Benchmark for layout hierarchies

(cherry picked from commit cb503a3f4901c0b017374f099b0de8c0c4c50648)

tests/benchmarks/gui/graphicsview/graphicsview.pro

@@ -3,6 +3,7 @@ SUBDIRS = \
         functional \
         qgraphicsanchorlayout \
         qgraphicsitem \
+        qgraphicslayout \
         qgraphicsscene \
         qgraphicsview \
         qgraphicswidget

tests/benchmarks/gui/graphicsview/qgraphicslayout/qgraphicslayout.pro

@@ -0,0 +1,6 @@
+load(qttest_p4)
+TEMPLATE = app
+TARGET = tst_bench_qgraphicslayout
+
+SOURCES += tst_qgraphicslayout.cpp
+

tests/benchmarks/gui/graphicsview/qgraphicslayout/tst_qgraphicslayout.cpp

@@ -0,0 +1,153 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/QtTest>
+#include <QtGui/qgraphicslayout.h>
+#include <QtGui/qgraphicslinearlayout.h>
+#include <QtGui/qgraphicswidget.h>
+#include <QtGui/qgraphicsview.h>
+
+class tst_QGraphicsLayout : public QObject
+{
+    Q_OBJECT
+public:
+    tst_QGraphicsLayout() {}
+    ~tst_QGraphicsLayout() {}
+
+private slots:
+    void invalidate();
+};
+
+
+class RectWidget : public QGraphicsWidget
+{
+public:
+    RectWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0) : QGraphicsWidget(parent, wFlags), setGeometryCalls(0) {}
+
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+    {
+        Q_UNUSED(option);
+        Q_UNUSED(widget);
+        painter->drawRoundRect(rect());
+        painter->drawLine(rect().topLeft(), rect().bottomRight());
+        painter->drawLine(rect().bottomLeft(), rect().topRight());
+    }
+
+    void setGeometry(const QRectF &rect)
+    {
+        //qDebug() << "setGeometry():" << this->data(0).toString();
+        setGeometryCalls->insert(this, rect);
+        QGraphicsWidget::setGeometry(rect);
+    }
+
+    void callUpdateGeometry() {
+        QGraphicsWidget::updateGeometry();
+    }
+
+    QMap<RectWidget*, QRectF> *setGeometryCalls;
+};
+
+/**
+ * Test to see how much time is needed to resize all widgets in a
+ * layout-widget-layout-widget-.... hierarchy from the point where a
+ * leaf widget changes its size hint. (updateGeometry() is called).
+ *
+ * If you run the test for 4.7 you'll get some really high numbers, but
+ * that's because they also include painting (and possible processing of
+ * some other events).
+ */
+void tst_QGraphicsLayout::invalidate()
+{
+    QGraphicsLayout::setInstantInvalidatePropagation(true);
+    QGraphicsScene scene;
+    QGraphicsView *view = new QGraphicsView(&scene);
+    QMap<RectWidget*, QRectF> setGeometryCalls;
+
+    RectWidget *window = new RectWidget(0, Qt::Window);
+    window->setGeometryCalls = &setGeometryCalls;
+    window->setData(0, QString(QChar('a')));
+
+    scene.addItem(window);
+    RectWidget *leaf = 0;
+    const int depth = 100;
+    RectWidget *parent = window;
+    for (int i = 1; i < depth; ++i) {
+        QGraphicsLinearLayout *l = new QGraphicsLinearLayout(parent);
+        l->setContentsMargins(0,0,0,0);
+        RectWidget *child = new RectWidget;
+        child->setData(0, QString(QChar('a' + i)));
+        child->setGeometryCalls = &setGeometryCalls;
+        l->addItem(child);
+        parent = child;
+    }
+    leaf = parent;
+    leaf->setMinimumSize(QSizeF(1,1));
+
+    view->show();
+
+    QTest::qWaitForWindowShown(view);
+
+    // ...then measure...
+
+    int pass = 1;
+
+    // should be as small as possible, to reduce overhead of painting
+    QSizeF size(1, 1);
+    setGeometryCalls.clear();
+    QBENCHMARK {
+        leaf->setMinimumSize(size);
+        leaf->setMaximumSize(size);
+        while (setGeometryCalls.count() < depth) {
+            QApplication::sendPostedEvents();
+        }
+        // force a resize on each widget, this will ensure
+        // that each iteration will resize all 50 widgets
+        int w = int(size.width());
+        w^=2;
+        size.setWidth(w);
+    }
+    delete view;
+    QGraphicsLayout::setInstantInvalidatePropagation(false);
+}
+
+QTEST_MAIN(tst_QGraphicsLayout)
+
+#include "tst_qgraphicslayout.moc"