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vtkObject.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkObject.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkObject.h"
#include "vtkCommand.h"
#include "vtkDebugLeaks.h"
#include "vtkGarbageCollector.h"
#include "vtkObjectFactory.h"
#include "vtkTimeStamp.h"
#include "vtkWeakPointer.h"
#include <algorithm>
#include <vector>
// Initialize static member that controls warning display
static int vtkObjectGlobalWarningDisplay = 1;
//----------------------------------------------------------------------------
// avoid dll boundary problems
#ifdef _WIN32
void* vtkObject::operator new(size_t nSize)
{
void* p=malloc(nSize);
return p;
}
//----------------------------------------------------------------------------
void vtkObject::operator delete( void *p )
{
free(p);
}
#endif
//----------------------------------------------------------------------------
void vtkObject::SetGlobalWarningDisplay(int val)
{
vtkObjectGlobalWarningDisplay = val;
}
//----------------------------------------------------------------------------
int vtkObject::GetGlobalWarningDisplay()
{
return vtkObjectGlobalWarningDisplay;
}
//----------------------------------Command/Observer stuff-------------------
// The Command/Observer design pattern is used to invoke and dispatch events.
// The class vtkSubjectHelper keeps a list of observers (which in turn keep
// an instance of vtkCommand) which respond to registered events.
//
class vtkObserver
{
public:
vtkObserver():Command(0),Event(0),Tag(0),Next(0),Priority(0.0) {}
~vtkObserver();
void PrintSelf(ostream& os, vtkIndent indent);
vtkCommand *Command;
unsigned long Event;
unsigned long Tag;
vtkObserver *Next;
float Priority;
};
void vtkObserver::PrintSelf(ostream& os, vtkIndent indent)
{
os << indent << "vtkObserver (" << this << ")\n";
indent = indent.GetNextIndent();
os << indent << "Event: " << this->Event << "\n";
os << indent << "EventName: " << vtkCommand::GetStringFromEventId(this->Event) << "\n";
os << indent << "Command: " << this->Command << "\n";
os << indent << "Priority: " << this->Priority << "\n";
os << indent << "Tag: " << this->Tag << "\n";
}
//----------------------------------------------------------------------------
// The vtkSubjectHelper keeps a list of observers and dispatches events to them.
// It also invokes the vtkCommands associated with the observers. Currently
// vtkSubjectHelper is an internal class to vtkObject. However, due to requirements
// from the VTK widgets it may be necessary to break out the vtkSubjectHelper at
// some point (for reasons of event management, etc.)
class vtkSubjectHelper
{
public:
vtkSubjectHelper():ListModified(0),Focus1(0),Focus2(0),Start(0),Count(1) {}
~vtkSubjectHelper();
unsigned long AddObserver(unsigned long event, vtkCommand *cmd, float p);
void RemoveObserver(unsigned long tag);
void RemoveObservers(unsigned long event);
void RemoveObservers(unsigned long event, vtkCommand *cmd);
void RemoveAllObservers();
int InvokeEvent(unsigned long event, void *callData, vtkObject *self);
vtkCommand *GetCommand(unsigned long tag);
unsigned long GetTag(vtkCommand*);
int HasObserver(unsigned long event);
int HasObserver(unsigned long event, vtkCommand *cmd);
void GrabFocus(vtkCommand *c1, vtkCommand *c2) {this->Focus1 = c1; this->Focus2 = c2;}
void ReleaseFocus() {this->Focus1 = NULL; this->Focus2 = NULL;}
void PrintSelf(ostream& os, vtkIndent indent);
int ListModified;
// This is to support the GrabFocus() methods found in vtkInteractorObserver.
vtkCommand *Focus1;
vtkCommand *Focus2;
protected:
vtkObserver *Start;
unsigned long Count;
};
// ------------------------------------vtkObject----------------------
vtkObject *vtkObject::New()
{
vtkObject *ret = new vtkObject;
ret->InitializeObjectBase();
return ret;
}
//----------------------------------------------------------------------------
// Create an object with Debug turned off and modified time initialized
// to zero.
vtkObject::vtkObject()
{
this->Debug = false;
this->SubjectHelper = NULL;
this->Modified(); // Insures modified time > than any other time
// initial reference count = 1 and reference counting on.
}
//----------------------------------------------------------------------------
vtkObject::~vtkObject()
{
vtkDebugMacro(<< "Destructing!");
// warn user if reference counting is on and the object is being referenced
// by another object
if ( this->ReferenceCount > 0)
{
vtkErrorMacro(<< "Trying to delete object with non-zero reference count.");
}
delete this->SubjectHelper;
this->SubjectHelper = NULL;
}
//----------------------------------------------------------------------------
// Return the modification for this object.
vtkMTimeType vtkObject::GetMTime()
{
return this->MTime.GetMTime();
}
// Chaining method to print an object's instance variables, as well as
// its superclasses.
void vtkObject::PrintSelf(ostream& os, vtkIndent indent)
{
os << indent << "Debug: " << (this->Debug ? "On\n" : "Off\n");
os << indent << "Modified Time: " << this->GetMTime() << "\n";
this->Superclass::PrintSelf(os, indent);
os << indent << "Registered Events: ";
if ( this->SubjectHelper )
{
os << endl;
this->SubjectHelper->PrintSelf(os,indent.GetNextIndent());
}
else
{
os << "(none)\n";
}
}
//----------------------------------------------------------------------------
// Turn debugging output on.
// The Modified() method is purposely not called since we do not want to affect
// the modification time when enabling debug output.
void vtkObject::DebugOn()
{
this->Debug = true;
}
//----------------------------------------------------------------------------
// Turn debugging output off.
void vtkObject::DebugOff()
{
this->Debug = false;
}
//----------------------------------------------------------------------------
// Get the value of the debug flag.
bool vtkObject::GetDebug()
{
return this->Debug;
}
//----------------------------------------------------------------------------
// Set the value of the debug flag. A true value turns debugging on.
void vtkObject::SetDebug(bool debugFlag)
{
this->Debug = debugFlag;
}
//----------------------------------------------------------------------------
// This method is called when vtkErrorMacro executes. It allows
// the debugger to break on error.
void vtkObject::BreakOnError()
{
}
//----------------------------------Command/Observer stuff-------------------
//
//----------------------------------------------------------------------------
vtkObserver::~vtkObserver()
{
this->Command->UnRegister(0);
}
//----------------------------------------------------------------------------
vtkSubjectHelper::~vtkSubjectHelper()
{
vtkObserver *elem = this->Start;
vtkObserver *next;
while (elem)
{
next = elem->Next;
delete elem;
elem = next;
}
this->Start = NULL;
this->Focus1 = NULL;
this->Focus2 = NULL;
}
//----------------------------------------------------------------------------
unsigned long vtkSubjectHelper::
AddObserver(unsigned long event, vtkCommand *cmd, float p)
{
vtkObserver *elem;
// initialize the new observer element
elem = new vtkObserver;
elem->Priority = p;
elem->Next = NULL;
elem->Event = event;
elem->Command = cmd;
cmd->Register(0);
elem->Tag = this->Count;
this->Count++;
// now insert into the list
// if no other elements in the list then this is Start
if (!this->Start)
{
this->Start = elem;
}
else
{
// insert high priority first
vtkObserver* prev = 0;
vtkObserver* pos = this->Start;
while(pos->Priority >= elem->Priority && pos->Next)
{
prev = pos;
pos = pos->Next;
}
// pos is Start and elem should not be start
if(pos->Priority > elem->Priority)
{
pos->Next = elem;
}
else
{
if(prev)
{
prev->Next = elem;
}
elem->Next = pos;
// check to see if the new element is the start
if(pos == this->Start)
{
this->Start = elem;
}
}
}
return elem->Tag;
}
//----------------------------------------------------------------------------
void vtkSubjectHelper::RemoveObserver(unsigned long tag)
{
vtkObserver *elem;
vtkObserver *prev;
vtkObserver *next;
elem = this->Start;
prev = NULL;
while (elem)
{
if (elem->Tag == tag)
{
if (prev)
{
prev->Next = elem->Next;
next = prev->Next;
}
else
{
this->Start = elem->Next;
next = this->Start;
}
delete elem;
elem = next;
}
else
{
prev = elem;
elem = elem->Next;
}
}
this->ListModified = 1;
}
//----------------------------------------------------------------------------
void vtkSubjectHelper::RemoveObservers(unsigned long event)
{
vtkObserver *elem;
vtkObserver *prev;
vtkObserver *next;
elem = this->Start;
prev = NULL;
while (elem)
{
if (elem->Event == event)
{
if (prev)
{
prev->Next = elem->Next;
next = prev->Next;
}
else
{
this->Start = elem->Next;
next = this->Start;
}
delete elem;
elem = next;
}
else
{
prev = elem;
elem = elem->Next;
}
}
this->ListModified = 1;
}
//----------------------------------------------------------------------------
void vtkSubjectHelper::RemoveObservers(unsigned long event, vtkCommand *cmd)
{
vtkObserver *elem;
vtkObserver *prev;
vtkObserver *next;
elem = this->Start;
prev = NULL;
while (elem)
{
if (elem->Event == event && elem->Command == cmd)
{
if (prev)
{
prev->Next = elem->Next;
next = prev->Next;
}
else
{
this->Start = elem->Next;
next = this->Start;
}
delete elem;
elem = next;
}
else
{
prev = elem;
elem = elem->Next;
}
}
this->ListModified = 1;
}
//----------------------------------------------------------------------------
void vtkSubjectHelper::RemoveAllObservers()
{
vtkObserver *elem = this->Start;
vtkObserver *next;
while (elem)
{
next = elem->Next;
delete elem;
elem = next;
}
this->Start = NULL;
}
//----------------------------------------------------------------------------
int vtkSubjectHelper::HasObserver(unsigned long event)
{
vtkObserver *elem = this->Start;
while (elem)
{
if (elem->Event == event || elem->Event == vtkCommand::AnyEvent)
{
return 1;
}
elem = elem->Next;
}
return 0;
}
//----------------------------------------------------------------------------
int vtkSubjectHelper::HasObserver(unsigned long event, vtkCommand *cmd)
{
vtkObserver *elem = this->Start;
while (elem)
{
if ((elem->Event == event || elem->Event == vtkCommand::AnyEvent) &&
elem->Command == cmd)
{
return 1;
}
elem = elem->Next;
}
return 0;
}
//----------------------------------------------------------------------------
int vtkSubjectHelper::InvokeEvent(unsigned long event, void *callData,
vtkObject *self)
{
int focusHandled = 0;
// When we invoke an event, the observer may add or remove observers. To make
// sure that the iteration over the observers goes smoothly, we capture any
// change to the list with the ListModified ivar. However, an observer may
// also do something that causes another event to be invoked in this object.
// That means that this method will be called recursively, which means that we
// will obliterate the ListModified flag that the first call is relying on.
// To get around this, save the previous ListModified value on the stack and
// then restore it before leaving.
int saveListModified = this->ListModified;
this->ListModified = 0;
// We also need to save what observers we have called on the stack (lest it
// get overridden in the event invocation). Also make sure that we do not
// invoke any new observers that were added during another observer's
// invocation.
typedef std::vector<unsigned long> VisitedListType;
VisitedListType visited;
vtkObserver *elem = this->Start;
// If an element with a tag greater than maxTag is found, that means it has
// been added after InvokeEvent is called (as a side effect of calling an
// element command. In that case, the element is discarded and not executed.
const unsigned long maxTag = this->Count;
// Loop two or three times, giving preference to passive observers
// and focus holders, if any.
//
// 0. Passive observer loop
// Loop over all observers and execute those that are passive observers.
// These observers should not affect the state of the system in any way,
// and should not be allowed to abort the event.
//
// 1. Focus loop
// If there is a focus holder, loop over all observers and execute
// those associated with either focus holder. Set focusHandled to
// indicate that a focus holder handled the event.
//
// 2. Remainder loop
// If no focus holder handled the event already, loop over the
// remaining observers. This loop will always get executed when there
// is no focus holder.
// 0. Passive observer loop
//
vtkObserver *next;
while (elem)
{
// store the next pointer because elem could disappear due to Command
next = elem->Next;
if (elem->Command->GetPassiveObserver() &&
(elem->Event == event || elem->Event == vtkCommand::AnyEvent) &&
elem->Tag < maxTag)
{
VisitedListType::iterator vIter =
std::lower_bound(visited.begin(), visited.end(), elem->Tag);
if (vIter == visited.end() || *vIter != elem->Tag)
{
// Sorted insertion by tag to speed-up future searches at limited
// insertion cost because it reuses the search iterator already at the
// correct location
visited.insert(vIter, elem->Tag);
vtkCommand* command = elem->Command;
command->Register(command);
elem->Command->Execute(self,event,callData);
command->UnRegister();
}
}
if (this->ListModified)
{
vtkGenericWarningMacro(<<"Passive observer should not call AddObserver or RemoveObserver in callback.");
elem = this->Start;
this->ListModified = 0;
}
else
{
elem = next;
}
}
// 1. Focus loop
//
if (this->Focus1 || this->Focus2)
{
elem = this->Start;
while (elem)
{
// store the next pointer because elem could disappear due to Command
next = elem->Next;
if (((this->Focus1 == elem->Command) || (this->Focus2 == elem->Command)) &&
(elem->Event == event || elem->Event == vtkCommand::AnyEvent) &&
elem->Tag < maxTag)
{
VisitedListType::iterator vIter =
std::lower_bound(visited.begin(), visited.end(), elem->Tag);
if (vIter == visited.end() || *vIter != elem->Tag)
{
// Don't execute the remainder loop
focusHandled = 1;
// Sorted insertion by tag to speed-up future searches at limited
// insertion cost because it reuses the search iterator already at the
// correct location
visited.insert(vIter, elem->Tag);
vtkCommand* command = elem->Command;
command->Register(command);
command->SetAbortFlag(0);
elem->Command->Execute(self,event,callData);
// if the command set the abort flag, then stop firing events
// and return
if(command->GetAbortFlag())
{
command->UnRegister();
this->ListModified = saveListModified;
return 1;
}
command->UnRegister();
}
}
if (this->ListModified)
{
elem = this->Start;
this->ListModified = 0;
}
else
{
elem = next;
}
}
}
// 2. Remainder loop
//
if (!focusHandled)
{
elem = this->Start;
while (elem)
{
// store the next pointer because elem could disappear due to Command
next = elem->Next;
if ((elem->Event == event || elem->Event == vtkCommand::AnyEvent) &&
elem->Tag < maxTag)
{
VisitedListType::iterator vIter =
std::lower_bound(visited.begin(), visited.end(), elem->Tag);
if (vIter == visited.end() || *vIter != elem->Tag)
{
// Sorted insertion by tag to speed-up future searches at limited
// insertion cost because it reuses the search iterator already at the
// correct location
visited.insert(vIter, elem->Tag);
vtkCommand* command = elem->Command;
command->Register(command);
command->SetAbortFlag(0);
elem->Command->Execute(self,event,callData);
// if the command set the abort flag, then stop firing events
// and return
if(command->GetAbortFlag())
{
command->UnRegister();
this->ListModified = saveListModified;
return 1;
}
command->UnRegister();
}
}
if (this->ListModified)
{
elem = this->Start;
this->ListModified = 0;
}
else
{
elem = next;
}
}
}
this->ListModified = saveListModified;
return 0;
}
//----------------------------------------------------------------------------
unsigned long vtkSubjectHelper::GetTag(vtkCommand* cmd)
{
vtkObserver *elem = this->Start;
while (elem)
{
if (elem->Command == cmd)
{
return elem->Tag;
}
elem = elem->Next;
}
return 0;
}
//----------------------------------------------------------------------------
vtkCommand *vtkSubjectHelper::GetCommand(unsigned long tag)
{
vtkObserver *elem = this->Start;
while (elem)
{
if (elem->Tag == tag)
{
return elem->Command;
}
elem = elem->Next;
}
return NULL;
}
//----------------------------------------------------------------------------
void vtkSubjectHelper::PrintSelf(ostream& os, vtkIndent indent)
{
os << indent << "Registered Observers:\n";
indent = indent.GetNextIndent();
vtkObserver *elem = this->Start;
if ( !elem )
{
os << indent << "(none)\n";
return;
}
for ( ; elem; elem=elem->Next )
{
elem->PrintSelf(os, indent);
}
}
//--------------------------------vtkObject observer-----------------------
unsigned long vtkObject::AddObserver(unsigned long event, vtkCommand *cmd, float p)
{
if (!this->SubjectHelper)
{
this->SubjectHelper = new vtkSubjectHelper;
}
return this->SubjectHelper->AddObserver(event,cmd, p);
}
//----------------------------------------------------------------------------
unsigned long vtkObject::AddObserver(const char *event,vtkCommand *cmd, float p)
{
return this->AddObserver(vtkCommand::GetEventIdFromString(event), cmd, p);
}
//----------------------------------------------------------------------------
vtkCommand *vtkObject::GetCommand(unsigned long tag)
{
if (this->SubjectHelper)
{
return this->SubjectHelper->GetCommand(tag);
}
return NULL;
}
//----------------------------------------------------------------------------
void vtkObject::RemoveObserver(unsigned long tag)
{
if (this->SubjectHelper)
{
this->SubjectHelper->RemoveObserver(tag);
}
}
//----------------------------------------------------------------------------
void vtkObject::RemoveObserver(vtkCommand* c)
{
if (this->SubjectHelper)
{
unsigned long tag = this->SubjectHelper->GetTag(c);
while(tag)
{
this->SubjectHelper->RemoveObserver(tag);
tag = this->SubjectHelper->GetTag(c);
}
}
}
//----------------------------------------------------------------------------
void vtkObject::RemoveObservers(unsigned long event)
{
if (this->SubjectHelper)
{
this->SubjectHelper->RemoveObservers(event);
}
}
//----------------------------------------------------------------------------
void vtkObject::RemoveObservers(const char *event)
{
this->RemoveObservers(vtkCommand::GetEventIdFromString(event));
}
//----------------------------------------------------------------------------
void vtkObject::RemoveObservers(unsigned long event, vtkCommand *cmd)
{
if (this->SubjectHelper)
{
this->SubjectHelper->RemoveObservers(event, cmd);
}
}
//----------------------------------------------------------------------------
void vtkObject::RemoveObservers(const char *event, vtkCommand *cmd)
{
this->RemoveObservers(vtkCommand::GetEventIdFromString(event), cmd);
}
//----------------------------------------------------------------------------
void vtkObject::RemoveAllObservers()
{
if ( this->SubjectHelper )
{
this->SubjectHelper->RemoveAllObservers();
}
}
//----------------------------------------------------------------------------
int vtkObject::InvokeEvent(unsigned long event, void *callData)
{
if (this->SubjectHelper)
{
return this->SubjectHelper->InvokeEvent(event,callData, this);
}
return 0;
}
//----------------------------------------------------------------------------
int vtkObject::InvokeEvent(const char *event, void *callData)
{
return this->InvokeEvent(vtkCommand::GetEventIdFromString(event), callData);
}
//----------------------------------------------------------------------------
int vtkObject::HasObserver(unsigned long event)
{
if (this->SubjectHelper)
{
return this->SubjectHelper->HasObserver(event);
}
return 0;
}
//----------------------------------------------------------------------------
int vtkObject::HasObserver(const char *event)
{
return this->HasObserver(vtkCommand::GetEventIdFromString(event));
}
//----------------------------------------------------------------------------
int vtkObject::HasObserver(unsigned long event, vtkCommand *cmd)
{
if (this->SubjectHelper)
{
return this->SubjectHelper->HasObserver(event, cmd);
}
return 0;
}
//----------------------------------------------------------------------------
int vtkObject::HasObserver(const char *event, vtkCommand *cmd)
{
return this->HasObserver(vtkCommand::GetEventIdFromString(event), cmd);
}
//----------------------------------------------------------------------------
void vtkObject::InternalGrabFocus(vtkCommand *mouseEvents, vtkCommand *keypressEvents)
{
if (this->SubjectHelper)
{
this->SubjectHelper->GrabFocus(mouseEvents,keypressEvents);
}
}
//----------------------------------------------------------------------------
void vtkObject::InternalReleaseFocus()
{
if (this->SubjectHelper)
{
this->SubjectHelper->ReleaseFocus();
}
}
//----------------------------------------------------------------------------
void vtkObject::Modified()
{
this->MTime.Modified();
this->InvokeEvent(vtkCommand::ModifiedEvent,NULL);
}
//----------------------------------------------------------------------------
void vtkObject::RegisterInternal(vtkObjectBase* o, vtkTypeBool check)
{
// Print debugging messages.
if(o)
{
vtkDebugMacro(<< "Registered by " << o->GetClassName() << " (" << o
<< "), ReferenceCount = " << this->ReferenceCount+1);
}
else
{
vtkDebugMacro(<< "Registered by NULL, ReferenceCount = "
<< this->ReferenceCount+1);
}
// Increment the reference count.
this->Superclass::RegisterInternal(o, check);
}
//----------------------------------------------------------------------------
void vtkObject::UnRegisterInternal(vtkObjectBase* o, vtkTypeBool check)
{
// Print debugging messages.
if(o)
{
vtkDebugMacro(<< "UnRegistered by "
<< o->GetClassName() << " (" << o << "), ReferenceCount = "
<< (this->ReferenceCount-1));
}
else
{
vtkDebugMacro(<< "UnRegistered by NULL, ReferenceCount = "
<< (this->ReferenceCount-1));
}
if(this->ReferenceCount == 1)
{
// The reference count is 1, so the object is about to be deleted.
// Invoke the delete event.
this->InvokeEvent(vtkCommand::DeleteEvent, 0);
// Clean out observers prior to entering destructor
this->RemoveAllObservers();
}
// Decrement the reference count.
this->Superclass::UnRegisterInternal(o, check);
}
//----------------------------------------------------------------------------
// Internal observer used by vtkObject::AddTemplatedObserver to add a
// vtkClassMemberCallbackBase instance as an observer to an event.
class vtkObjectCommandInternal : public vtkCommand
{
vtkObject::vtkClassMemberCallbackBase* Callable;
public:
static vtkObjectCommandInternal* New()
{ return new vtkObjectCommandInternal(); }
vtkTypeMacro(vtkObjectCommandInternal, vtkCommand);
void Execute(
vtkObject *caller, unsigned long eventId, void *callData) VTK_OVERRIDE
{
if (this->Callable)
{
this->AbortFlagOff();
if((*this->Callable)(caller, eventId, callData))
{
this->AbortFlagOn();
}
}
}
// Takes over the ownership of \c callable.
void SetCallable(vtkObject::vtkClassMemberCallbackBase* callable)
{
delete this->Callable;
this->Callable = callable;
}
protected:
vtkObjectCommandInternal()
{
this->Callable = NULL;
}
~vtkObjectCommandInternal() VTK_OVERRIDE
{
delete this->Callable;
}
};
//----------------------------------------------------------------------------
unsigned long vtkObject::AddTemplatedObserver(
unsigned long event, vtkObject::vtkClassMemberCallbackBase* callable, float priority)
{
vtkObjectCommandInternal* command = vtkObjectCommandInternal::New();
// Takes over the ownership of \c callable.
command->SetCallable(callable);
unsigned long id = this->AddObserver(event, command, priority);
command->Delete();
return id;
}