// krazy:excludeall=qclasses

//////////////////////////////////////////////////////////////////////////////
// oxygenlineeditdata.cpp
// data container for QLineEdit transition
// -------------------
//
// Copyright (c) 2009 Hugo Pereira Da Costa <hugo@oxygen-icons.org>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//////////////////////////////////////////////////////////////////////////////

#include "oxygenlineeditdata.h"
#include "oxygenlineeditdata.moc"

#include <QtCore/QEvent>
#include <QtCore/QTextStream>
#include <QtGui/QDateTimeEdit>
#include <QtGui/QDoubleSpinBox>
#include <QtGui/QPainter>
#include <QtGui/QSpinBox>
#include <QtGui/QStyle>
#include <QtGui/QStyleOptionFrameV2>

namespace Oxygen
{

    // use 20 milliseconds for animation lock
    const int LineEditData::lockTime_ = 20;

    //______________________________________________________
    LineEditData::LineEditData( QObject* parent, QLineEdit* target, int duration ):
        TransitionData( parent, target, duration ),
        target_( target ),
        hasClearButton_( false ),
        edited_( false )
    {
        target_.data()->installEventFilter( this );

        checkClearButton();

        connect( target_.data(), SIGNAL( destroyed() ), SLOT( targetDestroyed() ) );
        connect( target_.data(), SIGNAL( textEdited( const QString& ) ), SLOT( textEdited( void ) ) );
        connect( target_.data(), SIGNAL( textChanged( const QString& ) ), SLOT( textChanged( void ) ) );

        /*
        Additional signal/slot connections depending on widget's parent.
        This is needed because parents sometime disable the textChanged signal of the embedded
        QLineEdit
        */
        if( qobject_cast<QSpinBox*>( target_.data()->parentWidget() ) ||qobject_cast<QDoubleSpinBox*>( target_.data()->parentWidget() ) )
        {

            connect( target_.data()->parentWidget(), SIGNAL( valueChanged( const QString& ) ), SLOT( textChanged( void ) ) );

        } else if( qobject_cast<QDateTimeEdit*>( target_.data()->parentWidget() ) ) {

            connect( target_.data()->parentWidget(), SIGNAL( dateTimeChanged ( const QDateTime & ) ), SLOT( textChanged( void ) ) );

        }

        // update cached pixmap on selection change
        connect( target_.data(), SIGNAL( selectionChanged() ), SLOT( selectionChanged() ) );

    }

    //___________________________________________________________________
    bool LineEditData::eventFilter( QObject* object, QEvent* event )
    {

        if( !( enabled() && object && object == target_.data() ) )
        { return TransitionData::eventFilter( object, event ); }

        switch ( event->type() )
        {
            case QEvent::Show:
            case QEvent::Resize:
            case QEvent::Move:
            if( !recursiveCheck() )
            {
                timer_.start( 0, this );
                break;
            }

            default: break;
        }

        return TransitionData::eventFilter( object, event );

    }

    //___________________________________________________________________
    void LineEditData::timerEvent( QTimerEvent* event )
    {
        if( event->timerId() == timer_.timerId() )
        {

            timer_.stop();
            checkClearButton();
            if( enabled() && transition() && target_ && target_.data()->isVisible() )
            {
                setRecursiveCheck( true );
                transition().data()->setEndPixmap( transition().data()->grab( target_.data(), targetRect() ) );
                setRecursiveCheck( false );
            }

        } else if( event->timerId() == animationLockTimer_.timerId() ) {

            unlockAnimations();

        } else return TransitionData::timerEvent( event );

    }

    //___________________________________________________________________
    void LineEditData::checkClearButton( void )
    {
        if( !target_ ) return;
        QObjectList children( target_.data()->children() );
        hasClearButton_ = false;
        foreach( QObject* child, children )
        {
            if( child->inherits( "KLineEditButton" ) )
            {
                hasClearButton_ = true;
                clearButtonRect_ = static_cast<QWidget*>(child)->geometry();
                break;
            }
        }

        return;
    }

    //___________________________________________________________________
    void LineEditData::textEdited( void )
    {
        edited_ = true;
        if( !recursiveCheck() )
        { timer_.start( 0, this ); }
    }


    //___________________________________________________________________
    void LineEditData::selectionChanged( void )
    {
        if( !recursiveCheck() )
        { timer_.start( 0, this ); }
    }

    //___________________________________________________________________
    void LineEditData::textChanged( void )
    {

        // check whether text change was triggered manually
        // in which case do not start transition
        if( edited_ )
        {
            edited_ = false;
            return;
        }

        if( transition().data()->isAnimated() )
        { transition().data()->endAnimation(); }

        if( isLocked() )
        {
            // if locked one do not start the new animation, to prevent flicker
            // instead, one hides the transition pixmap, trigger an update, and return.
            // animations are re-locked.
            transition().data()->hide();
            lockAnimations();
            timer_.start( 0, this );
            return;
        }

        if( initializeAnimation() )
        {

            lockAnimations();
            animate();

        } else {

            transition().data()->hide();

        }
    }

    //___________________________________________________________________
    bool LineEditData::initializeAnimation( void )
    {
        if( !( enabled() && target_ && target_.data()->isVisible() ) ) return false;

        if( recursiveCheck() ) return false;

        QRect current( targetRect() );

        transition().data()->setOpacity(0);
        transition().data()->setGeometry( current );

        if( widgetRect_.isValid() &&
            !transition().data()->currentPixmap().isNull() &&
            widgetRect_ != current )
        {

          // if label geometry has changed since last animation
          // one must clone the pixmap to make it match the right
          // geometry before starting the animation.
          QPixmap pixmap( current.size() );
          pixmap.fill( Qt::transparent );
          QPainter p( &pixmap );
          p.drawPixmap( widgetRect_.topLeft() - current.topLeft(), transition().data()->currentPixmap() );
          p.end();
          transition().data()->setStartPixmap( pixmap );

        } else {

            transition().data()->setStartPixmap( transition().data()->currentPixmap() );

        }

        bool valid( !transition().data()->startPixmap().isNull() );
        if( valid )
        {
            transition().data()->show();
            transition().data()->raise();
        }

        setRecursiveCheck( true );
        transition().data()->setEndPixmap( transition().data()->grab( target_.data(), targetRect() ) );
        setRecursiveCheck( false );

        return valid;

    }

    //___________________________________________________________________
    bool LineEditData::animate( void )
    {
        transition().data()->animate();
        return true;
    }

    //___________________________________________________________________
    void LineEditData::targetDestroyed( void )
    {
        setEnabled( false );
        target_.clear();
    }

}
