tools/drawMapTest/qaspectratiolayout.h
author nemo
Mon, 17 Oct 2011 14:05:34 -0400
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permissions -rw-r--r--
never doing any graphics stuff when I can't test, again :(
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/*
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 * Copyright (c) 2009 Nokia Corporation.
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 */
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#ifndef QASPECTRATIOLAYOUT_H_
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#define QASPECTRATIOLAYOUT_H_
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#include <QLayout>
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#include <QPointer>
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#include <QRect>
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#include <QWidgetItem>
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#include <QLayoutItem>
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class QAspectRatioLayout : public QLayout
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{
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        Q_OBJECT
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public:
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        QAspectRatioLayout(QWidget* parent, int spacing =-1);
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        QAspectRatioLayout(int spacing = -1);
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        ~QAspectRatioLayout();
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        /* Convenience method */
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        virtual void add(QLayoutItem* item);
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/* http://doc.trolltech.com/qlayout.html#addItem */
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        virtual void addItem(QLayoutItem* item);
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        /* http://doc.trolltech.com/qlayout.html#addWidget */
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        virtual void addWidget(QWidget* widget);
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        /* http://doc.trolltech.com/qlayout.html#takeAt */
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        virtual QLayoutItem* takeAt(int index);
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        /* http://doc.trolltech.com/qlayout.html#itemAt */
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        virtual QLayoutItem* itemAt(int index) const;
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        /* http://doc.trolltech.com/qlayout.html#count */
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        virtual int count() const;
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        /*
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         * These are ours since we do have only one item.
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         */
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        virtual QLayoutItem* replaceItem(QLayoutItem* item);
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        virtual QLayoutItem* take();
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        virtual bool hasItem() const;
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/* http://doc.trolltech.com/qlayout.html#expandingDirections */
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        virtual Qt::Orientations expandingDirections() const;
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        /*
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         * This method contains most of the juice of this article.
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         * http://doc.trolltech.com/qlayoutitem.html#setGeometry
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         */
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        virtual void setGeometry(const QRect& rect);
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        /* http://doc.trolltech.com/qlayoutitem.html#geometry */
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        virtual QRect geometry();
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        /* http://doc.trolltech.com/qlayoutitem.html#sizeHint */
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        virtual QSize sizeHint() const;
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        /* http://doc.trolltech.com/qlayout.html#minimumSize */
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        virtual QSize minimumSize() const;
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        /* http://doc.trolltech.com/qlayoutitem.html#hasHeightForWidth */
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        virtual bool hasHeightForWidth() const;
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private:
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        /* Saves the last received rect. */
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        void setLastReceivedRect(const QRect& rect);
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        /* Used to initialize the object. */
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        void init(int spacing);
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        /* Calculates the maximum size for the item from the assigned size. */
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        QSize calculateProperSize(QSize from) const;
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        /* Calculates the center location from the assigned size and
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         * the items size. */
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        QPoint calculateCenterLocation(QSize from, QSize itemSize) const;
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        /* Check if two QRects are equal */
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        bool areRectsEqual(const QRect& a, const QRect& b) const;
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        /* Contains item reference */
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        QLayoutItem* item;
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        /*
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         * Used for caching so we won't do calculations every time
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         * setGeometry is called.
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         */
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        QRect* lastReceivedRect;
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        /* Contains geometry */
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        QRect* _geometry;
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63a21fac8bf7 Add QAspectRatioLayout borrowed from http://wiki.forum.nokia.com/index.php/CS001309_-_Maintaining_square_form_for_a_widget_in_Qt to maintain width == height * 2 aspect ratio for map drawing widget
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};
63a21fac8bf7 Add QAspectRatioLayout borrowed from http://wiki.forum.nokia.com/index.php/CS001309_-_Maintaining_square_form_for_a_widget_in_Qt to maintain width == height * 2 aspect ratio for map drawing widget
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63a21fac8bf7 Add QAspectRatioLayout borrowed from http://wiki.forum.nokia.com/index.php/CS001309_-_Maintaining_square_form_for_a_widget_in_Qt to maintain width == height * 2 aspect ratio for map drawing widget
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#endif /* QASPECTRATIOLAYOUT_H_ */