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ArdourKnob: allow annotation, faceplate

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This commit is contained in:
Robin Gareus 2021-09-24 02:40:05 +02:00
parent fa9d3b72f3
commit 940c496f7b
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
2 changed files with 117 additions and 0 deletions
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114
libs/widgets/ardour_knob.cc
View File

@ -39,9 +39,111 @@ ArdourKnob::Element ArdourKnob::default_elements = ArdourKnob::Element (ArdourKn
ArdourKnob::ArdourKnob (Element e, Flags flags)
: ArdourCtrlBase (flags)
, _elements (e)
, _extra_height (0)
{
}
void
ArdourKnob::gen_faceplate (Pango::FontDescription const& font,
std::string const& lbl_left,
std::string const& lbl_right,
std::string const& caption)
{
_bg.clear ();
if (lbl_left.empty () && lbl_right.empty () && caption.empty ()) {
_extra_height = 0;
queue_resize ();
return;
}
Gtk::Requisition req;
on_size_request (&req);
Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (get_pango_context ());
layout->set_font_description (font);
int extra_width = 0;
int extra_height = 0;
int lbl_pos = req.width * .2; // ~65 deg
int lbl_max = req.width * .4;
int lbl_left_x = req.width * .2;
int lbl_right_x = req.width * .8;
int lbl_lr_y = req.height * .9;
if (!lbl_left.empty ()) {
int w, h;
layout->set_text (lbl_left);
layout->get_pixel_size (w, h);
extra_height = std::max (extra_height, h - req.height / 4);
if (2 * w > lbl_max) {
/* label is too long to center */
extra_width = std::max (extra_width, w - lbl_max);
// TODO set lbl_left_x, right-align text
} else {
extra_width = std::max (extra_width, w / 2 - lbl_pos);
}
}
if (!lbl_right.empty ()) {
int w, h;
layout->set_text (lbl_right);
layout->get_pixel_size (w, h);
extra_height = std::max (extra_height, h - 1);
if (2 * w > lbl_max) {
/* label is too long to center */
extra_width = std::max (extra_width, w - lbl_max);
//TODO set lbl_right_x, left-align text
} else {
extra_width = std::max (extra_width, w / 2 - lbl_pos);
}
}
if (!caption.empty ()) {
int w, h;
layout->set_text (caption);
layout->get_pixel_size (w, h);
extra_height += h;
extra_width = std::max (extra_width, w - req.width);
}
req.width += extra_width;
req.height += extra_height;
_bg = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, req.width, req.height);
Cairo::RefPtr<Cairo::Context> cr = Cairo::Context::create (_bg);
Gtkmm2ext::Color txt_color = UIConfigurationBase::instance ().color ("gtk_foreground");
Gtkmm2ext::set_source_rgba (cr, txt_color);
if (!lbl_left.empty ()) {
int w, h;
layout->set_text (lbl_left);
layout->get_pixel_size (w, h);
cr->move_to (lbl_left_x - w * .5, lbl_lr_y);
layout->show_in_cairo_context (cr);
}
if (!lbl_right.empty ()) {
int w, h;
layout->set_text (lbl_right);
layout->get_pixel_size (w, h);
cr->move_to (lbl_right_x - w * .5, lbl_lr_y);
layout->show_in_cairo_context (cr);
}
if (!caption.empty ()) {
int w, h;
layout->set_text (caption);
layout->get_pixel_size (w, h);
cr->move_to ((req.width - w) * .5, req.height - h - 2);
layout->show_in_cairo_context (cr);
}
_extra_height = extra_height;
_bg->flush ();
queue_resize ();
}
void
ArdourKnob::render (Cairo::RefPtr<Cairo::Context> const& ctx, cairo_rectangle_t*)
{
@ -50,6 +152,13 @@ ArdourKnob::render (Cairo::RefPtr<Cairo::Context> const& ctx, cairo_rectangle_t*
float width = get_width ();
float height = get_height ();
if (_bg) {
cairo_set_source_surface (cr, _bg->cobj (), 0, 0);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_paint (cr);
height -= _extra_height;
}
const float scale = std::min (width, height);
const float pointer_thickness = 3.0 * (scale / 80); // if the knob is 80 pixels wide, we want a 3-pix line on it
@ -265,6 +374,11 @@ ArdourKnob::on_size_request (Gtk::Requisition* req)
/* knob is square */
req->width = std::max (req->width, req->height);
req->height = std::max (req->width, req->height);
if (_bg) {
req->width = std::max (req->width, _bg->get_width ());
req->height = std::max (req->height, _bg->get_height ());
}
}
void

3
libs/widgets/widgets/ardour_knob.h
View File

@ -56,6 +56,9 @@ protected:
private:
Element _elements;
int _extra_height;
Cairo::RefPtr<Cairo::ImageSurface> _bg;
};
} // namespace ArdourWidgets