src/tooltips/kformattedballoontipdelegate.cpp

   1 /*******************************************************************************
   2  *   Copyright (C) 2008 by Fredrik Höglund <fredrik@kde.org>                   *
   3  *   Copyright (C) 2008 by Konstantin Heil <konst.heil@stud.uni-heidelberg.de> *
   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 "kformattedballoontipdelegate.h"
  22 #include <QBitmap>
  23 #include <QLinearGradient>
  24 #include <QTextDocument>
  25 #include <kcolorscheme.h>
  26
  27 KFormattedBalloonTipDelegate::KFormattedBalloonTipDelegate()
  28 {
  29 }
  30
  31 KFormattedBalloonTipDelegate::~KFormattedBalloonTipDelegate()
  32 {
  33 }
  34
  35 QSize KFormattedBalloonTipDelegate::sizeHint(const KStyleOptionToolTip &option, const KToolTipItem &item) const
  36 {
  37     QTextDocument doc;
  38     doc.setHtml(item.text());
  39     const QIcon icon = item.icon();
  40
  41     const QSize iconSize = icon.isNull() ? QSize(0, 0) : icon.actualSize(option.decorationSize);
  42     const QSize docSize = doc.size().toSize();
  43     QSize contentSize = iconSize + docSize;
  44
  45     // assure that the content height is large enough for the icon and the document
  46     contentSize.setHeight(iconSize.height() > doc.size().height() ? iconSize.height() : doc.size().height());
  47     return contentSize + QSize(Border * 3, Border * 2);
  48 }
  49
  50 void KFormattedBalloonTipDelegate::paint(QPainter *painter,
  51                                          const KStyleOptionToolTip &option,
  52                                          const KToolTipItem &item) const
  53 {
  54     QColor toColor = option.palette.brush(QPalette::ToolTipBase).color();
  55     QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
  56
  57     QPainterPath path = createPath(option);
  58     if (haveAlphaChannel()) {
  59         painter->setRenderHint(QPainter::Antialiasing);
  60         painter->translate(.5, .5);
  61         toColor.setAlpha(220);
  62         fromColor.setAlpha(220);
  63     }
  64
  65     QLinearGradient gradient(option.rect.topLeft(), option.rect.bottomLeft());
  66     gradient.setColorAt(0.0, fromColor);
  67     gradient.setColorAt(1.0, toColor);
  68     painter->setPen(Qt::NoPen);
  69     painter->setBrush(gradient);
  70
  71     painter->drawPath(path);
  72
  73     const QIcon icon = item.icon();
  74     int x = Border;
  75     const int y = Border;
  76     if (!icon.isNull()) {
  77         const QSize iconSize = icon.actualSize(option.decorationSize);
  78         const QPoint pos(x + option.rect.x(), y + option.rect.y());
  79         painter->drawPixmap(pos, icon.pixmap(iconSize));
  80         x += iconSize.width() + Border;
  81     }
  82
  83     QTextDocument doc;
  84     doc.setHtml(item.text());
  85     QPixmap bitmap(doc.size().toSize());
  86     bitmap.fill(Qt::transparent);
  87     QPainter p(&bitmap);
  88     doc.drawContents(&p);
  89
  90     const QRect docRect(QPoint(x, y), doc.size().toSize());
  91     painter->drawPixmap(docRect, bitmap);
  92 }
  93
  94 QRegion KFormattedBalloonTipDelegate::inputShape(const KStyleOptionToolTip &option) const
  95 {
  96     QBitmap bitmap(option.rect.size());
  97     bitmap.fill(Qt::color0);
  98
  99     QPainter p(&bitmap);
 100     p.setPen(QPen(Qt::color1, 1));
 101     p.setBrush(Qt::color1);
 102     p.drawPath(createPath(option));
 103
 104     return QRegion(bitmap);
 105 }
 106
 107 QRegion KFormattedBalloonTipDelegate::shapeMask(const KStyleOptionToolTip &option) const
 108 {
 109     return inputShape(option);
 110 }
 111
 112 static inline void arc(QPainterPath &path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
 113 {
 114     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
 115 }
 116
 117 QPainterPath KFormattedBalloonTipDelegate::createPath(const KStyleOptionToolTip& option) const
 118 {
 119     const QRect rect = option.rect;
 120     const qreal radius = 5;
 121
 122     QPainterPath path;
 123     path.moveTo(rect.left(), rect.top() + radius);
 124     arc(path, rect.left()  + radius, rect.top()    + radius, radius, 180, -90);
 125     arc(path, rect.right() - radius, rect.top()    + radius, radius,  90, -90);
 126     arc(path, rect.right() - radius, rect.bottom() - radius, radius,   0, -90);
 127     arc(path, rect.left()  + radius, rect.bottom() - radius, radius, 270, -90);
 128     path.closeSubpath();
 129
 130     return path;
 131 }