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