src/views/tooltips/filemetadatatooltip.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2010 by Peter Penz <peter.penz19@gmail.com>             *
   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>
  24 #include <KFileMetaDataWidget>
  25 #include <KSeparator>
  26 #include <KWindowSystem>
  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     setAttribute(Qt::WA_TranslucentBackground);
  39     setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint);
  40
  41     // Create widget for file preview
  42     m_preview = new QLabel(this);
  43     m_preview->setAlignment(Qt::AlignTop);
  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
  51     // Create widget for the meta data
  52     m_fileMetaDataWidget = new KFileMetaDataWidget();
  53     m_fileMetaDataWidget->setForegroundRole(QPalette::ToolTipText);
  54     m_fileMetaDataWidget->setReadOnly(true);
  55     connect(m_fileMetaDataWidget, SIGNAL(metaDataRequestFinished(KFileItemList)),
  56             this, SIGNAL(metaDataRequestFinished(KFileItemList)));
  57
  58     QVBoxLayout* textLayout = new QVBoxLayout();
  59     textLayout->addWidget(m_name);
  60     textLayout->addWidget(new KSeparator());
  61     textLayout->addWidget(m_fileMetaDataWidget);
  62     textLayout->setAlignment(m_name, Qt::AlignCenter);
  63     textLayout->setAlignment(m_fileMetaDataWidget, Qt::AlignLeft);
  64     // Assure that the text-layout gets top-aligned by adding a stretch.
  65     // Don't use textLayout->setAlignment(Qt::AlignTop) instead, as this does
  66     // not work with the heightForWidth()-size-hint of m_fileMetaDataWidget
  67     // (see bug #241608)
  68     textLayout->addStretch();
  69
  70     QHBoxLayout* tipLayout = new QHBoxLayout(this);
  71     tipLayout->addWidget(m_preview);
  72     tipLayout->addSpacing(tipLayout->margin());
  73     tipLayout->addLayout(textLayout);
  74 }
  75
  76 FileMetaDataToolTip::~FileMetaDataToolTip()
  77 {
  78 }
  79
  80 void FileMetaDataToolTip::setPreview(const QPixmap& pixmap)
  81 {
  82     m_preview->setPixmap(pixmap);
  83 }
  84
  85 QPixmap FileMetaDataToolTip::preview() const
  86 {
  87     if (m_preview->pixmap() != 0) {
  88         return *m_preview->pixmap();
  89     }
  90     return QPixmap();
  91 }
  92
  93 void FileMetaDataToolTip::setName(const QString& name)
  94 {
  95     m_name->setText(name);
  96 }
  97
  98 QString FileMetaDataToolTip::name() const
  99 {
 100     return m_name->text();
 101 }
 102
 103 void FileMetaDataToolTip::setItems(const KFileItemList& items)
 104 {
 105     m_fileMetaDataWidget->setItems(items);
 106 }
 107
 108 KFileItemList FileMetaDataToolTip::items() const
 109 {
 110     return m_fileMetaDataWidget->items();
 111 }
 112
 113 void FileMetaDataToolTip::paintEvent(QPaintEvent* event)
 114 {
 115     Q_UNUSED(event);
 116
 117     QPainter painter(this);
 118
 119     QColor toColor = palette().brush(QPalette::ToolTipBase).color();
 120     QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
 121
 122     const bool haveAlphaChannel = KWindowSystem::compositingActive();
 123     if (haveAlphaChannel) {
 124         painter.setRenderHint(QPainter::Antialiasing);
 125         painter.translate(0.5, 0.5);
 126         toColor.setAlpha(220);
 127         fromColor.setAlpha(220);
 128     }
 129
 130     QLinearGradient gradient(QPointF(0.0, 0.0), QPointF(0.0, height()));
 131     gradient.setColorAt(0.0, fromColor);
 132     gradient.setColorAt(1.0, toColor);
 133     painter.setPen(Qt::NoPen);
 134     painter.setBrush(gradient);
 135
 136     const QRect rect(0, 0, width(), height());
 137     if (haveAlphaChannel) {
 138         const qreal radius = 5.0;
 139
 140         QPainterPath path;
 141         path.moveTo(rect.left(), rect.top() + radius);
 142         arc(path, rect.left()  + radius, rect.top()    + radius, radius, 180, -90);
 143         arc(path, rect.right() - radius, rect.top()    + radius, radius,  90, -90);
 144         arc(path, rect.right() - radius, rect.bottom() - radius, radius,   0, -90);
 145         arc(path, rect.left()  + radius, rect.bottom() - radius, radius, 270, -90);
 146         path.closeSubpath();
 147
 148         painter.drawPath(path);
 149     } else {
 150         painter.drawRect(rect);
 151     }
 152 }
 153
 154 void FileMetaDataToolTip::arc(QPainterPath& path,
 155                               qreal cx, qreal cy,
 156                               qreal radius, qreal angle,
 157                               qreal sweepLength)
 158 {
 159     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweepLength);
 160 }
 161
 162 #include "filemetadatatooltip.moc"