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Diffstat (limited to 'src/corelib/kernel/qpropertybinding.cpp')
-rw-r--r-- | src/corelib/kernel/qpropertybinding.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/src/corelib/kernel/qpropertybinding.cpp b/src/corelib/kernel/qpropertybinding.cpp new file mode 100644 index 0000000000..8acaaeee72 --- /dev/null +++ b/src/corelib/kernel/qpropertybinding.cpp @@ -0,0 +1,143 @@ +/**************************************************************************** +** +** Copyright (C) 2020 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 https://www.qt.io/terms-conditions. For further +** information use the contact form at https://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.LGPL3 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-3.0.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 (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qpropertybinding_p.h" +#include "qproperty_p.h" + +#include <QScopedValueRollback> + +QT_BEGIN_NAMESPACE + +using namespace QtPrivate; + +QPropertyBindingPrivate::~QPropertyBindingPrivate() +{ + if (firstObserver) + firstObserver.unlink(); +} + +void QPropertyBindingPrivate::unlinkAndDeref() +{ + propertyDataPtr = nullptr; + if (!ref.deref()) + delete this; +} + +void QPropertyBindingPrivate::markDirtyAndNotifyObservers() +{ + dirty = true; + if (firstObserver) + firstObserver.notify(this); +} + +bool QPropertyBindingPrivate::evaluateIfDirtyAndReturnTrueIfValueChanged() +{ + if (!dirty) + return false; + + if (updating) { + error = QPropertyBindingError(QPropertyBindingError::BindingLoop); + return false; + } + + QScopedValueRollback<bool> updateGuard(updating, true); + + BindingEvaluationState evaluationFrame(this); + bool changed = false; + auto result = evaluationFunction(/*version*/1, propertyDataPtr); + if (auto changedPtr = std::get_if<bool>(&result)) + changed = *changedPtr; + else if (auto errorPtr = std::get_if<QPropertyBindingError>(&result)) + error = std::move(*errorPtr); + dirty = false; + return changed; +} + +QUntypedPropertyBinding::QUntypedPropertyBinding() = default; + +QUntypedPropertyBinding::QUntypedPropertyBinding(QUntypedPropertyBinding::BindingEvaluationFunction function, + const QPropertyBindingSourceLocation &location) +{ + d = new QPropertyBindingPrivate(std::move(function), std::move(location)); +} + +QUntypedPropertyBinding::QUntypedPropertyBinding(QUntypedPropertyBinding &&other) + : d(std::move(other.d)) +{ +} + +QUntypedPropertyBinding::QUntypedPropertyBinding(const QUntypedPropertyBinding &other) + : d(other.d) +{ +} + +QUntypedPropertyBinding &QUntypedPropertyBinding::operator=(const QUntypedPropertyBinding &other) +{ + d = other.d; + return *this; +} + +QUntypedPropertyBinding &QUntypedPropertyBinding::operator=(QUntypedPropertyBinding &&other) +{ + d = std::move(other.d); + return *this; +} + +QUntypedPropertyBinding::QUntypedPropertyBinding(const QPropertyBindingPrivatePtr &priv) + : d(priv) +{ +} + +QUntypedPropertyBinding::~QUntypedPropertyBinding() +{ +} + +bool QUntypedPropertyBinding::isNull() const +{ + return !d; +} + +QPropertyBindingError QUntypedPropertyBinding::error() const +{ + if (!d) + return QPropertyBindingError(); + return d->error; +} + +QT_END_NAMESPACE |