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Label properties change triggers reshape

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This commit is contained in:
Nikita Lisitsa 2021-02-25 15:15:42 +03:00
parent 33256b6549
commit fd7fbd4d87
2 changed files with 49 additions and 23 deletions
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6
libs/ui/include/psemek/ui/label.hpp
View file

@ -57,6 +57,9 @@ namespace psemek::ui
struct shape const & shape() const override { return shape_; }
void reshape(geom::box<float, 2> const & bbox) override;
geom::box<float, 2> size_constraints() const override;
void draw(painter & p) const override;
protected:
@ -75,9 +78,12 @@ namespace psemek::ui
{
struct font const * font = nullptr;
std::vector<glyph> glyphs;
geom::vector<float, 2> size{0.f, 0.f};
};
mutable std::optional<cached_state> cached_state_;
void update_cached_state() const;
};
}

66
libs/ui/source/label.cpp
View file

@ -39,43 +39,63 @@ namespace psemek::ui
cached_state_.reset();
}
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}}};
}
void label::draw(painter & p) const
{
if (!cached_state_)
update_cached_state();
if (!cached_state_->font) return;
auto st = style();
if (!st) return;
for (auto & g : cached_state_->glyphs)
p.draw_glyph(*(cached_state_->font), g.character, g.position, st->text_color);
}
void label::on_state_changed()
{
cached_state_.reset();
post_reshape();
}
void label::update_cached_state() const
{
cached_state_ = cached_state{};
if (text_.empty()) return;
auto st = style();
if (!st) return;
if (!st->font) return;
if (!cached_state_ || cached_state_->font != st->font.get())
{
cached_state_ = cached_state{};
cached_state_->font = st->font.get();
cached_state_->font = st->font.get();
shape_options opts;
opts.scale = st->text_scale;
cached_state_->glyphs = st->font->shape(text_, opts);
shape_options opts;
opts.scale = st->text_scale;
cached_state_->glyphs = st->font->shape(text_, opts);
geom::box<float, 2> bbox;
for (auto const & g : cached_state_->glyphs)
bbox |= g.position;
geom::box<float, 2> bbox;
for (auto const & g : cached_state_->glyphs)
bbox |= g.position;
geom::vector<float, 2> offset;
offset[0] = shape_.box[0].center() - bbox[0].length() / 2.f;
offset[1] = shape_.box[1].center() - st->text_scale * st->font->size()[1] / 2.f;
for (auto & g : cached_state_->glyphs)
g.position += offset;
}
geom::vector<float, 2> offset;
offset[0] = shape_.box[0].center() - bbox[0].length() / 2.f;
offset[1] = shape_.box[1].center() - st->text_scale * st->font->size()[1] / 2.f;
for (auto & g : cached_state_->glyphs)
p.draw_glyph(*st->font, g.character, g.position, st->text_color);
}
g.position += offset;
void label::on_state_changed()
{
// TODO: changes should notify parent about content change
element::reshape();
cached_state_->size = bbox.dimensions();
}
}