QTfrontend/qaspectratiolayout.cpp
author nemo
Sun, 04 Sep 2011 12:34:43 -0400
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parent 4520 e7882bd1a894
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/*
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 * Copyright (c) 2009 Nokia Corporation.
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 */
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#include "qaspectratiolayout.h"
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QAspectRatioLayout::QAspectRatioLayout(QWidget* parent, int spacing) : QLayout(parent) {
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        init(spacing);
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}
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QAspectRatioLayout::QAspectRatioLayout(int spacing) {
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        init(spacing);
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}
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QAspectRatioLayout::~QAspectRatioLayout() {
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        delete item;
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        delete lastReceivedRect;
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        delete _geometry;
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}
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void QAspectRatioLayout::init(int spacing) {
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        item = 0;
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        lastReceivedRect = new QRect(0, 0, 0, 0);
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        _geometry = new QRect(0, 0, 0, 0);
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        setSpacing(spacing);
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}
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/* Adds item if place isn't already taken. */
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void QAspectRatioLayout::add(QLayoutItem* item) {
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        if(!hasItem()) {
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                replaceItem(item);
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        }
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}
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/* Adds item if place isn't already taken. */
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void QAspectRatioLayout::addItem(QLayoutItem* item) {
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        if(!hasItem()) {
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                replaceItem(item);
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        }
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}
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/* Adds widget if place isn't already taken. */
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void QAspectRatioLayout::addWidget(QWidget* widget) {
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        if(!hasItem()) {
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                replaceItem(new QWidgetItem(widget));
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        }
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}
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/* Returns the item pointer and dereferences it here. */
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QLayoutItem* QAspectRatioLayout::take() {
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        QLayoutItem* item = 0;
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        if(this->hasItem()) {
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                item = this->item;
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                this->item = 0;
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        }
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        return item;
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}
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/* Returns the item pointer and dereferences it here. */
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QLayoutItem* QAspectRatioLayout::takeAt(int index) {
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        if(index != 0) {
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                return 0;
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        }
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        return this->take();
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}
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/* Returns the item pointer. */
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QLayoutItem* QAspectRatioLayout::itemAt(int index) const {
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        if(index != 0) {
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                return 0;
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        }
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        if(hasItem()) {
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                return this->item;
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        }
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        return 0;
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}
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/* Checks if we have an item. */
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bool QAspectRatioLayout::hasItem() const {
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        return this->item != 0;
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}
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/* Returns the count of items which can be either 0 or 1. */
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int QAspectRatioLayout::count() const {
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        int returnValue = 0;
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        if(hasItem()) {
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                returnValue = 1;
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        }
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        return returnValue;
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}
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/* Replaces the item with the new and returns the old. */
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QLayoutItem* QAspectRatioLayout::replaceItem(QLayoutItem* item) {
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        QLayoutItem* old = 0;
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        if(this->hasItem()) {
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                old = this->item;
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        }
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        this->item = item;
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        setGeometry(*this->_geometry);
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        return old;
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}
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/* Tells which way layout expands. */
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Qt::Orientations QAspectRatioLayout::expandingDirections() const {
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        return Qt::Horizontal | Qt::Vertical;
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}
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/* Tells which size is preferred. */
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QSize QAspectRatioLayout::sizeHint() const {
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        return this->item->minimumSize();
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}
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/* Tells minimum size. */
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QSize QAspectRatioLayout::minimumSize() const {
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        return this->item->minimumSize();
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}
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/*
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 * Tells if heightForWidth calculations is handled.
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 * It isn't since width isn't enough to calculate
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 * proper size.
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 */
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bool QAspectRatioLayout::hasHeightForWidth() const {
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        return false;
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}
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/* Replaces lastReceivedRect. */
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void QAspectRatioLayout::setLastReceivedRect(const QRect& rect) {
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        QRect* oldRect = this->lastReceivedRect;
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        this->lastReceivedRect = new QRect(rect.topLeft(), rect.size());
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        delete oldRect;
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}
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/* Returns geometry */
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QRect QAspectRatioLayout::geometry() {
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        return QRect(*this->_geometry);
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}
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/* Sets geometry to given size. */
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void QAspectRatioLayout::setGeometry(const QRect& rect) {
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        /*
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         * We check if the item is set and
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         * if size is the same previously received.
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         * If either is false nothing is done.
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         */
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        if(!this->hasItem() ||
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           areRectsEqual(*this->lastReceivedRect, rect)) {
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                return;
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        }
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        /* Replace the last received rectangle. */
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        setLastReceivedRect(rect);
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        /* Calculate proper size for the item relative to the received size. */
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        QSize properSize = calculateProperSize(rect.size());
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        /* Calculate center location in the rect and with item size. */
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        QPoint properLocation = calculateCenterLocation(rect.size(), properSize);
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        /* Set items geometry */
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        this->item->setGeometry(QRect(properLocation, properSize));
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        QRect* oldRect = this->_geometry;
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        /* Cache the calculated geometry. */
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        this->_geometry = new QRect(properLocation, properSize);
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        delete oldRect;
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        /* Super classes setGeometry */
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        QLayout::setGeometry(*this->_geometry);
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}
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/* Takes the shortest side and creates QSize
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 * with the shortest side as width and height. */
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QSize QAspectRatioLayout::calculateProperSize(QSize from) const {
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        QSize properSize;
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        if(from.height() * 2 < from.width()) {
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                properSize.setHeight(from.height() - this->margin());
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                properSize.setWidth(from.height() * 2 - this->margin());
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        }
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        else {
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                properSize.setWidth(from.width() - this->margin());
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                properSize.setHeight(from.width() / 2 - this->margin());
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        }
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        return properSize;
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}
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/* Calculates center location from the given height and width for item size. */
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QPoint QAspectRatioLayout::calculateCenterLocation(QSize from,
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                                                   QSize itemSize) const {
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        QPoint centerLocation;
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        if((from.width() - itemSize.width()) > 0) {
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                centerLocation.setX((from.width() - itemSize.width())/2);
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        }
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        if((from.height() - itemSize.height()) > 0) {
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                centerLocation.setY((from.height() - itemSize.height())/2);
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        }
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        return centerLocation;
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}
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/* Compares if two QRects are equal. */
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bool QAspectRatioLayout::areRectsEqual(const QRect& a,
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                                       const QRect& b) const {
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        bool result = false;
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        if(a.x() == b.x() &&
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           a.y() == b.y() &&
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           a.height() == b.height() &&
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           a.width() == b.width()) {
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                result = true;
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        }
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        return result;
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}