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50
51#include "mainwindow.h"
52#include "treemodelcompleter.h"
53
54#include <QAbstractProxyModel>
55#include <QAction>
56#include <QApplication>
57#include <QCheckBox>
58#include <QComboBox>
59#include <QFile>
60#include <QGridLayout>
61#include <QHeaderView>
62#include <QLabel>
63#include <QLineEdit>
64#include <QMenuBar>
65#include <QMessageBox>
66#include <QStandardItemModel>
67#include <QStringListModel>
68#include <QTreeView>
69
70//! [0]
71MainWindow::MainWindow(QWidget *parent)
72 : QMainWindow(parent)
73{
74 createMenu();
75
76 completer = new TreeModelCompleter(this);
77 completer->setModel(modelFromFile(fileName: ":/resources/treemodel.txt"));
78 completer->setSeparator(QLatin1String("."));
79 QObject::connect(sender: completer, signal: QOverload<const QModelIndex &>::of(ptr: &TreeModelCompleter::highlighted),
80 receiver: this, slot: &MainWindow::highlight);
81
82 QWidget *centralWidget = new QWidget;
83
84 QLabel *modelLabel = new QLabel;
85 modelLabel->setText(tr(s: "Tree Model<br>(Double click items to edit)"));
86
87 QLabel *modeLabel = new QLabel;
88 modeLabel->setText(tr(s: "Completion Mode"));
89 modeCombo = new QComboBox;
90 modeCombo->addItem(atext: tr(s: "Inline"));
91 modeCombo->addItem(atext: tr(s: "Filtered Popup"));
92 modeCombo->addItem(atext: tr(s: "Unfiltered Popup"));
93 modeCombo->setCurrentIndex(1);
94
95 QLabel *caseLabel = new QLabel;
96 caseLabel->setText(tr(s: "Case Sensitivity"));
97 caseCombo = new QComboBox;
98 caseCombo->addItem(atext: tr(s: "Case Insensitive"));
99 caseCombo->addItem(atext: tr(s: "Case Sensitive"));
100 caseCombo->setCurrentIndex(0);
101//! [0]
102
103//! [1]
104 QLabel *separatorLabel = new QLabel;
105 separatorLabel->setText(tr(s: "Tree Separator"));
106
107 QLineEdit *separatorLineEdit = new QLineEdit;
108 separatorLineEdit->setText(completer->separator());
109 connect(sender: separatorLineEdit, signal: &QLineEdit::textChanged,
110 receiver: completer, slot: &TreeModelCompleter::setSeparator);
111
112 QCheckBox *wrapCheckBox = new QCheckBox;
113 wrapCheckBox->setText(tr(s: "Wrap around completions"));
114 wrapCheckBox->setChecked(completer->wrapAround());
115 connect(sender: wrapCheckBox, signal: &QAbstractButton::clicked, receiver: completer, slot: &QCompleter::setWrapAround);
116
117 contentsLabel = new QLabel;
118 contentsLabel->setSizePolicy(hor: QSizePolicy::Fixed, ver: QSizePolicy::Fixed);
119 connect(sender: separatorLineEdit, signal: &QLineEdit::textChanged,
120 receiver: this, slot: &MainWindow::updateContentsLabel);
121
122 treeView = new QTreeView;
123 treeView->setModel(completer->model());
124 treeView->header()->hide();
125 treeView->expandAll();
126//! [1]
127
128//! [2]
129 connect(sender: modeCombo, signal: QOverload<int>::of(ptr: &QComboBox::activated),
130 receiver: this, slot: &MainWindow::changeMode);
131 connect(sender: caseCombo, signal: QOverload<int>::of(ptr: &QComboBox::activated),
132 receiver: this, slot: &MainWindow::changeMode);
133
134 lineEdit = new QLineEdit;
135 lineEdit->setCompleter(completer);
136//! [2]
137
138//! [3]
139 QGridLayout *layout = new QGridLayout;
140 layout->addWidget(modelLabel, row: 0, column: 0); layout->addWidget(treeView, row: 0, column: 1);
141 layout->addWidget(modeLabel, row: 1, column: 0); layout->addWidget(modeCombo, row: 1, column: 1);
142 layout->addWidget(caseLabel, row: 2, column: 0); layout->addWidget(caseCombo, row: 2, column: 1);
143 layout->addWidget(separatorLabel, row: 3, column: 0); layout->addWidget(separatorLineEdit, row: 3, column: 1);
144 layout->addWidget(wrapCheckBox, row: 4, column: 0);
145 layout->addWidget(contentsLabel, row: 5, column: 0, rowSpan: 1, columnSpan: 2);
146 layout->addWidget(lineEdit, row: 6, column: 0, rowSpan: 1, columnSpan: 2);
147 centralWidget->setLayout(layout);
148 setCentralWidget(centralWidget);
149
150 changeCase(caseCombo->currentIndex());
151 changeMode(modeCombo->currentIndex());
152
153 setWindowTitle(tr(s: "Tree Model Completer"));
154 lineEdit->setFocus();
155}
156//! [3]
157
158//! [4]
159void MainWindow::createMenu()
160{
161 QAction *exitAction = new QAction(tr(s: "Exit"), this);
162 QAction *aboutAct = new QAction(tr(s: "About"), this);
163 QAction *aboutQtAct = new QAction(tr(s: "About Qt"), this);
164
165 connect(sender: exitAction, signal: &QAction::triggered, qApp, slot: &QApplication::quit);
166 connect(sender: aboutAct, signal: &QAction::triggered, receiver: this, slot: &MainWindow::about);
167 connect(sender: aboutQtAct, signal: &QAction::triggered, qApp, slot: &QApplication::aboutQt);
168
169 QMenu *fileMenu = menuBar()->addMenu(title: tr(s: "File"));
170 fileMenu->addAction(action: exitAction);
171
172 QMenu *helpMenu = menuBar()->addMenu(title: tr(s: "About"));
173 helpMenu->addAction(action: aboutAct);
174 helpMenu->addAction(action: aboutQtAct);
175}
176//! [4]
177
178//! [5]
179void MainWindow::changeMode(int index)
180{
181 QCompleter::CompletionMode mode;
182 if (index == 0)
183 mode = QCompleter::InlineCompletion;
184 else if (index == 1)
185 mode = QCompleter::PopupCompletion;
186 else
187 mode = QCompleter::UnfilteredPopupCompletion;
188
189 completer->setCompletionMode(mode);
190}
191//! [5]
192
193QAbstractItemModel *MainWindow::modelFromFile(const QString &fileName)
194{
195 QFile file(fileName);
196 if (!file.open(flags: QFile::ReadOnly))
197 return new QStringListModel(completer);
198
199#ifndef QT_NO_CURSOR
200 QGuiApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
201#endif
202
203 QStandardItemModel *model = new QStandardItemModel(completer);
204 QVector<QStandardItem *> parents(10);
205 parents[0] = model->invisibleRootItem();
206
207 QRegularExpression re("^\\s+");
208 while (!file.atEnd()) {
209 const QString line = QString::fromUtf8(str: file.readLine());
210 const QString trimmedLine = line.trimmed();
211 if (trimmedLine.isEmpty())
212 continue;
213
214 const QRegularExpressionMatch match = re.match(subject: line);
215 int nonws = match.capturedStart();
216 int level = 0;
217 if (nonws == -1) {
218 level = 0;
219 } else {
220 const int capLen = match.capturedLength();
221 level = capLen / 4;
222 }
223
224 if (level + 1 >= parents.size())
225 parents.resize(asize: parents.size() * 2);
226
227 QStandardItem *item = new QStandardItem;
228 item->setText(trimmedLine);
229 parents[level]->appendRow(aitem: item);
230 parents[level + 1] = item;
231 }
232
233#ifndef QT_NO_CURSOR
234 QGuiApplication::restoreOverrideCursor();
235#endif
236
237 return model;
238}
239
240void MainWindow::highlight(const QModelIndex &index)
241{
242 QAbstractItemModel *completionModel = completer->completionModel();
243 QAbstractProxyModel *proxy = qobject_cast<QAbstractProxyModel *>(object: completionModel);
244 if (!proxy)
245 return;
246 QModelIndex sourceIndex = proxy->mapToSource(proxyIndex: index);
247 treeView->selectionModel()->select(index: sourceIndex, command: QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);
248 treeView->scrollTo(index: sourceIndex);
249}
250
251//! [6]
252void MainWindow::about()
253{
254 QMessageBox::about(parent: this, title: tr(s: "About"), text: tr(s: "This example demonstrates how "
255 "to use a QCompleter with a custom tree model."));
256}
257//! [6]
258
259//! [7]
260void MainWindow::changeCase(int cs)
261{
262 completer->setCaseSensitivity(cs ? Qt::CaseSensitive : Qt::CaseInsensitive);
263}
264//! [7]
265
266void MainWindow::updateContentsLabel(const QString &sep)
267{
268 contentsLabel->setText(tr(s: "Type path from model above with items at each level separated by a '%1'").arg(a: sep));
269}
270

source code of qtbase/examples/widgets/tools/treemodelcompleter/mainwindow.cpp