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path: root/src/templates/qquickcontrol.cpp
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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Labs Templates module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** 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
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** 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
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qquickcontrol_p.h"
#include "qquickcontrol_p_p.h"

#include <QtGui/qguiapplication.h>
#include "qquicklabel_p.h"
#include "qquicklabel_p_p.h"
#include "qquicktextarea_p.h"
#include "qquicktextarea_p_p.h"
#include "qquicktextfield_p.h"
#include "qquicktextfield_p_p.h"

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

QT_BEGIN_NAMESPACE

/*!
    \qmltype Control
    \inherits Item
    \instantiates QQuickControl
    \inqmlmodule QtQuick.Controls
    \brief A user interface control.

    Control is the base type of user interface controls.
*/

QQuickControlPrivate::QQuickControlPrivate() :
    hasTopPadding(false), hasLeftPadding(false), hasRightPadding(false), hasBottomPadding(false),
    padding(0), topPadding(0), leftPadding(0), rightPadding(0), bottomPadding(0), spacing(0),
    layoutDirection(Qt::LeftToRight), background(Q_NULLPTR), contentItem(Q_NULLPTR),
    accessibleAttached(Q_NULLPTR), accessibleRole(0) // QAccessible::NoRole
{
}

void QQuickControlPrivate::mirrorChange()
{
    Q_Q(QQuickControl);
    q->mirrorChange();
}

void QQuickControlPrivate::setTopPadding(qreal value, bool reset)
{
    Q_Q(QQuickControl);
    qreal oldPadding = q->topPadding();
    topPadding = value;
    hasTopPadding = !reset;
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding))) {
        emit q->topPaddingChanged();
        emit q->availableHeightChanged();
        q->paddingChange(QMarginsF(leftPadding, topPadding, rightPadding, bottomPadding),
                         QMarginsF(leftPadding, oldPadding, rightPadding, bottomPadding));
    }
}

void QQuickControlPrivate::setLeftPadding(qreal value, bool reset)
{
    Q_Q(QQuickControl);
    qreal oldPadding = q->leftPadding();
    leftPadding = value;
    hasLeftPadding = !reset;
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding))) {
        emit q->leftPaddingChanged();
        emit q->availableWidthChanged();
        q->paddingChange(QMarginsF(leftPadding, topPadding, rightPadding, bottomPadding),
                         QMarginsF(oldPadding, topPadding, rightPadding, bottomPadding));
    }
}

void QQuickControlPrivate::setRightPadding(qreal value, bool reset)
{
    Q_Q(QQuickControl);
    qreal oldPadding = q->rightPadding();
    rightPadding = value;
    hasRightPadding = !reset;
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding))) {
        emit q->rightPaddingChanged();
        emit q->availableWidthChanged();
        q->paddingChange(QMarginsF(leftPadding, topPadding, rightPadding, bottomPadding),
                         QMarginsF(leftPadding, topPadding, oldPadding, bottomPadding));
    }
}

void QQuickControlPrivate::setBottomPadding(qreal value, bool reset)
{
    Q_Q(QQuickControl);
    qreal oldPadding = q->bottomPadding();
    bottomPadding = value;
    hasBottomPadding = !reset;
    if ((!reset && !qFuzzyCompare(oldPadding, value)) || (reset && !qFuzzyCompare(oldPadding, padding))) {
        emit q->bottomPaddingChanged();
        emit q->availableHeightChanged();
        q->paddingChange(QMarginsF(leftPadding, topPadding, rightPadding, bottomPadding),
                         QMarginsF(leftPadding, topPadding, rightPadding, oldPadding));
    }
}

void QQuickControlPrivate::resizeBackground()
{
    Q_Q(QQuickControl);
    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;
        }
    }
}

void QQuickControlPrivate::resizeContent()
{
    Q_Q(QQuickControl);
    if (contentItem) {
        contentItem->setPosition(QPointF(q->leftPadding(), q->topPadding()));
        contentItem->setSize(QSizeF(q->availableWidth(), q->availableHeight()));
    }
}

/*!
    \internal

    Returns the font that the control w inherits from its ancestors and
    QGuiApplication::font.
*/
QFont QQuickControlPrivate::naturalControlFont(const QQuickItem *q)
{
    QFont naturalFont = QGuiApplication::font();
    QQuickItem *p = q->parentItem();
    while (p) {
        if (QQuickControl *qc = qobject_cast<QQuickControl *>(p)) {
            naturalFont = qc->font();
            break;
        }

        p = p->parentItem();
    }

    naturalFont.resolve(0);
    return naturalFont;
}

/*!
    \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 QQuickControlPrivate::resolveFont()
{
    Q_Q(const QQuickControl);
    QFont naturalFont = QQuickControlPrivate::naturalControlFont(q);
    QFont resolvedFont = font.resolve(naturalFont);
    setFont_helper(resolvedFont);
}

/*!
    \internal

    Assign \a font to this control, and propagate it to all children.
*/
void QQuickControlPrivate::updateFont(const QFont &f)
{
    Q_Q(QQuickControl);
    font = f;

    QQuickControlPrivate::updateFontRecur(q, f);

    emit q->fontChanged();
}

void QQuickControlPrivate::updateFontRecur(QQuickItem *item, const QFont &f)
{
    foreach (QQuickItem *child, item->childItems()) {
        if (QQuickControl *control = qobject_cast<QQuickControl *>(child))
            QQuickControlPrivate::get(control)->resolveFont();
        else if (QQuickLabel *label = qobject_cast<QQuickLabel *>(child))
            QQuickLabelPrivate::get(label)->resolveFont();
        else if (QQuickTextArea *textArea = qobject_cast<QQuickTextArea *>(child))
            QQuickTextAreaPrivate::get(textArea)->resolveFont();
        else if (QQuickTextField *textField = qobject_cast<QQuickTextField *>(child))
            QQuickTextFieldPrivate::get(textField)->resolveFont();
        else
            QQuickControlPrivate::updateFontRecur(child, f);
    }
}

int QQuickControl::accessibleRole() const
{
#ifndef QT_NO_ACCESSIBILITY
    Q_D(const QQuickControl);
    if (d->accessibleAttached)
        return d->accessibleAttached->role();
#endif
    return 0; // QAccessible::NoRole
}

void QQuickControl::setAccessibleRole(int role)
{
    Q_D(QQuickControl);
    d->accessibleRole = role;
#ifndef QT_NO_ACCESSIBILITY
    if (d->accessibleAttached)
        d->accessibleAttached->setRole((QAccessible::Role)role);
#endif
}

QString QQuickControl::accessibleName() const
{
#ifndef QT_NO_ACCESSIBILITY
    Q_D(const QQuickControl);
    if (d->accessibleAttached)
        return d->accessibleAttached->name();
#endif
    return QString();
}

void QQuickControl::setAccessibleName(const QString &name)
{
#ifndef QT_NO_ACCESSIBILITY
    Q_D(QQuickControl);
    if (d->accessibleAttached)
        d->accessibleAttached->setName(name);
#else
    Q_UNUSED(name)
#endif
}

QVariant QQuickControl::accessibleProperty(const char *propertyName)
{
#ifndef QT_NO_ACCESSIBILITY
    Q_D(QQuickControl);
    if (d->accessibleAttached)
        return QQuickAccessibleAttached::property(this, propertyName);
#endif
    Q_UNUSED(propertyName)
    return QVariant();
}

bool QQuickControl::setAccessibleProperty(const char *propertyName, const QVariant &value)
{
#ifndef QT_NO_ACCESSIBILITY
    Q_D(QQuickControl);
    if (d->accessibleAttached)
        return QQuickAccessibleAttached::setProperty(this, propertyName, value);
#endif
    Q_UNUSED(propertyName)
    Q_UNUSED(value)
    return false;
}

QQuickControl::QQuickControl(QQuickItem *parent) :
    QQuickItem(*(new QQuickControlPrivate), parent)
{
}

QQuickControl::QQuickControl(QQuickControlPrivate &dd, QQuickItem *parent) :
    QQuickItem(dd, parent)
{
}

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

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

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

    // Determine which font is inherited from this control's ancestors and
    // QGuiApplication::font, resolve this against \a font (attributes from the
    // inherited font are copied over). Then propagate this font to this
    // control's children.
    QFont naturalFont = QQuickControlPrivate::naturalControlFont(this);
    QFont resolvedFont = f.resolve(naturalFont);
    d->setFont_helper(resolvedFont);
}

void QQuickControl::resetFont()
{
    setFont(QFont());
}

/*!
    \qmlproperty real QtQuick.Controls::Control::availableWidth

    This property holds the width available after deducting horizontal padding.

    \sa padding, leftPadding, rightPadding
*/
qreal QQuickControl::availableWidth() const
{
    return width() - leftPadding() - rightPadding();
}

/*!
    \qmlproperty real QtQuick.Controls::Control::availableHeight

    This property holds the height available after deducting vertical padding.

    \sa padding, topPadding, bottomPadding
*/
qreal QQuickControl::availableHeight() const
{
    return height() - topPadding() - bottomPadding();
}

/*!
    \qmlproperty real QtQuick.Controls::Control::padding

    This property holds the default padding.

    \sa availableWidth, availableHeight, topPadding, leftPadding, rightPadding, bottomPadding
*/
qreal QQuickControl::padding() const
{
    Q_D(const QQuickControl);
    return d->padding;
}

void QQuickControl::setPadding(qreal padding)
{
    Q_D(QQuickControl);
    if (qFuzzyCompare(d->padding, padding))
        return;
    QMarginsF oldPadding(leftPadding(), topPadding(), rightPadding(), bottomPadding());
    d->padding = padding;
    emit paddingChanged();
    QMarginsF newPadding(leftPadding(), topPadding(), rightPadding(), bottomPadding());
    if (!qFuzzyCompare(newPadding.top(), oldPadding.top()))
        emit topPaddingChanged();
    if (!qFuzzyCompare(newPadding.left(), oldPadding.left()))
        emit leftPaddingChanged();
    if (!qFuzzyCompare(newPadding.right(), oldPadding.right()))
        emit rightPaddingChanged();
    if (!qFuzzyCompare(newPadding.bottom(), oldPadding.bottom()))
        emit bottomPaddingChanged();
    if (!qFuzzyCompare(newPadding.top(), oldPadding.top()) || !qFuzzyCompare(newPadding.bottom(), oldPadding.bottom()))
        emit availableHeightChanged();
    if (!qFuzzyCompare(newPadding.left(), oldPadding.left()) || !qFuzzyCompare(newPadding.right(), oldPadding.right()))
        emit availableWidthChanged();
    paddingChange(newPadding, oldPadding);
}

void QQuickControl::resetPadding()
{
    setPadding(0);
}

/*!
    \qmlproperty real QtQuick.Controls::Control::topPadding

    This property holds the top padding.

    \sa padding, bottomPadding, availableHeight
*/
qreal QQuickControl::topPadding() const
{
    Q_D(const QQuickControl);
    if (d->hasTopPadding)
        return d->topPadding;
    return d->padding;
}

void QQuickControl::setTopPadding(qreal padding)
{
    Q_D(QQuickControl);
    d->setTopPadding(padding);
}

void QQuickControl::resetTopPadding()
{
    Q_D(QQuickControl);
    d->setTopPadding(0, true);
}

/*!
    \qmlproperty real QtQuick.Controls::Control::leftPadding

    This property holds the left padding.

    \sa padding, rightPadding, availableWidth
*/
qreal QQuickControl::leftPadding() const
{
    Q_D(const QQuickControl);
    if (d->hasLeftPadding)
        return d->leftPadding;
    return d->padding;
}

void QQuickControl::setLeftPadding(qreal padding)
{
    Q_D(QQuickControl);
    d->setLeftPadding(padding);
}

void QQuickControl::resetLeftPadding()
{
    Q_D(QQuickControl);
    d->setLeftPadding(0, true);
}

/*!
    \qmlproperty real QtQuick.Controls::Control::rightPadding

    This property holds the right padding.

    \sa padding, leftPadding, availableWidth
*/
qreal QQuickControl::rightPadding() const
{
    Q_D(const QQuickControl);
    if (d->hasRightPadding)
        return d->rightPadding;
    return d->padding;
}

void QQuickControl::setRightPadding(qreal padding)
{
    Q_D(QQuickControl);
    d->setRightPadding(padding);
}

void QQuickControl::resetRightPadding()
{
    Q_D(QQuickControl);
    d->setRightPadding(0, true);
}

/*!
    \qmlproperty real QtQuick.Controls::Control::bottomPadding

    This property holds the bottom padding.

    \sa padding, topPadding, availableHeight
*/
qreal QQuickControl::bottomPadding() const
{
    Q_D(const QQuickControl);
    if (d->hasBottomPadding)
        return d->bottomPadding;
    return d->padding;
}

void QQuickControl::setBottomPadding(qreal padding)
{
    Q_D(QQuickControl);
    d->setBottomPadding(padding);
}

void QQuickControl::resetBottomPadding()
{
    Q_D(QQuickControl);
    d->setBottomPadding(0, true);
}

/*!
    \qmlproperty real QtQuick.Controls::Control::spacing

    This property holds the spacing.
*/
qreal QQuickControl::spacing() const
{
    Q_D(const QQuickControl);
    return d->spacing;
}

void QQuickControl::setSpacing(qreal spacing)
{
    Q_D(QQuickControl);
    if (!qFuzzyCompare(d->spacing, spacing)) {
        d->spacing = spacing;
        emit spacingChanged();
    }
}

void QQuickControl::resetSpacing()
{
    setSpacing(0);
}

/*!
    \qmlproperty enumeration QtQuick.Controls::Control::layoutDirection

    This property holds the layout direction of the control.

    Possible values:
    \list
    \li Qt.LeftToRight (default) - Items are laid out from left to right. If the width of the row is explicitly set,
    the left anchor remains to the left of the row.
    \li Qt.RightToLeft - Items are laid out from right to left. If the width of the row is explicitly set,
    the right anchor remains to the right of the row.
    \endlist

    \sa effectiveLayoutDirection
*/
Qt::LayoutDirection QQuickControl::layoutDirection() const
{
    Q_D(const QQuickControl);
    return d->layoutDirection;
}

/*!
    \qmlproperty enumeration QtQuick.Controls::Control::effectiveLayoutDirection
    \readonly

    This property holds the effective layout direction of the control.

    When using the attached property \l {LayoutMirroring::enabled}{LayoutMirroring::enabled}
    for locale layouts, the visual layout direction of the control will be mirrored. However,
    the \l layoutDirection property will remain unchanged.

    \sa layoutDirection, {LayoutMirroring}{LayoutMirroring}
*/
Qt::LayoutDirection QQuickControl::effectiveLayoutDirection() const
{
    Q_D(const QQuickControl);
    if (d->isMirrored())
        return d->layoutDirection == Qt::RightToLeft ? Qt::LeftToRight : Qt::RightToLeft;
    return d->layoutDirection;
}

void QQuickControl::setLayoutDirection(Qt::LayoutDirection direction)
{
    Q_D(QQuickControl);
    if (d->layoutDirection != direction) {
        d->layoutDirection = direction;
        emit layoutDirectionChanged();
        mirrorChange();
    }
}

/*!
    \qmlproperty bool QtQuick.Controls::Control::mirrored
    \readonly

    This property holds whether the control is mirrored.

    This property is provided for convenience. A control is considered mirrored
    when its visual layout direction is right-to-left.

    \sa effectiveLayoutDirection, {LayoutMirroring}{LayoutMirroring}
*/
bool QQuickControl::isMirrored() const
{
    return effectiveLayoutDirection() == Qt::RightToLeft;
}

/*!
    \qmlproperty Item QtQuick.Controls::Control::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.
*/
QQuickItem *QQuickControl::background() const
{
    Q_D(const QQuickControl);
    return d->background;
}

void QQuickControl::setBackground(QQuickItem *background)
{
    Q_D(QQuickControl);
    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 Item QtQuick.Controls::Control::contentItem

    TODO
*/
QQuickItem *QQuickControl::contentItem() const
{
    Q_D(const QQuickControl);
    return d->contentItem;
}

void QQuickControl::setContentItem(QQuickItem *item)
{
    Q_D(QQuickControl);
    if (d->contentItem != item) {
        contentItemChange(item, d->contentItem);
        delete d->contentItem;
        d->contentItem = item;
        if (item) {
            if (!item->parentItem())
                item->setParentItem(this);
            if (isComponentComplete())
                d->resizeContent();
        }
        emit contentItemChanged();
    }
}

void QQuickControl::classBegin()
{
    QQuickItem::classBegin();
#ifndef QT_NO_ACCESSIBILITY
    Q_D(QQuickControl);
    d->accessibleAttached = qobject_cast<QQuickAccessibleAttached *>(qmlAttachedPropertiesObject<QQuickAccessibleAttached>(this, true));
    if (d->accessibleAttached)
        d->accessibleAttached->setRole((QAccessible::Role)(d->accessibleRole));
    else
        qWarning() << "QQuickControl: QQuickAccessibleAttached object creation failed!";
#endif
}

void QQuickControl::mousePressEvent(QMouseEvent *event)
{
    event->accept();
}

void QQuickControl::mouseMoveEvent(QMouseEvent *event)
{
    event->accept();
}

void QQuickControl::mouseReleaseEvent(QMouseEvent *event)
{
    event->accept();
}

void QQuickControl::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
{
    Q_D(QQuickControl);
    QQuickItem::geometryChanged(newGeometry, oldGeometry);
    d->resizeBackground();
    d->resizeContent();
    if (newGeometry.width() != oldGeometry.width())
        emit availableWidthChanged();
    if (newGeometry.width() != oldGeometry.height())
        emit availableHeightChanged();
}

void QQuickControl::mirrorChange()
{
    emit effectiveLayoutDirectionChanged();
    emit mirroredChanged();
}

void QQuickControl::paddingChange(const QMarginsF &newPadding, const QMarginsF &oldPadding)
{
    Q_D(QQuickControl);
    Q_UNUSED(newPadding);
    Q_UNUSED(oldPadding);
    d->resizeContent();
}

void QQuickControl::contentItemChange(QQuickItem *newItem, QQuickItem *oldItem)
{
    Q_UNUSED(newItem);
    Q_UNUSED(oldItem);
}

QT_END_NAMESPACE