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canvas: add ::set_size_request_to_display_given_text() analogous to Gtkmm2ext utility

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This commit is contained in:
Paul Davis 2021-09-07 14:45:31 -06:00
parent 90322399fc
commit 494bc8da14
2 changed files with 41 additions and 0 deletions
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1
libs/canvas/canvas/item.h
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@ -150,6 +150,7 @@ public:
virtual void size_request (double& w, double& h) const;
void set_size_request (double w, double h);
void set_size_request_to_display_given_text (const std::vector<std::string>& strings, gint hpadding, gint vpadding);
void size_allocate (Rect const&);
virtual void _size_allocate (Rect const&);

40
libs/canvas/item.cc
View file

@ -656,6 +656,46 @@ Item::set_size_request (double w, double h)
end_change ();
}
void
Item::set_size_request_to_display_given_text (const std::vector<std::string>& strings, gint hpadding, gint vpadding)
{
Glib::RefPtr<Pango::Context> context = _canvas->get_pango_context();
Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
int width, height;
int width_max = 0;
int height_max = 0;
vector<string> copy;
const vector<string>* to_use;
vector<string>::const_iterator i;
for (i = strings.begin(); i != strings.end(); ++i) {
if ((*i).find_first_of ("gy") != string::npos) {
/* contains a descender */
break;
}
}
if (i == strings.end()) {
/* make a copy of the strings then add one that has a descender */
copy = strings;
copy.push_back ("g");
to_use = &copy;
} else {
to_use = &strings;
}
for (vector<string>::const_iterator i = to_use->begin(); i != to_use->end(); ++i) {
layout->set_text (*i);
layout->get_pixel_size (width, height);
width_max = max (width_max,width);
height_max = max (height_max, height);
}
set_size_request (width_max + hpadding, height_max + vpadding);
}
/** @return Bounding box in this item's coordinates */
ArdourCanvas::Rect
Item::bounding_box () const