MythTV: mythuistatetracker.cpp Source File

00001 #include <unistd.h>
00002 #include <QCoreApplication>
00003 #include "mythmainwindow.h"
00004 #include "mythevent.h"
00005 #include "mythuistatetracker.h"
00006 #include "mythuiactions.h"
00007 
00008 MythUIStateTracker* MythUIStateTracker::gUIState = NULL;
00009 QMutex* MythUIStateTracker::gUIStateLock = new QMutex();
00010 
00011 MythUIStateTracker* MythUIStateTracker::GetMythUIStateTracker(void)
00012 {
00013     gUIStateLock->lock();
00014     if (!gUIState)
00015         gUIState = new MythUIStateTracker();
00016     gUIStateLock->unlock();
00017     return gUIState;
00018 }
00019 
00020 void MythUIStateTracker::SetState(QVariantMap &newstate)
00021 {
00022     MythUIStateTracker* uistate = MythUIStateTracker::GetMythUIStateTracker();
00023     gUIStateLock->lock();
00024     uistate->m_state = newstate;
00025     uistate->m_state.detach();
00026     uistate->m_lastUpdated = QTime::currentTime();
00027     gUIStateLock->unlock();
00028 }
00029 
00030 void MythUIStateTracker::GetState(QVariantMap &state)
00031 {
00032     MythUIStateTracker* uistate = MythUIStateTracker::GetMythUIStateTracker();
00033     gUIStateLock->lock();
00034     state = uistate->m_state;
00035     state.detach();
00036     gUIStateLock->unlock();
00037 }
00038 
00039 void MythUIStateTracker::GetFreshState(QVariantMap &state)
00040 {
00041     if (MythUIStateTracker::TimeSinceLastUpdate() < 500)
00042     {
00043         MythUIStateTracker::GetState(state);
00044         return;
00045     }
00046 
00047     MythEvent *e = new MythEvent(ACTION_GETSTATUS);
00048     qApp->postEvent(GetMythMainWindow(), e);
00049 
00050     int tries = 0;
00051     while ((tries++ < 100) && (MythUIStateTracker::TimeSinceLastUpdate() >= 500))
00052         usleep(10000);
00053 
00054     MythUIStateTracker::GetState(state);
00055 }
00056 
00057 int MythUIStateTracker::TimeSinceLastUpdate(void)
00058 {
00059     MythUIStateTracker* state = MythUIStateTracker::GetMythUIStateTracker();
00060     gUIStateLock->lock();
00061     int age = state->m_lastUpdated.msecsTo(QTime::currentTime());
00062     gUIStateLock->unlock();
00063     return age < 0 ? 1000000 : age;
00064 }
00065