1 files changed, 135 insertions, 0 deletions
diff --git a/src/ui/widget/imagetoggler.cpp b/src/ui/widget/imagetoggler.cpp
new file mode 100644
index 0000000..7a0c295
--- /dev/null
+++ b/src/ui/widget/imagetoggler.cpp
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ *   Jon A. Cruz
+ *   Johan B. C. Engelen
+ *
+ * Copyright (C) 2006-2008 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gtkmm/iconinfo.h>
+
+#include "ui/widget/imagetoggler.h"
+
+#include "ui/icon-loader.h"
+#include "ui/icon-names.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+ImageToggler::ImageToggler( char const* on, char const* off) :
+    Glib::ObjectBase(typeid(ImageToggler)),
+    Gtk::CellRenderer(),
+    _pixOnName(on),
+    _pixOffName(off),
+    _property_active(*this, "active", false),
+    _property_activatable(*this, "activatable", true),
+    _property_gossamer(*this, "gossamer", false),
+    _property_pixbuf_on(*this, "pixbuf_on", Glib::RefPtr<Gdk::Pixbuf>(nullptr)),
+    _property_pixbuf_off(*this, "pixbuf_off", Glib::RefPtr<Gdk::Pixbuf>(nullptr))
+{
+    property_mode() = Gtk::CELL_RENDERER_MODE_ACTIVATABLE;
+    Gtk::IconSize::lookup(Gtk::ICON_SIZE_MENU, _size, _size);
+}
+
+void ImageToggler::get_preferred_height_vfunc(Gtk::Widget& widget, int& min_h, int& nat_h) const
+{
+    min_h = _size + 6;
+    nat_h = _size + 8;
+}
+
+void ImageToggler::get_preferred_width_vfunc(Gtk::Widget& widget, int& min_w, int& nat_w) const
+{
+    min_w = _size + 12;
+    nat_w = _size + 16;
+}
+
+void ImageToggler::render_vfunc( const Cairo::RefPtr<Cairo::Context>& cr,
+                                 Gtk::Widget& widget,
+                                 const Gdk::Rectangle& background_area,
+                                 const Gdk::Rectangle& cell_area,
+                                 Gtk::CellRendererState flags )
+{
+    // Lazy/late pixbuf rendering to get access to scale factor from widget.
+    if(!_property_pixbuf_on.get_value()) {
+        int scale = widget.get_scale_factor();
+        _property_pixbuf_on = sp_get_icon_pixbuf(_pixOnName, _size * scale);
+        _property_pixbuf_off = sp_get_icon_pixbuf(_pixOffName, _size * scale);
+    }
+
+    // Hide when not being used.
+    double alpha = 1.0;
+    bool visible = _property_activatable.get_value()
+                || _property_active.get_value();
+    if (!visible) {
+        // XXX There is conflict about this value, some users want 0.2, others want 0.0
+        alpha = 0.0;
+    }
+    if (_property_gossamer.get_value()) {
+        alpha += 0.2;
+    }
+    if (alpha <= 0.0) {
+        return;
+    }
+
+    Glib::RefPtr<Gdk::Pixbuf> pixbuf;
+    if(_property_active.get_value()) {
+        pixbuf = _property_pixbuf_on.get_value();
+    } else {
+        pixbuf = _property_pixbuf_off.get_value();
+    }
+
+    cairo_surface_t *surface = gdk_cairo_surface_create_from_pixbuf(
+            pixbuf->gobj(), 0, widget.get_window()->gobj());
+    g_return_if_fail(surface);
+
+    // Center the icon in the cell area
+    int x = cell_area.get_x() + int((cell_area.get_width() - _size) * 0.5);
+    int y = cell_area.get_y() + int((cell_area.get_height() - _size) * 0.5);
+
+    cairo_set_source_surface(cr->cobj(), surface, x, y);
+    cr->set_operator(Cairo::OPERATOR_ATOP);
+    cr->rectangle(x, y, _size, _size);
+    if (alpha < 1.0) {
+        cr->clip();
+        cr->paint_with_alpha(alpha);
+    } else {
+        cr->fill();
+    }
+    cairo_surface_destroy(surface); // free!
+}
+
+bool
+ImageToggler::activate_vfunc(GdkEvent* event,
+                            Gtk::Widget& /*widget*/,
+                            const Glib::ustring& path,
+                            const Gdk::Rectangle& /*background_area*/,
+                            const Gdk::Rectangle& /*cell_area*/,
+                            Gtk::CellRendererState /*flags*/)
+{
+    _signal_pre_toggle.emit(event);
+    _signal_toggled.emit(path);
+
+    return false;
+}
+
+
+} // 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 :
+
+