added window close listener (#28)

Author: johnpatek

example/main.cpp

@@ -4,6 +4,8 @@
 
 #include <yyjson.h>
 
+#include <thread>
+
 static std::string get_archive_path()
 {
     std::string result(ARCHIVE_DIRECTORY);
@@ -80,6 +82,16 @@ class greeting_ipc_handler : public webframe::handler
     }
 };
 
+class window_listener : public webframe::window_listener
+{
+public:
+    void on_close(webframe::window *source) override
+    {
+        source->set_title("Goodbye!");
+        std::this_thread::sleep_for(std::chrono::milliseconds(200));
+    }
+};
+
 class example_application : public webframe::application
 {
 public:
@@ -95,8 +107,10 @@ class example_application : public webframe::application
         webframe::window *win = context->create_window(nullptr, 800, 600);
         win->set_title("WebFrame Example");
         win->load_path("index.html");
+        win->add_listener(&_window_listener);
     }
 private:
+    window_listener _window_listener;
     archive_handler _archive_handler;
     greeting_ipc_handler _greeting_ipc_handler;
 };

include/webframe/context.hpp

@@ -32,12 +32,23 @@
 
 namespace webframe
 {
+    class window;
+
+    class window_listener
+    {
+    public:
+        virtual void on_close(window *source) = 0;
+    };
+
     class window
     {
     public:
         virtual void set_title(const std::string& title) = 0;
         virtual void load_url(const std::string& url) = 0;
         virtual void load_path(const std::string& path) = 0;
+        
+        virtual void add_listener(window_listener *listener) = 0;
+        
         virtual std::string get_id() const = 0;
     };
 

src/runtimes/desktop/include/desktop/window.hpp

@@ -13,14 +13,19 @@ namespace webframe::desktop
 
         void load_path(const std::string &path) override;
         void load_url(const std::string &url) override;
-
         std::string get_id() const override;
+
         wxFrame *get_frame() const;
 
+        void add_listener(window_listener *listener) override;
+
         void set_title(const std::string &title) override;
 
     private:
+        void on_close(wxCloseEvent &event);
+
         std::unique_ptr<wxFrame> _frame;
+        std::vector<window_listener*> _listeners;
         wxWebView *_webview;
         struct webview_data
         {

src/runtimes/desktop/window.cpp

@@ -19,6 +19,7 @@ namespace webframe::desktop
                 }
                 _webview_data.created = true;
             });
+        _frame->Bind(wxEVT_CLOSE_WINDOW, &window::on_close, this);
         _frame->Show();
     }
 
@@ -46,11 +47,25 @@ namespace webframe::desktop
         return std::to_string(_frame->GetId());
     }
 
+    void window::add_listener(window_listener *listener)
+    {
+        _listeners.push_back(listener);
+    }
+
     wxFrame *window::get_frame() const
     {
         return _frame.get();
     }
 
+    void window::on_close(wxCloseEvent &event)
+    {
+        for (window_listener *listener : _listeners)
+        {
+            listener->on_close(this);
+        }
+        event.Skip();
+    }
+
     void window::set_title(const std::string &title)
     {
         wxString wx_title = wxString(title.c_str());