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 <QLinearGradient>
  24 #include <QTextDocument>
  25 #include <kcolorscheme.h>
  26 #include <kdebug.h>
  27
  28 QSize KFormattedBalloonTipDelegate::sizeHint(const KStyleOptionToolTip *option, const KToolTipItem *item) const
  29 {
  30     QTextDocument doc;
  31     doc.setHtml(item->text());
  32     QIcon icon = item->icon();
  33
  34     QSize iconSize = (icon.isNull()) ? QSize(0,0) : icon.actualSize(option->decorationSize);
  35     QSize docSize = doc.size().toSize();
  36     QSize contentSize = iconSize + docSize;
  37
  38     // Re-adjust contentSize's height so that it is the maximum of the icon
  39     // and doc sizes.
  40     contentSize.setHeight( iconSize.height() > doc.size().height() ? iconSize.height() : doc.size().height());
  41     return contentSize + QSize(20+5,20+1);
  42 }
  43
  44 void KFormattedBalloonTipDelegate::paint(QPainter *painter, const KStyleOptionToolTip *option, const KToolTipItem *item) const
  45 {
  46     QRect contents;
  47     QPainterPath path = createPath(option, &contents);
  48     if (haveAlphaChannel()) {
  49         painter->setRenderHint(QPainter::Antialiasing);
  50         painter->translate(.5, .5);
  51     }
  52
  53 #if QT_VERSION >= 0x040400
  54     const QColor toColor = option->palette.brush(QPalette::ToolTipBase).color();
  55 #else
  56     const QColor toColor = option->palette.brush(QPalette::Base).color();
  57 #endif
  58     const QColor fromColor = KColorScheme::shade(toColor, KColorScheme::LightShade, 0.2);
  59
  60     QLinearGradient gradient(option->rect.topLeft(), option->rect.bottomLeft());
  61     gradient.setColorAt(0.0, fromColor);
  62     gradient.setColorAt(1.0, toColor);
  63     painter->setPen(Qt::NoPen);
  64     painter->setBrush(gradient);
  65
  66     painter->drawPath(path);
  67
  68     QIcon icon = item->icon();
  69     if (!icon.isNull()) {
  70         const QSize iconSize = icon.actualSize(option->decorationSize);
  71         painter->drawPixmap(contents.topLeft(), icon.pixmap(iconSize));
  72         contents.adjust(iconSize.width() + 4, 0, 0, 0);
  73     }
  74
  75     QTextDocument doc;
  76     doc.setHtml(item->text());
  77     QPixmap bitmap(doc.size().toSize());
  78     bitmap.fill(Qt::transparent);
  79     QPainter p(&bitmap);
  80     doc.drawContents(&p);
  81
  82     // Ensure doc text is not stretched when icon is larger.
  83     contents.setSize(doc.size().toSize());
  84
  85     painter->drawPixmap(contents, bitmap);
  86 }
  87
  88 QRegion KFormattedBalloonTipDelegate::inputShape(const KStyleOptionToolTip *option) const
  89 {
  90     QBitmap bitmap(option->rect.size()+QSize(20,20));
  91     bitmap.fill(Qt::color0);
  92
  93     QPainter p(&bitmap);
  94     p.setPen(QPen(Qt::color1, 1));
  95     p.setBrush(Qt::color1);
  96     p.drawPath(createPath(option, 0));
  97
  98     return QRegion(bitmap);
  99 }
 100
 101 QRegion KFormattedBalloonTipDelegate::shapeMask(const KStyleOptionToolTip *option) const
 102 {
 103     return inputShape(option);
 104 }
 105
 106 static inline void arc(QPainterPath &path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
 107 {
 108     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
 109 }
 110
 111 QPainterPath KFormattedBalloonTipDelegate::createPath(const KStyleOptionToolTip *option, QRect *contents) const
 112 {
 113     QPainterPath path;
 114     QRect rect = option->rect.adjusted(0, 0, -1, -1);
 115     const qreal radius = 5;
 116
 117     path.moveTo(rect.left(), rect.top() + radius);
 118     arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
 119     arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
 120     arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
 121     arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
 122     path.closeSubpath();
 123
 124     if (contents)
 125         *contents = rect.adjusted(radius, radius, -radius, -radius);
 126
 127     return path;
 128 }