workspace/plasma/shells/desktop/toolbutton.cpp

   1 /*
   2  *   Copyright 2008 Marco Martin <notmart@gmail.com>
   3  *   Copyright 2008 Aaron Seigo <aseigo@kde.org>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU Library General Public License as
   7  *   published by the Free Software Foundation; either version 2, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details
  14  *
  15  *   You should have received a copy of the GNU Library General Public
  16  *   License along with this program; if not, write to the
  17  *   Free Software Foundation, Inc.,
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20
  21 #include "toolbutton.h"
  22
  23 //Qt
  24 #include <QAction>
  25 #include <QPainter>
  26 #include <QPaintEvent>
  27 #include <QStyle>
  28 #include <QStyleOptionToolButton>
  29 #include <QGraphicsSceneHoverEvent>
  30
  31 //KDE
  32 #include <KColorUtils>
  33
  34 //Plasma
  35 #include <Plasma/PaintUtils>
  36 #include <Plasma/Theme>
  37 #include <Plasma/FrameSvg>
  38 #include <Plasma/Animator>
  39
  40 ToolButton::ToolButton(QWidget *parent)
  41     : QToolButton(parent),
  42       m_action(0),
  43       m_animationId(0),
  44       m_alpha(0),
  45       m_fadeIn(true)
  46 {
  47     m_background = new Plasma::FrameSvg(this);
  48     m_background->setImagePath("widgets/button");
  49     m_background->setCacheAllRenderedFrames(true);
  50     m_background->setElementPrefix("plain");
  51 }
  52
  53 void ToolButton::setAction(QAction *action)
  54 {
  55     if (!action) {
  56         return;
  57     }
  58
  59     if (m_action) {
  60         disconnect(m_action, SIGNAL(changed()), this, SLOT(syncToAction()));
  61         disconnect(this, SIGNAL(clicked()), m_action, SLOT(trigger()));
  62     }
  63
  64     m_action = action;
  65     connect(m_action, SIGNAL(changed()), this, SLOT(syncToAction()));
  66     connect(this, SIGNAL(clicked()), m_action, SLOT(trigger()));
  67     connect(m_action, SIGNAL(destroyed(QObject*)), this, SLOT(actionDestroyed(QObject*)));
  68     syncToAction();
  69 }
  70
  71 void ToolButton::syncToAction()
  72 {
  73     if (!m_action) {
  74         return;
  75     }
  76
  77     setIcon(m_action->icon());
  78     setText(m_action->text());
  79
  80     if (toolButtonStyle() == Qt::ToolButtonIconOnly) {
  81         setToolTip(m_action->text());
  82     }
  83
  84     setCheckable(m_action->isCheckable());
  85     if (m_action->actionGroup()) {
  86         setAutoExclusive(m_action->actionGroup()->isExclusive());
  87     }
  88
  89     setEnabled(m_action->isEnabled());
  90 }
  91
  92 void ToolButton::actionDestroyed(QObject *)
  93 {
  94     m_action = 0;
  95 }
  96
  97 void ToolButton::paintEvent(QPaintEvent *event)
  98 {
  99     Q_UNUSED(event)
 100
 101     QPainter painter(this);
 102
 103     QStyleOptionToolButton buttonOpt;
 104     initStyleOption(&buttonOpt);
 105
 106     if (m_animationId || (buttonOpt.state & QStyle::State_MouseOver) || (buttonOpt.state & QStyle::State_On)) {
 107         if (buttonOpt.state & QStyle::State_Sunken || (buttonOpt.state & QStyle::State_On)) {
 108             m_background->setElementPrefix("pressed");
 109         } else {
 110             m_background->setElementPrefix("normal");
 111         }
 112         m_background->resizeFrame(size());
 113
 114         if (m_animationId) {
 115             QPixmap buffer = m_background->framePixmap();
 116
 117             QPainter bufferPainter(&buffer);
 118             bufferPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
 119             QColor alphaColor(Qt::black);
 120             alphaColor.setAlphaF(qMin(qreal(0.95), m_alpha));
 121             bufferPainter.fillRect(buffer.rect(), alphaColor);
 122             bufferPainter.end();
 123
 124             painter.drawPixmap(QPoint(0,0), buffer);
 125
 126             buttonOpt.palette.setColor(QPalette::ButtonText, KColorUtils::mix(Plasma::Theme::defaultTheme()->color(Plasma::Theme::ButtonTextColor), Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor), 1-m_alpha));
 127         } else {
 128             m_background->paintFrame(&painter);
 129             buttonOpt.palette.setColor(QPalette::ButtonText, Plasma::Theme::defaultTheme()->color(Plasma::Theme::ButtonTextColor));
 130         }
 131
 132     } else {
 133         buttonOpt.palette.setColor(QPalette::ButtonText, Plasma::Theme::defaultTheme()->color(Plasma::Theme::TextColor));
 134     }
 135
 136     style()->drawControl(QStyle::CE_ToolButtonLabel, &buttonOpt, &painter, this);
 137 }
 138
 139 void ToolButton::enterEvent(QEvent *event)
 140 {
 141     if (isChecked()) {
 142         return;
 143     }
 144
 145     const int FadeInDuration = 75;
 146
 147     if (m_animationId) {
 148         Plasma::Animator::self()->stopElementAnimation(m_animationId);
 149     }
 150
 151     m_fadeIn = true;
 152     m_animationId = Plasma::Animator::self()->customAnimation(
 153         40 / (1000 / FadeInDuration), FadeInDuration,
 154         Plasma::Animator::LinearCurve, this, "animationUpdate");
 155 }
 156
 157 void ToolButton::leaveEvent(QEvent *event)
 158 {
 159     if (isChecked()) {
 160         return;
 161     }
 162
 163     const int FadeOutDuration = 150;
 164
 165     if (m_animationId) {
 166         Plasma::Animator::self()->stopElementAnimation(m_animationId);
 167     }
 168
 169     m_fadeIn = false;
 170     m_animationId = Plasma::Animator::self()->customAnimation(
 171         40 / (1000 / FadeOutDuration), FadeOutDuration,
 172         Plasma::Animator::LinearCurve, this, "animationUpdate");
 173 }
 174
 175
 176 void ToolButton::animationUpdate(qreal progress)
 177 {
 178     if (qFuzzyCompare(progress, 1)) {
 179         m_animationId = 0;
 180         m_fadeIn = true;
 181     }
 182
 183     m_alpha = m_fadeIn ? progress : 1 - progress;
 184
 185     // explicit update
 186     update();
 187 }
 188
 189 #include "toolbutton.moc"
 190