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1 /****************************************************************************
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2 **
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 ** Contact: Qt Software Information (qt-info@nokia.com)
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5 **
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6 ** This file is part of the demonstration applications of the Qt Toolkit.
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7 **
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8 ** $QT_BEGIN_LICENSE:LGPL$
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9 ** Commercial Usage
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10 ** Licensees holding valid Qt Commercial licenses may use this file in
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11 ** accordance with the Qt Commercial License Agreement provided with the
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12 ** Software or, alternatively, in accordance with the terms contained in
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13 ** a written agreement between you and Nokia.
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14 **
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15 ** GNU Lesser General Public License Usage
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16 ** Alternatively, this file may be used under the terms of the GNU Lesser
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17 ** General Public License version 2.1 as published by the Free Software
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18 ** Foundation and appearing in the file LICENSE.LGPL included in the
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19 ** packaging of this file. Please review the following information to
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20 ** ensure the GNU Lesser General Public License version 2.1 requirements
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21 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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22 **
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23 ** In addition, as a special exception, Nokia gives you certain
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24 ** additional rights. These rights are described in the Nokia Qt LGPL
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25 ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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26 ** package.
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27 **
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28 ** GNU General Public License Usage
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29 ** Alternatively, this file may be used under the terms of the GNU
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30 ** General Public License version 3.0 as published by the Free Software
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31 ** Foundation and appearing in the file LICENSE.GPL included in the
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32 ** packaging of this file. Please review the following information to
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33 ** ensure the GNU General Public License version 3.0 requirements will be
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34 ** met: http://www.gnu.org/copyleft/gpl.html.
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35 **
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36 ** If you are unsure which license is appropriate for your use, please
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37 ** contact the sales department at qt-sales@nokia.com.
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38 ** $QT_END_LICENSE$
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39 **
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40 ****************************************************************************/
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73
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41 module modelmenu;
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45
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42
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43
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77
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44 import qt.gui.QMenu;
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73
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45 import qt.core.QAbstractItemModel;
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45
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46
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94
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47 import qt.core.QPersistentModelIndex;
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48 //import qdebug;
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45
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49
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50
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51 // A QMenu that is dynamically populated from a QAbstractItemModel
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52 class ModelMenu : public QMenu
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53 {
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77
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54
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74
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55 mixin Signal!("activated", QModelIndex /*index*/);
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94
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56 mixin Signal!("linkHovered", string /*text*/);
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45
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57
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58 public:
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59
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73
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60 this(QWidget parent = null)
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61 {
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62 super(parent);
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63 m_maxRows = 7;
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64 m_firstSeparator = -1;
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65 m_maxWidth = -1;
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66 m_hoverRole = 0;
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67 m_separatorRole = 0;
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68 m_model = 0;
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69 this.aboutToShow.connect(&this.aboutToShow);
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70 }
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71
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72 void setModel(QAbstractItemModel model)
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73 {
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74 m_model = model;
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75 }
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45
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76
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73
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77 QAbstractItemModel model()
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78 {
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79 return m_model;
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80 }
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45
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81
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73
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82 void setMaxRows(int max)
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83 {
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84 m_maxRows = max;
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85 }
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45
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86
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73
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87 int maxRows()
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88 {
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89 return m_maxRows;
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90 }
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45
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91
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73
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92 void setFirstSeparator(int offset)
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93 {
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94 m_firstSeparator = offset;
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95 }
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45
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96
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97 int firstSeparator()
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98 {
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99 return m_firstSeparator;
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100 }
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45
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101
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73
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102 void setRootIndex(QModelIndex index)
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103 {
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104 m_root = index;
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105 }
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106
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107 QModelIndex rootIndex()
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108 {
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109 return m_root;
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110 }
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45
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111
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73
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112 void setHoverRole(int role)
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113 {
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114 m_hoverRole = role;
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115 }
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116
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117 int hoverRole()
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118 {
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119 return m_hoverRole;
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120 }
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45
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121
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73
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122 void setSeparatorRole(int role)
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123 {
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124 m_separatorRole = role;
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125 }
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126
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127 int separatorRole()
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128 {
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129 return m_separatorRole;
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130 }
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131
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132 QAction makeAction(QIcon icon, string text, QObject parent)
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73
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133 {
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74
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134 auto fm = new QFontMetrics(font());
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73
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135 if (-1 == m_maxWidth)
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136 m_maxWidth = fm.width(QLatin1Char('m')) * 30;
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77
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137 string smallText = fm.elidedText(text, Qt.ElideMiddle, m_maxWidth);
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73
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138 return new QAction(icon, smallText, parent);
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139 }
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45
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140
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141 protected:
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142
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73
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143 // add any actions before the tree, return true if any actions are added.
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144 bool prePopulated()
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145 {
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146 return false;
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147 }
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148
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149 // add any actions after the tree
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150 void postPopulated()
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151 {
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152 }
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45
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153
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73
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154 // put all of the children of parent into menu up to max
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155 void createMenu(QModelIndex parent, int max, QMenu parentMenu = null, QMenu menu = null)
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156 {
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157 if (!menu) {
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77
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158 string title = parent.data().toString();
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73
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159 menu = new QMenu(title, this);
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160 QIcon icon = cast(QIcon) parent.data(Qt.DecorationRole);
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161 menu.setIcon(icon);
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162 parentMenu.addMenu(menu);
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163 auto v = new QVariant;
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164 v.setValue(parent);
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165 menu.menuAction().setData(v);
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94
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166 menu.aboutToShow.connect(&this.aboutToShow);
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167 return;
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168 }
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45
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169
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73
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170 int end = m_model.rowCount(parent);
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171 if (max != -1)
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172 end = qMin(max, end);
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45
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173
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73
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174 menu.triggered.connect(&this.triggered);
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94
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175 menu.linkHovered.connect(&this.linkHovered);
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45
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176
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177 for (int i = 0; i < end; ++i) {
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178 QModelIndex idx = m_model.index(i, 0, parent);
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179 if (m_model.hasChildren(idx)) {
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180 createMenu(idx, -1, menu);
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181 } else {
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182 if (m_separatorRole != 0 && idx.data(m_separatorRole).toBool())
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183 addSeparator();
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184 else
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185 menu.addAction(makeAction(idx));
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186 }
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187 if (menu == this && i == m_firstSeparator - 1)
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188 addSeparator();
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189 }
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190 }
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45
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191
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192 private:
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73
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193
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194 void aboutToShow()
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195 {
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77
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196 if (QMenu menu = cast(QMenu) signalSender()) {
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73
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197 QVariant v = menu.menuAction().data();
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77
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198 if (v.canConvert!(QModelIndex)()) {
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199 QModelIndex idx = cast(QModelIndex) v;
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73
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200 createMenu(idx, -1, menu, menu);
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201 menu.aboutToShow.disconnect(&this.aboutToShow);
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202 return;
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203 }
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204 }
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205
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206 clear();
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207 if (prePopulated())
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208 addSeparator();
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209 int max = m_maxRows;
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210 if (max != -1)
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211 max += m_firstSeparator;
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212 createMenu(m_root, max, this, this);
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213 postPopulated();
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214 }
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215
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216 void triggered(QAction action)
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217 {
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218 QVariant v = action.data();
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77
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219 if (v.canConvert!(QModelIndex)()) {
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220 QModelIndex idx = cast(QModelIndex) v;
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221 activated.emit(idx);
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73
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222 }
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223 }
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224
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94
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225 void linkHovered(QAction action)
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73
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226 {
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227 QVariant v = action.data();
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77
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228 if (v.canConvert!(QModelIndex)()) {
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229 QModelIndex idx = cast(QModelIndex) v;
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230 string hoveredString = idx.data(m_hoverRole).toString();
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73
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231 if (!hoveredString.isEmpty())
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232 linkHovered.emit(hoveredString);
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73
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233 }
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234 }
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235
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236 private:
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237
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74
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238 QAction makeAction(QModelIndex index)
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73
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239 {
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74
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240 QIcon icon = cast(QIcon) index.data(Qt.DecorationRole);
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73
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241 QAction action = makeAction(icon, index.data().toString(), this);
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94
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242 auto v = new QVariant;
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73
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243 v.setValue(index);
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244 action.setData(v);
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245 return action;
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246 }
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247
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248 int m_maxRows;
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249 int m_firstSeparator;
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250 int m_maxWidth;
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251 int m_hoverRole;
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252 int m_separatorRole;
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253 QAbstractItemModel m_model;
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254 QPersistentModelIndex m_root;
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45
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255 }
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