/*
   This file is part of the KDE project
   Copyright (C) 2004 Michael Brade <brade@kde.org>

   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.

   This program 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 for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.

   In addition, as a special exception, the copyright holders give
   permission to link the code of this program with any edition of
   the TQt library by Trolltech AS, Norway (or with modified versions
   of TQt that use the same license as TQt), and distribute linked
   combinations including the two.  You must obey the GNU General
   Public License in all respects for all of the code used other than
   TQt.  If you modify this file, you may extend this exception to
   your version of the file, but you are not obligated to do so.  If
   you do not wish to do so, delete this exception statement from
   your version.
*/

#include <tqtooltip.h>
#include <tqlayout.h>
#include <tqtextedit.h>

#include <kapplication.h>
#include <kglobalsettings.h>

#include "knotetip.h"
#include "knotes_part_p.h"


KNoteTip::KNoteTip( KIconView *parent )
  : TQFrame( 0, 0, WX11BypassWM |   // this will make Seli happy >:-P
            WStyle_Customize | WStyle_NoBorder | WStyle_Tool | WStyle_StaysOnTop ),
    mFilter( false ),
    mView( parent ),
    mNoteIVI( 0 ),
    mPreview( new TQTextEdit( this ) )
{
  mPreview->setReadOnly( true );
  mPreview->setHScrollBarMode( TQScrollView::AlwaysOff );
  mPreview->setVScrollBarMode( TQScrollView::AlwaysOff );

  TQBoxLayout *layout = new TQVBoxLayout( this );
  layout->addWidget( mPreview );

  setPalette( TQToolTip::palette() );
  setMargin( 1 );
  setFrameStyle( TQFrame::Plain | TQFrame::Box );
  hide();
}

KNoteTip::~KNoteTip()
{
  delete mPreview;
  mPreview = 0;
}

void KNoteTip::setNote( KNotesIconViewItem *item )
{
  if ( mNoteIVI == item )
    return;

  mNoteIVI = item;

  if ( !mNoteIVI ) {
    TQT_TQOBJECT(this)->killTimers();
    if ( isVisible() ) {
      setFilter( false );
      hide();
    }
  } else {
    KCal::Journal *journal = item->journal();
    if ( journal->customProperty( "KNotes", "RichText" ) == "true" )
      mPreview->setTextFormat( TQt::RichText );
    else
      mPreview->setTextFormat( TQt::PlainText );

    TQColor fg( journal->customProperty( "KNotes", "FgColor" ) );
    TQColor bg( journal->customProperty( "KNotes", "BgColor" ) );
    setColor( fg, bg );

    mPreview->setText( journal->description() );
    mPreview->zoomTo( 8 );
    mPreview->sync();

    int w = 400;
    int h = mPreview->heightForWidth( w );
    while ( w > 60 && h == mPreview->heightForWidth( w - 20 ) )
        w -= 20;

    TQRect desk = KGlobalSettings::desktopGeometry( mNoteIVI->rect().center() );
    resize( w, TQMIN( h, desk.height() / 2 - 20 ) );

    hide();
    TQT_TQOBJECT(this)->killTimers();
    setFilter( true );
    startTimer( 600 );  // delay showing the tooltip for 0.7 sec
  }
}


// protected, virtual methods

void KNoteTip::resizeEvent( TQResizeEvent *ev )
{
  TQFrame::resizeEvent( ev );
  reposition();
}

void KNoteTip::timerEvent( TQTimerEvent * )
{
  TQT_TQOBJECT(this)->killTimers();

  if ( !isVisible() ) {
    startTimer( 15000 ); // show the tooltip for 15 sec
    reposition();
    show();
  } else {
    setFilter( false );
    hide();
  }
}

bool KNoteTip::eventFilter( TQObject *, TQEvent *e )
{
  switch ( e->type() ) {
    case TQEvent::Leave:
    case TQEvent::MouseButtonPress:
    case TQEvent::MouseButtonRelease:
    case TQEvent::KeyPress:
    case TQEvent::KeyRelease:
    case TQEvent::FocusIn:
    case TQEvent::FocusOut:
    case TQEvent::Wheel:
      TQT_TQOBJECT(this)->killTimers();
      setFilter( false );
      hide();
    default:
      break;
  }

  return false;
}


// private stuff

void KNoteTip::setColor( const TQColor &fg, const TQColor &bg )
{
  TQPalette newpalette = palette();
  newpalette.setColor( TQColorGroup::Background, bg );
  newpalette.setColor( TQColorGroup::Foreground, fg );
  newpalette.setColor( TQColorGroup::Base,       bg ); // text background
  newpalette.setColor( TQColorGroup::Text,       fg ); // text color
  newpalette.setColor( TQColorGroup::Button,     bg );

  // the shadow
  newpalette.setColor( TQColorGroup::Midlight, bg.light(110) );
  newpalette.setColor( TQColorGroup::Shadow, bg.dark(116) );
  newpalette.setColor( TQColorGroup::Light, bg.light(180) );
  newpalette.setColor( TQColorGroup::Dark, bg.dark(108) );
  setPalette( newpalette );

  // set the text color
  mPreview->setColor( fg );
}


void KNoteTip::setFilter( bool enable )
{
  if ( enable == mFilter )
    return;

  if ( enable ) {
    kapp->installEventFilter( this );
    TQApplication::setGlobalMouseTracking( true );
  } else {
    TQApplication::setGlobalMouseTracking( false );
    kapp->removeEventFilter( this );
  }

  mFilter = enable;
}

void KNoteTip::reposition()
{
  if ( !mNoteIVI )
    return;

  TQRect rect = mNoteIVI->rect();
  TQPoint off = mView->mapToGlobal( mView->contentsToViewport( TQPoint( 0, 0 ) ) );
  rect.moveBy( off.x(), off.y() );

  TQPoint pos = rect.center();

  // should the tooltip be shown to the left or to the right of the ivi?
  TQRect desk = KGlobalSettings::desktopGeometry( pos );
  if ( rect.center().x() + width() > desk.right() ) {
    // to the left
    if ( pos.x() - width() < 0 )
        pos.setX( 0 );
    else
        pos.setX( pos.x() - width() );
  }

  // should the tooltip be shown above or below the ivi ?
  if ( rect.bottom() + height() > desk.bottom() ) {
    // above
    pos.setY( rect.top() - height() );
  } else
    pos.setY( rect.bottom() );

  move( pos );
  update();
}