108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
/*
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Copyright (C) 2000-2009 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __pbd_base_ui_h__
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#define __pbd_base_ui_h__
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#include <string>
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#include <stdint.h>
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#include <sigc++/slot.h>
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#include <sigc++/trackable.h>
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#include <glibmm/thread.h>
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#include <glibmm/main.h>
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#include "pbd/crossthread.h"
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#include "pbd/event_loop.h"
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/** A BaseUI is an abstraction designed to be used with any "user
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* interface" (not necessarily graphical) that needs to wait on
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* events/requests and dispatch/process them as they arrive.
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*
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* This implementation starts up a thread that runs a Glib main loop
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* to wait on events/requests etc.
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*/
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class BaseUI : virtual public sigc::trackable, public PBD::EventLoop
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{
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public:
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BaseUI (const std::string& name);
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virtual ~BaseUI();
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BaseUI* base_instance() { return base_ui_instance; }
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Glib::RefPtr<Glib::MainLoop> main_loop() const { return _main_loop; }
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Glib::Thread* event_loop_thread() const { return run_loop_thread; }
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bool caller_is_self () const { return Glib::Thread::self() == run_loop_thread; }
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std::string name() const { return _name; }
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bool ok() const { return _ok; }
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static RequestType new_request_type();
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static RequestType CallSlot;
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static RequestType Quit;
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/** start up a thread to run the main loop
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*/
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void run ();
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/** stop the thread running the main loop (and block
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* until it exits)
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*/
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void quit ();
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protected:
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CrossThreadChannel request_channel;
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bool _ok;
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Glib::RefPtr<Glib::MainLoop> _main_loop;
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Glib::Thread* run_loop_thread;
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/** Derived UI objects can implement thread_init()
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* which will be called by the event loop thread
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* immediately before it enters the event loop.
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*/
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virtual void thread_init () {};
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/** Called when there input ready on the request_channel
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*/
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bool request_handler (Glib::IOCondition);
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/** Derived UI objects must implement this method,
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* which will be called whenever there are requests
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* to be dealt with.
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*/
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virtual void handle_ui_requests () = 0;
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private:
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std::string _name;
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BaseUI* base_ui_instance;
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static uint64_t rt_bit;
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int setup_request_pipe ();
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void main_thread ();
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};
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#endif /* __pbd_base_ui_h__ */
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