/* * tkMessage.c -- * * This module implements a message widgets for the Tk * toolkit. A message widget displays a multi-line string * in a window according to a particular aspect ratio. * * Copyright (c) 1990-1994 The Regents of the University of California. * Copyright (c) 1994-1997 Sun Microsystems, Inc. * Copyright (c) 1998-2000 by Ajuba Solutions. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tkMessage.c,v 1.14.2.1 2006/05/25 23:51:22 hobbs Exp $ */ #include "tkPort.h" #include "default.h" #include "tkInt.h" /* * A data structure of the following type is kept for each message * widget managed by this file: */ typedef struct { Tk_Window tkwin; /* Window that embodies the message. NULL * means that the window has been destroyed * but the data structures haven't yet been * cleaned up.*/ Tk_OptionTable optionTable; /* Table that defines options available for * this widget. */ 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 message. */ Tcl_Command widgetCmd; /* Token for message's widget command. */ /* * Information used when displaying widget: */ char *string; /* String displayed in message. */ int numChars; /* Number of characters in string, not * including terminating NULL. */ char *textVarName; /* Name of variable (malloc'ed) or NULL. * If non-NULL, message displays the contents * of this variable. */ Tk_3DBorder border; /* Structure used to draw 3-D border and * background. NULL means a border hasn't * been created yet. */ int borderWidth; /* Width of border. */ int relief; /* 3-D effect: TK_RELIEF_RAISED, etc. */ int highlightWidth; /* Width in pixels of highlight to draw * around widget when it has the focus. * <= 0 means don't draw a highlight. */ XColor *highlightBgColorPtr; /* Color for drawing traversal highlight * area when highlight is off. */ XColor *highlightColorPtr; /* Color for drawing traversal highlight. */ Tk_Font tkfont; /* Information about text font, or NULL. */ XColor *fgColorPtr; /* Foreground color in normal mode. */ Tcl_Obj *padXPtr, *padYPtr; /* Tcl_Obj rep's of padX, padY values. */ int padX, padY; /* User-requested extra space around text. */ int width; /* User-requested width, in pixels. 0 means * compute width using aspect ratio below. */ int aspect; /* Desired aspect ratio for window * (100*width/height). */ int msgWidth; /* Width in pixels needed to display * message. */ int msgHeight; /* Height in pixels needed to display * message. */ Tk_Anchor anchor; /* Where to position text within window region * if window is larger or smaller than * needed. */ Tk_Justify justify; /* Justification for text. */ GC textGC; /* GC for drawing text in normal mode. */ Tk_TextLayout textLayout; /* Saved layout information. */ /* * Miscellaneous information: */ Tk_Cursor cursor; /* Current cursor for window, or None. */ 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 flags; /* Various flags; see below for * definitions. */ } Message; /* * Flag bits for messages: * * REDRAW_PENDING: Non-zero means a DoWhenIdle handler * has already been queued to redraw * this window. * GOT_FOCUS: Non-zero means this button currently * has the input focus. * MESSAGE_DELETED: The message has been effectively deleted. */ #define REDRAW_PENDING 1 #define GOT_FOCUS 4 #define MESSAGE_DELETED 8 /* * Information used for argv parsing. */ static Tk_OptionSpec optionSpecs[] = { {TK_OPTION_ANCHOR, "-anchor", "anchor", "Anchor", DEF_MESSAGE_ANCHOR, -1, Tk_Offset(Message, anchor), 0, 0, 0}, {TK_OPTION_INT, "-aspect", "aspect", "Aspect", DEF_MESSAGE_ASPECT, -1, Tk_Offset(Message, aspect), 0, 0, 0}, {TK_OPTION_BORDER, "-background", "background", "Background", DEF_MESSAGE_BG_COLOR, -1, Tk_Offset(Message, border), 0, (ClientData) DEF_MESSAGE_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_MESSAGE_BORDER_WIDTH, -1, Tk_Offset(Message, borderWidth), 0, 0, 0}, {TK_OPTION_CURSOR, "-cursor", "cursor", "Cursor", DEF_MESSAGE_CURSOR, -1, Tk_Offset(Message, cursor), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_SYNONYM, "-fg", (char *) NULL, (char *) NULL, (char *) NULL, 0, -1, 0, (ClientData) "-foreground", 0}, {TK_OPTION_FONT, "-font", "font", "Font", DEF_MESSAGE_FONT, -1, Tk_Offset(Message, tkfont), 0, 0, 0}, {TK_OPTION_COLOR, "-foreground", "foreground", "Foreground", DEF_MESSAGE_FG, -1, Tk_Offset(Message, fgColorPtr), 0, 0, 0}, {TK_OPTION_COLOR, "-highlightbackground", "highlightBackground", "HighlightBackground", DEF_MESSAGE_HIGHLIGHT_BG, -1, Tk_Offset(Message, highlightBgColorPtr), 0, 0}, {TK_OPTION_COLOR, "-highlightcolor", "highlightColor", "HighlightColor", DEF_MESSAGE_HIGHLIGHT, -1, Tk_Offset(Message, highlightColorPtr), 0, 0, 0}, {TK_OPTION_PIXELS, "-highlightthickness", "highlightThickness", "HighlightThickness", DEF_MESSAGE_HIGHLIGHT_WIDTH, -1, Tk_Offset(Message, highlightWidth), 0, 0, 0}, {TK_OPTION_JUSTIFY, "-justify", "justify", "Justify", DEF_MESSAGE_JUSTIFY, -1, Tk_Offset(Message, justify), 0, 0, 0}, {TK_OPTION_PIXELS, "-padx", "padX", "Pad", DEF_MESSAGE_PADX, Tk_Offset(Message, padXPtr), Tk_Offset(Message, padX), 0, 0, 0}, {TK_OPTION_PIXELS, "-pady", "padY", "Pad", DEF_MESSAGE_PADY, Tk_Offset(Message, padYPtr), Tk_Offset(Message, padY), 0, 0, 0}, {TK_OPTION_RELIEF, "-relief", "relief", "Relief", DEF_MESSAGE_RELIEF, -1, Tk_Offset(Message, relief), 0, 0, 0}, {TK_OPTION_STRING, "-takefocus", "takeFocus", "TakeFocus", DEF_MESSAGE_TAKE_FOCUS, -1, Tk_Offset(Message, takeFocus), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_STRING, "-text", "text", "Text", DEF_MESSAGE_TEXT, -1, Tk_Offset(Message, string), 0, 0, 0}, {TK_OPTION_STRING, "-textvariable", "textVariable", "Variable", DEF_MESSAGE_TEXT_VARIABLE, -1, Tk_Offset(Message, textVarName), TK_OPTION_NULL_OK, 0, 0}, {TK_OPTION_PIXELS, "-width", "width", "Width", DEF_MESSAGE_WIDTH, -1, Tk_Offset(Message, width), 0, 0 ,0}, {TK_OPTION_END, (char *) NULL, (char *) NULL, (char *) NULL, (char *) NULL, 0, 0, 0, 0} }; /* * Forward declarations for procedures defined later in this file: */ static void MessageCmdDeletedProc _ANSI_ARGS_(( ClientData clientData)); static void MessageEventProc _ANSI_ARGS_((ClientData clientData, XEvent *eventPtr)); static char * MessageTextVarProc _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, CONST char *name1, CONST char *name2, int flags)); static int MessageWidgetObjCmd _ANSI_ARGS_((ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])); static void MessageWorldChanged _ANSI_ARGS_(( ClientData instanceData)); static void ComputeMessageGeometry _ANSI_ARGS_((Message *msgPtr)); static int ConfigureMessage _ANSI_ARGS_((Tcl_Interp *interp, Message *msgPtr, int objc, Tcl_Obj *CONST objv[], int flags)); static void DestroyMessage _ANSI_ARGS_((char *memPtr)); static void DisplayMessage _ANSI_ARGS_((ClientData clientData)); /* * The structure below defines message class behavior by means of procedures * that can be invoked from generic window code. */ static Tk_ClassProcs messageClass = { sizeof(Tk_ClassProcs), /* size */ MessageWorldChanged, /* worldChangedProc */ }; /* *-------------------------------------------------------------- * * Tk_MessageObjCmd -- * * This procedure is invoked to process the "message" 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_MessageObjCmd(clientData, interp, objc, objv) ClientData clientData; /* NULL. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument strings. */ { register Message *msgPtr; Tk_OptionTable optionTable; Tk_Window tkwin; 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; } /* * Create the option table for this widget class. If it has already * been created, the cached pointer will be returned. */ optionTable = Tk_CreateOptionTable(interp, optionSpecs); msgPtr = (Message *) ckalloc(sizeof(Message)); memset(msgPtr, 0, (size_t) sizeof(Message)); /* * Set values for those fields that don't take a 0 or NULL value. */ msgPtr->tkwin = tkwin; msgPtr->display = Tk_Display(tkwin); msgPtr->interp = interp; msgPtr->widgetCmd = Tcl_CreateObjCommand(interp, Tk_PathName(msgPtr->tkwin), MessageWidgetObjCmd, (ClientData) msgPtr, MessageCmdDeletedProc); msgPtr->optionTable = optionTable; msgPtr->relief = TK_RELIEF_FLAT; msgPtr->textGC = None; msgPtr->anchor = TK_ANCHOR_CENTER; msgPtr->aspect = 150; msgPtr->justify = TK_JUSTIFY_LEFT; msgPtr->cursor = None; Tk_SetClass(msgPtr->tkwin, "Message"); Tk_SetClassProcs(msgPtr->tkwin, &messageClass, (ClientData) msgPtr); Tk_CreateEventHandler(msgPtr->tkwin, ExposureMask|StructureNotifyMask|FocusChangeMask, MessageEventProc, (ClientData) msgPtr); if (Tk_InitOptions(interp, (char *)msgPtr, optionTable, tkwin) != TCL_OK) { Tk_DestroyWindow(msgPtr->tkwin); return TCL_ERROR; } if (ConfigureMessage(interp, msgPtr, objc-2, objv+2, 0) != TCL_OK) { Tk_DestroyWindow(msgPtr->tkwin); return TCL_ERROR; } Tcl_SetResult(interp, Tk_PathName(msgPtr->tkwin), TCL_STATIC); return TCL_OK; } /* *-------------------------------------------------------------- * * MessageWidgetObjCmd -- * * 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 MessageWidgetObjCmd(clientData, interp, objc, objv) ClientData clientData; /* Information about message widget. */ Tcl_Interp *interp; /* Current interpreter. */ int objc; /* Number of arguments. */ Tcl_Obj *CONST objv[]; /* Argument strings. */ { register Message *msgPtr = (Message *) clientData; static CONST char *optionStrings[] = { "cget", "configure", (char *) NULL }; enum options { MESSAGE_CGET, MESSAGE_CONFIGURE }; int index; int result = TCL_OK; Tcl_Obj *objPtr; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], optionStrings, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } Tcl_Preserve((ClientData) msgPtr); switch ((enum options) index) { case MESSAGE_CGET: { if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "option"); result = TCL_ERROR; } else { objPtr = Tk_GetOptionValue(interp, (char *) msgPtr, msgPtr->optionTable, objv[2], msgPtr->tkwin); if (objPtr == NULL) { result = TCL_ERROR; } else { Tcl_SetObjResult(interp, objPtr); result = TCL_OK; } } break; } case MESSAGE_CONFIGURE: { if (objc <= 3) { objPtr = Tk_GetOptionInfo(interp, (char *) msgPtr, msgPtr->optionTable, (objc == 3) ? objv[2] : (Tcl_Obj *) NULL, msgPtr->tkwin); if (objPtr == NULL) { result = TCL_ERROR; } else { Tcl_SetObjResult(interp, objPtr); result = TCL_OK; } } else { result = ConfigureMessage(interp, msgPtr, objc-2, objv+2, 0); } break; } } Tcl_Release((ClientData) msgPtr); return result; } /* *---------------------------------------------------------------------- * * DestroyMessage -- * * This procedure is invoked by Tcl_EventuallyFree or Tcl_Release * to clean up the internal structure of a message at a safe time * (when no-one is using it anymore). * * Results: * None. * * Side effects: * Everything associated with the message is freed up. * *---------------------------------------------------------------------- */ static void DestroyMessage(memPtr) char *memPtr; /* Info about message widget. */ { register Message *msgPtr = (Message *) memPtr; msgPtr->flags |= MESSAGE_DELETED; Tcl_DeleteCommandFromToken(msgPtr->interp, msgPtr->widgetCmd); if (msgPtr->flags & REDRAW_PENDING) { Tcl_CancelIdleCall(DisplayMessage, (ClientData) msgPtr); } /* * Free up all the stuff that requires special handling, then * let Tk_FreeConfigOptions handle all the standard option-related * stuff. */ if (msgPtr->textGC != None) { Tk_FreeGC(msgPtr->display, msgPtr->textGC); } if (msgPtr->textLayout != NULL) { Tk_FreeTextLayout(msgPtr->textLayout); } if (msgPtr->textVarName != NULL) { Tcl_UntraceVar(msgPtr->interp, msgPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, MessageTextVarProc, (ClientData) msgPtr); } Tk_FreeConfigOptions((char *) msgPtr, msgPtr->optionTable, msgPtr->tkwin); msgPtr->tkwin = NULL; ckfree((char *) msgPtr); } /* *---------------------------------------------------------------------- * * ConfigureMessage -- * * This procedure is called to process an argv/argc list, plus * the Tk option database, in order to configure (or * reconfigure) a message 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 text string, colors, font, * etc. get set for msgPtr; old resources get freed, if there * were any. * *---------------------------------------------------------------------- */ static int ConfigureMessage(interp, msgPtr, objc, objv, flags) Tcl_Interp *interp; /* Used for error reporting. */ register Message *msgPtr; /* 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[]; /* Arguments. */ int flags; /* Flags to pass to Tk_ConfigureWidget. */ { Tk_SavedOptions savedOptions; /* * Eliminate any existing trace on a variable monitored by the message. */ if (msgPtr->textVarName != NULL) { Tcl_UntraceVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, MessageTextVarProc, (ClientData) msgPtr); } if (Tk_SetOptions(interp, (char *) msgPtr, msgPtr->optionTable, objc, objv, msgPtr->tkwin, &savedOptions, (int *)NULL) != TCL_OK) { Tk_RestoreSavedOptions(&savedOptions); return TCL_ERROR; } /* * If the message is to display the value of a variable, then set up * a trace on the variable's value, create the variable if it doesn't * exist, and fetch its current value. */ if (msgPtr->textVarName != NULL) { CONST char *value; value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY); if (value == NULL) { Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string, TCL_GLOBAL_ONLY); } else { if (msgPtr->string != NULL) { ckfree(msgPtr->string); } msgPtr->string = strcpy(ckalloc(strlen(value) + 1), value); } Tcl_TraceVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, MessageTextVarProc, (ClientData) msgPtr); } /* * A few other options need special processing, such as setting * the background from a 3-D border or handling special defaults * that couldn't be specified to Tk_ConfigureWidget. */ msgPtr->numChars = Tcl_NumUtfChars(msgPtr->string, -1); if (msgPtr->highlightWidth < 0) { msgPtr->highlightWidth = 0; } Tk_FreeSavedOptions(&savedOptions); MessageWorldChanged((ClientData) msgPtr); return TCL_OK; } /* *--------------------------------------------------------------------------- * * MessageWorldChanged -- * * 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: * Message will be relayed out and redisplayed. * *--------------------------------------------------------------------------- */ static void MessageWorldChanged(instanceData) ClientData instanceData; /* Information about widget. */ { XGCValues gcValues; GC gc = None; Tk_FontMetrics fm; Message *msgPtr; msgPtr = (Message *) instanceData; if (msgPtr->border != NULL) { Tk_SetBackgroundFromBorder(msgPtr->tkwin, msgPtr->border); } gcValues.font = Tk_FontId(msgPtr->tkfont); gcValues.foreground = msgPtr->fgColorPtr->pixel; gc = Tk_GetGC(msgPtr->tkwin, GCForeground | GCFont, &gcValues); if (msgPtr->textGC != None) { Tk_FreeGC(msgPtr->display, msgPtr->textGC); } msgPtr->textGC = gc; Tk_GetFontMetrics(msgPtr->tkfont, &fm); if (msgPtr->padX < 0) { msgPtr->padX = fm.ascent / 2; } if (msgPtr->padY == -1) { msgPtr->padY = fm.ascent / 4; } /* * Recompute the desired geometry for the window, and arrange for * the window to be redisplayed. */ ComputeMessageGeometry(msgPtr); if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin) && !(msgPtr->flags & REDRAW_PENDING)) { Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr); msgPtr->flags |= REDRAW_PENDING; } } /* *-------------------------------------------------------------- * * ComputeMessageGeometry -- * * Compute the desired geometry for a message window, * taking into account the desired aspect ratio for the * window. * * Results: * None. * * Side effects: * Tk_GeometryRequest is called to inform the geometry * manager of the desired geometry for this window. * *-------------------------------------------------------------- */ static void ComputeMessageGeometry(msgPtr) register Message *msgPtr; /* Information about window. */ { int width, inc, height; int thisWidth, thisHeight, maxWidth; int aspect, lowerBound, upperBound, inset; Tk_FreeTextLayout(msgPtr->textLayout); inset = msgPtr->borderWidth + msgPtr->highlightWidth; /* * Compute acceptable bounds for the final aspect ratio. */ aspect = msgPtr->aspect/10; if (aspect < 5) { aspect = 5; } lowerBound = msgPtr->aspect - aspect; upperBound = msgPtr->aspect + aspect; /* * Do the computation in multiple passes: start off with * a very wide window, and compute its height. Then change * the width and try again. Reduce the size of the change * and iterate until dimensions are found that approximate * the desired aspect ratio. Or, if the user gave an explicit * width then just use that. */ if (msgPtr->width > 0) { width = msgPtr->width; inc = 0; } else { width = WidthOfScreen(Tk_Screen(msgPtr->tkwin))/2; inc = width/2; } for ( ; ; inc /= 2) { msgPtr->textLayout = Tk_ComputeTextLayout(msgPtr->tkfont, msgPtr->string, msgPtr->numChars, width, msgPtr->justify, 0, &thisWidth, &thisHeight); maxWidth = thisWidth + 2 * (inset + msgPtr->padX); height = thisHeight + 2 * (inset + msgPtr->padY); if (inc <= 2) { break; } aspect = (100 * maxWidth) / height; if (aspect < lowerBound) { width += inc; } else if (aspect > upperBound) { width -= inc; } else { break; } Tk_FreeTextLayout(msgPtr->textLayout); } msgPtr->msgWidth = thisWidth; msgPtr->msgHeight = thisHeight; Tk_GeometryRequest(msgPtr->tkwin, maxWidth, height); Tk_SetInternalBorder(msgPtr->tkwin, inset); } /* *-------------------------------------------------------------- * * DisplayMessage -- * * This procedure redraws the contents of a message window. * * Results: * None. * * Side effects: * Information appears on the screen. * *-------------------------------------------------------------- */ static void DisplayMessage(clientData) ClientData clientData; /* Information about window. */ { register Message *msgPtr = (Message *) clientData; register Tk_Window tkwin = msgPtr->tkwin; int x, y; int borderWidth = msgPtr->highlightWidth; msgPtr->flags &= ~REDRAW_PENDING; if ((msgPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) { return; } if (msgPtr->border != NULL) { borderWidth += msgPtr->borderWidth; } if (msgPtr->relief == TK_RELIEF_FLAT) { borderWidth = msgPtr->highlightWidth; } Tk_Fill3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border, borderWidth, borderWidth, Tk_Width(tkwin) - 2 * borderWidth, Tk_Height(tkwin) - 2 * borderWidth, 0, TK_RELIEF_FLAT); /* * Compute starting y-location for message based on message size * and anchor option. */ TkComputeAnchor(msgPtr->anchor, tkwin, msgPtr->padX, msgPtr->padY, msgPtr->msgWidth, msgPtr->msgHeight, &x, &y); Tk_DrawTextLayout(Tk_Display(tkwin), Tk_WindowId(tkwin), msgPtr->textGC, msgPtr->textLayout, x, y, 0, -1); if (borderWidth > msgPtr->highlightWidth) { Tk_Draw3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border, msgPtr->highlightWidth, msgPtr->highlightWidth, Tk_Width(tkwin) - 2*msgPtr->highlightWidth, Tk_Height(tkwin) - 2*msgPtr->highlightWidth, msgPtr->borderWidth, msgPtr->relief); } if (msgPtr->highlightWidth != 0) { GC fgGC, bgGC; bgGC = Tk_GCForColor(msgPtr->highlightBgColorPtr, Tk_WindowId(tkwin)); if (msgPtr->flags & GOT_FOCUS) { fgGC = Tk_GCForColor(msgPtr->highlightColorPtr, Tk_WindowId(tkwin)); TkpDrawHighlightBorder(tkwin, fgGC, bgGC, msgPtr->highlightWidth, Tk_WindowId(tkwin)); } else { TkpDrawHighlightBorder(tkwin, bgGC, bgGC, msgPtr->highlightWidth, Tk_WindowId(tkwin)); } } } /* *-------------------------------------------------------------- * * MessageEventProc -- * * This procedure is invoked by the Tk dispatcher for various * events on messages. * * Results: * None. * * Side effects: * When the window gets deleted, internal structures get * cleaned up. When it gets exposed, it is redisplayed. * *-------------------------------------------------------------- */ static void MessageEventProc(clientData, eventPtr) ClientData clientData; /* Information about window. */ XEvent *eventPtr; /* Information about event. */ { Message *msgPtr = (Message *) clientData; if (((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0)) || (eventPtr->type == ConfigureNotify)) { goto redraw; } else if (eventPtr->type == DestroyNotify) { DestroyMessage((char *) clientData); } else if (eventPtr->type == FocusIn) { if (eventPtr->xfocus.detail != NotifyInferior) { msgPtr->flags |= GOT_FOCUS; if (msgPtr->highlightWidth > 0) { goto redraw; } } } else if (eventPtr->type == FocusOut) { if (eventPtr->xfocus.detail != NotifyInferior) { msgPtr->flags &= ~GOT_FOCUS; if (msgPtr->highlightWidth > 0) { goto redraw; } } } return; redraw: if ((msgPtr->tkwin != NULL) && !(msgPtr->flags & REDRAW_PENDING)) { Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr); msgPtr->flags |= REDRAW_PENDING; } } /* *---------------------------------------------------------------------- * * MessageCmdDeletedProc -- * * 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 MessageCmdDeletedProc(clientData) ClientData clientData; /* Pointer to widget record for widget. */ { Message *msgPtr = (Message *) 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 (!(msgPtr->flags & MESSAGE_DELETED)) { Tk_DestroyWindow(msgPtr->tkwin); } } /* *-------------------------------------------------------------- * * MessageTextVarProc -- * * This procedure is invoked when someone changes the variable * whose contents are to be displayed in a message. * * Results: * NULL is always returned. * * Side effects: * The text displayed in the message will change to match the * variable. * *-------------------------------------------------------------- */ /* ARGSUSED */ static char * MessageTextVarProc(clientData, interp, name1, name2, flags) ClientData clientData; /* Information about message. */ Tcl_Interp *interp; /* Interpreter containing variable. */ CONST char *name1; /* Name of variable. */ CONST char *name2; /* Second part of variable name. */ int flags; /* Information about what happened. */ { register Message *msgPtr = (Message *) clientData; CONST 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, msgPtr->textVarName, msgPtr->string, TCL_GLOBAL_ONLY); Tcl_TraceVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, MessageTextVarProc, clientData); } return (char *) NULL; } value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY); if (value == NULL) { value = ""; } if (msgPtr->string != NULL) { ckfree(msgPtr->string); } msgPtr->numChars = Tcl_NumUtfChars(value, -1); msgPtr->string = (char *) ckalloc((unsigned) (strlen(value) + 1)); strcpy(msgPtr->string, value); ComputeMessageGeometry(msgPtr); if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin) && !(msgPtr->flags & REDRAW_PENDING)) { Tcl_DoWhenIdle(DisplayMessage, (ClientData) msgPtr); msgPtr->flags |= REDRAW_PENDING; } return (char *) NULL; }