DISABLED, STATE_NORMAL }; static char *stateStrings[] = { "disabled", "normal", (char *) NULL }; /* * Information used for argv parsing. */ static Tk_OptionSpec optionSpecs[] = { {TK_OPTION_BORDER, "-background", "background", "Background", DEF_ENTRY_BG_COLOR, -1, Tk_Offset(Entry, normalBorder), 0, (ClientData) DEF_ENTRY_BG_MONO, 0}, {TK_OPTION_SYNONYM, "-bd", (char *) NULL, (char *) NULL, (char *) NULL, 0, -1, 0, (ClientData) "-borderwidth", 0}, {TK_OPTION_SYNONYM, "-bg", (char *) NULL, (char *) NULL, (char *) NULL, 0, -1, 0, (ClientData) "-background", 0}, {TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth", DEF_ENTRY_BORDER_WIDTH, -1, Tk_Offset(Entry, borderWidth), 0, 0, 0}, {TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor", DEF_ENTRY_CURSOR, -1, Tk_Offset(Entry, cursor), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_BOOLEAN, "-exportselection", "exportSelection", "ExportSelection", DEF_ENTRY_EXPORT_SELECTION, -1, Tk_Offset(Entry, exportSelection), 0, 0, 0}, {TK_OPTION_SYNONYM, "-fg", "foreground", (char *) NULL, (char *) NULL, 0, -1, 0, (ClientData) "-foreground", 0}, {TK_OPTION_FONT, "-font", "font", "Font", DEF_ENTRY_FONT, -1, Tk_Offset(Entry, tkfont), 0, 0, 0}, {TK_OPTION_COLOR, "-foreground", "foreground", "Foreground", DEF_ENTRY_FG, -1, Tk_Offset(Entry, fgColorPtr), 0, 0, 0}, {TK_OPTION_COLOR, "-highlightbackground", "highlightBackground", "HighlightBackground", DEF_ENTRY_HIGHLIGHT_BG, -1, Tk_Offset(Entry, highlightBgColorPtr), 0, 0, 0}, {TK_OPTION_COLOR, "-highlightcolor", "highlightColor", "HighlightColor", DEF_ENTRY_HIGHLIGHT, -1, Tk_Offset(Entry, highlightColorPtr), 0, 0, 0}, {TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness", "HighlightThickness", DEF_ENTRY_HIGHLIGHT_WIDTH, -1, Tk_Offset(Entry, highlightWidth), 0, 0, 0}, {TK_OPTION_BORDER, "-insertbackground", "insertBackground", "Foreground", DEF_ENTRY_INSERT_BG, -1, Tk_Offset(Entry, insertBorder), 0, 0, 0}, {TK_OPTION_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth", DEF_ENTRY_INSERT_BD_COLOR, -1, Tk_Offset(Entry, insertBorderWidth), 0, (ClientData) DEF_ENTRY_INSERT_BD_MONO, 0}, {TK_OPTION_INT, "-insertofftime", "insertOffTime", "OffTime", DEF_ENTRY_INSERT_OFF_TIME, -1, Tk_Offset(Entry, insertOffTime), 0, 0, 0}, {TK_OPTION_INT, "-insertontime", "insertOnTime", "OnTime", DEF_ENTRY_INSERT_ON_TIME, -1, Tk_Offset(Entry, insertOnTime), 0, 0, 0}, {TK_OPTION_PIXELS, "-insertwidth", "insertWidth", "InsertWidth", DEF_ENTRY_INSERT_WIDTH, -1, Tk_Offset(Entry, insertWidth), 0, 0, 0}, {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify", DEF_ENTRY_JUSTIFY, -1, Tk_Offset(Entry, justify), 0, 0, 0}, {TK_OPTION_RELIEF, "-relief", "relief", "Relief", DEF_ENTRY_RELIEF, -1, Tk_Offset(Entry, relief), 0, 0, 0}, {TK_OPTION_BORDER, "-selectbackground", "selectBackground", "Foreground", DEF_ENTRY_SELECT_COLOR, -1, Tk_Offset(Entry, selBorder), 0, (ClientData) DEF_ENTRY_SELECT_MONO, 0}, {TK_OPTION_PIXELS, "-selectborderwidth", "selectBorderWidth", "BorderWidth", DEF_ENTRY_SELECT_BD_COLOR, -1, Tk_Offset(Entry, selBorderWidth), 0, (ClientData) DEF_ENTRY_SELECT_BD_MONO, 0}, {TK_OPTION_COLOR, "-selectforeground", "selectForeground", "Background", DEF_ENTRY_SELECT_FG_COLOR, -1, Tk_Offset(Entry, selFgColorPtr), 0, (ClientData) DEF_ENTRY_SELECT_FG_MONO, 0}, {TK_OPTION_STRING, "-show", "show", "Show", DEF_ENTRY_SHOW, -1, Tk_Offset(Entry, showChar), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_STRING_TABLE, "-state", "state", "State", DEF_ENTRY_STATE, -1, Tk_Offset(Entry, state), 0, (ClientData) stateStrings, 0}, {TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus", DEF_ENTRY_TAKE_FOCUS, -1, Tk_Offset(Entry, takeFocus), TK_CONFIG_NULL_OK, 0, 0}, {TK_OPTION_STRING, "-textvariable", "textVariable", "Variable", DEF_ENTRY_TEXT_VARIABLE, -1, Tk_Offset(Entry, textVarName), TK_CONFIG_NULL_OK, 0, 0}, {TK_OPTION_INT, "-width", "width", "Width", DEF_ENTRY_WIDTH, -1, Tk_Offset(Entry, prefWidth), 0, 0, 0}, {TK_OPTION_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand", DEF_ENTRY_SCROLL_COMMAND, -1, Tk_Offset(Entry, scrollCmd), TK_CONFIG_NULL_OK, 0, 0}, {TK_OPTION_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, -1, 0, 0, 0} }; /* * Flags for GetEntryIndex procedure: */ #define ZERO_OK 1 #define LAST_PLUS_ONE_OK 2 /* * The following tables define the entry widget commands (and sub- * commands) and map the indexes into the string tables into * enumerated types used to dispatch the entry widget command. */ static char *commandNames[] = { "bbox", "cget", "configure", "delete", "get", "icursor", "index", "insert", "scan", "selection", "xview", (char *) NULL }; enum command { COMMAND_BBOX, COMMAND_CGET, COMMAND_CONFIGURE, COMMAND_DELETE, COMMAND_GET, COMMAND_ICURSOR, COMMAND_INDEX, COMMAND_INSERT, COMMAND_SCAN, COMMAND_SELECTION, COMMAND_XVIEW }; static char *selCommandNames[] = { "adjust", "clear", "from", "present", "range", "to", (char *) NULL }; enum selcommand { SELECTION_ADJUST, SELECTION_CLEAR, SELECTION_FROM, SELECTION_PRESENT, SELECTION_RANGE, SELECTION_TO }; /* * Forward declarations for procedures defined later in this file: */ static int ConfigureEntry _ANSI_ARGS_((Tcl_Interp *interp, Entry *entryPtr, int objc, Tcl_Obj *CONST objv[], int flags)); static void DeleteChars _ANSI_ARGS_((Entry *entryPtr, int index, int count)); static void DestroyEntry _ANSI_ARGS_((char *memPtr)); static void DisplayEntry _ANSI_ARGS_((ClientData clientData)); static void EntryBlinkProc _ANSI_ARGS_((ClientData clientData)); static void EntryCmdDeletedProc _ANSI_ARGS_(( ClientData clientData)); static void EntryComputeGeometry _ANSI_ARGS_((Entry *entryPtr)); static void EntryEventProc _ANSI_ARGS_((ClientData clientData, XEvent *eventPtr)); static void EntryFocusProc _ANSI_ARGS_ ((Entry *entryPtr, int gotFocus)); static int EntryFetchSelection _ANSI_ARGS_((ClientData clientData, int offset, char *buffer, int maxBytes)); static void EntryLostSelection _ANSI_ARGS_(( ClientData clientData)); static void EventuallyRedraw _ANSI_ARGS_((Entry *entryPtr)); static void EntryScanTo _ANSI_ARGS_((Entry *entryPtr, int y)); static void EntrySetValue _ANSI_ARGS_((Entry *entryPtr, char *value)); static void EntrySelectTo _ANSI_ARGS_(( Entry *entryPtr, int index)); static char * EntryTextVarProc _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, char *name1, char *name2, int flags)); static void EntryUpdateScrollbar _ANSI_ARGS_((Entry *entryPtr)); static void EntryValueChanged _ANSI_ARGS_((Entry *entryPtr)); static void EntryVisibleRange _ANSI_ARGS_((Entry *entryPtr, double *firstPtr, double *lastPtr)); static int EntryWidgetObjCmd _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])); static void EntryWorldChanged _ANSI_ARGS_(( ClientData instanceData)); static int GetEntryIndex _ANSI_ARGS_((Tcl_Interp *interp, Entry *entryPtr, char *string, int *indexPtr)); static void InsertChars _ANSI_ARGS_((Entry *entryPtr, int index, char *string)); /* * The structure below defines entry class behavior by means of procedures * that can be invoked from generic window code. */ static TkClassProcs entryClass = { NULL, /* createProc. */ EntryWorldChanged, /* geometryProc. */ NULL /* modalProc. */ }; /* *-------------------------------------------------------------- * * Tk_EntryObjCmd -- * * This procedure is invoked to process the "entry" 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_EntryObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Either NULL or pointer to option table. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { register Entry *entryPtr; Tk_OptionTable optionTable; Tk_Window tkwin; optionTable = (Tk_OptionTable) clientData; if (optionTable == NULL) { Tcl_CmdInfo info; char *name; /* * We haven't created the option table for this widget class * yet. Do it now and save the table as the clientData for * the command, so we'll have access to it in future * invocations of the command. */ optionTable = Tk_CreateOptionTable(interp, optionSpecs); name = Tcl_GetString(objv[0]); Tcl_GetCommandInfo(interp, name, &info); info.objClientData = (ClientData) optionTable; Tcl_SetCommandInfo(interp, name, &info); } if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?"); return TCL_ERROR; } tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp), Tcl_GetString(objv[1]), (char *) NULL); if (tkwin == NULL) { return TCL_ERROR; } /* * Initialize the fields of the structure that won't be initialized * by ConfigureEntry, or that ConfigureEntry requires to be * initialized already (e.g. resource pointers). */ entryPtr = (Entry *) ckalloc(sizeof(Entry)); entryPtr->tkwin = tkwin; entryPtr->display = Tk_Display(tkwin); entryPtr->interp = interp; entryPtr->widgetCmd = Tcl_CreateObjCommand(interp, Tk_PathName(entryPtr->tkwin), EntryWidgetObjCmd, (ClientData) entryPtr, EntryCmdDeletedProc); entryPtr->optionTable = optionTable; entryPtr->string = (char *) ckalloc(1); entryPtr->string[0] = '\0'; entryPtr->insertPos = 0; entryPtr->selectFirst = -1; entryPtr->selectLast = -1; entryPtr->selectAnchor = 0; entryPtr->scanMarkX = 0; entryPtr->scanMarkIndex = 0; entryPtr->normalBorder = NULL; entryPtr->borderWidth = 0; entryPtr->cursor = None; entryPtr->exportSelection = 1; entryPtr->tkfont = NULL; entryPtr->fgColorPtr = NULL; entryPtr->highlightBgColorPtr = NULL; entryPtr->highlightColorPtr = NULL; entryPtr->highlightWidth = 0; entryPtr->insertBorder = NULL; entryPtr->insertBorderWidth = 0; entryPtr->insertOffTime = 0; entryPtr->insertOnTime = 0; entryPtr->insertWidth = 0; entryPtr->justify = TK_JUSTIFY_LEFT; entryPtr->relief = TK_RELIEF_FLAT; entryPtr->selBorder = NULL; entryPtr->selBorderWidth = 0; entryPtr->selFgColorPtr = NULL; entryPtr->showChar = NULL; entryPtr->state = STATE_NORMAL; entryPtr->textVarName = NULL; entryPtr->takeFocus = NULL; entryPtr->prefWidth = 0; entryPtr->scrollCmd = NULL; entryPtr->numBytes = 0; entryPtr->numChars = 0; entryPtr->displayString = entryPtr->string; entryPtr->numDisplayBytes = 0; entryPtr->inset = XPAD; entryPtr->textLayout = NULL; entryPtr->layoutX = 0; entryPtr->layoutY = 0; entryPtr->leftX = 0; entryPtr->leftIndex = 0; entryPtr->insertBlinkHandler = (Tcl_TimerToken) NULL; entryPtr->textGC = None; entryPtr->selTextGC = None; entryPtr->highlightGC = None; entryPtr->avgWidth = 1; entryPtr->flags = 0; Tk_SetClass(entryPtr->tkwin, "Entry"); TkSetClassProcs(entryPtr->tkwin, &entryClass, (ClientData) entryPtr); Tk_CreateEventHandler(entryPtr->tkwin, ExposureMask|StructureNotifyMask|FocusChangeMask, EntryEventProc, (ClientData) entryPtr); Tk_CreateSelHandler(entryPtr->tkwin, XA_PRIMARY, XA_STRING, EntryFetchSelection, (ClientData) entryPtr, XA_STRING); if (Tk_InitOptions(interp, (char *) entryPtr, optionTable, tkwin) != TCL_OK) { Tk_DestroyWindow(entryPtr->tkwin); return TCL_ERROR; } if (ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0) != TCL_OK) { goto error; } Tcl_SetResult(interp, Tk_PathName(entryPtr->tkwin), TCL_STATIC); return TCL_OK; error: Tk_DestroyWindow(entryPtr->tkwin); return TCL_ERROR; } /* *-------------------------------------------------------------- * * EntryWidgetObjCmd -- * * 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 EntryWidgetObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Information about entry widget. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ { Entry *entryPtr = (Entry *) clientData; int cmdIndex, selIndex, result; Tcl_Obj *objPtr; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?"); return TCL_ERROR; } Tcl_Preserve((ClientData) entryPtr); /* * Parse the widget command by looking up the second token in * the list of valid command names. */ result = Tcl_GetIndexFromObj(interp, objv[1], commandNames, "option", 0, &cmdIndex); if (result != TCL_OK) { return result; } switch (cmdIndex) { case COMMAND_BBOX: { int index, x, y, width, height; char *string; char buf[TCL_INTEGER_SPACE * 4]; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "bbox index"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), &index) != TCL_OK) { goto error; } if ((index == entryPtr->numChars) && (index > 0)) { index--; } string = entryPtr->displayString; Tk_CharBbox(entryPtr->textLayout, index, &x, &y, &width, &height); sprintf(buf, "%d %d %d %d", x + entryPtr->layoutX, y + entryPtr->layoutY, width, height); Tcl_SetResult(interp, buf, TCL_VOLATILE); break; } case COMMAND_CGET: { if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "cget option"); goto error; } objPtr = Tk_GetOptionValue(interp, (char *) entryPtr, entryPtr->optionTable, objv[2], entryPtr->tkwin); if (objPtr == NULL) { goto error; } else { Tcl_SetObjResult(interp, objPtr); } break; } case COMMAND_CONFIGURE: { if (objc <= 3) { objPtr = Tk_GetOptionInfo(interp, (char *) entryPtr, entryPtr->optionTable, (objc == 3) ? objv[2] : (Tcl_Obj *) NULL, entryPtr->tkwin); if (objPtr == NULL) { goto error; } else { Tcl_SetObjResult(interp, objPtr); } } else { result = ConfigureEntry(interp, entryPtr, objc-2, objv+2, 0); } break; } case COMMAND_DELETE: { int first, last; if ((objc < 3) || (objc > 4)) { Tcl_WrongNumArgs(interp, 1, objv, "delete firstIndex ?lastIndex?"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), &first) != TCL_OK) { goto error; } if (objc == 3) { last = first + 1; } else { if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), &last) != TCL_OK) { goto error; } } if ((last >= first) && (entryPtr->state == STATE_NORMAL)) { DeleteChars(entryPtr, first, last - first); } break; } case COMMAND_GET: { if (objc != 2) { Tcl_WrongNumArgs(interp, 1, objv, "get"); goto error; } Tcl_SetResult(interp, entryPtr->string, TCL_STATIC); break; } case COMMAND_ICURSOR: { if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "icursor pos"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), &entryPtr->insertPos) != TCL_OK) { goto error; } EventuallyRedraw(entryPtr); break; } case COMMAND_INDEX: { int index; char buf[TCL_INTEGER_SPACE]; if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "index string"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), &index) != TCL_OK) { goto error; } sprintf(buf, "%d", index); Tcl_SetResult(interp, buf, TCL_VOLATILE); break; } case COMMAND_INSERT: { int index; if (objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "insert index text"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), &index) != TCL_OK) { goto error; } if (entryPtr->state == STATE_NORMAL) { InsertChars(entryPtr, index, Tcl_GetString(objv[3])); } break; } case COMMAND_SCAN: { int x; char *minorCmd; if (objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "scan mark|dragto x"); goto error; } if (Tcl_GetIntFromObj(interp, objv[3], &x) != TCL_OK) { goto error; } minorCmd = Tcl_GetString(objv[2]); if (minorCmd[0] == 'm' && (strncmp(minorCmd, "mark", strlen(minorCmd)) == 0)) { entryPtr->scanMarkX = x; entryPtr->scanMarkIndex = entryPtr->leftIndex; } else if ((minorCmd[0] == 'd') && (strncmp(minorCmd, "dragto", strlen(minorCmd)) == 0)) { EntryScanTo(entryPtr, x); } else { Tcl_AppendResult(interp, "bad scan option \"", Tcl_GetString(objv[2]), "\": must be mark or dragto", (char *) NULL); goto error; } break; } case COMMAND_SELECTION: { int index, index2; if (objc < 3) { Tcl_WrongNumArgs(interp, 1, objv, "select option ?index?"); goto error; } /* * Parse the selection sub-command, using the command * table "selCommandNames" defined above. */ result = Tcl_GetIndexFromObj(interp, objv[2], selCommandNames, "selection option", 0, &selIndex); if (result != TCL_OK) { goto error; } switch(selIndex) { case SELECTION_ADJUST: { if (objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "selection adjust index"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), &index) != TCL_OK) { goto error; } if (entryPtr->selectFirst >= 0) { int half1, half2; half1 = (entryPtr->selectFirst + entryPtr->selectLast)/2; half2 = (entryPtr->selectFirst + entryPtr->selectLast + 1)/2; if (index < half1) { entryPtr->selectAnchor = entryPtr->selectLast; } else if (index > half2) { entryPtr->selectAnchor = entryPtr->selectFirst; } else { /* * We're at about the halfway point in the * selection; just keep the existing anchor. */ } } EntrySelectTo(entryPtr, index); break; } case SELECTION_CLEAR: { if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "selection clear"); goto error; } if (entryPtr->selectFirst >= 0) { entryPtr->selectFirst = -1; entryPtr->selectLast = -1; EventuallyRedraw(entryPtr); } goto done; } case SELECTION_FROM: { if (objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "selection from index"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), &index) != TCL_OK) { goto error; } entryPtr->selectAnchor = index; break; } case SELECTION_PRESENT: { if (objc != 3) { Tcl_WrongNumArgs(interp, 1, objv, "selection present"); goto error; } if (entryPtr->selectFirst < 0) { Tcl_SetResult(interp, "0", TCL_STATIC); } else { Tcl_SetResult(interp, "1", TCL_STATIC); } goto done; } case SELECTION_RANGE: { if (objc != 5) { Tcl_WrongNumArgs(interp, 1, objv, "selection range start end"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), &index) != TCL_OK) { goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[4]),& index2) != TCL_OK) { goto error; } if (index >= index2) { entryPtr->selectFirst = -1; entryPtr->selectLast = -1; } else { entryPtr->selectFirst = index; entryPtr->selectLast = index2; } if (!(entryPtr->flags & GOT_SELECTION) && (entryPtr->exportSelection)) { Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection, (ClientData) entryPtr); entryPtr->flags |= GOT_SELECTION; } EventuallyRedraw(entryPtr); break; } case SELECTION_TO: { if (objc != 4) { Tcl_WrongNumArgs(interp, 1, objv, "selection to index"); goto error; } if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[3]), &index) != TCL_OK) { goto error; } EntrySelectTo(entryPtr, index); break; } } break; } case COMMAND_XVIEW: { int index; if (objc == 2) { double first, last; char buf[TCL_DOUBLE_SPACE * 2]; EntryVisibleRange(entryPtr, &first, &last); sprintf(buf, "%g %g", first, last); Tcl_SetResult(interp, buf, TCL_VOLATILE); goto done; } else if (objc == 3) { if (GetEntryIndex(interp, entryPtr, Tcl_GetString(objv[2]), &index) != TCL_OK) { goto error; } } else { double fraction; int count; index = entryPtr->leftIndex; switch (Tk_GetScrollInfoObj(interp, objc, objv, &fraction, &count)) { case TK_SCROLL_ERROR: { goto error; } case TK_SCROLL_MOVETO: { index = (int) ((fraction * entryPtr->numChars) + 0.5); break; } case TK_SCROLL_PAGES: { int charsPerPage; charsPerPage = ((Tk_Width(entryPtr->tkwin) - 2 * entryPtr->inset) / entryPtr->avgWidth) - 2; if (charsPerPage < 1) { charsPerPage = 1; } index += count * charsPerPage; break; } case TK_SCROLL_UNITS: { index += count; break; } } } if (index >= entryPtr->numChars) { index = entryPtr->numChars - 1; } if (index < 0) { index = 0; } entryPtr->leftIndex = index; entryPtr->flags |= UPDATE_SCROLLBAR; EntryComputeGeometry(entryPtr); EventuallyRedraw(entryPtr); break; } } done: Tcl_Release((ClientData) entryPtr); return result; error: Tcl_Release((ClientData) entryPtr); return TCL_ERROR; } /* *---------------------------------------------------------------------- * * DestroyEntry -- * * This procedure is invoked by Tcl_EventuallyFree or Tcl_Release * to clean up the internal structure of an entry at a safe time * (when no-one is using it anymore). * * Results: * None. * * Side effects: * Everything associated with the entry is freed up. * *---------------------------------------------------------------------- */ static void DestroyEntry(memPtr) char *memPtr; /* Info about entry widget. */ { Entry *entryPtr = (Entry *) memPtr; entryPtr->flags |= ENTRY_DELETED; Tcl_DeleteCommandFromToken(entryPtr->interp, entryPtr->widgetCmd); if (entryPtr->flags & REDRAW_PENDING) { Tcl_CancelIdleCall(DisplayEntry, (ClientData) entryPtr); } /* * Free up all the stuff that requires special handling, then * let Tk_FreeOptions handle all the standard option-related * stuff. */ ckfree(entryPtr->string); if (entryPtr->textVarName != NULL) { Tcl_UntraceVar(entryPtr->interp, entryPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, EntryTextVarProc, (ClientData) entryPtr); } if (entryPtr->textGC != None) { Tk_FreeGC(entryPtr->display, entryPtr->textGC); } if (entryPtr->selTextGC != None) { Tk_FreeGC(entryPtr->display, entryPtr->selTextGC); } Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler); if (entryPtr->displayString != entryPtr->string) { ckfree(entryPtr->displayString); } Tk_FreeTextLayout(entryPtr->textLayout); Tk_FreeConfigOptions((char *) entryPtr, entryPtr->optionTable, entryPtr->tkwin); entryPtr->tkwin = NULL; ckfree((char *) entryPtr); } /* *---------------------------------------------------------------------- * * ConfigureEntry -- * * This procedure is called to process an argv/argc list, plus * the Tk option database, in order to configure (or reconfigure) * an entry widget. * * Results: * The return value is a standard Tcl result. If TCL_ERROR is * returned, then the interp's result contains an error message. * * Side effects: * Configuration information, such as colors, border width, * etc. get set for entryPtr; old resources get freed, * if there were any. * *---------------------------------------------------------------------- */ static int ConfigureEntry(interp, entryPtr, objc, objv, flags) Tcl_Interp *interp; /* Used for error reporting. */ Entry *entryPtr; /* Information about widget; may or may not * already have values for some fields. */ int objc; /* Number of valid entries in argv. */ Tcl_Obj *CONST objv[]; /* Argument objects. */ int flags; /* Flags to pass to Tk_ConfigureWidget. */ { Tk_SavedOptions savedOptions; Tcl_Obj *errorResult = NULL; int error; int oldExport; /* * Eliminate any existing trace on a variable monitored by the entry. */ if (entryPtr->textVarName != NULL) { Tcl_UntraceVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, EntryTextVarProc, (ClientData) entryPtr); } oldExport = entryPtr->exportSelection; for (error = 0; error <= 1; error++) { if (!error) { /* * First pass: set options to new values. */ if (Tk_SetOptions(interp, (char *) entryPtr, entryPtr->optionTable, objc, objv, entryPtr->tkwin, &savedOptions, (int *) NULL) != TCL_OK) { continue; } } else { /* * Second pass: restore options to old values. */ errorResult = Tcl_GetObjResult(interp); Tcl_IncrRefCount(errorResult); Tk_RestoreSavedOptions(&savedOptions); } /* * A few other options also need special processing, such as parsing * the geometry and setting the background from a 3-D border. */ Tk_SetBackgroundFromBorder(entryPtr->tkwin, entryPtr->normalBorder); if (entryPtr->insertWidth <= 0) { entryPtr->insertWidth = 2; } if (entryPtr->insertBorderWidth > entryPtr->insertWidth/2) { entryPtr->insertBorderWidth = entryPtr->insertWidth/2; } /* * Restart the cursor timing sequence in case the on-time or * off-time just changed. */ if (entryPtr->flags & GOT_FOCUS) { EntryFocusProc(entryPtr, 1); } /* * Claim the selection if we've suddenly started exporting it. */ if (entryPtr->exportSelection && (!oldExport) && (entryPtr->selectFirst != -1) && !(entryPtr->flags & GOT_SELECTION)) { Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection, (ClientData) entryPtr); entryPtr->flags |= GOT_SELECTION; } /* * Recompute the window's geometry and arrange for it to be * redisplayed. */ Tk_SetInternalBorder(entryPtr->tkwin, entryPtr->borderWidth + entryPtr->highlightWidth); if (entryPtr->highlightWidth <= 0) { entryPtr->highlightWidth = 0; } entryPtr->inset = entryPtr->highlightWidth + entryPtr->borderWidth + XPAD; break; } if (!error) { Tk_FreeSavedOptions(&savedOptions); } /* * If the entry is tied to the value of a variable, then set up * a trace on the variable's value, create the variable if it doesn't * exist, and set the entry's value from the variable's value. */ if (entryPtr->textVarName != NULL) { char *value; value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY); if (value == NULL) { EntryValueChanged(entryPtr); } else { EntrySetValue(entryPtr, value); } Tcl_TraceVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, EntryTextVarProc, (ClientData) entryPtr); } EntryWorldChanged((ClientData) entryPtr); if (error) { Tcl_SetObjResult(interp, errorResult); Tcl_DecrRefCount(errorResult); return TCL_ERROR; } else { return TCL_OK; } } /* *--------------------------------------------------------------------------- * * EntryWorldChanged -- * * This procedure is called when the world has changed in some * way and the widget needs to recompute all its graphics contexts * and determine its new geometry. * * Results: * None. * * Side effects: * Entry will be relayed out and redisplayed. * *--------------------------------------------------------------------------- */ static void EntryWorldChanged(instanceData) ClientData instanceData; /* Information about widget. */ { XGCValues gcValues; GC gc; unsigned long mask; Entry *entryPtr; entryPtr = (Entry *) instanceData; entryPtr->avgWidth = Tk_TextWidth(entryPtr->tkfont, "0", 1); if (entryPtr->avgWidth == 0) { entryPtr->avgWidth = 1; } gcValues.foreground = entryPtr->fgColorPtr->pixel; gcValues.font = Tk_FontId(entryPtr->tkfont); gcValues.graphics_exposures = False; mask = GCForeground | GCFont | GCGraphicsExposures; gc = Tk_GetGC(entryPtr->tkwin, mask, &gcValues); if (entryPtr->textGC != None) { Tk_FreeGC(entryPtr->display, entryPtr->textGC); } entryPtr->textGC = gc; gcValues.foreground = entryPtr->selFgColorPtr->pixel; gcValues.font = Tk_FontId(entryPtr->tkfont); mask = GCForeground | GCFont; gc = Tk_GetGC(entryPtr->tkwin, mask, &gcValues); if (entryPtr->selTextGC != None) { Tk_FreeGC(entryPtr->display, entryPtr->selTextGC); } entryPtr->selTextGC = gc; /* * Recompute the window's geometry and arrange for it to be * redisplayed. */ EntryComputeGeometry(entryPtr); entryPtr->flags |= UPDATE_SCROLLBAR; EventuallyRedraw(entryPtr); } /* *-------------------------------------------------------------- * * DisplayEntry -- * * This procedure redraws the contents of an entry window. * * Results: * None. * * Side effects: * Information appears on the screen. * *-------------------------------------------------------------- */ static void DisplayEntry(clientData) ClientData clientData; /* Information about window. */ { Entry *entryPtr = (Entry *) clientData; Tk_Window tkwin = entryPtr->tkwin; int baseY, selStartX, selEndX, cursorX; int xBound; Tk_FontMetrics fm; Pixmap pixmap; int showSelection; char *string; entryPtr->flags &= ~REDRAW_PENDING; if ((entryPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) { return; } Tk_GetFontMetrics(entryPtr->tkfont, &fm); /* * Update the scrollbar if that's needed. */ if (entryPtr->flags & UPDATE_SCROLLBAR) { entryPtr->flags &= ~UPDATE_SCROLLBAR; EntryUpdateScrollbar(entryPtr); } /* * In order to avoid screen flashes, this procedure redraws the * textual area of the entry into off-screen memory, then copies * it back on-screen in a single operation. This means there's * no point in time where the on-screen image has been cleared. */ pixmap = Tk_GetPixmap(entryPtr->display, Tk_WindowId(tkwin), Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin)); /* * Compute x-coordinate of the pixel just after last visible * one, plus vertical position of baseline of text. */ xBound = Tk_Width(tkwin) - entryPtr->inset; baseY = (Tk_Height(tkwin) + fm.ascent - fm.descent) / 2; /* * On Windows and Mac, we need to hide the selection whenever we * don't have the focus. */ #ifdef ALWAYS_SHOW_SELECTION showSelection = 1; #else showSelection = (entryPtr->flags & GOT_FOCUS); #endif /* * Draw the background in three layers. From bottom to top the * layers are: normal background, selection background, and * insertion cursor background. */ Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->normalBorder, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin), 0, TK_RELIEF_FLAT); string = entryPtr->displayString; if (showSelection && (entryPtr->selectLast > entryPtr->leftIndex)) { if (entryPtr->selectFirst <= entryPtr->leftIndex) { selStartX = entryPtr->leftX; } else { Tk_CharBbox(entryPtr->textLayout, entryPtr->selectFirst, &selStartX, NULL, NULL, NULL); selStartX += entryPtr->layoutX; } if ((selStartX - entryPtr->selBorderWidth) < xBound) { Tk_CharBbox(entryPtr->textLayout, entryPtr->selectLast, &selEndX, NULL, NULL, NULL); selEndX += entryPtr->layoutX; Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->selBorder, selStartX - entryPtr->selBorderWidth, baseY - fm.ascent - entryPtr->selBorderWidth, (selEndX - selStartX) + 2*entryPtr->selBorderWidth, (fm.ascent + fm.descent) + 2*entryPtr->selBorderWidth, entryPtr->selBorderWidth, TK_RELIEF_RAISED); } } /* * Draw a special background for the insertion cursor, overriding * even the selection background. As a special hack to keep the * cursor visible when the insertion cursor color is the same as * the color for selected text (e.g., on mono displays), write * background in the cursor area (instead of nothing) when the * cursor isn't on. Otherwise the selection would hide the cursor. */ if ((entryPtr->insertPos >= entryPtr->leftIndex) && (entryPtr->state == STATE_NORMAL) && (entryPtr->flags & GOT_FOCUS)) { Tk_CharBbox(entryPtr->textLayout, entryPtr->insertPos, &cursorX, NULL, NULL, NULL); cursorX += entryPtr->layoutX; cursorX -= (entryPtr->insertWidth)/2; if (cursorX < xBound) { if (entryPtr->flags & CURSOR_ON) { Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->insertBorder, cursorX, baseY - fm.ascent, entryPtr->insertWidth, fm.ascent + fm.descent, entryPtr->insertBorderWidth, TK_RELIEF_RAISED); } else if (entryPtr->insertBorder == entryPtr->selBorder) { Tk_Fill3DRectangle(tkwin, pixmap, entryPtr->normalBorder, cursorX, baseY - fm.ascent, entryPtr->insertWidth, fm.ascent + fm.descent, 0, TK_RELIEF_FLAT); } } } /* * Draw the text in two pieces: first the unselected portion, then the * selected portion on top of it. */ Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->textGC, entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY, entryPtr->leftIndex, entryPtr->numChars); if (showSelection && (entryPtr->selTextGC != entryPtr->textGC) && (entryPtr->selectFirst < entryPtr->selectLast)) { int selFirst; if (entryPtr->selectFirst < entryPtr->leftIndex) { selFirst = entryPtr->leftIndex; } else { selFirst = entryPtr->selectFirst; } Tk_DrawTextLayout(entryPtr->display, pixmap, entryPtr->selTextGC, entryPtr->textLayout, entryPtr->layoutX, entryPtr->layoutY, selFirst, entryPtr->selectLast); } /* * Draw the border and focus highlight last, so they will overwrite * any text that extends past the viewable part of the window. */ if (entryPtr->relief != TK_RELIEF_FLAT) { Tk_Draw3DRectangle(tkwin, pixmap, entryPtr->normalBorder, entryPtr->highlightWidth, entryPtr->highlightWidth, Tk_Width(tkwin) - 2 * entryPtr->highlightWidth, Tk_Height(tkwin) - 2 * entryPtr->highlightWidth, entryPtr->borderWidth, entryPtr->relief); } if (entryPtr->highlightWidth != 0) { GC fgGC, bgGC; bgGC = Tk_GCForColor(entryPtr->highlightBgColorPtr, pixmap); if (entryPtr->flags & GOT_FOCUS) { fgGC = Tk_GCForColor(entryPtr->highlightColorPtr, pixmap); TkpDrawHighlightBorder(tkwin, fgGC, bgGC, entryPtr->highlightWidth, pixmap); } else { TkpDrawHighlightBorder(tkwin, bgGC, bgGC, entryPtr->highlightWidth, pixmap); } } /* * Everything's been redisplayed; now copy the pixmap onto the screen * and free up the pixmap. */ XCopyArea(entryPtr->display, pixmap, Tk_WindowId(tkwin), entryPtr->textGC, 0, 0, (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin), 0, 0); Tk_FreePixmap(entryPtr->display, pixmap); entryPtr->flags &= ~BORDER_NEEDED; } /* *---------------------------------------------------------------------- * * EntryComputeGeometry -- * * This procedure is invoked to recompute information about where * in its window an entry's string will be displayed. It also * computes the requested size for the window. * * Results: * None. * * Side effects: * The leftX and tabOrigin fields are recomputed for entryPtr, * and leftIndex may be adjusted. Tk_GeometryRequest is called * to register the desired dimensions for the window. * *---------------------------------------------------------------------- */ static void EntryComputeGeometry(entryPtr) Entry *entryPtr; /* Widget record for entry. */ { int totalLength, overflow, maxOffScreen, rightX; int height, width, i; Tk_FontMetrics fm; char *p; if (entryPtr->displayString != entryPtr->string) { ckfree(entryPtr->displayString); entryPtr->displayString = entryPtr->string; entryPtr->numDisplayBytes = entryPtr->numBytes; } /* * If we're displaying a special character instead of the value of * the entry, recompute the displayString. */ if (entryPtr->showChar != NULL) { Tcl_UniChar ch; char buf[TCL_UTF_MAX]; int size; /* * Normalize the special character so we can safely duplicate it * in the display string. If we didn't do this, then two malformed * characters might end up looking like one valid UTF character in * the resulting string. */ Tcl_UtfToUniChar(entryPtr->showChar, &ch); size = Tcl_UniCharToUtf(ch, buf); entryPtr->numDisplayBytes = entryPtr->numChars * size; entryPtr->displayString = (char *) ckalloc((unsigned) (entryPtr->numDisplayBytes + 1)); p = entryPtr->displayString; for (i = entryPtr->numChars; --i >= 0; ) { p += Tcl_UniCharToUtf(ch, p); } *p = '\0'; } Tk_FreeTextLayout(entryPtr->textLayout); entryPtr->textLayout = Tk_ComputeTextLayout(entryPtr->tkfont, entryPtr->displayString, entryPtr->numChars, 0, entryPtr->justify, TK_IGNORE_NEWLINES, &totalLength, &height); entryPtr->layoutY = (Tk_Height(entryPtr->tkwin) - height) / 2; /* * Recompute where the leftmost character on the display will * be drawn (entryPtr->leftX) and adjust leftIndex if necessary * so that we don't let characters hang off the edge of the * window unless the entire window is full. */ overflow = totalLength - (Tk_Width(entryPtr->tkwin) - 2*entryPtr->inset); if (overflow <= 0) { entryPtr->leftIndex = 0; if (entryPtr->justify == TK_JUSTIFY_LEFT) { entryPtr->leftX = entryPtr->inset; } else if (entryPtr->justify == TK_JUSTIFY_RIGHT) { entryPtr->leftX = Tk_Width(entryPtr->tkwin) - entryPtr->inset - totalLength; } else { entryPtr->leftX = (Tk_Width(entryPtr->tkwin) - totalLength)/2; } entryPtr->layoutX = entryPtr->leftX; } else { /* * The whole string can't fit in the window. Compute the * maximum number of characters that may be off-screen to * the left without leaving empty space on the right of the * window, then don't let leftIndex be any greater than that. */ maxOffScreen = Tk_PointToChar(entryPtr->textLayout, overflow, 0); Tk_CharBbox(entryPtr->textLayout, maxOffScreen, &rightX, NULL, NULL, NULL); if (rightX < overflow) { maxOffScreen++; } if (entryPtr->leftIndex > maxOffScreen) { entryPtr->leftIndex = maxOffScreen; } Tk_CharBbox(entryPtr->textLayout, entryPtr->leftIndex, &rightX, NULL, NULL, NULL); entryPtr->leftX = entryPtr->inset; entryPtr->layoutX = entryPtr->leftX - rightX; } Tk_GetFontMetrics(entryPtr->tkfont, &fm); height = fm.linespace + 2*entryPtr->inset + 2*(YPAD-XPAD); if (entryPtr->prefWidth > 0) { width = entryPtr->prefWidth*entryPtr->avgWidth + 2*entryPtr->inset; } else { if (totalLength == 0) { width = entryPtr->avgWidth + 2*entryPtr->inset; } else { width = totalLength + 2*entryPtr->inset; } } Tk_GeometryRequest(entryPtr->tkwin, width, height); } /* *---------------------------------------------------------------------- * * InsertChars -- * * Add new characters to an entry widget. * * Results: * None. * * Side effects: * New information gets added to entryPtr; it will be redisplayed * soon, but not necessarily immediately. * *---------------------------------------------------------------------- */ static void InsertChars(entryPtr, index, value) Entry *entryPtr; /* Entry that is to get the new elements. */ int index; /* Add the new elements before this * character index. */ char *value; /* New characters to add (NULL-terminated * string). */ { int byteIndex, byteCount, oldChars, charsAdded, newByteCount; char *new, *string; string = entryPtr->string; byteIndex = Tcl_UtfAtIndex(string, index) - string; byteCount = strlen(value); if (byteCount == 0) { return; } newByteCount = entryPtr->numBytes + byteCount + 1; new = (char *) ckalloc((unsigned) newByteCount); memcpy(new, string, (size_t) byteIndex); strcpy(new + byteIndex, value); strcpy(new + byteIndex + byteCount, string + byteIndex); ckfree(string); entryPtr->string = new; /* * The following construction is used because inserting improperly * formed UTF-8 sequences between other improperly formed UTF-8 * sequences could result in actually forming valid UTF-8 sequences; * the number of characters added may not be Tcl_NumUtfChars(string, -1), * because of context. The actual number of characters added is how * many characters are in the string now minus the number that * used to be there. */ oldChars = entryPtr->numChars; entryPtr->numChars = Tcl_NumUtfChars(new, -1); charsAdded = entryPtr->numChars - oldChars; entryPtr->numBytes += byteCount; if (entryPtr->displayString == string) { entryPtr->displayString = new; entryPtr->numDisplayBytes = entryPtr->numBytes; } /* * Inserting characters invalidates all indexes into the string. * Touch up the indexes so that they still refer to the same * characters (at new positions). When updating the selection * end-points, don't include the new text in the selection unless * it was completely surrounded by the selection. */ if (entryPtr->selectFirst >= index) { entryPtr->selectFirst += charsAdded; } if (entryPtr->selectLast > index) { entryPtr->selectLast += charsAdded; } if ((entryPtr->selectAnchor > index) || (entryPtr->selectFirst >= index)) { entryPtr->selectAnchor += charsAdded; } if (entryPtr->leftIndex > index) { entryPtr->leftIndex += charsAdded; } if (entryPtr->insertPos >= index) { entryPtr->insertPos += charsAdded; } EntryValueChanged(entryPtr); } /* *---------------------------------------------------------------------- * * DeleteChars -- * * Remove one or more characters from an entry widget. * * Results: * None. * * Side effects: * Memory gets freed, the entry gets modified and (eventually) * redisplayed. * *---------------------------------------------------------------------- */ static void DeleteChars(entryPtr, index, count) Entry *entryPtr; /* Entry widget to modify. */ int index; /* Index of first character to delete. */ int count; /* How many characters to delete. */ { int byteIndex, byteCount, newByteCount; char *new, *string; if ((index + count) > entryPtr->numChars) { count = entryPtr->numChars - index; } if (count <= 0) { return; } string = entryPtr->string; byteIndex = Tcl_UtfAtIndex(string, index) - string; byteCount = Tcl_UtfAtIndex(string + byteIndex, count) - (string + byteIndex); newByteCount = entryPtr->numBytes + 1 - byteCount; new = (char *) ckalloc((unsigned) newByteCount); memcpy(new, string, (size_t) byteIndex); strcpy(new + byteIndex, string + byteIndex + byteCount); ckfree(entryPtr->string); entryPtr->string = new; entryPtr->numChars -= count; entryPtr->numBytes -= byteCount; if (entryPtr->displayString == string) { entryPtr->displayString = new; entryPtr->numDisplayBytes = entryPtr->numBytes; } /* * Deleting characters results in the remaining characters being * renumbered. Update the various indexes into the string to reflect * this change. */ if (entryPtr->selectFirst >= index) { if (entryPtr->selectFirst >= (index + count)) { entryPtr->selectFirst -= count; } else { entryPtr->selectFirst = index; } } if (entryPtr->selectLast >= index) { if (entryPtr->selectLast >= (index + count)) { entryPtr->selectLast -= count; } else { entryPtr->selectLast = index; } } if (entryPtr->selectLast <= entryPtr->selectFirst) { entryPtr->selectFirst = -1; entryPtr->selectLast = -1; } if (entryPtr->selectAnchor >= index) { if (entryPtr->selectAnchor >= (index+count)) { entryPtr->selectAnchor -= count; } else { entryPtr->selectAnchor = index; } } if (entryPtr->leftIndex > index) { if (entryPtr->leftIndex >= (index + count)) { entryPtr->leftIndex -= count; } else { entryPtr->leftIndex = index; } } if (entryPtr->insertPos >= index) { if (entryPtr->insertPos >= (index + count)) { entryPtr->insertPos -= count; } else { entryPtr->insertPos = index; } } EntryValueChanged(entryPtr); } /* *---------------------------------------------------------------------- * * EntryValueChanged -- * * This procedure is invoked when characters are inserted into * an entry or deleted from it. It updates the entry's associated * variable, if there is one, and does other bookkeeping such * as arranging for redisplay. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void EntryValueChanged(entryPtr) Entry *entryPtr; /* Entry whose value just changed. */ { char *newValue; if (entryPtr->textVarName == NULL) { newValue = NULL; } else { newValue = Tcl_SetVar(entryPtr->interp, entryPtr->textVarName, entryPtr->string, TCL_GLOBAL_ONLY); } if ((newValue != NULL) && (strcmp(newValue, entryPtr->string) != 0)) { /* * The value of the variable is different than what we asked for. * This means that a trace on the variable modified it. In this * case our trace procedure wasn't invoked since the modification * came while a trace was already active on the variable. So, * update our value to reflect the variable's latest value. */ EntrySetValue(entryPtr, newValue); } else { /* * Arrange for redisplay. */ entryPtr->flags |= UPDATE_SCROLLBAR; EntryComputeGeometry(entryPtr); EventuallyRedraw(entryPtr); } } /* *---------------------------------------------------------------------- * * EntrySetValue -- * * Replace the contents of a text entry with a given value. This * procedure is invoked when updating the entry from the entry's * associated variable. * * Results: * None. * * Side effects: * The string displayed in the entry will change. The selection, * insertion point, and view may have to be adjusted to keep them * within the bounds of the new string. Note: this procedure does * *not* update the entry's associated variable, since that could * result in an infinite loop. * *---------------------------------------------------------------------- */ static void EntrySetValue(entryPtr, value) Entry *entryPtr; /* Entry whose value is to be changed. */ char *value; /* New text to display in entry. */ { char *oldSource; oldSource = entryPtr->string; ckfree(entryPtr->string); entryPtr->numBytes = strlen(value); entryPtr->numChars = Tcl_NumUtfChars(value, entryPtr->numBytes); entryPtr->string = (char *) ckalloc((unsigned) (entryPtr->numBytes + 1)); strcpy(entryPtr->string, value); if (entryPtr->displayString == oldSource) { entryPtr->displayString = entryPtr->string; entryPtr->numDisplayBytes = entryPtr->numBytes; } if (entryPtr->selectFirst >= 0) { if (entryPtr->selectFirst >= entryPtr->numChars) { entryPtr->selectFirst = -1; entryPtr->selectLast = -1; } else if (entryPtr->selectLast > entryPtr->numChars) { entryPtr->selectLast = entryPtr->numChars; } } if (entryPtr->leftIndex >= entryPtr->numChars) { if (entryPtr->numChars > 0) { entryPtr->leftIndex = entryPtr->numChars - 1; } else { entryPtr->leftIndex = 0; } } if (entryPtr->insertPos > entryPtr->numChars) { entryPtr->insertPos = entryPtr->numChars; } entryPtr->flags |= UPDATE_SCROLLBAR; EntryComputeGeometry(entryPtr); EventuallyRedraw(entryPtr); } /* *-------------------------------------------------------------- * * EntryEventProc -- * * This procedure is invoked by the Tk dispatcher for various * events on entryes. * * Results: * None. * * Side effects: * When the window gets deleted, internal structures get * cleaned up. When it gets exposed, it is redisplayed. * *-------------------------------------------------------------- */ static void EntryEventProc(clientData, eventPtr) ClientData clientData; /* Information about window. */ XEvent *eventPtr; /* Information about event. */ { Entry *entryPtr = (Entry *) clientData; if (eventPtr->type == Expose) { EventuallyRedraw(entryPtr); entryPtr->flags |= BORDER_NEEDED; } else if (eventPtr->type == DestroyNotify) { DestroyEntry((char *) clientData); } else if (eventPtr->type == ConfigureNotify) { Tcl_Preserve((ClientData) entryPtr); entryPtr->flags |= UPDATE_SCROLLBAR; EntryComputeGeometry(entryPtr); EventuallyRedraw(entryPtr); Tcl_Release((ClientData) entryPtr); } else if (eventPtr->type == FocusIn) { if (eventPtr->xfocus.detail != NotifyInferior) { EntryFocusProc(entryPtr, 1); } } else if (eventPtr->type == FocusOut) { if (eventPtr->xfocus.detail != NotifyInferior) { EntryFocusProc(entryPtr, 0); } } } /* *---------------------------------------------------------------------- * * EntryCmdDeletedProc -- * * This procedure is invoked when a widget command is deleted. If * the widget isn't already in the process of being destroyed, * this command destroys it. * * Results: * None. * * Side effects: * The widget is destroyed. * *---------------------------------------------------------------------- */ static void EntryCmdDeletedProc(clientData) ClientData clientData; /* Pointer to widget record for widget. */ { Entry *entryPtr = (Entry *) clientData; /* * This procedure could be invoked either because the window was * destroyed and the command was then deleted (in which case tkwin * is NULL) or because the command was deleted, and then this procedure * destroys the widget. */ if (!(entryPtr->flags & ENTRY_DELETED)) { Tk_DestroyWindow(entryPtr->tkwin); } } /* *--------------------------------------------------------------------------- * * GetEntryIndex -- * * Parse an index into an entry and return either its value * or an error. * * Results: * A standard Tcl result. If all went well, then *indexPtr is * filled in with the character index (into entryPtr) corresponding to * string. The index value is guaranteed to lie between 0 and * the number of characters in the string, inclusive. If an * error occurs then an error message is left in the interp's result. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static int GetEntryIndex(interp, entryPtr, string, indexPtr) Tcl_Interp *interp; /* For error messages. */ Entry *entryPtr; /* Entry for which the index is being * specified. */ char *string; /* Specifies character in entryPtr. */ int *indexPtr; /* Where to store converted character * index. */ { size_t length; length = strlen(string); if (string[0] == 'a') { if (strncmp(string, "anchor", length) == 0) { *indexPtr = entryPtr->selectAnchor; } else { badIndex: /* * Some of the paths here leave messages in the interp's result, * so we have to clear it out before storing our own message. */ Tcl_SetResult(interp, (char *) NULL, TCL_STATIC); Tcl_AppendResult(interp, "bad entry index \"", string, "\"", (char *) NULL); return TCL_ERROR; } } else if (string[0] == 'e') { if (strncmp(string, "end", length) == 0) { *indexPtr = entryPtr->numChars; } else { goto badIndex; } } else if (string[0] == 'i') { if (strncmp(string, "insert", length) == 0) { *indexPtr = entryPtr->insertPos; } else { goto badIndex; } } else if (string[0] == 's') { if (entryPtr->selectFirst < 0) { Tcl_SetResult(interp, "selection isn't in entry", TCL_STATIC); return TCL_ERROR; } if (length < 5) { goto badIndex; } if (strncmp(string, "sel.first", length) == 0) { *indexPtr = entryPtr->selectFirst; } else if (strncmp(string, "sel.last", length) == 0) { *indexPtr = entryPtr->selectLast; } else { goto badIndex; } } else if (string[0] == '@') { int x, roundUp; if (Tcl_GetInt(interp, string + 1, &x) != TCL_OK) { goto badIndex; } if (x < entryPtr->inset) { x = entryPtr->inset; } roundUp = 0; if (x >= (Tk_Width(entryPtr->tkwin) - entryPtr->inset)) { x = Tk_Width(entryPtr->tkwin) - entryPtr->inset - 1; roundUp = 1; } *indexPtr = Tk_PointToChar(entryPtr->textLayout, x - entryPtr->layoutX, 0); /* * Special trick: if the x-position was off-screen to the right, * round the index up to refer to the character just after the * last visible one on the screen. This is needed to enable the * last character to be selected, for example. */ if (roundUp && (*indexPtr < entryPtr->numChars)) { *indexPtr += 1; } } else { if (Tcl_GetInt(interp, string, indexPtr) != TCL_OK) { goto badIndex; } if (*indexPtr < 0){ *indexPtr = 0; } else if (*indexPtr > entryPtr->numChars) { *indexPtr = entryPtr->numChars; } } return TCL_OK; } /* *---------------------------------------------------------------------- * * EntryScanTo -- * * Given a y-coordinate (presumably of the curent mouse location) * drag the view in the window to implement the scan operation. * * Results: * None. * * Side effects: * The view in the window may change. * *---------------------------------------------------------------------- */ static void EntryScanTo(entryPtr, x) Entry *entryPtr; /* Information about widget. */ int x; /* X-coordinate to use for scan operation. */ { int newLeftIndex; /* * Compute new leftIndex for entry by amplifying the difference * between the current position and the place where the scan * started (the "mark" position). If we run off the left or right * side of the entry, then reset the mark point so that the current * position continues to correspond to the edge of the window. * This means that the picture will start dragging as soon as the * mouse reverses direction (without this reset, might have to slide * mouse a long ways back before the picture starts moving again). */ newLeftIndex = entryPtr->scanMarkIndex - (10 * (x - entryPtr->scanMarkX)) / entryPtr->avgWidth; if (newLeftIndex >= entryPtr->numChars) { newLeftIndex = entryPtr->scanMarkIndex = entryPtr->numChars - 1; entryPtr->scanMarkX = x; } if (newLeftIndex < 0) { newLeftIndex = entryPtr->scanMarkIndex = 0; entryPtr->scanMarkX = x; } if (newLeftIndex != entryPtr->leftIndex) { entryPtr->leftIndex = newLeftIndex; entryPtr->flags |= UPDATE_SCROLLBAR; EntryComputeGeometry(entryPtr); if (newLeftIndex != entryPtr->leftIndex) { entryPtr->scanMarkIndex = entryPtr->leftIndex; entryPtr->scanMarkX = x; } EventuallyRedraw(entryPtr); } } /* *---------------------------------------------------------------------- * * EntrySelectTo -- * * Modify the selection by moving its un-anchored end. This could * make the selection either larger or smaller. * * Results: * None. * * Side effects: * The selection changes. * *---------------------------------------------------------------------- */ static void EntrySelectTo(entryPtr, index) Entry *entryPtr; /* Information about widget. */ int index; /* Character index of element that is to * become the "other" end of the selection. */ { int newFirst, newLast; /* * Grab the selection if we don't own it already. */ if (!(entryPtr->flags & GOT_SELECTION) && (entryPtr->exportSelection)) { Tk_OwnSelection(entryPtr->tkwin, XA_PRIMARY, EntryLostSelection, (ClientData) entryPtr); entryPtr->flags |= GOT_SELECTION; } /* * Pick new starting and ending points for the selection. */ if (entryPtr->selectAnchor > entryPtr->numChars) { entryPtr->selectAnchor = entryPtr->numChars; } if (entryPtr->selectAnchor <= index) { newFirst = entryPtr->selectAnchor; newLast = index; } else { newFirst = index; newLast = entryPtr->selectAnchor; if (newLast < 0) { newFirst = newLast = -1; } } if ((entryPtr->selectFirst == newFirst) && (entryPtr->selectLast == newLast)) { return; } entryPtr->selectFirst = newFirst; entryPtr->selectLast = newLast; EventuallyRedraw(entryPtr); } /* *---------------------------------------------------------------------- * * EntryFetchSelection -- * * This procedure is called back by Tk when the selection is * requested by someone. It returns part or all of the selection * in a buffer provided by the caller. * * Results: * The return value is the number of non-NULL bytes stored * at buffer. Buffer is filled (or partially filled) with a * NULL-terminated string containing part or all of the selection, * as given by offset and maxBytes. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int EntryFetchSelection(clientData, offset, buffer, maxBytes) ClientData clientData; /* Information about entry widget. */ int offset; /* Byte offset within selection of first * character to be returned. */ char *buffer; /* Location in which to place selection. */ int maxBytes; /* Maximum number of bytes to place at * buffer, not including terminating NULL * character. */ { Entry *entryPtr = (Entry *) clientData; int byteCount; char *string, *selStart, *selEnd; if ((entryPtr->selectFirst < 0) || !(entryPtr->exportSelection)) { return -1; } string = entryPtr->displayString; selStart = Tcl_UtfAtIndex(string, entryPtr->selectFirst); selEnd = Tcl_UtfAtIndex(selStart, entryPtr->selectLast - entryPtr->selectFirst); byteCount = selEnd - selStart - offset; if (byteCount > maxBytes) { byteCount = maxBytes; } if (byteCount <= 0) { return 0; } memcpy(buffer, selStart + offset, (size_t) byteCount); buffer[byteCount] = '\0'; return byteCount; } /* *---------------------------------------------------------------------- * * EntryLostSelection -- * * This procedure is called back by Tk when the selection is * grabbed away from an entry widget. * * Results: * None. * * Side effects: * The existing selection is unhighlighted, and the window is * marked as not containing a selection. * *---------------------------------------------------------------------- */ static void EntryLostSelection(clientData) ClientData clientData; /* Information about entry widget. */ { Entry *entryPtr = (Entry *) clientData; entryPtr->flags &= ~GOT_SELECTION; /* * On Windows and Mac systems, we want to remember the selection * for the next time the focus enters the window. On Unix, we need * to clear the selection since it is always visible. */ #ifdef ALWAYS_SHOW_SELECTION if ((entryPtr->selectFirst >= 0) && entryPtr->exportSelection) { entryPtr->selectFirst = -1; entryPtr->selectLast = -1; EventuallyRedraw(entryPtr); } #endif } /* *---------------------------------------------------------------------- * * EventuallyRedraw -- * * Ensure that an entry is eventually redrawn on the display. * * Results: * None. * * Side effects: * Information gets redisplayed. Right now we don't do selective * redisplays: the whole window will be redrawn. This doesn't * seem to hurt performance noticeably, but if it does then this * could be changed. * *---------------------------------------------------------------------- */ static void EventuallyRedraw(entryPtr) Entry *entryPtr; /* Information about widget. */ { if ((entryPtr->tkwin == NULL) || !Tk_IsMapped(entryPtr->tkwin)) { return; } /* * Right now we don't do selective redisplays: the whole window * will be redrawn. This doesn't seem to hurt performance noticeably, * but if it does then this could be changed. */ if (!(entryPtr->flags & REDRAW_PENDING)) { entryPtr->flags |= REDRAW_PENDING; Tcl_DoWhenIdle(DisplayEntry, (ClientData) entryPtr); } } /* *---------------------------------------------------------------------- * * EntryVisibleRange -- * * Return information about the range of the entry that is * currently visible. * * Results: * *firstPtr and *lastPtr are modified to hold fractions between * 0 and 1 identifying the range of characters visible in the * entry. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void EntryVisibleRange(entryPtr, firstPtr, lastPtr) Entry *entryPtr; /* Information about widget. */ double *firstPtr; /* Return position of first visible * character in widget. */ double *lastPtr; /* Return position of char just after last * visible one. */ { int charsInWindow; if (entryPtr->numChars == 0) { *firstPtr = 0.0; *lastPtr = 1.0; } else { charsInWindow = Tk_PointToChar(entryPtr->textLayout, Tk_Width(entryPtr->tkwin) - entryPtr->inset - entryPtr->layoutX - 1, 0); if (charsInWindow < entryPtr->numChars) { charsInWindow++; } charsInWindow -= entryPtr->leftIndex; if (charsInWindow == 0) { charsInWindow = 1; } *firstPtr = (double) entryPtr->leftIndex / entryPtr->numChars; *lastPtr = (double) (entryPtr->leftIndex + charsInWindow) / entryPtr->numChars; } } /* *---------------------------------------------------------------------- * * EntryUpdateScrollbar -- * * This procedure is invoked whenever information has changed in * an entry in a way that would invalidate a scrollbar display. * If there is an associated scrollbar, then this procedure updates * it by invoking a Tcl command. * * Results: * None. * * Side effects: * A Tcl command is invoked, and an additional command may be * invoked to process errors in the command. * *---------------------------------------------------------------------- */ static void EntryUpdateScrollbar(entryPtr) Entry *entryPtr; /* Information about widget. */ { char args[TCL_DOUBLE_SPACE * 2]; int code; double first, last; Tcl_Interp *interp; if (entryPtr->scrollCmd == NULL) { return; } interp = entryPtr->interp; Tcl_Preserve((ClientData) interp); EntryVisibleRange(entryPtr, &first, &last); sprintf(args, " %g %g", first, last); code = Tcl_VarEval(interp, entryPtr->scrollCmd, args, (char *) NULL); if (code != TCL_OK) { Tcl_AddErrorInfo(interp, "\n (horizontal scrolling command executed by entry)"); Tcl_BackgroundError(interp); } Tcl_SetResult(interp, (char *) NULL, TCL_STATIC); Tcl_Release((ClientData) interp); } /* *---------------------------------------------------------------------- * * EntryBlinkProc -- * * This procedure is called as a timer handler to blink the * insertion cursor off and on. * * Results: * None. * * Side effects: * The cursor gets turned on or off, redisplay gets invoked, * and this procedure reschedules itself. * *---------------------------------------------------------------------- */ static void EntryBlinkProc(clientData) ClientData clientData; /* Pointer to record describing entry. */ { Entry *entryPtr = (Entry *) clientData; if (!(entryPtr->flags & GOT_FOCUS) || (entryPtr->insertOffTime == 0)) { return; } if (entryPtr->flags & CURSOR_ON) { entryPtr->flags &= ~CURSOR_ON; entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler( entryPtr->insertOffTime, EntryBlinkProc, (ClientData) entryPtr); } else { entryPtr->flags |= CURSOR_ON; entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler( entryPtr->insertOnTime, EntryBlinkProc, (ClientData) entryPtr); } EventuallyRedraw(entryPtr); } /* *---------------------------------------------------------------------- * * EntryFocusProc -- * * This procedure is called whenever the entry gets or loses the * input focus. It's also called whenever the window is reconfigured * while it has the focus. * * Results: * None. * * Side effects: * The cursor gets turned on or off. * *---------------------------------------------------------------------- */ static void EntryFocusProc(entryPtr, gotFocus) Entry *entryPtr; /* Entry that got or lost focus. */ int gotFocus; /* 1 means window is getting focus, 0 means * it's losing it. */ { Tcl_DeleteTimerHandler(entryPtr->insertBlinkHandler); if (gotFocus) { entryPtr->flags |= GOT_FOCUS | CURSOR_ON; if (entryPtr->insertOffTime != 0) { entryPtr->insertBlinkHandler = Tcl_CreateTimerHandler( entryPtr->insertOnTime, EntryBlinkProc, (ClientData) entryPtr); } } else { entryPtr->flags &= ~(GOT_FOCUS | CURSOR_ON); entryPtr->insertBlinkHandler = (Tcl_TimerToken) NULL; } EventuallyRedraw(entryPtr); } /* *-------------------------------------------------------------- * * EntryTextVarProc -- * * This procedure is invoked when someone changes the variable * whose contents are to be displayed in an entry. * * Results: * NULL is always returned. * * Side effects: * The text displayed in the entry will change to match the * variable. * *-------------------------------------------------------------- */ /* ARGSUSED */ static char * EntryTextVarProc(clientData, interp, name1, name2, flags) ClientData clientData; /* Information about button. */ Tcl_Interp *interp; /* Interpreter containing variable. */ char *name1; /* Not used. */ char *name2; /* Not used. */ int flags; /* Information about what happened. */ { Entry *entryPtr = (Entry *) clientData; char *value; /* * If the variable is unset, then immediately recreate it unless * the whole interpreter is going away. */ if (flags & TCL_TRACE_UNSETS) { if ((flags & TCL_TRACE_DESTROYED) && !(flags & TCL_INTERP_DESTROYED)) { Tcl_SetVar(interp, entryPtr->textVarName, entryPtr->string, TCL_GLOBAL_ONLY); Tcl_TraceVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, EntryTextVarProc, clientData); } return (char *) NULL; } /* * Update the entry's text with the value of the variable, unless * the entry already has that value (this happens when the variable * changes value because we changed it because someone typed in * the entry). */ value = Tcl_GetVar(interp, entryPtr->textVarName, TCL_GLOBAL_ONLY); if (value == NULL) { value = ""; } if (strcmp(value, entryPtr->string) != 0) { EntrySetValue(entryPtr, value); } return (char *) NULL; }