protected void CheckLinks(MHObjectRef sourceRef, int eventType, MHUnion un)
{
for (int i = 0; i < (int)m_LinkTable.Count; i++)
{
m_LinkTable[i].MatchEvent(sourceRef, eventType, un, this);
}
}
// Return the value, looking up any indirect ref.
public void GetValue(MHOctetString str, MHEngine engine)
{
if (m_fIsDirect)
{
str.Copy(m_Direct);
}
else
{
MHUnion result = new MHUnion();
MHRoot pBase = engine.FindObject(m_Indirect);
pBase.GetVariableValue(result, engine);
// From my reading of the MHEG documents implicit conversion is only
// performed when assigning variables. Nevertheless the Channel 4
// Teletext assumes that implicit conversion takes place here as well.
if (result.Type == MHUnion.U_Int)
{
// Implicit conversion of string to integer.
MHOctetString s = new MHOctetString("" + result.Int);
str.Copy(s);
}
else
{
result.CheckType(MHUnion.U_String);
str.Copy(result.String);
}
}
}
// Return the value, looking up any indirect ref.
public int GetValue(MHEngine engine)
{
if (m_fIsDirect)
{
return(m_nDirect);
}
else
{
MHUnion result = new MHUnion();
MHRoot pBase = engine.FindObject(m_Indirect);
pBase.GetVariableValue(result, engine);
// From my reading of the MHEG documents implicit conversion is only
// performed when assigning variables. Nevertheless the Channel 4
// Teletext assumes that implicit conversion takes place here as well.
if (result.Type == MHUnion.U_String)
{
// Implicit conversion of string to integer.
return(Convert.ToInt32(result.String.ToString()));
}
else
{
result.CheckType(MHUnion.U_Int);
return(result.Int);
}
}
}
public void EventTriggered(MHRoot pSource, int ev, MHUnion evData)
{
Logging.Log(Logging.MHLogLinks, "Event - " + MHLink.EventTypeToString(ev) + " from " + pSource.ObjectIdentifier.Printable());
switch (ev)
{
case MHRoot.EventFirstItemPresented:
case MHRoot.EventHeadItems:
case MHRoot.EventHighlightOff:
case MHRoot.EventHighlightOn:
case MHRoot.EventIsAvailable:
case MHRoot.EventIsDeleted:
case MHRoot.EventIsDeselected:
case MHRoot.EventIsRunning:
case MHRoot.EventIsSelected:
case MHRoot.EventIsStopped:
case MHRoot.EventItemDeselected:
case MHRoot.EventItemSelected:
case MHRoot.EventLastItemPresented:
case MHRoot.EventTailItems:
case MHRoot.EventTestEvent:
case MHRoot.EventTokenMovedFrom:
case MHRoot.EventTokenMovedTo:
// Synchronous events. Fire any links that are waiting.
// The UK MHEG describes this as the preferred interpretation. We are checking the link
// at the time we generate the event rather than queuing the synchronous events until
// this elementary action is complete. That matters if we are processing an elementary action
// which will activate or deactivate links.
CheckLinks(pSource.ObjectIdentifier, ev, evData);
break;
case MHRoot.EventAnchorFired:
case MHRoot.EventAsyncStopped:
case MHRoot.EventContentAvailable:
case MHRoot.EventCounterTrigger:
case MHRoot.EventCursorEnter:
case MHRoot.EventCursorLeave:
case MHRoot.EventEngineEvent:
case MHRoot.EventEntryFieldFull:
case MHRoot.EventInteractionCompleted:
case MHRoot.EventStreamEvent:
case MHRoot.EventStreamPlaying:
case MHRoot.EventStreamStopped:
case MHRoot.EventTimerFired:
case MHRoot.EventUserInput:
case MHRoot.EventFocusMoved: // UK MHEG. Generated by HyperText class
case MHRoot.EventSliderValueChanged: // UK MHEG. Generated by Slider class
{
// Asynchronous events. Add to the event queue.
MHAsynchEvent pEvent = new MHAsynchEvent();
pEvent.EventSource = pSource;
pEvent.EventType = ev;
pEvent.EventData = evData;
m_EventQueue.Add(pEvent);
} break;
}
}
// Return the value, looking up any indirect ref.
public void GetValue(MHContentRef reference, MHEngine engine)
{
if (m_fIsDirect)
{
reference.Copy(m_Direct);
}
else
{
MHUnion result = new MHUnion();
MHRoot pBase = engine.FindObject(m_Indirect);
pBase.GetVariableValue(result, engine);
result.CheckType(MHUnion.U_ContentRef);
reference.Copy(result.ContentRef);
}
}
// Return the value, looking up any indirect ref.
public bool GetValue(MHEngine engine)
{
if (m_fIsDirect)
{
return(m_fDirect);
}
else
{
MHUnion result = new MHUnion();
MHRoot pBase = engine.FindObject(m_Indirect);
pBase.GetVariableValue(result, engine);
result.CheckType(MHUnion.U_Bool);
return(result.Bool);
}
}
public virtual void SetVariableValue(MHUnion value)
{
InvalidAction("SetVariableValue");
}
public virtual void GetVariableValue(MHUnion value, MHEngine engine)
{
InvalidAction("GetVariableValue");
}
// Actions on variables.
public virtual void TestVariable(int nOp, MHUnion parm, MHEngine engine)
{
InvalidAction("TestVariable");
}
