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livetrax/libs/canvas/box.cc

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/*
* Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
* Copyright (C) 2016-2017 Paul Davis <paul@linuxaudiosystems.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <algorithm>
#include "pbd/unwind.h"
#include "canvas/box.h"
#include "canvas/rectangle.h"
using namespace ArdourCanvas;
Box::Box (Canvas* canvas, Orientation o)
: Rectangle (canvas)
, orientation (o)
, spacing (0)
, top_padding (0), right_padding (0), bottom_padding (0), left_padding (0)
, top_margin (0), right_margin (0), bottom_margin (0), left_margin (0)
, homogenous (false)
, ignore_child_changes (false)
{
}
Box::Box (Item* parent, Orientation o)
: Rectangle (parent)
, orientation (o)
, spacing (0)
, top_padding (0), right_padding (0), bottom_padding (0), left_padding (0)
, top_margin (0), right_margin (0), bottom_margin (0), left_margin (0)
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, homogenous (false)
, ignore_child_changes (false)
{
}
Box::Box (Item* parent, Duple const & p, Orientation o)
: Rectangle (parent)
, orientation (o)
, spacing (0)
, top_padding (0), right_padding (0), bottom_padding (0), left_padding (0)
, top_margin (0), right_margin (0), bottom_margin (0), left_margin (0)
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, homogenous (false)
, ignore_child_changes (false)
{
set_position (p);
}
void
Box::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
if (_fill || _outline) {
Rectangle::render (area, context);
}
Item::render_children (area, context);
}
void
Box::compute_bounding_box () const
{
_bounding_box = Rect();
if (_items.empty()) {
bb_clean ();
return;
}
add_child_bounding_boxes (!collapse_on_hide);
if (_bounding_box) {
Rect r = _bounding_box;
/* left and top margin and padding is already built into the
* position of children
*/
_bounding_box = r.expand (0.0,
right_padding + outline_width() + right_margin,
bottom_padding + outline_width() + bottom_margin,
0.0);
}
bb_clean ();
}
void
Box::set_spacing (double s)
{
spacing = s;
}
void
Box::set_padding (double t, double r, double b, double l)
{
double last = t;
top_padding = t;
if (r >= 0) {
last = r;
}
right_padding = last;
if (b >= 0) {
last = b;
}
bottom_padding = last;
if (l >= 0) {
last = l;
}
left_padding = last;
}
void
Box::set_margin (double t, double r, double b, double l)
{
double last = t;
top_margin = t;
if (r >= 0) {
last = r;
}
right_margin = last;
if (b >= 0) {
last = b;
}
bottom_margin = last;
if (l >= 0) {
last = l;
}
left_margin = last;
}
void
Box::set_homogenous (bool yn)
{
homogenous = yn;
}
void
Box::reposition_children ()
{
Duple previous_edge = Duple (left_margin+left_padding, top_margin+top_padding);
Distance largest_width = 0;
Distance largest_height = 0;
Rect uniform_size;
if (homogenous) {
for (std::list<Item*>::iterator i = _items.begin(); i != _items.end(); ++i) {
Rect bb = (*i)->bounding_box();
if (bb) {
largest_height = std::max (largest_height, bb.height());
largest_width = std::max (largest_width, bb.width());
}
}
uniform_size = Rect (0, 0, largest_width, largest_height);
}
{
PBD::Unwinder<bool> uw (ignore_child_changes, true);
for (std::list<Item*>::iterator i = _items.begin(); i != _items.end(); ++i) {
(*i)->set_position (previous_edge);
if (homogenous) {
(*i)->size_allocate (uniform_size);
}
double width;
double height;
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(*i)->size_request (width, height);
if (orientation == Vertical) {
Distance shift = 0;
if (!(*i)->visible()) {
/* invisible child */
if (!collapse_on_hide) {
/* still add in its size */
shift += height;
}
} else {
shift += height;
}
previous_edge = previous_edge.translate (Duple (0, spacing + shift));
} else {
Distance shift = 0;
if (!(*i)->visible()) {
if (!collapse_on_hide) {
shift += width;
}
} else {
shift += width;
}
previous_edge = previous_edge.translate (Duple (spacing + shift, 0));
}
}
}
_bounding_box_dirty = true;
}
void
Box::add (Item* i)
{
if (!i) {
return;
}
Item::add (i);
queue_resize ();
}
void
Box::add_front (Item* i)
{
if (!i) {
return;
}
Item::add_front (i);
queue_resize ();
}
void
Box::layout ()
{
bool yes_do_it = _resize_queued;
Item::layout ();
if (yes_do_it) {
reposition_children ();
compute_bounding_box ();
const double w = std::max (requested_width, _bounding_box.width());
const double h = std::max (requested_height, _bounding_box.height());
set (Rect (get().x0, get().y0, get().x0 + w, get().y0 + h));
std::cerr << name << " box layed out, reset to " << get() << std::endl;
}
}
void
Box::child_changed (bool bbox_changed)
{
/* catch visibility and size changes */
if (ignore_child_changes) {
return;
}
Item::child_changed (bbox_changed);
reposition_children ();
}
void
Box::set_collapse_on_hide (bool yn)
{
if (collapse_on_hide != yn) {
collapse_on_hide = yn;
reposition_children ();
}
}
/*----*/
VBox::VBox (Canvas* c)
: Box (c, Vertical)
{
}
VBox::VBox (Item* i)
: Box (i, Vertical)
{
}
VBox::VBox (Item* i, Duple const & position)
: Box (i, position, Vertical)
{
}
HBox::HBox (Canvas* c)
: Box (c, Horizontal)
{
}
HBox::HBox (Item* i)
: Box (i, Horizontal)
{
}
HBox::HBox (Item* i, Duple const & position)
: Box (i, position, Horizontal)
{
}