Add start of 'font-variations' widget.

Some code cleanup.

1 files changed, 132 insertions, 0 deletions

diff --git a/src/ui/widget/font-variations.cpp b/src/ui/widget/font-variations.cpp
new file mode 100644
index 000000000..84c8e97d9
--- /dev/null
+++ b/src/ui/widget/font-variations.cpp
@@ -0,0 +1,132 @@
+/*
+ * Author:
+ *   Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
+ *   Tavmjong Bah <tavmjong@free.fr>
+ *
+ * Copyright (C) 2018 Felipe Corrêa da Silva Sanches, Tavmong Bah
+ *
+ * Released under GNU GPL.  Read the file 'COPYING' for more information.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <iostream>
+#include <iomanip>
+
+#include <gtkmm.h>
+#include <glibmm/i18n.h>
+
+#include <libnrtype/font-instance.h>
+
+#include "font-variations.h"
+
+// For updating from selection
+#include "desktop.h"
+#include "object/sp-text.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+FontVariationAxis::FontVariationAxis (Glib::ustring name, OTVarAxis& axis)
+    : name (name)
+{
+    // std::cout << "FontVariationAxis::FontVariationAxis:: name: " << name << std::endl;
+    label = Gtk::manage( new Gtk::Label( name ) );
+    add( *label );
+
+    precision = 2 - int( log10(axis.maximum - axis.minimum)); 
+
+    scale = Gtk::manage( new Gtk::Scale() );
+    scale->set_range (axis.minimum, axis.maximum);
+    scale->set_value (axis.set_val);
+    scale->set_digits (precision);
+    scale->set_hexpand(true);
+    add( *scale );
+
+    show_all_children();
+}
+
+// ------------------------------------------------------------- //
+
+FontVariations::FontVariations () :
+    Gtk::Grid ()
+{
+    // std::cout << "FontVariations::FontVariations" << std::endl;
+    set_orientation( Gtk::ORIENTATION_VERTICAL );
+    set_name ("FontVariations");
+    size_group = Gtk::SizeGroup::create(Gtk::SIZE_GROUP_HORIZONTAL);
+    show_all_children();
+}
+
+
+// Update GUI based on query.
+void
+FontVariations::update( const SPStyle& query, bool different_features, Glib::ustring& font_spec ) {
+
+    font_instance* res = font_factory::Default()->FaceFromFontSpecification (font_spec.c_str());
+
+    auto children = get_children();
+    for (auto child: children) {
+        remove ( *child );
+    }
+    axes.clear();
+    
+    for (auto a: res->openTypeVarAxes) {
+        // std::cout << "Creating axis: " << a.first << std::endl;
+        FontVariationAxis* axis = Gtk::manage( new FontVariationAxis( a.first, a.second ));
+        axes.push_back( axis );
+        add( *axis );
+        size_group->add_widget( *(axis->get_label()) ); // Keep labels the same width
+    }
+
+    show_all_children();
+}
+
+void
+FontVariations::fill_css( SPCSSAttr *css ) {
+    std::cout << "FontVariations::fill_css" << std::endl;
+
+    // Eventually will want to favor using 'font-weight', etc. but at the moment these
+    // can't handle "fractional" values. See CSS Fonts Module Level 4.
+    sp_repr_css_set_property(css, "font-variation-settings", get_css_string().c_str());
+}
+
+Glib::ustring
+FontVariations::get_css_string() {
+
+    Glib::ustring css_string;
+
+    for (auto axis: axes) {
+        Glib::ustring name = axis->get_name();
+
+        // Translate the "named" axes. (Additional names in 'stat' table, may need to handle them.)
+        if (name == "Width")  name = "wdth";       // 'font-stretch'
+        if (name == "Weight") name = "wght";       // 'font-weight'
+        if (name == "Optical size") name = "opsz"; // 'font-optical-sizing' Can trigger glyph substition.
+        if (name == "Slant")  name = "slnt";       // 'font-style'
+        if (name == "Italic") name = "ital";       // 'font-style' Toggles from Roman to Italic.
+
+        std::stringstream value;
+        value << std::setprecision(axis->get_precision()) << axis->get_value();
+        css_string += "'" + name + "' " + value.str() + "', ";
+    }
+    std::cout << "  css_string: |" << css_string << "|" << std::endl;
+}
+   
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :