Hi all,

I am a newbie using Qt and I am stuck with this problem. Let me resume ...

I am trying to display a tree containing nodes representing resource items.
Those items have several attributes (image id, ...) and booleans such as resourceVisible [true|false].

I am able to display the tree with icons representing my booleans (using a delegate). I also use a QSortFilterProxyModel to filter the rows.

Now I would like to update the model when the user click on the icon representing the boolean resourceVisible. But I can't have it work :-\

Here is my program

Structure defining a resource:

Qt Code: 
  1. struct ResourceTreeItem {
  2.  
  3. 	ResourceTreeItem(std::string resourceID=""):m_resourceID(resourceID), m_resourceVisible(true), m_contentVisible(true),
  4. 	m_boundaryBoxVisible(true), m_mosaicked(true), m_IDVisible(true) {}
  5.  
  6. 	ResourceTreeItem(const ResourceTreeItem& copy): m_resourceID(copy.m_resourceID), m_resourceVisible(copy.m_resourceVisible), m_contentVisible(copy.m_contentVisible),
  7. 	m_boundaryBoxVisible(copy.m_boundaryBoxVisible), m_mosaicked(copy.m_mosaicked), m_IDVisible(copy.m_IDVisible) {}
  8.  
  9. 	std::string m_resourceID;
  10. 	bool m_resourceVisible;
  11. 	bool m_contentVisible;
  12. 	bool m_boundaryBoxVisible;
  13. 	bool m_mosaicked;
  14. 	bool m_IDVisible;
  15. };
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A node (based on Editable Tree Model Example):

Qt Code: 
  1. class ResourceTreeNode {
  2. public:
  3.     ResourceTreeNode(const ResourceTreeItem& data, ResourceTreeNode* parent = 0);
  4.     ~ResourceTreeNode();
  5.  
  6.     QVariant data(int column) const;
  7.     bool setData(int column, const QVariant& value);
  8.     ResourceTreeNode* child(int number);
  9.     ResourceTreeNode* parent();
  10.  
  11.     int childCount() const;
  12.     int childNumber() const;
  13.     bool insertChildren(int position, int count, ResourceTreeItem resourceTreeItem);
  14.     bool removeChildren(int position, int count);
  15.  
  16. private:
  17.     ResourceTreeNode* m_parent;
  18.     ResourceTreeItem m_resourceTreeItem;
  19.     QList<ResourceTreeNode*> m_childrens;
  20.  
  21. };
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A custom model (also based on Editable Tree Model Example):

Qt Code: 
  1. class QResourceTreeModel : public QAbstractItemModel
  2. {
  3. 	Q_OBJECT
  4.  
  5. public slots:
  6. 	void itemClicked(const QModelIndex &index);
  7.  
  8. public:
  9. 	static const int NB_COLUMN = 6;
  10.  
  11. 	QResourceTreeModel(QObject *parent = 0) : QAbstractItemModel(parent), m_root(0) {}
  12.        QResourceTreeModel(ResourceTreeNode* root, QObject *parent = 0) : QAbstractItemModel(parent), m_root(root) {}
  13.  
  14. 	void setRootNode(ResourceTreeNode* node);
  15.  
  16. 	QModelIndex index(int row, int column, const QModelIndex& parent = QModelIndex()) const;
  17. 	QModelIndex parent(const QModelIndex& index) const;
  18.  
  19.  
  20. 	int rowCount(const QModelIndex &parent = QModelIndex()) const;
  21. 	int columnCount(const QModelIndex &parent = QModelIndex()) const;
  22.  
  23. 	QVariant data(const QModelIndex &index, int role) const;
  24. 	QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
  25.  
  26. private:
  27. 	ResourceTreeNode* getNode(const QModelIndex& index) const;
  28. 	ResourceTreeNode* m_root;
  29. };
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Basically I connect the signal clicked(const QModelIndex &) to my slot itemClicked(const QModelIndex &index) so I can update the corresponding cell in the tree.

Here is some key methods ...

Qt Code: 
  1. QVariant ResourceTreeNode::data(int column) const
  2. {
  3.         switch (column) {
  4. 	case 0:
  5. 		return QVariant(m_resourceTreeItem.m_resourceVisible);
  6. 	case 1:
  7. return QVariant(m_resourceTreeItem.m_resourceID.c_str());
  8. 	case 2:
  9. 		return QVariant(m_resourceTreeItem.m_contentVisible);
  10. 	case 3:
  11. 		return QVariant(m_resourceTreeItem.m_boundaryBoxVisible);
  12. 	case 4:
  13. 		return QVariant(m_resourceTreeItem.m_mosaicked);
  14. 	case 5:
  15. 		return QVariant(m_resourceTreeItem.m_IDVisible);
  16. 	default:
  17. 		return QVariant();
  18. 	}
  19.  
  20. 	return QVariant();
  21. }
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Qt Code: 
  1. bool ResourceTreeNode::setData(int column, const QVariant& value) {
  2.  
  3. 	if (column < 0 || column >= 5) {
  4. 		return false;
  5. 	}
  6.  
  7. 	switch (column) {
  8. 	case 0:
  9. 		m_resourceTreeItem.m_resourceVisible = value.toBool();
  10. 	case 1:
  11. 		m_resourceTreeItem.m_resourceID =  value.toString().toStdString();
  12. 	case 2:
  13. 		m_resourceTreeItem.m_contentVisible = value.toBool();
  14. 	case 3:
  15. 		m_resourceTreeItem.m_boundaryBoxVisible = value.toBool();
  16. 	case 4:
  17. 		m_resourceTreeItem.m_mosaicked = value.toBool();
  18. 	case 5:
  19. 		m_resourceTreeItem.m_IDVisible = value.toBool();
  20. 	default:
  21. 		break;
  22. 	}
  23.  
  24. 	return true;
  25. }
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Qt Code: 
  1. void QResourceTreeModel::itemClicked(const QModelIndex &index) {
  2.        if ((index.isValid()) && (index.column() != 1)) {
  3.  
  4.            /* The idea is to store false if it was true or true if it was false */
  5.  
  6.             ResourceTreeNode* node = getNode(index);
  7.             bool result = node->setData(index.column(), QVariant(!node->data(index.column()).toBool()));
  8.  
  9.             if (result) {
  10. 	        emit dataChanged(index, index);
  11. 	    }
  12.         }
  13. }
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My problem comes from the method ResourceTreeNode::getNode(index) in QResourceTreeModel::itemClicked(index). The returned node does not contain any ResourceTreeItem? I used a log in getNode() and the problem only happen when I call getNode() from my slot. Somebody have any hints?