--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/qaspectratiolayout.cpp	Mon Dec 13 22:12:30 2010 +0300
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2009 Nokia Corporation.
+ */
+
+#include "qaspectratiolayout.h"
+
+QAspectRatioLayout::QAspectRatioLayout(QWidget* parent, int spacing) : QLayout(parent) {
+        init(spacing);
+}
+
+QAspectRatioLayout::QAspectRatioLayout(int spacing) {
+        init(spacing);
+}
+
+QAspectRatioLayout::~QAspectRatioLayout() {
+        delete item;
+        delete lastReceivedRect;
+        delete _geometry;
+}
+
+void QAspectRatioLayout::init(int spacing) {
+        item = 0;
+        lastReceivedRect = new QRect(0, 0, 0, 0);
+        _geometry = new QRect(0, 0, 0, 0);
+        setSpacing(spacing);
+}
+
+
+/* Adds item if place isn't already taken. */
+void QAspectRatioLayout::add(QLayoutItem* item) {
+        if(!hasItem()) {
+                replaceItem(item);
+        }
+}
+
+/* Adds item if place isn't already taken. */
+void QAspectRatioLayout::addItem(QLayoutItem* item) {
+        if(!hasItem()) {
+                replaceItem(item);
+        }
+}
+
+/* Adds widget if place isn't already taken. */
+void QAspectRatioLayout::addWidget(QWidget* widget) {
+        if(!hasItem()) {
+                replaceItem(new QWidgetItem(widget));
+        }
+}
+
+/* Returns the item pointer and dereferences it here. */
+QLayoutItem* QAspectRatioLayout::take() {
+        QLayoutItem* item = 0;
+        if(this->hasItem()) {
+                item = this->item;
+                this->item = 0;
+        }
+        return item;
+}
+
+/* Returns the item pointer and dereferences it here. */
+QLayoutItem* QAspectRatioLayout::takeAt(int index) {
+        if(index != 0) {
+                return 0;
+        }
+        return this->take();
+}
+
+/* Returns the item pointer. */
+QLayoutItem* QAspectRatioLayout::itemAt(int index) const {
+        if(index != 0) {
+                return 0;
+        }
+        if(hasItem()) {
+                return this->item;
+        }
+        return 0;
+}
+
+/* Checks if we have an item. */
+bool QAspectRatioLayout::hasItem() const {
+        return this->item != 0;
+}
+
+/* Returns the count of items which can be either 0 or 1. */
+int QAspectRatioLayout::count() const {
+        int returnValue = 0;
+        if(hasItem()) {
+                returnValue = 1;
+        }
+        return returnValue;
+}
+
+/* Replaces the item with the new and returns the old. */
+QLayoutItem* QAspectRatioLayout::replaceItem(QLayoutItem* item) {
+        QLayoutItem* old = 0;
+        if(this->hasItem()) {
+                old = this->item;
+        }
+        this->item = item;
+        setGeometry(*this->_geometry);
+        return old;
+}
+
+/* Tells which way layout expands. */
+Qt::Orientations QAspectRatioLayout::expandingDirections() const {
+        return Qt::Horizontal | Qt::Vertical;
+}
+
+/* Tells which size is preferred. */
+QSize QAspectRatioLayout::sizeHint() const {
+        return this->item->minimumSize();
+}
+
+/* Tells minimum size. */
+QSize QAspectRatioLayout::minimumSize() const {
+        return this->item->minimumSize();
+}
+
+/*
+ * Tells if heightForWidth calculations is handled.
+ * It isn't since width isn't enough to calculate
+ * proper size.
+ */
+bool QAspectRatioLayout::hasHeightForWidth() const {
+        return false;
+}
+
+/* Replaces lastReceivedRect. */
+void QAspectRatioLayout::setLastReceivedRect(const QRect& rect) {
+        QRect* oldRect = this->lastReceivedRect;
+        this->lastReceivedRect = new QRect(rect.topLeft(), rect.size());
+        delete oldRect;
+}
+
+/* Returns geometry */
+QRect QAspectRatioLayout::geometry() {
+        return QRect(*this->_geometry);
+}
+
+/* Sets geometry to given size. */
+void QAspectRatioLayout::setGeometry(const QRect& rect) {
+        /*
+         * We check if the item is set and
+         * if size is the same previously received.
+         * If either is false nothing is done.
+         */
+        if(!this->hasItem() ||
+           areRectsEqual(*this->lastReceivedRect, rect)) {
+                return;
+        }
+        /* Replace the last received rectangle. */
+        setLastReceivedRect(rect);
+        /* Calculate proper size for the item relative to the received size. */
+        QSize properSize = calculateProperSize(rect.size());
+        /* Calculate center location in the rect and with item size. */
+        QPoint properLocation = calculateCenterLocation(rect.size(), properSize);
+        /* Set items geometry */
+        this->item->setGeometry(QRect(properLocation, properSize));
+        QRect* oldRect = this->_geometry;
+        /* Cache the calculated geometry. */
+        this->_geometry = new QRect(properLocation, properSize);
+        delete oldRect;
+        /* Super classes setGeometry */
+        QLayout::setGeometry(*this->_geometry);
+}
+
+/* Takes the shortest side and creates QSize
+ * with the shortest side as width and height. */
+QSize QAspectRatioLayout::calculateProperSize(QSize from) const {
+        QSize properSize;
+        if(from.height() * 2 < from.width()) {
+                properSize.setHeight(from.height() - this->margin());
+                properSize.setWidth(from.height() * 2 - this->margin());
+        }
+        else {
+                properSize.setWidth(from.width() - this->margin());
+                properSize.setHeight(from.width() / 2 - this->margin());
+        }
+        return properSize;
+}
+
+/* Calculates center location from the given height and width for item size. */
+QPoint QAspectRatioLayout::calculateCenterLocation(QSize from,
+                                                   QSize itemSize) const {
+        QPoint centerLocation;
+        if((from.width() - itemSize.width()) > 0) {
+                centerLocation.setX((from.width() - itemSize.width())/2);
+        }
+        if((from.height() - itemSize.height()) > 0) {
+                centerLocation.setY((from.height() - itemSize.height())/2);
+        }
+        return centerLocation;
+}
+
+/* Compares if two QRects are equal. */
+bool QAspectRatioLayout::areRectsEqual(const QRect& a,
+                                       const QRect& b) const {
+        bool result = false;
+        if(a.x() == b.x() &&
+           a.y() == b.y() &&
+           a.height() == b.height() &&
+           a.width() == b.width()) {
+                result = true;
+        }
+        return result;
+}