QTfrontend/ui/qaspectratiolayout.h
author nemo
Wed, 16 Nov 2011 16:36:17 -0500
changeset 6390 3807d4cad077
parent 6060 fdfc01419815
child 6616 f77bb02b669f
permissions -rw-r--r--
This should have been added before. add log spew if this ever happens. We should hopefully identify the various circumstances and make sure it is all cleaned up so the list becomes unnecessary.
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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_ */