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Diffstat (limited to 'tk8.6/generic/tkMessage.c')
| -rw-r--r-- | tk8.6/generic/tkMessage.c | 903 |
1 files changed, 903 insertions, 0 deletions
diff --git a/tk8.6/generic/tkMessage.c b/tk8.6/generic/tkMessage.c new file mode 100644 index 0000000..1a3c6de --- /dev/null +++ b/tk8.6/generic/tkMessage.c @@ -0,0 +1,903 @@ +/* + * 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 = NULL; + msgPtr->anchor = TK_ANCHOR_CENTER; + msgPtr->aspect = 150; + msgPtr->justify = TK_JUSTIFY_LEFT; + msgPtr->cursor = NULL; + + 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 != NULL) { + 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 = NULL; + 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 != NULL) { + 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 (!Tcl_InterpDeleted(interp) && msgPtr->textVarName) { + ClientData probe = NULL; + + do { + probe = Tcl_VarTraceInfo(interp, + msgPtr->textVarName, + TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS, + MessageTextVarProc, probe); + if (probe == (ClientData)msgPtr) { + break; + } + } while (probe); + if (probe) { + /* + * We were able to fetch the unset trace for our + * textVarName, which means it is not unset and not + * the cause of this unset trace. Instead some outdated + * former variable must be, and we should ignore it. + */ + return NULL; + } + 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: + */ |