/**********************************************************************
** Copyright (C) 2002 Trolltech AS.  All rights reserved.
**
** This file is part of Qt Designer.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "qcategorywidget.h"
#include <qtoolbutton.h>
#include <qtoolbar.h>
#include <qlayout.h>
#include <qscrollview.h>
#include <qpainter.h>
#include <qstyle.h>
#include <qobjectlist.h>
#include <qapplication.h>
#include <qiconset.h>
#include <qwidgetlist.h>
#include <kdebug.h>
#include <ktoolbar.h>
#include <qcursor.h>
#include <kpopupmenu.h>


class QCategoryButton : public QToolButton
{
public:
	QCategoryButton( QWidget *parent, const char *name ) :
			QToolButton( parent, name ), selected( FALSE )
	{ setBackgroundMode( PaletteLight ); }

	void setSelected( bool b ) { selected = b; update(); }
	friend class QCategoryWidget;

protected:
	void drawButton( QPainter * );
	QIconSet s_iconSet;
	QIconSet u_iconSet;
private:
	bool selected;

};

void QCategoryButton::drawButton( QPainter *p )
{
	const QPixmap & spic = s_iconSet.pixmap();
	const QPixmap & upic = u_iconSet.pixmap();
	int x = 2;
	if( selected ){
		if ( !spic.isNull() )
			x = spic.width() + 4;
	}
	else{
		if ( !upic.isNull() )
			x = upic.width() + 4;
	}
	if ( selected ) {
		QFont f( p->font() );
		f.setBold( TRUE );
		p->setFont( f );
	}
	int d = 20 + height() - 3;
	QPointArray a( 7 );
	a.setPoint( 0, -1, height() + 1 );
	a.setPoint( 1, -1, 1 );
	a.setPoint( 2, width() - d, 1 );
	a.setPoint( 3, width() - 20, height() - 2 );
	a.setPoint( 4, width() - 1, height() - 2 );
	a.setPoint( 5, width() - 1, height() + 1 );
	a.setPoint( 6, -1, height() + 1 );
	if ( selected )
		p->setBrush( colorGroup().light() );
	else
		p->setBrush( colorGroup().brush( QColorGroup::Background ) );
	p->setPen( colorGroup().mid().dark( 150 ) );
	p->drawPolygon( a );
	p->setPen( colorGroup().light() );
	p->drawLine( 0, 2, width() - d, 2 );
	p->drawLine( width() - d - 1, 2, width() - 21, height() - 1 );
	p->drawLine( width() - 20, height() - 1, width(), height() - 1 );
	p->setBrush( NoBrush );
	if( selected ){
		if ( !spic.isNull() )
			p->drawPixmap( 0, 6, spic );
	}
	else{
		if ( !upic.isNull() )
			p->drawPixmap( 0, 6, upic );
	}
	p->setPen( colorGroup().buttonText() );
	if ( p->fontMetrics().width( text() ) < width() - d - 5 ) {
		p->drawText( x, 2, width(), height() - 2, AlignVCenter | AlignLeft, text() );
	} else {
		QString s = text().left( 1 );
		int ew = p->fontMetrics().width( "..." );
		int i = 1;
		while ( p->fontMetrics().width( s ) + ew + p->fontMetrics().width( text() [ i ] ) < width() - d - 5 )
			s += text() [ i++ ];
		s += "...";
		p->drawText( x, 2, width(), height() - 2, AlignVCenter | AlignLeft, s );
	}
}


QCategoryWidget::QCategoryWidget( QWidget *parent, const char *name )
		: QWidget( parent, name )
{
	currentPage = 0;
	currentChild = 0;
	lastTab = 0;
	layout = new QVBoxLayout( this );
	buttons = new QWidgetList;
}

QCategoryWidget::~QCategoryWidget()
{
	delete buttons;
}

static void set_background_mode( QWidget *top, Qt::BackgroundMode bm )
{
	QObjectList * l = top->queryList( "QWidget" );
	l->append( top );
	for ( QObject * o = l->first(); o; o = l->next() )
		( ( QWidget* ) o ) ->setBackgroundMode( bm );
	delete l;
}

void QCategoryWidget::addCategory( const QString &name, QWidget *page, KPopupMenu *contextMenu, const QIconSet &sicon, const QIconSet &uicon )
{
	page->setBackgroundMode( PaletteBackground );
	QCategoryButton *button = new QCategoryButton( this, name.latin1() );
	button->s_iconSet = sicon;
	button->u_iconSet = uicon;
	buttons->append( button );
	button->setText( name );
	button->setFixedHeight( button->sizeHint().height() );
	context.insert( button, contextMenu );
	connect( button, SIGNAL( clicked() ), this, SLOT( buttonClicked() ) );
	QScrollView *sv = new QScrollView( this );
	sv->setResizePolicy( QScrollView::AutoOneFit );
	sv->addChild( page );
	sv->setFrameStyle( QFrame::NoFrame );
	page->show();
	pages.insert( button, sv );
	childs.insert( button, page );
	layout->addWidget( button );
	layout->addWidget( sv );
	button->show();
	if ( pages.count() == 1 ) {
		currentPage = sv;
		currentChild = page;
		lastTab = button;
		lastTab->setSelected( TRUE );
		sv->show();
		set_background_mode( currentPage, PaletteLight );
	} else {
		sv->hide();
	}
	updateTabs();
}

void QCategoryWidget::buttonClicked()
{
	QCategoryButton * tb = ( QCategoryButton* ) sender();
	QWidget *page = pages.find( tb );
	if ( !page || currentPage == page ){
		KPopupMenu *contextMenu = (KPopupMenu*)context.find( tb );
		contextMenu->exec(QCursor::pos());
		return ;
	}
	currentChild = childs.find( tb );
	tb->setSelected( TRUE );
	if ( lastTab )
		lastTab->setSelected( FALSE );
	lastTab = tb;
	if ( currentPage )
		currentPage->hide();
	currentPage = page;
	currentPage->show();
	set_background_mode( currentPage, PaletteLight );
	updateTabs();
}

void QCategoryWidget::updateTabs()
{
	bool after = FALSE;
	for ( QWidget * w = buttons->first(); w; w = buttons->next() ) {
		w->setBackgroundMode( !after ? PaletteBackground : PaletteLight );
		w->update();
		after = w == lastTab;
	}
}
/**/
void QCategoryWidget::showEvent( QShowEvent *e )
{
	if ( currentPage != 0 ) {
		QWidget::showEvent( e );
		currentPage->hide();  // ### this doesn't receive the showNormal signal, Bug in QT3.1 ?
		currentPage->show(); // calling hide() / show() fix the problem with the QActions
		set_background_mode( currentPage, PaletteLight );
		updateTabs();
	}
}
/**/
void QCategoryWidget::cleanUp( )
{
	currentPage = 0;
	lastTab = 0;
	buttons->clear();

	/*  for ( QWidget *w = buttons->first(); w; w = buttons->next() ) {
		delete w;
	    }*/ 
	//  delete buttons;
	//  buttons = new QWidgetList;
	pages.clear();
	delete layout;
	layout = new QVBoxLayout( this );

}
/**/
void QCategoryWidget::resizeEvent( QResizeEvent *e )
{
	if ( currentPage != 0 ) {
		currentChild->resize( e->size().width() , currentChild->height() );
		( ( QScrollView* ) currentPage ) ->resizeContents( e->size().width(), currentChild->height() );
		currentChild->update();
		currentPage->update();
	}
}

/* return the current selected group text */
QString QCategoryWidget::groupLabel()
{
	return lastTab->text();
}

/* changes the current group label to */
void QCategoryWidget::setGroupLabel( QString text )
{
	lastTab->setText( text );
	update();
}
void QCategoryWidget::removeCategory( )
{
	if( currentPage != 0 )
	{
		pages.remove( lastTab );
		childs.remove( lastTab);
		context.remove( lastTab );
		buttons->remove( lastTab );
		lastTab->hide();
		delete lastTab;
		currentPage->hide();
		delete currentPage;
		currentChild->hide();
		delete currentChild;
		lastTab =0;
		currentPage =0;
		currentChild =0;
	}
}