/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
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** accordance with the commercial license agreement provided with the
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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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** $QT_END_LICENSE$
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****************************************************************************/

#include "qquicktextfield_p.h"
#include "qquicktextfield_p_p.h"
#include "qquickcontrol_p.h"
#include "qquickcontrol_p_p.h"

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

#ifndef QT_NO_ACCESSIBILITY
#include <QtQuick/private/qquickaccessibleattached_p.h>
#endif

QT_BEGIN_NAMESPACE

/*!
    \qmltype TextField
    \inherits TextInput
    \instantiates QQuickTextField
    \inqmlmodule QtQuick.Controls
    \since 5.7
    \ingroup qtquickcontrols2-input
    \brief A single line text input control.

    TextField is a single line text editor. TextField extends TextInput with
    a \l {placeholderText}{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 {
        placeholderText: qsTr("Enter name")
    }
    \endcode

    \sa TextArea, {Customizing TextField}, {Input Controls}
*/

/*!
    \qmlsignal QtQuick.Controls::TextField::pressAndHold(MouseEvent mouse)

    This signal is emitted when there is a long press (the delay depends on the platform plugin).
    The \l {MouseEvent}{mouse} parameter provides information about the press, including the x and y
    position of the press, and which button is pressed.
*/

QQuickTextFieldPrivate::QQuickTextFieldPrivate()
    : background(nullptr)
    , focusReason(Qt::OtherFocusReason)
    , accessibleAttached(nullptr)
{
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::installActivationObserver(this);
#endif
}

QQuickTextFieldPrivate::~QQuickTextFieldPrivate()
{
#ifndef QT_NO_ACCESSIBILITY
    QAccessible::removeActivationObserver(this);
#endif
}

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;
        }
    }
}

qreal QQuickTextFieldPrivate::getImplicitWidth() const
{
    return QQuickItemPrivate::getImplicitWidth();
}

qreal QQuickTextFieldPrivate::getImplicitHeight() const
{
    return QQuickItemPrivate::getImplicitHeight();
}

void QQuickTextFieldPrivate::implicitWidthChanged()
{
    Q_Q(QQuickTextField);
    QQuickItemPrivate::implicitWidthChanged();
    emit q->implicitWidthChanged3();
}

void QQuickTextFieldPrivate::implicitHeightChanged()
{
    Q_Q(QQuickTextField);
    QQuickItemPrivate::implicitHeightChanged();
    emit q->implicitHeightChanged3();
}

QQuickTextField::QQuickTextField(QQuickItem *parent) :
    QQuickTextInput(*(new QQuickTextFieldPrivate), parent)
{
    Q_D(QQuickTextField);
    d->pressHandler.control = this;
    d->setImplicitResizeEnabled(false);
    setActiveFocusOnTab(true);
#ifndef QT_NO_CURSOR
    setCursor(Qt::IBeamCursor);
#endif
    QObjectPrivate::connect(this, &QQuickTextInput::readOnlyChanged,
                            d, &QQuickTextFieldPrivate::_q_readOnlyChanged);
    QObjectPrivate::connect(this, &QQuickTextInput::echoModeChanged,
                            d, &QQuickTextFieldPrivate::_q_echoModeChanged);
}

QQuickTextField::~QQuickTextField()
{
}

/*!
    \internal

    Determine which font is implicitly imposed on this control by its ancestors
    and QGuiApplication::font, resolve this against its own font (attributes from
    the implicit font are copied over). Then propagate this font to this
    control's children.
*/
void QQuickTextFieldPrivate::resolveFont()
{
    Q_Q(QQuickTextField);
    inheritFont(QQuickControlPrivate::parentFont(q));
}

void QQuickTextFieldPrivate::inheritFont(const QFont &f)
{
    Q_Q(QQuickTextField);
    QFont parentFont = font.resolve(f);
    parentFont.resolve(font.resolve() | f.resolve());

    const QFont defaultFont = QQuickControlPrivate::themeFont(QPlatformTheme::EditorFont);
    const QFont resolvedFont = parentFont.resolve(defaultFont);

    const bool changed = resolvedFont != sourceFont;
    q->QQuickTextInput::setFont(resolvedFont);
    if (changed)
        emit q->fontChanged();
}

void QQuickTextFieldPrivate::_q_readOnlyChanged(bool isReadOnly)
{
#ifndef QT_NO_ACCESSIBILITY
    if (accessibleAttached)
        accessibleAttached->set_readOnly(isReadOnly);
#else
    Q_UNUSED(isReadOnly)
#endif
}

void QQuickTextFieldPrivate::_q_echoModeChanged(QQuickTextField::EchoMode echoMode)
{
#ifndef QT_NO_ACCESSIBILITY
    if (accessibleAttached)
        accessibleAttached->set_passwordEdit((echoMode == QQuickTextField::Password || echoMode == QQuickTextField::PasswordEchoOnEdit) ? true : false);
#else
    Q_UNUSED(echoMode)
#endif
}

#ifndef QT_NO_ACCESSIBILITY
void QQuickTextFieldPrivate::accessibilityActiveChanged(bool active)
{
    if (accessibleAttached || !active)
        return;

    Q_Q(QQuickTextField);
    accessibleAttached = qobject_cast<QQuickAccessibleAttached *>(qmlAttachedPropertiesObject<QQuickAccessibleAttached>(q, true));
    if (accessibleAttached) {
        accessibleAttached->setRole(accessibleRole());
        accessibleAttached->set_readOnly(m_readOnly);
        accessibleAttached->set_passwordEdit((m_echoMode == QQuickTextField::Password || m_echoMode == QQuickTextField::PasswordEchoOnEdit) ? true : false);
        accessibleAttached->setDescription(placeholder);
    } else {
        qWarning() << "QQuickTextField: " << q << " QQuickAccessibleAttached object creation failed!";
    }
}

QAccessible::Role QQuickTextFieldPrivate::accessibleRole() const
{
    return QAccessible::EditableText;
}
#endif

/*
   Deletes "delegate" if Component.completed() has been emitted,
   otherwise stores it in pendingDeletions.
*/
void QQuickTextFieldPrivate::deleteDelegate(QObject *delegate)
{
    if (componentComplete)
        delete delegate;
    else
        pendingDeletions.append(delegate);
}

QFont QQuickTextField::font() const
{
    return QQuickTextInput::font();
}

void QQuickTextField::setFont(const QFont &font)
{
    Q_D(QQuickTextField);
    if (d->font.resolve() == font.resolve() && d->font == font)
        return;

    d->font = font;
    d->resolveFont();
}

/*!
    \qmlproperty Item QtQuick.Controls::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)
        return;

    d->deleteDelegate(d->background);
    d->background = background;
    if (background) {
        background->setParentItem(this);
        if (qFuzzyIsNull(background->z()))
            background->setZ(-1);
        if (isComponentComplete())
            d->resizeBackground();
    }
    emit backgroundChanged();
}

/*!
    \qmlproperty string QtQuick.Controls::TextField::placeholderText

    This property holds the hint that is displayed in the TextField before the user
    enters text.
*/
QString QQuickTextField::placeholderText() const
{
    Q_D(const QQuickTextField);
    return d->placeholder;
}

void QQuickTextField::setPlaceholderText(const QString &text)
{
    Q_D(QQuickTextField);
    if (d->placeholder == text)
        return;

    d->placeholder = text;
#ifndef QT_NO_ACCESSIBILITY
    if (d->accessibleAttached)
        d->accessibleAttached->setDescription(text);
#endif
    emit placeholderTextChanged();
}

/*!
    \qmlproperty enumeration QtQuick.Controls::TextField::focusReason

    This property holds the reason of the last focus change.

    \note This property does not indicate whether the control has \l {Item::activeFocus}
          {active focus}, but the reason why the control either gained or lost focus.

    \value Qt.MouseFocusReason         A mouse action occurred.
    \value Qt.TabFocusReason           The Tab key was pressed.
    \value Qt.BacktabFocusReason       A Backtab occurred. The input for this may include the Shift or Control keys; e.g. Shift+Tab.
    \value Qt.ActiveWindowFocusReason  The window system made this window either active or inactive.
    \value Qt.PopupFocusReason         The application opened/closed a pop-up that grabbed/released the keyboard focus.
    \value Qt.ShortcutFocusReason      The user typed a label's buddy shortcut
    \value Qt.MenuBarFocusReason       The menu bar took focus.
    \value Qt.OtherFocusReason         Another reason, usually application-specific.

    \sa Item::activeFocus
*/
Qt::FocusReason QQuickTextField::focusReason() const
{
    Q_D(const QQuickTextField);
    return d->focusReason;
}

void QQuickTextField::setFocusReason(Qt::FocusReason reason)
{
    Q_D(QQuickTextField);
    if (d->focusReason == reason)
        return;

    d->focusReason = reason;
    emit focusReasonChanged();
}

void QQuickTextField::classBegin()
{
    Q_D(QQuickTextField);
    QQuickTextInput::classBegin();
    d->resolveFont();
}

void QQuickTextField::componentComplete()
{
    Q_D(QQuickTextField);
    QQuickTextInput::componentComplete();
#ifndef QT_NO_ACCESSIBILITY
    if (!d->accessibleAttached && QAccessible::isActive())
        d->accessibilityActiveChanged(true);
#endif

    qDeleteAll(d->pendingDeletions);
    d->pendingDeletions.clear();
}

void QQuickTextField::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &value)
{
    Q_D(QQuickTextField);
    QQuickTextInput::itemChange(change, value);
    if (change == ItemParentHasChanged && value.item)
        d->resolveFont();
}

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;
}

void QQuickTextField::focusInEvent(QFocusEvent *event)
{
    QQuickTextInput::focusInEvent(event);
    setFocusReason(event->reason());
}

void QQuickTextField::focusOutEvent(QFocusEvent *event)
{
    QQuickTextInput::focusOutEvent(event);
    setFocusReason(event->reason());
}

void QQuickTextField::mousePressEvent(QMouseEvent *event)
{
    Q_D(QQuickTextField);
    d->pressHandler.mousePressEvent(event);
    if (d->pressHandler.isActive()) {
        if (d->pressHandler.delayedMousePressEvent) {
            QQuickTextInput::mousePressEvent(d->pressHandler.delayedMousePressEvent);
            d->pressHandler.clearDelayedMouseEvent();
        }
        QQuickTextInput::mousePressEvent(event);
    }
}

void QQuickTextField::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QQuickTextField);
    d->pressHandler.mouseMoveEvent(event);
    if (d->pressHandler.isActive()) {
        if (d->pressHandler.delayedMousePressEvent) {
            QQuickTextInput::mousePressEvent(d->pressHandler.delayedMousePressEvent);
            d->pressHandler.clearDelayedMouseEvent();
        }
        QQuickTextInput::mouseMoveEvent(event);
    }
}

void QQuickTextField::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QQuickTextField);
    d->pressHandler.mouseReleaseEvent(event);
    if (d->pressHandler.isActive()) {
        if (d->pressHandler.delayedMousePressEvent) {
            QQuickTextInput::mousePressEvent(d->pressHandler.delayedMousePressEvent);
            d->pressHandler.clearDelayedMouseEvent();
        }
        QQuickTextInput::mouseReleaseEvent(event);
    }
}

void QQuickTextField::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_D(QQuickTextField);
    if (d->pressHandler.delayedMousePressEvent) {
        QQuickTextInput::mousePressEvent(d->pressHandler.delayedMousePressEvent);
        d->pressHandler.clearDelayedMouseEvent();
    }
    QQuickTextInput::mouseDoubleClickEvent(event);
}

void QQuickTextField::timerEvent(QTimerEvent *event)
{
    Q_D(QQuickTextField);
    if (event->timerId() == d->pressHandler.timer.timerId()) {
        d->pressHandler.timerEvent(event);
    } else {
        QQuickTextInput::timerEvent(event);
    }
}

QT_END_NAMESPACE
