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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the documentation of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 /**************************************************************************** |
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43 ** |
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44 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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45 ** All rights reserved. |
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46 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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47 ** |
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48 ** This file is part of an example program for Qt. |
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49 ** EDITIONS: NOLIMITS |
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50 ** |
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51 ****************************************************************************/ |
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52 |
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53 /* |
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54 model.cpp |
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55 |
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56 A simple model that uses a QStringList as its data source. |
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57 */ |
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58 |
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59 #include "model.h" |
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60 |
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61 /*! |
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62 Returns the number of items in the string list as the number of rows |
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63 in the model. |
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64 */ |
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65 |
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66 int StringListModel::rowCount(const QModelIndex &parent) const |
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67 { |
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68 return stringList.count(); |
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69 } |
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70 |
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71 /*! |
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72 Returns an appropriate value for the requested data. |
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73 If the view requests an invalid index, an invalid variant is returned. |
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74 Any valid index that corresponds to a string in the list causes that |
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75 string to be returned. |
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76 */ |
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77 |
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78 QVariant StringListModel::data(const QModelIndex &index, int role) const |
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79 { |
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80 if (!index.isValid()) |
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81 return QVariant(); |
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82 |
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83 if (index.row() >= stringList.size()) |
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84 return QVariant(); |
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85 |
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86 if (role == Qt::DisplayRole) |
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87 return stringList.at(index.row()); |
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88 else |
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89 return QVariant(); |
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90 } |
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91 |
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92 /*! |
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93 Returns the appropriate header string depending on the orientation of |
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94 the header and the section. If anything other than the display role is |
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95 requested, we return an invalid variant. |
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96 */ |
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97 |
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98 QVariant StringListModel::headerData(int section, Qt::Orientation orientation, |
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99 int role) const |
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100 { |
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101 if (role != Qt::DisplayRole) |
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102 return QVariant(); |
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103 |
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104 if (orientation == Qt::Horizontal) |
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105 return QString("Column %1").arg(section); |
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106 else |
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107 return QString("Row %1").arg(section); |
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108 } |
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109 |
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110 /*! |
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111 Returns an appropriate value for the item's flags. Valid items are |
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112 enabled, selectable, and editable. |
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113 */ |
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114 |
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115 Qt::ItemFlags StringListModel::flags(const QModelIndex &index) const |
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116 { |
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117 if (!index.isValid()) |
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118 return Qt::ItemIsEnabled; |
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119 |
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120 return QAbstractItemModel::flags(index) | Qt::ItemIsEditable; |
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121 } |
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122 |
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123 /*! |
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124 Changes an item in the string list, but only if the following conditions |
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125 are met: |
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126 |
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127 * The index supplied is valid. |
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128 * The index corresponds to an item to be shown in a view. |
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129 * The role associated with editing text is specified. |
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130 |
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131 The dataChanged() signal is emitted if the item is changed. |
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132 */ |
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133 |
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134 bool StringListModel::setData(const QModelIndex &index, |
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135 const QVariant &value, int role) |
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136 { |
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137 if (index.isValid() && role == Qt::EditRole) { |
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138 |
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139 stringList.replace(index.row(), value.toString()); |
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140 emit dataChanged(index, index); |
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141 return true; |
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142 } |
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143 return false; |
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144 } |
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145 |
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146 /*! |
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147 Inserts a number of rows into the model at the specified position. |
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148 */ |
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149 |
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150 bool StringListModel::insertRows(int position, int rows, const QModelIndex &parent) |
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151 { |
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152 beginInsertRows(QModelIndex(), position, position+rows-1); |
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153 |
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154 for (int row = 0; row < rows; ++row) { |
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155 stringList.insert(position, ""); |
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156 } |
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157 |
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158 endInsertRows(); |
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159 return true; |
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160 } |
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161 |
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162 /*! |
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163 Removes a number of rows from the model at the specified position. |
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164 */ |
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165 |
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166 bool StringListModel::removeRows(int position, int rows, const QModelIndex &parent) |
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167 { |
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168 beginRemoveRows(QModelIndex(), position, position+rows-1); |
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169 |
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170 for (int row = 0; row < rows; ++row) { |
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171 stringList.removeAt(position); |
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172 } |
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173 |
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174 endRemoveRows(); |
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175 return true; |
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176 } |