Add Text Editor example

A follow up commit will contain the touch UI.

Change-Id: I26275fdd31294506821fa3e3e4a4bb63329665b9
Task-number: QTBUG-54952
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

1 files changed, 381 insertions, 0 deletions

diff --git a/examples/quickcontrols2/texteditor/documenthandler.cpp b/examples/quickcontrols2/texteditor/documenthandler.cpp
new file mode 100644
index 00000000..2a13b211
--- /dev/null
+++ b/examples/quickcontrols2/texteditor/documenthandler.cpp
@@ -0,0 +1,381 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, 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 The Qt Company Ltd 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 "documenthandler.h"
+
+#include <QFileInfo>
+#include <QFontDatabase>
+#include <QQmlFile>
+#include <QQuickTextDocument>
+#include <QTextCharFormat>
+#include <QTextCodec>
+#include <QTextCursor>
+#include <QTextDocument>
+
+DocumentHandler::DocumentHandler(QObject *parent)
+    : QObject(parent)
+    , m_doc(nullptr)
+    , m_cursorPosition(-1)
+    , m_selectionStart(0)
+    , m_selectionEnd(0)
+{
+}
+
+QQuickTextDocument *DocumentHandler::document() const
+{
+    return m_quickDoc;
+}
+
+void DocumentHandler::setDocument(QQuickTextDocument *quickDoc)
+{
+    if (quickDoc == m_quickDoc)
+        return;
+
+    m_quickDoc = quickDoc;
+    m_doc = nullptr;
+
+    if (quickDoc)
+        m_doc = quickDoc->textDocument();
+
+    emit documentChanged();
+}
+
+void DocumentHandler::setFileUrl(const QUrl &fileUrl)
+{
+    if (fileUrl == m_fileUrl)
+        return;
+
+    m_fileUrl = fileUrl;
+    QString fileName = QQmlFile::urlToLocalFileOrQrc(fileUrl);
+    if (QFile::exists(fileName)) {
+        QFile file(fileName);
+        if (file.open(QFile::ReadOnly)) {
+            QByteArray data = file.readAll();
+            QTextCodec *codec = QTextCodec::codecForHtml(data);
+            setText(codec->toUnicode(data));
+            if (m_doc)
+                m_doc->setModified(false);
+            if (fileName.isEmpty())
+                m_documentTitle = QStringLiteral("untitled.txt");
+            else
+                m_documentTitle = QFileInfo(fileName).fileName();
+
+            emit textChanged();
+            emit documentTitleChanged();
+
+            reset();
+        }
+    }
+    emit fileUrlChanged();
+}
+
+QString DocumentHandler::documentTitle() const
+{
+    return m_documentTitle;
+}
+
+void DocumentHandler::setDocumentTitle(const QString &documentTitle)
+{
+    if (documentTitle == m_documentTitle)
+        return;
+
+    m_documentTitle = documentTitle;
+    emit documentTitleChanged();
+}
+
+void DocumentHandler::setText(const QString &text)
+{
+    if (text == m_text)
+        return;
+
+    m_text = text;
+    emit textChanged();
+}
+
+void DocumentHandler::saveAs(const QUrl &fileUrl, const QString &fileType)
+{
+    if (!m_doc)
+        return;
+
+    // TODO: remove this when FileDialog gets suffix property
+    QString localPath = fileUrl.toLocalFile();
+    QString extension = fileType;
+    if (extension.isEmpty()) {
+        if (QFile::exists(localPath)) {
+            extension = QFileInfo(localPath).suffix();
+        } else {
+            const int periodIndex = localPath.indexOf(QLatin1Char('.'));
+            if (periodIndex != -1)
+                extension = localPath.mid(periodIndex);
+        }
+    }
+
+    const bool isHtml = extension.contains(QLatin1String("htm"));
+    if (!localPath.endsWith(extension))
+        localPath += extension;
+    QFile f(localPath);
+    if (!f.open(QFile::WriteOnly | QFile::Truncate | (isHtml ? QFile::NotOpen : QFile::Text))) {
+        emit error(tr("Cannot save: ") + f.errorString());
+        return;
+    }
+    f.write((isHtml ? m_doc->toHtml() : m_doc->toPlainText()).toLocal8Bit());
+    f.close();
+    setFileUrl(QUrl::fromLocalFile(localPath));
+}
+
+QUrl DocumentHandler::fileUrl() const
+{
+    return m_fileUrl;
+}
+
+QString DocumentHandler::text() const
+{
+    return m_text;
+}
+
+void DocumentHandler::setCursorPosition(int position)
+{
+    if (position == m_cursorPosition)
+        return;
+
+    m_cursorPosition = position;
+
+    reset();
+}
+
+void DocumentHandler::reset()
+{
+    emit fontFamilyChanged();
+    emit alignmentChanged();
+    emit boldChanged();
+    emit italicChanged();
+    emit underlineChanged();
+    emit fontSizeChanged();
+    emit textColorChanged();
+}
+
+QTextCursor DocumentHandler::textCursor() const
+{
+    if (!m_doc)
+        return QTextCursor();
+
+    QTextCursor cursor = QTextCursor(m_doc);
+    if (m_selectionStart != m_selectionEnd) {
+        cursor.setPosition(m_selectionStart);
+        cursor.setPosition(m_selectionEnd, QTextCursor::KeepAnchor);
+    } else {
+        cursor.setPosition(m_cursorPosition);
+    }
+    return cursor;
+}
+
+void DocumentHandler::mergeFormatOnWordOrSelection(const QTextCharFormat &format)
+{
+    QTextCursor cursor = textCursor();
+    if (!cursor.hasSelection())
+        cursor.select(QTextCursor::WordUnderCursor);
+    cursor.mergeCharFormat(format);
+}
+
+void DocumentHandler::setSelectionStart(int position)
+{
+    if (position == m_selectionStart)
+        return;
+
+    m_selectionStart = position;
+    emit selectionStartChanged();
+}
+
+void DocumentHandler::setSelectionEnd(int position)
+{
+    if (position == m_selectionEnd)
+        return;
+
+    m_selectionEnd = position;
+    emit selectionEndChanged();
+}
+
+void DocumentHandler::setAlignment(Qt::Alignment alignment)
+{
+    if (!m_doc)
+        return;
+
+    QTextBlockFormat format;
+    format.setAlignment(alignment);
+    QTextCursor cursor = textCursor();
+    cursor.mergeBlockFormat(format);
+    emit alignmentChanged();
+}
+
+Qt::Alignment DocumentHandler::alignment() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return Qt::AlignLeft;
+    return textCursor().blockFormat().alignment();
+}
+
+bool DocumentHandler::bold() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return false;
+    return textCursor().charFormat().fontWeight() == QFont::Bold;
+}
+
+bool DocumentHandler::italic() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return false;
+    return textCursor().charFormat().fontItalic();
+}
+
+bool DocumentHandler::underline() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return false;
+    return textCursor().charFormat().fontUnderline();
+}
+
+void DocumentHandler::setBold(bool bold)
+{
+    QTextCharFormat format;
+    format.setFontWeight(bold ? QFont::Bold : QFont::Normal);
+    mergeFormatOnWordOrSelection(format);
+    emit boldChanged();
+}
+
+void DocumentHandler::setItalic(bool italic)
+{
+    QTextCharFormat format;
+    format.setFontItalic(italic);
+    mergeFormatOnWordOrSelection(format);
+    emit italicChanged();
+}
+
+void DocumentHandler::setUnderline(bool underline)
+{
+    QTextCharFormat format;
+    format.setFontUnderline(underline);
+    mergeFormatOnWordOrSelection(format);
+    emit underlineChanged();
+}
+
+int DocumentHandler::fontSize() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return 0;
+    QTextCharFormat format = cursor.charFormat();
+    return format.font().pointSize();
+}
+
+void DocumentHandler::setFontSize(int fontSize)
+{
+    if (fontSize <= 0)
+        return;
+
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return;
+
+    if (!cursor.hasSelection())
+        cursor.select(QTextCursor::WordUnderCursor);
+
+    if (cursor.charFormat().property(QTextFormat::FontPointSize).toInt() == fontSize)
+        return;
+
+    QTextCharFormat format;
+    format.setFontPointSize(fontSize);
+    mergeFormatOnWordOrSelection(format);
+    emit fontSizeChanged();
+}
+
+QColor DocumentHandler::textColor() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return QColor(Qt::black);
+    QTextCharFormat format = cursor.charFormat();
+    return format.foreground().color();
+}
+
+void DocumentHandler::setTextColor(const QColor &color)
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return;
+    QTextCharFormat format;
+    format.setForeground(QBrush(color));
+    mergeFormatOnWordOrSelection(format);
+    emit textColorChanged();
+}
+
+QString DocumentHandler::fontFamily() const
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return QString();
+    QTextCharFormat format = cursor.charFormat();
+    return format.font().family();
+}
+
+void DocumentHandler::setFontFamily(const QString &fontFamily)
+{
+    QTextCursor cursor = textCursor();
+    if (cursor.isNull())
+        return;
+    QTextCharFormat format;
+    format.setFontFamily(fontFamily);
+    mergeFormatOnWordOrSelection(format);
+    emit fontFamilyChanged();
+}