wowlet/src/utils/textedit.cpp

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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
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** as follows:
**
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** modification, are permitted provided that the following conditions are
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** * Redistributions of source code must retain the above copyright
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#include "textedit.h"
#include <QCompleter>
#include <QKeyEvent>
#include <QAbstractItemView>
#include <QtDebug>
#include <QApplication>
#include <QModelIndex>
#include <QAbstractItemModel>
#include <QScrollBar>
TextEdit::TextEdit(QWidget *parent) : QTextEdit(parent) { }
TextEdit::~TextEdit() { }
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);
}
QCompleter *TextEdit::completer() const {
return c;
}
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);
}
QString TextEdit::textUnderCursor() const {
QTextCursor tc = textCursor();
tc.select(QTextCursor::WordUnderCursor);
return tc.selectedText();
}
void TextEdit::focusInEvent(QFocusEvent *e) {
if (c)
c->setWidget(this);
QTextEdit::focusInEvent(e);
}
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);
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!
}
QAbstractItemModel *TextEdit::modelFromFile(const QString& fileName, QCompleter *completer) {
QFile file(fileName);
if (!file.open(QFile::ReadOnly))
return new QStringListModel(completer);
QStringList words;
while (!file.atEnd()) {
QByteArray line = file.readLine();
if (!line.isEmpty())
words << QString::fromUtf8(line.trimmed());
}
return new QStringListModel(words, completer);
}