src/kitemviews/kitemlistheader.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   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 "kitemlistheader_p.h"
  21
  22 #include "kitemmodelbase.h"
  23
  24 #include <QFontMetricsF>
  25 #include <QPainter>
  26 #include <QStyleOptionHeader>
  27
  28 KItemListHeader::KItemListHeader(QGraphicsWidget* parent) :
  29     QGraphicsWidget(parent),
  30     m_model(0),
  31     m_visibleRoles(),
  32     m_visibleRolesWidths()
  33 {
  34     QStyleOptionHeader opt;
  35     const QSize headerSize = style()->sizeFromContents(QStyle::CT_HeaderSection, &opt, QSize());
  36     resize(0, headerSize.height());
  37 }
  38
  39 KItemListHeader::~KItemListHeader()
  40 {
  41 }
  42
  43 void KItemListHeader::setModel(KItemModelBase* model)
  44 {
  45     if (m_model == model) {
  46         return;
  47     }
  48
  49     if (m_model) {
  50         disconnect(m_model, SIGNAL(sortRoleChanged(QByteArray,QByteArray)),
  51                    this, SLOT(slotSortRoleChanged(QByteArray,QByteArray)));
  52         disconnect(m_model, SIGNAL(sortOrderChanged(Qt::SortOrder,Qt::SortOrder)),
  53                    this, SLOT(slotSortOrderChanged(Qt::SortOrder,Qt::SortOrder)));
  54     }
  55
  56     m_model = model;
  57
  58     if (m_model) {
  59         connect(m_model, SIGNAL(sortRoleChanged(QByteArray,QByteArray)),
  60                 this, SLOT(slotSortRoleChanged(QByteArray,QByteArray)));
  61         connect(m_model, SIGNAL(sortOrderChanged(Qt::SortOrder,Qt::SortOrder)),
  62                 this, SLOT(slotSortOrderChanged(Qt::SortOrder,Qt::SortOrder)));
  63     }
  64 }
  65
  66 KItemModelBase* KItemListHeader::model() const
  67 {
  68     return m_model;
  69 }
  70
  71 void KItemListHeader::setVisibleRoles(const QList<QByteArray>& roles)
  72 {
  73     m_visibleRoles = roles;
  74     update();
  75 }
  76
  77 QList<QByteArray> KItemListHeader::visibleRoles() const
  78 {
  79     return m_visibleRoles;
  80 }
  81
  82 void KItemListHeader::setVisibleRolesWidths(const QHash<QByteArray, qreal> rolesWidths)
  83 {
  84     m_visibleRolesWidths = rolesWidths;
  85     update();
  86 }
  87
  88 QHash<QByteArray, qreal> KItemListHeader::visibleRolesWidths() const
  89 {
  90     return m_visibleRolesWidths;
  91 }
  92
  93 void KItemListHeader::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  94 {
  95     Q_UNUSED(option);
  96     Q_UNUSED(widget);
  97
  98     // Draw background
  99     QStyleOption opt;
 100     opt.init(widget);
 101     opt.rect = rect().toRect();
 102     opt.state |= QStyle::State_Horizontal;
 103     style()->drawControl(QStyle::CE_HeaderEmptyArea, &opt, painter);
 104
 105     if (!m_model) {
 106         return;
 107     }
 108
 109     // Draw roles
 110     // TODO: This is a rough draft only
 111     QFontMetricsF fontMetrics(font());
 112     QTextOption textOption(Qt::AlignLeft | Qt::AlignVCenter);
 113
 114     painter->setFont(font());
 115     painter->setPen(palette().text().color());
 116
 117     const qreal margin = style()->pixelMetric(QStyle::PM_HeaderMargin);
 118     qreal x = margin;
 119     foreach (const QByteArray& role, m_visibleRoles) {
 120         const QString roleDescription = m_model->roleDescription(role);
 121         const qreal textWidth = fontMetrics.width(roleDescription);
 122         QRectF rect(x, 0, textWidth, size().height());
 123         painter->drawText(rect, roleDescription, textOption);
 124
 125         x += m_visibleRolesWidths.value(role) + margin;
 126     }
 127 }
 128
 129 void KItemListHeader::slotSortRoleChanged(const QByteArray& current, const QByteArray& previous)
 130 {
 131     Q_UNUSED(current);
 132     Q_UNUSED(previous);
 133 }
 134
 135 void KItemListHeader::slotSortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous)
 136 {
 137     Q_UNUSED(current);
 138     Q_UNUSED(previous);
 139 }
 140
 141 #include "kitemlistheader_p.moc"