Add initial xwidgets implementation

CMakeLists.txt

@@ -72,6 +72,8 @@ option(
 # ============
 
 find_package(xeus-zmq REQUIRED)
+find_package(xwidgets REQUIRED)
+find_package(xproperty REQUIRED)
 find_package(PNG REQUIRED)
 find_package(glad REQUIRED)
 find_package(glfw3)
@@ -112,6 +114,7 @@ set(
     include/xeus-octave/plotstream.hpp
     include/xeus-octave/tex2html.hpp
     include/xeus-octave/display.hpp
+    include/xeus-octave/xwidgets.hpp
 )
 
 set(
@@ -122,6 +125,7 @@ set(
     src/xinterpreter.cpp
     src/input.cpp
     src/output.cpp
+    src/xwidgets.cpp
 )
 
 set(XEUS_OCTAVE_MAIN_SRC src/main.cpp)
@@ -226,7 +230,7 @@ macro(xeus_octave_create_target target_name linkage output_name)
 
     target_link_libraries(
         ${target_name}
-        PUBLIC xtl PkgConfig::octinterp
+        PUBLIC xtl xwidgets PkgConfig::octinterp
         PRIVATE glad::glad glfw PNG::PNG
     )
     if(XEUS_OCTAVE_USE_SHARED_XEUS)

environment-dev.yml

@@ -3,6 +3,7 @@ channels:
 dependencies:
   # Build dependencies
   - cxx-compiler
+  - fortran-compiler
   - c-compiler
   - cmake
   - make
@@ -11,6 +12,7 @@ dependencies:
   - libuuid
   - xtl
   - xeus-zmq =1.*
+  - xwidgets =0.27.3
   - nlohmann_json
   - cppzmq
   - octave =7.*
@@ -37,4 +39,5 @@ dependencies:
   - cmake-format
   - plotly
   - ipywidgets
+  - widgetsnbextension =3.6.1
   - jupyter-dash

include/xeus-octave/plotstream.hpp

@@ -1,44 +1,91 @@
-/*
- * Copyright (C) 2020 Giulio Girardi.
+/***************************************************************************
+ * Copyright (c) 2022, Giulio Girardi
  *
- * This file is part of xeus-octave.
+ * Distributed under the terms of the GNU General Public License v3.
  *
- * xeus-octave is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * xeus-octave is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with xeus-octave.  If not, see <http://www.gnu.org/licenses/>.
- */
+ * The full license is in the file LICENSE, distributed with this software.
+ ****************************************************************************/
 
-#ifndef XEUS_OCTAVE_PLOTSTREAM_H
-#define XEUS_OCTAVE_PLOTSTREAM_H
+#ifndef XEUS_OCTAVE_PLOTSTREAM_HPP
+#define XEUS_OCTAVE_PLOTSTREAM_HPP
 
 #include <octave/graphics.h>
 
+#include <xwidgets/ximage.hpp>
+
+namespace oc = octave;
+
 namespace xeus_octave
 {
 
-inline std::string getPlotStream(octave::graphics_object const& o)
+template <class T> inline T getPlotStream(oc::graphics_object const& o);
+
+/**
+ * Retrieve from the graphics object the plot_stream property
+ */
+template <> inline xw::image* getPlotStream<xw::image*>(oc::graphics_object const& o)
+{
+  octave_value ps =
+    dynamic_cast<oc::figure::properties const&>(o.get_ancestor("figure").get_properties()).get___plot_stream__();
+
+  if (ps.isnumeric() && ps.is_scalar_type())
+    return reinterpret_cast<xw::image*>(ps.long_value());
+  else
+    return nullptr;
+}
+
+/**
+ * Retrieve from the graphics object the plot_stream property
+ */
+template <> inline std::string getPlotStream<std::string>(oc::graphics_object const& o)
 {
-  return dynamic_cast<octave::figure::properties const&>(o.get_ancestor("figure").get_properties())
-    .get___plot_stream__()
-    .string_value();
+  octave_value ps =
+    dynamic_cast<oc::figure::properties const&>(o.get_ancestor("figure").get_properties()).get___plot_stream__();
+
+  if (ps.is_string())
+    return ps.string_value();
+  else
+    return "";
 }
 
-inline void setPlotStream(octave::graphics_object& o, std::string p)
+/**
+ * Set in the graphics object the plot_stream propert
+ */
+inline void setPlotStream(oc::graphics_object& o, xw::image* p)
 {
   if (o.isa("figure"))
-    dynamic_cast<octave::figure::properties&>(o.get_properties()).set___plot_stream__(p);
+  {
+    auto& fp = dynamic_cast<oc::figure::properties&>(o.get_properties());
+    fp.set___plot_stream__(reinterpret_cast<intptr_t>(p));
+  }
 }
 
-inline void setPlotStream(octave::graphics_object const& o, std::string p)
+/**
+ * Set in the graphics object the plot_stream propert
+ */
+inline void setPlotStream(oc::graphics_object& o, std::string p)
+{
+  if (o.isa("figure"))
+  {
+    auto& fp = dynamic_cast<oc::figure::properties&>(o.get_properties());
+    fp.set___plot_stream__(p);
+  }
+}
+
+/**
+ * Set in the graphics object the plot_stream propert (const version)
+ */
+inline void setPlotStream(oc::graphics_object const& o, xw::image* p)
+{
+  // deCONSTify the graphics_object
+  auto _go = o;
+  setPlotStream(_go, p);
+}
+
+/**
+ * Set in the graphics object the plot_stream propert (const version)
+ */
+inline void setPlotStream(oc::graphics_object const& o, std::string p)
 {
   // deCONSTify the graphics_object
   auto _go = o;
@@ -47,4 +94,4 @@ inline void setPlotStream(octave::graphics_object const& o, std::string p)
 
 }  // namespace xeus_octave
 
-#endif  // XEUS_OCTAVE_PLOTSTREAM_H
+#endif

include/xeus-octave/tk_notebook.hpp

@@ -22,26 +22,53 @@
 
 #include <octave/graphics-toolkit.h>
 #include <octave/interpreter.h>
+#include <vector>
 
 #include "xeus-octave/config.hpp"
 
 namespace xeus_octave::tk::notebook
 {
 
-class notebook_graphics_toolkit : public octave::base_graphics_toolkit
+class glfw_graphics_toolkit : public octave::base_graphics_toolkit
+{
+public:
+
+  glfw_graphics_toolkit(std::string const& nm);
+  ~glfw_graphics_toolkit();
+
+  bool initialize(octave::graphics_object const&) override;
+  void redraw_figure(octave::graphics_object const&) const override;
+  virtual void send_figure(
+    octave::graphics_object const& go, std::vector<char> const& img, int width, int height, double dpr
+  ) const = 0;
+};
+
+class notebook_graphics_toolkit : public glfw_graphics_toolkit
 {
 public:
 
   notebook_graphics_toolkit();
-  ~notebook_graphics_toolkit();
 
   bool is_valid() const override { return true; }
 
   bool initialize(octave::graphics_object const&) override;
-  void redraw_figure(octave::graphics_object const&) const override;
+  void send_figure(octave::graphics_object const& go, std::vector<char> const& img, int width, int height, double dpr)
+    const override;
   void show_figure(octave::graphics_object const&) const override;
-  void update(octave::graphics_object const&, int) override;
+};
+
+class widget_graphics_toolkit : public glfw_graphics_toolkit
+{
+public:
+
+  widget_graphics_toolkit();
 
+  bool is_valid() const override { return true; }
+
+  bool initialize(octave::graphics_object const&) override;
+  void send_figure(octave::graphics_object const& go, std::vector<char> const& img, int width, int height, double dpr)
+    const override;
+  void show_figure(octave::graphics_object const&) const override;
   void finalize(octave::graphics_object const&) override;
 };