158 lines
4.2 KiB
C++
158 lines
4.2 KiB
C++
/*
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* Copyright 2007 by Matias Valdenegro T. <mvaldenegro@informatica.utem.cl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License version 2 as
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* published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __LAYOUT_ITEM__
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#define __LAYOUT_ITEM__
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#include <QtCore/QRectF>
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#include <QtCore/QSizeF>
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#include <plasma/plasma_export.h>
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class QGraphicsItem;
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namespace Plasma
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{
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class Layout;
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/**
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* Base class for Plasma layout-managed items
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*
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* @author Matias Valdenegro T. <mvaldenegro@informatica.utem.cl>
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*
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* All layout-managed items should implement this class, but regular users just need to use
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* Plasma::Widget and Plasma::Layout.
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*/
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class PLASMA_EXPORT LayoutItem
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{
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public:
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/**
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* Constructor.
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*/
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explicit LayoutItem();
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/**
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* Virtual Destructor.
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*/
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virtual ~LayoutItem();
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/**
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* Returns a bitmask with the directions that this Item can be expanded.
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*/
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virtual Qt::Orientations expandingDirections() const = 0;
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/**
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* Returns the minimum size of this Item and it's contents.
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*/
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virtual QSizeF minimumSize() const = 0;
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/**
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* Returns the maximum size of this Item.
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*/
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virtual QSizeF maximumSize() const = 0;
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/**
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* Returns true whatever this Item can use height-for-width layout management,
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* false otherwise.
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*/
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virtual bool hasHeightForWidth() const;
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/**
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* Returns the corresponding height for a given width.
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* @param w Width
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*/
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virtual qreal heightForWidth(qreal w) const;
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/**
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* Returns true whatever this Item can use width-for-height layout management,
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* false otherwise.
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*/
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virtual bool hasWidthForHeight() const;
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/**
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* Returns the corresponding width for a given height.
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* @param h Height
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*/
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virtual qreal widthForHeight(qreal h) const;
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/**
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* Returns the geometry of this Item.
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*/
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virtual QRectF geometry() const = 0;
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/**
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* Sets the geometry of this Item.
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*/
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virtual void setGeometry(const QRectF& geometry) = 0;
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/**
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* Returns the most appropriate size of this Item to hold whatever contents it has.
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*/
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virtual QSizeF sizeHint() const = 0;
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/**
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* Sets the layout that will manage children items
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*
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* @param layout The Layout that this LayoutItem will be managed by.
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*/
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void setLayout(Layout* layout);
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/**
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* @return the layout this item is currently associated with.
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*/
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Layout* layout() const;
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/**
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* Sets the layout that manages this item's geometry
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*
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* @param layout the layout that manage this item's geometry
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**/
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void setManagingLayout(Layout* layout);
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/**
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* Resets the layout that manges this item's geometry if it is the
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* currently associated layout
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*
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* @param layout to unset
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**/
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void unsetManagingLayout(Layout* layout);
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/**
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* @return the layout that manages this item's geometry, or 0 if none
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**/
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Layout* managingLayout() const;
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/**
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* Returns the graphics item associated with this layout item or 0
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* if there is no associated graphics item.
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*
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* The default implementation returns 0.
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*/
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virtual QGraphicsItem* graphicsItem();
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private:
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class Private;
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Private *const d;
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};
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}
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#endif /* __LAYOUT_ITEM__ */
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