ardour/ardour
ardour/ardour
13
1
Fork 0
Code Pull Requests Releases Activity

canvas: continuously variable Canvas::Text height if packed inside a layout-sensitive container

Browse Source
This commit is contained in:
Paul Davis 2021-10-17 17:56:27 -06:00
parent 9d49efdc8c
commit ab22733fe4
2 changed files with 84 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
libs/canvas/canvas/text.h
View File

@ -21,6 +21,8 @@
#ifndef __ardour_canvas_text_h__
#define __ardour_canvas_text_h__
#include <map>
#include <pangomm/fontdescription.h>
#include <pangomm/layout.h>
@ -38,6 +40,7 @@ public:
void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
void compute_bounding_box () const;
void _size_allocate (Rect const&);
Gtkmm2ext::Color color () const { return _color; }
void set_color (Gtkmm2ext::Color);
@ -56,6 +59,10 @@ public:
std::string text() const { return _text; }
double text_width() const;
double text_height() const;
static int font_size_for_height (Distance height, Glib::RefPtr<Pango::Context> const &);
typedef std::map<Distance,int> FontSizeMap;
private:
std::string _text;
@ -69,8 +76,11 @@ private:
mutable bool _need_redraw;
mutable double _width_correction;
double _clamped_width;
std::string _font_family;
void _redraw () const;
static FontSizeMap font_size_map;
};
}

74
libs/canvas/text.cc
View File

@ -24,6 +24,8 @@
#include <gtkmm/window.h>
#include <gtkmm/label.h>
#include "pbd/i18n.h"
#include "canvas/text.h"
#include "canvas/canvas.h"
#include "gtkmm2ext/colors.h"
@ -31,6 +33,7 @@
using namespace std;
using namespace ArdourCanvas;
Text::FontSizeMap Text::font_size_map;
Text::Text (Canvas* c)
: Item (c)
@ -326,3 +329,74 @@ Text::text_width() const
return _width;
}
double
Text::text_height() const
{
if (_need_redraw) {
redraw ();
}
return _height;
}
void
Text::_size_allocate (Rect const & r)
{
Item::_size_allocate (r);
if (!layout_sensitive()) {
/* not doing this */
return;
}
int font_size = font_size_for_height (r.height(), _canvas->get_pango_context());
if (font_size) {
char font_name[32];
std::string family = "Sans"; // UIConfiguration::instance().get_ui_font_family();
snprintf (font_name, sizeof (font_name), "%s %d", family.c_str(), font_size);
Pango::FontDescription pfd (font_name);
set_font_description (pfd);
}
}
int
Text::font_size_for_height (Distance height, Glib::RefPtr<Pango::Context> const & ctxt)
{
FontSizeMap::iterator fsm = font_size_map.find (height);
if (fsm != font_size_map.end()) {
return fsm->second;
}
std::string family = "Sans"; // UIConfiguration::instance().get_ui_font_family();
Glib::RefPtr<Pango::Layout> l (Pango::Layout::create (ctxt));
int font_size = 0;
char font_name[32];
/* Translators: Xg is a nonsense string that should include the
highest glyph and a glyph with the lowest descender
*/
l->set_text (_("Xg"));
for (uint32_t pt = 5; pt < 24; ++pt) {
snprintf (font_name, sizeof (font_name), "%s %d", family.c_str(), pt);
Pango::FontDescription pfd (font_name);
l->set_font_description (pfd);
int w, h;
l->get_pixel_size (w, h);
if (h > height) {
font_size = pt - 1;
break;
}
}
if (font_size) {
font_size_map[height] = font_size;
}
return font_size;
}