/**************************************************************************** ** ** Copyright (C) 2010 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. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "textedit.h" #include #include #include #include #include #include #include #include //! [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) // dont 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]