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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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41
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42 import QtGui.QMenu
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43 import QtCore.QAbstractItemModel;
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44
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45 import modelmenu;
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46
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47 import QtCore.QAbstractItemModel;
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48 import qdebug;
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49
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50
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51
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52 // A QMenu that is dynamically populated from a QAbstractItemModel
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53 class ModelMenu : public QMenu
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54 {
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55 Q_OBJECT
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56
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57 signals:
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58 void activated(const QModelIndex &index);
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59 void hovered(const QString &text);
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60
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61 public:
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62 ModelMenu(QWidget *parent = null)
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63 {
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64 super(parent);
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65 m_maxRows = 7;
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66 m_firstSeparator = -1;
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67 m_maxWidth = -1;
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68 m_hoverRole = 0;
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69 m_separatorRole = 0;
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70 m_model = 0;
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71 connect(this, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
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72 }
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73
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74 void setModel(QAbstractItemModel *model)
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75 {
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76 m_model = model;
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77 }
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78
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79 QAbstractItemModel *model() const
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80 {
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81 return m_model;
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82 }
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83
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84 void setMaxRows(int max)
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85 {
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86 m_maxRows = max;
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87 }
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88
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89 int maxRows() const
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90 {
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91 return m_maxRows;
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92 }
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93
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94 void setFirstSeparator(int offset)
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95 {
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96 m_firstSeparator = offset;
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97 }
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98
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99 int firstSeparator() const
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100 {
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101 return m_firstSeparator;
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102 }
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103
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104 void setRootIndex(const QModelIndex &index)
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105 {
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106 m_root = index;
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107 }
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108 QModelIndex rootIndex() const
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109 {
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110 return m_root;
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111 }
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112
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113 void setHoverRole(int role)
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114 {
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115 m_hoverRole = role;
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116 }
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117 int hoverRole() const
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118 {
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119 return m_hoverRole;
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120 }
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121
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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() const
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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(const QIcon &icon, const QString &text, QObject *parent);
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133 {
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134 QFontMetrics fm(font());
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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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137 QString smallText = fm.elidedText(text, Qt.ElideMiddle, m_maxWidth);
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138 return new QAction(icon, smallText, parent);
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139 }
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140
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141 protected:
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142 // add any actions before the tree, return true if any actions are added.
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143 virtual bool prePopulated()
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144 {
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145 return false;
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146 }
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147 // add any actions after the tree
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148 virtual void postPopulated()
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149 {
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150 }
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151
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152 // put all of the children of parent into menu up to max
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153 void createMenu(const QModelIndex &parent, int max, QMenu *parentMenu = null, QMenu *menu = null)
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154 {
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155 if (!menu) {
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156 QString title = parent.data().toString();
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157 menu = new QMenu(title, this);
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158 QIcon icon = qvariant_cast<QIcon>(parent.data(Qt.DecorationRole));
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159 menu.setIcon(icon);
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160 parentMenu.addMenu(menu);
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161 QVariant v;
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162 v.setValue(parent);
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163 menu.menuAction().setData(v);
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164 connect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
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165 return;
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166 }
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167
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168 int end = m_model.rowCount(parent);
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169 if (max != -1)
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170 end = qMin(max, end);
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171
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172 connect(menu, SIGNAL(triggered(QAction*)), this, SLOT(triggered(QAction*)));
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173 connect(menu, SIGNAL(hovered(QAction*)), this, SLOT(hovered(QAction*)));
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174
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175 for (int i = 0; i < end; ++i) {
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176 QModelIndex idx = m_model.index(i, 0, parent);
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177 if (m_model.hasChildren(idx)) {
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178 createMenu(idx, -1, menu);
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179 } else {
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180 if (m_separatorRole != 0
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181 && idx.data(m_separatorRole).toBool())
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182 addSeparator();
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183 else
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184 menu.addAction(makeAction(idx));
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185 }
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186 if (menu == this && i == m_firstSeparator - 1)
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187 addSeparator();
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188 }
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189 }
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190
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191 private slots:
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192 Q_DECLARE_METATYPE(QModelIndex)
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193 void aboutToShow()
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194 {
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195 if (QMenu *menu = qobject_cast<QMenu*>(sender())) {
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196 QVariant v = menu.menuAction().data();
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197 if (v.canConvert<QModelIndex>()) {
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198 QModelIndex idx = qvariant_cast<QModelIndex>(v);
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199 createMenu(idx, -1, menu, menu);
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200 disconnect(menu, SIGNAL(aboutToShow()), this, SLOT(aboutToShow()));
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201 return;
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202 }
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203 }
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204
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205 clear();
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206 if (prePopulated())
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207 addSeparator();
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208 int max = m_maxRows;
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209 if (max != -1)
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210 max += m_firstSeparator;
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211 createMenu(m_root, max, this, this);
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212 postPopulated();
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213 }
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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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219 if (v.canConvert<QModelIndex>()) {
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220 QModelIndex idx = qvariant_cast<QModelIndex>(v);
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221 emit activated(idx);
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222 }
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223 }
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224
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225 void hovered(QAction *action)
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226 {
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227 QVariant v = action.data();
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228 if (v.canConvert<QModelIndex>()) {
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229 QModelIndex idx = qvariant_cast<QModelIndex>(v);
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230 QString hoveredString = idx.data(m_hoverRole).toString();
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231 if (!hoveredString.isEmpty())
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232 emit hovered(hoveredString);
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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 QAction *makeAction(const QModelIndex &index);
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238 {
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239 QIcon icon = qvariant_cast<QIcon>(index.data(Qt.DecorationRole));
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240 QAction *action = makeAction(icon, index.data().toString(), this);
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241 QVariant v;
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242 v.setValue(index);
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243 action.setData(v);
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244 return action;
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245 }
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246
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247 int m_maxRows;
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248 int m_firstSeparator;
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249 int m_maxWidth;
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250 int m_hoverRole;
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251 int m_separatorRole;
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252 QAbstractItemModel *m_model;
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253 QPersistentModelIndex m_root;
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254 }
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