src/panels/information/metatextlabel.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at>                  *
   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 "metatextlabel.h"
  21
  22 #include <kglobalsettings.h>
  23 #include <klocale.h>
  24
  25 #include <QPainter>
  26 #include <QTextLayout>
  27 #include <QTextLine>
  28 #include <kdebug.h>
  29
  30 MetaTextLabel::MetaTextLabel(QWidget* parent) :
  31     QWidget(parent),
  32     m_minimumHeight(0),
  33     m_metaInfos()
  34 {
  35     setFont(KGlobalSettings::smallestReadableFont());
  36 }
  37
  38 MetaTextLabel::~MetaTextLabel()
  39 {
  40 }
  41
  42 void MetaTextLabel::clear()
  43 {
  44     m_minimumHeight = 0;
  45     m_metaInfos.clear();
  46     update();
  47 }
  48
  49 void MetaTextLabel::add(const QString& labelText, const QString& infoText)
  50 {
  51     MetaInfo metaInfo;
  52     metaInfo.label = labelText;
  53     metaInfo.info = infoText;
  54
  55     m_metaInfos.append(metaInfo);
  56
  57     m_minimumHeight += requiredHeight(metaInfo);
  58     setMinimumHeight(m_minimumHeight);
  59
  60     update();
  61 }
  62
  63 void MetaTextLabel::paintEvent(QPaintEvent* event)
  64 {
  65     QWidget::paintEvent(event);
  66
  67     QPainter painter(this);
  68
  69     const QColor infoColor = palette().color(QPalette::Foreground);
  70     QColor labelColor = infoColor;
  71     labelColor.setAlpha(128);
  72
  73     int y = 0;
  74     const int infoWidth = width() / 2;
  75     const int labelWidth = infoWidth - 2 * Spacing;
  76     const int infoX = infoWidth;
  77     const int maxHeight = fontMetrics().height() * 5;
  78
  79     QRect boundingRect;
  80     foreach (const MetaInfo& metaInfo, m_metaInfos) {
  81         // draw label (e. g. "Date:")
  82         painter.setPen(labelColor);
  83         painter.drawText(0, y, labelWidth, maxHeight,
  84                          Qt::AlignTop | Qt::AlignRight | Qt::TextWordWrap,
  85                          metaInfo.label);
  86
  87         // draw information (e. g. "2008-11-09 20:12")
  88         painter.setPen(infoColor);
  89         painter.drawText(infoX, y, infoWidth, maxHeight,
  90                          Qt::AlignTop | Qt::AlignLeft | Qt::TextWordWrap,
  91                          metaInfo.info,
  92                          &boundingRect);
  93
  94         y += boundingRect.height() + Spacing;
  95     }
  96 }
  97
  98 void MetaTextLabel::resizeEvent(QResizeEvent* event)
  99 {
 100     QWidget::resizeEvent(event);
 101
 102     m_minimumHeight = 0;
 103     foreach (const MetaInfo& metaInfo, m_metaInfos) {
 104         m_minimumHeight += requiredHeight(metaInfo);
 105     }
 106     setMinimumHeight(m_minimumHeight);
 107 }
 108
 109 int MetaTextLabel::requiredHeight(const MetaInfo& metaInfo) const
 110 {
 111     QTextOption textOption;
 112     textOption.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
 113
 114     qreal height = 0;
 115     const int leading = fontMetrics().leading();
 116     const int availableWidth = width() / 2;
 117
 118     QTextLayout textLayout(metaInfo.info);
 119     textLayout.setFont(font());
 120     textLayout.setTextOption(textOption);
 121
 122     textLayout.beginLayout();
 123     QTextLine line = textLayout.createLine();
 124     while (line.isValid()) {
 125         line.setLineWidth(availableWidth);
 126         height += leading;
 127         height += line.height();
 128         line = textLayout.createLine();
 129     }
 130     textLayout.endLayout();
 131
 132     return static_cast<int>(height) + Spacing;
 133 }
 134
 135 #include "metatextlabel.moc"