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 ([email protected])
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6 | **
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7 | ** This file is part of the examples of the Qt Toolkit.
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8 | **
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9 | ** $QT_BEGIN_LICENSE:LGPL$
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10 | ** Commercial Usage
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11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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12 | ** accordance with the Qt Commercial License Agreement provided with the
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13 | ** Software or, alternatively, in accordance with the terms contained in
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14 | ** a written agreement between you and Nokia.
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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 | ** 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 have questions regarding the use of this file, please contact
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37 | ** Nokia at [email protected].
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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 | //! [1]
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44 | #include "googlesuggest.h"
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45 |
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46 | #define GSUGGEST_URL "http://google.com/complete/search?output=toolbar&q=%1"
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47 | //! [1]
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48 |
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49 | //! [2]
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50 | GSuggestCompletion::GSuggestCompletion(QLineEdit *parent): QObject(parent), editor(parent)
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51 | {
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52 | popup = new QTreeWidget;
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53 | popup->setWindowFlags(Qt::Popup);
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54 | popup->setFocusPolicy(Qt::NoFocus);
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55 | popup->setFocusProxy(parent);
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56 | popup->setMouseTracking(true);
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57 |
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58 | popup->setColumnCount(2);
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59 | popup->setUniformRowHeights(true);
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60 | popup->setRootIsDecorated(false);
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61 | popup->setEditTriggers(QTreeWidget::NoEditTriggers);
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62 | popup->setSelectionBehavior(QTreeWidget::SelectRows);
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63 | popup->setFrameStyle(QFrame::Box | QFrame::Plain);
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64 | popup->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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65 | popup->header()->hide();
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66 |
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67 | popup->installEventFilter(this);
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68 |
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69 | connect(popup, SIGNAL(itemClicked(QTreeWidgetItem*,int)),
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70 | SLOT(doneCompletion()));
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71 |
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72 | timer = new QTimer(this);
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73 | timer->setSingleShot(true);
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74 | timer->setInterval(500);
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75 | connect(timer, SIGNAL(timeout()), SLOT(autoSuggest()));
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76 | connect(editor, SIGNAL(textEdited(QString)), timer, SLOT(start()));
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77 |
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78 | connect(&networkManager, SIGNAL(finished(QNetworkReply*)),
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79 | this, SLOT(handleNetworkData(QNetworkReply*)));
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80 |
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81 | }
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82 | //! [2]
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83 |
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84 | //! [3]
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85 | GSuggestCompletion::~GSuggestCompletion()
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86 | {
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87 | delete popup;
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88 | }
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89 | //! [3]
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90 |
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91 | //! [4]
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92 | bool GSuggestCompletion::eventFilter(QObject *obj, QEvent *ev)
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93 | {
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94 | if (obj != popup)
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95 | return false;
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96 |
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97 | if (ev->type() == QEvent::MouseButtonPress) {
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98 | popup->hide();
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99 | editor->setFocus();
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100 | return true;
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101 | }
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102 |
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103 | if (ev->type() == QEvent::KeyPress) {
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104 |
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105 | bool consumed = false;
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106 | int key = static_cast<QKeyEvent*>(ev)->key();
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107 | switch (key) {
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108 | case Qt::Key_Enter:
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109 | case Qt::Key_Return:
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110 | doneCompletion();
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111 | consumed = true;
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112 |
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113 | case Qt::Key_Escape:
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114 | editor->setFocus();
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115 | popup->hide();
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116 | consumed = true;
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117 |
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118 | case Qt::Key_Up:
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119 | case Qt::Key_Down:
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120 | case Qt::Key_Home:
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121 | case Qt::Key_End:
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122 | case Qt::Key_PageUp:
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123 | case Qt::Key_PageDown:
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124 | break;
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125 |
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126 | default:
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127 | editor->setFocus();
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128 | editor->event(ev);
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129 | popup->hide();
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130 | break;
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131 | }
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132 |
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133 | return consumed;
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134 | }
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135 |
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136 | return false;
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137 | }
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138 | //! [4]
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139 |
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140 | //! [5]
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141 | void GSuggestCompletion::showCompletion(const QStringList &choices, const QStringList &hits)
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142 | {
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143 |
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144 | if (choices.isEmpty() || choices.count() != hits.count())
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145 | return;
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146 |
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147 | const QPalette &pal = editor->palette();
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148 | QColor color = pal.color(QPalette::Disabled, QPalette::WindowText);
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149 |
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150 | popup->setUpdatesEnabled(false);
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151 | popup->clear();
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152 | for (int i = 0; i < choices.count(); ++i) {
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153 | QTreeWidgetItem * item;
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154 | item = new QTreeWidgetItem(popup);
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155 | item->setText(0, choices[i]);
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156 | item->setText(1, hits[i]);
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157 | item->setTextAlignment(1, Qt::AlignRight);
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158 | item->setTextColor(1, color);
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159 | }
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160 | popup->setCurrentItem(popup->topLevelItem(0));
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161 | popup->resizeColumnToContents(0);
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162 | popup->resizeColumnToContents(1);
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163 | popup->adjustSize();
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164 | popup->setUpdatesEnabled(true);
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165 |
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166 | int h = popup->sizeHintForRow(0) * qMin(7, choices.count()) + 3;
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167 | popup->resize(popup->width(), h);
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168 |
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169 | popup->move(editor->mapToGlobal(QPoint(0, editor->height())));
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170 | popup->setFocus();
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171 | popup->show();
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172 | }
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173 | //! [5]
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174 |
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175 | //! [6]
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176 | void GSuggestCompletion::doneCompletion()
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177 | {
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178 | timer->stop();
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179 | popup->hide();
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180 | editor->setFocus();
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181 | QTreeWidgetItem *item = popup->currentItem();
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182 | if (item) {
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183 | editor->setText(item->text(0));
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184 | QMetaObject::invokeMethod(editor, "returnPressed");
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185 | }
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186 | }
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187 | //! [6]
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188 |
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189 | //! [7]
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190 | void GSuggestCompletion::autoSuggest()
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191 | {
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192 | QString str = editor->text();
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193 | QString url = QString(GSUGGEST_URL).arg(str);
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194 | networkManager.get(QNetworkRequest(QString(url)));
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195 | }
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196 | //! [7]
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197 |
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198 | //! [8]
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199 | void GSuggestCompletion::preventSuggest()
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200 | {
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201 | timer->stop();
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202 | }
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203 | //! [8]
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204 |
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205 | //! [9]
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206 | void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply)
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207 | {
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208 | QUrl url = networkReply->url();
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209 | if (!networkReply->error()) {
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210 | QStringList choices;
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211 | QStringList hits;
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212 |
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213 | QByteArray response(networkReply->readAll());
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214 | QXmlStreamReader xml(response);
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215 | while (!xml.atEnd()) {
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216 | xml.readNext();
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217 | if (xml.tokenType() == QXmlStreamReader::StartElement)
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218 | if (xml.name() == "suggestion") {
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219 | QStringRef str = xml.attributes().value("data");
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220 | choices << str.toString();
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221 | }
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222 | if (xml.tokenType() == QXmlStreamReader::StartElement)
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223 | if (xml.name() == "num_queries") {
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224 | QStringRef str = xml.attributes().value("int");
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225 | hits << str.toString();
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226 | }
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227 | }
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228 |
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229 | showCompletion(choices, hits);
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230 | }
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231 |
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232 | networkReply->deleteLater();
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233 | }
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234 | //! [9]
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