src/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 <QTextDocument>
  24 #include <kdebug.h>
  25
  26 QSize KFormattedBalloonTipDelegate::sizeHint(const KStyleOptionToolTip *option, const KToolTipItem *item) const
  27 {
  28     QTextDocument doc;
  29     doc.setHtml(item->text());
  30     QIcon icon = item->icon();
  31
  32     QSize iconSize = (icon.isNull()) ? QSize(0,0) : icon.actualSize(option->decorationSize);
  33     QSize docSize = doc.size().toSize();
  34     QSize contentSize = iconSize + docSize;
  35
  36     // Re-adjust contentSize's height so that it is the maximum of the icon
  37     // and doc sizes.
  38     contentSize.setHeight( iconSize.height() > doc.size().height() ? iconSize.height() : doc.size().height());
  39     return contentSize + QSize(20+5,20+1);
  40 }
  41
  42 void KFormattedBalloonTipDelegate::paint(QPainter *painter, const KStyleOptionToolTip *option, const KToolTipItem *item) const
  43 {
  44     QRect contents;
  45     QPainterPath path = createPath(option, &contents);
  46     bool alpha = haveAlphaChannel();
  47
  48     if (alpha) {
  49         painter->setRenderHint(QPainter::Antialiasing);
  50         painter->translate(.5, .5);
  51     }
  52
  53 #if QT_VERSION >= 0x040400
  54     painter->setBrush(option->palette.brush(QPalette::ToolTipBase));
  55 #else
  56     painter->setBrush(option->palette.brush(QPalette::Base));
  57 #endif
  58     painter->drawPath(path);
  59
  60     QIcon icon = item->icon();
  61     if (!icon.isNull()) {
  62         const QSize iconSize = icon.actualSize(option->decorationSize);
  63         painter->drawPixmap(contents.topLeft(), icon.pixmap(iconSize));
  64         contents.adjust(iconSize.width() + 4, 0, 0, 0);
  65     }
  66
  67     QTextDocument doc;
  68     doc.setHtml(item->text());
  69     QPixmap bitmap(doc.size().toSize());
  70     bitmap.fill(Qt::transparent);
  71     QPainter p(&bitmap);
  72     doc.drawContents(&p);
  73
  74     // Ensure doc text is not stretched when icon is larger.
  75     contents.setSize(doc.size().toSize());
  76
  77     painter->drawPixmap(contents, bitmap);
  78 }
  79
  80 QRegion KFormattedBalloonTipDelegate::inputShape(const KStyleOptionToolTip *option) const
  81 {
  82     QBitmap bitmap(option->rect.size()+QSize(20,20));
  83     bitmap.fill(Qt::color0);
  84
  85     QPainter p(&bitmap);
  86     p.setPen(QPen(Qt::color1, 1));
  87     p.setBrush(Qt::color1);
  88     p.drawPath(createPath(option, 0));
  89
  90     return QRegion(bitmap);
  91 }
  92
  93 QRegion KFormattedBalloonTipDelegate::shapeMask(const KStyleOptionToolTip *option) const
  94 {
  95     return inputShape(option);
  96 }
  97
  98 static inline void arc(QPainterPath &path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
  99 {
 100     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
 101 }
 102
 103 QPainterPath KFormattedBalloonTipDelegate::createPath(const KStyleOptionToolTip *option, QRect *contents) const
 104 {
 105     QPainterPath path;
 106     QRect rect = option->rect.adjusted(0, 0, -1, -1);
 107     const qreal radius = 5;
 108
 109     path.moveTo(rect.left(), rect.top() + radius);
 110     arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
 111     arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
 112     arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
 113     arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
 114     path.closeSubpath();
 115
 116     if (contents)
 117         *contents = rect.adjusted(radius, radius, -radius, -radius);
 118
 119     return path;
 120 }