253 lines
7.5 KiB
C++
253 lines
7.5 KiB
C++
/*
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* Copyright 2007 by Alexander Wiedenbruch <mail@wiedenbruch.de>
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* and Matias Valdenegro <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 WIDGET_H_
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#define WIDGET_H_
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#include <QtGui/QGraphicsItem>
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#include <QtCore/QRectF>
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#include <QtCore/QSizeF>
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#include <plasma/widgets/layoutitem.h>
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#include <plasma/plasma_export.h>
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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 all Widgets in Plasma.
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*
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* @author Alexander Wiedenbruch
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* @author Matias Valdenegro
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*
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* Widgets are the basis for User Interfaces inside Plasma.
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* Widgets are rectangular, but can be in any visible shape by just using transparency to mask
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* out non-rectangular areas.
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*
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* To implement a Widget, just subclass Plasma::Widget and implement at minimum, sizeHint() and paint()
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*/
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class PLASMA_EXPORT Widget : public QObject,
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public QGraphicsItem,
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public LayoutItem
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{
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Q_OBJECT
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Q_PROPERTY( Qt::Orientations expandingDirections READ expandingDirections )
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Q_PROPERTY( QSizeF minimumSize READ minimumSize WRITE setMinimumSize )
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Q_PROPERTY( QSizeF maximumSize READ maximumSize WRITE setMaximumSize )
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Q_PROPERTY( QRectF geometry READ geometry WRITE setGeometry )
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Q_PROPERTY( QSizeF sizeHint READ sizeHint )
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Q_PROPERTY( QSizeF size READ size WRITE resize )
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Q_PROPERTY( qreal opacity READ opacity WRITE setOpacity )
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public:
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enum CachePaintMode {
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NoCacheMode,
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ItemCoordinateCacheMode,
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DeviceCoordinateCacheMode
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};
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/**
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* Creates a new Plasma::Widget.
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* @param parent the QGraphicsItem this icon is parented to.
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*/
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explicit Widget(QGraphicsItem *parent = 0 , QObject *parentObject = 0);
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/**
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* Destroys a Plasma::Widget.
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*/
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virtual ~Widget();
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/**
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* This method is used by Plasma::Layout to determine which directions the
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* widget naturally expands.
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* @return bitmask with the directions that this Widget can be expanded.
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*/
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virtual Qt::Orientations expandingDirections() const;
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/**
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* Sets the minimum size of the Widget.
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* @param size the size to set as the minimum size.
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*/
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void setMinimumSize(const QSizeF& size);
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/**
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* @return minimum size of the Widget.
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*/
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QSizeF minimumSize() const;
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/**
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* Sets the maximum size of the Widget.
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* @param size the size to set as the maximum size.
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*/
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void setMaximumSize(const QSizeF& size);
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/**
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* @return maximum size of the Widget.
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*/
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QSizeF maximumSize() const;
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/**
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* This method is used by Plasma::Layout to determine whether this widget
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* can provide a height value given a width value.
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* @return whether or not this Widget has heightForWidth.
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*/
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virtual bool hasHeightForWidth() const;
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/**
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* This method is used by Plasma::Layout to determine a height value
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* given a width value.
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* @param width the width to use to determine height.
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* @return height calculated using width given.
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*/
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virtual qreal heightForWidth(qreal width) const;
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/**
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* This method is used by Plasma::Layout to determine whether this widget
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* can provide a width value given a height value.
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* @return whether or not this Widget has widthForHeight.
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*/
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virtual bool hasWidthForHeight() const;
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/**
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* This method is used by Plasma::Layout to determine a width value
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* given a height value.
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* @param height the width to use to determine width.
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* @return width calculated using height given.
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*/
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virtual qreal widthForHeight(qreal h) const;
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/**
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* @return geometry of this widget.
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*/
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QRectF geometry() const;
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/**
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* Sets the geometry of this Widget.
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*/
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/**
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* Sets the geometry of this Plasma::Widget
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* @param geometry the geometry to apply to this Plasma::Widget.
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*/
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void setGeometry(const QRectF &geometry);
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/**
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* This method is used to notify any containing Plasma::Layout that it should
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* reset its geometry.
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*/
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// NOTE: this is a completely broken concept -MB
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Q_INVOKABLE void updateGeometry();
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/**
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* Returns the recommended size for this widget. Note that this size is not
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* necessarily only the size for the widget, but might also include margins etc.
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* @return recommended size for this Plasma::Widget.
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*/
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virtual QSizeF sizeHint() const;
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/**
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* @return the size of this Plasma::Widget
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*/
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QSizeF size() const;
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/**
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* Reimplemented from QGraphicsItem
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* @return the bounding rectangle for this Plasma::Widget
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*/
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virtual QRectF boundingRect() const;
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/**
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* Resizes this Plasma::Widget.
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* @param size the new size of this Plasma::Widget.
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*/
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Q_INVOKABLE void resize(const QSizeF &size);
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/**
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* Convenience method for resizing this Plasma::Widget
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* @param width the new width.
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* @param height the new height.
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*/
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Q_INVOKABLE void resize(qreal width, qreal height);
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/**
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* @return this Plasma::Widget's parent, returns a null pointer if
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* none exist.
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*/
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Q_INVOKABLE Widget *parent() const;
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/**
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* Sets the parent of this Plasma::Widget;
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* @param widget the widget to reparent to.
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*/
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Q_INVOKABLE void reparent(Widget *widget);
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/**
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* Add another Plasma::Widget as a child of this one.
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* @param widget the widget to reparent to this Plasma::Widget.
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*/
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Q_INVOKABLE void addChild(Widget *widget);
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void setOpacity(qreal opacity);
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qreal opacity() const;
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/**
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* Sets the widget's cache paint mode and cache size.
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* @param mode the new cache paint mode
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* @param mode the new cache size, only applies to ItemCoordinateCacheMode
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*/
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void setCachePaintMode(CachePaintMode mode, const QSize &size = QSize());
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/**
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* The current cache paint mode.
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*/
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CachePaintMode cachePaintMode() const;
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/**
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* Invalidates the widget's cache paint mode for a given item rectangle.
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* @param rect the optional invalidated rectangle; if null, defaults to boundingRect().
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*/
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void update(const QRectF &rect = QRectF());
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inline void update(qreal _x, qreal _y, qreal w, qreal h)
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{ update(QRectF(_x, _y, w, h)); }
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virtual QGraphicsItem* graphicsItem();
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protected:
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/**
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* Paints the widget
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* @param painter the QPainter to use to paint.
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* @param option the style option used to give specific info on the item being dawn.
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* @param widget the parent QWidget (most likely the Corona)
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*/
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virtual void paintWidget(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
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private:
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void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
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class Private;
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Private *const d;
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};
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} // Plasma namespace
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#endif
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