plasma-framework/widgets/widget.h

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/*
* Copyright 2007 by Alexander Wiedenbruch <mail@wiedenbruch.de>
* and Matias Valdenegro <mvaldenegro@informatica.utem.cl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef WIDGET_H_
#define WIDGET_H_
#include <QtGui/QGraphicsItem>
#include <QtCore/QRectF>
#include <QtCore/QSizeF>
#include <plasma/layouts/layoutitem.h>
#include <plasma/plasma_export.h>
namespace Plasma
{
class Layout;
/**
* Base class for all Widgets in Plasma.
*
* @author Alexander Wiedenbruch
* @author Matias Valdenegro
*
* Widgets are the basis for User Interfaces inside Plasma.
* Widgets are rectangular, but can be in any visible shape by just using transparency to mask
* out non-rectangular areas.
*
* To implement a Widget, just subclass Plasma::Widget and implement at minimum,
* sizeHint() and paintWidget()
*/
class PLASMA_EXPORT Widget : public QObject,
public QGraphicsItem,
public LayoutItem
{
Q_OBJECT
Q_PROPERTY( Qt::Orientations expandingDirections READ expandingDirections )
Q_PROPERTY( QSizeF minimumSize READ minimumSize WRITE setMinimumSize )
Q_PROPERTY( QSizeF maximumSize READ maximumSize WRITE setMaximumSize )
Q_PROPERTY( QRectF geometry READ geometry WRITE setGeometry )
Q_PROPERTY( QSizeF sizeHint READ sizeHint )
Q_PROPERTY( QSizeF size READ size WRITE resize )
Q_PROPERTY( qreal opacity READ opacity WRITE setOpacity )
public:
enum CachePaintMode {
NoCacheMode,
ItemCoordinateCacheMode,
DeviceCoordinateCacheMode
};
/**
* Creates a new Plasma::Widget.
* @param parent the QGraphicsItem this icon is parented to.
*/
explicit Widget(QGraphicsItem *parent = 0 , QObject *parentObject = 0);
/**
* Destroys a Plasma::Widget.
*/
virtual ~Widget();
/**
* This method is used by Plasma::Layout to determine which directions the
* widget naturally expands.
* @return bitmask with the directions that this Widget can be expanded.
*/
virtual Qt::Orientations expandingDirections() const;
/**
* Sets the minimum size of the Widget.
* @param size the size to set as the minimum size.
*/
void setMinimumSize(const QSizeF& size);
/**
* @return minimum size of the Widget.
*/
QSizeF minimumSize() const;
/**
* Sets the maximum size of the Widget.
* @param size the size to set as the maximum size.
*/
void setMaximumSize(const QSizeF& size);
/**
* @return maximum size of the Widget.
*/
QSizeF maximumSize() const;
/**
* This method is used by Plasma::Layout to determine whether this widget
* can provide a height value given a width value.
* @return whether or not this Widget has heightForWidth.
*/
virtual bool hasHeightForWidth() const;
/**
* This method is used by Plasma::Layout to determine a height value
* given a width value.
* @param width the width to use to determine height.
* @return height calculated using width given.
*/
virtual qreal heightForWidth(qreal width) const;
/**
* This method is used by Plasma::Layout to determine whether this widget
* can provide a width value given a height value.
* @return whether or not this Widget has widthForHeight.
*/
virtual bool hasWidthForHeight() const;
/**
* This method is used by Plasma::Layout to determine a width value
* given a height value.
* @param height the width to use to determine width.
* @return width calculated using height given.
*/
virtual qreal widthForHeight(qreal h) const;
/**
* @return geometry of this widget.
*/
QRectF geometry() const;
/**
* Sets the geometry of this Widget.
*/
/**
* Sets the geometry of this Plasma::Widget
* @param geometry the geometry to apply to this Plasma::Widget.
*/
virtual void setGeometry(const QRectF &geometry);
/**
* This method is used to notify any containing Plasma::Layout that it should
* reset its geometry.
*/
// NOTE: this is a completely broken concept -MB
Q_INVOKABLE void updateGeometry();
/**
* Returns the recommended size for this widget. Note that this size is not
* necessarily only the size for the widget, but might also include margins etc.
* @return recommended size for this Plasma::Widget.
*/
virtual QSizeF sizeHint() const;
/**
* @return the size of this Plasma::Widget
*/
QSizeF size() const;
/**
* @return the font currently set for this widget
**/
QFont font() const;
/**
* Set the font for this widget
*
* @param font the new font
**
TODO: implement once we decide how to handle the font system
void setFont(const QFont& font);
*/
/**
* Reimplemented from QGraphicsItem
* @return the bounding rectangle for this Plasma::Widget
*/
virtual QRectF boundingRect() const;
/**
* Resizes this Plasma::Widget.
* @param size the new size of this Plasma::Widget.
*/
Q_INVOKABLE void resize(const QSizeF &size);
/**
* Convenience method for resizing this Plasma::Widget
* @param width the new width.
* @param height the new height.
*/
Q_INVOKABLE void resize(qreal width, qreal height);
/**
* @return this Plasma::Widget's parent, returns a null pointer if
* none exist.
*/
Q_INVOKABLE Widget *parent() const;
/**
* Add another Plasma::Widget as a child of this one.
* @param widget the widget to reparent to this Plasma::Widget.
*/
Q_INVOKABLE void addChild(Widget *widget);
void setOpacity(qreal opacity);
qreal opacity() const;
/**
* Sets the widget's cache paint mode and cache size.
* @param mode the new cache paint mode
* @param mode the new cache size, only applies to ItemCoordinateCacheMode
*/
void setCachePaintMode(CachePaintMode mode, const QSize &size = QSize());
/**
* The current cache paint mode.
*/
CachePaintMode cachePaintMode() const;
/**
* Invalidates the widget's cache paint mode for a given item rectangle.
* @param rect the optional invalidated rectangle; if null, defaults to boundingRect().
*/
void update(const QRectF &rect = QRectF());
inline void update(qreal _x, qreal _y, qreal w, qreal h)
{ update(QRectF(_x, _y, w, h)); }
virtual QGraphicsItem* graphicsItem();
protected:
/**
* Paints the widget
* @param painter the QPainter to use to paint.
* @param option the style option used to give specific info on the item being dawn.
* @param widget the parent QWidget (most likely the Corona)
*/
virtual void paintWidget(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
QVariant itemChange(GraphicsItemChange change, const QVariant &value);
void setSize(qreal width, qreal height);
void setSize(const QSizeF& size);
void managingLayoutChanged();
private:
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = 0);
class Private;
Private *const d;
};
} // Plasma namespace
#endif