qgsvertexeditor.cpp

/***************************************************************************
                               qgsvertexeditor.cpp
                               -----------------
        begin                : Tue Mar 24 2015
        copyright            : (C) 2015 Sandro Mani / Sourcepole AG
        email                : smani@sourcepole.ch

 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 "qgsvertexeditor.h"
#include "qgsmapcanvas.h"
#include "qgsmessagelog.h"
#include "qgsselectedfeature.h"
#include "qgsvertexentry.h"
#include "qgsvectorlayer.h"
#include "qgsgeometryutils.h"
#include "qgsproject.h"
#include "qgscoordinatetransform.h"

#include <QLabel>
#include <QTableWidget>
#include <QHeaderView>
#include <QVBoxLayout>
#include <QStyledItemDelegate>
#include <QKeyEvent>
#include <QLineEdit>
#include <QVector2D>

static const int MIN_RADIUS_ROLE = Qt::UserRole + 1;


QgsVertexEditorModel::QgsVertexEditorModel( QgsVectorLayer *layer, QgsSelectedFeature *selectedFeature, QgsMapCanvas *canvas, QObject *parent )
  : QAbstractTableModel( parent )
  , mLayer( layer )
  , mSelectedFeature( selectedFeature )
  , mCanvas( canvas )
  , mHasZ( false )
  , mHasM( false )
  , mHasR( true ) //always show for now - avoids scanning whole feature for curves TODO - avoid this
  , mZCol( -1 )
  , mMCol( -1 )
  , mRCol( -1 )
{

  QgsWkbTypes::Type layerWKBType = mLayer->wkbType();

  mHasZ = QgsWkbTypes::hasZ( layerWKBType );
  mHasM = QgsWkbTypes::hasM( layerWKBType );

  if ( mHasZ )
    mZCol = 2;

  if ( mHasM )
    mMCol = 2 + ( mHasZ ? 1 : 0 );

  if ( mHasR )
    mRCol = 2 + ( mHasZ ? 1 : 0 ) + ( mHasM ? 1 : 0 );

  QWidget *parentWidget = dynamic_cast< QWidget * >( parent );
  if ( parentWidget )
  {
    mWidgetFont = parentWidget->font();
  }

}

int QgsVertexEditorModel::rowCount( const QModelIndex &parent ) const
{
  if ( parent.isValid() || !mSelectedFeature )
    return 0;

  return mSelectedFeature->vertexMap().count();
}

int QgsVertexEditorModel::columnCount( const QModelIndex &parent ) const
{
  Q_UNUSED( parent );
  return 2 + ( mHasZ ? 1 : 0 ) + ( mHasM ? 1 : 0 ) + ( mHasR ? 1 : 0 );
}

QVariant QgsVertexEditorModel::data( const QModelIndex &index, int role ) const
{
  if ( !index.isValid() || !mSelectedFeature ||
       ( role != Qt::DisplayRole && role != Qt::EditRole && role != MIN_RADIUS_ROLE && role != Qt::FontRole ) )
    return QVariant();

  if ( index.row() >= mSelectedFeature->vertexMap().count() )
    return QVariant();

  if ( index.column() >= columnCount() )
    return QVariant();

  //get QgsVertexEntry for row
  const QgsVertexEntry *vertex = mSelectedFeature->vertexMap().at( index.row() );
  if ( !vertex )
  {
    return QVariant();
  }

  if ( role == Qt::FontRole )
  {
    double r = 0;
    double minRadius = 0;
    QFont font = mWidgetFont;
    bool fontChanged = false;
    if ( vertex->isSelected() )
    {
      font.setBold( true );
      fontChanged = true;
    }
    if ( calcR( index.row(), r, minRadius ) )
    {
      font.setItalic( true );
      fontChanged = true;;
    }
    if ( fontChanged )
    {
      return font;
    }
    else
    {
      return QVariant();
    }
  }

  if ( role == MIN_RADIUS_ROLE )
  {
    if ( index.column() == mRCol )
    {
      double r = 0;
      double minRadius = 0;
      if ( calcR( index.row(), r, minRadius ) )
      {
        return minRadius;
      }
    }
    return QVariant();
  }

  if ( index.column() == 0 )
    return vertex->point().x();
  else if ( index.column() == 1 )
    return vertex->point().y();
  else if ( index.column() == mZCol )
    return vertex->point().z();
  else if ( index.column() == mMCol )
    return vertex->point().m();
  else if ( index.column() == mRCol )
  {
    double r = 0;
    double minRadius = 0;
    if ( calcR( index.row(), r, minRadius ) )
    {
      return r;
    }
    return QVariant();
  }
  else
  {
    return QVariant();
  }

}

QVariant QgsVertexEditorModel::headerData( int section, Qt::Orientation orientation, int role ) const
{
  if ( role == Qt::DisplayRole )
  {
    if ( orientation == Qt::Vertical ) //row
    {
      return QVariant( section );
    }
    else
    {
      if ( section == 0 )
        return QVariant( tr( "x" ) );
      else if ( section == 1 )
        return QVariant( tr( "y" ) );
      else if ( section == mZCol )
        return QVariant( tr( "z" ) );
      else if ( section == mMCol )
        return QVariant( tr( "m" ) );
      else if ( section == mRCol )
        return QVariant( tr( "r" ) );
      else
        return QVariant();
    }
  }
  else
  {
    return QVariant();
  }
}

bool QgsVertexEditorModel::setData( const QModelIndex &index, const QVariant &value, int role )
{
  if ( !index.isValid() || role != Qt::EditRole )
  {
    return false;
  }
  if ( !mSelectedFeature || index.row() >= mSelectedFeature->vertexMap().count() )
  {
    return false;
  }

  // Get double value wrt current locale.
  bool ok;
  double doubleValue = QLocale().toDouble( value.toString(), &ok );
  // If not valid and locale's decimal point is not '.' let's try with english locale
  if ( ! ok && QLocale().decimalPoint() != '.' )
  {
    doubleValue = QLocale( QLocale::English ).toDouble( value.toString() );
  }

  double x = ( index.column() == 0 ? doubleValue : mSelectedFeature->vertexMap().at( index.row() )->point().x() );
  double y = ( index.column() == 1 ? doubleValue : mSelectedFeature->vertexMap().at( index.row() )->point().y() );

  if ( index.column() == mRCol ) // radius modified
  {
    if ( index.row() == 0 || index.row() >= mSelectedFeature->vertexMap().count() - 1 )
      return false;

    double x1 = mSelectedFeature->vertexMap().at( index.row() - 1 )->point().x();
    double y1 = mSelectedFeature->vertexMap().at( index.row() - 1 )->point().y();
    double x2 = x;
    double y2 = y;
    double x3 = mSelectedFeature->vertexMap().at( index.row() + 1 )->point().x();
    double y3 = mSelectedFeature->vertexMap().at( index.row() + 1 )->point().y();

    QgsPoint result;
    if ( QgsGeometryUtils::segmentMidPoint( QgsPoint( x1, y1 ), QgsPoint( x3, y3 ), result, doubleValue, QgsPoint( x2, y2 ) ) )
    {
      x = result.x();
      y = result.y();
    }
  }
  double z = ( index.column() == mZCol ? value.toDouble() : mSelectedFeature->vertexMap().at( index.row() )->point().z() );
  double m = ( index.column() == mMCol ? value.toDouble() : mSelectedFeature->vertexMap().at( index.row() )->point().m() );
  QgsPoint p( QgsWkbTypes::PointZM, x, y, z, m );

  mLayer->beginEditCommand( QObject::tr( "Moved vertices" ) );
  mLayer->moveVertex( p, mSelectedFeature->featureId(), index.row() );
  mLayer->endEditCommand();
  mLayer->triggerRepaint();

  return false;
}

Qt::ItemFlags QgsVertexEditorModel::flags( const QModelIndex &index ) const
{
  Qt::ItemFlags flags = QAbstractTableModel::flags( index );

  if ( index.isValid() )
  {
    return flags | Qt::ItemIsEditable;
  }
  else
  {
    return flags;
  }
}

bool QgsVertexEditorModel::calcR( int row, double &r, double &minRadius ) const
{
  if ( row <= 0 || !mSelectedFeature || row >= mSelectedFeature->vertexMap().count() - 1 )
    return false;

  const QgsVertexEntry *entry = mSelectedFeature->vertexMap().at( row );

  bool curvePoint = ( entry->vertexId().type == QgsVertexId::CurveVertex );
  if ( !curvePoint )
    return false;

  const QgsPoint &p1 = mSelectedFeature->vertexMap().at( row - 1 )->point();
  const QgsPoint &p2 = mSelectedFeature->vertexMap().at( row )->point();
  const QgsPoint &p3 = mSelectedFeature->vertexMap().at( row + 1 )->point();

  double cx, cy;
  QgsGeometryUtils::circleCenterRadius( p1, p2, p3, r, cx, cy );

  double x13 = p3.x() - p1.x(), y13 = p3.y() - p1.y();
  minRadius = 0.5 * std::sqrt( x13 * x13 + y13 * y13 );

  return true;
}


QgsVertexEditor::QgsVertexEditor( QgsMapCanvas *canvas )
  : mCanvas( canvas )
{
  setWindowTitle( tr( "Vertex Editor" ) );
  setObjectName( QStringLiteral( "VertexEditor" ) );

  QWidget *content = new QWidget( this );
  content->setMinimumHeight( 160 );
  QVBoxLayout *layout = new QVBoxLayout( content );
  layout->setContentsMargins( 0, 0, 0, 0 );

  mHintLabel = new QLabel( this );
  mHintLabel->setText( QStringLiteral( "%1\n\n%2" ).arg( tr( "Right click on the edge of an editable feature to show its table of vertices." ),
                       tr( "When a feature is bound to this panel, dragging a rectangle to select vertices on the canvas will only select those of the bound feature." ) ) );
  mHintLabel->setWordWrap( true );
  mHintLabel->setAlignment( Qt::AlignHCenter | Qt::AlignVCenter );

  mTableView = new QTableView( this );
  mTableView->setSelectionMode( QTableWidget::ExtendedSelection );
  mTableView->setSelectionBehavior( QTableWidget::SelectRows );
  mTableView->setItemDelegateForColumn( 0, new CoordinateItemDelegate( this ) );
  mTableView->setItemDelegateForColumn( 1, new CoordinateItemDelegate( this ) );
  mTableView->setItemDelegateForColumn( 2, new CoordinateItemDelegate( this ) );
  mTableView->setItemDelegateForColumn( 3, new CoordinateItemDelegate( this ) );
  mTableView->setItemDelegateForColumn( 4, new CoordinateItemDelegate( this ) );
  mTableView->setVisible( false );

  layout->addWidget( mTableView );
  layout->addWidget( mHintLabel );

  setWidget( content );
}

void QgsVertexEditor::updateEditor( QgsSelectedFeature *selectedFeature )
{
  if ( mSelectedFeature )
  {
    delete mVertexModel;
    mVertexModel = nullptr;
  }

  mSelectedFeature = selectedFeature;

  if ( mSelectedFeature )
  {
    // TODO We really should just update the model itself.
    mVertexModel = new QgsVertexEditorModel( mSelectedFeature->layer(), mSelectedFeature, mCanvas, this );
    mTableView->setModel( mVertexModel );

    mHintLabel->setVisible( false );
    mTableView->setVisible( true );

    connect( mTableView->selectionModel(), &QItemSelectionModel::selectionChanged, this, &QgsVertexEditor::updateVertexSelection );
    connect( mSelectedFeature, &QgsSelectedFeature::selectionChanged, this, &QgsVertexEditor::updateTableSelection );
  }
  else
  {
    mHintLabel->setVisible( true );
    mTableView->setVisible( false );
  }
}

void QgsVertexEditor::updateTableSelection()
{
  if ( !mSelectedFeature || mUpdatingVertexSelection )
    return;

  mUpdatingTableSelection = true;
  mTableView->selectionModel()->clearSelection();
  const QList<QgsVertexEntry *> &vertexMap = mSelectedFeature->vertexMap();
  int firstSelectedRow = -1;
  QItemSelection selection;
  for ( int i = 0, n = vertexMap.size(); i < n; ++i )
  {
    if ( vertexMap[i]->isSelected() )
    {
      if ( firstSelectedRow < 0 )
        firstSelectedRow = i;
      selection.select( mVertexModel->index( i, 0 ), mVertexModel->index( i, mVertexModel->columnCount() - 1 ) );
    }
  }
  mTableView->selectionModel()->select( selection, QItemSelectionModel::Select );

  if ( firstSelectedRow >= 0 )
    mTableView->scrollTo( mVertexModel->index( firstSelectedRow, 0 ), QAbstractItemView::PositionAtTop );

  mUpdatingTableSelection = false;
}

void QgsVertexEditor::updateVertexSelection( const QItemSelection &selected, const QItemSelection & )
{
  if ( !mSelectedFeature || mUpdatingTableSelection )
    return;

  mUpdatingVertexSelection = true;

  mSelectedFeature->deselectAllVertices();

  QgsCoordinateTransform t( mSelectedFeature->layer()->crs(), mCanvas->mapSettings().destinationCrs(), QgsProject::instance() );
  std::unique_ptr<QgsRectangle> bbox;
  QModelIndexList indexList = selected.indexes();
  for ( int i = 0; i < indexList.length(); ++i )
  {
    int vertexIdx = indexList.at( i ).row();
    mSelectedFeature->selectVertex( vertexIdx );

    // create a bounding box of selected vertices
    QgsPointXY point( mSelectedFeature->vertexMap().at( vertexIdx )->point() );
    if ( !bbox )
      bbox.reset( new QgsRectangle( point, point ) );
    else
      bbox->combineExtentWith( point );
  }

  //ensure that newly selected vertices are visible in canvas
  if ( bbox )
  {
    try
    {
      QgsRectangle transformedBbox = t.transform( *bbox );
      QgsRectangle canvasExtent = mCanvas->mapSettings().extent();
      transformedBbox.combineExtentWith( canvasExtent );
      mCanvas->setExtent( transformedBbox );
    }
    catch ( QgsCsException &cse )
    {
      QgsMessageLog::logMessage( QObject::tr( "Simplify transform error caught: %1" ).arg( cse.what() ), QObject::tr( "CRS" ) );
    }
  }

  mUpdatingVertexSelection = false;
}

void QgsVertexEditor::keyPressEvent( QKeyEvent *e )
{
  if ( e->key() == Qt::Key_Backspace || e->key() == Qt::Key_Delete )
  {
    emit deleteSelectedRequested();

    // Override default shortcut management in MapCanvas
    e->ignore();
  }
}

void QgsVertexEditor::closeEvent( QCloseEvent *event )
{
  QgsDockWidget::closeEvent( event );

  emit editorClosed();
}

//
// CoordinateItemDelegate
//

CoordinateItemDelegate::CoordinateItemDelegate( QObject *parent )
  : QStyledItemDelegate( parent )
{

}

QString CoordinateItemDelegate::displayText( const QVariant &value, const QLocale &locale ) const
{
  return locale.toString( value.toDouble(), 'f', 4 );
}

QWidget *CoordinateItemDelegate::createEditor( QWidget *parent, const QStyleOptionViewItem &, const QModelIndex &index ) const
{
  QLineEdit *lineEdit = new QLineEdit( parent );
  QDoubleValidator *validator = new QDoubleValidator();
  if ( !index.data( MIN_RADIUS_ROLE ).isNull() )
    validator->setBottom( index.data( MIN_RADIUS_ROLE ).toDouble() );
  lineEdit->setValidator( validator );
  return lineEdit;
}

void CoordinateItemDelegate::setModelData( QWidget *editor, QAbstractItemModel *model, const QModelIndex &index ) const
{
  QLineEdit *lineEdit = qobject_cast<QLineEdit *>( editor );
  if ( lineEdit->hasAcceptableInput() )
  {
    QStyledItemDelegate::setModelData( editor, model, index );
  }
}