//##################################################################################################
//
//   Custom Visualization Core library
//   Copyright (C) 2011-2013 Ceetron AS
//
//   This library may be used under the terms of either the GNU General Public License or
//   the GNU Lesser General Public License as follows:
//
//   GNU General Public License Usage
//   This library 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 3 of the License, or
//   (at your option) any later version.
//
//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
//   FITNESS FOR A PARTICULAR PURPOSE.
//
//   See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
//   for more details.
//
//   GNU Lesser General Public License Usage
//   This library is free software; you can redistribute it and/or modify
//   it under the terms of the GNU Lesser General Public License as published by
//   the Free Software Foundation; either version 2.1 of the License, or
//   (at your option) any later version.
//
//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
//   FITNESS FOR A PARTICULAR PURPOSE.
//
//   See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
//   for more details.
//
//##################################################################################################

#include "cafPdmUiPropertyView.h"

#include "cafPdmObject.h"
#include "cafPdmUiDefaultObjectEditor.h"

#include <QEvent>
#include <QHBoxLayout>
#include <QResizeEvent>
#include <QScrollArea>
#include <QScrollBar>
#include <QTimer>

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QVerticalScrollArea::QVerticalScrollArea( QWidget* parent )
    : QScrollArea( parent )
{
    setWidgetResizable( true );
    setHorizontalScrollBarPolicy( Qt::ScrollBarAsNeeded );
    setVerticalScrollBarPolicy( Qt::ScrollBarAsNeeded );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QSize QVerticalScrollArea::sizeHint() const
{
    QSize widgetSize = widget()->sizeHint();
    QSize scrollSize = QScrollArea::sizeHint();
    scrollSize.setWidth( widgetSize.width() + verticalScrollBar()->width() );

    return scrollSize;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QSize QVerticalScrollArea::minimumSizeHint() const
{
    QSize scrollSize = QScrollArea::minimumSizeHint();
    scrollSize.setWidth( 10 );

    return scrollSize;
}

namespace caf
{
//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
PdmUiPropertyView::PdmUiPropertyView( QWidget* parent, Qt::WindowFlags f )
    : QWidget( parent, f )
{
    m_scrollArea = new QVerticalScrollArea( this );
    m_scrollArea->setFrameStyle( QFrame::NoFrame );
    m_scrollArea->setWidgetResizable( true );

    m_placeholder = new QWidget();
    m_scrollArea->setWidget( m_placeholder );

    m_placeHolderLayout = new QVBoxLayout();
    m_placeHolderLayout->setContentsMargins( 5, 5, 5, 0 );
    m_placeholder->setLayout( m_placeHolderLayout );

    QVBoxLayout* dummy = new QVBoxLayout( this );
    dummy->setContentsMargins( 0, 0, 0, 0 );
    dummy->addWidget( m_scrollArea );

    m_defaultObjectEditor = nullptr;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
PdmUiPropertyView::~PdmUiPropertyView()
{
    if ( m_defaultObjectEditor ) delete m_defaultObjectEditor;
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiPropertyView::setUiConfigurationName( QString uiConfigName )
{
    // Reset everything, and possibly create widgets etc afresh
    if ( m_uiConfigName != uiConfigName )
    {
        m_uiConfigName = uiConfigName;

        if ( m_defaultObjectEditor )
        {
            PdmObjectHandle* object = m_defaultObjectEditor->pdmObject();
            delete m_defaultObjectEditor;
            m_defaultObjectEditor = nullptr;
            this->showProperties( object );
        }
    }
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
void PdmUiPropertyView::showProperties( PdmObjectHandle* object )
{
    // Find specialized object view handle

    // If the current ObjectView has the same type as the one to view, reuse, with Widget etc.

    bool rebuildWidget = false;

    if ( !m_defaultObjectEditor ) rebuildWidget = true;

    if ( m_defaultObjectEditor && m_defaultObjectEditor->pdmObject() )
    {
        if ( object )
        {
            PdmUiObjectHandle* uiObject1 = uiObj( m_defaultObjectEditor->pdmObject() );
            PdmUiObjectHandle* uiObject2 = uiObj( object );

            if ( uiObject1 && uiObject2 &&
                 ( uiObject1->uiEditorTypeName( m_uiConfigName ) != uiObject2->uiEditorTypeName( m_uiConfigName ) ) )
            {
                rebuildWidget = true;
            }
        }
    }

    if ( rebuildWidget )
    {
        // Remove Widget from layout
        if ( m_defaultObjectEditor )
        {
            this->m_placeHolderLayout->removeWidget( m_defaultObjectEditor->widget() );
            delete m_defaultObjectEditor;
            m_defaultObjectEditor = nullptr;
        }

        if ( !m_defaultObjectEditor )
        {
            m_defaultObjectEditor = new PdmUiDefaultObjectEditor();
        }

        // Create widget to handle this
        QWidget* propertyWidget = m_defaultObjectEditor->getOrCreateWidget( m_placeholder );

        CAF_ASSERT( propertyWidget );

        this->m_placeHolderLayout->insertWidget( 0, propertyWidget );

        // Add stretch to make sure the property widget is not stretched
        this->m_placeHolderLayout->insertStretch( -1, 1 );
    }

    m_defaultObjectEditor->setPdmObject( object );

    m_defaultObjectEditor->updateUi( m_uiConfigName );
    m_scrollArea->updateGeometry();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
PdmObjectHandle* PdmUiPropertyView::currentObject()
{
    if ( !m_defaultObjectEditor ) return nullptr;
    return m_defaultObjectEditor->pdmObject();
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QSize PdmUiPropertyView::sizeHint() const
{
    QSize scrollSize  = m_scrollArea->sizeHint();
    QSize contentSize = m_placeholder->sizeHint();
    return QSize( scrollSize.width(), contentSize.height() );
}

//--------------------------------------------------------------------------------------------------
///
//--------------------------------------------------------------------------------------------------
QSize PdmUiPropertyView::minimumSizeHint() const
{
    return m_scrollArea->minimumSizeHint();
}

} // End of namespace caf