public void GetDefaultBGColour(MHColour colour)
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.BGColour.IsSet())
{
colour.Copy(pApp.BGColour);
}
else
{
colour.SetFromString("\u0000\u0000\u0000\u00FF"); // '=00=00=00=FF' Default - transparent
}
}
public void GetDefaultTextColour(MHColour colour)
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.TextColour.IsSet())
{
colour.Copy(pApp.TextColour);
}
else
{
colour.SetFromString("\u00FF\u00FF\u00FF\u0000"); // '=FF=FF=FF=00' UK MHEG Default - white
}
}
// void GetDefaultFont(MHFontBody &font); // Not currently implemented
public void GetDefaultFontAttrs(MHOctetString str)
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.FontAttrs.Size > 0)
{
str.Copy(pApp.FontAttrs);
}
else
{
str.Copy("plain.24.24.0"); // TODO: Check this.
}
}
// Get the various defaults. These are extracted from the current app or the (UK) MHEG defaults.
public int GetDefaultCharSet()
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.CharSet > 0)
{
return(pApp.CharSet);
}
else
{
return(10); // UK MHEG default.
}
}
public int GetDefaultBitmapCHook()
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.BitmapCHook > 0)
{
return(pApp.BitmapCHook);
}
else
{
return(4); // UK MHEG default - PNG bitmap
}
}
public int GetDefaultStreamCHook()
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.StrCHook > 0)
{
return(pApp.StrCHook);
}
else
{
return(10); // UK MHEG default.
}
}
public void GetDefaultButtonRefColour(MHColour colour)
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.ButtonRefColour.IsSet())
{
colour.Copy(pApp.ButtonRefColour);
}
else
{
colour.SetFromString("\u00FF\u00FF\u00FF\u0000"); // '=FF=FF=FF=00' ??? Not specified in UK MHEG
}
}
protected MHGroup ParseProgram(byte[] text)
{
if (text.Length == 0)
{
return(null);
}
IMHParser parser = null;
MHParseNode pTree = null;
MHGroup pRes = null;
// Look at the first byte to decide whether this is text or binary. Binary
// files will begin with 0xA0 or 0xA1, text files with white space, comment ('/')
// or curly bracket.
// This is only there for testing: all downloaded objects will be in ASN1
byte ch = text[0];
if (ch >= 128)
{
parser = new MHParseBinary(text);
}
else
{
parser = new MHParseText(text);
}
// Parse the binary or text.
pTree = parser.Parse();
switch (pTree.GetTagNo())
{ // The parse node should be a tagged item.
case ASN1Codes.C_APPLICATION: pRes = new MHApplication(); break;
case ASN1Codes.C_SCENE: pRes = new MHScene(); break;
default: pTree.Failure("Expected Application or Scene"); break; // throws exception.
}
pRes.Initialise(pTree, this); // Convert the parse tree.
return(pRes);
}
public void PrintCurrentApp(TextWriter writer)
{
MHApplication application = CurrentApp();
application.Print(writer, 0);
}
public bool Launch(MHObjectRef target, bool fIsSpawn)
{
string csPath = GetPathName(target.GroupId); // Get path relative to root.
if (csPath.Length == 0)
{
return(false); // No file name.
}
if (m_fInTransition)
{
Logging.Log(Logging.MHLogWarning, "Launch during transition - ignoring");
return(false);
}
// Check that the file exists before we commit to the transition.
// This may block if we cannot be sure whether the object is present.
byte[] text;
if (!m_Context.GetCarouselData(csPath, out text))
{
return(false);
}
m_fInTransition = true; // Starting a transition
try
{
if (CurrentApp() != null)
{
if (fIsSpawn)
{
// Run the CloseDown actions.
AddActions(CurrentApp().CloseDown);
RunActions();
}
if (CurrentScene() != null)
{
CurrentScene().Destruction(this);
}
CurrentApp().Destruction(this);
if (!fIsSpawn)
{
m_ApplicationStack.Pop(); // Pop and delete the current app.
}
}
MHApplication pProgram = (MHApplication)ParseProgram(text);
if ((Logging.GetLoggingLevel() & Logging.MHLogScenes) != 0) // Print it so we know what's going on.
{
pProgram.Print(Logging.GetLoggingStream(), 0);
}
if (!pProgram.IsApp)
{
throw new MHEGException("Expected an application");
}
// Save the path we use for this app.
pProgram.Path = csPath; // Record the path
int nPos = pProgram.Path.LastIndexOf('/');
if (nPos < 0)
{
pProgram.Path = "";
}
else
{
pProgram.Path = pProgram.Path.Substring(0, nPos);
}
// Have now got the application.
m_ApplicationStack.Push(pProgram);
// This isn't in the standard as far as I can tell but we have to do this because
// we may have events referring to the old application.
m_EventQueue.Clear();
// Activate the application. ....
CurrentApp().Activation(this);
m_fInTransition = false; // The transition is complete
return(true);
}
catch (MHEGException)
{
m_fInTransition = false; // The transition is complete
return(false);
}
}
public void TransitionToScene(MHObjectRef target)
{
int i;
if (m_fInTransition)
{
// TransitionTo is not allowed in OnStartUp or OnCloseDown actions.
Logging.Log(Logging.MHLogWarning, "TransitionTo during transition - ignoring");
return;
}
if (target.GroupId.Size == 0)
{
return; // No file name.
}
string csPath = GetPathName(target.GroupId);
// Check that the file exists before we commit to the transition.
byte[] text;
if (!m_Context.GetCarouselData(csPath, out text))
{
return;
}
// Parse and run the file.
MHGroup pProgram = ParseProgram(text);
if (pProgram.IsApp)
{
throw new MHEGException("Expected a scene");
}
// Clear the action queue of anything pending.
m_ActionStack.Clear();
// At this point we have managed to load the scene.
// Deactivate any non-shared ingredients in the application.
MHApplication pApp = CurrentApp();
for (i = pApp.Items.Size; i > 0; i--)
{
MHIngredient pItem = pApp.Items.GetAt(i - 1);
if (!pItem.IsShared())
{
pItem.Deactivation(this); // This does not remove them from the display stack.
}
}
m_fInTransition = true; // TransitionTo etc are not allowed.
if (pApp.CurrentScene != null)
{
pApp.CurrentScene.Deactivation(this); // This may involve a call to RunActions
pApp.CurrentScene.Destruction(this);
}
// Everything that belongs to the previous scene should have been removed from the display stack.
// At this point we may have added actions to the queue as a result of synchronous
// events during the deactivation.
// Remove any events from the asynch event queue unless they derive from
// the application itself or a shared ingredient.
List <MHAsynchEvent> removeEvents = new List <MHAsynchEvent>();
foreach (MHAsynchEvent e in m_EventQueue)
{
if (!e.EventSource.IsShared())
{
removeEvents.Add(e);
}
}
foreach (MHAsynchEvent e in removeEvents)
{
m_EventQueue.Remove(e);
}
// Can now actually delete the old scene.
if (pApp.CurrentScene != null)
{
pApp.CurrentScene = null;
}
// Switch to the new scene.
CurrentApp().CurrentScene = (MHScene)pProgram;
SetInputRegister(CurrentScene().EventReg);
m_redrawRegion = new Region(new Rectangle(0, 0, CurrentScene().SceneCoordX, CurrentScene().SceneCoordY)); // Redraw the whole screen
if ((Logging.GetLoggingLevel() & Logging.MHLogScenes) != 0)
{ // Print it so we know what's going on.
pProgram.Print(Logging.GetLoggingStream(), 0);
}
pProgram.Preparation(this);
pProgram.Activation(this);
m_fInTransition = false; // The transition is complete
}
