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#include <qtest.h>

#include <QtGui>

class tst_QWidget : public QObject

{

    Q_OBJECT

private slots:

    void update_data();

    void updateOpaque_data();

    void updateOpaque();

    void updateTransparent_data();

    void updateTransparent();

    void updatePartial_data();

    void updatePartial();

    void updateComplex_data();

    void updateComplex();

    void complexToplevelResize();

};

class UpdateWidget : public QWidget

{

public:

    UpdateWidget(int rows, int columns) : QWidget(0)

    {

        QGridLayout *layout = new QGridLayout;

        for (int row = 0; row < rows; ++row) {

            for (int column = 0; column < columns; ++column) {

                UpdateWidget *widget = new UpdateWidget;

                widget->setFixedSize(20, 20);

                layout->addWidget(widget, row, column);

                children.append(widget);

            }

        }

        setLayout(layout);

    }

    UpdateWidget(QWidget *parent = 0) : QWidget(parent) {}

    void paintEvent(QPaintEvent *)

    {

        static int color = Qt::black;

        QPainter painter(this);

        painter.fillRect(rect(), Qt::GlobalColor(color));

        if (++color > Qt::darkYellow)

            color = Qt::black;

    }

    QRegion updateRegion;

    QList<UpdateWidget*> children;

};

void tst_QWidget::update_data()

{

    QTest::addColumn<int>("rows");

    QTest::addColumn<int>("columns");

    QTest::addColumn<int>("numUpdates");

    QTest::newRow("10x10x1") << 10 << 10 << 1;

    QTest::newRow("10x10x10") << 10 << 10 << 10;

    QTest::newRow("25x25x1") << 25 << 25 << 1;

    QTest::newRow("25x25x10") << 25 << 25 << 10;

    QTest::newRow("25x25x100") << 25 << 25 << 100;

}

void tst_QWidget::updateOpaque_data()

{

    update_data();

}

void tst_QWidget::updateOpaque()

{

    QFETCH(int, rows);

    QFETCH(int, columns);

    QFETCH(int, numUpdates);

    UpdateWidget widget(rows, columns);

    foreach (QWidget *w, widget.children) {

        w->setAttribute(Qt::WA_OpaquePaintEvent);

    }

    widget.show();

    QApplication::processEvents();

    int i = 0;

    const int n = widget.children.size();

    QBENCHMARK {

        for (int j = 0; j < numUpdates; ++j) {

            widget.children[i]->update();

            QApplication::processEvents();

            i = (i + 1) % n;

        }

    }

}

void tst_QWidget::updateTransparent_data()

{

    update_data();

}

void tst_QWidget::updateTransparent()

{

    QFETCH(int, rows);

    QFETCH(int, columns);

    QFETCH(int, numUpdates);

    UpdateWidget widget(rows, columns);

    widget.show();

    QApplication::processEvents();

    int i = 0;

    const int n = widget.children.size();

    QBENCHMARK {

        for (int j = 0; j < numUpdates; ++j) {

            widget.children[i]->update();

            QApplication::processEvents();

            i = (i + 1) % n;

        }

    }

}

void tst_QWidget::updatePartial_data()

{

    update_data();

}

void tst_QWidget::updatePartial()

{

    QFETCH(int, rows);

    QFETCH(int, columns);

    QFETCH(int, numUpdates);

    UpdateWidget widget(rows, columns);

    widget.show();

    QApplication::processEvents();

    int i = 0;

    const int n = widget.children.size();

    QBENCHMARK {

        for (int j = 0; j < numUpdates; ++j) {

            QWidget *w = widget.children[i];

            const int x = w->width() / 2;

            const int y = w->height() / 2;

            w->update(0, 0, x, y);

            w->update(x, 0, x, y);

            w->update(0, y, x, y);

            w->update(x, y, x, y);

            QApplication::processEvents();

            i = (i + 1) % n;

        }

    }

}

void tst_QWidget::updateComplex_data()

{

    update_data();

}

void tst_QWidget::updateComplex()

{

    QFETCH(int, rows);

    QFETCH(int, columns);

    QFETCH(int, numUpdates);

    UpdateWidget widget(rows, columns);

    widget.show();

    QApplication::processEvents();

    int i = 0;

    const int n = widget.children.size();

    QBENCHMARK {

        for (int j = 0; j < numUpdates; ++j) {

            QWidget *w = widget.children[i];

            const int x = w->width() / 2;

            const int y = w->height() / 2;

            w->update(QRegion(0, 0, x, y, QRegion::Ellipse));

            w->update(QRegion(x, y, x, y, QRegion::Ellipse));

            QApplication::processEvents();

            i = (i + 1) % n;

        }

    }

}

class ResizeWidget : public QWidget

{

public:

    ResizeWidget();

};

ResizeWidget::ResizeWidget() : QWidget(0)

{

    QBoxLayout *topLayout = new QVBoxLayout;

    QMenuBar *menubar = new QMenuBar;

    QMenu* popup = menubar->addMenu("&File");

    popup->addAction("&Quit", qApp, SLOT(quit()));

    topLayout->setMenuBar(menubar);

    QBoxLayout *buttons = new QHBoxLayout;

    buttons->setMargin(5);

    buttons->addStretch(10);

    for (int i = 1; i <= 4; i++ ) {

        QPushButton* button = new QPushButton;

        button->setText(QString("Button %1").arg(i));

        buttons->addWidget(button);

    }

    topLayout->addLayout(buttons);

    buttons = new QHBoxLayout;

    buttons->addStretch(10);

    for (int i = 11; i <= 16; i++) {

        QPushButton* button = new QPushButton;

        button->setText(QString("Button %1").arg(i));

        buttons->addWidget(button);

    }

    topLayout->addLayout(buttons);

    QBoxLayout *buttons2 = new QHBoxLayout;

    buttons2->addStretch(10);

    topLayout->addLayout(buttons2);

    QPushButton *button = new QPushButton;

    button->setText("Button five");

    buttons2->addWidget(button);

    button = new QPushButton;

    button->setText("Button 6");

    buttons2->addWidget(button);

    QTextEdit *bigWidget = new QTextEdit;

    bigWidget->setText("This widget will get all the remaining space");

    bigWidget->setFrameStyle(QFrame::Panel | QFrame::Plain);

    topLayout->addWidget(bigWidget);

    const int numRows = 6;

    const int labelCol = 0;

    const int linedCol = 1;

    const int multiCol = 2;

    QGridLayout *grid = new QGridLayout;

    for (int row = 0; row < numRows; row++) {

        QLineEdit *lineEdit = new QLineEdit;

        grid->addWidget(lineEdit, row, linedCol);

        QLabel *label = new QLabel(QString("Line &%1").arg(row + 1));

        grid->addWidget(label, row, labelCol);

    }

    topLayout->addLayout(grid);

    QTextEdit *multiLineEdit = new QTextEdit;

    grid->addWidget(multiLineEdit, 0, labelCol + 1, multiCol, multiCol);

    grid->setColumnStretch(linedCol, 10);

    grid->setColumnStretch(multiCol, 20);

    QLabel* statusBar = new QLabel;

    statusBar->setText("Let's pretend this is a status bar");

    statusBar->setFrameStyle(QFrame::Panel | QFrame::Sunken);

    statusBar->setFixedHeight(statusBar->sizeHint().height());

    statusBar->setAlignment(Qt::AlignVCenter | Qt::AlignLeft);

    topLayout->addWidget(statusBar);

    topLayout->activate();

    setLayout(topLayout);

}

void tst_QWidget::complexToplevelResize()

{

    ResizeWidget w;

    w.show();

    QApplication::processEvents();

    const int minSize = 100;

    const int maxSize = 800;

    int size = minSize;

    QBENCHMARK {

        w.resize(size, size);

        size = qMax(minSize, (size + 10) % maxSize);

        QApplication::processEvents();

        QApplication::processEvents();

    }

}

QTEST_MAIN(tst_QWidget)

#include "tst_qwidget.moc"