Share common code for baseline-testing widget UIs

Setting up the baseline tests, creating an appearance identifier,
and basic image-grabbing functionality doesn't need to be reinvented
for each test case that wants to use baseline testing of widget UIs.

As a drive-by, remove unneeded Qt 5 meta tags from .pri file.

Change-Id: I1562e1b377946305cac018e0f0f0175c2c07cd31
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

7 files changed, 270 insertions, 251 deletions

diff --git a/tests/baseline/shared/qbaselinetest.pri b/tests/baseline/shared/qbaselinetest.pri
index 921871b189..453bc341f1 100644
--- a/tests/baseline/shared/qbaselinetest.pri
+++ b/tests/baseline/shared/qbaselinetest.pri
@@ -6,8 +6,9 @@ SOURCES += \
 HEADERS += \
         $$PWD/qbaselinetest.h
 
-win32:MKSPEC=$$replace(QMAKESPEC, \\\\, /)
-else:MKSPEC=$$QMAKESPEC
-DEFINES += QMAKESPEC=\\\"$$MKSPEC\\\"
+qtHaveModule(widgets) {
+        SOURCES += $$PWD/qwidgetbaselinetest.cpp
+        HEADERS += $$PWD/qwidgetbaselinetest.h
+}
 
 include($$PWD/baselineprotocol.pri)
diff --git a/tests/baseline/shared/qwidgetbaselinetest.cpp b/tests/baseline/shared/qwidgetbaselinetest.cpp
new file mode 100644
index 0000000000..9aafe152db
--- /dev/null
+++ b/tests/baseline/shared/qwidgetbaselinetest.cpp
@@ -0,0 +1,189 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwidgetbaselinetest.h"
+
+#include <qbaselinetest.h>
+#include <QApplication>
+#include <QStyle>
+#include <QScreen>
+
+QT_BEGIN_NAMESPACE
+
+QWidgetBaselineTest::QWidgetBaselineTest()
+{
+    QBaselineTest::addClientProperty("Project", "Widgets");
+
+    // Set key platform properties that are relevant for the appearance of widgets
+    const QString platformName = QGuiApplication::platformName() + "-" + QSysInfo::productType();
+    QBaselineTest::addClientProperty("PlatformName", platformName);
+    QBaselineTest::addClientProperty("OSVersion", QSysInfo::productVersion());
+
+    // Encode a number of parameters that impact the UI
+    QPalette palette;
+    QFont font;
+    QByteArray appearanceBytes;
+    {
+        QDataStream appearanceStream(&appearanceBytes, QIODevice::WriteOnly);
+        appearanceStream << palette << font <<
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+            QApplication::style()->metaObject()->className();
+#else
+            QApplication::style()->name();
+#endif
+        const qreal screenDpr = QApplication::primaryScreen()->devicePixelRatio();
+        if (screenDpr != 1.0)
+            qWarning() << "DPR is" << screenDpr << "- images will be scaled";
+    }
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+    const quint16 appearanceId = qChecksum(appearanceBytes, appearanceBytes.size());
+#else
+    const quint16 appearanceId = qChecksum(appearanceBytes);
+#endif
+
+    // Assume that text that's darker than the background means we run in light mode
+    // This results in a more meaningful appearance ID between different runs than
+    // just the checksum of the various attributes.
+    const QColor windowColor = palette.window().color();
+    const QColor textColor = palette.text().color();
+    const QString appearanceIdString = (windowColor.value() > textColor.value()
+                                        ? QString("light-%1") : QString("dark-%1"))
+                                       .arg(appearanceId, 0, 16);
+    QBaselineTest::addClientProperty("AppearanceID", appearanceIdString);
+
+    // let users know where they can find the results
+    qDebug() << "PlatformName computed to be:" << platformName;
+    qDebug() << "Appearance ID computed as:" << appearanceIdString;
+}
+
+void QWidgetBaselineTest::initTestCase()
+ {
+    // Check and setup the environment. Failure to do so skips the test.
+    QByteArray msg;
+    if (!QBaselineTest::connectToBaselineServer(&msg))
+        QSKIP(msg);
+}
+
+void QWidgetBaselineTest::init()
+{
+    QVERIFY(!window);
+    window = new QWidget;
+    window->setWindowTitle(QTest::currentDataTag());
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    window->setScreen(QGuiApplication::primaryScreen());
+#endif
+    window->move(QGuiApplication::primaryScreen()->availableGeometry().topLeft());
+
+    doInit();
+}
+
+void QWidgetBaselineTest::cleanup()
+{
+    doCleanup();
+
+    delete window;
+    window = nullptr;
+}
+
+void QWidgetBaselineTest::makeVisible()
+{
+    Q_ASSERT(window);
+    window->show();
+    QApplication::setActiveWindow(window);
+    QVERIFY(QTest::qWaitForWindowActive(window));
+    // explicitly unset focus, the test needs to control when focus is shown
+    if (window->focusWidget())
+        window->focusWidget()->clearFocus();
+}
+
+/*
+    Always return images scaled to a DPR of 1.0.
+
+    This might produce some fuzzy differences, but lets us
+    compare those.
+*/
+QImage QWidgetBaselineTest::takeSnapshot()
+{
+    QGuiApplication::processEvents();
+    QPixmap pm = window->grab();
+    QTransform scaleTransform = QTransform::fromScale(1.0 / pm.devicePixelRatioF(), 1.0 / pm.devicePixelRatioF());
+    return pm.toImage().transformed(scaleTransform, Qt::SmoothTransformation);
+}
+
+/*!
+    Sets standard widget properties on the test window and its children,
+    and uploads snapshots. The widgets are returned in the same state
+    that they had before.
+
+    Call this helper after setting up the test window.
+*/
+void QWidgetBaselineTest::takeStandardSnapshots()
+{
+    makeVisible();
+    struct PublicWidget : QWidget {
+        bool focusNextPrevChild(bool next) override { return QWidget::focusNextPrevChild(next); }
+    };
+
+    QBASELINE_CHECK(takeSnapshot(), "default");
+
+    // try hard to set focus
+    static_cast<PublicWidget*>(window)->focusNextPrevChild(true);
+    if (!window->focusWidget()) {
+        QWidget *firstChild = window->findChild<QWidget*>();
+        if (firstChild)
+            firstChild->setFocus();
+    }
+    if (testWindow()->focusWidget()) {
+        QBASELINE_CHECK(takeSnapshot(), "focused");
+        testWindow()->focusWidget()->clearFocus();
+    }
+
+    // this disables all children
+    window->setEnabled(false);
+    QBASELINE_CHECK(takeSnapshot(), "disabled");
+    window->setEnabled(true);
+
+    // show and activate another window so that our test window becomes inactive
+    QWidget otherWindow;
+    otherWindow.move(window->geometry().bottomRight() + QPoint(10, 10));
+    otherWindow.resize(50, 50);
+    otherWindow.setWindowFlags(Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
+    otherWindow.show();
+    otherWindow.windowHandle()->requestActivate();
+    QVERIFY(QTest::qWaitForWindowActive(&otherWindow));
+    QBASELINE_CHECK(takeSnapshot(), "inactive");
+
+    window->windowHandle()->requestActivate();
+    QVERIFY(QTest::qWaitForWindowActive(window));
+    if (window->focusWidget())
+        window->focusWidget()->clearFocus();
+}
+
+#include "qwidgetbaselinetest.moc"
+
+QT_END_NAMESPACE
diff --git a/tests/baseline/shared/qwidgetbaselinetest.h b/tests/baseline/shared/qwidgetbaselinetest.h
new file mode 100644
index 0000000000..db73dd0540
--- /dev/null
+++ b/tests/baseline/shared/qwidgetbaselinetest.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#pragma once
+
+#include <QObject>
+#include <QImage>
+
+QT_BEGIN_NAMESPACE
+
+class QWidget;
+
+class QWidgetBaselineTest : public QObject
+{
+    Q_OBJECT
+
+public:
+    QWidgetBaselineTest();
+
+    void takeStandardSnapshots();
+    QWidget *testWindow() const { return window; }
+
+protected:
+    virtual void doInit() {}
+    virtual void doCleanup() {}
+
+private slots:
+    void initTestCase();
+    void init();
+    void cleanup();
+
+protected:
+    void makeVisible();
+    QImage takeSnapshot();
+
+private:
+    QWidget *window = nullptr;
+};
+
+QT_END_NAMESPACE
diff --git a/tests/baseline/stylesheet/CMakeLists.txt b/tests/baseline/stylesheet/CMakeLists.txt
index 5129f1691c..11f6e52179 100644
--- a/tests/baseline/stylesheet/CMakeLists.txt
+++ b/tests/baseline/stylesheet/CMakeLists.txt
@@ -7,6 +7,7 @@ qt_internal_add_test(tst_baseline_stylesheet
     SOURCES
         ../shared/baselineprotocol.cpp ../shared/baselineprotocol.h ../shared/lookup3.cpp
         ../shared/qbaselinetest.cpp ../shared/qbaselinetest.h
+        ../shared/qwidgetbaselinetest.cpp ../shared/qwidgetbaselinetest.h
         tst_baseline_stylesheet.cpp
     INCLUDE_DIRECTORIES
         ../shared
diff --git a/tests/baseline/stylesheet/tst_baseline_stylesheet.cpp b/tests/baseline/stylesheet/tst_baseline_stylesheet.cpp
index b755237b30..fe666d83e8 100644
--- a/tests/baseline/stylesheet/tst_baseline_stylesheet.cpp
+++ b/tests/baseline/stylesheet/tst_baseline_stylesheet.cpp
@@ -27,104 +27,39 @@
 ****************************************************************************/
 
 #include <qbaselinetest.h>
+#include <qwidgetbaselinetest.h>
 #include <QtWidgets>
 #include <QByteArray>
 
-class tst_Stylesheet : public QObject
+class tst_Stylesheet : public QWidgetBaselineTest
 {
     Q_OBJECT
 
 public:
     tst_Stylesheet();
 
-    QWidget *testWindow() const { return window; }
     void loadTestFiles();
 
-private slots:
-    void initTestCase();
-    void init();
-    void cleanup();
+    void doInit() override;
 
+private slots:
     void tst_QToolButton_data();
     void tst_QToolButton();
 
 private:
-    void makeVisible();
-    QImage takeSnapshot();
     QDir styleSheetDir;
-
-    QWidget *window = nullptr;
 };
 
 tst_Stylesheet::tst_Stylesheet()
 {
-    QBaselineTest::addClientProperty("Project", "Widgets");
-
-    // Set key platform properties that are relevant for the appearance of widgets
-    const QString platformName = QGuiApplication::platformName() + "-" + QSysInfo::productType();
-    QBaselineTest::addClientProperty("PlatformName", platformName);
-    QBaselineTest::addClientProperty("OSVersion", QSysInfo::productVersion());
-
-    // Encode a number of parameters that impact the UI
-    QPalette palette;
-    QFont font;
-    QByteArray appearanceBytes;
-    {
-        QDataStream appearanceStream(&appearanceBytes, QIODevice::WriteOnly);
-        appearanceStream << palette << font <<
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-            QApplication::style()->metaObject()->className();
-#else
-            QApplication::style()->name();
-#endif
-        const qreal screenDpr = QApplication::primaryScreen()->devicePixelRatio();
-        if (screenDpr != 1.0)
-            qWarning() << "DPR is" << screenDpr << "- images will be scaled";
-    }
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    const quint16 appearanceId = qChecksum(appearanceBytes, appearanceBytes.size());
-#else
-    const quint16 appearanceId = qChecksum(appearanceBytes);
-#endif
-
-    // Assume that text that's darker than the background means we run in light mode
-    // This results in a more meaningful appearance ID between different runs than
-    // just the checksum of the various attributes.
-    const QColor windowColor = palette.window().color();
-    const QColor textColor = palette.text().color();
-    const QString appearanceIdString = (windowColor.value() > textColor.value()
-                                        ? QString("light-%1") : QString("dark-%1"))
-                                       .arg(appearanceId, 0, 16);
-    QBaselineTest::addClientProperty("AppearanceID", appearanceIdString);
-
-    // let users know where they can find the results
-    qDebug() << "PlatformName computed to be:" << platformName;
-    qDebug() << "Appearance ID computed as:" << appearanceIdString;
-}
-
-void tst_Stylesheet::initTestCase()
-{
     QString baseDir = QFINDTESTDATA("qss/default.qss");
     styleSheetDir = QDir(QFileInfo(baseDir).path());
-
-    // Check and setup the environment. Failure to do so skips the test.
-    QByteArray msg;
-    if (!QBaselineTest::connectToBaselineServer(&msg))
-        QSKIP(msg);
 }
 
-void tst_Stylesheet::init()
+void tst_Stylesheet::doInit()
 {
     QFETCH(QString, styleSheet);
-
-    QVERIFY(!window);
-    window = new QWidget;
-    window->setWindowTitle(QTest::currentDataTag());
-#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
-    window->setScreen(QGuiApplication::primaryScreen());
-#endif
-    window->move(QGuiApplication::primaryScreen()->availableGeometry().topLeft());
-    window->setStyleSheet(styleSheet);
+    testWindow()->setStyleSheet(styleSheet);
 }
 
 void tst_Stylesheet::loadTestFiles()
@@ -153,36 +88,6 @@ void tst_Stylesheet::loadTestFiles()
     }
 }
 
-void tst_Stylesheet::makeVisible()
-{
-    window->show();
-    window->window()->windowHandle()->requestActivate();
-    // explicitly unset focus, the test needs to control when focus is shown
-    if (window->focusWidget())
-        window->focusWidget()->clearFocus();
-    QVERIFY(QTest::qWaitForWindowActive(window));
-}
-
-/*
-    Always return images scaled to a DPR of 1.0.
-
-    This might produce some fuzzy differences, but lets us
-    compare those.
-*/
-QImage tst_Stylesheet::takeSnapshot()
-{
-    QGuiApplication::processEvents();
-    QPixmap pm = window->grab();
-    QTransform scaleTransform = QTransform::fromScale(1.0 / pm.devicePixelRatioF(), 1.0 / pm.devicePixelRatioF());
-    return pm.toImage().transformed(scaleTransform, Qt::SmoothTransformation);
-}
-
-void tst_Stylesheet::cleanup()
-{
-    delete window;
-    window = nullptr;
-}
-
 void tst_Stylesheet::tst_QToolButton_data()
 {
     loadTestFiles();
diff --git a/tests/baseline/widgets/CMakeLists.txt b/tests/baseline/widgets/CMakeLists.txt
index eac3ca6753..124e67785f 100644
--- a/tests/baseline/widgets/CMakeLists.txt
+++ b/tests/baseline/widgets/CMakeLists.txt
@@ -2,6 +2,7 @@ qt_internal_add_test(tst_baseline_widgets
     SOURCES
         ../shared/baselineprotocol.cpp ../shared/baselineprotocol.h ../shared/lookup3.cpp
         ../shared/qbaselinetest.cpp ../shared/qbaselinetest.h
+        ../shared/qwidgetbaselinetest.cpp ../shared/qwidgetbaselinetest.h
         tst_baseline_widgets.cpp
     INCLUDE_DIRECTORIES
         ../shared
diff --git a/tests/baseline/widgets/tst_baseline_widgets.cpp b/tests/baseline/widgets/tst_baseline_widgets.cpp
index c2afc35816..86fc62f717 100644
--- a/tests/baseline/widgets/tst_baseline_widgets.cpp
+++ b/tests/baseline/widgets/tst_baseline_widgets.cpp
@@ -27,167 +27,24 @@
 ****************************************************************************/
 
 #include <qbaselinetest.h>
+#include <qwidgetbaselinetest.h>
 #include <QtWidgets>
 
-class tst_Widgets : public QObject
+class tst_Widgets : public QWidgetBaselineTest
 {
     Q_OBJECT
 
 public:
-    tst_Widgets();
-
-    void takeStandardSnapshots();
-    QWidget *testWindow() const { return window; }
+    tst_Widgets() = default;
 
 private slots:
-    void initTestCase();
-    void init();
-    void cleanup();
-
     void tst_QSlider_data();
     void tst_QSlider();
 
     void tst_QPushButton_data();
     void tst_QPushButton();
-
-private:
-    void makeVisible();
-    QImage takeSnapshot();
-
-    QWidget *window = nullptr;
 };
 
-tst_Widgets::tst_Widgets()
-{
-    QBaselineTest::addClientProperty("Project", "Widgets");
-
-    // Set key platform properties that are relevant for the appearance of widgets
-    const QString platformName = QGuiApplication::platformName() + "-" + QSysInfo::productType();
-    QBaselineTest::addClientProperty("PlatformName", platformName);
-    QBaselineTest::addClientProperty("OSVersion", QSysInfo::productVersion());
-
-    // Encode a number of parameters that impact the UI
-    QPalette palette;
-    QFont font;
-    QByteArray appearanceBytes;
-    {
-        QDataStream appearanceStream(&appearanceBytes, QIODevice::WriteOnly);
-        appearanceStream << palette << font << QApplication::style()->name();
-        const qreal screenDpr = QApplication::primaryScreen()->devicePixelRatio();
-        if (screenDpr != 1.0)
-            qWarning() << "DPR is" << screenDpr << "- images will be scaled";
-    }
-    const quint16 appearanceId = qChecksum(appearanceBytes);
-
-    // Assume that text that's darker than the background means we run in light mode
-    // This results in a more meaningful appearance ID between different runs than
-    // just the checksum of the various attributes.
-    const QColor windowColor = palette.window().color();
-    const QColor textColor = palette.text().color();
-    const QString appearanceIdString = (windowColor.value() > textColor.value()
-                                        ? QString("light-%1") : QString("dark-%1"))
-                                       .arg(appearanceId, 0, 16);
-    QBaselineTest::addClientProperty("AppearanceID", appearanceIdString);
-
-    // let users know where they can find the results
-    qDebug() << "PlatformName computed to be:" << platformName;
-    qDebug() << "Appearance ID computed as:" << appearanceIdString;
-}
-
-void tst_Widgets::initTestCase()
-{
-    // Check and setup the environment. Failure to do so skips the test.
-    QByteArray msg;
-    if (!QBaselineTest::connectToBaselineServer(&msg))
-        QSKIP(msg);
-}
-
-void tst_Widgets::init()
-{
-    QVERIFY(!window);
-    window = new QWidget;
-    window->setWindowTitle(QTest::currentDataTag());
-    window->setScreen(QGuiApplication::primaryScreen());
-    window->move(QGuiApplication::primaryScreen()->availableGeometry().topLeft());
-}
-
-void tst_Widgets::makeVisible()
-{
-    window->show();
-    window->window()->windowHandle()->requestActivate();
-    // explicitly unset focus, the test needs to control when focus is shown
-    if (window->focusWidget())
-        window->focusWidget()->clearFocus();
-    QVERIFY(QTest::qWaitForWindowActive(window));
-}
-
-/*
-    Always return images scaled to a DPR of 1.0.
-
-    This might produce some fuzzy differences, but lets us
-    compare those.
-*/
-QImage tst_Widgets::takeSnapshot()
-{
-    QGuiApplication::processEvents();
-    QPixmap pm = window->grab();
-    QTransform scaleTransform = QTransform::fromScale(1.0 / pm.devicePixelRatioF(), 1.0 / pm.devicePixelRatioF());
-    return pm.toImage().transformed(scaleTransform, Qt::SmoothTransformation);
-}
-
-/*!
-    Sets standard widget properties on the test window and its children,
-    and uploads snapshots. The widgets are returned in the same state
-    that they had before.
-
-    Call this helper after setting up the test window.
-*/
-void tst_Widgets::takeStandardSnapshots()
-{
-    makeVisible();
-    struct PublicWidget : QWidget { friend tst_Widgets; };
-
-    QBASELINE_CHECK(takeSnapshot(), "default");
-
-    // try hard to set focus
-    static_cast<PublicWidget*>(window)->focusNextPrevChild(true);
-    if (!window->focusWidget()) {
-        QWidget *firstChild = window->findChild<QWidget*>();
-        if (firstChild)
-            firstChild->setFocus();
-    }
-    if (window->focusWidget()) {
-        QBASELINE_CHECK(takeSnapshot(), "focused");
-        window->focusWidget()->clearFocus();
-    }
-
-    // this disables all children
-    window->setEnabled(false);
-    QBASELINE_CHECK(takeSnapshot(), "disabled");
-    window->setEnabled(true);
-
-    // show and activate another window so that our test window becomes inactive
-    QWidget otherWindow;
-    otherWindow.move(window->geometry().bottomRight() + QPoint(10, 10));
-    otherWindow.resize(50, 50);
-    otherWindow.setWindowFlags(Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
-    otherWindow.show();
-    otherWindow.windowHandle()->requestActivate();
-    QVERIFY(QTest::qWaitForWindowActive(&otherWindow));
-    QBASELINE_CHECK(takeSnapshot(), "inactive");
-
-    window->windowHandle()->requestActivate();
-    QVERIFY(QTest::qWaitForWindowActive(window));
-    if (window->focusWidget())
-        window->focusWidget()->clearFocus();
-}
-
-void tst_Widgets::cleanup()
-{
-    delete window;
-    window = nullptr;
-}
-
 void tst_Widgets::tst_QSlider_data()
 {
     QTest::addColumn<Qt::Orientation>("orientation");
@@ -221,7 +78,7 @@ void tst_Widgets::tst_QSlider()
     }
     const auto sliders = _sliders;
 
-    window->setLayout(box);
+    testWindow()->setLayout(box);
 
     // we want to see sliders with different values
     int value = 0;