source: trunk/examples/demo/dnd/styledbutton.cpp@ 184

/**********************************************************************
** Copyright (C) 2000 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 "styledbutton.h"

#include <qcolordialog.h>
#include <qpalette.h>
#include <qlabel.h>
#include <qpainter.h>
#include <qimage.h>
#include <qpixmap.h>
#include <qapplication.h>
#include <qdragobject.h>
#include <qstyle.h>

StyledButton::StyledButton(QWidget* parent, const char* name)
    : QButton( parent, name ), pix( 0 ), spix( 0 ), edit( ColorEditor ), s( 0 ), mousePressed( FALSE )
{
    setMinimumSize( minimumSizeHint() );
    setAcceptDrops( TRUE );

    connect( this, SIGNAL(clicked()), SLOT(onEditor()));
}

StyledButton::StyledButton( const QBrush& b, QWidget* parent, const char* name, WFlags f )
    : QButton( parent, name, f ), spix( 0 ), s( 0 )
{
    col = b.color();
    pix = b.pixmap();
    setMinimumSize( minimumSizeHint() );
}

StyledButton::~StyledButton()
{
    if ( pix ) {
        delete pix;
        pix = 0;
    }
    if ( spix ) {
        delete spix;
        spix = 0;
    }
}

void StyledButton::setEditor( EditorType e )
{
    if ( edit == e )
        return;

    edit = e;
    update();
}

StyledButton::EditorType StyledButton::editor() const
{
    return edit;
}

void StyledButton::setColor( const QColor& c )
{
    col = c;
    update();
}

void StyledButton::setPixmap( const QPixmap & pm )
{
    if ( !pm.isNull() ) {
        delete pix;
        pix = new QPixmap( pm );
    } else {
        delete pix;
        pix = 0;
    }
    scalePixmap();
}

QColor StyledButton::color() const
{
    return col;
}

QPixmap* StyledButton::pixmap() const
{
    return pix;
}

bool StyledButton::scale() const
{
    return s;
}

void StyledButton::setScale( bool on )
{
    if ( s == on )
        return;

    s = on;
    scalePixmap();
}

QSize StyledButton::sizeHint() const
{
    return QSize( 50, 25 );
}

QSize StyledButton::minimumSizeHint() const
{
    return QSize( 50, 25 );
}

void StyledButton::scalePixmap()
{
    delete spix;

    if ( pix ) {
        spix = new QPixmap( 6*width()/8, 6*height()/8 );
        QImage img = pix->convertToImage();

        spix->convertFromImage( s? img.smoothScale( 6*width()/8, 6*height()/8 ) : img );
    } else {
        spix = 0;
    }

    update();
}

void StyledButton::resizeEvent( QResizeEvent* e )
{
    scalePixmap();
    QButton::resizeEvent( e );
}

void StyledButton::drawButton( QPainter *paint )
{
    style().drawPrimitive(QStyle::PE_ButtonBevel, paint, rect(), colorGroup(),
                          isDown() ? QStyle::Style_Sunken : QStyle::Style_Default);
    drawButtonLabel(paint);

    if (hasFocus())
        style().drawPrimitive(QStyle::PE_FocusRect, paint,
                              style().subRect(QStyle::SR_PushButtonFocusRect, this),
                              colorGroup(), QStyle::Style_Default);
}

void StyledButton::drawButtonLabel( QPainter *paint )
{
    QColor pen = isEnabled() ?
                 hasFocus() ? palette().active().buttonText() : palette().inactive().buttonText()
                 : palette().disabled().buttonText();
    paint->setPen( pen );

    if(!isEnabled()) {
        paint->setBrush( QBrush( colorGroup().button() ) );
    }
    else if ( edit == PixmapEditor && spix ) {
        paint->setBrush( QBrush( col, *spix ) );
        paint->setBrushOrigin( width()/8, height()/8 );
    } else
        paint->setBrush( QBrush( col ) );

    paint->drawRect( width()/8, height()/8, 6*width()/8, 6*height()/8 );
}

void StyledButton::onEditor()
{
    switch (edit) {
    case ColorEditor: {
        QColor c = QColorDialog::getColor( palette().active().background(), this );
        if ( c.isValid() ) {
            setColor( c );
            emit changed();
        }
    } break;
    case PixmapEditor: {
        QPixmap p;
        /*
        if ( pixmap() )
                p = qChoosePixmap( this,*pixmap() );
        else
                p = qChoosePixmap( this, QPixmap() );
        if ( !p.isNull() ) {
            setPixmap( p );
            emit changed();
        }
        */
    } break;
    default:
        break;
    }
}

void StyledButton::mousePressEvent(QMouseEvent* e)
{
    QButton::mousePressEvent(e);
    mousePressed = TRUE;
    pressPos = e->pos();
}

void StyledButton::mouseMoveEvent(QMouseEvent* e)
{
    QButton::mouseMoveEvent( e );
#ifndef QT_NO_DRAGANDDROP
    if ( !mousePressed )
        return;
    if ( ( pressPos - e->pos() ).manhattanLength() > QApplication::startDragDistance() ) {
        if ( edit == ColorEditor ) {
            QColorDrag *drg = new QColorDrag( col, this );
            QPixmap pix( 25, 25 );
            pix.fill( col );
            QPainter p( &pix );
            p.drawRect( 0, 0, pix.width(), pix.height() );
            p.end();
            drg->setPixmap( pix );
            mousePressed = FALSE;
            drg->dragCopy();
        }
        else if ( edit == PixmapEditor && pix && !pix->isNull() ) {
            QImage img = pix->convertToImage();
            QImageDrag *drg = new QImageDrag( img, this );
            if(spix)
                drg->setPixmap( *spix );
            mousePressed = FALSE;
            drg->dragCopy();
        }
    }
#endif
}

#ifndef QT_NO_DRAGANDDROP
void StyledButton::dragEnterEvent( QDragEnterEvent *e )
{
    setFocus();
    if ( edit == ColorEditor && QColorDrag::canDecode( e ) )
        e->accept();
    else if ( edit == PixmapEditor && QImageDrag::canDecode( e ) )
        e->accept();
    else
        e->ignore();
}

void StyledButton::dragLeaveEvent( QDragLeaveEvent * )
{
    if ( hasFocus() )
        parentWidget()->setFocus();
}

void StyledButton::dragMoveEvent( QDragMoveEvent *e )
{
    if ( edit == ColorEditor && QColorDrag::canDecode( e ) )
        e->accept();
    else if ( edit == PixmapEditor && QImageDrag::canDecode( e ) )
        e->accept();
    else
        e->ignore();
}

void StyledButton::dropEvent( QDropEvent *e )
{
    if ( edit == ColorEditor && QColorDrag::canDecode( e ) ) {
        QColor color;
        QColorDrag::decode( e, color );
        setColor(color);
        emit changed();
        e->accept();
    }
    else if ( edit == PixmapEditor && QImageDrag::canDecode( e ) ) {
        QImage img;
        QImageDrag::decode( e, img );
        QPixmap pm;
        pm.convertFromImage(img);
        setPixmap(pm);
        emit changed();
        e->accept();
    } else {
        e->ignore();
    }
}
#endif // QT_NO_DRAGANDDROP