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qgslocator.cpp
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/
qgslocator.cpp
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/***************************************************************************
qgslocator.cpp
--------------
begin : May 2017
copyright : (C) 2017 by Nyall Dawson
email : nyall dot dawson at gmail dot com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgslocator.h"
#include "qgssettings.h"
#include <QtConcurrent>
#include <functional>
QgsLocator::QgsLocator( QObject *parent )
: QObject( parent )
{
qRegisterMetaType<QgsLocatorResult>( "QgsLocatorResult" );
}
QgsLocator::~QgsLocator()
{
cancelRunningQuery();
qDeleteAll( mFilters );
}
void QgsLocator::deregisterFilter( QgsLocatorFilter *filter )
{
cancelRunningQuery();
mFilters.removeAll( filter );
QString key = mPrefixedFilters.key( filter );
if ( !key.isEmpty() )
mPrefixedFilters.remove( key );
delete filter;
}
QList<QgsLocatorFilter *> QgsLocator::filters()
{
return mFilters;
}
QMap<QString, QgsLocatorFilter *> QgsLocator::prefixedFilters() const
{
return mPrefixedFilters;
}
void QgsLocator::registerFilter( QgsLocatorFilter *filter )
{
mFilters.append( filter );
filter->setParent( this );
if ( !filter->prefix().isEmpty() )
{
if ( filter->name() == QStringLiteral( "actions" ) || filter->name() == QStringLiteral( "processing_alg" )
|| filter->name() == QStringLiteral( "layertree" ) || filter->name() == QStringLiteral( "layouts" )
|| filter->name() == QStringLiteral( "features" ) )
{
//inbuilt filter, no prefix check
mPrefixedFilters.insert( filter->prefix(), filter );
}
else if ( filter->prefix().length() >= 3 )
{
mPrefixedFilters.insert( filter->prefix(), filter );
}
}
// restore settings
QgsSettings settings;
bool enabled = settings.value( QStringLiteral( "locator_filters/enabled_%1" ).arg( filter->name() ), true, QgsSettings::Section::Gui ).toBool();
bool byDefault = settings.value( QStringLiteral( "locator_filters/default_%1" ).arg( filter->name() ), filter->useWithoutPrefix(), QgsSettings::Section::Gui ).toBool();
filter->setEnabled( enabled );
filter->setUseWithoutPrefix( byDefault );
}
void QgsLocator::fetchResults( const QString &string, const QgsLocatorContext &context, QgsFeedback *feedback )
{
// ideally this should not be required, as well behaved callers
// will NOT fire up a new fetchResults call while an existing one is
// operating/waiting to be canceled...
cancelRunningQuery();
// if no feedback object was passed, create one that is owned by this object
// to ensure that filters ALWAYS receive a valid feedback
if ( !feedback )
{
mOwnedFeedback.reset( new QgsFeedback() );
feedback = mOwnedFeedback.get();
}
else
{
mOwnedFeedback.reset( nullptr );
}
mFeedback = feedback;
QList< QgsLocatorFilter * > activeFilters;
QString searchString = string;
if ( searchString.indexOf( ' ' ) > 0 )
{
QString prefix = searchString.left( searchString.indexOf( ' ' ) );
if ( mPrefixedFilters.contains( prefix ) && mPrefixedFilters.value( prefix )->enabled() )
{
activeFilters << mPrefixedFilters.value( prefix );
searchString = searchString.mid( prefix.length() + 1 );
}
}
if ( activeFilters.isEmpty() )
{
for ( QgsLocatorFilter *filter : qgis::as_const( mFilters ) )
{
if ( filter->useWithoutPrefix() && filter->enabled() )
activeFilters << filter;
}
}
QList< QgsLocatorFilter *> threadedFilters;
for ( QgsLocatorFilter *filter : qgis::as_const( activeFilters ) )
{
std::unique_ptr< QgsLocatorFilter > clone( filter->clone() );
connect( clone.get(), &QgsLocatorFilter::resultFetched, clone.get(), [this, filter]( QgsLocatorResult result )
{
result.filter = filter;
emit filterSentResult( result );
} );
clone->prepare( searchString, context );
if ( clone->flags() & QgsLocatorFilter::FlagFast )
{
// filter is fast enough to fetch results on the main thread
clone->fetchResults( searchString, context, feedback );
}
else
{
// run filter in background
threadedFilters.append( clone.release() );
}
}
mActiveThreads.clear();
for ( QgsLocatorFilter *filter : qgis::as_const( threadedFilters ) )
{
QThread *thread = new QThread();
mActiveThreads.append( thread );
filter->moveToThread( thread );
connect( thread, &QThread::started, filter, [filter, searchString, context, feedback]
{
filter->executeSearchAndDelete( searchString, context, feedback );
}, Qt::QueuedConnection );
connect( filter, &QgsLocatorFilter::finished, thread, [thread]
{
thread->quit();
} );
connect( filter, &QgsLocatorFilter::finished, filter, &QgsLocatorFilter::deleteLater );
connect( thread, &QThread::finished, thread, [this, thread]
{
mActiveThreads.removeAll( thread );
if ( mActiveThreads.empty() )
emit finished();
} );
connect( thread, &QThread::finished, thread, &QThread::deleteLater );
thread->start();
}
if ( mActiveThreads.empty() )
emit finished();
}
void QgsLocator::cancel()
{
cancelRunningQuery();
}
void QgsLocator::cancelWithoutBlocking()
{
if ( mFeedback )
mFeedback->cancel();
}
bool QgsLocator::isRunning() const
{
return !mActiveThreads.empty();
}
void QgsLocator::filterSentResult( QgsLocatorResult result )
{
// if query has been canceled then discard any results we receive
if ( mFeedback->isCanceled() )
return;
emit foundResult( result );
}
void QgsLocator::cancelRunningQuery()
{
if ( !mActiveThreads.empty() )
{
// cancel existing job
mFeedback->cancel();
while ( !mActiveThreads.empty() )
{
QCoreApplication::processEvents();
}
}
}