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App.cc

// App.cc
// Copyright (c) 2002 Henrik Kinnunen (fluxgen at linuxmail.org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

#include "App.hh"

#include "EventManager.hh"

#include <cassert>
#include <string>
// According to POSIX 1003.1-2001
#include <sys/select.h>

// According to earlier standards
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

namespace FbTk {

App *App::s_app = 0;

00040 App *App::instance() {
    if (s_app == 0)
        throw std::string("You must create an instance of FbTk::App first!");
    return s_app;
}

App::App(const char *displayname):m_done(false) {
    if (s_app != 0)
        throw std::string("Can't create more than one instance of FbTk::App");
    s_app = this;
    m_display = XOpenDisplay(displayname);
}

App::~App() {
    if (m_display != 0) {
        XCloseDisplay(m_display);
        m_display = 0;
    }
    s_app = 0;
}

00061 void App::eventLoop() {
    
    // set timeout
    struct timeval tv;  
      
    fd_set readfds;     
    int con_num = ConnectionNumber(display());
    XEvent event;
    while (!m_done) { // while application don't want to quit
        // set timeout and wait for display connection to send an event signal
        // so we don't take up much cpu time
        tv.tv_sec = 0;
        tv.tv_usec = 1;
        select(con_num+1, &readfds, 0, 0, &tv);
        FD_ZERO(&readfds);
        FD_SET(con_num, &readfds);
            
        if (FD_ISSET(con_num, &readfds) && XPending(display())) {
            XNextEvent(display(), &event); // get next event
            FbTk::EventManager::instance()->handleEvent(event);   // handle event
        }
    }
}


00086 void App::end() {
    m_done = true; //end loop in App::eventLoop
}

}; // end namespace FbTk

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