src/HEXABLOCKGUI/klinkitemselectionmodel.hxx

   1 /*
   2     Copyright (C) 2010 Klarälvdalens Datakonsult AB,
   3         a KDAB Group company, info@kdab.net,
   4         author Stephen Kelly <stephen@kdab.com>
   5
   6     This library is free software; you can redistribute it and/or modify it
   7     under the terms of the GNU Library General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or (at your
   9     option) any later version.
  10
  11     This library is distributed in the hope that it will be useful, but WITHOUT
  12     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  14     License for more details.
  15
  16     You should have received a copy of the GNU Library General Public License
  17     along with this library; see the file COPYING.LIB.  If not, write to the
  18     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19     02110-1301, USA.
  20 */
  21
  22 #ifndef KLINKITEMSELECTIONMODEL_H
  23 #define KLINKITEMSELECTIONMODEL_H
  24
  25 #include <QtCore/QObject>
  26 #include <QtGui/QItemSelectionModel>
  27 #include <QtGui/QAbstractProxyModel>
  28
  29 #include <iostream>
  30
  31 // #include "kdeui_export.h"
  32 // #include "klinkitemselectionmodel_p.hxx"
  33
  34 #include "kmodelindexproxymapper.hxx"
  35
  36 class KLinkItemSelectionModelPrivate;
  37
  38 class KLinkItemSelectionModel : public QItemSelectionModel
  39 {
  40     Q_OBJECT
  41 public:
  42     KLinkItemSelectionModel(QAbstractItemModel *targetModel, QItemSelectionModel *linkedItemSelectionModel, QObject *parent = 0);
  43     ~KLinkItemSelectionModel();
  44     /* reimp */ void select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command);
  45     /* reimp */ void select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command);
  46
  47 protected:
  48     KLinkItemSelectionModelPrivate * const d_ptr;
  49
  50 private:
  51     Q_DECLARE_PRIVATE(KLinkItemSelectionModel)
  52     Q_PRIVATE_SLOT( d_func(), void sourceSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected))
  53
  54 };
  55
  56
  57 // QAbstractProxyModel::mapSelectionFromSource creates invalid ranges to we filter
  58 // those out manually in a loop. Hopefully fixed in Qt 4.7.2, so we ifdef it out.
  59 // http://qt.gitorious.org/qt/qt/merge_requests/2474
  60 // http://qt.gitorious.org/qt/qt/merge_requests/831
  61 #if QT_VERSION < 0x040702
  62 #define RANGE_FIX_HACK
  63 #endif
  64
  65 #ifdef RANGE_FIX_HACK
  66 static QItemSelection klink_removeInvalidRanges(const QItemSelection &selection)
  67 {
  68 //   std::cout<< " klink_removeInvalidRanges " << std::endl;
  69   QItemSelection result;
  70   Q_FOREACH(const QItemSelectionRange &range, selection)
  71   {
  72
  73 //    Q_FOREACH(const QModelIndex &i, range.indexes ())
  74 //    {
  75 ////       std::cout<< " =====> " << i.data().toString().toStdString() << std::endl;
  76 //    }
  77     if (!range.isValid())
  78       continue;
  79 //     std::cout<< " is VALID !!"<< std::endl;
  80     result << range;
  81   }
  82   return result;
  83 }
  84 #endif
  85
  86
  87 class KLinkItemSelectionModelPrivate
  88 {
  89 public:
  90     KLinkItemSelectionModelPrivate(KLinkItemSelectionModel *proxySelectionModel, QAbstractItemModel *model,
  91                                     QItemSelectionModel *linkedItemSelectionModel)
  92       : q_ptr(proxySelectionModel),
  93         m_model(model),
  94         m_linkedItemSelectionModel(linkedItemSelectionModel),
  95         m_ignoreCurrentChanged(false),
  96         m_indexMapper(new KModelIndexProxyMapper(model, linkedItemSelectionModel->model(), proxySelectionModel))
  97     {
  98     }
  99
 100     Q_DECLARE_PUBLIC(KLinkItemSelectionModel)
 101     KLinkItemSelectionModel * const q_ptr;
 102
 103
 104     bool assertSelectionValid(const QItemSelection &selection) const {
 105       foreach(const QItemSelectionRange &range, selection) {
 106 //         if (!range.isValid()) {
 107 //           kDebug() << selection;
 108 //         }
 109
 110         Q_ASSERT(range.isValid());
 111       }
 112       return true;
 113     }
 114
 115 void sourceSelectionChanged(const QItemSelection& selected, const QItemSelection& deselected)
 116 {
 117
 118
 119     Q_Q(KLinkItemSelectionModel);
 120 #ifdef RANGE_FIX_HACK
 121 //     std::cout<<"XXXXXXXXXXXXX  sourceSelectionChanged!!!!!!!! RANGE_FIX_HACK"<<std::endl;
 122     QItemSelection _selected = klink_removeInvalidRanges(selected);
 123     QItemSelection _deselected = klink_removeInvalidRanges(deselected);
 124 #else
 125 //     std::cout<<"XXXXXXXXXXXXX  sourceSelectionChanged!!!!!!!! "<<std::endl;
 126     QItemSelection _selected = selected;
 127     QItemSelection _deselected = deselected;
 128 #endif
 129     Q_ASSERT(assertSelectionValid(_selected));
 130     Q_ASSERT(assertSelectionValid(_deselected));
 131
 132 //     std::cout << "XXXXXXXXXXXXX  _selected.count() "   << _selected.count() << std::endl;
 133 //     std::cout << "XXXXXXXXXXXXX  _deselected.count() " << _deselected.count() << std::endl;
 134
 135     const QItemSelection mappedDeselection = m_indexMapper->mapSelectionRightToLeft(_deselected);
 136     const QItemSelection mappedSelection   = m_indexMapper->mapSelectionRightToLeft(_selected);
 137
 138 //     const QItemSelection mappedDeselection = _deselected;
 139 //     const QItemSelection mappedSelection   = _selected;
 140
 141 //     std::cout << "XXXXXXXXXXXXX  mappedSelection.count() "   << mappedSelection.count() << std::endl;
 142 //     std::cout << "XXXXXXXXXXXXX  mappedDeselection.count() " << mappedDeselection.count() << std::endl;
 143
 144     q->QItemSelectionModel::select(mappedDeselection, QItemSelectionModel::Deselect);
 145     q->QItemSelectionModel::select(mappedSelection, QItemSelectionModel::Select);
 146
 147 //     q->select(mappedDeselection, QItemSelectionModel::Deselect);
 148 //     q->select(mappedSelection, QItemSelectionModel::Select);
 149
 150
 151 }
 152
 153     QAbstractItemModel * const m_model;
 154     QItemSelectionModel * const m_linkedItemSelectionModel;
 155     bool m_ignoreCurrentChanged;
 156     KModelIndexProxyMapper * const m_indexMapper;
 157 };
 158
 159
 160
 161 #endif