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
  25 QSize KFormattedBalloonTipDelegate::sizeHint(const KStyleOptionToolTip *option, const KToolTipItem *item) const
  26 {
  27     QTextDocument doc;
  28     doc.setHtml(item->text());
  29     QIcon icon = item->icon();
  30     QSize is = (icon.isNull()) ? QSize(0,0) : QSize(icon.actualSize(option->decorationSize).width(),0);
  31     return doc.size().toSize()+is+QSize(20+5,20+1);
  32 }
  33
  34 void KFormattedBalloonTipDelegate::paint(QPainter *painter, const KStyleOptionToolTip *option, const KToolTipItem *item) const
  35 {
  36     QRect contents;
  37     QPainterPath path = createPath(option, &contents);
  38     bool alpha = haveAlphaChannel();
  39
  40     if (alpha) {
  41         painter->setRenderHint(QPainter::Antialiasing);
  42         painter->translate(.5, .5);
  43     }
  44
  45 #if QT_VERSION >= 0x040400
  46     painter->setBrush(option->palette.brush(QPalette::ToolTipBase));
  47 #else
  48     painter->setBrush(option->palette.brush(QPalette::Base));
  49 #endif
  50     painter->drawPath(path);
  51
  52     QIcon icon = item->icon();
  53     if (!icon.isNull()) {
  54         const QSize iconSize = icon.actualSize(option->decorationSize);
  55         painter->drawPixmap(contents.topLeft(), icon.pixmap(iconSize));
  56         contents.adjust(iconSize.width() + 4, 0, 0, 0);
  57     }
  58
  59     QTextDocument doc;
  60     doc.setHtml(item->text());
  61     QPixmap bitmap(doc.size().toSize());
  62     bitmap.fill(Qt::transparent);
  63     QPainter p(&bitmap);
  64     doc.drawContents(&p);
  65
  66     painter->drawPixmap(contents, bitmap);
  67 }
  68
  69 QRegion KFormattedBalloonTipDelegate::inputShape(const KStyleOptionToolTip *option) const
  70 {
  71     QBitmap bitmap(option->rect.size()+QSize(20,20));
  72     bitmap.fill(Qt::color0);
  73
  74     QPainter p(&bitmap);
  75     p.setPen(QPen(Qt::color1, 1));
  76     p.setBrush(Qt::color1);
  77     p.drawPath(createPath(option, 0));
  78
  79     return QRegion(bitmap);
  80 }
  81
  82 QRegion KFormattedBalloonTipDelegate::shapeMask(const KStyleOptionToolTip *option) const
  83 {
  84     return inputShape(option);
  85 }
  86
  87 static inline void arc(QPainterPath &path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
  88 {
  89     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
  90 }
  91
  92 QPainterPath KFormattedBalloonTipDelegate::createPath(const KStyleOptionToolTip *option, QRect *contents) const
  93 {
  94     QPainterPath path;
  95     QRect rect = option->rect.adjusted(0, 0, -1, -1);
  96     qreal radius = 10;
  97
  98     path.moveTo(rect.left(), rect.top() + radius);
  99     arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
 100     arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
 101     arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
 102     arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
 103     path.closeSubpath();
 104
 105     if (contents)
 106         *contents = rect.adjusted(10, 10, -10, -10);
 107
 108     return path;
 109 }