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karrowbutton.cpp

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00001 /* This file is part of the KDE libraries
00002      Copyright (C) 2001 Frerich Raabe <raabe@kde.org>
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License version 2 as published by the Free Software Foundation.
00007 
00008    This library is distributed in the hope that it will be useful,
00009    but WITHOUT ANY WARRANTY; without even the implied warranty of
00010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00011    Library General Public License for more details.
00012 
00013    You should have received a copy of the GNU Library General Public License
00014    along with this library; see the file COPYING.LIB.  If not, write to
00015    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00016    Boston, MA 02110-1301, USA.
00017 */
00018 
00019 #include "karrowbutton.h"
00020 
00021 #include <QStyle>
00022 #include <QStyleOptionFrame>
00023 #include <QPainter>
00024 
00025 #include <assert.h>
00026 
00027 class KArrowButtonPrivate
00028 {
00029     public:
00030         Qt::ArrowType arrow;
00031 };
00032 
00033 KArrowButton::KArrowButton(QWidget *parent, Qt::ArrowType arrow)
00034     : QPushButton(parent),d(new KArrowButtonPrivate())
00035 {
00036     d->arrow = arrow;
00037 }
00038 
00039 KArrowButton::~KArrowButton()
00040 {
00041     delete d;
00042 }
00043 
00044 QSize KArrowButton::sizeHint() const
00045 {
00046     return QSize( 12, 12 );
00047 }
00048 
00049 void KArrowButton::setArrowType(Qt::ArrowType a)
00050 {
00051     if (d->arrow != a) {
00052         d->arrow = a;
00053         repaint();
00054     }
00055 }
00056 Qt::ArrowType KArrowButton::arrowType() const
00057 {
00058     return d->arrow;
00059 }
00060 
00061 void KArrowButton::paintEvent(QPaintEvent*)
00062 {
00063     QPainter p(this);
00064     const unsigned int arrowSize = 8;
00065     const unsigned int margin = 2;
00066 
00067     QStyleOptionFrame opt;
00068     opt.init(this);
00069     opt.lineWidth    = 2;
00070     opt.midLineWidth = 0;
00071 
00072     p.fillRect( rect(), palette().brush( QPalette::Background ) );
00073 
00074     style()->drawPrimitive( QStyle::PE_Frame, &opt, &p, this);
00075 
00076     if (d->arrow == Qt::NoArrow)
00077         return;
00078 
00079     if (static_cast<unsigned int>(width()) < arrowSize + margin ||
00080         static_cast<unsigned int>(height()) < arrowSize + margin)
00081         return; // don't draw arrows if we are too small
00082 
00083     unsigned int x = 0, y = 0;
00084     if (d->arrow == Qt::DownArrow) {
00085         x = (width() - arrowSize) / 2;
00086         y = height() - (arrowSize + margin);
00087     } else if (d->arrow == Qt::UpArrow) {
00088         x = (width() - arrowSize) / 2;
00089         y = margin;
00090     } else if (d->arrow == Qt::RightArrow) {
00091         x = width() - (arrowSize + margin);
00092         y = (height() - arrowSize) / 2;
00093     } else { // arrowType == LeftArrow
00094         x = margin;
00095         y = (height() - arrowSize) / 2;
00096     }
00097 
00098     if (isDown()) {
00099         x++;
00100         y++;
00101     }
00102 
00103     QStyle::PrimitiveElement e = QStyle::PE_IndicatorArrowLeft;
00104     switch (d->arrow)
00105     {
00106         case Qt::LeftArrow: e = QStyle::PE_IndicatorArrowLeft; break;
00107         case Qt::RightArrow: e = QStyle::PE_IndicatorArrowRight; break;
00108         case Qt::UpArrow: e = QStyle::PE_IndicatorArrowUp; break;
00109         case Qt::DownArrow: e = QStyle::PE_IndicatorArrowDown; break;
00110         case Qt::NoArrow: assert( 0 ); break;
00111     }
00112 
00113     opt.state |= QStyle::State_Enabled;
00114     opt.rect   = QRect( x, y, arrowSize, arrowSize);
00115 
00116     style()->drawPrimitive( e, &opt, &p, this );
00117 }
00118 
00119 #include "karrowbutton.moc"

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