/*
 *   Copyright 2005 by Aaron Seigo <aseigo@kde.org>
 *
 *   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 PLASMA_DEFS_H
#define PLASMA_DEFS_H

/** @header plasma/plasma.h <Plasma/Plasma> */

#include <QtGui/QGraphicsItem>
#include <QtGui/QPainterPath>

#include <plasma/plasma_export.h>

#include <QAction>
#include <QMenu>
#include <QGraphicsView>

/**
 * Namespace for everything in libplasma
 */
namespace Plasma
{

/**
 * The Constraint enumeration lists the various constraints that Plasma
 * objects have managed for them and which they may wish to react to,
 * for instance in Applet::constraintsUpdated
 */
enum Constraint {
    NoConstraint = 0, /**< No constraint; never passed in to Applet::constraintsEvent on its own */
    FormFactorConstraint = 1, /**< The FormFactor for an object */
    LocationConstraint = 2, /**< The Location of an object */
    ScreenConstraint = 4, /**< Which screen an object is on */
    SizeConstraint = 8, /**< the size of the applet was changed */
    ImmutableConstraint = 16, /**< the immutability (locked) nature of the applet changed  */
    StartupCompletedConstraint = 32, /**< application startup has completed */
    ContextConstraint = 64, /**< the context (e.g. activity) has changed */
    PopupConstraint = 128, /**< the position of the popup needs to be recalculated*/
    AllConstraints = FormFactorConstraint | LocationConstraint | ScreenConstraint |
    SizeConstraint | ImmutableConstraint | ContextConstraint | PopupConstraint
};
Q_DECLARE_FLAGS(Constraints, Constraint)

/**
 * The FormFactor enumeration describes how a Plasma::Applet should arrange
 * itself. The value is derived from the container managing the Applet
 * (e.g. in Plasma, a Corona on the desktop or on a panel).
 **/
enum FormFactor {
    Planar = 0,  /**< The applet lives in a plane and has two
                    degrees of freedom to grow. Optimize for
                    desktop, laptop or tablet usage: a high
                    resolution screen 1-3 feet distant from the
                    viewer. */
    MediaCenter, /**< As with Planar, the applet lives in a plane
                    but the interface should be optimized for
                    medium-to-high resolution screens that are
                    5-15 feet distant from the viewer. Sometimes
                    referred to as a "ten foot interface".*/
    Horizontal,  /**< The applet is constrained vertically, but
                    can expand horizontally. */
    Vertical,     /**< The applet is constrained horizontally, but
                    can expand vertically. */
    Application /**< The Applet lives in a plane and should be optimized to look as a full application,
                     for the desktop or the particular device. */
};

/**
 * The Direction enumeration describes in which direction, relative to the
 * Applet (and its managing container), popup menus, expanders, balloons,
 * message boxes, arrows and other such visually associated widgets should
 * appear in. This is usually the oposite of the Location.
 **/
enum Direction {
    Down = 0, /**< Display downards */
    Up,       /**< Display upwards */
    Left,     /**< Display to the left */
    Right     /**< Display to the right */
};

/**
 * The Location enumeration describes where on screen an element, such as an
 * Applet or its managing container, is positioned on the screen.
 **/
enum Location {
    Floating = 0, /**< Free floating. Neither geometry or z-ordering
                     is described precisely by this value. */
    Desktop,      /**< On the planar desktop layer, extending across
                     the full screen from edge to edge */
    FullScreen,   /**< Full screen */
    TopEdge,      /**< Along the top of the screen*/
    BottomEdge,   /**< Along the bottom of the screen*/
    LeftEdge,     /**< Along the left side of the screen */
    RightEdge     /**< Along the right side of the screen */
};

/**
 * The popup position enumeration relatively to his attached widget
 *
 **/

enum PopupPlacement {
    FloatingPopup = 0,            /**< Free floating, non attached popup */
    TopPosedLeftAlignedPopup,     /**< Popup positioned on the top, aligned
                                     to the left of the wigdet */
    TopPosedRightAlignedPopup,    /**< Popup positioned on the top, aligned
                                     to the right of the widget */
    LeftPosedTopAlignedPopup,     /**< Popup positioned on the left, aligned
                                     to the right of the wigdet */
    LeftPosedBottomAlignedPopup,  /**< Popup positioned on the left, aligned
                                     to the bottom of the widget */
    BottomPosedLeftAlignedPopup,  /**< Popup positioned on the bottom, aligned
                                     to the left of the wigdet */
    BottomPosedRightAlignedPopup, /**< Popup positioned on the bottom, aligned
                                     to the right of the widget */
    RightPosedTopAlignedPopup,    /**< Popup positioned on the right, aligned
                                     to the top of the wigdet */
    RightPosedBottomAlignedPopup  /**< Popup positioned on the right, aligned
                                     to the bottom of the widget */
};

enum ItemTypes {
    AppletType = QGraphicsItem::UserType + 1
};

/**
 * Defines the immutability of items like applets, corona and containments
 * they can be free to modify, locked down by the user or locked down by the
 * system (e.g. kiosk setups).
 */
enum ImmutabilityType {
    Mutable = 1,        /**< The item can be modified in any way **/
    UserImmutable = 2,  /**< The user has requested a lock down, and can undo
                           the lock down at any time **/
    SystemImmutable = 4 /**<  the item is locked down by the system, the user
                           can't unlock it **/
};

/**
 * Defines the aspect ratio used when scaling an applet
 */
enum AspectRatioMode {
    InvalidAspectRatioMode = -1, /**< Unset mode used for dev convenience
                                    when there is a need to store the
                                    aspectRatioMode somewhere */
    IgnoreAspectRatio = 0,       /**< The applet can be freely resized */
    KeepAspectRatio = 1,         /**< The applet keeps a fixed aspect ratio */
    Square = 2,                  /**< The applet is always a square */
    ConstrainedSquare = 3,       /**< The applet is no wider (in horizontal
                                    formfactors) or no higher (in vertical
                                    ones) than a square */
    FixedSize = 4                /** The applet cannot be resized */
};

enum MarginEdge {
    TopMargin = 0, /**< The top margin **/
    BottomMargin, /**< The bottom margin **/
    LeftMargin, /**< The left margin **/
    RightMargin /**< The right margin **/
};

enum MessageButton {
    ButtonNone = 0, /**< None **/
    ButtonOk = 1, /**< OK Button **/
    ButtonYes = 2, /**< Yes Button **/
    ButtonNo = 4, /**< No Button **/
    ButtonCancel = 8 /**< Cancel Button **/
};
Q_DECLARE_FLAGS(MessageButtons, MessageButton)

/**
 * Status of an applet
 * @since 4.3
 */
enum ItemStatus {
    UnknownStatus = 0, /**< The status is unknown **/
    PassiveStatus = 1, /**< The Item is passive **/
    ActiveStatus = 2, /**< The Item is active **/
    NeedsAttentionStatus = 3 /**< The Item needs attention **/
};
Q_ENUMS(ItemStatus)

/**
 * Converts a location to a direction. Handy for figuring out which way to send a popup based on
 * location or to point arrows and other directional items.
 *
 * @param location the location of the container the element will appear in
 * @return the visual direction the element should be oriented in
 **/
PLASMA_EXPORT Direction locationToDirection(Location location);

/**
 * Converts a location to the direction facing it. Handy for figuring out which way to collapse
 * a popup or to point arrows at the item itself.
 *
 * @param location the location of the container the element will appear in
 * @return the visual direction the element should be oriented in
 **/
PLASMA_EXPORT Direction locationToInverseDirection(Location location);

/**
 * Returns the most appropriate QGraphicsView for the item.
 *
 * @param item the QGraphicsItem to locate a view for
 * @return pointer to a view, or 0 if none was found
 */
PLASMA_EXPORT QGraphicsView *viewFor(const QGraphicsItem *item);

/**
 * Returns a list of all actions in the given QMenu
 * This method flattens the hierarchy of the menu by prefixing the
 * text of all actions in a submenu with the submenu title.
 *
 * @param menu the QMenu storing the actions
 * @param prefix text to display before the text of all actions in the menu
 * @param parent QObject to be passed as parent of all the actions in the list
 *
 * @since 4.4
 */
PLASMA_EXPORT QList<QAction*> actionsFromMenu(QMenu *menu,
                                              const QString &prefix = QString(),
                                              QObject *parent = 0);

} // Plasma namespace

Q_DECLARE_OPERATORS_FOR_FLAGS(Plasma::Constraints)
Q_DECLARE_OPERATORS_FOR_FLAGS(Plasma::MessageButtons)


#endif // multiple inclusion guard