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Diffstat (limited to 'src/quicktemplates2/qquickscrollindicator.cpp')
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diff --git a/src/quicktemplates2/qquickscrollindicator.cpp b/src/quicktemplates2/qquickscrollindicator.cpp new file mode 100644 index 00000000..7d93215d --- /dev/null +++ b/src/quicktemplates2/qquickscrollindicator.cpp @@ -0,0 +1,511 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** 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 "qquickscrollindicator_p.h" +#include "qquickcontrol_p_p.h" + +#include <QtQml/qqmlinfo.h> +#include <QtQuick/private/qquickflickable_p.h> +#include <QtQuick/private/qquickitemchangelistener_p.h> + +QT_BEGIN_NAMESPACE + +/*! + \qmltype ScrollIndicator + \inherits Control + \instantiates QQuickScrollIndicator + \inqmlmodule QtQuick.Controls + \since 5.7 + \ingroup qtquickcontrols2-indicators + \brief Vertical or horizontal non-interactive scroll indicator. + + \image qtquickcontrols2-scrollindicator.gif + + ScrollIndicator is a non-interactive indicator that indicates the current scroll + position. A scroll indicator can be either \l vertical or \l horizontal, and can + be attached to any \l Flickable, such as \l ListView and \l GridView. + + \code + Flickable { + // ... + ScrollIndicator.vertical: ScrollIndicator { } + } + \endcode + + \section1 Attaching ScrollIndicator to a Flickable + + \note When ScrollIndicator is attached \l {ScrollIndicator::vertical}{vertically} + or \l {ScrollIndicator::horizontal}{horizontally} to a Flickable, its geometry and + the following properties are automatically set and updated as appropriate: + + \list + \li \l orientation + \li \l position + \li \l size + \li \l active + \endlist + + An attached ScrollIndicator re-parents itself to the target Flickable. A vertically + attached ScrollIndicator resizes itself to the height of the Flickable, and positions + itself to either side of it based on the \l {Control::mirrored}{layout direction}. + A horizontally attached ScrollIndicator resizes itself to the width of the Flickable, + and positions itself to the bottom. The automatic geometry management can be disabled + by specifying another parent for the attached ScrollIndicator. This can be useful, for + example, if the ScrollIndicator should be placed outside a clipping Flickable. This is + demonstrated by the following example: + + \code + Flickable { + id: flickable + clip: true + // ... + ScrollIndicator.vertical: ScrollIndicator { + parent: flickable.parent + anchors.top: flickable.top + anchors.left: flickable.right + anchors.bottom: flickable.bottom + } + } + \endcode + + \section1 Binding the Active State of Horizontal and Vertical Scroll Indicators + + Horizontal and vertical scroll indicators do not share the \l active state with + each other by default. In order to keep both indicators visible whilst scrolling + to either direction, establish a two-way binding between the active states as + presented by the following example: + + \snippet qtquickcontrols2-scrollindicator-active.qml 1 + + \section1 Non-attached Scroll Indicators + + It is possible to create an instance of ScrollIndicator without using the + attached property API. This is useful when the behavior of the attached + scoll indicator is not sufficient or a \l Flickable is not in use. In the + following example, horizontal and vertical scroll indicators are used to + indicate how far the user has scrolled over the text (using \l MouseArea + instead of \l Flickable): + + \snippet qtquickcontrols2-scrollindicator-non-attached.qml 1 + + \image qtquickcontrols2-scrollindicator-non-attached.png + + \sa ScrollBar, {Customizing ScrollIndicator}, {Indicator Controls} +*/ + +class QQuickScrollIndicatorPrivate : public QQuickControlPrivate +{ + Q_DECLARE_PUBLIC(QQuickScrollIndicator) + +public: + QQuickScrollIndicatorPrivate() : size(0), position(0), + active(false), orientation(Qt::Vertical) + { + } + + void resizeContent() override; + + qreal size; + qreal position; + bool active; + Qt::Orientation orientation; +}; + +void QQuickScrollIndicatorPrivate::resizeContent() +{ + Q_Q(QQuickScrollIndicator); + if (!contentItem) + return; + + // - negative overshoot (pos < 0): clamp the pos to 0, and deduct the overshoot from the size + // - positive overshoot (pos + size > 1): clamp the size to 1-pos + const qreal clampedSize = qBound<qreal>(0, size + qMin<qreal>(0, position), 1.0 - position); + const qreal clampedPos = qBound<qreal>(0, position, 1.0 - clampedSize); + + if (orientation == Qt::Horizontal) { + contentItem->setPosition(QPointF(q->leftPadding() + clampedPos * q->availableWidth(), q->topPadding())); + contentItem->setSize(QSizeF(q->availableWidth() * clampedSize, q->availableHeight())); + } else { + contentItem->setPosition(QPointF(q->leftPadding(), q->topPadding() + clampedPos * q->availableHeight())); + contentItem->setSize(QSizeF(q->availableWidth(), q->availableHeight() * clampedSize)); + } +} + +QQuickScrollIndicator::QQuickScrollIndicator(QQuickItem *parent) : + QQuickControl(*(new QQuickScrollIndicatorPrivate), parent) +{ +} + +QQuickScrollIndicatorAttached *QQuickScrollIndicator::qmlAttachedProperties(QObject *object) +{ + QQuickFlickable *flickable = qobject_cast<QQuickFlickable *>(object); + if (!flickable) + qmlInfo(object) << "ScrollIndicator must be attached to a Flickable"; + + return new QQuickScrollIndicatorAttached(flickable); +} + +/*! + \qmlproperty real QtQuick.Controls::ScrollIndicator::size + + This property holds the size of the indicator, scaled to \c {0.0 - 1.0}. + + \sa {Flickable::visibleArea.heightRatio}{Flickable::visibleArea} + + This property is automatically set when the scroll indicator is + \l {Attaching ScrollIndicator to a Flickable}{attached to a flickable}. +*/ +qreal QQuickScrollIndicator::size() const +{ + Q_D(const QQuickScrollIndicator); + return d->size; +} + +void QQuickScrollIndicator::setSize(qreal size) +{ + Q_D(QQuickScrollIndicator); + if (qFuzzyCompare(d->size, size)) + return; + + d->size = size; + if (isComponentComplete()) + d->resizeContent(); + emit sizeChanged(); +} + +/*! + \qmlproperty real QtQuick.Controls::ScrollIndicator::position + + This property holds the position of the indicator, scaled to \c {0.0 - 1.0}. + + This property is automatically set when the scroll indicator is + \l {Attaching ScrollIndicator to a Flickable}{attached to a flickable}. + + \sa {Flickable::visibleArea.yPosition}{Flickable::visibleArea} +*/ +qreal QQuickScrollIndicator::position() const +{ + Q_D(const QQuickScrollIndicator); + return d->position; +} + +void QQuickScrollIndicator::setPosition(qreal position) +{ + Q_D(QQuickScrollIndicator); + if (qFuzzyCompare(d->position, position)) + return; + + d->position = position; + if (isComponentComplete()) + d->resizeContent(); + emit positionChanged(); +} + +/*! + \qmlproperty bool QtQuick.Controls::ScrollIndicator::active + + This property holds whether the indicator is active, that is, when the + attached Flickable is \l {Flickable::moving}{moving}. + + It is possible to keep \l {Binding the Active State of Horizontal and Vertical Scroll Indicators} + {both horizontal and vertical indicators visible} while scrolling in either direction. + + This property is automatically set when the scroll indicator is + \l {Attaching ScrollIndicator to a Flickable}{attached to a flickable}. +*/ +bool QQuickScrollIndicator::isActive() const +{ + Q_D(const QQuickScrollIndicator); + return d->active; +} + +void QQuickScrollIndicator::setActive(bool active) +{ + Q_D(QQuickScrollIndicator); + if (d->active == active) + return; + + d->active = active; + emit activeChanged(); +} + +/*! + \qmlproperty enumeration QtQuick.Controls::ScrollIndicator::orientation + + This property holds the orientation of the indicator. + + Possible values: + \value Qt.Horizontal Horizontal + \value Qt.Vertical Vertical (default) + + This property is automatically set when the scroll indicator is + \l {Attaching ScrollIndicator to a Flickable}{attached to a flickable}. +*/ +Qt::Orientation QQuickScrollIndicator::orientation() const +{ + Q_D(const QQuickScrollIndicator); + return d->orientation; +} + +void QQuickScrollIndicator::setOrientation(Qt::Orientation orientation) +{ + Q_D(QQuickScrollIndicator); + if (d->orientation == orientation) + return; + + d->orientation = orientation; + if (isComponentComplete()) + d->resizeContent(); + emit orientationChanged(); +} + +class QQuickScrollIndicatorAttachedPrivate : public QObjectPrivate, public QQuickItemChangeListener +{ +public: + QQuickScrollIndicatorAttachedPrivate(QQuickFlickable *flickable) : flickable(flickable), horizontal(nullptr), vertical(nullptr) { } + + void activateHorizontal(); + void activateVertical(); + + void layoutHorizontal(bool move = true); + void layoutVertical(bool move = true); + + void itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry) override; + void itemDestroyed(QQuickItem *item) override; + + QQuickFlickable *flickable; + QQuickScrollIndicator *horizontal; + QQuickScrollIndicator *vertical; +}; + +void QQuickScrollIndicatorAttachedPrivate::activateHorizontal() +{ + horizontal->setActive(flickable->isMovingHorizontally()); +} + +void QQuickScrollIndicatorAttachedPrivate::activateVertical() +{ + vertical->setActive(flickable->isMovingVertically()); +} + +void QQuickScrollIndicatorAttachedPrivate::layoutHorizontal(bool move) +{ + Q_ASSERT(horizontal && flickable); + if (horizontal->parentItem() != flickable) + return; + horizontal->setWidth(flickable->width()); + if (move) + horizontal->setY(flickable->height() - horizontal->height()); +} + +void QQuickScrollIndicatorAttachedPrivate::layoutVertical(bool move) +{ + Q_ASSERT(vertical && flickable); + if (vertical->parentItem() != flickable) + return; + vertical->setHeight(flickable->height()); + if (move && !QQuickItemPrivate::get(vertical)->isMirrored()) + vertical->setX(flickable->width() - vertical->width()); +} + +void QQuickScrollIndicatorAttachedPrivate::itemGeometryChanged(QQuickItem *item, const QRectF &newGeometry, const QRectF &oldGeometry) +{ + Q_UNUSED(item); + Q_UNUSED(newGeometry); + if (horizontal && horizontal->height() > 0) { + bool move = qFuzzyIsNull(horizontal->y()) || qFuzzyCompare(horizontal->y(), oldGeometry.height() - horizontal->height()); + layoutHorizontal(move); + } + if (vertical && vertical->width() > 0) { + bool move = qFuzzyIsNull(vertical->x()) || qFuzzyCompare(vertical->x(), oldGeometry.width() - vertical->width()); + layoutVertical(move); + } +} + +void QQuickScrollIndicatorAttachedPrivate::itemDestroyed(QQuickItem *item) +{ + if (item == horizontal) + horizontal = nullptr; + if (item == vertical) + vertical = nullptr; +} + +QQuickScrollIndicatorAttached::QQuickScrollIndicatorAttached(QQuickFlickable *flickable) : + QObject(*(new QQuickScrollIndicatorAttachedPrivate(flickable)), flickable) +{ + Q_D(QQuickScrollIndicatorAttached); + if (flickable) { + QQuickItemPrivate *p = QQuickItemPrivate::get(flickable); + p->updateOrAddGeometryChangeListener(d, QQuickItemPrivate::SizeChange); + } +} + +QQuickScrollIndicatorAttached::~QQuickScrollIndicatorAttached() +{ + Q_D(QQuickScrollIndicatorAttached); + if (d->flickable) { + if (d->horizontal) + QQuickItemPrivate::get(d->horizontal)->removeItemChangeListener(d, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed); + if (d->vertical) + QQuickItemPrivate::get(d->vertical)->removeItemChangeListener(d,QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed); + QQuickItemPrivate::get(d->flickable)->removeItemChangeListener(d, QQuickItemPrivate::Geometry); + } +} + +/*! + \qmlattachedproperty ScrollIndicator QtQuick.Controls::ScrollIndicator::horizontal + + This property attaches a horizontal scroll indicator to a \l Flickable. + + \code + Flickable { + contentWidth: 2000 + ScrollIndicator.horizontal: ScrollIndicator { } + } + \endcode + + \sa {Attaching ScrollIndicator to a Flickable} +*/ +QQuickScrollIndicator *QQuickScrollIndicatorAttached::horizontal() const +{ + Q_D(const QQuickScrollIndicatorAttached); + return d->horizontal; +} + +void QQuickScrollIndicatorAttached::setHorizontal(QQuickScrollIndicator *horizontal) +{ + Q_D(QQuickScrollIndicatorAttached); + if (d->horizontal == horizontal) + return; + + if (d->horizontal && d->flickable) { + QQuickItemPrivate::get(d->horizontal)->removeItemChangeListener(d, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed); + QObjectPrivate::disconnect(d->flickable, &QQuickFlickable::movingHorizontallyChanged, d, &QQuickScrollIndicatorAttachedPrivate::activateHorizontal); + + // TODO: export QQuickFlickableVisibleArea + QObject *area = d->flickable->property("visibleArea").value<QObject *>(); + disconnect(area, SIGNAL(widthRatioChanged(qreal)), d->horizontal, SLOT(setSize(qreal))); + disconnect(area, SIGNAL(xPositionChanged(qreal)), d->horizontal, SLOT(setPosition(qreal))); + } + + d->horizontal = horizontal; + + if (horizontal && d->flickable) { + if (!horizontal->parentItem()) + horizontal->setParentItem(d->flickable); + horizontal->setOrientation(Qt::Horizontal); + + QQuickItemPrivate::get(horizontal)->addItemChangeListener(d, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed); + QObjectPrivate::connect(d->flickable, &QQuickFlickable::movingHorizontallyChanged, d, &QQuickScrollIndicatorAttachedPrivate::activateHorizontal); + + // TODO: export QQuickFlickableVisibleArea + QObject *area = d->flickable->property("visibleArea").value<QObject *>(); + connect(area, SIGNAL(widthRatioChanged(qreal)), horizontal, SLOT(setSize(qreal))); + connect(area, SIGNAL(xPositionChanged(qreal)), horizontal, SLOT(setPosition(qreal))); + + d->layoutHorizontal(); + horizontal->setSize(area->property("widthRatio").toReal()); + horizontal->setPosition(area->property("xPosition").toReal()); + } + emit horizontalChanged(); +} + +/*! + \qmlattachedproperty ScrollIndicator QtQuick.Controls::ScrollIndicator::vertical + + This property attaches a vertical scroll indicator to a \l Flickable. + + \code + Flickable { + contentHeight: 2000 + ScrollIndicator.vertical: ScrollIndicator { } + } + \endcode + + \sa {Attaching ScrollIndicator to a Flickable} +*/ +QQuickScrollIndicator *QQuickScrollIndicatorAttached::vertical() const +{ + Q_D(const QQuickScrollIndicatorAttached); + return d->vertical; +} + +void QQuickScrollIndicatorAttached::setVertical(QQuickScrollIndicator *vertical) +{ + Q_D(QQuickScrollIndicatorAttached); + if (d->vertical == vertical) + return; + + if (d->vertical && d->flickable) { + QQuickItemPrivate::get(d->vertical)->removeItemChangeListener(d, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed); + QObjectPrivate::disconnect(d->flickable, &QQuickFlickable::movingVerticallyChanged, d, &QQuickScrollIndicatorAttachedPrivate::activateVertical); + + // TODO: export QQuickFlickableVisibleArea + QObject *area = d->flickable->property("visibleArea").value<QObject *>(); + disconnect(area, SIGNAL(heightRatioChanged(qreal)), d->vertical, SLOT(setSize(qreal))); + disconnect(area, SIGNAL(yPositionChanged(qreal)), d->vertical, SLOT(setPosition(qreal))); + } + + d->vertical = vertical; + + if (vertical && d->flickable) { + if (!vertical->parentItem()) + vertical->setParentItem(d->flickable); + vertical->setOrientation(Qt::Vertical); + + QQuickItemPrivate::get(vertical)->addItemChangeListener(d, QQuickItemPrivate::Geometry | QQuickItemPrivate::Destroyed); + QObjectPrivate::connect(d->flickable, &QQuickFlickable::movingVerticallyChanged, d, &QQuickScrollIndicatorAttachedPrivate::activateVertical); + + // TODO: export QQuickFlickableVisibleArea + QObject *area = d->flickable->property("visibleArea").value<QObject *>(); + connect(area, SIGNAL(heightRatioChanged(qreal)), vertical, SLOT(setSize(qreal))); + connect(area, SIGNAL(yPositionChanged(qreal)), vertical, SLOT(setPosition(qreal))); + + d->layoutVertical(); + vertical->setSize(area->property("heightRatio").toReal()); + vertical->setPosition(area->property("yPosition").toReal()); + } + emit verticalChanged(); +} + +#ifndef QT_NO_ACCESSIBILITY +QAccessible::Role QQuickScrollIndicator::accessibleRole() const +{ + return QAccessible::Indicator; +} +#endif + +QT_END_NAMESPACE |