From 93ae542b95b3708e49a75aaa6f81943819e95f7e Mon Sep 17 00:00:00 2001
From: Tavmjong Bah <tavmjong@free.fr>
Date: Fri, 15 Feb 2019 13:07:06 +0100
Subject: Turn InkscapeApplication into singleton.

---
 src/inkscape-application.cpp | 15 +++++++++++++++
 src/inkscape-application.h   |  3 +++
 src/inkscape-main.cpp        |  4 ++--
 src/inkscape-window.cpp      |  3 +++
 4 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/inkscape-application.cpp b/src/inkscape-application.cpp
index 0ebc93f82..cd88345ff 100644
--- a/src/inkscape-application.cpp
+++ b/src/inkscape-application.cpp
@@ -52,6 +52,11 @@ InkscapeApplication::InkscapeApplication()
     , _active_view(nullptr)
 {}
 
+/** Update windows in response to:
+ *  - New active window
+ *  - Document change
+ *  - Selection change
+ */
 void
 InkscapeApplication::update_windows(SPDocument* document)
 {
@@ -60,11 +65,21 @@ InkscapeApplication::update_windows(SPDocument* document)
     if (it != _documents.end()) {
         std::vector<InkscapeWindow*> windows = it->second;
         std::cout << "InkscapeApplication::update_windows: windows: " << windows.size() << std::endl;
+        // Loop over InkscapeWindows.
+        // Loop over DialogWindows. TBD
     } else {
         std::cout << "InkscapeApplication::update_windows: no windows found" << std::endl;
     }
 }
 
+template<class T>
+ConcreteInkscapeApplication<T>&
+ConcreteInkscapeApplication<T>::get_instance()
+{
+    static ConcreteInkscapeApplication<T> instance;
+    return instance;
+}
+
 template<class T>
 ConcreteInkscapeApplication<T>::ConcreteInkscapeApplication()
     : T("org.inkscape.application.with_gui",
diff --git a/src/inkscape-application.h b/src/inkscape-application.h
index 3b84770cf..d5b58d5cd 100644
--- a/src/inkscape-application.h
+++ b/src/inkscape-application.h
@@ -96,6 +96,9 @@ protected:
 template <class T> class ConcreteInkscapeApplication : public T, public InkscapeApplication
 {
 public:
+    static ConcreteInkscapeApplication<T>& get_instance();
+
+private:
     ConcreteInkscapeApplication();
 
 public:
diff --git a/src/inkscape-main.cpp b/src/inkscape-main.cpp
index d4fe68bb8..3e008558f 100644
--- a/src/inkscape-main.cpp
+++ b/src/inkscape-main.cpp
@@ -21,9 +21,9 @@ int main(int argc, char *argv[])
 {
 
     if (gtk_init_check(NULL, NULL))
-        return (new ConcreteInkscapeApplication<Gtk::Application>())->run(argc, argv);
+        return (ConcreteInkscapeApplication<Gtk::Application>::get_instance()).run(argc, argv);
     else
-        return (new ConcreteInkscapeApplication<Gio::Application>())->run(argc, argv);
+        return (ConcreteInkscapeApplication<Gio::Application>::get_instance()).run(argc, argv);
 }
 
 /*
diff --git a/src/inkscape-window.cpp b/src/inkscape-window.cpp
index 68a8db819..600b602d1 100644
--- a/src/inkscape-window.cpp
+++ b/src/inkscape-window.cpp
@@ -41,6 +41,9 @@ InkscapeWindow::InkscapeWindow(SPDocument* document)
         return;
     }
 
+    ConcreteInkscapeApplication<Gtk::Application>& my_app =
+    ConcreteInkscapeApplication<Gtk::Application>::get_instance();
+
     Glib::RefPtr<Gio::Application> gio_app = Gio::Application::get_default();
     Glib::RefPtr<Gtk::Application> gtk_app = Glib::RefPtr<Gtk::Application>::cast_dynamic(gio_app);
     _app = Glib::RefPtr<InkscapeApplication>::cast_dynamic(gtk_app);
-- 
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