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_metaInfos()
  33 {
  34     setFont(KGlobalSettings::smallestReadableFont());
  35     setMinimumHeight(0);
  36 }
  37
  38 MetaTextLabel::~MetaTextLabel()
  39 {
  40 }
  41
  42 void MetaTextLabel::clear()
  43 {
  44     setMinimumHeight(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     m_metaInfos.append(metaInfo);
  55
  56     setMinimumHeight(minimumHeight() + requiredHeight(metaInfo));
  57     update();
  58 }
  59
  60 void MetaTextLabel::paintEvent(QPaintEvent* event)
  61 {
  62     QWidget::paintEvent(event);
  63
  64     QPainter painter(this);
  65
  66     const QColor infoColor = palette().color(QPalette::Foreground);
  67     QColor labelColor = infoColor;
  68     labelColor.setAlpha(128);
  69
  70     int y = 0;
  71     const int infoWidth = width() / 2;
  72     const int labelWidth = infoWidth - 2 * Spacing;
  73     const int infoX = infoWidth;
  74     const int maxHeight = maxHeightPerLine();
  75
  76     foreach (const MetaInfo& metaInfo, m_metaInfos) {
  77         // draw label (e. g. "Date:")
  78         painter.setPen(labelColor);
  79         painter.drawText(0, y, labelWidth, maxHeight,
  80                          Qt::AlignTop | Qt::AlignRight | Qt::TextWordWrap,
  81                          metaInfo.label);
  82
  83         // draw information (e. g. "2008-11-09 20:12")
  84         painter.setPen(infoColor);
  85         painter.drawText(infoX, y, infoWidth, maxHeight,
  86                          Qt::AlignTop | Qt::AlignLeft | Qt::TextWordWrap,
  87                          metaInfo.info);
  88
  89         y += requiredHeight(metaInfo);
  90     }
  91 }
  92
  93 void MetaTextLabel::resizeEvent(QResizeEvent* event)
  94 {
  95     QWidget::resizeEvent(event);
  96
  97     int minimumHeight = 0;
  98     foreach (const MetaInfo& metaInfo, m_metaInfos) {
  99         minimumHeight += requiredHeight(metaInfo);
 100     }
 101     setMinimumHeight(minimumHeight);
 102 }
 103
 104 int MetaTextLabel::requiredHeight(const MetaInfo& metaInfo) const
 105 {
 106     QTextOption textOption;
 107     textOption.setWrapMode(QTextOption::WordWrap);
 108
 109     qreal height = 0;
 110     const int leading = fontMetrics().leading();
 111     const int availableWidth = width() / 2;
 112
 113     QTextLayout textLayout(metaInfo.info);
 114     textLayout.setFont(font());
 115     textLayout.setTextOption(textOption);
 116
 117     textLayout.beginLayout();
 118     QTextLine line = textLayout.createLine();
 119     while (line.isValid()) {
 120         line.setLineWidth(availableWidth);
 121         height += leading;
 122         height += line.height();
 123         line = textLayout.createLine();
 124     }
 125     textLayout.endLayout();
 126
 127     int adjustedHeight = static_cast<int>(height);
 128     if (adjustedHeight > maxHeightPerLine()) {
 129         adjustedHeight = maxHeightPerLine();
 130     }
 131
 132     return adjustedHeight + Spacing;
 133 }
 134
 135 int MetaTextLabel::maxHeightPerLine() const
 136 {
 137     return fontMetrics().height() * 100;
 138 }
 139
 140 #include "metatextlabel.moc"