Ajoutez des cases à cocher à vos modèles

Bonjour tout le monde.

Pour un besoin personnel, j'ai mis en place une classe héritant de QFileSystemModel, en rendant la première colonne Checkable.
Hors, premièrement ça ne me plaisait pas de mélanger ce comportement (ajout de checkbox) à celui de base (parcourt du système de fichiers), la transformant un peu trop en "super class".
Deuxièmement, je me suis dit que si pour un autre modèle je voulais aussi ajouter des checkbox, je devrais recommencer à zéro. Si je voulais ajouter un autre comportement en plus de rendre le modèle checkable, je devrais retravailler ma classe en profondeur.

Bref, ça ne me plaisait pas!

J'ai donc déporté toute cette partie dans un ProxyModel, histoire de rendre le tout modulable.
Premièrement, j'ai mis en place AbstractRoleProxyModel, pour mutualiser les tratements communs aux différentes classes de rôles (pour le moment, juste Checkable)
Ensuite j'ai porté ma partie Checkable dans un proxy héritant de AbstractRoleProxyModel

Je suis ouvert à toute remarque/conseil/correction avis :)


Place au code...



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/// /// \file : AbstractRoleProxyModel.h /// #ifndef ABSTRACTROLEPROXYMODEL_H #define ABSTRACTROLEPROXYMODEL_H   #include <QIdentityProxyModel> #include <QHash> #include <QByteArray>   class AbstractRoleProxyModel : public QIdentityProxyModel { Q_OBJECT public: explicit AbstractRoleProxyModel(QObject *parent = 0); virtual QHash<int, QByteArray> proxyRoleNames() const = 0; QHash<int, QByteArray> roleNames() const; signals:   public slots:   };   #endif // ABSTRACTROLEPROXYMODEL_H

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/// /// \file : CheckableRoleProxyModel.cpp ///   /// /// CheckableRoleProxyModel: a Qt proxy model to add the checkable role /// to your models /// /// Copyright (C) 2013  Pascal Blétard <bletard.p@live.fr> /// /// This program is free software: you can redistribute it and/or modify /// it under the terms of the GNU General Public License as published by /// the Free Software Foundation, either version 3 of the License, or /// (at your option) any later version. /// This program is distributed in the hope that it will be useful, /// but WITHOUT ANY WARRANTY; without even the implied warranty of /// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the /// GNU General Public License for more details. /// You should have received a copy of the GNU General Public License /// along with this program.  If not, see <http://www.gnu.org/licenses/>. /// /// \date 06/08/2013 /// \version 0.1 /// \author Pascal Blétard ///   #ifndef CHECKABLEROLEPROXYMODEL_H #define CHECKABLEROLEPROXYMODEL_H   #include "AbstractRoleProxyModel.h" #include <QSet> #include <QHash> #include <QMap> #include <QDebug>   class CheckableRoleProxyModel : public AbstractRoleProxyModel { Q_OBJECT       public:       CheckableRoleProxyModel(QObject *parent = 0);     /// /// \brief The Priority enum /// /// \see checkablePriority() /// \see setCheckablePriority() /// enum Priority { Indices, Columns, Rows };     /// /// \brief   Returns the item flags for the given index in the model. /// /// The flags are an \c OR combination of this values: /// \htmlonly /// <table> /// <tr><td>Qt::NoItemFlags          </td><td>   0   </td><td>   It does not have any properties set.                </td></tr> /// <tr><td>Qt::ItemIsSelectable     </td><td>   1   </td><td>   It can be selected.                                 </td></tr> /// <tr><td>Qt::ItemIsEditable       </td><td>   2   </td><td>   It can be edited.                                   </td></tr> /// <tr><td>Qt::ItemIsDragEnabled    </td><td>   4   </td><td>   It can be dragged.                                  </td></tr> /// <tr><td>Qt::ItemIsDropEnabled    </td><td>   8   </td><td>   It can be used as a drop target.                    </td></tr> /// <tr><td>Qt::ItemIsUserCheckable  </td><td>   16  </td><td>   It can be checked or unchecked by the user.         </td></tr> /// <tr><td>Qt::ItemIsEnabled        </td><td>   32  </td><td>   The user can interact with the item.                </td></tr> /// <tr><td>Qt::ItemIsTristate       </td><td>   64  </td><td>   The item is checkable with three separate states.   </td></tr> /// <tr><td>Qt::ItemNeverHasChildren </td><td>   128 </td><td>   The item never has child items.                     </td></tr> /// </table> /// \endhtmlonly /// Qt::ItemFlags flags(const QModelIndex& index) const;       /// /// \brief  Returns the data for the model item index with the given role /// \param  index /// \param  role /// \return The requested data if successful; otherwise an invalid QVariant() empty data /// QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const;     /// /// \brief  Sets the data for the model item index with the given role ///         to the data referenced by the value. /// /// The dataChanged() signal should be emitted if the data was successfully set. /// /// \param  index /// \param  value /// \param  role /// \return Returns true if successful; otherwise returns false. /// bool setData(const QModelIndex& index, const QVariant& value, int role = Qt::EditRole);       /// /// \brief  Returns a map with values for all predefined roles in the model for the item at the given index. /// \param  index /// \param  role /// \return All predefiened datas if successful; otherwise an invalid QVariant() empty data /// QMap<int, QVariant> itemData(const QModelIndex& index) const;       // want to be implements? How it work... //bool setItemData(const QModelIndex& index, const QMap<int, QVariant>& roles);       /// /// \brief Returns the proxies role names. /// /// Returns a pairs list of Qt::ItemDataRole with their labels, /// used in the proxy. /// /// \return /// QHash<int, QByteArray> proxyRoleNames() const;       /// /// \brief  Retrieves if an index is checkable or not. /// /// By default, class verifies first if index is checkable, /// then if column is checkable and finally if row is checkable. /// This behavior can be changed by use of setCheckablePriority() /// /// \see    checkablePriority() /// \see    setCheckablePriority() /// \see    indexCheckable() /// \see    columnCheckable() /// \see    rowCheckable() /// \param  index /// \return /// bool checkable(const QModelIndex& index) const;       /// /// \brief  Retrieves if an index is checkable or not. /// /// Only seek in parameters of index, regardless of settings of column or of row /// /// \note   To verify if an index is really Checkable, use checkable() /// \see    checkable() /// \see    setIndexCheckable() /// \see    columnCheckable() /// \see    rowCheckable() /// \param  index /// \return Returns true if index is Checkable; otherwise returns false. /// bool indexCheckable(const QModelIndex& index) const;       /// /// \brief  Retrieves if the column of an index is checkable or not. /// /// Only seek in parameters of the indice's column, regardless of settings of index or of row /// /// \note   To verify if an index is really Checkable, use checkable() /// \see    checkable() /// \see    setColumnCheckable() /// \see    indexCheckable() /// \see    rowCheckable() /// \param  index /// \return Returns true if the indice's column is Checkable; otherwise returns false. /// bool columnCheckable(const QModelIndex& index) const;       /// /// \brief  Retrieves if the column is checkable or not. /// /// Only seek in parameters of the column, regardless of settings of index or of row /// /// \note   To verify if an index is really Checkable, use checkable() /// \see    checkable() /// \see    setColumnCheckable() /// \see    indexCheckable() /// \see    rowCheckable() /// \param  index /// \return Returns true if the column is Checkable; otherwise returns false. /// inline bool columnCheckable(int column) const { return m_checkable_columns.value(column, false); }       /// /// \brief  Retrieves if the row of an index is checkable or not. /// /// Only seek in parameters of the indice's row, regardless of settings of index or of column /// /// \note   In case of a tree type model, ///         all children's indices with this row's number are checkable. /// \note   To verify if an index is really Checkable, use checkable() /// \see    checkable() /// \see    setRowCheckable() /// \see    indexCheckable() /// \see    columnCheckable() /// \param  index /// \return Returns true if the indice's row is Checkable; otherwise returns false. /// bool rowCheckable(const QModelIndex& index) const;       /// /// \brief  Retrieves if the row is checkable or not. /// /// Only seek in parameters of the row, regardless of settings of index or of column /// /// \note   In case of a tree type model, ///         all children's indices with this row's number are checkable. /// \note   To verify if an index is really Checkable, use checkable() /// \see    checkable() /// \see    setRowCheckable() /// \see    indexCheckable() /// \see    columnCheckable() /// \param  index /// \return Returns true if the row is Checkable; otherwise returns false. /// inline bool rowCheckable(int row) const { return m_checkable_rows.value(row, false); }     /// /// \brief  Sets an precise index Checkable or not. /// /// \see    checkable() /// \see    indexCheckable() /// \see    setColumnCheckable() /// \see    setRowCheckable() /// \param  index The index sets to be Checkable /// \param  checkable Does the column is Checkable or not /// \return Returns true if successful; otherwise returns false /// bool setIndexCheckable(const QModelIndex& index, bool checkable = true, Qt::CheckState state = Qt::Unchecked);       /// /// \brief  Sets column of an index Checkable or not. /// /// \see    checkable() /// \see    columnCheckable() /// \see    setIndexCheckable() /// \see    setRowCheckable() /// \param  index The index whose column is set to Checkable /// \param  checkable Does the column is Checkable or not /// \return Returns true if successful; otherwise returns false /// bool setColumnCheckable(const QModelIndex& index, bool checkable = true);       /// /// \brief  Sets column Checkable or not. /// /// \see    checkable() /// \see    columnCheckable() /// \see    setIndexCheckable() /// \see    setRowCheckable() /// \param  column The number of the column to set Checkable /// \param  checkable Does the column is Checkable or not /// \return Returns true if successful; otherwise returns false /// bool setColumnCheckable(int column = 0, bool checkable = true);       /// /// \brief  Sets row of an index Checkable or not. /// /// \note   In case of a tree type model, ///         all indices with the same row's number become checkable. /// \see    checkable() /// \see    rowCheckable() /// \see    setIndexCheckable() /// \see    setColumnCheckable() /// \param  index The index whose row is set to Checkable /// \param  checkable Does the row is Checkable or not /// \return Returns true if successful; otherwise returns false /// bool setRowCheckable(const QModelIndex& index, bool checkable = true);       /// /// \brief  Sets row Checkable or not. /// /// \note   In case of a tree type model, ///         all indices with this row's number become checkable. /// \see    checkable() /// \see    rowCheckable() /// \see    setIndexCheckable() /// \see    setColumnCheckable() /// \param  row The number of the row to set Checkable /// \param  checkable Does the row is Checkable or not /// \return Returns true if successful; otherwise returns false /// bool setRowCheckable(int row, bool checkable = true);       /// /// \brief  Returns the order of priorities used by the class ///         to see if an index is Checkable or not. /// /// By default, class verifies first if index is checkable, /// then if column is checkable and finally if row is checkable. /// This behavior can be changed by use of setCheckablePriority() /// /// \see    Priority /// \see    setCheckablePriority() /// \see    checkable() /// \return /// inline QSet<Priority> checkablePriority() const { return m_priorities; }       /// /// \brief Sets the order of priorities used by the class ///        to see if an index is Checkable or not. /// /// By default, class verifies first if index is checkable, /// then if column is checkable and finally if row is checkable. /// This behavior can be changed by use of setCheckablePriority() /// /// If a column was set as prioritary and is Checkable, /// every indices of the column will be consid as Checkable /// regardless of index/row settings. /// /// \note   You can't send twice the same Priority. /// \see    Priority /// \see    checkablePriority() /// \see    checkable() /// \param first Priority The first to verify /// \param second Priority Second to verify /// \param third Priority Third and last to verify /// \return Returns true if successful; otherwise returns false. /// bool setCheckablePriority(Priority first,Priority second,Priority third);       /// /// \brief Sets the order of priorities used by the class ///        to see if an index is Checkable or not. /// /// By default, class verifies first if index is checkable, /// then if column is checkable and finally if row is checkable. /// This behavior can be changed by use of setCheckablePriority() /// /// If a column was set as prioritary and is Checkable, /// every indices of the column will be consid as Checkable /// regardless of index/row settings. /// /// \note   You can't send twice the same Priority. /// \see    Priority /// \see    checkablePriority() /// \see    checkable() /// \param  priorities \c QSet of the third priorities /// \return Returns true if successful; otherwise returns false. /// bool setCheckablePriority(QSet<Priority> priorities);       /// /// \brief  Retrieves if Unchecked parents of the Checked indices ///         must be PartiallyChecked or not. /// \note   Only consistent with a tree type model /// \return /// inline bool partiallyCheckParents() const { return m_partially_check_parents; }       /// /// \brief  Sets if Unchecked parents of the Checked indices ///         must be PartiallyChecked or not. /// \note   Only consistent with a tree type model /// \return /// void setPartiallyCheckParents(bool partially_check_parents);       /// /// \brief   Turns an index as checked /// /// If  \c partiallyCheckParents(true) was called, /// parents are partially checked too if they aren't already checked. /// /// \see     partiallyCheckParents() /// \see     setPartiallyCheckParents() /// \see     uncheck() /// \see     toggleCheck() /// \see     checked() /// \param   index The\c QModelIndex of the item in the model to uncheck /// \return  Returns true if successful; otherwise returns false. /// inline bool check(QModelIndex index) { return setData(index, Qt::Checked, Qt::CheckStateRole); }       /// /// \brief   Turns an index as unchecked /// /// If  \c partiallyCheckParents(true) was called, parents partially checked /// who haven't another checked childs are unchecked too. /// /// \see     partiallyCheckParents() /// \see     setPartiallyCheckParents() /// \see     check() /// \see     toggleCheck() /// \see     checked() /// \param   index The\c QModelIndex of the item in the model to uncheck /// \return  Returns true if successful; otherwise returns false. /// inline bool uncheck(QModelIndex index) { return setData(index, Qt::Unchecked, Qt::CheckStateRole); }       /// /// Toggles an index between the checked and unchecked state /// /// If the \c CheckableRoleProxyModel::_partiallyCheckParents flag is active, /// parent's checked states follow rules explained for check() and uncheck(). /// /// \see     partiallyCheckParents() /// \see     setPartiallyCheckParents() /// \see     check() /// \see     uncheck() /// \see     checked() /// \param   index The\c QModelIndex of the item in the model to toggle checked state. /// \return  Returns true if successful; otherwise returns false. /// bool toggleCheck(QModelIndex index);       /// /// Retrieves the checked state of an index /// /// \see     check() /// \see     uncheck() /// \see     toggleCheck() /// \param   index The\c QModelIndex of the item in the model to retrieve checked state. /// \return  Returns true if is checked; otherwise returns false. /// bool checked(QModelIndex index) const;         /// /// Returns a list with all checked indices /// /// \return  Returns a \c QSet<QModelIndex> filled with Checked indices; ///          otherwise if there is no index Checked an empty \c QSet<QModelIndex> /// inline QSet<QModelIndex> checkedIndices() { return m_checked; }       signals:       /// /// \brief  This signal is emitted whenever the checked state has toggled. /// /// \see    checkStateChanged() /// \see    check() /// \see    uncheck() /// \see    toggleCheck() /// \see    checked() /// \param  index The toggled index /// void checkStateChanged(const QModelIndex index);       /// /// \brief  This signal is emitted whenever the checked state has toggled. /// /// \see    checkStateChanged() /// \see    check() /// \see    uncheck() /// \see    toggleCheck() /// \see    checked() /// \param  index QModelIndex The toggled index /// \param  state Qt::CheckState The new state /// void checkStateChanged(const QModelIndex index, const int state);       private:       /// /// \internal Recursivly sets the PartiallyChecked state on parents when ///           an index was Checked. /// /// This function is called only if partiallyCheckParents(true) was called /// on a tree type model. /// /// \see partiallyCheckParents() /// \see setPartiallyCheckParents() /// \see check() /// \see toggleCheck /// void _partiallyCheckParents(const QModelIndex index);       /// /// \internal Recursivly unsets the PartiallyChecked state on parents when ///           an index was Unchecked. /// /// This function is called only if partiallyCheckParents(true) was called /// on a tree type model. /// /// \see partiallyCheckParents() /// \see setPartiallyCheckParents() /// \see check() /// \see toggleCheck /// void _partiallyUncheckParents(const QModelIndex index);       /// /// \internal Pairs of indices/booleans which define ///           if index is checkable or not. /// QHash<QModelIndex, bool> m_checkable_index;   /// /// \internal Pairs of columns number/booleans which define ///           if column is checkable or not. /// QHash<int, bool> m_checkable_columns;   /// /// \internal Pairs of rows number/booleans which define ///           if row is checkable or not. /// /// In case of a tree type model, all children's indices /// with this row's number become checkable. /// QHash<int, bool> m_checkable_rows;   /// /// \internal A list of all checked indices (refers to the proxy). /// QSet<QModelIndex> m_checked;   /// /// \internal A list of all partially checked indices. /// /// Empty if partiallyCheckParents(true) wasn't called /// or if Model isn't a tree type model. /// QSet<QModelIndex> m_partially_checked;   /// /// \internal The priorities order  for determine if a index is checkable or not. /// QSet<Priority> m_priorities;   /// /// \internal Determines if unchecked parents must be partially checked ///           if they have some checked children. /// bool m_partially_check_parents; };   #endif // CHECKABLEROLEPROXYMODEL_H

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/// /// \file : AbstractRoleProxyModel.cpp ///   #include "AbstractRoleProxyModel.h"   AbstractRoleProxyModel::AbstractRoleProxyModel(QObject *parent) : QIdentityProxyModel(parent) { }   QHash<int, QByteArray> AbstractRoleProxyModel::roleNames() const { if (sourceModel()) { QHash<int, QByteArray> source_role_names = sourceModel()->roleNames(); QHash<int, QByteArray> proxy_role_names = proxyRoleNames();   foreach (int role, proxy_role_names.keys()) { source_role_names.insert(role, proxy_role_names[role]); } return source_role_names; } return proxyRoleNames(); }

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/// /// \file : CheckableRoleProxyModel.cpp ///   #include "CheckableRoleProxyModel.h"     // ---------------------- // ---- Constructors ---- // ----------------------       CheckableRoleProxyModel::CheckableRoleProxyModel(QObject *parent) : AbstractRoleProxyModel(parent) { m_priorities.insert(Indices); m_priorities.insert(Columns); m_priorities.insert(Rows);   m_partially_check_parents = false; }       // ---------------------- // ---- Reimplements ---- // ----------------------       Qt::ItemFlags CheckableRoleProxyModel:: flags(const QModelIndex& index) const { if (!index.isValid()) { return Qt::NoItemFlags; } QModelIndex source_index = mapToSource(index); Qt::ItemFlags flag = sourceModel()->flags(source_index);   //set flag to have only first column checkable for the whole list if (checkable(index)) { flag |= Qt::ItemIsUserCheckable; } return flag; }       QVariant CheckableRoleProxyModel:: data(const QModelIndex& index, int role) const { if (!index.isValid()) { return QVariant(); } QModelIndex source_index = mapToSource(index); // If index is checkable if (role == Qt::CheckStateRole && checkable(index)) { // item checked only if we have stored its path if (m_checked.contains(source_index)) { return QVariant(Qt::Checked); } if (m_partially_check_parents && m_partially_checked.contains(source_index)) { return QVariant(Qt::PartiallyChecked); } return QVariant(Qt::Unchecked); } return sourceModel()->data(source_index, role); }       QMap<int, QVariant> CheckableRoleProxyModel:: itemData(const QModelIndex& index) const { QModelIndex source_index = mapToSource(index); QMap<int, QVariant> map = sourceModel()->itemData(source_index); QVariant index_data = data(index, Qt::CheckStateRole); map.insert(Qt::CheckStateRole, index_data); return map; }       bool CheckableRoleProxyModel:: setData(const QModelIndex& index, const QVariant& value, int role) { if (!index.isValid()) { return false; } QModelIndex source_index = mapToSource(index); if (role == Qt::CheckStateRole && checkable(index)) { switch(value.toInt()) { // save checked paths case Qt::Checked: if (!m_checked.contains(source_index)) { m_checked.insert(source_index); } if (m_partially_check_parents) { _partiallyCheckParents(source_index); } break;   // remove unchecked paths case Qt::Unchecked: // current index is checked? Damned! Go die in hell! if (m_checked.contains(source_index)) { m_checked.remove(source_index); } // if (m_partially_check_parents) { _partiallyUncheckParents(source_index); } break; } emit checkStateChanged(source_index); emit checkStateChanged(source_index, value.toInt()); QVector<int> roles; roles.append(role); emit dataChanged(index, index, roles); return true; } return sourceModel()->setData(source_index, value, role); }       QHash<int, QByteArray> CheckableRoleProxyModel:: proxyRoleNames() const { QHash<int, QByteArray> roles; roles.insert(Qt::CheckStateRole, QByteArray("checkState")); return roles; }       // ------------------ // ---- Features ---- // ------------------   bool CheckableRoleProxyModel:: checkable(const QModelIndex& index) const { if (!index.isValid()) { return false; } foreach(Priority priority, m_priorities) { switch (priority) { case Indices : { if (m_checkable_index.contains(index)) { return indexCheckable(index); } break; } case Columns : { if (m_checkable_columns.contains(index.column())) { return columnCheckable(index.column()); } break; } case Rows : { if (m_checkable_rows.contains(index.row())) { return rowCheckable(index.row()); } } } } return false; }       bool CheckableRoleProxyModel:: indexCheckable(const QModelIndex& index) const { if (!index.isValid()) { return false; } return m_checkable_index.value(index, false); }       bool CheckableRoleProxyModel:: columnCheckable(const QModelIndex& index) const { if (!index.isValid()) { return false; } return columnCheckable(index.column()); }       bool CheckableRoleProxyModel:: rowCheckable(const QModelIndex& index) const { if (!index.isValid()) { return false; } return rowCheckable(index.row()); }       bool CheckableRoleProxyModel:: setIndexCheckable(const QModelIndex& index, bool checkable, Qt::CheckState state) { if (!index.isValid()) { return false; } m_checkable_index.insert(index, checkable);   if (state == Qt::Checked) { check(index); } return true; }       bool CheckableRoleProxyModel:: setColumnCheckable(const QModelIndex& index, bool checkable) { if (!index.isValid()) { return false; } return setColumnCheckable(index.column(), checkable); }       bool CheckableRoleProxyModel:: setColumnCheckable(int column, bool checkable) { if (column <0) { return false; } m_checkable_columns.insert(column, checkable); return true; }       bool CheckableRoleProxyModel:: setRowCheckable(const QModelIndex& index, bool checkable) { if (!index.isValid()) { return false; } return setRowCheckable(index.row(), checkable); }       bool CheckableRoleProxyModel:: setRowCheckable(int row, bool checkable) { if (row < 0) { return false; } m_checkable_rows.insert(row, checkable); return true; }       bool CheckableRoleProxyModel:: setCheckablePriority(Priority first,Priority second,Priority third) { QSet<Priority> priorities; priorities.insert(first); priorities.insert(second); priorities.insert(third); return setCheckablePriority(priorities); }       bool CheckableRoleProxyModel:: setCheckablePriority(QSet<Priority> priorities) { if (priorities.size() == 3) { m_priorities = priorities; return true; } return false; }       void CheckableRoleProxyModel:: setPartiallyCheckParents(bool partially_check_parents) { // only if setting have changed if (m_partially_check_parents != partially_check_parents) { m_partially_check_parents = partially_check_parents; if (partially_check_parents) { // partially check parents for each checked index foreach(QModelIndex index, m_checked) { _partiallyCheckParents(index); } } else { m_partially_checked.clear(); } emit layoutChanged(); } }       bool CheckableRoleProxyModel:: toggleCheck(const QModelIndex index) { if (checked(index)) { return uncheck(index); } return check(index); }       bool CheckableRoleProxyModel:: checked(const QModelIndex index) const { return (Qt::Checked == (Qt::CheckState)index.data(Qt::CheckStateRole).toInt()); }   // ------------------- // ----- Private ----- // -------------------     void CheckableRoleProxyModel:: _partiallyCheckParents(const QModelIndex index) { // source's parent exists? QModelIndex source_parent = index.parent(); if (source_parent.isValid()) {   // if proxy parent index is checkable but not partially checked QModelIndex proxy_parent = mapFromSource(source_parent); bool partially_checked = m_partially_checked.contains(source_parent);   if (checkable(proxy_parent) && !partially_checked) { // partially check parent and notify it m_partially_checked.insert(source_parent); emit dataChanged(proxy_parent, proxy_parent); } // if parent is checkable (or not), maybe his ancestors are _partiallyCheckParents(source_parent); } }       void CheckableRoleProxyModel:: _partiallyUncheckParents(const QModelIndex index) { // source parent exists? QModelIndex source_parent = index.parent(); if (source_parent.isValid()) {   // if proxy parent index is checkable and partially checked QModelIndex proxy_parent = mapFromSource(source_parent); bool partially_checked = m_partially_checked.contains(source_parent);   if (checkable(proxy_parent) && partially_checked) { bool childChecked = false; // check if parent have another checked childs for (int i = 0; source_parent.child(i,0).isValid(); ++i) { partially_checked = m_partially_checked.contains(source_parent.child(i,0)); bool checked = m_checked.contains(source_parent.child(i,0)); if(partially_checked || checked) { childChecked = true; break; } } // If not, uncheck it if (!childChecked) { m_partially_checked.remove(source_parent); emit dataChanged(proxy_parent, proxy_parent); } //todo: verify not after } _partiallyUncheckParents(source_parent);   } } }

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/// /// \file : FileSystemModel.h ///   #ifndef FILESYSTEMMODEL_H #define FILESYSTEMMODEL_H   #include <QFileSystemModel>   class FileSystemModel : public QFileSystemModel { Q_OBJECT public:   /// /// Returns true if parent has any children or has the Qt::ItemNeverHasChildren flag set; /// otherwise returns false. /// /// Use rowCount() on the parent to find out the number of children. /// /// \remarks Reimplemented to avoid empty directories to be collapsables ///          and to implement the \c Qt::ItemNeverHasChildren flag. /// \see     rowCount() /// \see     child() /// /// bool hasChildren(const QModelIndex &parent) const; };   #endif // FILESYSTEMMODEL_H

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/// /// \file : Window.h ///   #ifndef WINDOW_H #define WINDOW_H   #include <QWidget> #include <QTreeView> #include <QGridLayout>   #include "../src/FileSystemModel.h" #include "../src/CheckableRoleProxyModel.h"   class Window : public QWidget { Q_OBJECT   public: Window(QWidget *parent = 0); };   #endif // WINDOW_H

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/// /// \file : FileSystemModel.cpp ///   #include "FileSystemModel.h"   bool FileSystemModel::hasChildren(const QModelIndex &parent) const { // return false if item cant have children if (parent.flags() & Qt::ItemNeverHasChildren) { return false; } // return if at least one child exists return QDirIterator(filePath(parent), filter() | QDir::NoDotAndDotDot, QDirIterator::NoIteratorFlags ).hasNext(); }

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/// /// \file : Windowcpp ///   #include "Window.h"   Window::Window(QWidget *parent) : QWidget(parent) { FileSystemModel* model = new FileSystemModel(); model->setRootPath("");   CheckableRoleProxyModel* checkable = new CheckableRoleProxyModel(this); checkable->setColumnCheckable(0, true); checkable->setPartiallyCheckParents(true);   checkable->setSourceModel(model);   QTreeView * m_dir = new QTreeView; m_dir->setModel(checkable);   QGridLayout * layout = new QGridLayout; layout->addWidget(m_dir, 0, 0, 6, 8); setLayout(layout); }

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/// /// \file : main.cpp ///   #include "Window.h" #include <QApplication>   int main(int argc, char *argv[]) { QApplication a(argc, argv); Window w; w.show();   return a.exec(); }

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