qgsexpressionbuilderdialog.cpp

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/***************************************************************************
    qgisexpressionbuilderdialog.h - A generic expression builder dialog.
     --------------------------------------
    Date                 :  29-May-2011
    Copyright            : (C) 2011 by Nathan Woodrow
    Email                : woodrow.nathan 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 "qgsexpressionbuilderdialog.h"
#include "qgssettings.h"
#include "qgsguiutils.h"
#include "qgsgui.h"
#include <QMessageBox>
 
QgsExpressionBuilderDialog::QgsExpressionBuilderDialog( QgsVectorLayer *layer, const QString &startText, QWidget *parent, const QString &key, const QgsExpressionContext &context )
  : QDialog( parent )
  , mInitialText( startText )
  , mRecentKey( key )
{
  setupUi( this );
  QgsGui::enableAutoGeometryRestore( this );
 
  connect( builder, &QgsExpressionBuilderWidget::parserErrorChanged, this, &QgsExpressionBuilderDialog::syncOkButtonEnabledState );
  connect( builder, &QgsExpressionBuilderWidget::evalErrorChanged, this, &QgsExpressionBuilderDialog::syncOkButtonEnabledState );
 
  builder->setExpressionContext( context );
  builder->setLayer( layer );
  builder->setExpressionText( startText );
  builder->expressionTree()->loadRecent( mRecentKey );
  builder->expressionTree()->loadUserExpressions( );
 
 
  connect( buttonBox, &QDialogButtonBox::helpRequested, this, &QgsExpressionBuilderDialog::showHelp );
}
 
QgsExpressionBuilderWidget *QgsExpressionBuilderDialog::expressionBuilder()
{
  return builder;
}
 
void QgsExpressionBuilderDialog::setExpressionText( const QString &text )
{
  builder->setExpressionText( text );
}
 
QString QgsExpressionBuilderDialog::expressionText()
{
  return builder->expressionText();
}
 
QString QgsExpressionBuilderDialog::expectedOutputFormat()
{
  return builder->expectedOutputFormat();
}
 
void QgsExpressionBuilderDialog::setExpectedOutputFormat( const QString &expected )
{
  builder->setExpectedOutputFormat( expected );
}
 
QgsExpressionContext QgsExpressionBuilderDialog::expressionContext() const
{
  return builder->expressionContext();
}
 
void QgsExpressionBuilderDialog::setExpressionContext( const QgsExpressionContext &context )
{
  builder->setExpressionContext( context );
}
 
void QgsExpressionBuilderDialog::done( int r )
{
  QDialog::done( r );
}
 
void QgsExpressionBuilderDialog::accept()
{
  builder->expressionTree()->saveToRecent( builder->expressionText(), mRecentKey );
  QDialog::accept();
}
 
void QgsExpressionBuilderDialog::reject()
{
 
  if ( builder->expressionText() != mInitialText )
  {
 
    QgsSettings settings;
    const bool askToDiscardEditedExpression = settings.value( QStringLiteral( "askToDiscardEditedExpression" ), true, QgsSettings::Gui ).toBool();
 
    if ( askToDiscardEditedExpression )
    {
      QMessageBox confirmMessage( QMessageBox::Question,
                                  tr( "Expression was Edited" ),
                                  tr( "The changes to the expression will be discarded. Would you like to continue?" ),
                                  QMessageBox::Yes | QMessageBox::No,
                                  this );
      confirmMessage.setCheckBox( new QCheckBox( tr( "Don't show this message again" ) ) );
      confirmMessage.checkBox()->setChecked( false );
      confirmMessage.button( QMessageBox::Yes )->setText( tr( "Discard changes" ) );
 
      int res = confirmMessage.exec();
 
      if ( confirmMessage.checkBox()->isChecked() )
      {
        settings.setValue( QStringLiteral( "askToDiscardEditedExpression" ), false, QgsSettings::Gui );
      }
 
      if ( res != QMessageBox::Yes )
        return;
    }
  }
 
  QDialog::reject();
}
 
void QgsExpressionBuilderDialog::setGeomCalculator( const QgsDistanceArea &da )
{
  // Store in child widget only.
  builder->setGeomCalculator( da );
}
 
bool QgsExpressionBuilderDialog::allowEvalErrors() const
{
  return mAllowEvalErrors;
}
 
void QgsExpressionBuilderDialog::setAllowEvalErrors( bool allowEvalErrors )
{
  if ( allowEvalErrors == mAllowEvalErrors )
    return;
 
  mAllowEvalErrors = allowEvalErrors;
  syncOkButtonEnabledState();
  emit allowEvalErrorsChanged();
}
 
void QgsExpressionBuilderDialog::showHelp()
{
  QgsHelp::openHelp( QStringLiteral( "working_with_vector/expression.html" ) );
}
 
void QgsExpressionBuilderDialog::syncOkButtonEnabledState()
{
  QPushButton *okButton = buttonBox->button( QDialogButtonBox::Ok );
 
  if ( builder->parserError() )
    okButton->setEnabled( false );
  else
    okButton->setEnabled( true );
}