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Fix ui::label size constraints

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This commit is contained in:
Nikita Lisitsa 2021-02-26 14:35:11 +03:00
parent 3c851dfd60
commit d16a71012d
2 changed files with 36 additions and 20 deletions
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1
libs/ui/include/psemek/ui/label.hpp
View file

@ -84,6 +84,7 @@ namespace psemek::ui
mutable std::optional<cached_state> cached_state_;
void update_cached_state() const;
cached_state cached_state_for(geom::box<float, 2> const & bbox) const;
};
}

55
libs/ui/source/label.cpp
View file

@ -44,11 +44,11 @@ namespace psemek::ui
geom::box<float, 2> label::size_constraints() const
{
if (!cached_state_)
update_cached_state();
static float const inf = std::numeric_limits<float>::infinity();
return {{{cached_state_->size[0], inf}, {cached_state_->size[1], inf}}};
auto state = cached_state_for({{{0.f, inf}, {0.f, inf}}});
return {{{state.size[0], inf}, {state.size[1], inf}}};
}
void label::draw(painter & p) const
@ -82,15 +82,20 @@ namespace psemek::ui
void label::update_cached_state() const
{
cached_state_ = cached_state{};
cached_state_ = cached_state_for(shape_.box);
}
if (text_.empty()) return;
label::cached_state label::cached_state_for(geom::box<float, 2> const & bbox) const
{
auto state = cached_state{};
if (text_.empty()) return state;
auto st = style();
if (!st) return;
if (!st->font) return;
if (!st) return state;
if (!st->font) return state;
cached_state_->font = st->font.get();
state.font = st->font.get();
shape_options opts;
opts.scale = st->text_scale;
@ -100,14 +105,17 @@ namespace psemek::ui
for (auto const & g : glyphs)
raw_bbox |= g.position;
std::size_t max_lines = 1;
std::size_t max_lines;
switch (multiline_)
{
case multiline_mode::none:
max_lines = 1;
break;
case multiline_mode::minimize_lines:
max_lines = std::max(1.f, std::floor(shape_.box[1].length() / st->font->size()[1] / st->text_scale));
max_lines = std::isfinite(bbox[1].length())
? std::max<std::size_t>(1, std::floor(bbox[1].length() / st->font->size()[1] / st->text_scale))
: std::numeric_limits<std::size_t>::max();
break;
case multiline_mode::minimize_area:
throw std::runtime_error("multiline_mode::minimize_area is not supported yet");
@ -136,7 +144,7 @@ namespace psemek::ui
x_range |= glyphs[line_end].position[0];
if (x_range.length() > shape_.box[0].length())
if (x_range.length() > bbox[0].length())
break;
++line_end;
@ -190,37 +198,41 @@ namespace psemek::ui
break;
}
float max_line_size = 0.f;
for (std::size_t l = 0; l < lines.size(); ++l)
{
geom::interval<float> x_range;
for (std::size_t i = lines[l].first; i < lines[l].second; ++i)
x_range |= glyphs[i].position[0];
max_line_size = std::max(max_line_size, x_range.length());
geom::vector<float, 2> offset;
switch (halign_)
{
case halignment::left:
offset[0] = shape_.box[0].min - x_range.min;
offset[0] = bbox[0].min - x_range.min;
break;
case halignment::center:
offset[0] = shape_.box[0].center() - x_range.length() / 2.f - x_range.min;
offset[0] = bbox[0].center() - x_range.length() / 2.f - x_range.min;
break;
case halignment::right:
offset[0] = shape_.box[0].max - x_range.length() - x_range.min;
offset[0] = bbox[0].max - x_range.length() - x_range.min;
break;
}
switch (valign_)
{
case valignment::top:
offset[1] = shape_.box[1].min + l * st->text_scale * st->font->size()[1];
offset[1] = bbox[1].min + l * st->text_scale * st->font->size()[1];
break;
case valignment::center:
offset[1] = shape_.box[1].center() + (l - lines.size() / 2.f) * st->text_scale * st->font->size()[1];
offset[1] = bbox[1].center() + (l - lines.size() / 2.f) * st->text_scale * st->font->size()[1];
break;
case valignment::bottom:
offset[1] = shape_.box[1].max + (l - lines.size() * 1.f) * st->text_scale * st->font->size()[1];
offset[1] = bbox[1].max + (l - lines.size() * 1.f) * st->text_scale * st->font->size()[1];
break;
}
@ -228,8 +240,11 @@ namespace psemek::ui
glyphs[i].position += offset;
}
cached_state_->glyphs = std::move(glyphs);
cached_state_->size = raw_bbox.dimensions();
state.glyphs = std::move(glyphs);
state.size[0] = max_line_size;
state.size[1] = lines.size() * st->text_scale * st->font->size()[1];
return state;
}
}