This is all Qt 4.8:

There is a custom model, FileCopyItemModel, that implements the QAbstractItemModel to hold a list of files that need to be copied. The list of files and their properties are stored in another class (ImageCopyDTO) so QList<ImageCopyDTO> is the actual collection of data. When a QTableView's model is set to an instance of FileCopyItemModel, the columns get their names from headerData(), but no data is ever displayed. The QList<ImageCopyDTO> has elements, but the FileCopyItemModel::data() never gets called. Any idea why?

FileCopyItemModel.h
Qt Code: 
  1. typedef QList<ImageCopyDTO> ImageCopyDTOList;
  2.  
  3. class FileCopyItemModel: public QAbstractItemModel
  4. {
  5. 	Q_OBJECT
  6.  
  7. public:
  8.  
  9. 	int relativePathNo() const { return 0; }
  10. 	int noCopyNo() const { return 1; }
  11. 	int imageName2CopyNo() const { return 2; }
  12. 	int filesCopyCntNo() const { return 3; }
  13. 	int qtyNo() const { return 4; }
  14. 	int productNameNo() const { return 5; }
  15. 	int notesNo() const { return 6; }
  16.  
  17. 	explicit FileCopyItemModel(QObject *parent = 0);
  18. 	~FileCopyItemModel();
  19.  
  20. 	virtual QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const ;
  21.     virtual QModelIndex parent(const QModelIndex &child) const;
  22.     virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
  23.     virtual int columnCount(const QModelIndex &parent = QModelIndex()) const;
  24.     virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
  25. 	bool setData( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole );
  26.  
  27. 	void clear() { _data.clear(); }
  28.  
  29. 	QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
  30. 	Qt::ItemFlags flags(const QModelIndex &index) const override;
  31.  
  32. 	// classic
  33. 	void append(const ImageCopyDTO& element) { _data.append(element); }
  34. 	ImageCopyDTOList getElementsFromData() const { return _data; }
  35.  
  36. private:
  37. 	ImageCopyDTOList _data;
  38. };
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Qt Code: 
  1. FileCopyItemModel::FileCopyItemModel(QObject *parent)
  3. {
  4. }
  5.  
  6. FileCopyItemModel::~FileCopyItemModel(void)
  7. {
  8. }
  9.  
  10. QModelIndex FileCopyItemModel::index(int row, int column, const QModelIndex &parent /*= QModelIndex()*/) const 
  11. {
  12. 	return QModelIndex();
  13. }
  14.  
  15. QModelIndex FileCopyItemModel::parent(const QModelIndex &child) const
  16. {
  17. 	return QModelIndex();
  18. }
  19.  
  20. int FileCopyItemModel::rowCount(const QModelIndex &parent /*= QModelIndex()*/) const
  21. {
  22. 	return _data.count();
  23. }
  24.  
  25. int FileCopyItemModel::columnCount(const QModelIndex &parent /*= QModelIndex()*/) const
  26. {
  27. 	return 7;
  28. }
  29.  
  30. bool FileCopyItemModel::setData( const QModelIndex & index, const QVariant & value, int role /*= Qt::EditRole*/ )
  31. {
  32. 	bool result = false;
  33.  
  34. 	int row = index.row();
  35. 	int column = index.column();
  36.  
  37. 	if (!index.isValid() || row >= rowCount() || column >= columnCount()) 
  38. 	{
  39. 		return result;
  40. 	}
  41.  
  42. 	if(role == Qt::EditRole) 
  43. 	{
  44. 		switch (column) {
  45. 		case 1:
  46. 			_data[row].setNoCopy(value.toBool());
  47. 			result = true;
  48. 			break;
  49. 		case 2:
  50. 			_data[row].setImageName2Copy(value.toString());
  51. 			result = true;
  52. 			break;
  53. 		case 3:
  54. 			_data[row].setFilesCopyCnt(value.toInt());
  55. 			result = true;
  56. 			break;
  57. 		default:
  58. 			break;
  59. 		} // end switch column
  60. 	}
  61.  
  62. 	return result;
  63. }
  64.  
  65. QVariant FileCopyItemModel::data(const QModelIndex &index, int role) const
  66. {
  67. 	QVariant result;
  68.  
  69. 	int row = index.row();
  70. 	int column = index.column();
  71.  
  72. 	if (!index.isValid() || row >= rowCount() || column >= columnCount()) 
  73. 	{
  74. 		return result;
  75. 	}
  76.  
  77. 	switch (role) 
  78. 	{
  79. 	case Qt::DisplayRole:
  80. 		// checking row and column to get data
  81. 		switch (column) {
  82. 		case 0:
  83. 			result = _data.at(row).relativePath();
  84. 			break;
  85. 		case 1:
  86. 			result = _data.at(row).noCopy();
  87. 			break;
  88. 		case 2:
  89. 			result = _data.at(row).imageName2Copy();
  90. 			break;
  91. 		case 3:
  92. 			result = _data.at(row).filesCopyCnt();
  93. 			break;
  94. 		case 4:
  95. 			result = _data.at(row).qty();
  96. 			break;
  97. 		case 5:
  98. 			result = _data.at(row).productName();
  99. 			break;
  100. 		case 6:
  101. 			result = _data.at(row).notes();
  102. 			break;
  103. 		default:
  104. 			break;
  105. 		} // end switch column
  106. 		break;
  107. 	default:
  108. 		break;
  109. 	}
  110.  
  111. 	return result;
  112. }
  113.  
  114. QVariant FileCopyItemModel::headerData(int section, Qt::Orientation orientation, int role /*= Qt::DisplayRole*/) const 
  115. {
  116. 	QVariant result = QVariant();
  117.  
  118. 	if (Qt::DisplayRole == role && Qt::Horizontal == orientation) 
  119. 	{
  120. 		switch (section) 
  121. 		{
  122. 		case 0:
  123. 			result = "Copy";
  124. 			break;
  125. 		case 1:
  126. 			result = "Image Gallery";
  127. 			break;
  128. 		case 2:
  129. 			result = "Image";
  130. 			break;
  131. 		case 3:
  132. 			result = "File Count";
  133. 			break;
  134. 		case 4:
  135. 			result = "Item Qty";
  136. 			break;
  137. 		case 5:
  138. 			result = "Product";
  139. 			break;
  140. 		case 6:
  141. 			result = "Notes";
  142. 			break;
  143. 		default:
  144. 			break;
  145. 		}
  146. 	} 
  147.  
  148. 	return result;
  149. }
  150.  
  151. Qt::ItemFlags FileCopyItemModel::flags(const QModelIndex &index) const 
  152. {
  153. 	Qt::ItemFlags result = Qt::ItemIsEditable | QAbstractItemModel::flags(index);
  154. 	return result;
  155. }
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Right now a pointer to the instance is being passed into the dialog with the QTableView. In the constructor this is being executed right now:

Qt Code: 
  1. ui.fileCopyTableView->setModel(_model);
  2. 	ui.fileCopyTableView->show();
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