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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #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)
++ {
++ 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)
++ c->disconnect(this);
++
++ c = completer;
++
++ if (!c)
++ return;
++
++ c->setWidget(this);
++ c->setCompletionMode(QCompleter::PopupCompletion);
++ c->setCaseSensitivity(Qt::CaseInsensitive);
++ QObject::connect(c, QOverload<const QString &>::of(&QCompleter::activated),
++ this, &TextEdit::insertCompletion);
++ }
++ //! [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;
++ }
++ }
++
++ const bool isShortcut = (e->modifiers().testFlag(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().testFlag(Qt::ControlModifier) ||
++ e->modifiers().testFlag(Qt::ShiftModifier);
++ if (!c || (ctrlOrShift && e->text().isEmpty()))
++ return;
++
++ static QString eow("~!@#$%^&*()_+{}|:\"<>?,./;'[]\\-="); // end of word
++ const 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]
++