qgsunitselectionwidget.cpp

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/***************************************************************************
    qgsunitselectionwidget.h
    -------------------
    begin                : Mar 24, 2014
    copyright            : (C) 2014 Sandro Mani
    email                : [email protected]

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

/***************************************************************************
 *                                                                         *
 *   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 "qgsunitselectionwidget.h"

QgsMapUnitScaleDialog::QgsMapUnitScaleDialog( QWidget* parent )
    : QDialog( parent )
{
  setupUi( this );
  mComboBoxMinScale->setScale( 0.0000001 );
  mComboBoxMaxScale->setScale( 1 );
  connect( mCheckBoxMinScale, SIGNAL( toggled( bool ) ), this, SLOT( configureMinComboBox() ) );
  connect( mCheckBoxMaxScale, SIGNAL( toggled( bool ) ), this, SLOT( configureMaxComboBox() ) );
  connect( mComboBoxMinScale, SIGNAL( scaleChanged() ), this, SLOT( configureMaxComboBox() ) );
  connect( mComboBoxMaxScale, SIGNAL( scaleChanged() ), this, SLOT( configureMinComboBox() ) );
}

void QgsMapUnitScaleDialog::setMapUnitScale( const QgsMapUnitScale &scale )
{
  mComboBoxMinScale->setScale( scale.minScale > 0.0 ? scale.minScale : 0.0000001 );
  mCheckBoxMinScale->setChecked( scale.minScale > 0.0 );
  mComboBoxMinScale->setEnabled( scale.minScale > 0.0 );
  mComboBoxMaxScale->setScale( scale.maxScale > 0.0 ? scale.maxScale : 1.0 );
  mCheckBoxMaxScale->setChecked( scale.maxScale > 0.0 );
  mComboBoxMaxScale->setEnabled( scale.maxScale > 0.0 );
}

void QgsMapUnitScaleDialog::configureMinComboBox()
{
  mComboBoxMinScale->setEnabled( mCheckBoxMinScale->isChecked() );
  if ( mCheckBoxMinScale->isChecked() && mComboBoxMinScale->scale() > mComboBoxMaxScale->scale() )
  {
    mComboBoxMinScale->setScale( mComboBoxMaxScale->scale() );
  }
}

void QgsMapUnitScaleDialog::configureMaxComboBox()
{
  mComboBoxMaxScale->setEnabled( mCheckBoxMaxScale->isChecked() );
  if ( mCheckBoxMaxScale->isChecked() && mComboBoxMaxScale->scale() < mComboBoxMinScale->scale() )
  {
    mComboBoxMaxScale->setScale( mComboBoxMinScale->scale() );
  }
}

QgsMapUnitScale QgsMapUnitScaleDialog::getMapUnitScale() const
{
  QgsMapUnitScale scale;
  scale.minScale = mCheckBoxMinScale->isChecked() ? mComboBoxMinScale->scale() : 0;
  scale.maxScale = mCheckBoxMaxScale->isChecked() ? mComboBoxMaxScale->scale() : 0;
  return scale;
}


QgsUnitSelectionWidget::QgsUnitSelectionWidget( QWidget *parent )
    : QWidget( parent )
{
  mMapUnitIdx = -1;
  mUnitScaleDialog = new QgsMapUnitScaleDialog( this );

  setupUi( this );
  mMapScaleButton->setVisible( false );
  mMapScaleButton->setToolTip( tr( "Adjust scaling range" ) );

  setFocusPolicy( Qt::StrongFocus );
  setFocusProxy( mUnitCombo );

  connect( mUnitCombo, SIGNAL( currentIndexChanged( int ) ), this, SLOT( toggleUnitRangeButton() ) );
  connect( mMapScaleButton, SIGNAL( clicked() ), this, SLOT( showDialog() ) );
  connect( mUnitCombo, SIGNAL( currentIndexChanged( int ) ), this, SIGNAL( changed() ) );
}

void QgsUnitSelectionWidget::setUnits( const QStringList &units, int mapUnitIdx )
{
  blockSignals( true );
  mUnitCombo->addItems( units );
  mMapUnitIdx = mapUnitIdx;
  blockSignals( false );
}

void QgsUnitSelectionWidget::setUnits( const QgsSymbolV2::OutputUnitList &units )
{
  blockSignals( true );
  mUnitCombo->clear();

  //instead of iterating over the units list, we specifically check for presence of unit types
  //to ensure that the widget always keeps the same order for units, regardless of the
  //order specified in the units list
  mMapUnitIdx = -1;
  if ( units.contains( QgsSymbolV2::MM ) )
  {
    mUnitCombo->addItem( tr( "Millimeter" ), QgsSymbolV2::MM );
  }
  if ( units.contains( QgsSymbolV2::Pixel ) )
  {
    mUnitCombo->addItem( tr( "Pixels" ), QgsSymbolV2::Pixel );
  }
  if ( units.contains( QgsSymbolV2::MapUnit ) )
  {
    mUnitCombo->addItem( tr( "Map unit" ), QgsSymbolV2::MapUnit );
  }
  blockSignals( false );
}

QgsSymbolV2::OutputUnit QgsUnitSelectionWidget::unit() const
{
  if ( mUnitCombo->count() == 0 )
    return QgsSymbolV2::Mixed;

  QVariant currentData = mUnitCombo->itemData( mUnitCombo->currentIndex() );
  if ( currentData.isValid() )
  {
    return ( QgsSymbolV2::OutputUnit ) currentData.toInt();
  }
  //unknown
  return QgsSymbolV2::Mixed;
}

void QgsUnitSelectionWidget::setUnit( int unitIndex )
{
  blockSignals( true );
  mUnitCombo->setCurrentIndex( unitIndex );
  blockSignals( false );
}

void QgsUnitSelectionWidget::setUnit( QgsSymbolV2::OutputUnit unit )
{
  int idx = mUnitCombo->findData( QVariant(( int ) unit ) );
  mUnitCombo->setCurrentIndex( idx == -1 ? 0 : idx );
}

void QgsUnitSelectionWidget::showDialog()
{
  QgsMapUnitScale scale = mUnitScaleDialog->getMapUnitScale();
  if ( mUnitScaleDialog->exec() != QDialog::Accepted )
  {
    mUnitScaleDialog->setMapUnitScale( scale );
  }
  else
  {
    QgsMapUnitScale newScale = mUnitScaleDialog->getMapUnitScale();
    if ( scale.minScale != newScale.minScale || scale.maxScale != newScale.maxScale )
    {
      emit changed();
    }
  }
}

void QgsUnitSelectionWidget::toggleUnitRangeButton()
{
  if ( unit() != QgsSymbolV2::Mixed )
  {
    mMapScaleButton->setVisible( unit() == QgsSymbolV2::MapUnit );
  }
  else
  {
    mMapScaleButton->setVisible( mMapUnitIdx != -1 && mUnitCombo->currentIndex() == mMapUnitIdx );
  }
}