stk/Tk/generic/tkMessage.c

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/*
* 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) 1994-1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkMessage.c 1.75 97/07/31 09:11:14
*/
#include "tkPort.h"
#include "default.h"
#include "tkInt.h"
#ifdef BGLK_CODE
# define STk_tcl_getvar SCM_tcl_getvar
# define STk_tcl_setvar SCM_tcl_setvar
#endif
/*
* 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.*/
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 character. */
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. */
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. */
#ifdef SCM_CODE
char *env; /* -variable and -textvariable environment */
#endif
} 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.
*/
#define REDRAW_PENDING 1
#define GOT_FOCUS 4
/*
* Information used for argv parsing.
*/
static Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_ANCHOR, "-anchor", "anchor", "Anchor",
DEF_MESSAGE_ANCHOR, Tk_Offset(Message, anchor), 0},
{TK_CONFIG_INT, "-aspect", "aspect", "Aspect",
DEF_MESSAGE_ASPECT, Tk_Offset(Message, aspect), 0},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_MESSAGE_BG_COLOR, Tk_Offset(Message, border),
TK_CONFIG_COLOR_ONLY},
{TK_CONFIG_BORDER, "-background", "background", "Background",
DEF_MESSAGE_BG_MONO, Tk_Offset(Message, border),
TK_CONFIG_MONO_ONLY},
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
DEF_MESSAGE_BORDER_WIDTH, Tk_Offset(Message, borderWidth), 0},
{TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
DEF_MESSAGE_CURSOR, Tk_Offset(Message, cursor), TK_CONFIG_NULL_OK},
#ifdef STk_CODE
{TK_CONFIG_ENV, "-environment", "environment", "Environment",
DEF_MESSAGE_ENV, Tk_Offset(Message, env), 0},
#endif
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
(char *) NULL, 0, 0},
{TK_CONFIG_FONT, "-font", "font", "Font",
DEF_MESSAGE_FONT, Tk_Offset(Message, tkfont), 0},
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
DEF_MESSAGE_FG, Tk_Offset(Message, fgColorPtr), 0},
{TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
"HighlightBackground", DEF_MESSAGE_HIGHLIGHT_BG,
Tk_Offset(Message, highlightBgColorPtr), 0},
{TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
DEF_MESSAGE_HIGHLIGHT, Tk_Offset(Message, highlightColorPtr), 0},
{TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
"HighlightThickness",
DEF_MESSAGE_HIGHLIGHT_WIDTH, Tk_Offset(Message, highlightWidth), 0},
{TK_CONFIG_JUSTIFY, "-justify", "justify", "Justify",
DEF_MESSAGE_JUSTIFY, Tk_Offset(Message, justify), 0},
{TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
DEF_MESSAGE_PADX, Tk_Offset(Message, padX), 0},
{TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
DEF_MESSAGE_PADY, Tk_Offset(Message, padY), 0},
{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
DEF_MESSAGE_RELIEF, Tk_Offset(Message, relief), 0},
#ifdef SCM_CODE
{TK_CONFIG_CLOSURE, "-takefocus", "takeFocus", "TakeFocus",
#else
{TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
#endif
DEF_MESSAGE_TAKE_FOCUS, Tk_Offset(Message, takeFocus),
TK_CONFIG_NULL_OK},
{TK_CONFIG_STRING, "-text", "text", "Text",
DEF_MESSAGE_TEXT, Tk_Offset(Message, string), 0},
{TK_CONFIG_STRING, "-textvariable", "textVariable", "Variable",
DEF_MESSAGE_TEXT_VARIABLE, Tk_Offset(Message, textVarName),
TK_CONFIG_NULL_OK},
{TK_CONFIG_PIXELS, "-width", "width", "Width",
DEF_MESSAGE_WIDTH, Tk_Offset(Message, width), 0},
{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
(char *) NULL, 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, char *name1, char *name2,
int flags));
static int MessageWidgetCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int argc, char **argv));
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 argc, char **argv,
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 TkClassProcs messageClass = {
NULL, /* createProc. */
MessageWorldChanged, /* geometryProc. */
NULL /* modalProc. */
};
/*
*--------------------------------------------------------------
*
* Tk_MessageCmd --
*
* 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_MessageCmd(clientData, interp, argc, argv)
ClientData clientData; /* Main window associated with
* interpreter. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Message *msgPtr;
Tk_Window new;
Tk_Window tkwin = (Tk_Window) clientData;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " pathName ?options?\"", (char *) NULL);
return TCL_ERROR;
}
new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
if (new == NULL) {
return TCL_ERROR;
}
msgPtr = (Message *) ckalloc(sizeof(Message));
msgPtr->tkwin = new;
msgPtr->display = Tk_Display(new);
msgPtr->interp = interp;
msgPtr->widgetCmd = Tcl_CreateCommand(interp, Tk_PathName(msgPtr->tkwin),
MessageWidgetCmd, (ClientData) msgPtr, MessageCmdDeletedProc);
msgPtr->textLayout = NULL;
msgPtr->string = NULL;
msgPtr->numChars = 0;
msgPtr->textVarName = NULL;
msgPtr->border = NULL;
msgPtr->borderWidth = 0;
msgPtr->relief = TK_RELIEF_FLAT;
msgPtr->highlightWidth = 0;
msgPtr->highlightBgColorPtr = NULL;
msgPtr->highlightColorPtr = NULL;
msgPtr->tkfont = NULL;
msgPtr->fgColorPtr = NULL;
msgPtr->textGC = None;
msgPtr->padX = 0;
msgPtr->padY = 0;
msgPtr->anchor = TK_ANCHOR_CENTER;
msgPtr->width = 0;
msgPtr->aspect = 150;
msgPtr->msgWidth = 0;
msgPtr->msgHeight = 0;
msgPtr->justify = TK_JUSTIFY_LEFT;
msgPtr->cursor = None;
msgPtr->takeFocus = NULL;
msgPtr->flags = 0;
#ifdef SCM_CODE
msgPtr->env = NULL;
#endif
Tk_SetClass(msgPtr->tkwin, "Message");
TkSetClassProcs(msgPtr->tkwin, &messageClass, (ClientData) msgPtr);
Tk_CreateEventHandler(msgPtr->tkwin,
ExposureMask|StructureNotifyMask|FocusChangeMask,
MessageEventProc, (ClientData) msgPtr);
if (ConfigureMessage(interp, msgPtr, argc-2, argv+2, 0) != TCL_OK) {
goto error;
}
#ifdef STk_CODE
STk_sharp_dot_result(interp, Tk_PathName(msgPtr->tkwin));
#else
interp->result = Tk_PathName(msgPtr->tkwin);
#endif
return TCL_OK;
error:
Tk_DestroyWindow(msgPtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* MessageWidgetCmd --
*
* 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
MessageWidgetCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about message widget. */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
register Message *msgPtr = (Message *) clientData;
size_t length;
int c;
if (argc < 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" option ?arg arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
c = argv[1][0];
length = strlen(argv[1]);
if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
&& (length >= 2)) {
if (argc != 3) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " cget option\"",
(char *) NULL);
return TCL_ERROR;
}
return Tk_ConfigureValue(interp, msgPtr->tkwin, configSpecs,
(char *) msgPtr, argv[2], 0);
} else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
&& (length >= 2)) {
if (argc == 2) {
return Tk_ConfigureInfo(interp, msgPtr->tkwin, configSpecs,
(char *) msgPtr, (char *) NULL, 0);
} else if (argc == 3) {
return Tk_ConfigureInfo(interp, msgPtr->tkwin, configSpecs,
(char *) msgPtr, argv[2], 0);
} else {
return ConfigureMessage(interp, msgPtr, argc-2, argv+2,
TK_CONFIG_ARGV_ONLY);
}
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be cget or configure", (char *) NULL);
return TCL_ERROR;
}
}
/*
*----------------------------------------------------------------------
*
* 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;
/*
* Free up all the stuff that requires special handling, then
* let Tk_FreeOptions handle all the standard option-related
* stuff.
*/
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);
}
if (msgPtr->textGC != None) {
Tk_FreeGC(msgPtr->display, msgPtr->textGC);
}
Tk_FreeOptions(configSpecs, (char *) msgPtr, msgPtr->display, 0);
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 interp->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, argc, argv, 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 argc; /* Number of valid entries in argv. */
char **argv; /* Arguments. */
int flags; /* Flags to pass to Tk_ConfigureWidget. */
{
/*
* 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_ConfigureWidget(interp, msgPtr->tkwin, configSpecs,
argc, argv, (char *) msgPtr, flags) != TCL_OK) {
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) {
char *value;
#ifdef SCM_CODE
value = STk_tcl_getvar(msgPtr->textVarName, msgPtr->env);
#else
value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY);
#endif
if (value == NULL) {
#ifdef SCM_CODE
STk_tcl_setvar(msgPtr->textVarName, msgPtr->string, 0, msgPtr->env);
#else
Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string,
TCL_GLOBAL_ONLY);
#endif
} 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 = strlen(msgPtr->string);
Tk_SetBackgroundFromBorder(msgPtr->tkwin, msgPtr->border);
if (msgPtr->highlightWidth < 0) {
msgPtr->highlightWidth = 0;
}
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;
Tk_FontMetrics fm;
Message *msgPtr;
msgPtr = (Message *) instanceData;
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;
msgPtr->flags &= ~REDRAW_PENDING;
if ((msgPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
return;
}
Tk_Fill3DRectangle(tkwin, Tk_WindowId(tkwin), msgPtr->border, 0, 0,
Tk_Width(tkwin), Tk_Height(tkwin), 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 (msgPtr->relief != TK_RELIEF_FLAT) {
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 gc;
if (msgPtr->flags & GOT_FOCUS) {
gc = Tk_GCForColor(msgPtr->highlightColorPtr, Tk_WindowId(tkwin));
} else {
gc = Tk_GCForColor(msgPtr->highlightBgColorPtr, Tk_WindowId(tkwin));
}
Tk_DrawFocusHighlight(tkwin, gc, 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) {
if (msgPtr->tkwin != NULL) {
msgPtr->tkwin = NULL;
Tcl_DeleteCommandFromToken(msgPtr->interp, msgPtr->widgetCmd);
}
if (msgPtr->flags & REDRAW_PENDING) {
Tcl_CancelIdleCall(DisplayMessage, (ClientData) msgPtr);
}
Tcl_EventuallyFree((ClientData) msgPtr, DestroyMessage);
} 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;
Tk_Window tkwin = msgPtr->tkwin;
/*
* 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 (tkwin != NULL) {
msgPtr->tkwin = NULL;
Tk_DestroyWindow(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. */
char *name1; /* Name of variable. */
char *name2; /* Second part of variable name. */
int flags; /* Information about what happened. */
{
register Message *msgPtr = (Message *) 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)) {
#ifdef SCM_CODE
STk_tcl_setvar(msgPtr->textVarName, msgPtr->string, 0, msgPtr->env);
#else
Tcl_SetVar(interp, msgPtr->textVarName, msgPtr->string,
TCL_GLOBAL_ONLY);
#endif
Tcl_TraceVar(interp, msgPtr->textVarName,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
MessageTextVarProc, clientData);
}
return (char *) NULL;
}
#ifdef SCM_CODE
value = STk_tcl_getvar(msgPtr->textVarName, msgPtr->env);
#else
value = Tcl_GetVar(interp, msgPtr->textVarName, TCL_GLOBAL_ONLY);
#endif
if (value == NULL) {
value = "";
}
if (msgPtr->string != NULL) {
ckfree(msgPtr->string);
}
msgPtr->numChars = strlen(value);
msgPtr->string = (char *) ckalloc((unsigned) (msgPtr->numChars + 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;
}