src/views/tooltips/filemetadatatooltip.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Peter Penz <peter.penz@gmx.at>                  *
   3  *   Copyright (C) 2008 by Fredrik Höglund <fredrik@kde.org>               *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, 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 General Public License     *
  16  *   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 "filemetadatatooltip.h"
  22
  23 #include <kcolorscheme.h>
  24 #include <kfilemetadatawidget.h>
  25 #include <kseparator.h>
  26 #include <kwindowsystem.h>
  27
  28 #include <QLabel>
  29 #include <QPainter>
  30 #include <QVBoxLayout>
  31
  32 FileMetaDataToolTip::FileMetaDataToolTip(QWidget* parent) :
  33     QWidget(parent),
  34     m_preview(0),
  35     m_name(0),
  36     m_fileMetaDataWidget(0)
  37
  38 {
  39     setAttribute(Qt::WA_TranslucentBackground);
  40     setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);
  41
  42     // Create widget for file preview
  43     m_preview = new QLabel(this);
  44
  45     // Create widget for file name
  46     m_name = new QLabel(this);
  47     QFont font = m_name->font();
  48     font.setBold(true);
  49     m_name->setFont(font);
  50     m_name->setAlignment(Qt::AlignHCenter);
  51
  52     // Create widget for the meta data
  53     m_fileMetaDataWidget = new KFileMetaDataWidget();
  54     m_fileMetaDataWidget->setForegroundRole(QPalette::ToolTipText);
  55     m_fileMetaDataWidget->setReadOnly(true);
  56
  57     // The stretchwidget allows the metadata widget to be top aligned and fills
  58     // the remaining vertical space
  59     QWidget* stretchWidget = new QWidget(this);
  60     stretchWidget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
  61
  62     QWidget* textContainer = new QWidget(this);
  63     QVBoxLayout* textLayout = new QVBoxLayout(textContainer);
  64     textLayout->addWidget(m_name);
  65     textLayout->addWidget(new KSeparator());
  66     textLayout->addWidget(m_fileMetaDataWidget);
  67     textLayout->addWidget(stretchWidget);
  68
  69     QHBoxLayout* tipLayout = new QHBoxLayout(this);
  70     tipLayout->addWidget(m_preview);
  71     tipLayout->addWidget(textContainer);
  72
  73     tipLayout->setSizeConstraint(QLayout::SetFixedSize);
  74 }
  75
  76 FileMetaDataToolTip::~FileMetaDataToolTip()
  77 {
  78 }
  79
  80 void FileMetaDataToolTip::setPreview(const QPixmap& pixmap)
  81 {
  82     m_preview->setPixmap(pixmap);
  83 }
  84
  85 const QPixmap* FileMetaDataToolTip::preview() const
  86 {
  87     return m_preview->pixmap();
  88 }
  89
  90 void FileMetaDataToolTip::setName(const QString& name)
  91 {
  92     m_name->setText(name);
  93 }
  94
  95 QString FileMetaDataToolTip::name() const
  96 {
  97     return m_name->text();
  98 }
  99
 100 void FileMetaDataToolTip::setItems(const KFileItemList& items)
 101 {
 102     m_fileMetaDataWidget->setItems(items);
 103 }
 104
 105 KFileItemList FileMetaDataToolTip::items() const
 106 {
 107     return m_fileMetaDataWidget->items();
 108 }
 109
 110 void FileMetaDataToolTip::paintEvent(QPaintEvent* event)
 111 {
 112     Q_UNUSED(event);
 113
 114     QPainter painter(this);
 115
 116     QColor toColor = palette().brush(QPalette::ToolTipBase).color();
 117     QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
 118
 119     const bool haveAlphaChannel = KWindowSystem::compositingActive();
 120     if (haveAlphaChannel) {
 121         painter.setRenderHint(QPainter::Antialiasing);
 122         painter.translate(0.5, 0.5);
 123         toColor.setAlpha(220);
 124         fromColor.setAlpha(220);
 125     }
 126
 127     QLinearGradient gradient(QPointF(0.0, 0.0), QPointF(0.0, height()));
 128     gradient.setColorAt(0.0, fromColor);
 129     gradient.setColorAt(1.0, toColor);
 130     painter.setPen(Qt::NoPen);
 131     painter.setBrush(gradient);
 132
 133     const QRect rect(0, 0, width(), height());
 134     if (haveAlphaChannel) {
 135         const qreal radius = 5.0;
 136
 137         QPainterPath path;
 138         path.moveTo(rect.left(), rect.top() + radius);
 139         arc(path, rect.left()  + radius, rect.top()    + radius, radius, 180, -90);
 140         arc(path, rect.right() - radius, rect.top()    + radius, radius,  90, -90);
 141         arc(path, rect.right() - radius, rect.bottom() - radius, radius,   0, -90);
 142         arc(path, rect.left()  + radius, rect.bottom() - radius, radius, 270, -90);
 143         path.closeSubpath();
 144
 145         painter.drawPath(path);
 146     } else {
 147         painter.drawRect(rect);
 148     }
 149 }
 150
 151 void FileMetaDataToolTip::arc(QPainterPath& path,
 152                               qreal cx, qreal cy,
 153                               qreal radius, qreal angle,
 154                               qreal sweepLength)
 155 {
 156     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweepLength);
 157 }
 158
 159 #include "filemetadatatooltip.moc"