plasma-framework/extenders/extenderitem.h

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/*
* Copyright 2008, 2009 by Rob Scheepmaker <r.scheepmaker@student.utwente.nl>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifndef PLASMA_EXTENDERITEM_H
#define PLASMA_EXTENDERITEM_H
#include <QtGui/QGraphicsWidget>
#include <kconfiggroup.h>
#include <kicon.h>
#include "plasma/plasma_export.h"
namespace Plasma
{
class Applet;
class Extender;
class ExtenderGroup;
class ExtenderItemPrivate;
/**
* @class ExtenderItem plasma/extenderitem.h <Plasma/ExtenderItem>
*
* @short Provides detachable items for an Extender
*
* This class wraps around a QGraphicsWidget and provides drag&drop handling, a draghandle,
* title and ability to display qactions as a row of icon, ability to expand, collapse, return
* to source and tracks configuration associated with this item for you.
*
* Typical usage of ExtenderItems in your applet could look like this:
*
* @code
* if (!extender()->hasItem("networkmonitoreth0")) {
* ExtenderItem *item = new ExtenderItem(extender());
* //name can be used to later access this item through extender()->item(name):
* item->setName("networkmonitoreth0");
* item->config().writeEntry("device", "eth0");
* initExtenderItem(item);
* }
* @endcode
*
* Note that we first check if the item already exists: ExtenderItems are persistent
* between sessions so we can't blindly add items since they might already exist.
*
* You'll then need to implement the initExtenderItem function. Having this function in your applet
* makes sure that detached extender items get restored after plasma is restarted, just like applets
* are. That is also the reason that we write an entry in item->config().
* In this function you should instantiate a QGraphicsWidget or QGraphicsItem and call the
* setWidget function on the ExtenderItem. This is the only correct way of adding actual content to
* a extenderItem. An example:
*
* @code
* void MyApplet::initExtenderItem(Plasma::ExtenderItem *item)
* {
* QGraphicsWidget *myNetworkMonitorWidget = new NetworkMonitorWidget(item);
* dataEngine("networktraffic")->connectSource(item->config().readEntry("device", ""),
* myNetworkMonitorWidget);
* item->setWidget(myNetworkMonitorWidget);
* }
* @endcode
*
*/
class PLASMA_EXPORT ExtenderItem : public QGraphicsWidget
{
Q_OBJECT
Q_PROPERTY(QGraphicsItem * widget READ widget WRITE setWidget)
Q_PROPERTY(QString title READ title WRITE setTitle)
Q_PROPERTY(QString name READ name WRITE setName)
Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
Q_PROPERTY(Extender * extender READ extender WRITE setExtender)
Q_PROPERTY(bool collapsed READ isCollapsed WRITE setCollapsed)
Q_PROPERTY(bool detached READ isDetached)
Q_PROPERTY(uint autoExpireDelay READ autoExpireDelay WRITE setAutoExpireDelay)
public:
/**
* The constructor takes care of adding this item to an extender.
* @param hostExtender The extender the extender item belongs to.
* @param extenderItemId the id of the extender item. Use the default 0 to assign a new,
* unique id to this extender item.
*/
explicit ExtenderItem(Extender *hostExtender, uint extenderItemId = 0);
~ExtenderItem();
/**
* fetch the configuration of this widget.
* @return the configuration of this widget.
*/
KConfigGroup config() const;
/**
* @param widget The widget that should be wrapped into the extender item.
*/
void setWidget(QGraphicsItem *widget);
/**
* @return The widget that is wrapped into the extender item.
*/
QGraphicsItem *widget() const;
/**
* @param title the title that will be shown in the extender item's dragger. Default is
* no title. This title will also be stored in the item's configuration, so you don't have
* to manually store/restore this information for your extender items.
*/
void setTitle(const QString &title);
/**
* @return the title shown in the extender item's dragger.
*/
QString title() const;
/**
* You can assign names to extender items to look them up through the item() function.
* Make sure you only use unique names. This name will be stored in the item's
* configuration.
* @param name the name of the item. Defaults to an empty string.
*/
void setName(const QString &name);
/**
* @return the name of the item.
*/
QString name() const;
/**
* @param icon the icon name to display in the extender item's
* drag handle. Defaults to the source applet's icon. This icon name will also be stored
* in the item's configuration, so you don't have to manually store/restore this
* information.
*/
void setIcon(const QString &icon);
/**
* @param icon the icon to display in the extender item's drag handle. Defaults to the
* source applet's icon.
*/
void setIcon(const QIcon &icon);
/**
* @return the icon being displayed in the extender item's drag handle.
*/
QIcon icon() const;
/**
* @param extender the extender this item belongs to.
* @param pos the position in the extender this item should be added. Defaults to 'just
* append'.
*/
void setExtender(Extender *extender, const QPointF &pos = QPointF(-1, -1));
/**
* @return the extender this items belongs to.
*/
Extender *extender() const;
/**
* @param group the group you want this item to belong to. Note that you can't nest
* ExtenderGroups.
* @since 4.3
*/
void setGroup(ExtenderGroup *group);
/**
* @returns the group this item belongs to.
* @since 4.3
*/
ExtenderGroup *group() const;
/**
* @returns whether or not this is an ExtenderGroup.
* @since 4.3
*/
bool isGroup() const;
/**
* @param time (in ms) before this extender item destroys itself unless it is detached,
* in which case this extender stays around. 0 means forever and is the default.
*/
void setAutoExpireDelay(uint time);
/**
* @return whether or not this extender item has an auto expire delay.
*/
uint autoExpireDelay() const;
/**
* @return whether or not this item is detached from its original source.
*/
bool isDetached() const;
/**
* @return whether or not the extender item is collapsed.
*/
bool isCollapsed() const;
/**
* @param name the name to store the action under in our collection.
* @param action the action to add. Actions will be displayed as an icon in the drag
* handle.
*/
void addAction(const QString &name, QAction *action);
/**
* @return the QAction with the given name from our collection. By default the action
* collection contains a "movebacktosource" action which will be only shown when the
* item is detached.
*/
QAction *action(const QString &name) const;
public Q_SLOTS:
/**
* Destroys the extender item. As opposed to calling delete on this class, destroy also
* removes the config group associated with this item.
*/
void destroy();
/**
* Collapse or expand the extender item. Defaults to false.
*/
void setCollapsed(bool collapsed);
/**
* Returns the extender item to its source applet.
*/
void returnToSource();
/**
* Shows a close button in this item's drag handle. By default a close button will not be
* shown.
*/
void showCloseButton();
/**
* Hides the close button in this item's drag handle.
*/
void hideCloseButton();
Q_SIGNALS:
/**
* Emitted when the extender item is destroyed
* @since 4.4.1
*/
void destroyed(ExtenderItem *item);
protected:
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
void moveEvent(QGraphicsSceneMoveEvent *event);
void resizeEvent(QGraphicsSceneResizeEvent *event);
void mousePressEvent(QGraphicsSceneMouseEvent *event);
void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
void hoverMoveEvent(QGraphicsSceneHoverEvent *event);
void hoverLeaveEvent(QGraphicsSceneHoverEvent *event);
bool sceneEventFilter(QGraphicsItem *watched, QEvent *event);
QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint) const;
private:
Q_PRIVATE_SLOT(d, void toggleCollapse())
Q_PRIVATE_SLOT(d, void updateToolBox())
Q_PRIVATE_SLOT(d, void themeChanged())
Q_PRIVATE_SLOT(d, void sourceAppletRemoved())
Q_PRIVATE_SLOT(d, void actionDestroyed(QObject*))
ExtenderItemPrivate * const d;
friend class Applet;
friend class Extender;
friend class ExtenderPrivate;
friend class ExtenderItemPrivate;
};
} // namespace Plasma
#endif // PLASMA_EXTENDERITEM_H