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Canvas: add layout-related methods and members to Item

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This commit is contained in:
Paul Davis 2020-06-10 15:52:41 -06:00
parent 142a819620
commit bcf3d170f7
2 changed files with 84 additions and 25 deletions
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89
libs/canvas/item.cc
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@ -42,6 +42,9 @@ Item::Item (Canvas* canvas)
, _scroll_parent (0)
, _visible (true)
, _bounding_box_dirty (true)
, _layout_sensitive (false)
, _intrinsic_width (-1.)
, _intrinsic_height(-1.)
, _lut (0)
, _ignore_events (false)
{
@ -56,6 +59,9 @@ Item::Item (Item* parent)
, _scroll_parent (0)
, _visible (true)
, _bounding_box_dirty (true)
, _layout_sensitive (false)
, _intrinsic_width (-1.)
, _intrinsic_height(-1.)
, _lut (0)
, _ignore_events (false)
{
@ -77,6 +83,8 @@ Item::Item (Item* parent, Duple const& p)
, _position (p)
, _visible (true)
, _bounding_box_dirty (true)
, _intrinsic_width (-1.)
, _intrinsic_height(-1.)
, _lut (0)
, _ignore_events (false)
{
@ -406,6 +414,7 @@ Item::unparent ()
{
_parent = 0;
_scroll_parent = 0;
_layout_sensitive = false;
}
void
@ -418,6 +427,7 @@ Item::reparent (Item* new_parent, bool already_added)
assert (_canvas == new_parent->canvas());
if (_parent) {
cerr << "remove " << whatami() << '/' << name << " from " << _parent->whatami() << '/' << _parent->name << endl;
_parent->remove (this);
}
@ -427,6 +437,7 @@ Item::reparent (Item* new_parent, bool already_added)
_canvas = _parent->canvas ();
find_scroll_parent ();
set_layout_sensitive (_parent->layout_sensitive());
if (!already_added) {
_parent->add (this);
@ -573,12 +584,15 @@ Item::grab_focus ()
void
Item::size_allocate (Rect const & r)
{
_allocation = r;
if (_layout_sensitive) {
_position = Duple (r.x0, r.y0);
_allocation = r;
}
}
/** @return Bounding box in this item's coordinates */
ArdourCanvas::Rect
Item::bounding_box (bool for_own_purposes) const
Item::bounding_box () const
{
if (_bounding_box_dirty) {
compute_bounding_box ();
@ -586,12 +600,6 @@ Item::bounding_box (bool for_own_purposes) const
add_child_bounding_boxes ();
}
if (!for_own_purposes) {
if (_allocation) {
return _allocation;
}
}
return _bounding_box;
}
@ -869,7 +877,7 @@ Item::prepare_for_render_children (Rect const & area) const
void
Item::add_child_bounding_boxes (bool include_hidden) const
{
Rect self;
Rect self;
Rect bbox;
bool have_one = false;
@ -949,6 +957,7 @@ Item::remove (Item* i)
}
i->unparent ();
i->set_layout_sensitive (false);
_items.remove (i);
invalidate_lut ();
_bounding_box_dirty = true;
@ -1128,14 +1137,8 @@ Item::dump (ostream& o) const
{
ArdourCanvas::Rect bb = bounding_box();
o << _canvas->indent() << whatami() << ' ' << this << " self-Visible ? " << self_visible() << " visible ? " << visible();
o << " @ " << position();
#ifdef CANVAS_DEBUG
if (!name.empty()) {
o << ' ' << name;
}
#endif
o << _canvas->indent() << whoami() << ' ' << this << " self-Visible ? " << self_visible() << " visible ? " << visible() << " layout " << layout_sensitive()
<< " @ " << position();
if (bb) {
o << endl << _canvas->indent() << "\tbbox: " << bb;
@ -1184,3 +1187,55 @@ ArdourCanvas::operator<< (ostream& o, const Item& i)
return o;
}
void
Item::set_intrinsic_size (Distance w, Distance h)
{
_intrinsic_width = w;
_intrinsic_height = h;
}
void
Item::preferred_size (Duple& minimum, Duple& natural) const
{
/* this is the default mechanism to get a preferred size. It assumes
* items whose dimensions are essentially fixed externally by calling
* various methods that set the limits, and those same limits are used
* when computing the bounding box. So ... just get the bounding box,
* and use the dimensions it specifies.
*
* Note that items that fit this assumption also cannot have their size
* adjusted by a container that they are placed in, so their miniumum
* and natural sizes are the same.
*/
if (_intrinsic_height < 0 && _intrinsic_width < 0) {
/* intrinsic size untouched, use bounding box */
Rect bb (bounding_box());
if (!bb) {
natural.x = 2;
natural.y = 2;
} else {
natural.x = bb.width();
natural.y = bb.height();
}
minimum.x = 1;
minimum.y = 1;
} else {
natural.x = _intrinsic_width;
natural.y = _intrinsic_height;
minimum = natural;
}
}
void
Item::set_layout_sensitive (bool yn)
{
_layout_sensitive = yn;
}