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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <screenupdater.hxx>
#include <listenercontainer.hxx>
#include <osl/diagnose.h>
#include <functional>
#include <memory>
#include <vector>
#include <algorithm>
namespace {
class UpdateLock : public ::slideshow::internal::ScreenUpdater::UpdateLock
{
public:
explicit UpdateLock (::slideshow::internal::ScreenUpdater& rUpdater);
virtual ~UpdateLock();
virtual void Activate() override;
private:
::slideshow::internal::ScreenUpdater& mrUpdater;
bool mbIsActivated;
};
}
namespace slideshow::internal
{
typedef std::vector<
std::pair<UnoViewSharedPtr,bool> > UpdateRequestVector;
struct ScreenUpdater::ImplScreenUpdater
{
/** List of registered ViewUpdaters, to consult for necessary
updates
*/
ThreadUnsafeListenerContainer<
ViewUpdateSharedPtr,
std::vector<ViewUpdateSharedPtr> > maUpdaters;
/// Views that have been notified for update
UpdateRequestVector maViewUpdateRequests;
/// List of View. Used to issue screen updates on.
UnoViewContainer const& mrViewContainer;
/// True, if a notifyUpdate() for all views has been issued.
bool mbUpdateAllRequest;
/// True, if at least one notifyUpdate() call had bViewClobbered set
bool mbViewClobbered;
/// The screen is updated only when mnLockCount==0
sal_Int32 mnLockCount;
explicit ImplScreenUpdater( UnoViewContainer const& rViewContainer ) :
maUpdaters(),
maViewUpdateRequests(),
mrViewContainer(rViewContainer),
mbUpdateAllRequest(false),
mbViewClobbered(false),
mnLockCount(0)
{}
};
ScreenUpdater::ScreenUpdater( UnoViewContainer const& rViewContainer ) :
mpImpl(new ImplScreenUpdater(rViewContainer) )
{
}
ScreenUpdater::~ScreenUpdater()
{
// outline because of pimpl
}
void ScreenUpdater::notifyUpdate()
{
mpImpl->mbUpdateAllRequest = true;
}
void ScreenUpdater::notifyUpdate( const UnoViewSharedPtr& rView,
bool bViewClobbered )
{
mpImpl->maViewUpdateRequests.emplace_back(rView, bViewClobbered );
if( bViewClobbered )
mpImpl->mbViewClobbered = true;
}
void ScreenUpdater::commitUpdates()
{
if (mpImpl->mnLockCount > 0)
return;
// cases:
// (a) no update necessary at all
// (b) no ViewUpdate-generated update
// I. update all views requested -> for_each( mrViewContainer )
// II. update some views requested -> for_each( maViewUpdateRequests )
// (c) ViewUpdate-triggered update - update all views
// any ViewUpdate-triggered updates?
const bool bViewUpdatesNeeded(
mpImpl->maUpdaters.apply(
std::mem_fn(&ViewUpdate::needsUpdate)) );
if( bViewUpdatesNeeded )
{
mpImpl->maUpdaters.applyAll(
std::mem_fn(&ViewUpdate::update) );
}
if( bViewUpdatesNeeded ||
mpImpl->mbUpdateAllRequest )
{
// unconditionally update all views
for( const auto& pView : mpImpl->mrViewContainer )
{
if( mpImpl->mbViewClobbered )
pView->paintScreen();
else
pView->updateScreen();
}
}
else if( !mpImpl->maViewUpdateRequests.empty() )
{
// update notified views only
for( const auto& rViewUpdateRequest : mpImpl->maViewUpdateRequests )
{
// TODO(P1): this is O(n^2) in the number of views, if
// lots of views notify updates.
const UnoViewVector::const_iterator aEndOfViews(
mpImpl->mrViewContainer.end() );
UnoViewVector::const_iterator aFoundView;
if( (aFoundView=std::find(mpImpl->mrViewContainer.begin(),
aEndOfViews,
rViewUpdateRequest.first)) != aEndOfViews )
{
if( rViewUpdateRequest.second )
(*aFoundView)->paintScreen(); // force-paint
else
(*aFoundView)->updateScreen(); // update changes only
}
}
}
// done - clear requests
mpImpl->mbViewClobbered = false;
mpImpl->mbUpdateAllRequest = false;
UpdateRequestVector().swap( mpImpl->maViewUpdateRequests );
}
void ScreenUpdater::addViewUpdate( ViewUpdateSharedPtr const& rViewUpdate )
{
mpImpl->maUpdaters.add( rViewUpdate );
}
void ScreenUpdater::removeViewUpdate( ViewUpdateSharedPtr const& rViewUpdate )
{
mpImpl->maUpdaters.remove( rViewUpdate );
}
void ScreenUpdater::requestImmediateUpdate()
{
if (mpImpl->mnLockCount > 0)
return;
// TODO(F2): This will interfere with other updates, since it
// happens out-of-sync with main animation loop. Might cause
// artifacts.
for( auto const& pView : mpImpl->mrViewContainer )
pView->updateScreen();
}
void ScreenUpdater::lockUpdates()
{
++mpImpl->mnLockCount;
OSL_ASSERT(mpImpl->mnLockCount>0);
}
void ScreenUpdater::unlockUpdates()
{
OSL_ASSERT(mpImpl->mnLockCount>0);
if (mpImpl->mnLockCount > 0)
{
--mpImpl->mnLockCount;
if (mpImpl->mnLockCount)
commitUpdates();
}
}
::std::shared_ptr<ScreenUpdater::UpdateLock> ScreenUpdater::createLock()
{
return ::std::make_shared<::UpdateLock>(*this);
}
} // namespace slideshow::internal
namespace {
UpdateLock::UpdateLock (
::slideshow::internal::ScreenUpdater& rUpdater)
: mrUpdater(rUpdater),
mbIsActivated(false)
{
}
UpdateLock::~UpdateLock()
{
if (mbIsActivated)
mrUpdater.unlockUpdates();
}
void UpdateLock::Activate()
{
if ( ! mbIsActivated)
{
mbIsActivated = true;
mrUpdater.lockUpdates();
}
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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