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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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public
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plan
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src
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help.c
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C/C++ Source or Header
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1994-08-01
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7KB
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245 lines
/*
* print help popup on a particular topic. Help topics are identified by
* a short string that is looked up in the help file. The help file contains
* a list of button help entries; each consisting of a line "%% topic"
* followed by help text lines. Leading blanks in text lines are ignored.
* Lines beginning with '#' are ignored.
*
* To add a help text to a widget, call
* XtAddCallback(widget, XmNhelpCallback, help_callback, "topic")
* and add "%%n topic" and the help text to the help file (n is a number
* used for extracting a user's manual, it is not used by the plan program).
*
* help_callback(parent, topic) Print help for a topic, usually for
* button <parent>.
*/
#include <stdio.h>
#include <Xm/Xm.h>
#include <Xm/DialogS.h>
#include <Xm/Form.h>
#include <Xm/Frame.h>
#include <Xm/LabelP.h>
#include <Xm/LabelG.h>
#include <Xm/PushBP.h>
#include <Xm/PushBG.h>
#include <Xm/ToggleB.h>
#include <Xm/Text.h>
#include <Xm/Protocols.h>
#include <X11/cursorfont.h>
#include "cal.h"
static void done_callback(), context_callback();
static char *get_text();
extern void *malloc(), *realloc();
extern BOOL find_file();
extern Display *display; /* everybody uses the same server */
extern XFontStruct *font[NFONTS]; /* fonts: FONT_* */
extern Pixel color[NCOLS]; /* colors: COL_* */
static BOOL have_shell; /* message popup exists if TRUE */
static Widget shell; /* popup menu shell */
/*
* destroy the help popup. Remove it from the screen, and destroy its widgets.
*/
destroy_help_popup()
{
if (have_shell) {
XtPopdown(shell);
XTDESTROYWIDGET(shell);
have_shell = FALSE;
}
}
/*
* look up the help text for <topic> and create a window containing the text.
*/
/*ARGSUSED*/
void help_callback(parent, topic)
Widget parent;
char *topic;
{
static BOOL have_fontlist;
static XmFontList fontlist;
static Widget text_w;
Widget form, w;
Atom closewindow;
char *message;
Arg args[20];
int n;
int nlines = 1;
char *p;
if (!(message = get_text(topic)))
return;
if (have_shell) {
XmTextSetString(text_w, message);
XtPopup(shell, XtGrabNone);
return;
}
if (!have_fontlist++)
fontlist = XmFontListCreate(font[FONT_HELP], "cset");
for (nlines=0, p=message; *p; p++)
nlines += *p == '\n';
if (nlines > 30)
nlines = 30;
n = 0;
XtSetArg(args[n], XmNdeleteResponse, XmDO_NOTHING); n++;
XtSetArg(args[n], XmNiconic, False); n++;
shell = XtAppCreateShell("Help", "plan",
applicationShellWidgetClass, display, args, n);
# ifdef EDITRES
XtAddEventHandler(shell, (EventMask)0, TRUE,
_XEditResCheckMessages, NULL);
# endif
set_icon(shell, 1);
form = XtCreateManagedWidget("helpform", xmFormWidgetClass,
shell, NULL, 0);
XtAddCallback(form, XmNhelpCallback, (XtCallbackProc)help_callback,
(XtPointer)"help");
/*-- buttons --*/
n = 0;
XtSetArg(args[n], XmNbottomAttachment, XmATTACH_FORM); n++;
XtSetArg(args[n], XmNbottomOffset, 8); n++;
XtSetArg(args[n], XmNrightAttachment, XmATTACH_FORM); n++;
XtSetArg(args[n], XmNrightOffset, 8); n++;
XtSetArg(args[n], XmNwidth, 80); n++;
w = XtCreateManagedWidget("Dismiss", xmPushButtonWidgetClass,
form, args, n);
XtAddCallback(w, XmNactivateCallback, done_callback, (XtPointer)0);
XtAddCallback(w, XmNhelpCallback, (XtCallbackProc)help_callback,
(XtPointer)"help_done");
n = 0;
XtSetArg(args[n], XmNbottomAttachment, XmATTACH_FORM); n++;
XtSetArg(args[n], XmNbottomOffset, 8); n++;
XtSetArg(args[n], XmNrightAttachment, XmATTACH_WIDGET); n++;
XtSetArg(args[n], XmNrightWidget, w); n++;
XtSetArg(args[n], XmNrightOffset, 8); n++;
XtSetArg(args[n], XmNwidth, 80); n++;
w = XtCreateManagedWidget("Context", xmPushButtonWidgetClass,
form, args, n);
XtAddCallback(w, XmNactivateCallback, context_callback, (XtPointer)0);
XtAddCallback(w, XmNhelpCallback, (XtCallbackProc)help_callback,
(XtPointer)"help");
/*-- text --*/
n = 0;
XtSetArg(args[n], XmNtopAttachment, XmATTACH_FORM); n++;
XtSetArg(args[n], XmNtopOffset, 8); n++;
XtSetArg(args[n], XmNbottomAttachment, XmATTACH_WIDGET); n++;
XtSetArg(args[n], XmNbottomWidget, w); n++;
XtSetArg(args[n], XmNbottomOffset, 16); n++;
XtSetArg(args[n], XmNleftAttachment, XmATTACH_FORM); n++;
XtSetArg(args[n], XmNleftOffset, 8); n++;
XtSetArg(args[n], XmNrightAttachment, XmATTACH_FORM); n++;
XtSetArg(args[n], XmNrightOffset, 8); n++;
XtSetArg(args[n], XmNhighlightThickness,0); n++;
XtSetArg(args[n], XmNeditable, False); n++;
XtSetArg(args[n], XmNeditMode, XmMULTI_LINE_EDIT); n++;
XtSetArg(args[n], XmNcolumns, 60); n++;
XtSetArg(args[n], XmNrows, nlines+1); n++;
XtSetArg(args[n], XmNfontList, fontlist); n++;
XtSetArg(args[n], XmNscrollVertical, True); n++;
XtSetArg(args[n], XmNpendingDelete, False); n++;
text_w = w = XmCreateScrolledText(form, "text", args, n);
XmTextSetString(w, message);
XtManageChild(w);
XtAddCallback(w, XmNhelpCallback, (XtCallbackProc)help_callback,
(XtPointer)"help");
XtPopup(shell, XtGrabNone);
closewindow = XmInternAtom(display, "WM_DELETE_WINDOW", False);
XmAddWMProtocolCallback(shell, closewindow,
done_callback, (XtPointer)shell);
have_shell = TRUE;
free(message);
}
/*ARGSUSED*/
static void done_callback(widget, item, data)
Widget widget;
int item;
XmToggleButtonCallbackStruct *data;
{
destroy_help_popup();
}
/*ARGSUSED*/
static void context_callback(widget, item, data)
Widget widget;
int item;
XmToggleButtonCallbackStruct *data;
{
Widget w;
Cursor cursor = XCreateFontCursor(display, XC_question_arrow);
if (w = XmTrackingLocate(shell, cursor, False)) {
data->reason = XmCR_HELP;
XtCallCallbacks(w, XmNhelpCallback, &data);
}
XFreeCursor(display, cursor);
}
/*ARGSUSED*/
static char *get_text(topic)
char *topic;
{
FILE *fp; /* help file */
char line[1024]; /* line buffer (and filename)*/
char *text; /* text buffer */
int textsize; /* size of text buffer */
int textlen = 0; /* # of chars in text buffer */
int n; /* for stripping trailing \n */
register char *p;
if (!(text = (char *)malloc(textsize = 4096)))
return(0);
*text = 0;
if (!find_file(line, HELP_FN, FALSE) || !(fp = fopen(line, "r"))) {
sprintf(text, "Sorry, no help available,\n%s not found",
HELP_FN);
return(text);
}
for (;;) { /* find topic */
if (!fgets(line, 1024, fp)) {
strcpy(text, "Sorry, no help available");
return(text);
}
if (line[0] != '%' || line[1] != '%')
continue;
line[strlen(line)-1] = 0; /* strip \n */
for (p=line+2; *p >= '0' && *p <= '9'; p++);
for (; *p == ' ' || *p == '\t'; p++);
if (*p && *p != '\n' && !strcmp(p, topic))
break;
}
for (;;) { /* read text */
if (!fgets(line, 1024, fp))
break;
if (line[0] == '#')
continue;
if (line[0] == '%' && line[1] == '%')
return(text);
p = line[0] == '\t' ? line+1 : line;
if (textlen + strlen(p) > textsize)
if (!(text = (char *)realloc(text, textsize += 4096)))
break;
strcat(text, p);
textlen += strlen(p);
}
for (n=strlen(text); n && text[n-1] == '\n'; n--)
text[n-1] = 0;
return(text);
}