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Diffstat (limited to 'src/quicktemplates/qquickstackview.cpp')
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diff --git a/src/quicktemplates/qquickstackview.cpp b/src/quicktemplates/qquickstackview.cpp new file mode 100644 index 0000000000..2e0109863a --- /dev/null +++ b/src/quicktemplates/qquickstackview.cpp @@ -0,0 +1,1861 @@ +// Copyright (C) 2017 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only + +#include "qquickstackview_p.h" +#include "qquickstackview_p_p.h" +#include "qquickstackelement_p_p.h" +#if QT_CONFIG(quick_viewtransitions) +#include "qquickstacktransition_p_p.h" +#endif + +#include <QtCore/qscopedvaluerollback.h> +#include <QtQml/qjsvalue.h> +#include <QtQml/qqmlengine.h> +#include <QtQml/qqmlinfo.h> + +#include <private/qv4qobjectwrapper_p.h> +#include <private/qqmlengine_p.h> + +QT_BEGIN_NAMESPACE + +QQuickStackViewArg::QQuickStackViewArg(QQuickItem *item) + : mItem(item) +{ +} + +QQuickStackViewArg::QQuickStackViewArg(const QUrl &url) + : mUrl(url) +{ +} + +QQuickStackViewArg::QQuickStackViewArg(QQmlComponent *component) + : mComponent(component) +{ +} + +QQuickStackViewArg::QQuickStackViewArg(const QVariantMap &properties) + : mProperties(properties) +{ +} + +#ifndef QT_NO_DEBUG_STREAM +QDebug operator<<(QDebug debug, const QQuickStackViewArg &arg) +{ + QDebugStateSaver saver(debug); + debug.nospace() << "QQuickStackViewArg(" + << "mItem=" << arg.mItem + << " mComponent=" << arg.mComponent + << " mUrl=" << arg.mUrl + << ")"; + return debug; +} +#endif + +/*! + \qmltype StackView + \inherits Control +//! \instantiates QQuickStackView + \inqmlmodule QtQuick.Controls + \since 5.7 + \ingroup qtquickcontrols-navigation + \ingroup qtquickcontrols-containers + \ingroup qtquickcontrols-focusscopes + \brief Provides a stack-based navigation model. + + \image qtquickcontrols-stackview-wireframe.png + + StackView can be used with a set of inter-linked information pages. For + example, an email application with separate views to list the latest emails, + view a specific email, and list/view the attachments. The email list view + is pushed onto the stack as users open an email, and popped out as they + choose to go back. + + The following snippet demonstrates a simple use case, where the \c mainView + is pushed onto and popped out of the stack on relevant button click: + + \qml + ApplicationWindow { + title: qsTr("Hello World") + width: 640 + height: 480 + visible: true + + StackView { + id: stack + initialItem: mainView + anchors.fill: parent + } + + Component { + id: mainView + + Row { + spacing: 10 + + Button { + text: "Push" + onClicked: stack.push(mainView) + } + Button { + text: "Pop" + enabled: stack.depth > 1 + onClicked: stack.pop() + + } + Text { + text: stack.depth + } + } + } + } + \endqml + + \section1 Using StackView in an Application + + Using StackView in an application is as simple as adding it as a child to + a Window. The stack is usually anchored to the edges of the window, except + at the top or bottom where it might be anchored to a status bar, or some + other similar UI component. The stack can then be used by invoking its + navigation methods. The first item to show in the StackView is the one + that was assigned to \l initialItem, or the topmost item if \l initialItem + is not set. + + \section1 Basic Navigation + + StackView supports three primary navigation operations: push(), pop(), and + replace(). These correspond to classic stack operations where "push" adds + an item to the top of a stack, "pop" removes the top item from the + stack, and "replace" is like a pop followed by a push, which replaces the + topmost item with the new item. The topmost item in the stack + corresponds to the one that is \l{StackView::currentItem}{currently} + visible on screen. Logically, "push" navigates forward or deeper into the + application UI, "pop" navigates backward, and "replace" replaces the + \l currentItem. + + \section2 Pushing Items + + In the following animation, three \l Label controls are pushed onto a + stack view with the \l push() function: + + \image qtquickcontrols-stackview-push.gif + + The stack now contains the following items: \c [A, B, C]. + + \note When the stack is empty, a push() operation will not have a + transition animation because there is nothing to transition from (typically + on application start-up). + + \section2 Popping Items + + Continuing on from the example above, the topmost item on the stack is + removed with a call to \l pop(): + + \image qtquickcontrols-stackview-pop.gif + + The stack now contains the following items: \c [A, B]. + + \note A pop() operation on a stack with depth 1 or 0 does nothing. In such + cases, the stack can be emptied using the \l clear() method. + + \section3 Unwinding Items via Pop + + Sometimes, it is necessary to go back more than a single step in the stack. + For example, to return to a "main" item or some kind of section item in the + application. In such cases, it is possible to specify an item as a + parameter for pop(). This is called an "unwind" operation, where the stack + unwinds till the specified item. If the item is not found, stack unwinds + until it is left with one item, which becomes the \l currentItem. To + explicitly unwind to the bottom of the stack, it is recommended to use + \l{pop()}{pop(null)}, although any non-existent item will do. + + In the following animation, we unwind the stack to the first item by + calling \c pop(null): + + \image qtquickcontrols-stackview-unwind.gif + + The stack now contains a single item: \c [A]. + + \section2 Replacing Items + + In the following animation, we \l replace the topmost item with \c D: + + \image qtquickcontrols-stackview-replace.gif + + The stack now contains the following items: \c [A, B, D]. + + \section1 Deep Linking + + \e{Deep linking} means launching an application into a particular state. For + example, a newspaper application could be launched into showing a + particular article, bypassing the topmost item. In terms of StackView, deep + linking means the ability to modify the state of the stack, so much so that + it is possible to push a set of items to the top of the stack, or to + completely reset the stack to a given state. + + The API for deep linking in StackView is the same as for basic navigation. + Pushing an array instead of a single item adds all the items in that array + to the stack. The transition animation, however, is applied only for the + last item in the array. The normal semantics of push() apply for deep + linking, that is, it adds whatever is pushed onto the stack. + + \note Only the last item of the array is loaded. The rest of the items are + loaded only when needed, either on subsequent calls to pop or on request to + get an item using get(). + + This gives us the following result, given the stack [A, B, C]: + + \list + \li \l{push()}{push([D, E, F])} => [A, B, C, D, E, F] - "push" transition + animation between C and F + \li \l{replace()}{replace([D, E, F])} => [A, B, D, E, F] - "replace" + transition animation between C and F + \li \l{clear()} followed by \l{push()}{push([D, E, F])} => [D, E, F] - no + transition animation for pushing items as the stack was empty. + \endlist + + \section1 Finding Items + + An Item for which the application does not have a reference can be found + by calling find(). The method needs a callback function, which is invoked + for each item in the stack (starting at the top) until a match is found. + If the callback returns \c true, find() stops and returns the matching + item, otherwise \c null is returned. + + The code below searches the stack for an item named "order_id" and unwinds + to that item. + + \badcode + stackView.pop(stackView.find(function(item) { + return item.name == "order_id"; + })); + \endcode + + You can also get to an item in the stack using \l {get()}{get(index)}. + + \badcode + previousItem = stackView.get(myItem.StackView.index - 1)); + \endcode + + \section1 Transitions + + For each push or pop operation, different transition animations are applied + to entering and exiting items. These animations define how the entering item + should animate in, and the exiting item should animate out. The animations + can be customized by assigning different \l [QML] {Transition} {Transitions} + for the \l pushEnter, \l pushExit, \l popEnter, \l popExit, replaceEnter, + and \l replaceExit properties of StackView. + + \note The transition animations affect each others' transitional behavior. + Customizing the animation for one and leaving the other may give unexpected + results. + + The following snippet defines a simple fade transition for push and pop + operations: + + \qml + StackView { + id: stackview + anchors.fill: parent + + pushEnter: Transition { + PropertyAnimation { + property: "opacity" + from: 0 + to:1 + duration: 200 + } + } + pushExit: Transition { + PropertyAnimation { + property: "opacity" + from: 1 + to:0 + duration: 200 + } + } + popEnter: Transition { + PropertyAnimation { + property: "opacity" + from: 0 + to:1 + duration: 200 + } + } + popExit: Transition { + PropertyAnimation { + property: "opacity" + from: 1 + to:0 + duration: 200 + } + } + } + \endqml + + \note Using anchors on the items added to a StackView is not supported. + Typically push, pop, and replace transitions animate the position, + which is not possible when anchors are applied. Notice that this + only applies to the root of the item. Using anchors for its children + works as expected. + + \section1 Item Ownership + + StackView only takes ownership of items that it creates itself. This means + that any item pushed onto a StackView will never be destroyed by the + StackView; only items that StackView creates from \l {Component}{Components} + or \l [QML] {url}{URLs} are destroyed by the StackView. To illustrate this, + the messages in the example below will only be printed when the StackView + is destroyed, not when the items are popped off the stack: + + \qml + Component { + id: itemComponent + + Item { + Component.onDestruction: print("Destroying second item") + } + } + + StackView { + initialItem: Item { + Component.onDestruction: print("Destroying initial item") + } + + Component.onCompleted: push(itemComponent.createObject(window)) + } + \endqml + + However, both of the items created from the URL and Component in the + following example will be destroyed by the StackView when they are popped + off of it: + + \qml + Component { + id: itemComponent + + Item { + Component.onDestruction: print("Destroying second item") + } + } + + StackView { + initialItem: "Item1.qml" + + Component.onCompleted: push(itemComponent) + } + \endqml + + \section1 Size + + StackView does not inherit an implicit size from items that are pushed onto + it. This means that using it as the \l {Popup::}{contentItem} of a + \l Dialog, for example, will not work as expected: + + \code + Dialog { + StackView { + initialItem: Rectangle { + width: 200 + height: 200 + color: "salmon" + } + } + } + \endcode + + There are several ways to ensure that StackView has a size in this + situation: + + \list + \li Set \l[QtQuick]{Item::}{implicitWidth} and + \l[QtQuick]{Item::}{implicitHeight} on the StackView itself. + \li Set \l[QtQuick]{Item::}{implicitWidth} and + \l[QtQuick]{Item::}{implicitHeight} on the \l Rectangle. + \li Set \l {Popup::}{contentWidth} and \l {Popup::}{contentHeight} on + the Dialog. + \li Give the Dialog a size. + \endlist + + \sa {Customizing StackView}, {Navigating with StackView}, {Navigation Controls}, + {Container Controls}, {Focus Management in Qt Quick Controls} +*/ + +QQuickStackView::QQuickStackView(QQuickItem *parent) + : QQuickControl(*(new QQuickStackViewPrivate), parent) +{ + setFlag(ItemIsFocusScope); + + Q_D(QQuickStackView); + d->setSizePolicy(QLayoutPolicy::Preferred, QLayoutPolicy::Preferred); +} + +QQuickStackView::~QQuickStackView() +{ + Q_D(QQuickStackView); +#if QT_CONFIG(quick_viewtransitions) + if (d->transitioner) { + d->transitioner->setChangeListener(nullptr); + delete d->transitioner; + } +#endif + qDeleteAll(d->removing); + qDeleteAll(d->removed); + qDeleteAll(d->elements); +} + +QQuickStackViewAttached *QQuickStackView::qmlAttachedProperties(QObject *object) +{ + return new QQuickStackViewAttached(object); +} + +/*! + \qmlproperty bool QtQuick.Controls::StackView::busy + \readonly + This property holds whether a transition is running. +*/ +bool QQuickStackView::isBusy() const +{ + Q_D(const QQuickStackView); + return d->busy; +} + +/*! + \qmlproperty int QtQuick.Controls::StackView::depth + \readonly + This property holds the number of items currently pushed onto the stack. +*/ +int QQuickStackView::depth() const +{ + Q_D(const QQuickStackView); + return d->elements.size(); +} + +/*! + \qmlproperty Item QtQuick.Controls::StackView::currentItem + \readonly + This property holds the current top-most item in the stack. +*/ +QQuickItem *QQuickStackView::currentItem() const +{ + Q_D(const QQuickStackView); + return d->currentItem; +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::get(index, behavior) + + Returns the item at position \a index in the stack, or \c null if the index + is out of bounds. + + Supported \a behavior values: + \value StackView.DontLoad The item is not forced to load (and \c null is returned if not yet loaded). + \value StackView.ForceLoad The item is forced to load. +*/ +QQuickItem *QQuickStackView::get(int index, LoadBehavior behavior) +{ + Q_D(QQuickStackView); + QQuickStackElement *element = d->elements.value(index); + if (element) { + if (behavior == ForceLoad) + element->load(this); + return element->item; + } + return nullptr; +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::find(callback, behavior) + + Search for a specific item inside the stack. The \a callback function is called + for each item in the stack (with the item and index as arguments) until the callback + function returns \c true. The return value is the item found. For example: + + \code + stackView.find(function(item, index) { + return item.isTheOne + }) + \endcode + + Supported \a behavior values: + \value StackView.DontLoad Unloaded items are skipped (the callback function is not called for them). + \value StackView.ForceLoad Unloaded items are forced to load. +*/ +QQuickItem *QQuickStackView::find(const QJSValue &callback, LoadBehavior behavior) +{ + Q_D(QQuickStackView); + QJSValue func(callback); + QQmlEngine *engine = qmlEngine(this); + if (!engine || !func.isCallable()) // TODO: warning? + return nullptr; + + for (int i = d->elements.size() - 1; i >= 0; --i) { + QQuickStackElement *element = d->elements.at(i); + if (behavior == ForceLoad) + element->load(this); + if (element->item) { + QJSValue rv = func.call(QJSValueList() << engine->newQObject(element->item) << i); + if (rv.toBool()) + return element->item; + } + } + + return nullptr; +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::push(item, properties, operation) + + Pushes an \a item onto the stack using an optional \a operation, and + optionally applies a set of \a properties on the item. The item can be + an \l Item, \l Component, or a \l [QML] url. Returns the item that became + current. + + StackView creates an instance automatically if the pushed item is a \l Component, + or a \l [QML] url, and the instance will be destroyed when it is popped + off the stack. See \l {Item Ownership} for more information. + + The optional \a properties argument specifies a map of initial + property values for the pushed item. For dynamically created items, these values + are applied before the creation is finalized. This is more efficient than setting + property values after creation, particularly where large sets of property values + are defined, and also allows property bindings to be set up (using \l{Qt::binding} + {Qt.binding()}) before the item is created. + + Pushing a single item: + \code + stackView.push(rect) + + // or with properties: + stackView.push(rect, {"color": "red"}) + \endcode + + Multiple items can be pushed at the same time either by passing them as + additional arguments, or as an array. The last item becomes the current + item. Each item can be followed by a set of properties to apply. + + Passing a variable amount of arguments: + \code + stackView.push(rect1, rect2, rect3) + + // or with properties: + stackView.push(rect1, {"color": "red"}, rect2, {"color": "green"}, rect3, {"color": "blue"}) + \endcode + + Pushing an array of items: + \code + stackView.push([rect1, rect2, rect3]) + + // or with properties: + stackView.push([rect1, {"color": "red"}, rect2, {"color": "green"}, rect3, {"color": "blue"}]) + \endcode + + An \a operation can be optionally specified as the last argument. Supported + operations: + + \value StackView.Immediate An immediate operation without transitions. + \value StackView.PushTransition An operation with push transitions (since QtQuick.Controls 2.1). + \value StackView.ReplaceTransition An operation with replace transitions (since QtQuick.Controls 2.1). + \value StackView.PopTransition An operation with pop transitions (since QtQuick.Controls 2.1). + + If no operation is provided, \c Immediate will be used if the stack is + empty, and \c PushTransition otherwise. + + \note Items that already exist in the stack are not pushed. + + \note If you are \l {The QML script compiler}{compiling QML}, use the + strongly-typed \l pushItem or \l pushItems functions instead. + + \sa initialItem, {Pushing Items} +*/ +void QQuickStackView::push(QQmlV4FunctionPtr args) +{ + Q_D(QQuickStackView); + const QString operationName = QStringLiteral("push"); + if (d->modifyingElements) { + d->warnOfInterruption(operationName); + return; + } + + QScopedValueRollback<bool> modifyingElements(d->modifyingElements, true); + QScopedValueRollback<QString> operationNameRollback(d->operation, operationName); + if (args->length() <= 0) { + d->warn(QStringLiteral("missing arguments")); + args->setReturnValue(QV4::Encode::null()); + return; + } + + QV4::ExecutionEngine *v4 = args->v4engine(); + QV4::Scope scope(v4); + +#if QT_CONFIG(quick_viewtransitions) + Operation operation = d->elements.isEmpty() ? Immediate : PushTransition; + QV4::ScopedValue lastArg(scope, (*args)[args->length() - 1]); + if (lastArg->isInt32()) + operation = static_cast<Operation>(lastArg->toInt32()); +#endif + + QStringList errors; + QList<QQuickStackElement *> elements = d->parseElements(0, args, &errors); + // Remove any items that are already in the stack, as they can't be in two places at once. + // not using erase_if, as we have to delete the elements first + auto removeIt = std::remove_if(elements.begin(), elements.end(), [&](QQuickStackElement *element) { + return element->item && d->findElement(element->item); + }); + for (auto it = removeIt, end = elements.end(); it != end; ++it) + delete *it; + elements.erase(removeIt, elements.end()); + + if (!errors.isEmpty() || elements.isEmpty()) { + if (!errors.isEmpty()) { + for (const QString &error : std::as_const(errors)) + d->warn(error); + } else { + d->warn(QStringLiteral("nothing to push")); + } + args->setReturnValue(QV4::Encode::null()); + return; + } + +#if QT_CONFIG(quick_viewtransitions) + QQuickStackElement *exit = nullptr; + if (!d->elements.isEmpty()) + exit = d->elements.top(); +#endif + + int oldDepth = d->elements.size(); + if (d->pushElements(elements)) { + d->depthChange(d->elements.size(), oldDepth); + QQuickStackElement *enter = d->elements.top(); +#if QT_CONFIG(quick_viewtransitions) + d->startTransition(QQuickStackTransition::pushEnter(operation, enter, this), + QQuickStackTransition::pushExit(operation, exit, this), + operation == Immediate); +#endif + d->setCurrentItem(enter); + } + + if (d->currentItem) { + QV4::ScopedValue rv(scope, QV4::QObjectWrapper::wrap(v4, d->currentItem)); + args->setReturnValue(rv->asReturnedValue()); + } else { + args->setReturnValue(QV4::Encode::null()); + } +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::pop(item, operation) + + Pops one or more items off the stack. Returns the last item removed from the stack. + + If the \a item argument is specified, all items down to (but not + including) \a item will be popped. If \a item is \c null, all + items down to (but not including) the first item is popped. + If not specified, only the current item is popped. + + \note A pop() operation on a stack with depth 1 or 0 does nothing. In such + cases, the stack can be emptied using the \l clear() method. + + \include qquickstackview.qdocinc pop-ownership + + An \a operation can be optionally specified as the last argument. Supported + operations: + + \value StackView.Immediate An immediate operation without transitions. + \value StackView.PushTransition An operation with push transitions (since QtQuick.Controls 2.1). + \value StackView.ReplaceTransition An operation with replace transitions (since QtQuick.Controls 2.1). + \value StackView.PopTransition An operation with pop transitions (since QtQuick.Controls 2.1). + + If no operation is provided, \c PopTransition will be used. + + Examples: + \code + stackView.pop() + stackView.pop(someItem, StackView.Immediate) + stackView.pop(StackView.Immediate) + stackView.pop(null) + \endcode + + \note If you are \l {The QML script compiler}{compiling QML}, use the + strongly-typed \l popToItem, \l popToIndex or \l popCurrentItem functions + instead. + + \sa clear(), {Popping Items}, {Unwinding Items via Pop} +*/ +void QQuickStackView::pop(QQmlV4FunctionPtr args) +{ + Q_D(QQuickStackView); + const QString operationName = QStringLiteral("pop"); + if (d->modifyingElements) { + d->warnOfInterruption(operationName); + args->setReturnValue(QV4::Encode::null()); + return; + } + + QScopedValueRollback<bool> modifyingElements(d->modifyingElements, true); + QScopedValueRollback<QString> operationNameRollback(d->operation, operationName); + int argc = args->length(); + if (d->elements.size() <= 1 || argc > 2) { + if (argc > 2) + d->warn(QStringLiteral("too many arguments")); + args->setReturnValue(QV4::Encode::null()); + return; + } + + int oldDepth = d->elements.size(); + QQuickStackElement *exit = d->elements.pop(); + QQuickStackElement *enter = d->elements.top(); + + QV4::ExecutionEngine *v4 = args->v4engine(); + QV4::Scope scope(v4); + + if (argc > 0) { + QV4::ScopedValue value(scope, (*args)[0]); + if (value->isNull()) { + enter = d->elements.value(0); + } else if (const QV4::QObjectWrapper *o = value->as<QV4::QObjectWrapper>()) { + QQuickItem *item = qobject_cast<QQuickItem *>(o->object()); + enter = d->findElement(item); + if (!enter) { + if (item != d->currentItem) + d->warn(QStringLiteral("can't find item to pop: ") + value->toQString()); + args->setReturnValue(QV4::Encode::null()); + d->elements.push(exit); // restore + return; + } + } + } + +#if QT_CONFIG(quick_viewtransitions) + Operation operation = PopTransition; + if (argc > 0) { + QV4::ScopedValue lastArg(scope, (*args)[argc - 1]); + if (lastArg->isInt32()) + operation = static_cast<Operation>(lastArg->toInt32()); + } +#endif + + QPointer<QQuickItem> previousItem; + + if (d->popElements(enter)) { + if (exit) { + exit->removal = true; + d->removing.insert(exit); + previousItem = exit->item; + } + d->depthChange(d->elements.size(), oldDepth); +#if QT_CONFIG(quick_viewtransitions) + d->startTransition(QQuickStackTransition::popExit(operation, exit, this), + QQuickStackTransition::popEnter(operation, enter, this), + operation == Immediate); +#endif + d->setCurrentItem(enter); + } + + if (previousItem) { + QV4::ScopedValue rv(scope, QV4::QObjectWrapper::wrap(v4, previousItem)); + args->setReturnValue(rv->asReturnedValue()); + } else { + args->setReturnValue(QV4::Encode::null()); + } +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::replace(target, item, properties, operation) + + Replaces one or more items on the stack with the specified \a item and + optional \a operation, and optionally applies a set of \a properties on the + item. The item can be an \l Item, \l Component, or a \l [QML] url. + Returns the item that became current. + + \include qquickstackview.qdocinc pop-ownership + + If the \a target argument is specified, all items down to the \a target + item will be replaced. If \a target is \c null, all items in the stack + will be replaced. If not specified, only the top item will be replaced. + + StackView creates an instance automatically if the replacing item is a \l Component, + or a \l [QML] url. The optional \a properties argument specifies a map of initial + property values for the replacing item. For dynamically created items, these values + are applied before the creation is finalized. This is more efficient than setting + property values after creation, particularly where large sets of property values + are defined, and also allows property bindings to be set up (using \l{Qt::binding} + {Qt.binding()}) before the item is created. + + Replace the top item: + \code + stackView.replace(rect) + + // or with properties: + stackView.replace(rect, {"color": "red"}) + \endcode + + Multiple items can be replaced at the same time either by passing them as + additional arguments, or as an array. Each item can be followed by a set + of properties to apply. + + Passing a variable amount of arguments: + \code + stackView.replace(rect1, rect2, rect3) + + // or with properties: + stackView.replace(rect1, {"color": "red"}, rect2, {"color": "green"}, rect3, {"color": "blue"}) + \endcode + + Replacing an array of items: + \code + stackView.replace([rect1, rect2, rect3]) + + // or with properties: + stackView.replace([rect1, {"color": "red"}, rect2, {"color": "green"}, rect3, {"color": "blue"}]) + \endcode + + An \a operation can be optionally specified as the last argument. Supported + operations: + + \value StackView.Immediate An immediate operation without transitions. + \value StackView.PushTransition An operation with push transitions (since QtQuick.Controls 2.1). + \value StackView.ReplaceTransition An operation with replace transitions (since QtQuick.Controls 2.1). + \value StackView.PopTransition An operation with pop transitions (since QtQuick.Controls 2.1). + + If no operation is provided, \c Immediate will be used if the stack is + empty, and \c ReplaceTransition otherwise. + + The following example illustrates the use of push and pop transitions with replace(). + + \code + StackView { + id: stackView + + initialItem: Component { + id: page + + Page { + Row { + spacing: 20 + anchors.centerIn: parent + + Button { + text: "<" + onClicked: stackView.replace(page, StackView.PopTransition) + } + Button { + text: ">" + onClicked: stackView.replace(page, StackView.PushTransition) + } + } + } + } + } + \endcode + + \note If you are \l {The QML script compiler}{compiling QML}, use the + strongly-typed \l replaceCurrentItem functions instead. + + \sa push(), {Replacing Items} +*/ +void QQuickStackView::replace(QQmlV4FunctionPtr args) +{ + Q_D(QQuickStackView); + const QString operationName = QStringLiteral("replace"); + if (d->modifyingElements) { + d->warnOfInterruption(operationName); + args->setReturnValue(QV4::Encode::null()); + return; + } + + QScopedValueRollback<bool> modifyingElements(d->modifyingElements, true); + QScopedValueRollback<QString> operationNameRollback(d->operation, operationName); + if (args->length() <= 0) { + d->warn(QStringLiteral("missing arguments")); + args->setReturnValue(QV4::Encode::null()); + return; + } + + QV4::ExecutionEngine *v4 = args->v4engine(); + QV4::Scope scope(v4); + +#if QT_CONFIG(quick_viewtransitions) + Operation operation = d->elements.isEmpty() ? Immediate : ReplaceTransition; + QV4::ScopedValue lastArg(scope, (*args)[args->length() - 1]); + if (lastArg->isInt32()) + operation = static_cast<Operation>(lastArg->toInt32()); +#endif + + QQuickStackElement *target = nullptr; + QV4::ScopedValue firstArg(scope, (*args)[0]); + if (firstArg->isNull()) + target = d->elements.value(0); + else if (!firstArg->isInt32()) + target = d->findElement(firstArg); + + QStringList errors; + QList<QQuickStackElement *> elements = d->parseElements(target ? 1 : 0, args, &errors); + if (!errors.isEmpty() || elements.isEmpty()) { + if (!errors.isEmpty()) { + for (const QString &error : std::as_const(errors)) + d->warn(error); + } else { + d->warn(QStringLiteral("nothing to push")); + } + args->setReturnValue(QV4::Encode::null()); + return; + } + + int oldDepth = d->elements.size(); + QQuickStackElement* exit = nullptr; + if (!d->elements.isEmpty()) + exit = d->elements.pop(); + + if (exit != target ? d->replaceElements(target, elements) : d->pushElements(elements)) { + d->depthChange(d->elements.size(), oldDepth); + if (exit) { + exit->removal = true; + d->removing.insert(exit); + } + QQuickStackElement *enter = d->elements.top(); +#if QT_CONFIG(quick_viewtransitions) + d->startTransition(QQuickStackTransition::replaceExit(operation, exit, this), + QQuickStackTransition::replaceEnter(operation, enter, this), + operation == Immediate); +#endif + d->setCurrentItem(enter); + } + + if (d->currentItem) { + QV4::ScopedValue rv(scope, QV4::QObjectWrapper::wrap(v4, d->currentItem)); + args->setReturnValue(rv->asReturnedValue()); + } else { + args->setReturnValue(QV4::Encode::null()); + } +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::pushItems(items, operation) + \since 6.7 + + Pushes \a items onto the stack using an optional \a operation, and + optionally applies a set of properties on each element. \a items is an array + of elements. Each element can be + an \l Item, \l Component, or \l [QML] url and can be followed by an optional + properties argument (see below). Returns the item that became + current (the last item). + + StackView creates an instance automatically if the pushed element is a + \l Component or \l [QML] url, and the instance will be destroyed when it is + popped off the stack. See \l {Item Ownership} for more information. + + \include qquickstackview.qdocinc optional-properties-after-each-item + + \code + stackView.push([item, rectComponent, Qt.resolvedUrl("MyItem.qml")]) + + // With properties: + stackView.pushItems([ + item, { "color": "red" }, + rectComponent, { "color": "green" }, + Qt.resolvedUrl("MyItem.qml"), { "color": "blue" } + ]) + + // With properties for only some items: + stackView.pushItems([ + item, { "color": "yellow" }, + rectComponent + ]) + \endcode + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PushTransition will be used. + + To push a single item, use the relevant \c pushItem function: + \list + \li \l {stackview-pushitem-item-overload} + {pushItem}(item, properties, operation) + \li \l {stackview-pushitem-component-overload} + {pushItem}(component, properties, operation) + \li \l {stackview-pushitem-url-overload} + {pushItem}(url, properties, operation) + \endlist + + \note Items that already exist in the stack are not pushed. + + \sa initialItem, pushItem, {Pushing Items} +*/ +QQuickItem *QQuickStackView::pushItems(QList<QQuickStackViewArg> args, Operation operation) +{ + Q_D(QQuickStackView); + const QString operationName = QStringLiteral("pushItem"); + if (d->modifyingElements) { + d->warnOfInterruption(operationName); + return nullptr; + } + + QScopedValueRollback<bool> modifyingElements(d->modifyingElements, true); + QScopedValueRollback<QString> operationNameRollback(d->operation, operationName); + + const QList<QQuickStackElement *> stackElements = d->parseElements(args); + +#if QT_CONFIG(quick_viewtransitions) + QQuickStackElement *exit = nullptr; + if (!d->elements.isEmpty()) + exit = d->elements.top(); +#endif + + const int oldDepth = d->elements.size(); + if (d->pushElements(stackElements)) { + d->depthChange(d->elements.size(), oldDepth); + QQuickStackElement *enter = d->elements.top(); +#if QT_CONFIG(quick_viewtransitions) + d->startTransition(QQuickStackTransition::pushEnter(operation, enter, this), + QQuickStackTransition::pushExit(operation, exit, this), + operation == Immediate); +#endif + d->setCurrentItem(enter); + } + + return d->currentItem; +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::pushItem(item, properties, operation) + \keyword stackview-pushitem-item-overload + \since 6.7 + + Pushes an \a item onto the stack, optionally applying a set of + \a properties, using the optional \a operation. Returns the item that + became current (the last item). + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PushTransition will be used. + + To push several items onto the stack, use \l pushItems(). + + \sa initialItem, {Pushing Items} +*/ +QQuickItem *QQuickStackView::pushItem(QQuickItem *item, const QVariantMap &properties, Operation operation) +{ + return pushItems({ item, properties }, operation); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::pushItem(component, properties, operation) + \overload pushItem() + \keyword stackview-pushitem-component-overload + \since 6.7 + + Pushes a \a component onto the stack, optionally applying a set of + \a properties, using the optional \a operation. Returns the item that + became current (the last item). + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PushTransition will be used. + + To push several items onto the stack, use \l pushItems(). + + \sa initialItem, {Pushing Items} +*/ +QQuickItem *QQuickStackView::pushItem(QQmlComponent *component, const QVariantMap &properties, Operation operation) +{ + return pushItems({ component, properties }, operation); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::pushItem(url, properties, operation) + \overload pushItem() + \keyword stackview-pushitem-url-overload + \since 6.7 + + Pushes a \a url onto the stack, optionally applying a set of + \a properties, using the optional \a operation. Returns the item that + became current (the last item). + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PushTransition will be used. + + To push several items onto the stack, use \l pushItems(). + + \sa initialItem, {Pushing Items} +*/ +QQuickItem *QQuickStackView::pushItem(const QUrl &url, const QVariantMap &properties, Operation operation) +{ + return pushItems({ url, properties }, operation); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::popToItem(item, operation) + \since 6.7 + + Pops all items down to (but not including) \a item. Returns the last item + removed from the stack. + + If \a item is \c null, a warning is produced and \c null is returned. + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PopTransition will be used. + + \code + stackView.popToItem(someItem, StackView.Immediate) + \endcode + + \sa clear(), {Popping Items}, {Unwinding Items via Pop} +*/ +QQuickItem *QQuickStackView::popToItem(QQuickItem *item, Operation operation) +{ + Q_D(QQuickStackView); + return d->popToItem(item, operation, QQuickStackViewPrivate::CurrentItemPolicy::DoNotPop); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::popToIndex(index, operation) + \since 6.7 + + Pops all items down to (but not including) \a index. Returns the last item + removed from the stack. + + If \a index is out of bounds, a warning is produced and \c null is + returned. + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PopTransition will be used. + + \code + stackView.popToIndex(stackView.depth - 2, StackView.Immediate) + \endcode + + \sa clear(), {Popping Items}, {Unwinding Items via Pop} +*/ +QQuickItem *QQuickStackView::popToIndex(int index, Operation operation) +{ + Q_D(QQuickStackView); + if (index < 0 || index >= d->elements.size()) { + d->warn(QString::fromLatin1("popToIndex: index %1 is out of bounds (%2 item(s))") + .arg(index).arg(d->elements.size())); + return nullptr; + } + + if (index == d->elements.size() - 1) { + // This would pop down to the current item, which is a no-op. + return nullptr; + } + + QQuickStackElement *element = d->elements.at(index); + element->load(this); + return d->popToItem(element->item, operation, QQuickStackViewPrivate::CurrentItemPolicy::Pop); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::popCurrentItem(operation) + \since 6.7 + + Pops \l currentItem from the stack. Returns the last item removed from the + stack, or \c null if \l depth was \c 1. + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c PopTransition will be used. + + This function is equivalent to \c popToIndex(stackView.currentIndex - 1). + + \sa clear(), {Popping Items}, {Unwinding Items via Pop} +*/ +QQuickItem *QQuickStackView::popCurrentItem(Operation operation) +{ + Q_D(QQuickStackView); + if (d->elements.size() == 1) { + auto lastItemRemoved = d->elements.last()->item; + clear(operation); + return lastItemRemoved; + } + return d->popToItem(d->currentItem, operation, QQuickStackViewPrivate::CurrentItemPolicy::Pop); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::replaceCurrentItem(items, operation) + \keyword stackview-replacecurrentitem-items-overload + \since 6.7 + + Pops \l currentItem from the stack and pushes \a items. If the optional + \a operation is specified, the relevant transition will be used. Each item + can be followed by an optional set of properties that will be applied to + that item. Returns the item that became current. + + \include qquickstackview.qdocinc optional-properties-after-each-item + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c ReplaceTransition will be used. + + \code + stackView.replaceCurrentItem([item, rectComponent, Qt.resolvedUrl("MyItem.qml")]) + + // With properties: + stackView.replaceCurrentItem([ + item, { "color": "red" }, + rectComponent, { "color": "green" }, + Qt.resolvedUrl("MyItem.qml"), { "color": "blue" } + ]) + \endcode + + To push a single item, use the relevant overload: + \list + \li \l {stackview-replacecurrentitem-item-overload} + {replaceCurrentItem}(item, properties, operation) + \li \l {stackview-replacecurrentitem-component-overload} + {replaceCurrentItem}(component, properties, operation) + \li \l {stackview-replacecurrentitem-url-overload} + {replaceCurrentItem}(url, properties, operation) + \endlist + + \sa push(), {Replacing Items} +*/ +QQuickItem *QQuickStackView::replaceCurrentItem(const QList<QQuickStackViewArg> &args, + Operation operation) +{ + Q_D(QQuickStackView); + const QString operationName = QStringLiteral("replace"); + if (d->modifyingElements) { + d->warnOfInterruption(operationName); + return nullptr; + } + + QScopedValueRollback<bool> modifyingElements(d->modifyingElements, true); + QScopedValueRollback<QString> operationNameRollback(d->operation, operationName); + + QQuickStackElement *currentElement = !d->elements.isEmpty() ? d->elements.top() : nullptr; + + const QList<QQuickStackElement *> stackElements = d->parseElements(args); + + int oldDepth = d->elements.size(); + QQuickStackElement* exit = nullptr; + if (!d->elements.isEmpty()) + exit = d->elements.pop(); + + const bool successfullyReplaced = exit != currentElement + ? d->replaceElements(currentElement, stackElements) + : d->pushElements(stackElements); + if (successfullyReplaced) { + d->depthChange(d->elements.size(), oldDepth); + if (exit) { + exit->removal = true; + d->removing.insert(exit); + } + QQuickStackElement *enter = d->elements.top(); +#if QT_CONFIG(quick_viewtransitions) + d->startTransition(QQuickStackTransition::replaceExit(operation, exit, this), + QQuickStackTransition::replaceEnter(operation, enter, this), + operation == Immediate); +#endif + d->setCurrentItem(enter); + } + + return d->currentItem; +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::replaceCurrentItem(item, properties, operation) + \overload replaceCurrentItem() + \keyword stackview-replacecurrentitem-item-overload + \since 6.7 + + \include qquickstackview.qdocinc {replaceCurrentItem} {item} + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c ReplaceTransition will be used. + + To push several items onto the stack, use + \l {stackview-replacecurrentitem-items-overload} + {replaceCurrentItem}(items, operation). + + \sa {Replacing Items} +*/ +QQuickItem *QQuickStackView::replaceCurrentItem(QQuickItem *item, const QVariantMap &properties, + Operation operation) +{ + const QList<QQuickStackViewArg> args = { QQuickStackViewArg(item), QQuickStackViewArg(properties) }; + return replaceCurrentItem(args, operation); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::replaceCurrentItem(component, properties, operation) + \overload replaceCurrentItem() + \keyword stackview-replacecurrentitem-component-overload + \since 6.7 + + \include qquickstackview.qdocinc {replaceCurrentItem} {component} + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c ReplaceTransition will be used. + + To push several items onto the stack, use + \l {stackview-replacecurrentitem-items-overload} + {replaceCurrentItem}(items, operation). + + \sa {Replacing Items} +*/ +QQuickItem *QQuickStackView::replaceCurrentItem(QQmlComponent *component, const QVariantMap &properties, + Operation operation) +{ + const QList<QQuickStackViewArg> args = { QQuickStackViewArg(component), QQuickStackViewArg(properties) }; + return replaceCurrentItem(args, operation); +} + +/*! + \qmlmethod Item QtQuick.Controls::StackView::replaceCurrentItem(url, properties, operation) + \keyword stackview-replacecurrentitem-url-overload + \overload replaceCurrentItem() + \since 6.7 + + \include qquickstackview.qdocinc {replaceCurrentItem} {url} + + \include qquickstackview.qdocinc pop-ownership + + \include qquickstackview.qdocinc operation-values + + If no operation is provided, \c ReplaceTransition will be used. + + To push several items onto the stack, use + \l {stackview-replacecurrentitem-items-overload} + {replaceCurrentItem}(items, operation). + + \sa {Replacing Items} +*/ +QQuickItem *QQuickStackView::replaceCurrentItem(const QUrl &url, const QVariantMap &properties, + Operation operation) +{ + const QList<QQuickStackViewArg> args = { QQuickStackViewArg(url), QQuickStackViewArg(properties) }; + return replaceCurrentItem(args, operation); +} + +/*! + \since QtQuick.Controls 2.3 (Qt 5.10) + \qmlproperty bool QtQuick.Controls::StackView::empty + \readonly + + This property holds whether the stack is empty. + + \sa depth +*/ +bool QQuickStackView::isEmpty() const +{ + Q_D(const QQuickStackView); + return d->elements.isEmpty(); +} + +/*! + \qmlmethod void QtQuick.Controls::StackView::clear(transition) + + Removes all items from the stack. + + \include qquickstackview.qdocinc pop-ownership + + Since QtQuick.Controls 2.3, a \a transition can be optionally specified. Supported transitions: + + \value StackView.Immediate Clear the stack immediately without any transition (default). + \value StackView.PushTransition Clear the stack with a push transition. + \value StackView.ReplaceTransition Clear the stack with a replace transition. + \value StackView.PopTransition Clear the stack with a pop transition. +*/ +void QQuickStackView::clear(Operation operation) +{ +#if !QT_CONFIG(quick_viewtransitions) + Q_UNUSED(operation) +#endif + Q_D(QQuickStackView); + if (d->elements.isEmpty()) + return; + + const QString operationName = QStringLiteral("clear"); + if (d->modifyingElements) { + d->warnOfInterruption(operationName); + return; + } + + const int oldDepth = d->elements.size(); + + QScopedValueRollback<bool> modifyingElements(d->modifyingElements, true); + QScopedValueRollback<QString> operationNameRollback(d->operation, operationName); +#if QT_CONFIG(quick_viewtransitions) + if (operation != Immediate) { + QQuickStackElement *exit = d->elements.pop(); + exit->removal = true; + d->removing.insert(exit); + d->startTransition(QQuickStackTransition::popExit(operation, exit, this), + QQuickStackTransition::popEnter(operation, nullptr, this), false); + } +#endif + + d->setCurrentItem(nullptr); + qDeleteAll(d->elements); + d->elements.clear(); + d->depthChange(0, oldDepth); +} + +/*! + \qmlproperty var QtQuick.Controls::StackView::initialItem + + This property holds the initial item that should be shown when the StackView + is created. The initial item can be an \l Item, \l Component, or a \l [QML] url. + Specifying an initial item is equivalent to: + \code + Component.onCompleted: stackView.push(myInitialItem) + \endcode + + \sa push() +*/ +QJSValue QQuickStackView::initialItem() const +{ + Q_D(const QQuickStackView); + return d->initialItem; +} + +void QQuickStackView::setInitialItem(const QJSValue &item) +{ + Q_D(QQuickStackView); + d->initialItem = item; +} + +#if QT_CONFIG(quick_viewtransitions) +/*! + \qmlproperty Transition QtQuick.Controls::StackView::popEnter + + This property holds the transition that is applied to the item that + enters the stack when another item is popped off of it. + + \sa {Customizing StackView} +*/ +QQuickTransition *QQuickStackView::popEnter() const +{ + Q_D(const QQuickStackView); + if (d->transitioner) + return d->transitioner->removeDisplacedTransition; + return nullptr; +} + +void QQuickStackView::setPopEnter(QQuickTransition *enter) +{ + Q_D(QQuickStackView); + d->ensureTransitioner(); + if (d->transitioner->removeDisplacedTransition == enter) + return; + + d->transitioner->removeDisplacedTransition = enter; + emit popEnterChanged(); +} + +/*! + \qmlproperty Transition QtQuick.Controls::StackView::popExit + + This property holds the transition that is applied to the item that + exits the stack when the item is popped off of it. + + \sa {Customizing StackView} +*/ +QQuickTransition *QQuickStackView::popExit() const +{ + Q_D(const QQuickStackView); + if (d->transitioner) + return d->transitioner->removeTransition; + return nullptr; +} + +void QQuickStackView::setPopExit(QQuickTransition *exit) +{ + Q_D(QQuickStackView); + d->ensureTransitioner(); + if (d->transitioner->removeTransition == exit) + return; + + d->transitioner->removeTransition = exit; + emit popExitChanged(); +} + +/*! + \qmlproperty Transition QtQuick.Controls::StackView::pushEnter + + This property holds the transition that is applied to the item that + enters the stack when the item is pushed onto it. + + \sa {Customizing StackView} +*/ +QQuickTransition *QQuickStackView::pushEnter() const +{ + Q_D(const QQuickStackView); + if (d->transitioner) + return d->transitioner->addTransition; + return nullptr; +} + +void QQuickStackView::setPushEnter(QQuickTransition *enter) +{ + Q_D(QQuickStackView); + d->ensureTransitioner(); + if (d->transitioner->addTransition == enter) + return; + + d->transitioner->addTransition = enter; + emit pushEnterChanged(); +} + +/*! + \qmlproperty Transition QtQuick.Controls::StackView::pushExit + + This property holds the transition that is applied to the item that + exits the stack when another item is pushed onto it. + + \sa {Customizing StackView} +*/ +QQuickTransition *QQuickStackView::pushExit() const +{ + Q_D(const QQuickStackView); + if (d->transitioner) + return d->transitioner->addDisplacedTransition; + return nullptr; +} + +void QQuickStackView::setPushExit(QQuickTransition *exit) +{ + Q_D(QQuickStackView); + d->ensureTransitioner(); + if (d->transitioner->addDisplacedTransition == exit) + return; + + d->transitioner->addDisplacedTransition = exit; + emit pushExitChanged(); +} + +/*! + \qmlproperty Transition QtQuick.Controls::StackView::replaceEnter + + This property holds the transition that is applied to the item that + enters the stack when another item is replaced by it. + + \sa {Customizing StackView} +*/ +QQuickTransition *QQuickStackView::replaceEnter() const +{ + Q_D(const QQuickStackView); + if (d->transitioner) + return d->transitioner->moveTransition; + return nullptr; +} + +void QQuickStackView::setReplaceEnter(QQuickTransition *enter) +{ + Q_D(QQuickStackView); + d->ensureTransitioner(); + if (d->transitioner->moveTransition == enter) + return; + + d->transitioner->moveTransition = enter; + emit replaceEnterChanged(); +} + +/*! + \qmlproperty Transition QtQuick.Controls::StackView::replaceExit + + This property holds the transition that is applied to the item that + exits the stack when it is replaced by another item. + + \sa {Customizing StackView} +*/ +QQuickTransition *QQuickStackView::replaceExit() const +{ + Q_D(const QQuickStackView); + if (d->transitioner) + return d->transitioner->moveDisplacedTransition; + return nullptr; +} + +void QQuickStackView::setReplaceExit(QQuickTransition *exit) +{ + Q_D(QQuickStackView); + d->ensureTransitioner(); + if (d->transitioner->moveDisplacedTransition == exit) + return; + + d->transitioner->moveDisplacedTransition = exit; + emit replaceExitChanged(); +} +#endif + +void QQuickStackView::componentComplete() +{ + QQuickControl::componentComplete(); + + Q_D(QQuickStackView); + QScopedValueRollback<QString> operationNameRollback(d->operation, QStringLiteral("initialItem")); + QQuickStackElement *element = nullptr; + QString error; + int oldDepth = d->elements.size(); + if (QObject *o = d->initialItem.toQObject()) + element = QQuickStackElement::fromObject(o, this, &error); + else if (d->initialItem.isString()) + element = QQuickStackElement::fromString(d->initialItem.toString(), this, &error); + if (!error.isEmpty()) { + d->warn(error); + delete element; + } else if (d->pushElement(element)) { + d->depthChange(d->elements.size(), oldDepth); + d->setCurrentItem(element); + element->setStatus(QQuickStackView::Active); + } +} + +void QQuickStackView::geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry) +{ + QQuickControl::geometryChange(newGeometry, oldGeometry); + + Q_D(QQuickStackView); + for (QQuickStackElement *element : std::as_const(d->elements)) { + if (element->item) { + if (!element->widthValid) + element->item->setWidth(newGeometry.width()); + if (!element->heightValid) + element->item->setHeight(newGeometry.height()); + } + } +} + +bool QQuickStackView::childMouseEventFilter(QQuickItem *item, QEvent *event) +{ + // in order to block accidental user interaction while busy/transitioning, + // StackView filters out childrens' mouse events. therefore we block all + // press events. however, since push() may be called from signal handlers + // such as onPressed or onDoubleClicked, we must let the current mouse + // grabber item receive the respective mouse release event to avoid + // breaking its state (QTBUG-50305). + if (event->type() == QEvent::MouseButtonPress) + return true; + if (event->type() == QEvent::UngrabMouse) + return false; + QQuickWindow *window = item->window(); + return window && !window->mouseGrabberItem(); +} + +#if QT_CONFIG(quicktemplates2_multitouch) +void QQuickStackView::touchEvent(QTouchEvent *event) +{ + event->ignore(); // QTBUG-65084 +} +#endif + +#if QT_CONFIG(accessibility) +QAccessible::Role QQuickStackView::accessibleRole() const +{ + return QAccessible::LayeredPane; +} +#endif + +void QQuickStackViewAttachedPrivate::itemParentChanged(QQuickItem *item, QQuickItem *parent) +{ + Q_Q(QQuickStackViewAttached); + int oldIndex = element ? element->index : -1; + QQuickStackView *oldView = element ? element->view : nullptr; + QQuickStackView::Status oldStatus = element ? element->status : QQuickStackView::Inactive; + + QQuickStackView *newView = qobject_cast<QQuickStackView *>(parent); + element = newView ? QQuickStackViewPrivate::get(newView)->findElement(item) : nullptr; + + int newIndex = element ? element->index : -1; + QQuickStackView::Status newStatus = element ? element->status : QQuickStackView::Inactive; + + if (oldIndex != newIndex) + emit q->indexChanged(); + if (oldView != newView) + emit q->viewChanged(); + if (oldStatus != newStatus) + emit q->statusChanged(); +} + +QQuickStackViewAttached::QQuickStackViewAttached(QObject *parent) + : QObject(*(new QQuickStackViewAttachedPrivate), parent) +{ + Q_D(QQuickStackViewAttached); + QQuickItem *item = qobject_cast<QQuickItem *>(parent); + if (item) { + connect(item, &QQuickItem::visibleChanged, this, &QQuickStackViewAttached::visibleChanged); + QQuickItemPrivate::get(item)->addItemChangeListener(d, QQuickItemPrivate::Parent); + d->itemParentChanged(item, item->parentItem()); + } else if (parent) { + qmlWarning(parent) << "StackView must be attached to an Item"; + } +} + +QQuickStackViewAttached::~QQuickStackViewAttached() +{ + Q_D(QQuickStackViewAttached); + QQuickItem *parentItem = qobject_cast<QQuickItem *>(parent()); + if (parentItem) + QQuickItemPrivate::get(parentItem)->removeItemChangeListener(d, QQuickItemPrivate::Parent); +} + +/*! + \qmlattachedproperty int QtQuick.Controls::StackView::index + \readonly + + This attached property holds the stack index of the item it's + attached to, or \c -1 if the item is not in a stack. +*/ +int QQuickStackViewAttached::index() const +{ + Q_D(const QQuickStackViewAttached); + return d->element ? d->element->index : -1; +} + +/*! + \qmlattachedproperty StackView QtQuick.Controls::StackView::view + \readonly + + This attached property holds the stack view of the item it's + attached to, or \c null if the item is not in a stack. +*/ +QQuickStackView *QQuickStackViewAttached::view() const +{ + Q_D(const QQuickStackViewAttached); + return d->element ? d->element->view : nullptr; +} + +/*! + \qmlattachedproperty enumeration QtQuick.Controls::StackView::status + \readonly + + This attached property holds the stack status of the item it's + attached to, or \c StackView.Inactive if the item is not in a stack. + + Available values: + \value StackView.Inactive The item is inactive (or not in a stack). + \value StackView.Deactivating The item is being deactivated (popped off). + \value StackView.Activating The item is being activated (becoming the current item). + \value StackView.Active The item is active, that is, the current item. +*/ +QQuickStackView::Status QQuickStackViewAttached::status() const +{ + Q_D(const QQuickStackViewAttached); + return d->element ? d->element->status : QQuickStackView::Inactive; +} + +/*! + \since QtQuick.Controls 2.2 (Qt 5.9) + \qmlattachedproperty bool QtQuick.Controls::StackView::visible + + This attached property holds the visibility of the item it's attached to. + The value follows the value of \l Item::visible. + + By default, StackView shows incoming items when the enter transition begins, + and hides outgoing items when the exit transition ends. Setting this property + explicitly allows the default behavior to be overridden, making it possible + to keep items that are below the top-most item visible. + + \note The default transitions of most styles slide outgoing items outside the + view, and may also animate their opacity. In order to keep a full stack + of items visible, consider customizing the \l transitions so that the + items underneath can be seen. + + \image qtquickcontrols-stackview-visible.png + + \snippet qtquickcontrols-stackview-visible.qml 1 +*/ +bool QQuickStackViewAttached::isVisible() const +{ + const QQuickItem *parentItem = qobject_cast<QQuickItem *>(parent()); + return parentItem && parentItem->isVisible(); +} + +void QQuickStackViewAttached::setVisible(bool visible) +{ + Q_D(QQuickStackViewAttached); + d->explicitVisible = true; + QQuickItem *parentItem = qobject_cast<QQuickItem *>(parent()); + if (parentItem) + parentItem->setVisible(visible); +} + +void QQuickStackViewAttached::resetVisible() +{ + Q_D(QQuickStackViewAttached); + d->explicitVisible = false; + if (!d->element || !d->element->view) + return; + + QQuickItem *parentItem = qobject_cast<QQuickItem *>(parent()); + if (parentItem) + parentItem->setVisible(parentItem == d->element->view->currentItem()); +} + +/*! + \qmlattachedsignal QtQuick.Controls::StackView::activated() + \since QtQuick.Controls 2.1 (Qt 5.8) + + This attached signal is emitted when the item it's attached to is activated in the stack. + + \sa status +*/ + +/*! + \qmlattachedsignal QtQuick.Controls::StackView::deactivated() + \since QtQuick.Controls 2.1 (Qt 5.8) + + This attached signal is emitted when the item it's attached to is deactivated in the stack. + + \sa status +*/ + +/*! + \qmlattachedsignal QtQuick.Controls::StackView::activating() + \since QtQuick.Controls 2.1 (Qt 5.8) + + This attached signal is emitted when the item it's attached to is in the process of being + activated in the stack. + + \sa status +*/ + +/*! + \qmlattachedsignal QtQuick.Controls::StackView::deactivating() + \since QtQuick.Controls 2.1 (Qt 5.8) + + This attached signal is emitted when the item it's attached to is in the process of being + dectivated in the stack. + + \sa status +*/ + +/*! + \qmlattachedsignal QtQuick.Controls::StackView::removed() + \since QtQuick.Controls 2.1 (Qt 5.8) + + This attached signal is emitted when the item it's attached to has been + removed from the stack. It can be used to safely destroy an Item that was + pushed onto the stack, for example: + + \code + Item { + StackView.onRemoved: destroy() // Will be destroyed sometime after this call. + } + \endcode + + \sa status +*/ + +QT_END_NAMESPACE + +#include "moc_qquickstackview_p.cpp" |