add last backwards-compatible version

foobar2000/SDK/threaded_process.h

@@ -2,28 +2,28 @@
 #include <functional>
 
 //! Callback class passed to your threaded_process client code; allows you to give various visual feedback to the user.
-class threaded_process_status {
+class NOVTABLE threaded_process_status {
 public:
 	enum {progress_min = 0, progress_max = 5000};
 	
 	//! Sets the primary progress bar state; scale from progress_min to progress_max.
-	virtual void set_progress(t_size p_state) {}
+	virtual void set_progress(t_size p_state) = 0;
 	//! Sets the secondary progress bar state; scale from progress_min to progress_max.
-	virtual void set_progress_secondary(t_size p_state) {}
+	virtual void set_progress_secondary(t_size p_state) = 0;
 	//! Sets the currently progressed item label. When working with files, you should use set_file_path() instead.
-	virtual void set_item(const char * p_item,t_size p_item_len = ~0) {}
+	virtual void set_item(const char * p_item,t_size p_item_len = ~0) = 0;
 	//! Sets the currently progressed item label; treats the label as a file path.
-	virtual void set_item_path(const char * p_item,t_size p_item_len = ~0) {}
+	virtual void set_item_path(const char * p_item,t_size p_item_len = ~0) = 0;
 	//! Sets the title of the dialog. You normally don't need this function unless you want to override the title you set when initializing the threaded_process.
-	virtual void set_title(const char * p_title,t_size p_title_len = ~0) {}
+	virtual void set_title(const char * p_title,t_size p_title_len = ~0) = 0;
 	//! Should not be used.
-	virtual void force_update() {}
+	virtual void force_update() = 0;
 	//! Returns whether the process is paused.
-	virtual bool is_paused() {return false;}
+	virtual bool is_paused() = 0;
 	
 	//! Checks if process is paused and sleeps if needed; returns false when process should be aborted, true on success. \n
 	//! You should use poll_pause() instead of calling this directly.
-	virtual bool process_pause() {return true;}
+	virtual bool process_pause() = 0;
 
 	//! Automatically sleeps if the process is paused.
 	void poll_pause() {if (!process_pause()) throw exception_aborted();}
@@ -39,12 +39,9 @@ public:
 	//! Helper; gracefully reports multiple items being concurrently worked on.
 	void set_items( metadb_handle_list_cref items );
 	void set_items( pfc::list_base_const_t<const char*> const & paths );
-};
-
-//! Fb2k mobile compatibility
-class threaded_process_context {
-public:
-	static HWND g_default() { return core_api::get_main_window(); }
+protected:
+	threaded_process_status() {}
+	~threaded_process_status() {}
 };
 
 //! Callback class for the threaded_process API. You must implement this to create your own threaded_process client.