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
  55     // add the meta information alphabetically sorted
  56     bool inserted = false;
  57     const int count = m_metaInfos.size();
  58     for (int i = 0; i < count; ++i) {
  59         if (m_metaInfos[i].label > labelText) {
  60             m_metaInfos.insert(i, metaInfo);
  61             inserted = true;
  62             break;
  63         }
  64     }
  65     if (!inserted) {
  66         m_metaInfos.append(metaInfo);
  67     }
  68
  69     setMinimumHeight(minimumHeight() + requiredHeight(metaInfo));
  70     update();
  71 }
  72
  73 void MetaTextLabel::paintEvent(QPaintEvent* event)
  74 {
  75     QWidget::paintEvent(event);
  76
  77     QPainter painter(this);
  78
  79     const QColor infoColor = palette().color(QPalette::Foreground);
  80     QColor labelColor = infoColor;
  81     labelColor.setAlpha(128);
  82
  83     int y = 0;
  84     const int infoWidth = infoTextWidth();
  85     const int labelWidth = labelTextWidth();
  86     const int infoX = infoWidth;
  87     const int maxHeight = maxHeightPerLine();
  88
  89     foreach (const MetaInfo& metaInfo, m_metaInfos) {
  90         // draw label (e. g. "Date:")
  91         painter.setPen(labelColor);
  92         painter.drawText(0, y, labelWidth, maxHeight,
  93                          Qt::AlignTop | Qt::AlignRight | Qt::TextWordWrap,
  94                          metaInfo.label);
  95
  96         // draw information (e. g. "2008-11-09 20:12")
  97         painter.setPen(infoColor);
  98         painter.drawText(infoX, y, infoWidth, maxHeight,
  99                          Qt::AlignTop | Qt::AlignLeft | Qt::TextWordWrap,
 100                          metaInfo.info);
 101
 102         y += requiredHeight(metaInfo);
 103     }
 104 }
 105
 106 void MetaTextLabel::resizeEvent(QResizeEvent* event)
 107 {
 108     QWidget::resizeEvent(event);
 109
 110     int minimumHeight = 0;
 111     foreach (const MetaInfo& metaInfo, m_metaInfos) {
 112         minimumHeight += requiredHeight(metaInfo);
 113     }
 114     setMinimumHeight(minimumHeight);
 115 }
 116
 117 int MetaTextLabel::requiredHeight(const MetaInfo& info) const
 118 {
 119     const int labelTextHeight = requiredHeight(info.label, labelTextWidth());
 120     const int infoTextHeight  = requiredHeight(info.info, infoTextWidth());
 121     return qMax(labelTextHeight, infoTextHeight);
 122 }
 123
 124 int MetaTextLabel::requiredHeight(const QString& text, int width) const
 125 {
 126     QTextOption textOption;
 127     textOption.setWrapMode(QTextOption::WordWrap);
 128
 129     qreal height = 0;
 130     const int leading = fontMetrics().leading();
 131
 132     QTextLayout textLayout(text);
 133     textLayout.setFont(font());
 134     textLayout.setTextOption(textOption);
 135
 136     textLayout.beginLayout();
 137     QTextLine line = textLayout.createLine();
 138     while (line.isValid()) {
 139         line.setLineWidth(width);
 140         height += leading;
 141         height += line.height();
 142         line = textLayout.createLine();
 143     }
 144     textLayout.endLayout();
 145
 146     int adjustedHeight = static_cast<int>(height);
 147     if (adjustedHeight > maxHeightPerLine()) {
 148         adjustedHeight = maxHeightPerLine();
 149     }
 150
 151     return adjustedHeight + Spacing;
 152 }
 153
 154 int MetaTextLabel::maxHeightPerLine() const
 155 {
 156     return fontMetrics().height() * 100;
 157 }
 158
 159 #include "metatextlabel.moc"