/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Controls module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
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****************************************************************************/

#include "qquicktextfield_p.h"

#include <QtQuick/private/qquickitem_p.h>
#include <QtQuick/private/qquicktext_p.h>
#include <QtQuick/private/qquickclipnode_p.h>

QT_BEGIN_NAMESPACE

/*!
    \qmltype TextField
    \inherits TextInput
    \instantiates QQuickTextField
    \inqmlmodule QtQuick.Controls
    \ingroup editors
    \brief A single line text input control.

    TextField is a single line text editor. TextField extends TextInput
    with a \l placeholder text functionality, and adds decoration.

    \table
    \row \li \image qtquickcontrols2-textfield-normal.png
         \li A text field in its normal state.
    \row \li \image qtquickcontrols2-textfield-focused.png
         \li A text field that has active focus.
    \row \li \image qtquickcontrols2-textfield-disabled.png
         \li A text field that is disabled.
    \endtable

    \code
    TextField {
        placeholder.text: qsTr("Enter name")
    }
    \endcode

    \sa TextArea, {Customizing TextField}
*/

class QQuickTextFieldPrivate
{
    Q_DECLARE_PUBLIC(QQuickTextField)

public:
    QQuickTextFieldPrivate() : background(Q_NULLPTR), placeholder(Q_NULLPTR) { }

    void resizeBackground();

    QQuickItem *background;
    QQuickText *placeholder;
    QQuickTextField *q_ptr;
};

void QQuickTextFieldPrivate::resizeBackground()
{
    Q_Q(QQuickTextField);
    if (background) {
        QQuickItemPrivate *p = QQuickItemPrivate::get(background);
        if (!p->widthValid && qFuzzyIsNull(background->x())) {
            background->setWidth(q->width());
            p->widthValid = false;
        }
        if (!p->heightValid && qFuzzyIsNull(background->y())) {
            background->setHeight(q->height());
            p->heightValid = false;
        }
    }
}

QQuickTextField::QQuickTextField(QQuickItem *parent) :
    QQuickTextInput(parent), d_ptr(new QQuickTextFieldPrivate)
{
    Q_D(QQuickTextField);
    d->q_ptr = this;
}

QQuickTextField::~QQuickTextField()
{
}

/*!
    \qmlproperty Item QtQuickControls2::TextField::background

    This property holds the background item.

    \note If the background item has no explicit size specified, it automatically
          follows the control's size. In most cases, there is no need to specify
          width or height for a background item.

    \sa {Customizing TextField}
*/
QQuickItem *QQuickTextField::background() const
{
    Q_D(const QQuickTextField);
    return d->background;
}

void QQuickTextField::setBackground(QQuickItem *background)
{
    Q_D(QQuickTextField);
    if (d->background != background) {
        delete d->background;
        d->background = background;
        if (background) {
            background->setParentItem(this);
            if (qFuzzyIsNull(background->z()))
                background->setZ(-1);
            if (isComponentComplete())
                d->resizeBackground();
        }
        emit backgroundChanged();
    }
}

/*!
    \qmlproperty Text QtQuickControls2::TextField::placeholder

    This property holds the placeholder text item.

    \sa {Customizing TextField}
*/
QQuickText *QQuickTextField::placeholder() const
{
    Q_D(const QQuickTextField);
    return d->placeholder;
}

void QQuickTextField::setPlaceholder(QQuickText *placeholder)
{
    Q_D(QQuickTextField);
    if (d->placeholder != placeholder) {
        delete d->placeholder;
        d->placeholder = placeholder;
        if (placeholder && !placeholder->parentItem())
            placeholder->setParentItem(this);
        emit placeholderChanged();
    }
}

void QQuickTextField::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickTextField);
    QQuickTextInput::geometryChanged(newGeometry, oldGeometry);
    d->resizeBackground();
}

QSGNode *QQuickTextField::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *data)
{
    QQuickDefaultClipNode *clipNode = static_cast<QQuickDefaultClipNode *>(oldNode);
    if (!clipNode)
        clipNode = new QQuickDefaultClipNode(QRectF());

    clipNode->setRect(clipRect().adjusted(leftPadding(), topPadding(), -rightPadding(), -bottomPadding()));
    clipNode->update();

    QSGNode *textNode = QQuickTextInput::updatePaintNode(clipNode->firstChild(), data);
    if (!textNode->parent())
        clipNode->appendChildNode(textNode);

    return clipNode;
}

QT_END_NAMESPACE