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IABSD.fr/xenocara/app/xgc/choice.c
matthieu
- app/xgc/choice.c
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/* $XFree86$ */ /* ** xgc ** ** choice.c ** ** All the generic stuff for dealing with choice widgets. */ #include <stdio.h> #include <X11/Intrinsic.h> #include <X11/StringDefs.h> #include <X11/Xaw/Form.h> #include <X11/Xaw/Label.h> #include <X11/Xaw/Toggle.h> #include "xgc.h" static void print_text_to_buffer(Widget, caddr_t, caddr_t); /* create_choice(w,info) ** --------------------- ** What a choice widget is: A collection of toggle buttons placed inside ** a form widget. Exactly one of these toggle buttons can be "on" at ** any given time; the rest are "off". "On" toggle buttons have ** the foreground and background colors reversed. ** Also, specifically because it comes in handy in xgc, choosing one ** of the buttons causes a string associated with it to be printed out ** (and interpreted). Half of the string is global to the whole form ** and the other half is local to each button. ** ** For example, pressing the "xor" button in the "function" form would ** cause xgc to interpret the string "function xor", thus changing the ** function in the GC to xor. ** ** There's also a label widget to the left of that mess, with an ** incredibly descriptive title. ** ** create_choice() makes one. ** ** w is the form widget (already created) into which we will place the ** toggle buttons. info contains lots of useful information, such ** as the names of the buttons and their strings (see xgc.h). */ ChoiceDesc * create_choice(Widget w, XgcStuff *info) { ChoiceDesc *choice; /* What we will return. Contains ** Widget ID's of the label and toggles. */ int i; /* Counter */ char *text; /* Text to be interpreted when the ** toggle widget is selected. */ /* ArgList for the label widget */ static Arg labelargs[] = { {XtNborderWidth, (XtArgVal) 0}, {XtNjustify, (XtArgVal) XtJustifyRight}, {XtNvertDistance, (XtArgVal) 4} }; /* ArgList for the toggle widgets */ static Arg toggleargs[] = { {XtNfromHoriz, (XtArgVal) NULL}, {XtNfromVert, (XtArgVal) NULL}, {XtNhorizDistance, (XtArgVal) 4}, {XtNvertDistance, (XtArgVal) 4}, {XtNradioGroup, (XtArgVal) NULL}, {XtNcallback, (XtArgVal) NULL} }; /* Callback list for the toggle widgets */ static XtCallbackRec callbacklist[] = { {(XtCallbackProc) print_text_to_buffer, NULL}, {NULL, NULL} }; /* Allocate space for the widgets and initialize choice */ choice = (ChoiceDesc *) XtMalloc(sizeof(ChoiceDesc)); choice->widgets = (WidgetList) XtMalloc(sizeof(Widget) * info->choice.num_toggles); choice->size = info->choice.num_toggles; choice->label = XtCreateManagedWidget(info->choice.name,labelWidgetClass,w, labelargs,XtNumber(labelargs)); /* set up the toggle widgets */ toggleargs[5].value = (XtArgVal) callbacklist; for (i = 0; i < info->choice.num_toggles; ++i) { if (i == 0) { /* the upper left toggle; put it next to the label and don't worry about radio groups */ toggleargs[0].value = (XtArgVal) choice->label; toggleargs[1].value = (XtArgVal) NULL; toggleargs[2].value = (XtArgVal) 10; toggleargs[3].value = (XtArgVal) 4; toggleargs[4].value = (XtArgVal) NULL; } else { toggleargs[4].value = (XtArgVal) choice->widgets[0]; /* are we starting a new row? */ if (info->choice.columns > 0 && i > 1 && (i % (info->choice.columns) == 0)) { toggleargs[0].value = (XtArgVal) choice->label; /* under the appropriate toggle */ toggleargs[1].value = (XtArgVal) choice->widgets[i - info->choice.columns]; toggleargs[2].value = (XtArgVal) 10; toggleargs[3].value = (XtArgVal) 4; } else { /* we're in the middle of a row */ /* to the right of the previous toggle */ toggleargs[0].value = (XtArgVal) choice->widgets[i - 1]; toggleargs[1].value = (XtArgVal) NULL; toggleargs[2].value = (XtArgVal) -1; /* overlapping slightly */ toggleargs[3].value = (XtArgVal) 4; } if (info->choice.columns > 0 && i >= info->choice.columns) { /* correct vertical spacing */ toggleargs[1].value = (XtArgVal) choice->widgets[i - info->choice.columns]; toggleargs[3].value = (XtArgVal) -1; } } /* Put the correct stuff in the text field */ text = (char *) XtMalloc((unsigned) (strlen(info->choice.text) + strlen((info->data)[i].text) + 3)); strcpy(text, info->choice.text); strcat(text, " "); strcat(text, (info->data)[i].text); strcat(text, "\n"); callbacklist[0].closure = (caddr_t) text; /* Create it finally */ choice->widgets[i] = XtCreateManagedWidget((info->data[i]).name, toggleWidgetClass, w, toggleargs, XtNumber(toggleargs)); } /* The toggle widgets have all been created; ** now make the all the same width if that's ** what we want to do. */ if (info->choice.columns > 0) { Dimension maxwidth = 0; /* maximum width we've found */ Dimension width; /* width of the current widget */ static Arg args[] = { /* for getting and setting the width */ {XtNwidth, (XtArgVal) NULL} }; args[0].value = (XtArgVal) &width; /* Find the maximum width of any toggle widget */ for (i = 0; i < info->choice.num_toggles; ++i) { XtGetValues(choice->widgets[i],args,1); maxwidth = max(maxwidth,width); } /* Now set them all to that width */ args[0].value = (XtArgVal) maxwidth; for (i = 0; i < info->choice.num_toggles; ++i) XtSetValues(choice->widgets[i],args,1); } /* return the list of toggles that were just created */ return (choice); } /* select_button(choice,togglenum) ** ------------------------------- ** "Selects" the togglenumth toggle widget in the choice layout ** represented by choice. It simply turns the widget on, as if the ** user had selected it, without calling any callbacks. It's used ** to give feedback when reading from a script. */ void select_button(ChoiceDesc *choice, int togglenum) { static Arg toggleargs[] = { {XtNstate, (XtArgVal) True} }; XtSetValues(choice->widgets[togglenum],toggleargs,XtNumber(toggleargs)); } /* line_up_labels(descs,numdescs) ** ------------------------------ ** descs represents a bunch of choice layouts (numdescs is the size of ** descs). This function sets each label in descs to the same width, ** thus making them line up nicely since they're all on the left margin. */ void line_up_labels(ChoiceDesc *descs[], int numdescs) { int i; /* counter */ Dimension width; /* current width */ Dimension maxwidth = (Dimension) 0; /* max width found */ static Arg widthargs[] = { {XtNwidth, (XtArgVal) NULL } }; widthargs[0].value = (XtArgVal) &width; /* Find the maximum width */ for (i = 0; i < numdescs; ++i) { XtGetValues(descs[i]->label, widthargs, XtNumber(widthargs)); maxwidth = max(maxwidth,width); } /* Set all labels to that width */ widthargs[0].value = (XtArgVal) maxwidth; for (i = 0; i < numdescs; ++i) { XtSetValues(descs[i]->label, widthargs, XtNumber(widthargs)); } } /* choose_defaults(descs,numdescs) ** ------------------------------- ** descs represents a bunch of choice layouts (numdescs is the size of ** descs). This function goes through all of descs and selects the ** appropriate toggle widget for each one. This includes calling ** the callbacks associated with that widget. ** ** This function ends up initializing both the screen and the GC, and ** ensures that they are consistent. */ void choose_defaults(ChoiceDesc *descs[], int numdescs) { int i; /* which choice layout */ int j; /* which toggle within it */ for (i = 0; i < numdescs; ++i) { j = 0; if (i == 0) j = 3; select_button(descs[i],j); XtCallCallbacks(descs[i]->widgets[j], XtNcallback, (caddr_t) NULL); } } /* print_text_to_buffer(w,closure,call_data) ** ----------------------------------------- ** This is also in the list of callbacks for the toggle buttons in a ** choice widget. It sends the string contained in closure (which ** was set way back in create_choice()) over to interpret(), which ** decides what to do with it. */ /*ARGSUSED*/ static void print_text_to_buffer( Widget w, caddr_t closure, /* contains the string */ caddr_t call_data) { interpret((char *) closure); /* Gee, that was easy */ }