workspace/plasma/applets/system-monitor/monitorbutton.cpp

   1 /*
   2  *   Copyright (C) 2007 Petri Damsten <damu@iki.fi>
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU Library General Public License as
   6  *   published by the Free Software Foundation; either version 2, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details
  13  *
  14  *   You should have received a copy of the GNU Library General Public
  15  *   License along with this program; if not, write to the
  16  *   Free Software Foundation, Inc.,
  17  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include "monitorbutton.h"
  21
  22 #include <QIcon>
  23 #include <QPainter>
  24 #include <QTimeLine>
  25
  26 #include <KDebug>
  27 #include <KIcon>
  28 #include <KPushButton>
  29
  30 #include <Plasma/PaintUtils>
  31
  32 #define MARGIN 2
  33
  34 class MonitorButton::Private
  35 {
  36 public:
  37     Private() : imageSize(32, 32)
  38     {
  39     }
  40
  41     QSize imageSize;
  42     QString image;
  43     KIcon icon;
  44     QTimeLine highlighter;
  45 };
  46
  47 MonitorButton::MonitorButton(QGraphicsWidget *parent) :
  48         Plasma::PushButton(parent),
  49         d(new Private)
  50 {
  51    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
  52    setPreferredSize(d->imageSize.width() + 2 * MARGIN, d->imageSize.height() + 2 * MARGIN);
  53
  54    d->highlighter.setDuration(100);
  55    d->highlighter.setFrameRange(0, 10);
  56    d->highlighter.setCurveShape(QTimeLine::EaseInCurve);
  57    connect(&d->highlighter, SIGNAL(valueChanged(qreal)), this, SLOT(highlight()));
  58 }
  59
  60 MonitorButton::~MonitorButton()
  61 {
  62     delete d;
  63 }
  64
  65 QString MonitorButton::image() const
  66 {
  67     return d->image;
  68 }
  69
  70 void MonitorButton::setImage(const QString &image)
  71 {
  72     d->image = image;
  73     d->icon = KIcon(image);
  74     update();
  75 }
  76
  77 void MonitorButton::highlight()
  78 {
  79     update();
  80 }
  81
  82 void MonitorButton::hoverEnterEvent(QGraphicsSceneHoverEvent * event)
  83 {
  84     if (nativeWidget()->isChecked()) {
  85         return;
  86     }
  87
  88     d->highlighter.setDirection(QTimeLine::Forward);
  89     d->highlighter.start();
  90 }
  91
  92 void MonitorButton::hoverLeaveEvent(QGraphicsSceneHoverEvent * event)
  93 {
  94     if (nativeWidget()->isChecked()) {
  95         return;
  96     }
  97
  98     d->highlighter.setDirection(QTimeLine::Backward);
  99     d->highlighter.start();
 100 }
 101
 102 void MonitorButton::paint(QPainter *p,
 103                           const QStyleOptionGraphicsItem *option,
 104                           QWidget *widget)
 105 {
 106     Q_UNUSED(option)
 107     Q_UNUSED(widget)
 108
 109     QIcon::Mode mode = QIcon::Disabled;
 110     if (nativeWidget()->isChecked()) {
 111         mode = QIcon::Normal;
 112     }
 113
 114     QPixmap icon = Plasma::PaintUtils::transition(d->icon.pixmap(d->imageSize, QIcon::Disabled),
 115                                                   d->icon.pixmap(d->imageSize, QIcon::Normal),
 116                                                   nativeWidget()->isChecked() ? 1 : d->highlighter.currentValue());
 117     p->drawPixmap(QPointF((size().width() - d->imageSize.width()) / 2,
 118                         (size().height() - d->imageSize.height()) / 2),
 119                   icon);
 120 }
 121
 122 #include "monitorbutton.moc"