workspace/plasma/applets/devicenotifier/itemdelegate.cpp

   1 /*
   2     Copyright 2007 Robert Knight <robertknight@gmail.com>
   3     Copyright 2007 Kevin Ottens <ervin@kde.org>
   4     Copyright 2007 Alexis Menard <darktears31@gmail.com>
   5
   6
   7     This library is free software; you can redistribute it and/or
   8     modify it under the terms of the GNU Library General Public
   9     License as published by the Free Software Foundation; either
  10     version 2 of the License, or (at your option) any later version.
  11
  12     This library is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15     Library General Public License for more details.
  16
  17     You should have received a copy of the GNU Library General Public License
  18     along with this library; see the file COPYING.LIB.  If not, write to
  19     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20     Boston, MA 02110-1301, USA.
  21 */
  22
  23 #include "itemdelegate.h"
  24
  25 // Qt
  26 #include <QApplication>
  27 #include <QFontMetrics>
  28 #include <QIcon>
  29 #include <QModelIndex>
  30 #include <QPainter>
  31 #include <QStyleOptionViewItem>
  32
  33 // KDE
  34 #include <KColorUtils>
  35 #include <KDebug>
  36 #include <KGlobal>
  37 #include <KGlobalSettings>
  38
  39 using namespace Notifier;
  40
  41 ItemDelegate::ItemDelegate()
  42 {
  43 }
  44
  45 void ItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
  46 {
  47     const bool hover = option.state & (QStyle::State_Selected|QStyle::State_MouseOver|QStyle::State_HasFocus);
  48     QRect contentRect = option.rect;
  49
  50     QRect decorationRect = QStyle::alignedRect(option.direction,
  51                                                option.decorationPosition == QStyleOptionViewItem::Left ? Qt::AlignLeft : Qt::AlignRight,
  52                                                option.decorationSize,
  53                                                contentRect);
  54     QSize textSize(option.rect.width() - decorationRect.width() - ICON_TEXT_MARGIN,
  55                    option.rect.height() - 2);
  56
  57     Qt::Alignment textAlignment = option.decorationAlignment & Qt::AlignRight ? Qt::AlignLeft : Qt::AlignRight;
  58
  59     QRect textRect = QStyle::alignedRect(option.direction, textAlignment, textSize, contentRect.adjusted(0, 2, 0, 0));
  60     QString titleText = index.data(Qt::DisplayRole).value<QString>();
  61     QString subTitleText = index.data(ActionRole).value<QString>();
  62
  63     if (subTitleText.isEmpty()) {
  64         subTitleText = " ";
  65     }
  66
  67     QFont subTitleFont = fontForSubTitle(option.font);
  68
  69     QFont titleFont(option.font);
  70
  71     QFontMetrics titleMetrics(titleFont);
  72     QFontMetrics subTitleMetrics(subTitleFont);
  73     QRectF textAreaRect = contentRect;
  74     qreal actualTextWidth = qMax(titleMetrics.width(titleText), subTitleMetrics.width(subTitleText));
  75     textAreaRect.adjust(decorationRect.width() + ICON_TEXT_MARGIN - 3,
  76                         0,
  77                         (-(textRect.width() - actualTextWidth) + 3),
  78                         1);
  79
  80     if (hover) {
  81         painter->save();
  82         painter->setPen(Qt::NoPen);
  83         QColor backgroundColor = option.palette.color(QPalette::Highlight);
  84         // use a slightly translucent version of the palette's highlight color
  85         // for the background
  86         backgroundColor.setAlphaF(0.5);
  87         painter->setBrush(QBrush(backgroundColor));
  88         painter->drawPath(roundedRectangle(textAreaRect, 5));
  89         painter->restore();
  90     }
  91
  92     // draw icon
  93     QIcon decorationIcon = index.data(Qt::DecorationRole).value<QIcon>();
  94
  95     if (!hover) {
  96         painter->save();
  97         painter->setOpacity(0.7);
  98     }
  99
 100     decorationIcon.paint(painter, decorationRect, option.decorationAlignment);
 101
 102     if (!hover) {
 103         painter->restore();
 104     }
 105
 106     painter->save();
 107
 108     // draw title
 109     painter->setFont(titleFont);
 110
 111     textAreaRect.setHeight(textAreaRect.height()/2);
 112
 113     painter->drawText(textAreaRect, Qt::AlignLeft|Qt::AlignVCenter, titleText);
 114
 115     // draw sub-title
 116     painter->setFont(subTitleFont);
 117
 118     if (!hover) {
 119         painter->setPen(QPen(Qt::gray));
 120     }
 121     textAreaRect.translate(0, textAreaRect.height());
 122
 123     painter->drawText(textAreaRect, Qt::AlignLeft|Qt::AlignVCenter, subTitleText);
 124
 125     painter->restore();
 126
 127 }
 128
 129 QFont ItemDelegate::fontForSubTitle(const QFont &titleFont) const
 130 {
 131     QFont subTitleFont = titleFont;
 132     subTitleFont.setPointSize(qMax(subTitleFont.pointSize() - 2,
 133                               KGlobalSettings::smallestReadableFont().pointSize()));
 134     return subTitleFont;
 135 }
 136
 137 QSize ItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
 138 {
 139     Q_UNUSED(index)
 140     QFontMetrics metrics(option.font);
 141
 142     QFont subTitleFont = option.font;
 143     subTitleFont.setPointSize(qMax(subTitleFont.pointSize() - 2,
 144                                    KGlobalSettings::smallestReadableFont().pointSize()));
 145     QFontMetrics subMetrics(subTitleFont);
 146
 147     int height = qMax(option.decorationSize.height(), metrics.height() + subMetrics.ascent() + 3);
 148
 149     QString titleText = index.data(Qt::DisplayRole).value<QString>();
 150     QString subTitleText = index.data(ActionRole).value<QString>();
 151
 152     int width = qMax(metrics.width(titleText), subMetrics.width(subTitleText));
 153     width += option.decorationSize.width() + ICON_TEXT_MARGIN;
 154
 155     return QSize(width, height);
 156 }
 157
 158 // Taken from kdelibs/kio/kio/kfileitemdelegate.cpp
 159 QPainterPath ItemDelegate::roundedRectangle(const QRectF &rect, qreal radius) const
 160 {
 161     QPainterPath path(QPointF(rect.left(), rect.top() + radius));
 162     path.quadTo(rect.left(), rect.top(), rect.left() + radius, rect.top());         // Top left corner
 163     path.lineTo(rect.right() - radius, rect.top());                                 // Top side
 164     path.quadTo(rect.right(), rect.top(), rect.right(), rect.top() + radius);       // Top right corner
 165     path.lineTo(rect.right(), rect.bottom() - radius);                              // Right side
 166     path.quadTo(rect.right(), rect.bottom(), rect.right() - radius, rect.bottom()); // Bottom right corner
 167     path.lineTo(rect.left() + radius, rect.bottom());                               // Bottom side
 168     path.quadTo(rect.left(), rect.bottom(), rect.left(), rect.bottom() - radius);   // Bottom left corner
 169     path.closeSubpath();
 170
 171     return path;
 172 }