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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "textedit.h"
+#include <QCompleter>
+#include <QKeyEvent>
+#include <QAbstractItemView>
+#include <QtDebug>
+#include <QApplication>
+#include <QModelIndex>
+#include <QAbstractItemModel>
+#include <QScrollBar>
+
+//! [0]
+TextEdit::TextEdit(QWidget *parent)
+: QTextEdit(parent), c(0)
+{
+ setPlainText(tr("This TextEdit provides autocompletions for words that have more than"
+ " 3 characters. You can trigger autocompletion using ") +
+ QKeySequence("Ctrl+E").toString(QKeySequence::NativeText));
+}
+//! [0]
+
+//! [1]
+TextEdit::~TextEdit()
+{
+}
+//! [1]
+
+//! [2]
+void TextEdit::setCompleter(QCompleter *completer)
+{
+ if (c)
+ QObject::disconnect(c, 0, this, 0);
+
+ c = completer;
+
+ if (!c)
+ return;
+
+ c->setWidget(this);
+ c->setCompletionMode(QCompleter::PopupCompletion);
+ c->setCaseSensitivity(Qt::CaseInsensitive);
+ QObject::connect(c, SIGNAL(activated(QString)),
+ this, SLOT(insertCompletion(QString)));
+}
+//! [2]
+
+//! [3]
+QCompleter *TextEdit::completer() const
+{
+ return c;
+}
+//! [3]
+
+//! [4]
+void TextEdit::insertCompletion(const QString& completion)
+{
+ if (c->widget() != this)
+ return;
+ QTextCursor tc = textCursor();
+ int extra = completion.length() - c->completionPrefix().length();
+ tc.movePosition(QTextCursor::Left);
+ tc.movePosition(QTextCursor::EndOfWord);
+ tc.insertText(completion.right(extra));
+ setTextCursor(tc);
+}
+//! [4]
+
+//! [5]
+QString TextEdit::textUnderCursor() const
+{
+ QTextCursor tc = textCursor();
+ tc.select(QTextCursor::WordUnderCursor);
+ return tc.selectedText();
+}
+//! [5]
+
+//! [6]
+void TextEdit::focusInEvent(QFocusEvent *e)
+{
+ if (c)
+ c->setWidget(this);
+ QTextEdit::focusInEvent(e);
+}
+//! [6]
+
+//! [7]
+void TextEdit::keyPressEvent(QKeyEvent *e)
+{
+ if (c && c->popup()->isVisible()) {
+ // The following keys are forwarded by the completer to the widget
+ switch (e->key()) {
+ case Qt::Key_Enter:
+ case Qt::Key_Return:
+ case Qt::Key_Escape:
+ case Qt::Key_Tab:
+ case Qt::Key_Backtab:
+ e->ignore();
+ return; // let the completer do default behavior
+ default:
+ break;
+ }
+ }
+
+ bool isShortcut = ((e->modifiers() & Qt::ControlModifier) && e->key() == Qt::Key_E); // CTRL+E
+ if (!c || !isShortcut) // do not process the shortcut when we have a completer
+ QTextEdit::keyPressEvent(e);
+//! [7]
+
+//! [8]
+ const bool ctrlOrShift = e->modifiers() & (Qt::ControlModifier | Qt::ShiftModifier);
+ if (!c || (ctrlOrShift && e->text().isEmpty()))
+ return;
+
+ static QString eow("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="); // end of word
+ bool hasModifier = (e->modifiers() != Qt::NoModifier) && !ctrlOrShift;
+ QString completionPrefix = textUnderCursor();
+
+ if (!isShortcut && (hasModifier || e->text().isEmpty()|| completionPrefix.length() < 3
+ || eow.contains(e->text().right(1)))) {
+ c->popup()->hide();
+ return;
+ }
+
+ if (completionPrefix != c->completionPrefix()) {
+ c->setCompletionPrefix(completionPrefix);
+ c->popup()->setCurrentIndex(c->completionModel()->index(0, 0));
+ }
+ QRect cr = cursorRect();
+ cr.setWidth(c->popup()->sizeHintForColumn(0)
+ + c->popup()->verticalScrollBar()->sizeHint().width());
+ c->complete(cr); // popup it up!
+}
+//! [8]
+