//////////////////////////////////////////////////////////////////////////////
// oxygensizegrip.cpp
// -------------------
//
// Copyright (c) 2009 Hugo Pereira Da Costa <hugo.pereira@free.fr>
//
// 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 "oxygensizegrip.h"
#include "oxygenbutton.h"
#include "oxygenclient.h"

#include <cassert>
#include <QtGui/QPainter>
#include <QtGui/QPolygon>
#include <QtCore/QTimer>

#include <QtGui/QX11Info>
#include <X11/Xlib.h>

namespace Oxygen
{

  //_____________________________________________
  OxygenSizeGrip::OxygenSizeGrip( OxygenClient* client ):
    QWidget(0),
    client_( client )
  {

    setAttribute(Qt::WA_NoSystemBackground );
    setAutoFillBackground( false );

    // cursor
    setCursor( Qt::SizeFDiagCursor );

    // size
    setFixedSize( QSize( GRIP_SIZE, GRIP_SIZE ) );

    // mask
    QPolygon p;
    p << QPoint( 0, GRIP_SIZE )
      << QPoint( GRIP_SIZE, 0 )
      << QPoint( GRIP_SIZE, GRIP_SIZE )
      << QPoint( 0, GRIP_SIZE );

    setMask( QRegion( p ) );

    // embed
    embed();
    updatePosition();

    // event filter
    client->widget()->installEventFilter( this );

    // show
    show();

  }

  //_____________________________________________
  OxygenSizeGrip::~OxygenSizeGrip( void )
  {}

  //_____________________________________________
  void OxygenSizeGrip::activeChange( void )
  { XMapRaised( QX11Info::display(), winId() ); }

  //_____________________________________________
  void OxygenSizeGrip::embed( void )
  {

    WId window_id = client().windowId();
    if( client().isPreview() ) {

      setParent( client().widget() );

    } else if( window_id ) {

      WId current = window_id;
      while( true )
      {
        WId root, parent = 0;
        WId *children = 0L;
        uint child_count = 0;
        XQueryTree(QX11Info::display(), current, &root, &parent, &children, &child_count);
        if( parent && parent != root && parent != current ) current = parent;
        else break;
      }

      // reparent
      XReparentWindow( QX11Info::display(), winId(), current, 0, 0 );
    } else {

      hide();

    }

  }

  //_____________________________________________
  bool OxygenSizeGrip::eventFilter( QObject* object, QEvent* event )
  {

    if( object != client().widget() ) return false;
    if ( event->type() == QEvent::Resize) updatePosition();
    return false;

  }

  //_____________________________________________
  void OxygenSizeGrip::paintEvent( QPaintEvent* )
  {

    // get relevant colors
    QColor base( client().backgroundColor( this, palette(), client().isActive() ) );
    QColor light( client().helper().calcDarkColor( base ) );
    QColor dark( client().helper().calcDarkColor( base.darker(150) ) );

    // create and configure painter
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing );

    painter.setPen( Qt::NoPen );
    painter.setBrush( base );

    // polygon
    QPolygon p;
    p << QPoint( 0, GRIP_SIZE )
      << QPoint( GRIP_SIZE, 0 )
      << QPoint( GRIP_SIZE, GRIP_SIZE )
      << QPoint( 0, GRIP_SIZE );
    painter.drawPolygon( p );

    // diagonal border
    painter.setBrush( Qt::NoBrush );
    painter.setPen( QPen( dark, 3 ) );
    painter.drawLine( QPoint( 0, GRIP_SIZE ), QPoint( GRIP_SIZE, 0 ) );

    // side borders
    painter.setPen( QPen( light, 1.5 ) );
    painter.drawLine( QPoint( 1, GRIP_SIZE ), QPoint( GRIP_SIZE, GRIP_SIZE ) );
    painter.drawLine( QPoint( GRIP_SIZE, 1 ), QPoint( GRIP_SIZE, GRIP_SIZE ) );
    painter.end();

  }

  //_____________________________________________
  void OxygenSizeGrip::mousePressEvent( QMouseEvent* event )
  {

    switch (event->button())
    {

      case Qt::RightButton:
      {
        hide();
        QTimer::singleShot(5000, this, SLOT(show()));
        break;
      }

      case Qt::MidButton:
      {
        hide();
        break;
      }

      case Qt::LeftButton:
      if( rect().contains( event->pos() ) )
      {

        // check client window id
        if( !client().windowId() ) break;
        client().widget()->setFocus();
        if( client().decoration() )
        { client().decoration()->performWindowOperation( KDecorationDefines::ResizeOp ); }

      }
      break;

      default: break;

    }

    return;

  }

  //_______________________________________________________________________________
  void OxygenSizeGrip::updatePosition( void )
  {

    QPoint position(
      client().width() - GRIP_SIZE - OFFSET,
      client().height() - GRIP_SIZE - OFFSET );

    if( client().isPreview() )
    {

      position -= QPoint(
        client().layoutMetric( OxygenClient::LM_BorderRight )+
        client().layoutMetric( OxygenClient::LM_OuterPaddingRight ),
        client().layoutMetric( OxygenClient::LM_OuterPaddingBottom )+
        client().layoutMetric( OxygenClient::LM_BorderBottom )
        );

    } else {

      position -= QPoint(
        client().layoutMetric( OxygenClient::LM_BorderRight ),
        client().layoutMetric( OxygenClient::LM_BorderBottom ) );
    }

    move( position );

  }

}
