Create new InxWidget base class for extension widgets.

14 files changed, 259 insertions, 135 deletions

diff --git a/src/extension/CMakeLists.txt b/src/extension/CMakeLists.txt
index 83ea6accb..a747f6d45 100644
--- a/src/extension/CMakeLists.txt
+++ b/src/extension/CMakeLists.txt
@@ -62,6 +62,7 @@ set(extension_SRC
 	prefdialog/parameter-notebook.cpp
 	prefdialog/parameter-optiongroup.cpp
 	prefdialog/parameter-string.cpp
+	prefdialog/widget.cpp
 
 	# ------
 	# Header
@@ -136,6 +137,7 @@ set(extension_SRC
 	prefdialog/parameter-notebook.h
 	prefdialog/parameter-optiongroup.h
 	prefdialog/parameter-string.h
+	prefdialog/widget.h
 )
 
 if(WIN32)
diff --git a/src/extension/prefdialog/parameter-bool.cpp b/src/extension/prefdialog/parameter-bool.cpp
index 6131272ec..56a1305ce 100644
--- a/src/extension/prefdialog/parameter-bool.cpp
+++ b/src/extension/prefdialog/parameter-bool.cpp
@@ -121,7 +121,7 @@ Gtk::Widget *ParamBool::get_widget(SPDocument *doc, Inkscape::XML::Node *node, s
         return nullptr;
     }
 
-    auto hbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_HORIZONTAL, Parameter::GUI_PARAM_WIDGETS_SPACING));
+    auto hbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_HORIZONTAL, GUI_PARAM_WIDGETS_SPACING));
     hbox->set_homogeneous(false);
 
     ParamBoolCheckButton * checkbox = Gtk::manage(new ParamBoolCheckButton(this, _text, doc, node, changeSignal));
diff --git a/src/extension/prefdialog/parameter-color.cpp b/src/extension/prefdialog/parameter-color.cpp
index 44bac3513..b29f603f3 100644
--- a/src/extension/prefdialog/parameter-color.cpp
+++ b/src/extension/prefdialog/parameter-color.cpp
@@ -75,7 +75,7 @@ Gtk::Widget *ParamColor::get_widget( SPDocument * /*doc*/, Inkscape::XML::Node *
         _changeSignal = new sigc::signal<void>(*changeSignal);
     }
 
-    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, Parameter::GUI_PARAM_WIDGETS_SPACING));
+    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, GUI_PARAM_WIDGETS_SPACING));
     Gtk::Widget *selector = Gtk::manage(new ColorNotebook(_color));
     hbox->pack_start(*selector, true, true, 0);
     selector->show();
diff --git a/src/extension/prefdialog/parameter-description.cpp b/src/extension/prefdialog/parameter-description.cpp
index 7ab607a54..9c6912d81 100644
--- a/src/extension/prefdialog/parameter-description.cpp
+++ b/src/extension/prefdialog/parameter-description.cpp
@@ -100,7 +100,7 @@ Gtk::Widget *ParamDescription::get_widget (SPDocument * /*doc*/, Inkscape::XML::
     //     This means texts can not shrink anymore (they can still grow, though) and it's also necessary
     //     to prevent https://bugzilla.gnome.org/show_bug.cgi?id=773572
     int len = newtext.length();
-    label->set_width_chars(len > Parameter::GUI_MAX_LINE_LENGTH ? Parameter::GUI_MAX_LINE_LENGTH : len);
+    label->set_width_chars(len > GUI_MAX_LINE_LENGTH ? GUI_MAX_LINE_LENGTH : len);
 
     label->show();
 
diff --git a/src/extension/prefdialog/parameter-float.cpp b/src/extension/prefdialog/parameter-float.cpp
index d4e7ce01f..852ac37ac 100644
--- a/src/extension/prefdialog/parameter-float.cpp
+++ b/src/extension/prefdialog/parameter-float.cpp
@@ -162,7 +162,7 @@ Gtk::Widget *ParamFloat::get_widget(SPDocument *doc, Inkscape::XML::Node *node,
         return nullptr;
     }
 
-    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, Parameter::GUI_PARAM_WIDGETS_SPACING));
+    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, GUI_PARAM_WIDGETS_SPACING));
 
     auto pfa = new ParamFloatAdjustment(this, doc, node, changeSignal);
     Glib::RefPtr<Gtk::Adjustment> fadjust(pfa);
diff --git a/src/extension/prefdialog/parameter-int.cpp b/src/extension/prefdialog/parameter-int.cpp
index 3464a4579..4be385b2e 100644
--- a/src/extension/prefdialog/parameter-int.cpp
+++ b/src/extension/prefdialog/parameter-int.cpp
@@ -146,7 +146,7 @@ ParamInt::get_widget (SPDocument *doc, Inkscape::XML::Node *node, sigc::signal<v
         return nullptr;
     }
 
-    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, Parameter::GUI_PARAM_WIDGETS_SPACING));
+    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, GUI_PARAM_WIDGETS_SPACING));
 
     auto pia = new ParamIntAdjustment(this, doc, node, changeSignal);
     Glib::RefPtr<Gtk::Adjustment> fadjust(pia);
diff --git a/src/extension/prefdialog/parameter-notebook.cpp b/src/extension/prefdialog/parameter-notebook.cpp
index 443f935dc..2cbe8531a 100644
--- a/src/extension/prefdialog/parameter-notebook.cpp
+++ b/src/extension/prefdialog/parameter-notebook.cpp
@@ -90,15 +90,15 @@ Gtk::Widget *ParamNotebook::ParamNotebookPage::get_widget(SPDocument *doc, Inksc
     }
 
     Gtk::VBox * vbox = Gtk::manage(new Gtk::VBox);
-    vbox->set_border_width(Parameter::GUI_BOX_MARGIN);
-    vbox->set_spacing(Parameter::GUI_BOX_SPACING);
+    vbox->set_border_width(GUI_BOX_MARGIN);
+    vbox->set_spacing(GUI_BOX_SPACING);
 
     // add parameters onto page (if any)
     for (auto parameter : parameters) {
         Gtk::Widget *parameter_widget = parameter->get_widget(doc, node, changeSignal);
         if (parameter_widget) {
             int indent = parameter->get_indent();
-            parameter_widget->set_margin_start(indent *Parameter::GUI_INDENTATION);
+            parameter_widget->set_margin_start(indent *GUI_INDENTATION);
             vbox->pack_start(*parameter_widget, false, false, 0);
 
             const gchar *tooltip = parameter->get_tooltip();
diff --git a/src/extension/prefdialog/parameter-optiongroup.cpp b/src/extension/prefdialog/parameter-optiongroup.cpp
index 4d746f524..07f60b897 100644
--- a/src/extension/prefdialog/parameter-optiongroup.cpp
+++ b/src/extension/prefdialog/parameter-optiongroup.cpp
@@ -254,7 +254,7 @@ Gtk::Widget *ParamOptionGroup::get_widget(SPDocument *doc, Inkscape::XML::Node *
         return nullptr;
     }
 
-    auto hbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_HORIZONTAL, Parameter::GUI_PARAM_WIDGETS_SPACING));
+    auto hbox = Gtk::manage(new Gtk::Box(Gtk::ORIENTATION_HORIZONTAL, GUI_PARAM_WIDGETS_SPACING));
 
     Gtk::Label *label = Gtk::manage(new Gtk::Label(_text, Gtk::ALIGN_START));
     hbox->pack_start(*label, false, false);
diff --git a/src/extension/prefdialog/parameter-string.cpp b/src/extension/prefdialog/parameter-string.cpp
index a51adbf8e..b62fae499 100644
--- a/src/extension/prefdialog/parameter-string.cpp
+++ b/src/extension/prefdialog/parameter-string.cpp
@@ -141,7 +141,7 @@ Gtk::Widget *ParamString::get_widget(SPDocument *doc, Inkscape::XML::Node *node,
         return nullptr;
     }
 
-    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, Parameter::GUI_PARAM_WIDGETS_SPACING));
+    Gtk::HBox *hbox = Gtk::manage(new Gtk::HBox(false, GUI_PARAM_WIDGETS_SPACING));
     Gtk::Label *label = Gtk::manage(new Gtk::Label(_text, Gtk::ALIGN_START));
     label->show();
     hbox->pack_start(*label, false, false);
diff --git a/src/extension/prefdialog/parameter.cpp b/src/extension/prefdialog/parameter.cpp
index 5716a3be8..c60928752 100644
--- a/src/extension/prefdialog/parameter.cpp
+++ b/src/extension/prefdialog/parameter.cpp
@@ -27,6 +27,7 @@
 #include "parameter-notebook.h"
 #include "parameter-optiongroup.h"
 #include "parameter-string.h"
+#include "widget.h"
 
 #include "extension/extension.h"
 
@@ -190,7 +191,7 @@ guint32 Parameter::set_color(guint32 in, SPDocument *doc, Inkscape::XML::Node *n
 
 
 Parameter::Parameter (Inkscape::XML::Node *in_repr, Inkscape::Extension::Extension *ext)
-    : _extension(ext)
+    : InxWidget(in_repr, ext)
 {
     // name (mandatory for all paramters)
     const char *name = in_repr->attribute("name");
@@ -199,29 +200,6 @@ Parameter::Parameter (Inkscape::XML::Node *in_repr, Inkscape::Extension::Extensi
     }
     _name = g_strdup(name);
 
-
-    // translatable (optional, required to translate gui-text and gui-description)
-    const char *translatable = in_repr->attribute("translatable");
-    if (translatable) {
-        if (!strcmp(translatable, "yes")) {
-            _translatable = YES;
-        } else if (!strcmp(translatable, "no"))  {
-            _translatable = NO;
-        } else {
-            g_warning("Invalid value ('%s') for translatable attribute of parameter '%s' in extension '%s'",
-                      translatable, _name, _extension->get_id());
-        }
-    }
-
-    // context (optional, required to translate gui-text and gui-description)
-    const char *context = in_repr->attribute("context");
-    if (!context) {
-        context = in_repr->attribute("msgctxt"); // backwards-compatibility with previous name
-    }
-    if (context) {
-        _context = g_strdup(context);
-    }
-
     // gui-text (TODO: should likely be mandatory for all parameters; maybe not for hidden ones?)
     const char *gui_text = in_repr->attribute("gui-text");
     if (!gui_text) {
@@ -245,26 +223,6 @@ Parameter::Parameter (Inkscape::XML::Node *in_repr, Inkscape::Extension::Extensi
         }
         _description = g_strdup(gui_description);
     }
-
-    // gui-hidden (optional)
-    const char *gui_hidden = in_repr->attribute("gui-hidden");
-    if (gui_hidden != nullptr) {
-        if (strcmp(gui_hidden, "true") == 0) {
-            _hidden = true;
-        }
-    }
-
-    // indent (optional)
-    const char *indent = in_repr->attribute("indent");
-    if (indent != nullptr) {
-        _indent = strtol(indent, nullptr, 0);
-    }
-
-    // appearance (optional, does not apply to all parameters)
-    const char *appearance = in_repr->attribute("appearance");
-    if (appearance) {
-        _appearance = g_strdup(appearance);
-    }
 }
 
 Parameter::~Parameter()
@@ -277,12 +235,6 @@ Parameter::~Parameter()
 
     g_free(_description);
     _description = nullptr;
-
-    g_free(_appearance);
-    _description = nullptr;
-
-    g_free(_context);
-    _context = nullptr;
 }
 
 gchar *Parameter::pref_name() const
@@ -290,13 +242,6 @@ gchar *Parameter::pref_name() const
     return g_strdup_printf("%s.%s", _extension->get_id(), _name);
 }
 
-/** Basically, if there is no widget pass a NULL. */
-Gtk::Widget *
-Parameter::get_widget (SPDocument * /*doc*/, Inkscape::XML::Node * /*node*/, sigc::signal<void> * /*changeSignal*/)
-{
-    return nullptr;
-}
-
 /** If I'm not sure which it is, just don't return a value. */
 void Parameter::string(std::string &/*string*/) const
 {
@@ -323,11 +268,6 @@ Parameter *Parameter::get_param(const gchar */*name*/)
     return nullptr;
 }
 
-
-const char *Parameter::get_translation(const char* msgid) {
-    return _extension->get_translation(msgid, _context);
-}
-
 Glib::ustring const extension_pref_root = "/extensions/";
 
 }  // namespace Extension
diff --git a/src/extension/prefdialog/parameter.h b/src/extension/prefdialog/parameter.h
index e9dbd6efc..822c93416 100644
--- a/src/extension/prefdialog/parameter.h
+++ b/src/extension/prefdialog/parameter.h
@@ -14,27 +14,12 @@
 #ifndef SEEN_INK_EXTENSION_PARAM_H__
 #define SEEN_INK_EXTENSION_PARAM_H__
 
-#include <string>
+#include "widget.h" // TODO: Necessary?
 
-#include <sigc++/sigc++.h>
-#include <glibmm/ustring.h>
-
-class SPDocument;
-
-namespace Gtk {
-class Widget;
-}
 
 namespace Inkscape {
-namespace XML {
-class Node;
-}
-
 namespace Extension {
 
-class Extension;
-
-
 /**
  * The root directory in the preferences database for extension-related parameters.
  *
@@ -51,13 +36,8 @@ extern Glib::ustring const extension_pref_root;
  * around.  There is also a few functions that are used by all the
  * different parameters.
  */
-class Parameter {
+class Parameter : public InxWidget {
 public:
-
-    enum Translatable {
-        UNSET, YES, NO
-    };
-
     Parameter(Inkscape::XML::Node *in_repr,
               Inkscape::Extension::Extension *ext);
 
@@ -128,16 +108,8 @@ public:
      */
     static Parameter *make(Inkscape::XML::Node *in_repr, Inkscape::Extension::Extension *in_ext);
 
-    virtual Gtk::Widget *get_widget(SPDocument *doc, Inkscape::XML::Node *node, sigc::signal<void> *changeSignal);
-
     const gchar *get_tooltip() const { return _description; }
 
-    /** Indicates if the GUI for this parameter is hidden or not */
-    bool get_hidden() const { return _hidden; }
-
-    /** Indentation level of the parameter */
-    int get_indent() const { return _indent; }
-
     virtual void string(std::list <std::string> &list) const;
 
     /**
@@ -150,16 +122,8 @@ public:
     virtual Parameter *get_param(gchar const *name);
 
 
-    /** Recommended margin of boxes containing multiple Parameters (in px) */
-    const static int GUI_BOX_MARGIN = 10;
-    /** Recommended spacing between multiple Parameters packed into a box (in px) */
-    const static int GUI_BOX_SPACING = 4;
     /** Recommended spacing between the widgets making up a single Parameter (e.g. label and input) (in px) */
     const static int GUI_PARAM_WIDGETS_SPACING = 4;
-    /** Recommended indentation width of parameters (in px) */
-    const static int GUI_INDENTATION = 12;
-    /** Recommended maximum line length for wrapping textual parameters (in chars) */
-    const static int GUI_MAX_LINE_LENGTH = 60;
 
 
     /** An error class for when a parameter is called on a type it is not */
@@ -174,9 +138,6 @@ public:
 
 
 protected:
-    /** Which extension is this parameter attached to. */
-    Inkscape::Extension::Extension *_extension = nullptr;
-
     /** The name of this parameter. */
     gchar *_name = nullptr;
 
@@ -186,32 +147,13 @@ protected:
     /** Extended description of the parameter (currently shown as tooltip on hover). */
     gchar *_description = nullptr;
 
-    /** Whether the parameter is visible. */
-    bool _hidden = false;
-
-    /** Indentation level of the parameter. */
-    int _indent = 0;
-
-    /** Appearance of the parameter (not used by all Parameters). */
-    gchar *_appearance = nullptr;
-
-    /** Is parameter translatable? */
-    Translatable _translatable = UNSET;
-
-    /** context for translation of translatable strings. */
-    gchar *_context = nullptr;
-
 
-    /* **** funcs **** */
+    /* **** member functions **** */
 
     /**
      * Build the name to write the parameter from the extension's ID and the name of this parameter.
      */
     gchar *pref_name() const;
-    
-    /** gets the gettext translation for msgid
-      * Handles translation domain of the extension and message context of the parameter internally */
-    const char *get_translation(const char* msgid);
 };
 
 }  // namespace Extension
diff --git a/src/extension/prefdialog/prefdialog.cpp b/src/extension/prefdialog/prefdialog.cpp
index a1966ec8d..66aaccc62 100644
--- a/src/extension/prefdialog/prefdialog.cpp
+++ b/src/extension/prefdialog/prefdialog.cpp
@@ -87,10 +87,10 @@ PrefDialog::PrefDialog (Glib::ustring name, Gtk::Widget * controls, Effect * eff
         auto sep = Gtk::manage(new Gtk::Separator());
         sep->show();
 
-        this->get_content_area()->pack_start(*sep, false, false, Parameter::GUI_BOX_SPACING);
+        this->get_content_area()->pack_start(*sep, false, false, InxWidget::GUI_BOX_SPACING);
 
         hbox = Gtk::manage(new Gtk::HBox());
-        hbox->set_border_width(Parameter::GUI_BOX_MARGIN);
+        hbox->set_border_width(InxWidget::GUI_BOX_MARGIN);
         _button_preview = _param_preview->get_widget(nullptr, nullptr, &_signal_preview);
         _button_preview->show();
         hbox->pack_start(*_button_preview, true, true, 0);
diff --git a/src/extension/prefdialog/widget.cpp b/src/extension/prefdialog/widget.cpp
new file mode 100644
index 000000000..ea02970ca
--- /dev/null
+++ b/src/extension/prefdialog/widget.cpp
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Parameters for extensions.
+ *//*
+ * Author:
+ *   Patrick Storz <eduard.braun2@gmx.de>
+ *
+ * Copyright (C) 2019 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "widget.h"
+
+#include <sigc++/sigc++.h>
+
+#include "extension/extension.h"
+
+#include "xml/node.h"
+
+
+namespace Inkscape {
+namespace Extension {
+
+InxWidget *InxWidget::make(Inkscape::XML::Node *in_repr, Inkscape::Extension::Extension *in_ext)
+{
+    InxWidget *widget = nullptr;
+
+    // Note: param could equal nullptr
+    return widget;
+}
+
+InxWidget::InxWidget (Inkscape::XML::Node *in_repr, Inkscape::Extension::Extension *ext)
+    : _extension(ext)
+{
+    // translatable (optional)
+    const char *translatable = in_repr->attribute("translatable");
+    if (translatable) {
+        if (!strcmp(translatable, "yes")) {
+            _translatable = YES;
+        } else if (!strcmp(translatable, "no"))  {
+            _translatable = NO;
+        } else {
+            g_warning("Invalid value ('%s') for translatable attribute of widget '%s' in extension '%s'",
+                      translatable, in_repr->name(), _extension->get_id());
+        }
+    }
+
+    // context (optional)
+    const char *context = in_repr->attribute("context");
+    if (!context) {
+        context = in_repr->attribute("msgctxt"); // backwards-compatibility with previous name
+    }
+    if (context) {
+        _context = g_strdup(context);
+    }
+
+    // gui-hidden (optional)
+    const char *gui_hidden = in_repr->attribute("gui-hidden");
+    if (gui_hidden != nullptr) {
+        if (strcmp(gui_hidden, "true") == 0) {
+            _hidden = true;
+        }
+    }
+
+    // indent (optional)
+    const char *indent = in_repr->attribute("indent");
+    if (indent != nullptr) {
+        _indent = strtol(indent, nullptr, 0);
+    }
+
+    // appearance (optional, does not apply to all parameters)
+    const char *appearance = in_repr->attribute("appearance");
+    if (appearance) {
+        _appearance = g_strdup(appearance);
+    }
+}
+
+InxWidget::~InxWidget()
+{
+    g_free(_context);
+    _context = nullptr;
+
+    g_free(_appearance);
+    _appearance = nullptr;
+}
+
+/** Basically, if there is no widget pass a NULL. */
+Gtk::Widget *
+InxWidget::get_widget (SPDocument * /*doc*/, Inkscape::XML::Node * /*node*/, sigc::signal<void> * /*changeSignal*/)
+{
+    return nullptr;
+}
+
+const char *InxWidget::get_translation(const char* msgid) {
+    return _extension->get_translation(msgid, _context);
+}
+
+}  // namespace Extension
+}  // 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 :
diff --git a/src/extension/prefdialog/widget.h b/src/extension/prefdialog/widget.h
new file mode 100644
index 000000000..7887f5579
--- /dev/null
+++ b/src/extension/prefdialog/widget.h
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Base class for extension widgets.
+ *//*
+ * Authors:
+ *   Patrick Storz <eduard.braun2@gmx.de>
+ *
+ * Copyright (C) 2019 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_INK_EXTENSION_WIDGET_H
+#define SEEN_INK_EXTENSION_WIDGET_H
+
+#include <string>
+
+#include <sigc++/sigc++.h>
+#include <glibmm/ustring.h>
+
+class SPDocument;
+
+namespace Gtk {
+class Widget;
+}
+
+namespace Inkscape {
+namespace XML {
+class Node;
+}
+
+namespace Extension {
+
+class Extension;
+
+
+/**
+ * Base class to represent all widgets of an extension (including parameters)
+ */
+class InxWidget {
+public:
+
+    enum Translatable {
+        UNSET, YES, NO
+    };
+
+    InxWidget(Inkscape::XML::Node *in_repr, Inkscape::Extension::Extension *in_ext);
+
+    virtual ~InxWidget();
+
+    /**
+     * Creates a new extension widget for usage in a prefdialog.
+     *
+     * The type of widget created is parsed from the XML representation passed in,
+     * and the suitable subclass constructor is called.
+     *
+     * For specialized widget types (like parameters) we defer to the subclass function of the same name.
+     *
+     * @param  in_repr The XML representation describing the widget.
+     * @param  in_ex t The extension the widget belongs to.
+     * @return a pointer to a new Widget if applicable, null otherwise..
+     */
+    static InxWidget *make(Inkscape::XML::Node *in_repr, Inkscape::Extension::Extension *in_ext);
+
+    virtual Gtk::Widget *get_widget(SPDocument *doc, Inkscape::XML::Node *node, sigc::signal<void> *changeSignal);
+
+    /** Indicates if the widget is hidden or not */
+    bool get_hidden() const { return _hidden; }
+
+    /** Indentation level of the widget */
+    int get_indent() const { return _indent; }
+
+
+    /** Recommended margin of boxes containing multiple Widgets (in px) */
+    const static int GUI_BOX_MARGIN = 10;
+    /** Recommended spacing between multiple Widgets packed into a box (in px) */
+    const static int GUI_BOX_SPACING = 4;
+    /** Recommended indentation width of Widgets(in px) */
+    const static int GUI_INDENTATION = 12;
+    /** Recommended maximum line length for wrapping textual Widgets (in chars) */
+    const static int GUI_MAX_LINE_LENGTH = 60;
+
+protected:
+    /** Which extension is this Widget attached to. */
+    Inkscape::Extension::Extension *_extension = nullptr;
+
+    /** Whether the Widget is visible. */
+    bool _hidden = false;
+
+    /** Indentation level of the Widget. */
+    int _indent = 0;
+
+    /** Appearance of the Widget (not used by all Widgets). */
+    gchar *_appearance = nullptr;
+
+    /** Is Widget translatable? */
+    Translatable _translatable = UNSET;
+
+    /** context for translation of translatable strings. */
+    gchar *_context = nullptr;
+
+
+    /* **** member functions **** */
+
+    /** gets the gettext translation for msgid
+      *
+      * Handles translation domain of the extension and message context of the Widget internally
+      *
+      * @param msgid String to translate
+      * @return      Translated string
+      */
+    const char *get_translation(const char* msgid);
+};
+
+}  // namespace Extension
+}  // namespace Inkscape
+
+#endif // SEEN_INK_EXTENSION_WIDGET_H
+
+/*
+  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 :