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align_widget.cxx
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//
// Alignment code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2023 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include "align_widget.h"
#include "fluid.h"
#include "Fl_Group_Type.h"
#include "undo.h"
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
/**
the first behavior always uses the first selected widget as a reference
the second behavior uses the largest widget (most extreme positions) as
a reference.
*/
#define BREAK_ON_FIRST break
//#define BREAK_ON_FIRST
void align_widget_cb(Fl_Widget*, long how)
{
const int max = 32768, min = -32768;
int left, right, top, bot, wdt, hgt, n;
Fl_Type *o;
int changed = 0;
switch ( how )
{
//---- align
case 10: // align left
left = max;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->x()<left)
left = w->x();
BREAK_ON_FIRST;
}
if (left!=max)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(left, w->y(), w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
case 11: // align h.center
left = max; right = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->x()<left)
left = w->x();
if (w->x()+w->w()>right)
right = w->x()+w->w();
BREAK_ON_FIRST;
}
if (left!=max)
{
int center2 = left+right;
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize((center2-w->w())/2, w->y(), w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
}
break;
case 12: // align right
right = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->x()+w->w()>right)
right = w->x()+w->w();
BREAK_ON_FIRST;
}
if (right!=min)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(right-w->w(), w->y(), w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
case 13: // align top
top = max;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->y()<top)
top = w->y();
BREAK_ON_FIRST;
}
if (top!=max)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(w->x(), top, w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
case 14: // align v.center
top = max; bot = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->y()<top)
top = w->y();
if (w->y()+w->h()>bot)
bot = w->y()+w->h();
BREAK_ON_FIRST;
}
if (top!=max)
{
int center2 = top+bot;
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(w->x(), (center2-w->h())/2, w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
}
break;
case 15: // align bottom
bot = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->y()+w->h()>bot)
bot = w->y()+w->h();
BREAK_ON_FIRST;
}
if (bot!=min)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize( w->x(), bot-w->h(), w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
//---- space evenly
case 20: // space evenly across
left = max; right = min; wdt = 0; n = 0;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->x()<left)
left = w->x();
if (w->x()+w->w()>right)
right = w->x()+w->w();
wdt += w->w();
n++;
}
wdt = (right-left)-wdt;
n--;
if (n>0)
{
wdt = wdt/n*n; // make sure that all gaps are the same, possibly moving the rightmost widget
int cnt = 0, wsum = 0;
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(left+wsum+wdt*cnt/n, w->y(), w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
cnt++;
wsum += w->w();
}
}
break;
case 21: // space evenly down
top = max; bot = min; hgt = 0, n = 0;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->y()<top)
top = w->y();
if (w->y()+w->h()>bot)
bot = w->y()+w->h();
hgt += w->h();
n++;
}
hgt = (bot-top)-hgt;
n--;
if (n>0)
{
hgt = hgt/n*n; // make sure that all gaps are the same, possibly moving the rightmost widget
int cnt = 0, hsum = 0;
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(w->x(), top+hsum+hgt*cnt/n, w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
cnt++;
hsum += w->h();
}
}
break;
//---- make same size
case 30: // same width
wdt = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->w()>wdt)
wdt = w->w();
BREAK_ON_FIRST;
}
if (wdt!=min)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize(w->x(), w->y(), wdt, w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
case 31: // same height
hgt = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->h()>hgt)
hgt = w->h();
BREAK_ON_FIRST;
}
if (hgt!=min)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize( w->x(), w->y(), w->w(), hgt);
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
case 32: // same size
hgt = min; wdt = min;
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
if (w->w()>wdt)
wdt = w->w();
if (w->h()>hgt)
hgt = w->h();
BREAK_ON_FIRST;
}
if (hgt!=min)
for (Fl_Type *o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget())
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Type::allow_layout++;
w->resize( w->x(), w->y(), wdt, hgt);
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
//---- center in group
case 40: // center hor
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget() && o->parent)
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Widget *p = ((Fl_Widget_Type *)o->parent)->o;
int center2;
if (w->window() == p) center2 = p->w();
else center2 = 2*p->x()+p->w();
Fl_Type::allow_layout++;
w->resize((center2-w->w())/2, w->y(), w->w(), w->h());
Fl_Type::allow_layout--;
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
case 41: // center vert
for (o = Fl_Type::first; o; o = o->next)
if (o->selected && o->is_widget() && o->parent)
{
if (!changed) {
changed = 1;
undo_checkpoint();
}
Fl_Widget *w = ((Fl_Widget_Type *)o)->o;
Fl_Widget *p = ((Fl_Widget_Type *)o->parent)->o;
int center2;
if (w->window() == p) center2 = p->h();
else center2 = 2*p->y()+p->h();
Fl_Type::allow_layout++;
w->resize(w->x(), (center2-w->h())/2, w->w(), w->h());
Fl_Type::allow_layout--;
set_modflag(1);
w->redraw();
if (w->window()) w->window()->redraw();
}
break;
}
if (changed)
set_modflag(1);
}