// $Revision: 1.2 $
// Feedbacker.C
// Copyright (C) 1994, 1995 Taligent, Inc. All rights reserved.
#ifndef TaligentSamples_FEEDBACKER
#include "Feedbacker.h"
#endif

#ifndef Taligent_GRAPHICS
#include <Taligent/Graphics.h>
#endif

#ifndef Taligent_ASSERTIONS
#include <Taligent/Assertions.h>
#endif

#ifndef Taligent_AREAGEOMETRY
#include <Taligent/AreaGeometry.h>
#endif

#ifndef Taligent_VIEW
#include <Taligent/View.h>
#endif

//................................................................................

MFeedbacker::MFeedbacker(const TViewHandle& view)
	: fFeedback(NIL, NIL), fFeedbackLock(), fView(view)
{
}

MFeedbacker::~MFeedbacker()
{
	Assertion(fFeedback.Count() == 0, "MFeedbacker::~MFeedbacker");
}

void					
MFeedbacker::AdoptFeedback(MGraphic* graphic)
{
	TMonitorEntry entry(&fFeedbackLock);
	Assertion(graphic != NIL, "MFeedbacker::AdoptFeedback");
	Assertion(!fFeedback.Member(*graphic), "MFeedbacker::AdoptFeedback");
	if (fFeedback.Count() == 0) {
		HandleHideCurrentSelectionFeedback();
	}
	fFeedback.Add(graphic);
	HandleFeedbackChanged(graphic->GetLooseFitBounds(GetFeedbackView().GetView()->GetGrafPort()));
}

MGraphic*				
MFeedbacker::OrphanFeedback(const MGraphic& graphic)
{
	TMonitorEntry entry(&fFeedbackLock);
	Assertion(fFeedback.Member(graphic), "MFeedbacker::OrphanFeedback");
	MGraphic* result = fFeedback.Remove(graphic);
	HandleFeedbackChanged(result->GetLooseFitBounds(GetFeedbackView().GetView()->GetGrafPort()));
	if (fFeedback.Count() == 0) {
		HandleShowCurrentSelectionFeedback();
	}
	return result;
}

MGraphic*				
MFeedbacker::ReplaceFeedback(const MGraphic& oldFeedback, MGraphic* newFeedback)
{
	TMonitorEntry entry(&fFeedbackLock);
	Assertion(newFeedback != NIL, "MFeedbacker::ReplaceFeedback");
	Assertion(fFeedback.Member(oldFeedback), "MFeedbacker::ReplaceFeedback");
	MGraphic* result = fFeedback.Remove(oldFeedback);

	TGArea invalidArea(result->GetLooseFitBounds(GetFeedbackView().GetView()->GetGrafPort()));
	invalidArea += newFeedback->GetLooseFitBounds(GetFeedbackView().GetView()->GetGrafPort());
	fFeedback.Add(newFeedback);
	HandleFeedbackChanged(invalidArea);

	return result;
}

bool					
MFeedbacker::DrawFeedback(TGrafPort& port) const
{
	TMonitorEntry entry((TMonitorLock*)&fFeedbackLock);	//cast away const
	TDequeOfIterator<MGraphic> iter(&fFeedback);
	for (MGraphic* item = iter.First(); item != NIL; item = iter.Next()) {
		item->Draw(port);
	}
	return fFeedback.Count() > 0;
}

TViewHandle
MFeedbacker::GetFeedbackView() const
{
	Assertion(fView.GetView() != NIL, "MFeedbacker::GetFeedbackView");
	return fView;
}

void
MFeedbacker::HandleHideCurrentSelectionFeedback()
{
	GetFeedbackView().GetView()->Invalidate();
}

void
MFeedbacker::HandleShowCurrentSelectionFeedback()
{
	GetFeedbackView().GetView()->Invalidate();
}

void			
MFeedbacker::HandleFeedbackChanged(const TGArea& area)
{
	GetFeedbackView().GetView()->Invalidate(area);
}