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/*
* this file is an attempt at making a "control box" routine that will
* take an array of variables and make a bunch of sliders to control
* each of the variables. It will put them in their own form widget
* and return the form widget which you can then place wherever you like.
*
* The idea here is that a lot of times you just have a bunch of
* parameters you want to control with sliders. It should be easy
* to do that, and this function is an attempt at making it easy.
* All you should have to do with this is declare an array of SliderVal
* structures describing the parameters you want to have under slider
* control (i.e. min, max, size_shown and their name) and blammo! you've
* got a nice box with a title that has a bunch of sliders that control
* your variables. You also have access to the underlying slider widgets
* in case you need to change the parameters.
*
* Dominic Giampaolo
* dbg@sgi.com
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "libsx.h"
#include "controlbox.h"
static void
change_val(Widget w, float new_val, void *arg)
{
SliderVar *var = (SliderVar *)arg;
char buff[256];
sprintf(buff, "%f", new_val);
SetStringEntry(var->text, buff);
*var->val = new_val;
}
static void
str_change_val(Widget w, char *txt, void *arg)
{
SliderVar *var = (SliderVar *)arg;
float new_val;
char buff[256];
if (txt == NULL)
return;
if (*txt != '.' && *txt != '-' && isdigit(*txt) == 0)
return;
new_val = atof(txt);
if (new_val < 0)
{
new_val = 0.0;
sprintf(buff, "%f", new_val);
SetStringEntry(var->text, buff);
}
if (new_val > var->max)
{
new_val = var->max;
sprintf(buff, "%f", new_val);
SetStringEntry(var->text, buff);
}
SetScrollbar(var->slider, new_val, var->max, var->shown);
*var->val = new_val;
}
Widget
MakeControlBox(char *title_str, SliderVar *vars)
{
int i, longest_len, longest_index, num_sliders;
Widget form, title = None, *label, *slider, *text, previous_form;
XFont font;
previous_form = GetForm();
form = MakeForm(TOP_LEVEL_FORM); /* the parent could be passed in */
if (form == NULL)
return NULL;
if (title_str)
title = MakeLabel(title_str);
longest_len = -1;
font = GetWidgetFont(form);
for(i=0; vars[i].name != NULL; i++)
{
int len;
if (font != NULL)
len = TextWidth(font, vars[i].name);
else
len = strlen(vars[i].name);
if (len > longest_len)
{
longest_len = len;
longest_index = i;
}
}
/*
* At this point "i" contains how many sliders we need to create.
* We'll use this information to allocate some arrays to hold
* the widget pointers we get back from the MakeXXX() functions.
* We need to save the values so that we can set their position later.
*/
num_sliders = i;
label = calloc(1, num_sliders*sizeof(Widget));
slider = calloc(1, num_sliders*sizeof(Widget));
text = calloc(1, num_sliders*sizeof(Widget));
if (label == NULL || slider == NULL || text == NULL)
{
if (label) free(label);
if (slider) free(slider);
if (text) free(text);
return NULL;
}
/*
* First we just create the widgets, then we'll lay them out.
*/
for(i=0; i < num_sliders; i++)
{
char buff[256];
sprintf(buff, "%f", *vars[i].val);
label[i] = MakeLabel(vars[i].name);
slider[i] = MakeHorizScrollbar(250, change_val, &vars[i]);
text[i] = MakeStringEntry(buff, 100, str_change_val, &vars[i]);
vars[i].slider = slider[i]; /* save it for the user */
vars[i].text = text[i];
if (label[i] == NULL || slider[i] == NULL || text == NULL)
{
/* XXX -- destroy the widgets? how? */
free(label);
free(slider);
free(text);
return NULL;
}
SetScrollbar(slider[i], *vars[i].val, vars[i].max, vars[i].shown);
}
/*
* Here we set the positions of all the widgets we just created.
* We set the first row of things just under the title string
* if there was one. All the sliders always get put to the right
* of the widest name (based on the width of text).
*/
if (title)
{
AttachEdge(title, TOP_EDGE, ATTACH_TOP);
AttachEdge(title, BOTTOM_EDGE, ATTACH_TOP);
AttachEdge(title, LEFT_EDGE, ATTACH_LEFT);
AttachEdge(title, RIGHT_EDGE, ATTACH_LEFT);
}
for(i=0; i < num_sliders; i++)
{
if (i == 0)
{
SetWidgetPos(label[i], PLACE_UNDER, title, NO_CARE, NULL);
SetWidgetPos(slider[i], PLACE_RIGHT, label[longest_index],
PLACE_UNDER, title);
SetWidgetPos(text[i], PLACE_RIGHT, slider[i], PLACE_UNDER, title);
}
else
{
SetWidgetPos(label[i], PLACE_UNDER, label[i-1], NO_CARE, NULL);
SetWidgetPos(slider[i], PLACE_RIGHT, label[longest_index],
PLACE_UNDER, label[i-1]);
SetWidgetPos(text[i], PLACE_RIGHT, slider[i],PLACE_UNDER,label[i-1]);
}
AttachEdge(label[i], TOP_EDGE, ATTACH_TOP);
AttachEdge(label[i], BOTTOM_EDGE, ATTACH_TOP);
AttachEdge(label[i], LEFT_EDGE, ATTACH_LEFT);
AttachEdge(label[i], RIGHT_EDGE, ATTACH_LEFT);
AttachEdge(slider[i], TOP_EDGE, ATTACH_TOP);
AttachEdge(slider[i], BOTTOM_EDGE, ATTACH_TOP);
AttachEdge(slider[i], LEFT_EDGE, ATTACH_LEFT);
AttachEdge(slider[i], RIGHT_EDGE, ATTACH_RIGHT);
AttachEdge(text[i], TOP_EDGE, ATTACH_TOP);
AttachEdge(text[i], BOTTOM_EDGE, ATTACH_TOP);
AttachEdge(text[i], LEFT_EDGE, ATTACH_RIGHT);
AttachEdge(text[i], RIGHT_EDGE, ATTACH_RIGHT);
}
SetForm(previous_form);
return form;
}
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