qt-everywhere-src-5.14.1/qtdeclarative/src/quick/qtquick2.cpp

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** This file is part of the QtQuick module of the Qt Toolkit.
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#include "qtquick2_p.h"
#include <private/qqmlengine_p.h>
#include <private/qquickutilmodule_p.h>
#include <private/qquickvaluetypes_p.h>
#include <private/qquickitemsmodule_p.h>
#include <private/qquickaccessiblefactory_p.h>

#include <private/qqmldebugconnector_p.h>
#include <private/qqmldebugserviceinterfaces_p.h>
#include <private/qqmldebugstatesdelegate_p.h>
#include <private/qqmlbinding_p.h>
#include <private/qqmlcontext_p.h>
#include <private/qquickapplication_p.h>
#include <QtQuick/private/qquickpropertychanges_p.h>
#include <QtQuick/private/qquickstate_p.h>
#include <qqmlproperty.h>
#include <QtCore/QPointer>

QT_BEGIN_NAMESPACE

#if !QT_CONFIG(qml_debug)

class QQmlQtQuick2DebugStatesDelegate : public QQmlDebugStatesDelegate {};

#else

class QQmlQtQuick2DebugStatesDelegate : public QQmlDebugStatesDelegate
{
public:
    QQmlQtQuick2DebugStatesDelegate();
    ~QQmlQtQuick2DebugStatesDelegate();
    void buildStatesList(bool cleanList, const QList<QPointer<QObject> > &instances) override;
    void updateBinding(QQmlContext *context,
                       const QQmlProperty &property,
                       const QVariant &expression, bool isLiteralValue,
                       const QString &fileName, int line, int column,
                       bool *isBaseState) override;
    bool setBindingForInvalidProperty(QObject *object,
                                      const QString &propertyName,
                                      const QVariant &expression,
                                      bool isLiteralValue) override;
    void resetBindingForInvalidProperty(QObject *object,
                                        const QString &propertyName) override;

private:
    void buildStatesList(QObject *obj);

    QList<QPointer<QQuickState> > m_allStates;
};

QQmlQtQuick2DebugStatesDelegate::QQmlQtQuick2DebugStatesDelegate()
{
}

QQmlQtQuick2DebugStatesDelegate::~QQmlQtQuick2DebugStatesDelegate()
{
}

void QQmlQtQuick2DebugStatesDelegate::buildStatesList(bool cleanList,
                                                      const QList<QPointer<QObject> > &instances)
{
    if (cleanList)
        m_allStates.clear();

    //only root context has all instances
    for (int ii = 0; ii < instances.count(); ++ii) {
        buildStatesList(instances.at(ii));
    }
}

void QQmlQtQuick2DebugStatesDelegate::buildStatesList(QObject *obj)
{
    if (QQuickState *state = qobject_cast<QQuickState *>(obj)) {
        m_allStates.append(state);
    }

    QObjectList children = obj->children();
    for (int ii = 0; ii < children.count(); ++ii) {
        buildStatesList(children.at(ii));
    }
}

void QQmlQtQuick2DebugStatesDelegate::updateBinding(QQmlContext *context,
                                                            const QQmlProperty &property,
                                                            const QVariant &expression, bool isLiteralValue,
                                                            const QString &fileName, int line, int column,
                                                            bool *inBaseState)
{
    Q_UNUSED(column);
    typedef QPointer<QQuickState> QuickStatePointer;
    QObject *object = property.object();
    QString propertyName = property.name();
    for (const QuickStatePointer& statePointer : qAsConst(m_allStates)) {
        if (QQuickState *state = statePointer.data()) {
            // here we assume that the revert list on itself defines the base state
            if (state->isStateActive() && state->containsPropertyInRevertList(object, propertyName)) {
                *inBaseState = false;

                QQmlBinding *newBinding = nullptr;
                if (!isLiteralValue) {
                    newBinding = QQmlBinding::create(&QQmlPropertyPrivate::get(property)->core,
                                                     expression.toString(), object,
                                                     QQmlContextData::get(context), fileName,
                                                     line);
                    newBinding->setTarget(property);
                }

                state->changeBindingInRevertList(object, propertyName, newBinding);

                if (isLiteralValue)
                    state->changeValueInRevertList(object, propertyName, expression);
            }
        }
    }
}

bool QQmlQtQuick2DebugStatesDelegate::setBindingForInvalidProperty(QObject *object,
                                                                           const QString &propertyName,
                                                                           const QVariant &expression,
                                                                           bool isLiteralValue)
{
    if (QQuickPropertyChanges *propertyChanges = qobject_cast<QQuickPropertyChanges *>(object)) {
        if (isLiteralValue)
            propertyChanges->changeValue(propertyName, expression);
        else
            propertyChanges->changeExpression(propertyName, expression.toString());
        return true;
    } else {
        return false;
    }
}

void QQmlQtQuick2DebugStatesDelegate::resetBindingForInvalidProperty(QObject *object, const QString &propertyName)
{
    if (QQuickPropertyChanges *propertyChanges = qobject_cast<QQuickPropertyChanges *>(object)) {
        propertyChanges->removeProperty(propertyName);
    }
}

#endif // QT_CONFIG(qml_debug)

void QQmlQtQuick2Module::defineModule()
{
    QQuick_initializeProviders();

    QQuickUtilModule::defineModule();
    QQuickItemsModule::defineModule();

    qmlRegisterUncreatableType<QQuickApplication>("QtQuick",2,0,"Application", QQuickApplication::tr("Application is an abstract class"));

    QQuickValueTypes::registerValueTypes();

#if QT_CONFIG(accessibility)
    QAccessible::installFactory(&qQuickAccessibleFactory);
#endif

    QQmlEngineDebugService *debugService = QQmlDebugConnector::service<QQmlEngineDebugService>();
    if (debugService)
        debugService->setStatesDelegate(new QQmlQtQuick2DebugStatesDelegate);
}

void QQmlQtQuick2Module::undefineModule()
{
    QQuick_deinitializeProviders();
}

QT_END_NAMESPACE