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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) 1994-1997 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.
*/
#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 const 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,
DEF_MESSAGE_BG_MONO, 0},
{TK_OPTION_SYNONYM, "-bd", NULL, NULL, NULL,
0, -1, 0, "-borderwidth", 0},
{TK_OPTION_SYNONYM, "-bg", NULL, NULL, NULL,
0, -1, 0, "-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", NULL, NULL, NULL,
0, -1, 0, "-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, 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, NULL, NULL, NULL, NULL, 0, 0, 0, 0, 0}
};
/*
* Forward declarations for functions defined later in this file:
*/
static void MessageCmdDeletedProc(ClientData clientData);
static void MessageEventProc(ClientData clientData,
XEvent *eventPtr);
static char * MessageTextVarProc(ClientData clientData,
Tcl_Interp *interp, const char *name1,
const char *name2, int flags);
static int MessageWidgetObjCmd(ClientData clientData,
Tcl_Interp *interp, int objc,
Tcl_Obj *const objv[]);
static void MessageWorldChanged(ClientData instanceData);
static void ComputeMessageGeometry(Message *msgPtr);
static int ConfigureMessage(Tcl_Interp *interp, Message *msgPtr,
int objc, Tcl_Obj *const objv[], int flags);
static void DestroyMessage(char *memPtr);
static void DisplayMessage(ClientData clientData);
/*
* The structure below defines message class behavior by means of functions
* that can be invoked from generic window code.
*/
static const Tk_ClassProcs messageClass = {
sizeof(Tk_ClassProcs), /* size */
MessageWorldChanged, /* worldChangedProc */
NULL, /* createProc */
NULL /* modalProc */
};
/*
*--------------------------------------------------------------
*
* Tk_MessageObjCmd --
*
* This function 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 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 ?-option value ...?");
return TCL_ERROR;
}
tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
Tcl_GetString(objv[1]), 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 = 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, 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, msgPtr);
Tk_CreateEventHandler(msgPtr->tkwin,
ExposureMask|StructureNotifyMask|FocusChangeMask,
MessageEventProc, 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_SetObjResult(interp, TkNewWindowObj(msgPtr->tkwin));
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* MessageWidgetObjCmd --
*
* This function 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 clientData, /* Information about message widget. */
Tcl_Interp *interp, /* Current interpreter. */
int objc, /* Number of arguments. */
Tcl_Obj *const objv[]) /* Argument strings. */
{
register Message *msgPtr = clientData;
static const char *const optionStrings[] = { "cget", "configure", 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 ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObjStruct(interp, objv[1], optionStrings,
sizeof(char *), "option", 0, &index) != TCL_OK) {
return TCL_ERROR;
}
Tcl_Preserve(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] : 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(msgPtr);
return result;
}
/*
*----------------------------------------------------------------------
*
* DestroyMessage --
*
* This function 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(
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, 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_UntraceVar2(msgPtr->interp, msgPtr->textVarName, NULL,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
MessageTextVarProc, msgPtr);
}
Tk_FreeConfigOptions((char *) msgPtr, msgPtr->optionTable, msgPtr->tkwin);
msgPtr->tkwin = NULL;
ckfree(msgPtr);
}
/*
*----------------------------------------------------------------------
*
* ConfigureMessage --
*
* This function 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(
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_UntraceVar2(interp, msgPtr->textVarName, NULL,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
MessageTextVarProc, msgPtr);
}
if (Tk_SetOptions(interp, (char *) msgPtr, msgPtr->optionTable, objc, objv,
msgPtr->tkwin, &savedOptions, 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_GetVar2(interp, msgPtr->textVarName, NULL, TCL_GLOBAL_ONLY);
if (value == NULL) {
Tcl_SetVar2(interp, msgPtr->textVarName, NULL, msgPtr->string,
TCL_GLOBAL_ONLY);
} else {
if (msgPtr->string != NULL) {
ckfree(msgPtr->string);
}
msgPtr->string = strcpy(ckalloc(strlen(value) + 1), value);
}
Tcl_TraceVar2(interp, msgPtr->textVarName, NULL,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
MessageTextVarProc, 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(msgPtr);
return TCL_OK;
}
/*
*---------------------------------------------------------------------------
*
* MessageWorldChanged --
*
* This function 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(
ClientData instanceData) /* Information about widget. */
{
XGCValues gcValues;
GC gc = None;
Tk_FontMetrics fm;
Message *msgPtr = 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, 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(
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 function redraws the contents of a message window.
*
* Results:
* None.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
DisplayMessage(
ClientData clientData) /* Information about window. */
{
register Message *msgPtr = 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 function 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 clientData, /* Information about window. */
XEvent *eventPtr) /* Information about event. */
{
Message *msgPtr = clientData;
if (((eventPtr->type == Expose) && (eventPtr->xexpose.count == 0))
|| (eventPtr->type == ConfigureNotify)) {
goto redraw;
} else if (eventPtr->type == DestroyNotify) {
DestroyMessage(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, msgPtr);
msgPtr->flags |= REDRAW_PENDING;
}
}
/*
*----------------------------------------------------------------------
*
* MessageCmdDeletedProc --
*
* This function 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) /* Pointer to widget record for widget. */
{
Message *msgPtr = clientData;
/*
* This function 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 function destroys the
* widget.
*/
if (!(msgPtr->flags & MESSAGE_DELETED)) {
Tk_DestroyWindow(msgPtr->tkwin);
}
}
/*
*--------------------------------------------------------------
*
* MessageTextVarProc --
*
* This function 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 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 = 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_SetVar2(interp, msgPtr->textVarName, NULL, msgPtr->string,
TCL_GLOBAL_ONLY);
Tcl_TraceVar2(interp, msgPtr->textVarName, NULL,
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
MessageTextVarProc, clientData);
}
return NULL;
}
value = Tcl_GetVar2(interp, msgPtr->textVarName, NULL, TCL_GLOBAL_ONLY);
if (value == NULL) {
value = "";
}
if (msgPtr->string != NULL) {
ckfree(msgPtr->string);
}
msgPtr->numChars = Tcl_NumUtfChars(value, -1);
msgPtr->string = ckalloc(strlen(value) + 1);
strcpy(msgPtr->string, value);
ComputeMessageGeometry(msgPtr);
if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin)
&& !(msgPtr->flags & REDRAW_PENDING)) {
Tcl_DoWhenIdle(DisplayMessage, msgPtr);
msgPtr->flags |= REDRAW_PENDING;
}
return NULL;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/