/***************************************************************************
                         qgsstatusbarscalewidget.cpp
    begin                : May 2016
    copyright            : (C) 2016 Denis Rouzaud
    email                : denis.rouzaud@gmail.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 <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QToolButton>
#include <QValidator>

#include "qgsstatusbarscalewidget.h"

#include "qgsmapcanvas.h"
#include "qgsscalecombobox.h"

QgsStatusBarScaleWidget::QgsStatusBarScaleWidget( QgsMapCanvas *canvas, QWidget *parent )
    : QWidget( parent )
    , mMapCanvas( canvas )
{
  // add a label to show current scale
  mLabel = new QLabel();
  mLabel->setObjectName( QStringLiteral( "mScaleLabel" ) );
  mLabel->setMinimumWidth( 10 );
  //mScaleLabel->setMaximumHeight( 20 );
  mLabel->setMargin( 3 );
  mLabel->setAlignment( Qt::AlignCenter );
  mLabel->setFrameStyle( QFrame::NoFrame );
  mLabel->setText( tr( "Scale" ) );
  mLabel->setToolTip( tr( "Current map scale" ) );

  mScale = new QgsScaleComboBox();
  mScale->setObjectName( QStringLiteral( "mScaleEdit" ) );
  // seems setFont() change font only for popup not for line edit,
  // so we need to set font for it separately
  mScale->setMinimumWidth( 10 );
  mScale->setContentsMargins( 0, 0, 0, 0 );
  mScale->setWhatsThis( tr( "Displays the current map scale" ) );
  mScale->setToolTip( tr( "Current map scale (formatted as x:y)" ) );

  mLockButton = new QToolButton();
  mLockButton->setIcon( QIcon( QgsApplication::getThemeIcon( "/lockedGray.svg" ) ) );
  mLockButton->setToolTip( tr( "Lock the scale to use magnifier to zoom in or out." ) );
  mLockButton->setCheckable( true );
  mLockButton->setChecked( false );
  mLockButton->setAutoRaise( true );

  // layout
  mLayout = new QHBoxLayout( this );
  mLayout->addWidget( mLabel );
  mLayout->addWidget( mScale );
  mLayout->addWidget( mLockButton );
  mLayout->setContentsMargins( 0, 0, 0, 0 );
  mLayout->setAlignment( Qt::AlignRight );
  mLayout->setSpacing( 0 );

  setLayout( mLayout );

  connect( mScale, SIGNAL( scaleChanged( double ) ), this, SLOT( userScale() ) );

  connect( mLockButton, SIGNAL( toggled( bool ) ), this, SIGNAL( scaleLockChanged( bool ) ) );
  connect( mLockButton, SIGNAL( toggled( bool ) ), mScale, SLOT( setDisabled( bool ) ) );
}

QgsStatusBarScaleWidget::~QgsStatusBarScaleWidget()
{
}

void QgsStatusBarScaleWidget::setScale( double scale )
{
  mScale->blockSignals( true );
  mScale->setScale( scale );
  mScale->blockSignals( false );
}

bool QgsStatusBarScaleWidget::isLocked() const
{
  return mLockButton->isChecked();
}

void QgsStatusBarScaleWidget::setFont( const QFont &font )
{
  mLabel->setFont( font );
  mScale->lineEdit()->setFont( font );
}

void QgsStatusBarScaleWidget::updateScales( const QStringList &scales )
{
  mScale->updateScales( scales );
}

void QgsStatusBarScaleWidget::userScale() const
{
  // Why has MapCanvas the scale inverted?
  mMapCanvas->zoomScale( 1.0 / mScale->scale() );
}