qgslayoutlegendlayersdialog.cpp

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/***************************************************************************
    qgslayoutlegendlayersdialog.cpp
    -------------------------------
    begin                : October 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 "qgslayoutlegendlayersdialog.h"
 
#include <QStandardItem>
#include "qgsmaplayer.h"
#include "qgsmaplayermodel.h"
#include "qgsmaplayerproxymodel.h"
#include "qgssettings.h"
#include "qgsgui.h"
#include "qgshelp.h"
 
QgsLayoutLegendLayersDialog::QgsLayoutLegendLayersDialog( QWidget *parent )
  : QDialog( parent )
{
  setupUi( this );
  QgsGui::enableAutoGeometryRestore( this );
 
  mFilterLineEdit->setShowClearButton( true );
  mFilterLineEdit->setShowSearchIcon( true );
 
  mModel = new QgsMapLayerProxyModel( listMapLayers );
  listMapLayers->setModel( mModel );
  const QModelIndex firstLayer = mModel->index( 0, 0 );
  listMapLayers->selectionModel()->select( firstLayer, QItemSelectionModel::Select );
 
  connect( listMapLayers, &QListView::doubleClicked, this, &QgsLayoutLegendLayersDialog::accept );
 
  connect( mFilterLineEdit, &QLineEdit::textChanged, mModel, &QgsMapLayerProxyModel::setFilterString );
  connect( mCheckBoxVisibleLayers, &QCheckBox::toggled, this, &QgsLayoutLegendLayersDialog::filterVisible );
  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsLayoutLegendLayersDialog::showHelp );
 
  mFilterLineEdit->setFocus();
}
 
void QgsLayoutLegendLayersDialog::setVisibleLayers( const QList<QgsMapLayer *> &layers )
{
  mVisibleLayers = layers;
}
 
QList< QgsMapLayer *> QgsLayoutLegendLayersDialog::selectedLayers() const
{
  QList< QgsMapLayer * > layers;
 
  const QModelIndexList selection = listMapLayers->selectionModel()->selectedIndexes();
  for ( const QModelIndex &index : selection )
  {
    const QModelIndex sourceIndex = mModel->mapToSource( index );
    if ( !sourceIndex.isValid() )
    {
      continue;
    }
 
    QgsMapLayer *layer = mModel->sourceLayerModel()->layerFromIndex( sourceIndex );
    if ( layer )
      layers << layer;
  }
  return layers;
}
 
void QgsLayoutLegendLayersDialog::filterVisible( bool enabled )
{
  if ( enabled )
    mModel->setLayerAllowlist( mVisibleLayers );
  else
    mModel->setLayerAllowlist( QList< QgsMapLayer * >() );
}
 
void QgsLayoutLegendLayersDialog::showHelp()
{
  QgsHelp::openHelp( QStringLiteral( "print_composer/composer_items/composer_legend.html#legend-items" ) );
}