qquicktextedit.cpp

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#include "qquicktextedit_p.h"
#include "qquicktextedit_p_p.h"
#include "qquicktextcontrol_p.h"
#include "qquicktext_p_p.h"
#include "qquickevents_p_p.h"
#include "qquickwindow.h"
#include "qquicktextnode_p.h"
#include "qquicktextnodeengine_p.h"
#include "qquicktextutil_p.h"
#include <QtQuick/qsgsimplerectnode.h>

#include <QtQml/qqmlinfo.h>
#include <QtGui/qguiapplication.h>
#include <QtGui/qevent.h>
#include <QtGui/qpainter.h>
#include <QtGui/qtextobject.h>
#include <QtGui/qtexttable.h>
#include <QtCore/qmath.h>

#include <private/qqmlglobal_p.h>
#include <private/qqmlproperty_p.h>
#include <private/qtextengine_p.h>
#include <private/qsgadaptationlayer_p.h>

#include "qquicktextdocument.h"

#include <algorithm>

QT_BEGIN_NAMESPACE

/*!
    \qmltype TextEdit
    \instantiates QQuickTextEdit
    \inqmlmodule QtQuick
    \ingroup qtquick-visual
    \ingroup qtquick-input
    \inherits Item
    \brief Displays multiple lines of editable formatted text

    The TextEdit item displays a block of editable, formatted text.

    It can display both plain and rich text. For example:

    \qml
TextEdit {
    width: 240
    text: "<b>Hello</b> <i>World!</i>"
    font.family: "Helvetica"
    font.pointSize: 20
    color: "blue"
    focus: true
}
    \endqml

    \image declarative-textedit.gif

    Setting \l {Item::focus}{focus} to \c true enables the TextEdit item to receive keyboard focus.

    Note that the TextEdit does not implement scrolling, following the cursor, or other behaviors specific
    to a look-and-feel. For example, to add flickable scrolling that follows the cursor:

    \snippet qml/texteditor.qml 0

    A particular look-and-feel might use smooth scrolling (eg. using SmoothedAnimation), might have a visible
    scrollbar, or a scrollbar that fades in to show location, etc.

    Clipboard support is provided by the cut(), copy(), and paste() functions, and the selection can
    be handled in a traditional "mouse" mechanism by setting selectByMouse, or handled completely
    from QML by manipulating selectionStart and selectionEnd, or using selectAll() or selectWord().

    You can translate between cursor positions (characters from the start of the document) and pixel
    points using positionAt() and positionToRectangle().

    \sa Text, TextInput
*/

/*!
    \qmlsignal QtQuick::TextEdit::linkActivated(string link)

    This signal is emitted when the user clicks on a link embedded in the text.
    The link must be in rich text or HTML format and the
    \a link string provides access to the particular link.

    The corresponding handler is \c onLinkActivated.
*/

// This is a pretty arbitrary figure. The idea is that we don't want to break down the document
// into text nodes corresponding to a text block each so that the glyph node grouping doesn't become pointless.
static const int nodeBreakingSize = 300;

namespace {
    class ProtectedLayoutAccessor: public QAbstractTextDocumentLayout
    {
    public:
        inline QTextCharFormat formatAccessor(int pos)
        {
            return format(pos);
        }
    };

    class RootNode : public QSGTransformNode
    {
    public:
        RootNode() : cursorNode(0), frameDecorationsNode(0)
        { }

        void resetFrameDecorations(QQuickTextNode* newNode)
        {
            if (frameDecorationsNode) {
                removeChildNode(frameDecorationsNode);
                delete frameDecorationsNode;
            }
            frameDecorationsNode = newNode;
            newNode->setFlag(QSGNode::OwnedByParent);
        }

        void resetCursorNode(QSGRectangleNode* newNode)
        {
            if (cursorNode)
                removeChildNode(cursorNode);
            delete cursorNode;
            cursorNode = newNode;
            if (cursorNode) {
                appendChildNode(cursorNode);
                cursorNode->setFlag(QSGNode::OwnedByParent);
            }
        }

        QSGRectangleNode *cursorNode;
        QQuickTextNode* frameDecorationsNode;

    };
}

QQuickTextEdit::QQuickTextEdit(QQuickItem *parent)
: QQuickImplicitSizeItem(*(new QQuickTextEditPrivate), parent)
{
    Q_D(QQuickTextEdit);
    d->init();
}

QString QQuickTextEdit::text() const
{
    Q_D(const QQuickTextEdit);
    if (!d->textCached) {
        QQuickTextEditPrivate *d = const_cast<QQuickTextEditPrivate *>(d_func());
#ifndef QT_NO_TEXTHTMLPARSER
        if (d->richText)
            d->text = d->control->toHtml();
        else
#endif
            d->text = d->control->toPlainText();
        d->textCached = true;
    }
    return d->text;
}

/*!
    \qmlproperty string QtQuick::TextEdit::font.family

    Sets the family name of the font.

    The family name is case insensitive and may optionally include a foundry name, e.g. "Helvetica [Cronyx]".
    If the family is available from more than one foundry and the foundry isn't specified, an arbitrary foundry is chosen.
    If the family isn't available a family will be set using the font matching algorithm.
*/

/*!
    \qmlproperty bool QtQuick::TextEdit::font.bold

    Sets whether the font weight is bold.
*/

/*!
    \qmlproperty enumeration QtQuick::TextEdit::font.weight

    Sets the font's weight.

    The weight can be one of:
    \list
    \li Font.Light
    \li Font.Normal - the default
    \li Font.DemiBold
    \li Font.Bold
    \li Font.Black
    \endlist

    \qml
    TextEdit { text: "Hello"; font.weight: Font.DemiBold }
    \endqml
*/

/*!
    \qmlproperty bool QtQuick::TextEdit::font.italic

    Sets whether the font has an italic style.
*/

/*!
    \qmlproperty bool QtQuick::TextEdit::font.underline

    Sets whether the text is underlined.
*/

/*!
    \qmlproperty bool QtQuick::TextEdit::font.strikeout

    Sets whether the font has a strikeout style.
*/

/*!
    \qmlproperty real QtQuick::TextEdit::font.pointSize

    Sets the font size in points. The point size must be greater than zero.
*/

/*!
    \qmlproperty int QtQuick::TextEdit::font.pixelSize

    Sets the font size in pixels.

    Using this function makes the font device dependent.  Use
    \l{TextEdit::font.pointSize} to set the size of the font in a
    device independent manner.
*/

/*!
    \qmlproperty real QtQuick::TextEdit::font.letterSpacing

    Sets the letter spacing for the font.

    Letter spacing changes the default spacing between individual letters in the font.
    A positive value increases the letter spacing by the corresponding pixels; a negative value decreases the spacing.
*/

/*!
    \qmlproperty real QtQuick::TextEdit::font.wordSpacing

    Sets the word spacing for the font.

    Word spacing changes the default spacing between individual words.
    A positive value increases the word spacing by a corresponding amount of pixels,
    while a negative value decreases the inter-word spacing accordingly.
*/

/*!
    \qmlproperty enumeration QtQuick::TextEdit::font.capitalization

    Sets the capitalization for the text.

    \list
    \li Font.MixedCase - This is the normal text rendering option where no capitalization change is applied.
    \li Font.AllUppercase - This alters the text to be rendered in all uppercase type.
    \li Font.AllLowercase - This alters the text to be rendered in all lowercase type.
    \li Font.SmallCaps - This alters the text to be rendered in small-caps type.
    \li Font.Capitalize - This alters the text to be rendered with the first character of each word as an uppercase character.
    \endlist

    \qml
    TextEdit { text: "Hello"; font.capitalization: Font.AllLowercase }
    \endqml
*/

/*!
    \qmlproperty string QtQuick::TextEdit::text

    The text to display.  If the text format is AutoText the text edit will
    automatically determine whether the text should be treated as
    rich text.  This determination is made using Qt::mightBeRichText().

    The text-property is mostly suitable for setting the initial content and
    handling modifications to relatively small text content. The append(),
    insert() and remove() methods provide more fine-grained control and
    remarkably better performance for modifying especially large rich text
    content.
*/
void QQuickTextEdit::setText(const QString &text)
{
    Q_D(QQuickTextEdit);
    if (QQuickTextEdit::text() == text)
        return;

    d->document->clearResources();
    d->richText = d->format == RichText || (d->format == AutoText && Qt::mightBeRichText(text));
    if (!isComponentComplete()) {
        d->text = text;
    } else if (d->richText) {
#ifndef QT_NO_TEXTHTMLPARSER
        d->control->setHtml(text);
#else
        d->control->setPlainText(text);
#endif
    } else {
        d->control->setPlainText(text);
    }
}

/*!
    \qmlproperty enumeration QtQuick::TextEdit::textFormat

    The way the text property should be displayed.

    \list
    \li TextEdit.AutoText
    \li TextEdit.PlainText
    \li TextEdit.RichText
    \endlist

    The default is TextEdit.PlainText.  If the text format is TextEdit.AutoText the text edit
    will automatically determine whether the text should be treated as
    rich text.  This determination is made using Qt::mightBeRichText().

    \table
    \row
    \li
    \qml
Column {
    TextEdit {
        font.pointSize: 24
        text: "<b>Hello</b> <i>World!</i>"
    }
    TextEdit {
        font.pointSize: 24
        textFormat: TextEdit.RichText
        text: "<b>Hello</b> <i>World!</i>"
    }
    TextEdit {
        font.pointSize: 24
        textFormat: TextEdit.PlainText
        text: "<b>Hello</b> <i>World!</i>"
    }
}
    \endqml
    \li \image declarative-textformat.png
    \endtable
*/
QQuickTextEdit::TextFormat QQuickTextEdit::textFormat() const
{
    Q_D(const QQuickTextEdit);
    return d->format;
}

void QQuickTextEdit::setTextFormat(TextFormat format)
{
    Q_D(QQuickTextEdit);
    if (format == d->format)
        return;

    bool wasRich = d->richText;
    d->richText = format == RichText || (format == AutoText && (wasRich || Qt::mightBeRichText(text())));

#ifndef QT_NO_TEXTHTMLPARSER
    if (isComponentComplete()) {
        if (wasRich && !d->richText) {
            d->control->setPlainText(!d->textCached ? d->control->toHtml() : d->text);
            updateSize();
        } else if (!wasRich && d->richText) {
            d->control->setHtml(!d->textCached ? d->control->toPlainText() : d->text);
            updateSize();
        }
    }
#endif

    d->format = format;
    d->control->setAcceptRichText(d->format != PlainText);
    emit textFormatChanged(d->format);
}

/*!
    \qmlproperty enumeration QtQuick::TextEdit::renderType

    Override the default rendering type for this component.

    Supported render types are:
    \list
    \li Text.QtRendering - the default
    \li Text.NativeRendering
    \endlist

    Select Text.NativeRendering if you prefer text to look native on the target platform and do
    not require advanced features such as transformation of the text. Using such features in
    combination with the NativeRendering render type will lend poor and sometimes pixelated
    results.
*/
QQuickTextEdit::RenderType QQuickTextEdit::renderType() const
{
    Q_D(const QQuickTextEdit);
    return d->renderType;
}

void QQuickTextEdit::setRenderType(QQuickTextEdit::RenderType renderType)
{
    Q_D(QQuickTextEdit);
    if (d->renderType == renderType)
        return;

    d->renderType = renderType;
    emit renderTypeChanged();
    d->updateDefaultTextOption();

    if (isComponentComplete())
        updateSize();
}

QFont QQuickTextEdit::font() const
{
    Q_D(const QQuickTextEdit);
    return d->sourceFont;
}

void QQuickTextEdit::setFont(const QFont &font)
{
    Q_D(QQuickTextEdit);
    if (d->sourceFont == font)
        return;

    d->sourceFont = font;
    QFont oldFont = d->font;
    d->font = font;
    if (d->font.pointSizeF() != -1) {
        // 0.5pt resolution
        qreal size = qRound(d->font.pointSizeF()*2.0);
        d->font.setPointSizeF(size/2.0);
    }

    if (oldFont != d->font) {
        d->document->setDefaultFont(d->font);
        if (d->cursorItem) {
            d->cursorItem->setHeight(QFontMetrics(d->font).height());
            moveCursorDelegate();
        }
        updateSize();
        updateWholeDocument();
#ifndef QT_NO_IM
        updateInputMethod(Qt::ImCursorRectangle | Qt::ImFont);
#endif
    }
    emit fontChanged(d->sourceFont);
}

/*!
    \qmlproperty color QtQuick::TextEdit::color

    The text color.

    \qml
    // green text using hexadecimal notation
    TextEdit { color: "#00FF00" }
    \endqml

    \qml
    // steelblue text using SVG color name
    TextEdit { color: "steelblue" }
    \endqml
*/
QColor QQuickTextEdit::color() const
{
    Q_D(const QQuickTextEdit);
    return d->color;
}

void QQuickTextEdit::setColor(const QColor &color)
{
    Q_D(QQuickTextEdit);
    if (d->color == color)
        return;

    d->color = color;
    updateWholeDocument();
    emit colorChanged(d->color);
}

/*!
    \qmlproperty color QtQuick::TextEdit::selectionColor

    The text highlight color, used behind selections.
*/
QColor QQuickTextEdit::selectionColor() const
{
    Q_D(const QQuickTextEdit);
    return d->selectionColor;
}

void QQuickTextEdit::setSelectionColor(const QColor &color)
{
    Q_D(QQuickTextEdit);
    if (d->selectionColor == color)
        return;

    d->selectionColor = color;
    updateWholeDocument();
    emit selectionColorChanged(d->selectionColor);
}

/*!
    \qmlproperty color QtQuick::TextEdit::selectedTextColor

    The selected text color, used in selections.
*/
QColor QQuickTextEdit::selectedTextColor() const
{
    Q_D(const QQuickTextEdit);
    return d->selectedTextColor;
}

void QQuickTextEdit::setSelectedTextColor(const QColor &color)
{
    Q_D(QQuickTextEdit);
    if (d->selectedTextColor == color)
        return;

    d->selectedTextColor = color;
    updateWholeDocument();
    emit selectedTextColorChanged(d->selectedTextColor);
}

/*!
    \qmlproperty enumeration QtQuick::TextEdit::horizontalAlignment
    \qmlproperty enumeration QtQuick::TextEdit::verticalAlignment
    \qmlproperty enumeration QtQuick::TextEdit::effectiveHorizontalAlignment

    Sets the horizontal and vertical alignment of the text within the TextEdit item's
    width and height. By default, the text alignment follows the natural alignment
    of the text, for example text that is read from left to right will be aligned to
    the left.

    Valid values for \c horizontalAlignment are:
    \list
    \li TextEdit.AlignLeft (default)
    \li TextEdit.AlignRight
    \li TextEdit.AlignHCenter
    \li TextEdit.AlignJustify
    \endlist

    Valid values for \c verticalAlignment are:
    \list
    \li TextEdit.AlignTop (default)
    \li TextEdit.AlignBottom
    \li TextEdit.AlignVCenter
    \endlist

    When using the attached property LayoutMirroring::enabled to mirror application
    layouts, the horizontal alignment of text will also be mirrored. However, the property
    \c horizontalAlignment will remain unchanged. To query the effective horizontal alignment
    of TextEdit, use the read-only property \c effectiveHorizontalAlignment.
*/
QQuickTextEdit::HAlignment QQuickTextEdit::hAlign() const
{
    Q_D(const QQuickTextEdit);
    return d->hAlign;
}

void QQuickTextEdit::setHAlign(HAlignment align)
{
    Q_D(QQuickTextEdit);
    bool forceAlign = d->hAlignImplicit && d->effectiveLayoutMirror;
    d->hAlignImplicit = false;
    if (d->setHAlign(align, forceAlign) && isComponentComplete()) {
        d->updateDefaultTextOption();
        updateSize();
    }
}

void QQuickTextEdit::resetHAlign()
{
    Q_D(QQuickTextEdit);
    d->hAlignImplicit = true;
    if (d->determineHorizontalAlignment() && isComponentComplete()) {
        d->updateDefaultTextOption();
        updateSize();
    }
}

QQuickTextEdit::HAlignment QQuickTextEdit::effectiveHAlign() const
{
    Q_D(const QQuickTextEdit);
    QQuickTextEdit::HAlignment effectiveAlignment = d->hAlign;
    if (!d->hAlignImplicit && d->effectiveLayoutMirror) {
        switch (d->hAlign) {
        case QQuickTextEdit::AlignLeft:
            effectiveAlignment = QQuickTextEdit::AlignRight;
            break;
        case QQuickTextEdit::AlignRight:
            effectiveAlignment = QQuickTextEdit::AlignLeft;
            break;
        default:
            break;
        }
    }
    return effectiveAlignment;
}

bool QQuickTextEditPrivate::setHAlign(QQuickTextEdit::HAlignment alignment, bool forceAlign)
{
    Q_Q(QQuickTextEdit);
    if (hAlign != alignment || forceAlign) {
        QQuickTextEdit::HAlignment oldEffectiveHAlign = q->effectiveHAlign();
        hAlign = alignment;
        emit q->horizontalAlignmentChanged(alignment);
        if (oldEffectiveHAlign != q->effectiveHAlign())
            emit q->effectiveHorizontalAlignmentChanged();
        return true;
    }
    return false;
}


Qt::LayoutDirection QQuickTextEditPrivate::textDirection(const QString &text) const
{
    const QChar *character = text.constData();
    while (!character->isNull()) {
        switch (character->direction()) {
        case QChar::DirL:
            return Qt::LeftToRight;
        case QChar::DirR:
        case QChar::DirAL:
        case QChar::DirAN:
            return Qt::RightToLeft;
        default:
            break;
        }
        character++;
    }
    return Qt::LayoutDirectionAuto;
}

bool QQuickTextEditPrivate::determineHorizontalAlignment()
{
    Q_Q(QQuickTextEdit);
    if (hAlignImplicit && q->isComponentComplete()) {
        Qt::LayoutDirection direction = contentDirection;
#ifndef QT_NO_IM
        if (direction == Qt::LayoutDirectionAuto) {
            const QString preeditText = control->textCursor().block().layout()->preeditAreaText();
            direction = textDirection(preeditText);
        }
        if (direction == Qt::LayoutDirectionAuto)
            direction = qGuiApp->inputMethod()->inputDirection();
#endif

        return setHAlign(direction == Qt::RightToLeft ? QQuickTextEdit::AlignRight : QQuickTextEdit::AlignLeft);
    }
    return false;
}

void QQuickTextEditPrivate::mirrorChange()
{
    Q_Q(QQuickTextEdit);
    if (q->isComponentComplete()) {
        if (!hAlignImplicit && (hAlign == QQuickTextEdit::AlignRight || hAlign == QQuickTextEdit::AlignLeft)) {
            updateDefaultTextOption();
            q->updateSize();
            emit q->effectiveHorizontalAlignmentChanged();
        }
    }
}

#ifndef QT_NO_IM
Qt::InputMethodHints QQuickTextEditPrivate::effectiveInputMethodHints() const
{
    return inputMethodHints | Qt::ImhMultiLine;
}
#endif

QQuickTextEdit::VAlignment QQuickTextEdit::vAlign() const
{
    Q_D(const QQuickTextEdit);
    return d->vAlign;
}

void QQuickTextEdit::setVAlign(QQuickTextEdit::VAlignment alignment)
{
    Q_D(QQuickTextEdit);
    if (alignment == d->vAlign)
        return;
    d->vAlign = alignment;
    d->updateDefaultTextOption();
    updateSize();
    moveCursorDelegate();
    emit verticalAlignmentChanged(d->vAlign);
}
/*!
    \qmlproperty enumeration QtQuick::TextEdit::wrapMode

    Set this property to wrap the text to the TextEdit item's width.
    The text will only wrap if an explicit width has been set.

    \list
    \li TextEdit.NoWrap - no wrapping will be performed. If the text contains insufficient newlines, then implicitWidth will exceed a set width.
    \li TextEdit.WordWrap - wrapping is done on word boundaries only. If a word is too long, implicitWidth will exceed a set width.
    \li TextEdit.WrapAnywhere - wrapping is done at any point on a line, even if it occurs in the middle of a word.
    \li TextEdit.Wrap - if possible, wrapping occurs at a word boundary; otherwise it will occur at the appropriate point on the line, even in the middle of a word.
    \endlist

    The default is TextEdit.NoWrap. If you set a width, consider using TextEdit.Wrap.
*/
QQuickTextEdit::WrapMode QQuickTextEdit::wrapMode() const
{
    Q_D(const QQuickTextEdit);
    return d->wrapMode;
}

void QQuickTextEdit::setWrapMode(WrapMode mode)
{
    Q_D(QQuickTextEdit);
    if (mode == d->wrapMode)
        return;
    d->wrapMode = mode;
    d->updateDefaultTextOption();
    updateSize();
    emit wrapModeChanged();
}

/*!
    \qmlproperty int QtQuick::TextEdit::lineCount

    Returns the total number of lines in the textEdit item.
*/
int QQuickTextEdit::lineCount() const
{
    Q_D(const QQuickTextEdit);
    return d->lineCount;
}

/*!
    \qmlproperty int QtQuick::TextEdit::length

    Returns the total number of plain text characters in the TextEdit item.

    As this number doesn't include any formatting markup it may not be the same as the
    length of the string returned by the \l text property.

    This property can be faster than querying the length the \l text property as it doesn't
    require any copying or conversion of the TextEdit's internal string data.
*/

int QQuickTextEdit::length() const
{
    Q_D(const QQuickTextEdit);
    // QTextDocument::characterCount() includes the terminating null character.
    return qMax(0, d->document->characterCount() - 1);
}

/*!
    \qmlproperty real QtQuick::TextEdit::contentWidth

    Returns the width of the text, including the width past the width
    which is covered due to insufficient wrapping if \l wrapMode is set.
*/
qreal QQuickTextEdit::contentWidth() const
{
    Q_D(const QQuickTextEdit);
    return d->contentSize.width();
}

/*!
    \qmlproperty real QtQuick::TextEdit::contentHeight

    Returns the height of the text, including the height past the height
    that is covered if the text does not fit within the set height.
*/
qreal QQuickTextEdit::contentHeight() const
{
    Q_D(const QQuickTextEdit);
    return d->contentSize.height();
}

/*!
    \qmlproperty url QtQuick::TextEdit::baseUrl

    This property specifies a base URL which is used to resolve relative URLs
    within the text.

    The default value is the url of the QML file instantiating the TextEdit item.
*/

QUrl QQuickTextEdit::baseUrl() const
{
    Q_D(const QQuickTextEdit);
    if (d->baseUrl.isEmpty()) {
        if (QQmlContext *context = qmlContext(this))
            const_cast<QQuickTextEditPrivate *>(d)->baseUrl = context->baseUrl();
    }
    return d->baseUrl;
}

void QQuickTextEdit::setBaseUrl(const QUrl &url)
{
    Q_D(QQuickTextEdit);
    if (baseUrl() != url) {
        d->baseUrl = url;

        d->document->setBaseUrl(url);
        emit baseUrlChanged();
    }
}

void QQuickTextEdit::resetBaseUrl()
{
    if (QQmlContext *context = qmlContext(this))
        setBaseUrl(context->baseUrl());
    else
        setBaseUrl(QUrl());
}

/*!
    \qmlmethod rectangle QtQuick::TextEdit::positionToRectangle(position)

    Returns the rectangle at the given \a position in the text. The x, y,
    and height properties correspond to the cursor that would describe
    that position.
*/
QRectF QQuickTextEdit::positionToRectangle(int pos) const
{
    Q_D(const QQuickTextEdit);
    QTextCursor c(d->document);
    c.setPosition(pos);
    return d->control->cursorRect(c).translated(d->xoff, d->yoff);

}

/*!
    \qmlmethod int QtQuick::TextEdit::positionAt(int x, int y)

    Returns the text position closest to pixel position (\a x, \a y).

    Position 0 is before the first character, position 1 is after the first character
    but before the second, and so on until position \l {text}.length, which is after all characters.
*/
int QQuickTextEdit::positionAt(qreal x, qreal y) const
{
    Q_D(const QQuickTextEdit);
    x -= d->xoff;
    y -= d->yoff;

    int r = d->document->documentLayout()->hitTest(QPointF(x, y), Qt::FuzzyHit);
#ifndef QT_NO_IM
    QTextCursor cursor = d->control->textCursor();
    if (r > cursor.position()) {
        // The cursor position includes positions within the preedit text, but only positions in the
        // same text block are offset so it is possible to get a position that is either part of the
        // preedit or the next text block.
        QTextLayout *layout = cursor.block().layout();
        const int preeditLength = layout
                ? layout->preeditAreaText().length()
                : 0;
        if (preeditLength > 0
                && d->document->documentLayout()->blockBoundingRect(cursor.block()).contains(x, y)) {
            r = r > cursor.position() + preeditLength
                    ? r - preeditLength
                    : cursor.position();
        }
    }
#endif
    return r;
}

/*!
    \qmlmethod QtQuick::TextEdit::moveCursorSelection(int position, SelectionMode mode = TextEdit.SelectCharacters)

    Moves the cursor to \a position and updates the selection according to the optional \a mode
    parameter. (To only move the cursor, set the \l cursorPosition property.)

    When this method is called it additionally sets either the
    selectionStart or the selectionEnd (whichever was at the previous cursor position)
    to the specified position. This allows you to easily extend and contract the selected
    text range.

    The selection mode specifies whether the selection is updated on a per character or a per word
    basis.  If not specified the selection mode will default to TextEdit.SelectCharacters.

    \list
    \li TextEdit.SelectCharacters - Sets either the selectionStart or selectionEnd (whichever was at
    the previous cursor position) to the specified position.
    \li TextEdit.SelectWords - Sets the selectionStart and selectionEnd to include all
    words between the specified position and the previous cursor position.  Words partially in the
    range are included.
    \endlist

    For example, take this sequence of calls:

    \code
        cursorPosition = 5
        moveCursorSelection(9, TextEdit.SelectCharacters)
        moveCursorSelection(7, TextEdit.SelectCharacters)
    \endcode

    This moves the cursor to position 5, extend the selection end from 5 to 9
    and then retract the selection end from 9 to 7, leaving the text from position 5 to 7
    selected (the 6th and 7th characters).

    The same sequence with TextEdit.SelectWords will extend the selection start to a word boundary
    before or on position 5 and extend the selection end to a word boundary on or past position 9.
*/
void QQuickTextEdit::moveCursorSelection(int pos)
{
    //Note that this is the same as setCursorPosition but with the KeepAnchor flag set
    Q_D(QQuickTextEdit);
    QTextCursor cursor = d->control->textCursor();
    if (cursor.position() == pos)
        return;
    cursor.setPosition(pos, QTextCursor::KeepAnchor);
    d->control->setTextCursor(cursor);
}

void QQuickTextEdit::moveCursorSelection(int pos, SelectionMode mode)
{
    Q_D(QQuickTextEdit);
    QTextCursor cursor = d->control->textCursor();
    if (cursor.position() == pos)
        return;
    if (mode == SelectCharacters) {
        cursor.setPosition(pos, QTextCursor::KeepAnchor);
    } else if (cursor.anchor() < pos || (cursor.anchor() == pos && cursor.position() < pos)) {
        if (cursor.anchor() > cursor.position()) {
            cursor.setPosition(cursor.anchor(), QTextCursor::MoveAnchor);
            cursor.movePosition(QTextCursor::StartOfWord, QTextCursor::KeepAnchor);
            if (cursor.position() == cursor.anchor())
                cursor.movePosition(QTextCursor::PreviousWord, QTextCursor::MoveAnchor);
            else
                cursor.setPosition(cursor.position(), QTextCursor::MoveAnchor);
        } else {
            cursor.setPosition(cursor.anchor(), QTextCursor::MoveAnchor);
            cursor.movePosition(QTextCursor::StartOfWord, QTextCursor::MoveAnchor);
        }

        cursor.setPosition(pos, QTextCursor::KeepAnchor);
        cursor.movePosition(QTextCursor::StartOfWord, QTextCursor::KeepAnchor);
        if (cursor.position() != pos)
            cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
    } else if (cursor.anchor() > pos || (cursor.anchor() == pos && cursor.position() > pos)) {
        if (cursor.anchor() < cursor.position()) {
            cursor.setPosition(cursor.anchor(), QTextCursor::MoveAnchor);
            cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::MoveAnchor);
        } else {
            cursor.setPosition(cursor.anchor(), QTextCursor::MoveAnchor);
            cursor.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor);
            cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
            if (cursor.position() != cursor.anchor()) {
                cursor.setPosition(cursor.anchor(), QTextCursor::MoveAnchor);
                cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::MoveAnchor);
            }
        }

        cursor.setPosition(pos, QTextCursor::KeepAnchor);
        cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
        if (cursor.position() != pos) {
            cursor.movePosition(QTextCursor::PreviousCharacter, QTextCursor::KeepAnchor);
            cursor.movePosition(QTextCursor::StartOfWord, QTextCursor::KeepAnchor);
        }
    }
    d->control->setTextCursor(cursor);
}

/*!
    \qmlproperty bool QtQuick::TextEdit::cursorVisible
    If true the text edit shows a cursor.

    This property is set and unset when the text edit gets active focus, but it can also
    be set directly (useful, for example, if a KeyProxy might forward keys to it).
*/
bool QQuickTextEdit::isCursorVisible() const
{
    Q_D(const QQuickTextEdit);
    return d->cursorVisible;
}