Add a manual styles test.

Task-number: QTBUG-49374
Task-number: QTBUG-52622
Change-Id: Ic205590725780147aec3abc0f4be2058d001d358
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>

tests/manual/widgets/styles/main.cpp

@@ -0,0 +1,232 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QAction>
+#include <QApplication>
+#include <QDebug>
+#include <QGridLayout>
+#include <QLabel>
+#include <QMainWindow>
+#include <QMenu>
+#include <QMenuBar>
+#include <QPalette>
+#include <QPixmap>
+#include <QPlainTextEdit>
+#include <QStyle>
+#include <QTabWidget>
+#include <QTextStream>
+#include <QVBoxLayout>
+#include <QWindow>
+#include <QScreen>
+
+// Format enumeration value and strip off the class name
+// added by QDebug: "QStyle::StandardPixmap(SP_Icon)" -> "SP_Icon".
+template <typename Enum>
+static inline QString formatEnumValue(Enum value)
+{
+    QString result;
+    QDebug(&result) << value;
+    int index = result.indexOf(QLatin1Char('('));
+    if (index > 0) { // "QStyle::StandardPixmap(..)".
+        result.remove(0, index + 1);
+        index = result.lastIndexOf(QLatin1Char(')'));
+        if (index > 0)
+            result.truncate(index);
+    }
+    return result;
+}
+
+static QString pixmapDescription(QStyle::StandardPixmap sp, const QPixmap &pixmap)
+{
+    QString description = formatEnumValue(sp);
+    QTextStream str(&description);
+    str << '(' << int(sp) << ") ";
+    if (pixmap.isNull()) {
+        str << "(null)";
+    } else {
+        const qreal dpr = pixmap.devicePixelRatioF();
+        str << ' ' << pixmap.width() << 'x' << pixmap.height();
+        if (!qFuzzyCompare(dpr, qreal(1)))
+            str << " DPR=" << dpr;
+    }
+    return description;
+}
+
+// Display pixmaps returned by QStyle::standardPixmap() in a grid.
+static QWidget *createStandardPixmapPage(QWidget *parent)
+{
+    QWidget *result = new QWidget(parent);
+    QGridLayout *grid = new QGridLayout(result);
+    int row = 0;
+    int column = 0;
+    const int maxColumns = 6;
+    for (int i = 0; i <= int(QStyle::SP_LineEditClearButton); ++i) {
+        const QStyle::StandardPixmap sp = static_cast<QStyle::StandardPixmap>(i);
+        QPixmap pixmap = result->style()->standardPixmap(sp, Q_NULLPTR, result);
+        QLabel *descriptionLabel = new QLabel(pixmapDescription(sp, pixmap));
+        grid->addWidget(descriptionLabel, row, column++);
+        QLabel *displayLabel = new QLabel;
+        displayLabel->setPixmap(pixmap);
+        displayLabel->setFrameShape(QFrame::Box);
+        grid->addWidget(displayLabel, row, column++);
+        if (column >= maxColumns) {
+            ++row;
+            column = 0;
+        }
+    }
+    return result;
+}
+
+// Display values returned by QStyle::pixelMetric().
+static QWidget *createMetricsPage(QWidget *parent)
+{
+    QPlainTextEdit *result = new QPlainTextEdit(parent);
+    QString text;
+    QTextStream str(&text);
+    for (int i = 0; i <= int(QStyle::PM_HeaderDefaultSectionSizeVertical); ++i) {
+        const QStyle::PixelMetric m = static_cast<QStyle::PixelMetric>(i);
+        str << formatEnumValue(m) << '(' << int(m) << ")="
+            << result->style()->pixelMetric(m, Q_NULLPTR, result) << '\n';
+    }
+    result->setPlainText(text);
+    return result;
+}
+
+// Display values returned by QStyle::styleHint()
+static QWidget *createHintsPage(QWidget *parent)
+{
+    QPlainTextEdit *result = new QPlainTextEdit(parent);
+    QString text;
+    QTextStream str(&text);
+    for (int i = 0; i <= int(QStyle::SH_Menu_SubMenuDontStartSloppyOnLeave); ++i) {
+        const QStyle::StyleHint h = static_cast<QStyle::StyleHint>(i);
+        str << formatEnumValue(h) << '(' << int(h) << ")="
+            << result->style()->styleHint(h, Q_NULLPTR, result) << '\n';
+    }
+    result->setPlainText(text);
+    return result;
+}
+
+// Display palette colors
+static QWidget *createColorsPage(QWidget *parent)
+{
+    QWidget *result = new QWidget(parent);
+    QGridLayout *grid = new QGridLayout;
+    const QPalette palette = QGuiApplication::palette();
+    int row = 0;
+    for (int r = 0; r < int(QPalette::NColorRoles); ++r) {
+        const QPalette::ColorRole role = static_cast<QPalette::ColorRole>(r);
+        const QColor color = palette.color(QPalette::Active, role);
+        if (color.isValid()) {
+            const QString description =
+                formatEnumValue(role) + QLatin1Char('(') + QString::number(r)
+                + QLatin1String(") ") + color.name(QColor::HexArgb);
+            grid->addWidget(new QLabel(description), row, 0);
+            QLabel *displayLabel = new QLabel;
+            QPixmap pixmap(20, 20);
+            pixmap.fill(color);
+            displayLabel->setPixmap(pixmap);
+            displayLabel->setFrameShape(QFrame::Box);
+            grid->addWidget(displayLabel, row, 1);
+            ++row;
+        }
+    }
+    QHBoxLayout *hBox = new QHBoxLayout;
+    hBox->addLayout(grid);
+    hBox->addStretch();
+    QVBoxLayout *vBox = new QVBoxLayout(result);
+    vBox->addLayout(hBox);
+    vBox->addStretch();
+    return result;
+}
+
+class MainWindow : public QMainWindow {
+    Q_OBJECT
+public:
+    MainWindow();
+
+public slots:
+    void updateDescription();
+
+private:
+    QTabWidget *m_tabWidget;
+    QLabel *m_descriptionLabel;
+};
+
+MainWindow::MainWindow()
+    : m_tabWidget(new QTabWidget)
+    , m_descriptionLabel(new QLabel)
+{
+    QMenu *fileMenu = menuBar()->addMenu("&File");
+    QAction *a = fileMenu->addAction("Quit", this, &QWidget::close);
+    a->setShortcut(Qt::CTRL + Qt::Key_Q);
+
+    QWidget *central = new QWidget;
+    QVBoxLayout *mainLayout = new QVBoxLayout(central);
+    mainLayout->addWidget(m_descriptionLabel);
+    mainLayout->addWidget(m_tabWidget);
+    m_tabWidget->addTab(createStandardPixmapPage(m_tabWidget), "Standard Pixmaps");
+    m_tabWidget->addTab(createHintsPage(m_tabWidget), "Hints");
+    m_tabWidget->addTab(createMetricsPage(m_tabWidget), "Pixel Metrics");
+    m_tabWidget->addTab(createColorsPage(m_tabWidget), "Colors");
+    setCentralWidget(central);
+
+    setWindowTitle(QLatin1String("Style Tester (Qt") + QLatin1String(QT_VERSION_STR)
+                   + QLatin1String(", ") + style()->objectName() + QLatin1Char(')'));
+}
+
+void MainWindow::updateDescription()
+{
+    QString text;
+    QTextStream str(&text);
+    str << "Qt " << QT_VERSION_STR << ", platform: " << QGuiApplication::platformName()
+        << ", Style: \"" << style()->objectName() << "\", DPR=" << devicePixelRatioF()
+        << ' ' << logicalDpiX() << ',' << logicalDpiY() << "DPI";
+    if (const QWindow *w = windowHandle())
+        str << ", Screen: \"" << w->screen()->name() << '"';
+    m_descriptionLabel->setText(text);
+}
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+    QApplication app(argc, argv);
+    MainWindow mw;
+    mw.show();
+    mw.updateDescription();
+    QObject::connect(mw.windowHandle(), &QWindow::screenChanged,
+                     &mw, &MainWindow::updateDescription);
+    return app.exec();
+}
+
+#include "main.moc"

tests/manual/widgets/styles/styles.pro

@@ -0,0 +1,7 @@
+TEMPLATE = app
+QT = widgets
+CONFIG += console
+CONFIG -= app_bundle
+CONFIG += c++11
+
+SOURCES += main.cpp

tests/manual/widgets/widgets.pro

@@ -1,3 +1,3 @@
 TEMPLATE = subdirs
 SUBDIRS = itemviews qgraphicsview kernel
-
+greaterThan(QT_MAJOR_VERSION, 4): SUBDIRS += styles