diff options
Diffstat (limited to 'src/qml/doc/snippets/qml/integrating-javascript/scarceresources/avatarExample.cpp')
| -rw-r--r-- | src/qml/doc/snippets/qml/integrating-javascript/scarceresources/avatarExample.cpp | 195 |
1 files changed, 83 insertions, 112 deletions
diff --git a/src/qml/doc/snippets/qml/integrating-javascript/scarceresources/avatarExample.cpp b/src/qml/doc/snippets/qml/integrating-javascript/scarceresources/avatarExample.cpp index d74cc13d04..48f2beeef0 100644 --- a/src/qml/doc/snippets/qml/integrating-javascript/scarceresources/avatarExample.cpp +++ b/src/qml/doc/snippets/qml/integrating-javascript/scarceresources/avatarExample.cpp @@ -1,134 +1,105 @@ -/**************************************************************************** -** -** Copyright (C) 2017 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** 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. -** -** BSD License Usage -** Alternatively, you may use this file under the terms of the BSD license -** as follows: -** -** "Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions are -** met: -** * Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** * Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** * Neither the name of The Qt Company Ltd nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2017 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause #include "avatarExample.h" #include <QQmlEngine> #include <QQmlComponent> +#include <QGuiApplication> -void registerTypes() +struct Expectations { -//![0] - qmlRegisterType<AvatarExample>("Qt.example", 1, 0, "AvatarExample"); -//![0] -} + QQmlEngine engine; -void expectOne() -{ + void expectOne() + { //![1] -QQmlComponent component(&engine, "exampleOne.qml"); -QObject *object = component.create(); -// The scarce resource will have been released automatically -// by this point, after the binding expression was evaluated. -delete object; + QQmlComponent component(&engine, "qrc:/exampleOne.qml"); + QObject *object = component.create(); + // The scarce resource will have been released automatically + // by this point, after the binding expression was evaluated. + bool expectedResult = (object->property("avatarWidth").toInt() == 100); + delete object; //![1] -} + Q_ASSERT(expectedResult); + } -void expectTwo() -{ + void expectTwo() + { //![2] -QQmlComponent component(&engine, "exampleTwo.qml"); -QObject *object = component.create(); -// The scarce resource will not have been released automatically -// after the binding expression was evaluated. -// Since the scarce resource was not released explicitly prior -// to the binding expression being evaluated, we get: -bool expectedResult = (object->property("avatar").isValid() == true); -delete object; + QQmlComponent component(&engine, "qrc:/exampleTwo.qml"); + QObject *object = component.create(); + // The scarce resource will not have been released automatically + // after the binding expression was evaluated. + // Since the scarce resource was not released explicitly prior + // to the binding expression being evaluated, we get: + bool expectedResult = (object->property("avatar").isValid() == true); + delete object; //![2] -} + Q_ASSERT(expectedResult); + } -void expectThree() -{ + void expectThree() + { //![3] -QQmlComponent component(&engine, "exampleThree.qml"); -QObject *object = component.create(); -// The resource was preserved explicitly during evaluation of the -// JavaScript expression. Thus, during property assignment, the -// scarce resource was still valid, and so we get: -bool expectedResult = (object->property("avatar").isValid() == true); -// The scarce resource will not be released until all references to -// the resource are released, and the JavaScript garbage collector runs. -delete object; + QQmlComponent component(&engine, "qrc:/exampleThree.qml"); + QObject *object = component.create(); + // The resource was preserved explicitly during evaluation of the + // JavaScript expression. Thus, during property assignment, the + // scarce resource was still valid, and so we get: + bool expectedResult = (object->property("avatar").isValid() == true); + // The scarce resource will not be released until all references to + // the resource are released, and the JavaScript garbage collector runs. + delete object; //![3] -} + Q_ASSERT(expectedResult); + } -void expectFour() -{ + void expectFour() + { //![4] -QQmlComponent component(&engine, "exampleFour.qml"); -QObject *object = component.create(); -// The scarce resource was explicitly preserved by the client during -// the importAvatar() function, and so the scarce resource -// remains valid until the explicit call to releaseAvatar(). As such, -// we get the expected results: -bool expectedResultOne = (object->property("avatarOne").isValid() == true); -bool expectedResultTwo = (object->property("avatarTwo").isValid() == false); -// Because the scarce resource referenced by avatarTwo was released explicitly, -// it will no longer be consuming any system resources (beyond what a normal -// JS Object would; that small overhead will exist until the JS GC runs, as per -// any other JavaScript object). -delete object; + QQmlComponent component(&engine, "qrc:/exampleFour.qml"); + QObject *object = component.create(); + // The scarce resource was explicitly preserved by the client during + // the importAvatar() function, and so the scarce resource + // remains valid until the explicit call to releaseAvatar(). As such, + // we get the expected results: + bool expectedResultOne = (object->property("avatarOne").isValid() == true); + bool expectedResultTwo = (object->property("avatarTwo").isValid() == false); + // Because the scarce resource referenced by avatarTwo was released explicitly, + // it will no longer be consuming any system resources (beyond what a normal + // JS Object would; that small overhead will exist until the JS GC runs, as per + // any other JavaScript object). + delete object; //![4] -} + Q_ASSERT(expectedResultOne); + Q_ASSERT(expectedResultTwo); + } -void expectFive() -{ + void expectFive() + { //![5] -QQmlComponent component(&engine, "exampleFive.qml"); -QObject *object = component.create(); -// We have the expected results: -bool expectedResultOne = (object->property("avatarOne").isValid() == false); -bool expectedResultTwo = (object->property("avatarTwo").isValid() == false); -// Because although only avatarTwo was explicitly released, -// avatarOne and avatarTwo were referencing the same -// scarce resource. -delete object; + QQmlComponent component(&engine, "qrc:/exampleFive.qml"); + QObject *object = component.create(); + // We have the expected results: + bool expectedResultOne = (object->property("avatarOne").isValid() == false); + bool expectedResultTwo = (object->property("avatarTwo").isValid() == false); + // Because although only avatarTwo was explicitly released, + // avatarOne and avatarTwo were referencing the same + // scarce resource. + delete object; //![5] + Q_ASSERT(expectedResultOne); + Q_ASSERT(expectedResultTwo); + } +}; + +int main(int argc, char *argv[]) +{ + QGuiApplication app(argc, argv); + Expectations expectations; + expectations.expectOne(); + expectations.expectTwo(); + expectations.expectThree(); + expectations.expectFour(); + expectations.expectFive(); } |