src/tooltips/ktooltipdelegate.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Fredrik Höglund <fredrik@kde.org>               *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, 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 General Public License     *
  15  *   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 "ktooltipdelegate.h"
  21
  22 #include "ktooltip.h"
  23
  24 #include <QApplication>
  25 #include <QPainter>
  26 #include <QIcon>
  27
  28 #ifdef Q_WS_X11
  29 #  include <QX11Info>
  30 #  include <X11/Xlib.h>
  31 #  include <X11/extensions/shape.h>
  32 #endif
  33
  34
  35 // ----------------------------------------------------------------------------
  36
  37
  38 KStyleOptionToolTip::KStyleOptionToolTip()
  39     : fontMetrics(QApplication::font())
  40 {
  41 }
  42
  43
  44 // ----------------------------------------------------------------------------
  45
  46
  47 KToolTipDelegate::KToolTipDelegate() : QObject()
  48 {
  49 }
  50
  51 KToolTipDelegate::~KToolTipDelegate()
  52 {
  53 }
  54
  55 QSize KToolTipDelegate::sizeHint(const KStyleOptionToolTip &option, const KToolTipItem &item) const
  56 {
  57     QSize size;
  58     size.rwidth() = option.fontMetrics.width(item.text());
  59     size.rheight() = option.fontMetrics.lineSpacing();
  60
  61     QIcon icon = item.icon();
  62     if (!icon.isNull()) {
  63         const QSize iconSize = icon.actualSize(option.decorationSize);
  64         size.rwidth() += iconSize.width() + 4;
  65         size.rheight() = qMax(size.height(), iconSize.height());
  66     }
  67
  68     return size + QSize(20, 20);
  69
  70 }
  71
  72 void KToolTipDelegate::paint(QPainter *painter,
  73                              const KStyleOptionToolTip &option,
  74                              const KToolTipItem &item) const
  75 {
  76     bool haveAlpha = haveAlphaChannel();
  77     painter->setRenderHint(QPainter::Antialiasing);
  78
  79     QPainterPath path;
  80     if (haveAlpha)
  81         path.addRoundRect(option.rect.adjusted(0, 0, -1, -1), 25);
  82     else
  83         path.addRect(option.rect.adjusted(0, 0, -1, -1));
  84
  85     QColor color = option.palette.color(QPalette::ToolTipBase);
  86     QColor from = color.lighter(105);
  87     QColor to   = color.darker(120);
  88
  89     QLinearGradient gradient(0, 0, 0, 1);
  90     gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
  91     gradient.setColorAt(0, from);
  92     gradient.setColorAt(1, to);
  93
  94     painter->translate(.5, .5);
  95     painter->setPen(QPen(Qt::black, 1));
  96     painter->setBrush(gradient);
  97     painter->drawPath(path);
  98     painter->translate(-.5, -.5);
  99
 100     if (haveAlpha) {
 101         QLinearGradient mask(0, 0, 0, 1);
 102         gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
 103         gradient.setColorAt(0, QColor(0, 0, 0, 192));
 104         gradient.setColorAt(1, QColor(0, 0, 0, 72));
 105         painter->setCompositionMode(QPainter::CompositionMode_DestinationIn);
 106         painter->fillRect(option.rect, gradient);
 107         painter->setCompositionMode(QPainter::CompositionMode_SourceOver);
 108     }
 109
 110     QRect textRect = option.rect.adjusted(10, 10, -10, -10);
 111
 112     QIcon icon = item.icon();
 113     if (!icon.isNull()) {
 114         const QSize iconSize = icon.actualSize(option.decorationSize);
 115         painter->drawPixmap(textRect.topLeft(), icon.pixmap(iconSize));
 116         textRect.adjust(iconSize.width() + 4, 0, 0, 0);
 117     }
 118     painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, item.text());
 119 }
 120
 121 QRegion KToolTipDelegate::inputShape(const KStyleOptionToolTip &option) const
 122 {
 123     return QRegion(option.rect);
 124 }
 125
 126 QRegion KToolTipDelegate::shapeMask(const KStyleOptionToolTip &option) const
 127 {
 128     return QRegion(option.rect);
 129 }
 130
 131 bool KToolTipDelegate::haveAlphaChannel() const
 132 {
 133 #ifdef Q_WS_X11
 134     return QX11Info::isCompositingManagerRunning();
 135 #else
 136         return false;
 137 #endif
 138 }