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