799 lines
24 KiB
C
799 lines
24 KiB
C
/*
|
||
* 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) 1990-1993 The Regents of the University of California.
|
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* All rights reserved.
|
||
*
|
||
* Permission is hereby granted, without written agreement and without
|
||
* license or royalty fees, to use, copy, modify, and distribute this
|
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* software and its documentation for any purpose, provided that the
|
||
* above copyright notice and the following two paragraphs appear in
|
||
* all copies of this software.
|
||
*
|
||
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
|
||
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
|
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
|
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
*
|
||
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
|
||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
||
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
|
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
||
*/
|
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|
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#ifndef lint
|
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static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkMessage.c,v 1.41 93/08/18 16:25:32 ouster Exp $ SPRITE (Berkeley)";
|
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#endif
|
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|
||
#include "tkConfig.h"
|
||
#include "default.h"
|
||
#include "tkInt.h"
|
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|
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/*
|
||
* 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
|
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* 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. */
|
||
Tk_Uid 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.
|
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* If non-NULL, message displays the contents
|
||
* of this variable. */
|
||
|
||
/*
|
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* Information used when displaying widget:
|
||
*/
|
||
|
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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. */
|
||
XFontStruct *fontPtr; /* Information about text font, or NULL. */
|
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XColor *fgColorPtr; /* Foreground color in normal mode. */
|
||
GC textGC; /* GC for drawing text in normal mode. */
|
||
int padX, padY; /* User-requested extra space around text. */
|
||
Tk_Anchor anchor; /* Where to position text within window region
|
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* if window is larger or smaller than
|
||
* needed. */
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||
int width; /* User-requested width, in pixels. 0 means
|
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* compute width using aspect ratio below. */
|
||
int aspect; /* Desired aspect ratio for window
|
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* (100*width/height). */
|
||
int lineLength; /* Length of each line, in pixels. Computed
|
||
* from width and/or aspect. */
|
||
int msgHeight; /* Total number of pixels in vertical direction
|
||
* needed to display message. */
|
||
Tk_Justify justify; /* Justification for text. */
|
||
|
||
/*
|
||
* Miscellaneous information:
|
||
*/
|
||
|
||
Cursor cursor; /* Current cursor for window, or None. */
|
||
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.
|
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* CLEAR_NEEDED; Need to clear the window when redrawing.
|
||
*/
|
||
|
||
#define REDRAW_PENDING 1
|
||
#define CLEAR_NEEDED 2
|
||
|
||
/*
|
||
* Information used for argv parsing.
|
||
*/
|
||
|
||
|
||
static Tk_ConfigSpec configSpecs[] = {
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{TK_CONFIG_ANCHOR, "-anchor", "anchor", "Anchor",
|
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DEF_MESSAGE_ANCHOR, Tk_Offset(Message, anchor), 0},
|
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{TK_CONFIG_INT, "-aspect", "aspect", "Aspect",
|
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DEF_MESSAGE_ASPECT, Tk_Offset(Message, aspect), 0},
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||
{TK_CONFIG_BORDER, "-background", "background", "Background",
|
||
DEF_MESSAGE_BG_COLOR, Tk_Offset(Message, border),
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TK_CONFIG_COLOR_ONLY},
|
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{TK_CONFIG_BORDER, "-background", "background", "Background",
|
||
DEF_MESSAGE_BG_MONO, Tk_Offset(Message, border),
|
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TK_CONFIG_MONO_ONLY},
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||
{TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
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(char *) NULL, 0, 0},
|
||
{TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
|
||
(char *) NULL, 0, 0},
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||
{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},
|
||
{TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
|
||
(char *) NULL, 0, 0},
|
||
{TK_CONFIG_FONT, "-font", "font", "Font",
|
||
DEF_MESSAGE_FONT, Tk_Offset(Message, fontPtr), 0},
|
||
{TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
|
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DEF_MESSAGE_FG, Tk_Offset(Message, fgColorPtr), 0},
|
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{TK_CONFIG_JUSTIFY, "-justify", "justify", "Justify",
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DEF_MESSAGE_JUSTIFY, Tk_Offset(Message, justify), 0},
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{TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
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DEF_MESSAGE_PADX, Tk_Offset(Message, padX), 0},
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{TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
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DEF_MESSAGE_PADY, Tk_Offset(Message, padY), 0},
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{TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
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DEF_MESSAGE_RELIEF, Tk_Offset(Message, relief), 0},
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{TK_CONFIG_STRING, "-text", "text", "Text",
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DEF_MESSAGE_TEXT, Tk_Offset(Message, string), 0},
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{TK_CONFIG_STRING, "-textvariable", "textVariable", "Variable",
|
||
DEF_MESSAGE_TEXT_VARIABLE, Tk_Offset(Message, textVarName),
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TK_CONFIG_NULL_OK},
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{TK_CONFIG_PIXELS, "-width", "width", "Width",
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DEF_MESSAGE_WIDTH, Tk_Offset(Message, width), 0},
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{TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
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(char *) NULL, 0, 0}
|
||
};
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||
|
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/*
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* Forward declarations for procedures defined later in this file:
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*/
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static void MessageEventProc _ANSI_ARGS_((ClientData clientData,
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XEvent *eventPtr));
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static char * MessageTextVarProc _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp, char *name1, char *name2,
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int flags));
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static int MessageWidgetCmd _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp, int argc, char **argv));
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static void ComputeMessageGeometry _ANSI_ARGS_((Message *msgPtr));
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static int ConfigureMessage _ANSI_ARGS_((Tcl_Interp *interp,
|
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Message *msgPtr, int argc, char **argv,
|
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int flags));
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static void DestroyMessage _ANSI_ARGS_((ClientData clientData));
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static void DisplayMessage _ANSI_ARGS_((ClientData clientData));
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||
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/*
|
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*--------------------------------------------------------------
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*
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* Tk_MessageCmd --
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*
|
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* This procedure is invoked to process the "message" Tcl
|
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* command. See the user documentation for details on what
|
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* it does.
|
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*
|
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* Results:
|
||
* A standard Tcl result.
|
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*
|
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* Side effects:
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||
* See the user documentation.
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*
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*--------------------------------------------------------------
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*/
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int
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||
Tk_MessageCmd(clientData, interp, argc, argv)
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ClientData clientData; /* Main window associated with
|
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* interpreter. */
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Tcl_Interp *interp; /* Current interpreter. */
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int argc; /* Number of arguments. */
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char **argv; /* Argument strings. */
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{
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register Message *msgPtr;
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Tk_Window new;
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Tk_Window tkwin = (Tk_Window) clientData;
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||
|
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if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " pathName ?options?\"", (char *) NULL);
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return TCL_ERROR;
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}
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new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
|
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if (new == NULL) {
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return TCL_ERROR;
|
||
}
|
||
|
||
msgPtr = (Message *) ckalloc(sizeof(Message));
|
||
msgPtr->tkwin = new;
|
||
msgPtr->display = Tk_Display(new);
|
||
msgPtr->interp = interp;
|
||
msgPtr->string = NULL;
|
||
msgPtr->numChars = 0;
|
||
msgPtr->textVarName = NULL;
|
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msgPtr->border = NULL;
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msgPtr->borderWidth = 0;
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msgPtr->relief = TK_RELIEF_FLAT;
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msgPtr->fontPtr = NULL;
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msgPtr->fgColorPtr = NULL;
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||
msgPtr->textGC = None;
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||
msgPtr->padX = 0;
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msgPtr->padY = 0;
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msgPtr->anchor = TK_ANCHOR_CENTER;
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msgPtr->width = 0;
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msgPtr->aspect = 150;
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msgPtr->lineLength = 0;
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msgPtr->msgHeight = 0;
|
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msgPtr->justify = TK_JUSTIFY_LEFT;
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msgPtr->cursor = None;
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msgPtr->flags = 0;
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Tk_SetClass(msgPtr->tkwin, "Message");
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Tk_CreateEventHandler(msgPtr->tkwin, ExposureMask|StructureNotifyMask,
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MessageEventProc, (ClientData) msgPtr);
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Tcl_CreateCommand(interp, Tk_PathName(msgPtr->tkwin), MessageWidgetCmd,
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(ClientData) msgPtr, (void (*)()) NULL);
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if (ConfigureMessage(interp, msgPtr, argc-2, argv+2, 0) != TCL_OK) {
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goto error;
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}
|
||
|
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interp->result = Tk_PathName(msgPtr->tkwin);
|
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return TCL_OK;
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||
|
||
error:
|
||
Tk_DestroyWindow(msgPtr->tkwin);
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return TCL_ERROR;
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}
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/*
|
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*--------------------------------------------------------------
|
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*
|
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* MessageWidgetCmd --
|
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*
|
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* This procedure is invoked to process the Tcl command
|
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* 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.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
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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. */
|
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{
|
||
register Message *msgPtr = (Message *) clientData;
|
||
int length;
|
||
char 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], "configure", length) == 0)) {
|
||
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 configure", (char *) NULL);
|
||
return TCL_ERROR;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* DestroyMessage --
|
||
*
|
||
* This procedure is invoked by Tk_EventuallyFree or Tk_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(clientData)
|
||
ClientData clientData; /* Info about message widget. */
|
||
{
|
||
register Message *msgPtr = (Message *) clientData;
|
||
|
||
/*
|
||
* Free up all the stuff that requires special handling, then
|
||
* let Tk_FreeOptions handle all the standard option-related
|
||
* stuff.
|
||
*/
|
||
|
||
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. */
|
||
{
|
||
XGCValues gcValues;
|
||
GC newGC;
|
||
|
||
/*
|
||
* 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;
|
||
|
||
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 = ckalloc((unsigned) (strlen(value) + 1));
|
||
strcpy(msgPtr->string, 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);
|
||
|
||
gcValues.font = msgPtr->fontPtr->fid;
|
||
gcValues.foreground = msgPtr->fgColorPtr->pixel;
|
||
newGC = Tk_GetGC(msgPtr->tkwin, GCForeground|GCFont,
|
||
&gcValues);
|
||
if (msgPtr->textGC != None) {
|
||
Tk_FreeGC(msgPtr->display, msgPtr->textGC);
|
||
}
|
||
msgPtr->textGC = newGC;
|
||
|
||
if (msgPtr->padX == -1) {
|
||
msgPtr->padX = msgPtr->fontPtr->ascent/2;
|
||
}
|
||
|
||
if (msgPtr->padY == -1) {
|
||
msgPtr->padY = msgPtr->fontPtr->ascent/4;
|
||
}
|
||
|
||
if (msgPtr->justify == TK_JUSTIFY_FILL) {
|
||
interp->result = "can't use \"fill\" justify style in messages";
|
||
return TCL_ERROR;
|
||
}
|
||
|
||
/*
|
||
* 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)) {
|
||
Tk_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
|
||
msgPtr->flags |= REDRAW_PENDING|CLEAR_NEEDED;
|
||
}
|
||
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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. */
|
||
{
|
||
char *p;
|
||
int width, inc, height, numLines;
|
||
int thisWidth, maxWidth;
|
||
int aspect, lowerBound, upperBound;
|
||
|
||
/*
|
||
* 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) {
|
||
maxWidth = 0;
|
||
for (numLines = 1, p = msgPtr->string; ; numLines++) {
|
||
if (*p == '\n') {
|
||
p++;
|
||
continue;
|
||
}
|
||
p += TkMeasureChars(msgPtr->fontPtr, p,
|
||
msgPtr->numChars - (p - msgPtr->string), 0, width,
|
||
TK_WHOLE_WORDS|TK_AT_LEAST_ONE, &thisWidth);
|
||
if (thisWidth > maxWidth) {
|
||
maxWidth = thisWidth;
|
||
}
|
||
if (*p == 0) {
|
||
break;
|
||
}
|
||
|
||
/*
|
||
* Skip spaces and tabs at the beginning of a line, unless
|
||
* they follow a user-requested newline.
|
||
*/
|
||
|
||
while (isspace(UCHAR(*p))) {
|
||
if (*p == '\n') {
|
||
p++;
|
||
break;
|
||
}
|
||
p++;
|
||
}
|
||
}
|
||
|
||
height = numLines * (msgPtr->fontPtr->ascent
|
||
+ msgPtr->fontPtr->descent) + 2*msgPtr->borderWidth
|
||
+ 2*msgPtr->padY;
|
||
if (inc <= 2) {
|
||
break;
|
||
}
|
||
aspect = (100*(maxWidth + 2*msgPtr->borderWidth
|
||
+ 2*msgPtr->padX))/height;
|
||
if (aspect < lowerBound) {
|
||
width += inc;
|
||
} else if (aspect > upperBound) {
|
||
width -= inc;
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
msgPtr->lineLength = maxWidth;
|
||
msgPtr->msgHeight = numLines * (msgPtr->fontPtr->ascent
|
||
+ msgPtr->fontPtr->descent);
|
||
Tk_GeometryRequest(msgPtr->tkwin,
|
||
maxWidth + 2*msgPtr->borderWidth + 2*msgPtr->padX, height);
|
||
Tk_SetInternalBorder(msgPtr->tkwin, msgPtr->borderWidth);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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;
|
||
char *p;
|
||
int x, y, lineLength, numChars, charsLeft;
|
||
|
||
msgPtr->flags &= ~REDRAW_PENDING;
|
||
if ((msgPtr->tkwin == NULL) || !Tk_IsMapped(tkwin)) {
|
||
return;
|
||
}
|
||
if (msgPtr->flags & CLEAR_NEEDED) {
|
||
XClearWindow(msgPtr->display, Tk_WindowId(tkwin));
|
||
msgPtr->flags &= ~CLEAR_NEEDED;
|
||
}
|
||
|
||
/*
|
||
* Compute starting y-location for message based on message size
|
||
* and anchor option.
|
||
*/
|
||
|
||
switch (msgPtr->anchor) {
|
||
case TK_ANCHOR_NW: case TK_ANCHOR_N: case TK_ANCHOR_NE:
|
||
y = msgPtr->borderWidth + msgPtr->padY;
|
||
break;
|
||
case TK_ANCHOR_W: case TK_ANCHOR_CENTER: case TK_ANCHOR_E:
|
||
y = (Tk_Height(tkwin) - msgPtr->msgHeight)/2;
|
||
break;
|
||
default:
|
||
y = Tk_Height(tkwin) - msgPtr->borderWidth - msgPtr->padY
|
||
- msgPtr->msgHeight;
|
||
break;
|
||
}
|
||
y += msgPtr->fontPtr->ascent;
|
||
|
||
/*
|
||
* Work through the string to display one line at a time.
|
||
* Display each line in three steps. First compute the
|
||
* line's width, then figure out where to display the
|
||
* line to justify it properly, then display the line.
|
||
*/
|
||
|
||
for (p = msgPtr->string, charsLeft = msgPtr->numChars; *p != 0;
|
||
y += msgPtr->fontPtr->ascent + msgPtr->fontPtr->descent) {
|
||
if (*p == '\n') {
|
||
p++;
|
||
charsLeft--;
|
||
continue;
|
||
}
|
||
numChars = TkMeasureChars(msgPtr->fontPtr, p, charsLeft, 0,
|
||
msgPtr->lineLength, TK_WHOLE_WORDS|TK_AT_LEAST_ONE,
|
||
&lineLength);
|
||
switch (msgPtr->anchor) {
|
||
case TK_ANCHOR_NW: case TK_ANCHOR_W: case TK_ANCHOR_SW:
|
||
x = msgPtr->borderWidth + msgPtr->padX;
|
||
break;
|
||
case TK_ANCHOR_N: case TK_ANCHOR_CENTER: case TK_ANCHOR_S:
|
||
x = (Tk_Width(tkwin) - msgPtr->lineLength)/2;
|
||
break;
|
||
default:
|
||
x = Tk_Width(tkwin) - msgPtr->borderWidth - msgPtr->padX
|
||
- msgPtr->lineLength;
|
||
break;
|
||
}
|
||
if (msgPtr->justify == TK_JUSTIFY_CENTER) {
|
||
x += (msgPtr->lineLength - lineLength)/2;
|
||
} else if (msgPtr->justify == TK_JUSTIFY_RIGHT) {
|
||
x += msgPtr->lineLength - lineLength;
|
||
}
|
||
TkDisplayChars(msgPtr->display, Tk_WindowId(tkwin),
|
||
msgPtr->textGC, msgPtr->fontPtr, p, numChars, x, y, 0);
|
||
p += numChars;
|
||
charsLeft -= numChars;
|
||
|
||
/*
|
||
* Skip blanks at the beginning of a line, unless they follow
|
||
* a user-requested newline.
|
||
*/
|
||
|
||
while (isspace(UCHAR(*p))) {
|
||
charsLeft--;
|
||
if (*p == '\n') {
|
||
p++;
|
||
break;
|
||
}
|
||
p++;
|
||
}
|
||
}
|
||
|
||
if (msgPtr->relief != TK_RELIEF_FLAT) {
|
||
Tk_Draw3DRectangle(msgPtr->display, Tk_WindowId(tkwin),
|
||
msgPtr->border, 0, 0, Tk_Width(tkwin), Tk_Height(tkwin),
|
||
msgPtr->borderWidth, msgPtr->relief);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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)) {
|
||
if ((msgPtr->tkwin != NULL) && !(msgPtr->flags & REDRAW_PENDING)) {
|
||
Tk_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
|
||
msgPtr->flags |= REDRAW_PENDING;
|
||
}
|
||
} else if (eventPtr->type == DestroyNotify) {
|
||
Tcl_DeleteCommand(msgPtr->interp, Tk_PathName(msgPtr->tkwin));
|
||
msgPtr->tkwin = NULL;
|
||
if (msgPtr->flags & REDRAW_PENDING) {
|
||
Tk_CancelIdleCall(DisplayMessage, (ClientData) msgPtr);
|
||
}
|
||
Tk_EventuallyFree((ClientData) msgPtr, DestroyMessage);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* 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)) {
|
||
Tcl_SetVar2(interp, name1, name2, msgPtr->string,
|
||
flags & TCL_GLOBAL_ONLY);
|
||
Tcl_TraceVar2(interp, name1, name2,
|
||
TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
|
||
MessageTextVarProc, clientData);
|
||
}
|
||
return (char *) NULL;
|
||
}
|
||
|
||
value = Tcl_GetVar2(interp, name1, name2, flags & TCL_GLOBAL_ONLY);
|
||
if (value == NULL) {
|
||
value = "";
|
||
}
|
||
if (msgPtr->string != NULL) {
|
||
ckfree(msgPtr->string);
|
||
}
|
||
msgPtr->numChars = strlen(value);
|
||
msgPtr->string = ckalloc((unsigned) (msgPtr->numChars + 1));
|
||
strcpy(msgPtr->string, value);
|
||
ComputeMessageGeometry(msgPtr);
|
||
|
||
msgPtr->flags |= CLEAR_NEEDED;
|
||
if ((msgPtr->tkwin != NULL) && Tk_IsMapped(msgPtr->tkwin)
|
||
&& !(msgPtr->flags & REDRAW_PENDING)) {
|
||
Tk_DoWhenIdle(DisplayMessage, (ClientData) msgPtr);
|
||
msgPtr->flags |= REDRAW_PENDING;
|
||
}
|
||
return (char *) NULL;
|
||
}
|