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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
* Combobox for selecting dash patterns - implementation.
*/
/* Author:
* Lauris Kaplinski <lauris@kaplinski.com>
* bulia byak <buliabyak@users.sf.net>
* Maximilian Albert <maximilian.albert@gmail.com>
*
* Copyright (C) 2002 Lauris Kaplinski
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "dash-selector.h"
#include <cstring>
#include <glibmm/i18n.h>
#include <2geom/coord.h>
#include <numeric>
#include "preferences.h"
#include "display/cairo-utils.h"
#include "style.h"
#include "ui/dialog-events.h"
namespace Inkscape {
namespace UI {
namespace Widget {
gchar const *const DashSelector::_prefs_path = "/palette/dashes";
static std::vector<std::vector<double>> s_dashes;
DashSelector::DashSelector()
: Gtk::Box(Gtk::ORIENTATION_HORIZONTAL, 4),
_preview_width(100),
_preview_height(16),
_preview_lineheight(2)
{
// TODO: find something more sensible here!!
init_dashes();
_dash_store = Gtk::ListStore::create(dash_columns);
_dash_combo.set_model(_dash_store);
_dash_combo.pack_start(_image_renderer);
_dash_combo.set_cell_data_func(_image_renderer, sigc::mem_fun(*this, &DashSelector::prepareImageRenderer));
_dash_combo.set_tooltip_text(_("Dash pattern"));
_dash_combo.show();
_dash_combo.signal_changed().connect( sigc::mem_fun(*this, &DashSelector::on_selection) );
// show dashes in two columns to eliminate or minimize scrolling
_dash_combo.set_wrap_width(2);
this->pack_start(_dash_combo, true, true, 0);
_offset = Gtk::Adjustment::create(0.0, 0.0, 1000.0, 0.1, 1.0, 0.0);
_offset->signal_value_changed().connect(sigc::mem_fun(*this, &DashSelector::offset_value_changed));
_sb = new Inkscape::UI::Widget::SpinButton(_offset, 0.1, 2);
_sb->set_tooltip_text(_("Pattern offset"));
sp_dialog_defocus_on_enter_cpp(_sb);
_sb->set_width_chars(4);
_sb->show();
this->pack_start(*_sb, false, false, 0);
for (std::size_t i = 0; i < s_dashes.size(); ++i) {
Gtk::TreeModel::Row row = *(_dash_store->append());
row[dash_columns.dash] = i;
}
_pattern = &s_dashes.front();
}
DashSelector::~DashSelector() {
// FIXME: for some reason this doesn't get called; does the call to manage() in
// sp_stroke_style_line_widget_new() not processed correctly?
}
void DashSelector::prepareImageRenderer( Gtk::TreeModel::const_iterator const &row ) {
// dashes are rendered on the fly to adapt to current theme colors
std::size_t index = (*row)[dash_columns.dash];
Cairo::RefPtr<Cairo::Surface> surface;
if (index == 1) {
// add the custom one as a second option; it'll show up at the top of second column
surface = sp_text_to_pixbuf((char *)"Custom");
}
else if (index < s_dashes.size()) {
// add the dash to the combobox
surface = sp_dash_to_pixbuf(s_dashes[index]);
}
else {
surface = Cairo::RefPtr<Cairo::Surface>(new Cairo::Surface(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 1, 1)));
g_warning("No surface in prepareImageRenderer.");
}
_image_renderer.property_surface() = surface;
}
static std::vector<double> map_values(const std::vector<SPILength>& values) {
std::vector<double> out;
out.reserve(values.size());
for (auto&& v : values) {
out.push_back(v.value);
}
return out;
}
void DashSelector::init_dashes() {
if (s_dashes.empty()) {
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
std::vector<Glib::ustring> dash_prefs = prefs->getAllDirs(_prefs_path);
if (!dash_prefs.empty()) {
SPStyle style;
s_dashes.reserve(dash_prefs.size() + 1);
for (auto & dash_pref : dash_prefs) {
style.readFromPrefs( dash_pref );
if (!style.stroke_dasharray.values.empty()) {
s_dashes.emplace_back(map_values(style.stroke_dasharray.values));
} else {
s_dashes.emplace_back(std::vector<double>());
}
}
} else {
g_warning("Missing stock dash definitions. DashSelector::init_dashes.");
// This code may never execute - a new preferences.xml is created for a new user. Maybe if the user deletes dashes from preferences.xml?
s_dashes.emplace_back(std::vector<double>());
}
std::vector<double> custom {1, 2, 1, 4}; // 'custom' dashes second on the list, so they are at the top of the second column in a combo box
s_dashes.insert(s_dashes.begin() + 1, custom);
}
}
void DashSelector::set_dash(const std::vector<double>& dash, double offset) {
int pos = -1; // Allows custom patterns to remain unscathed by this.
double delta = std::accumulate(dash.begin(), dash.end(), 0.0) / (10000.0 * (dash.empty() ? 1 : dash.size()));
int index = 0;
for (auto&& pattern : s_dashes) {
if (dash.size() == pattern.size() &&
std::equal(dash.begin(), dash.end(), pattern.begin(),
[=](double a, double b) { return Geom::are_near(a, b, delta); })) {
pos = index;
break;
}
++index;
}
if (pos >= 0) {
_pattern = &s_dashes.at(pos);
_dash_combo.set_active(pos);
_offset->set_value(offset);
}
else { // Hit a custom pattern in the SVG, write it into the combobox.
pos = 1; // the one slot for custom patterns
_pattern = &s_dashes[pos];
_pattern->assign(dash.begin(), dash.end());
_dash_combo.set_active(pos);
_offset->set_value(offset);
}
}
const std::vector<double>& DashSelector::get_dash(double* offset) const {
if (offset) *offset = _offset->get_value();
return *_pattern;
}
double DashSelector::get_offset() {
return _offset ? _offset->get_value() : 0.0;
}
/**
* Fill a pixbuf with the dash pattern using standard cairo drawing
*/
Cairo::RefPtr<Cairo::Surface> DashSelector::sp_dash_to_pixbuf(const std::vector<double>& pattern) {
auto device_scale = get_scale_factor();
auto height = _preview_height * device_scale;
auto width = _preview_width * device_scale;
cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_t *ct = cairo_create(s);
auto context = get_style_context();
Gdk::RGBA fg = context->get_color(get_state_flags());
cairo_set_line_width (ct, _preview_lineheight * device_scale);
cairo_scale (ct, _preview_lineheight * device_scale, 1);
cairo_move_to (ct, 0, height/2);
cairo_line_to (ct, width, height/2);
cairo_set_dash(ct, pattern.data(), pattern.size(), 0);
cairo_set_source_rgb(ct, fg.get_red(), fg.get_green(), fg.get_blue());
cairo_stroke (ct);
cairo_destroy(ct);
cairo_surface_flush(s);
cairo_surface_set_device_scale(s, device_scale, device_scale);
return Cairo::RefPtr<Cairo::Surface>(new Cairo::Surface(s));
}
/**
* Fill a pixbuf with a text label using standard cairo drawing
*/
Cairo::RefPtr<Cairo::Surface> DashSelector::sp_text_to_pixbuf(const char* text) {
auto device_scale = get_scale_factor();
cairo_surface_t *s = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, _preview_width * device_scale, _preview_height * device_scale);
cairo_t *ct = cairo_create(s);
cairo_select_font_face (ct, "Sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
// todo: how to find default font face and size?
cairo_set_font_size (ct, 12 * device_scale);
auto context = get_style_context();
Gdk::RGBA fg = context->get_color(get_state_flags());
cairo_set_source_rgb(ct, fg.get_red(), fg.get_green(), fg.get_blue());
cairo_move_to (ct, 16.0 * device_scale, 13.0 * device_scale);
cairo_show_text (ct, text);
cairo_destroy(ct);
cairo_surface_flush(s);
cairo_surface_set_device_scale(s, device_scale, device_scale);
return Cairo::RefPtr<Cairo::Surface>(new Cairo::Surface(s));
}
void DashSelector::on_selection()
{
_pattern = &s_dashes.at(_dash_combo.get_active()->get_value(dash_columns.dash));
changed_signal.emit();
}
void DashSelector::offset_value_changed()
{
Glib::ustring offset = _("Pattern offset");
offset += " (";
offset += Glib::ustring::format(_sb->get_value());
offset += ")";
_sb->set_tooltip_text(offset.c_str());
changed_signal.emit();
}
} // namespace Widget
} // namespace UI
} // namespace Inkscape
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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