/* * Copyright 2008, 2009 by Rob Scheepmaker * * 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 #include #include #include "plasma/plasma_export.h" namespace Plasma { class Applet; class Extender; class ExtenderGroup; class ExtenderItemPrivate; /** * @class ExtenderItem plasma/extenderitem.h * * @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 Extender; friend class ExtenderPrivate; friend class ExtenderItemPrivate; }; } // namespace Plasma #endif // PLASMA_EXTENDERITEM_H