src/kballoontipdelegate.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Fredrik Höglund <fredrik@kde.org>               *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "kballoontipdelegate.h"
  21 #include <QPainterPath>
  22 #include <QPainter>
  23 #include <QBitmap>
  24
  25 QSize KBalloonTipDelegate::sizeHint(const KStyleOptionToolTip *option, const KToolTipItem *item) const
  26 {
  27     QSize size;
  28     size.rwidth() = option->fontMetrics.width(item->text());
  29     size.rheight() = option->fontMetrics.lineSpacing();
  30
  31     QIcon icon = item->icon();
  32     if (!icon.isNull()) {
  33         const QSize iconSize = icon.actualSize(option->decorationSize);
  34         size.rwidth() += iconSize.width() + 4;
  35         size.rheight() = qMax(size.height(), iconSize.height());
  36     }
  37
  38     int margin = 2 * 10 + (option->activeCorner != KStyleOptionToolTip::NoCorner ? 10 : 0);
  39     return size + QSize(margin, margin);
  40 }
  41
  42 static inline void arc(QPainterPath &path, qreal cx, qreal cy, qreal radius, qreal angle, qreal sweeplength)
  43 {
  44     path.arcTo(cx-radius, cy-radius, radius * 2, radius * 2, angle, sweeplength);
  45 }
  46
  47 QPainterPath KBalloonTipDelegate::createPath(const KStyleOptionToolTip *option, QRect *contents) const
  48 {
  49     QPainterPath path;
  50     QRect rect = option->rect.adjusted(0, 0, -1, -1);
  51     qreal radius = 10;
  52
  53     switch (option->activeCorner)
  54     {
  55     case KStyleOptionToolTip::TopLeftCorner:
  56         rect.adjust(10, 10, 0, 0);
  57         path.moveTo(option->rect.topLeft());
  58         path.lineTo(rect.left() + radius, rect.top());
  59         arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
  60         arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
  61         arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
  62         path.lineTo(rect.left(), rect.top() + radius);
  63         path.closeSubpath();
  64         break;
  65
  66     case KStyleOptionToolTip::TopRightCorner:
  67         rect.adjust(0, 10, -10, 0);
  68         path.moveTo(option->rect.topRight());
  69         path.lineTo(rect.right(), rect.top() + radius);
  70         arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
  71         arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
  72         arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
  73         path.lineTo(rect.right() - radius, rect.top());
  74         path.closeSubpath();
  75         break;
  76
  77     case KStyleOptionToolTip::BottomLeftCorner:
  78         rect.adjust(10, 0, 0, -10);
  79         path.moveTo(option->rect.bottomLeft());
  80         path.lineTo(rect.left(), rect.bottom() - radius);
  81         arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
  82         arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
  83         arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
  84         path.lineTo(rect.left() + radius, rect.bottom());
  85         path.closeSubpath();
  86         break;
  87
  88     case KStyleOptionToolTip::BottomRightCorner:
  89         rect.adjust(0, 0, -10, -10);
  90         path.moveTo(option->rect.bottomRight());
  91         path.lineTo(rect.right() - radius, rect.bottom());
  92         arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
  93         arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
  94         arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
  95         path.lineTo(rect.right(), rect.bottom() - radius);
  96         path.closeSubpath();
  97         break;
  98
  99     default:
 100         path.moveTo(rect.left(), rect.top() + radius);
 101         arc(path, rect.left() + radius, rect.top() + radius, radius, 180, -90);
 102         arc(path, rect.right() - radius, rect.top() + radius, radius, 90, -90);
 103         arc(path, rect.right() - radius, rect.bottom() - radius, radius, 0, -90);
 104         arc(path, rect.left() + radius, rect.bottom() - radius, radius, 270, -90);
 105         path.closeSubpath();
 106         break;
 107     }
 108
 109     if (contents)
 110         *contents = rect.adjusted(10, 10, -10, -10);
 111
 112     return path;
 113 }
 114
 115 void KBalloonTipDelegate::paint(QPainter *painter, const KStyleOptionToolTip *option, const KToolTipItem *item) const
 116 {
 117     QRect contents;
 118     QPainterPath path = createPath(option, &contents);
 119     bool alpha = haveAlphaChannel();
 120
 121     if (alpha) {
 122         painter->setRenderHint(QPainter::Antialiasing);
 123         painter->translate(.5, .5);
 124     }
 125
 126 #if QT_VERSION >= 0x040400
 127     painter->setBrush(option->palette.brush(QPalette::ToolTipBase));
 128 #else
 129     painter->setBrush(option->palette.brush(QPalette::Base));
 130 #endif
 131     painter->drawPath(path);
 132
 133     if (alpha)
 134         painter->translate(-.5, -.5);
 135
 136     QIcon icon = item->icon();
 137     if (!icon.isNull()) {
 138         const QSize iconSize = icon.actualSize(option->decorationSize);
 139         painter->drawPixmap(contents.topLeft(), icon.pixmap(iconSize));
 140         contents.adjust(iconSize.width() + 4, 0, 0, 0);
 141     }
 142
 143     painter->drawText(contents, Qt::AlignLeft | Qt::AlignVCenter, item->text());
 144 }
 145
 146
 147 QRegion KBalloonTipDelegate::inputShape(const KStyleOptionToolTip *option) const
 148 {
 149     QBitmap bitmap(option->rect.size());
 150     bitmap.fill(Qt::color0);
 151
 152     QPainter p(&bitmap);
 153     p.setPen(QPen(Qt::color1, 1));
 154     p.setBrush(Qt::color1);
 155     p.drawPath(createPath(option));
 156
 157     return QRegion(bitmap);
 158 }
 159
 160 QRegion KBalloonTipDelegate::shapeMask(const KStyleOptionToolTip *option) const
 161 {
 162     return inputShape(option);
 163 }
 164