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#include <string>
#include <pangomm/fontdescription.h>
#include <pangomm/layout.h>
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "pbd/file_utils.h"
#include "pbd/xml++.h"
#include "canvas/stateful_image.h"
#include "canvas/utils.h"
#include "pbd/i18n.h"
using namespace ArdourCanvas;
using PBD::error;
PBD::Searchpath StatefulImage::_image_search_path;
StatefulImage::ImageCache StatefulImage::_image_cache;
StatefulImage::StatefulImage (Canvas* c, const XMLNode& node)
: Item (c)
, _state (0)
, _font (0)
, _text_x (0)
, _text_y (0)
{
if (load_states (node)) {
throw failed_constructor();
}
}
StatefulImage::~StatefulImage()
{
delete _font;
}
void
StatefulImage::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
if (_states.empty() || _state >= _states.size()) {
return;
}
ImageHandle image = _states[_state].image;
Rect self = item_to_window (Rect (0, 0, image->get_width(), image->get_height()));
boost::optional<Rect> draw = self.intersection (area);
if (!draw) {
return;
}
/* move the origin of the image to the right place on the surface
("window" coordinates) and render it.
*/
context->set_source (image, self.x0, self.y0);
context->rectangle (draw->x0, draw->y0, draw->width(), draw->height());
context->fill ();
if (!_text.empty()) {
Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
layout->set_text (_text);
if (_font) {
layout->set_font_description (*_font);
}
// layout->set_alignment (_alignment);
set_source_rgba (context, _text_color);
context->move_to (_text_x, _text_y);
layout->show_in_cairo_context (context);
}
}
void
StatefulImage::compute_bounding_box () const
{
if (!_states.empty()) {
/* all images are assumed to be the same size */
_bounding_box = Rect (0, 0, _states[0].image->get_width(), _states[0].image->get_height());
}
}
int
StatefulImage::load_states (const XMLNode& node)
{
const XMLNodeList& nodes (node.children());
_states.clear ();
for (XMLNodeList::const_iterator i = nodes.begin(); i != nodes.end(); ++i) {
State s;
States::size_type id;
const XMLProperty* prop;
if ((prop = (*i)->property ("id")) == 0) {
error << _("no ID for state") << endmsg;
continue;
}
sscanf (prop->value().c_str(), "%" G_GSIZE_FORMAT, &id);
if ((prop = (*i)->property ("image")) == 0) {
error << _("no image for state") << endmsg;
continue;
}
if (!(s.image = find_image (prop->value()))) {
error << string_compose (_("image %1 not found for state"), prop->value()) << endmsg;
continue;
}
if (_states.size() < id) {
_states.reserve (id);
}
_states[id] = s;
}
return 0;
}
StatefulImage::ImageHandle
StatefulImage::find_image (const std::string& name)
{
ImageCache::iterator i;
if ((i = _image_cache.find (name)) != _image_cache.end()) {
return i->second;
}
std::string path;
if (!find_file (_image_search_path, name, path)) {
error << string_compose (_("Image named %1 not found"),
name) << endmsg;
return ImageHandle();
}
return Cairo::ImageSurface::create_from_png (path);
}
void
StatefulImage::set_image_search_path (const std::string& path)
{
_image_search_path = PBD::Searchpath (path);
}
void
StatefulImage::set_text (const std::string& text)
{
_text = text;
/* never alters bounding box */
redraw ();
}
bool
StatefulImage::set_state (States::size_type n)
{
if (n >= _states.size()) {
return false;
}
_state = n;
redraw ();
return true;
}
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