QTfrontend/ui/qaspectratiolayout.cpp
author Xeli
Sat, 11 Feb 2012 14:30:15 +0100
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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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{
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    init(spacing);
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}
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QAspectRatioLayout::QAspectRatioLayout(int spacing)
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{
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    init(spacing);
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}
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QAspectRatioLayout::~QAspectRatioLayout()
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{
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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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{
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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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{
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    if(!hasItem())
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    {
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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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{
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    if(!hasItem())
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    {
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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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{
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    if(!hasItem())
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    {
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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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{
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    QLayoutItem* item = 0;
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    if(this->hasItem())
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    {
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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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{
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    if(index != 0)
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    {
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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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{
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    if(index != 0)
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    {
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        return 0;
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    }
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    if(hasItem())
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    {
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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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{
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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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{
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    int returnValue = 0;
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    if(hasItem())
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    {
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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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{
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    QLayoutItem* old = 0;
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    if(this->hasItem())
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    {
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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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{
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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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{
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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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{
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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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{
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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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{
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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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{
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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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    /*
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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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    {
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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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{
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    QSize properSize;
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    if(from.height() * 2 < from.width())
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    {
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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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    {
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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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{
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    QPoint centerLocation;
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    if((from.width() - itemSize.width()) > 0)
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    {
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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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    {
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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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{
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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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    {
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        result = true;
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    }
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    return result;
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}