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#include <QtTest/QtTest>

#include <QScrollBar>

#include <QStyleOptionSlider>

#include <QScrollArea>

class tst_QScrollBar : public QObject

{

    Q_OBJECT

public slots:

    void initTestCase();

    void cleanupTestCase();

    void hideAndShow(int action);

private slots:

    void scrollSingleStep();

    void task_209492();

private:

    QScrollBar *testWidget;

};

void tst_QScrollBar::initTestCase()

{

    testWidget = new QScrollBar(Qt::Horizontal);

    testWidget->resize(100, testWidget->height());

    testWidget->show();

}

void tst_QScrollBar::cleanupTestCase()

{

    delete testWidget;

    testWidget = 0;

}

void tst_QScrollBar::hideAndShow(int)

{

    testWidget->hide();

    testWidget->show();

}

// Check that the scrollbar doesn't scroll after calling hide and show

// from a slot connected to the scrollbar's actionTriggered signal.

void tst_QScrollBar::scrollSingleStep()

{

    testWidget->setValue(testWidget->minimum());

    QCOMPARE(testWidget->value(), testWidget->minimum());

    connect(testWidget, SIGNAL(actionTriggered(int)), this, SLOT(hideAndShow(int)));

    // Get rect for the area to click on

    const QStyleOptionSlider opt = qt_qscrollbarStyleOption(testWidget);

    QRect sr = testWidget->style()->subControlRect(QStyle::CC_ScrollBar, &opt,

                                                   QStyle::SC_ScrollBarAddLine, testWidget);

    if (!sr.isValid())

        QSKIP("SC_ScrollBarAddLine not valid",  SkipAll);

    QTest::mouseClick(testWidget, Qt::LeftButton, Qt::NoModifier, QPoint(sr.x(), sr.y()));

    QTest::qWait(510); // initial delay is 500 for setRepeatAction

    disconnect(testWidget, SIGNAL(actionTriggered(int)), 0, 0);

    QCOMPARE(testWidget->value(), testWidget->singleStep());

}

void tst_QScrollBar::task_209492()

{

    class MyScrollArea : public QScrollArea

    {

    public:

        int scrollCount;

        MyScrollArea(QWidget *parent = 0) : QScrollArea(parent), scrollCount(0) {}

    protected:

        void paintEvent(QPaintEvent *) { QTest::qSleep(600); }

        void scrollContentsBy(int, int) { ++scrollCount; viewport()->update(); }

    };

    MyScrollArea scrollArea;

    QScrollBar *verticalScrollBar = scrollArea.verticalScrollBar();

    verticalScrollBar->setRange(0, 1000);

    scrollArea.show();

    QTest::qWait(300);

    QSignalSpy spy(verticalScrollBar, SIGNAL(actionTriggered(int)));

    QCOMPARE(scrollArea.scrollCount, 0);

    QCOMPARE(spy.count(), 0);

    // Simulate a mouse click on the "scroll down button".

    const QPoint pressPoint(verticalScrollBar->width() / 2, verticalScrollBar->height() - 10);

    const QPoint globalPressPoint = verticalScrollBar->mapToGlobal(globalPressPoint);

    QMouseEvent mousePressEvent(QEvent::MouseButtonPress, pressPoint, globalPressPoint,

                                Qt::LeftButton, Qt::LeftButton, 0);

    QApplication::sendEvent(verticalScrollBar, &mousePressEvent);

    QTest::qWait(50);

    QMouseEvent mouseReleaseEvent(QEvent::MouseButtonRelease, pressPoint, globalPressPoint,

                                  Qt::LeftButton, Qt::LeftButton, 0);

    QApplication::sendEvent(verticalScrollBar, &mouseReleaseEvent);

    // Check that the action was triggered once.

#ifdef Q_WS_MAC

    QEXPECT_FAIL("", "Fix does does not work on Mac due to paint architechure differences.", Abort);

#endif

    QCOMPARE(scrollArea.scrollCount, 1);

    QCOMPARE(spy.count(), 1);

}

QTEST_MAIN(tst_QScrollBar)

#include "tst_qscrollbar.moc"