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Diffstat (limited to 'examples/tools/customcompleter/textedit.cpp')
| -rw-r--r-- | examples/tools/customcompleter/textedit.cpp | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/examples/tools/customcompleter/textedit.cpp b/examples/tools/customcompleter/textedit.cpp new file mode 100644 index 0000000..ecafa8f --- /dev/null +++ b/examples/tools/customcompleter/textedit.cpp @@ -0,0 +1,174 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (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 either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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(const QString&)), + this, SLOT(insertCompletion(const 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] + |