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 "ktooltipitem.h"
  23 #include "ktooltip.h"
  24 #include <QBitmap>
  25 #include <QIcon>
  26 #include <QLinearGradient>
  27 #include <QTextDocument>
  28 #include <kcolorscheme.h>
  29
  30 KFormattedBalloonTipDelegate::KFormattedBalloonTipDelegate()
  31 {
  32 }
  33
  34 KFormattedBalloonTipDelegate::~KFormattedBalloonTipDelegate()
  35 {
  36 }
  37
  38 QSize KFormattedBalloonTipDelegate::sizeHint(const KStyleOptionToolTip &option, const KToolTipItem &item) const
  39 {
  40     QTextDocument doc;
  41     doc.setHtml(item.text());
  42     const QIcon icon = item.icon();
  43
  44     const QSize iconSize = icon.isNull() ? QSize(0, 0) : icon.actualSize(option.decorationSize);
  45     const QSize docSize = doc.size().toSize();
  46     QSize contentSize = iconSize + docSize;
  47
  48     // assure that the content height is large enough for the icon and the document
  49     contentSize.setHeight(iconSize.height() > doc.size().height() ? iconSize.height() : doc.size().height());
  50     return contentSize + QSize(Border * 3, Border * 2);
  51 }
  52
  53 void KFormattedBalloonTipDelegate::paint(QPainter *painter,
  54                                          const KStyleOptionToolTip &option,
  55                                          const KToolTipItem &item) const
  56 {
  57     QColor toColor = option.palette.brush(QPalette::ToolTipBase).color();
  58     QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
  59
  60     QPainterPath path = createPath(option);
  61     if (haveAlphaChannel()) {
  62         painter->setRenderHint(QPainter::Antialiasing);
  63         painter->translate(.5, .5);
  64         toColor.setAlpha(220);
  65         fromColor.setAlpha(220);
  66     }
  67
  68     QLinearGradient gradient(option.rect.topLeft(), option.rect.bottomLeft());
  69     gradient.setColorAt(0.0, fromColor);
  70     gradient.setColorAt(1.0, toColor);
  71     painter->setPen(Qt::NoPen);
  72     painter->setBrush(gradient);
  73
  74     painter->drawPath(path);
  75
  76     const QIcon icon = item.icon();
  77     int x = Border;
  78     const int y = Border;
  79     if (!icon.isNull()) {
  80         const QSize iconSize = icon.actualSize(option.decorationSize);
  81         const QPoint pos(x + option.rect.x(), y + option.rect.y());
  82         painter->drawPixmap(pos, icon.pixmap(iconSize));
  83         x += iconSize.width() + Border;
  84     }
  85
  86     QTextDocument doc;
  87     doc.setHtml(item.text());
  88     QPixmap bitmap(doc.size().toSize());
  89     bitmap.fill(Qt::transparent);
  90     QPainter p(&bitmap);
  91     doc.drawContents(&p);
  92
  93     const QRect docRect(QPoint(x, y), doc.size().toSize());
  94     painter->drawPixmap(docRect, bitmap);
  95 }
  96
  97 QRegion KFormattedBalloonTipDelegate::inputShape(const KStyleOptionToolTip &option) const
  98 {
  99     QBitmap bitmap(option.rect.size());
 100     bitmap.fill(Qt::color0);
 101
 102     QPainter p(&bitmap);
 103     p.setPen(QPen(Qt::color1, 1));
 104     p.setBrush(Qt::color1);
 105     p.drawPath(createPath(option));
 106
 107     return QRegion(bitmap);
 108 }
 109
 110 QRegion KFormattedBalloonTipDelegate::shapeMask(const KStyleOptionToolTip &option) const
 111 {
 112     return inputShape(option);
 113 }
 114
 115 static inline void arc(QPainterPath &path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
 116 {
 117     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
 118 }
 119
 120 QPainterPath KFormattedBalloonTipDelegate::createPath(const KStyleOptionToolTip& option) const
 121 {
 122     const QRect rect = option.rect;
 123     const qreal radius = 5;
 124
 125     QPainterPath path;
 126     path.moveTo(rect.left(), rect.top() + radius);
 127     arc(path, rect.left()  + radius, rect.top()    + radius, radius, 180, -90);
 128     arc(path, rect.right() - radius, rect.top()    + radius, radius,  90, -90);
 129     arc(path, rect.right() - radius, rect.bottom() - radius, radius,   0, -90);
 130     arc(path, rect.left()  + radius, rect.bottom() - radius, radius, 270, -90);
 131     path.closeSubpath();
 132
 133     return path;
 134 }