File indexing completed on 2024-04-28 16:49:04

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2012 Martin Gräßlin <mgraesslin@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 #pragma once
 // KWin
 #include <kwin_export.h>
 #include <kwinglobals.h>
 // Qt includes
 #include <QAction>
 #include <QObject>
 #include <QPoint>
 #include <QPointer>
 #include <QSize>
 
 // KDE includes
 #include <KConfig>
 #include <KSharedConfig>
 
 class KLocalizedString;
 class NETRootInfo;
 class QAction;
 class Options;
 
 namespace KWaylandServer
 {
 class PlasmaVirtualDesktopManagementInterface;
 }
 
 namespace KWin
 {
 
 class KWIN_EXPORT VirtualDesktop : public QObject
 {
     Q_OBJECT
     Q_PROPERTY(QString id READ id CONSTANT)
     Q_PROPERTY(uint x11DesktopNumber READ x11DesktopNumber NOTIFY x11DesktopNumberChanged)
     Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
 public:
     explicit VirtualDesktop(QObject *parent = nullptr);
     ~VirtualDesktop() override;
 
     void setId(const QString &id);
     QString id() const
     {
         return m_id;
     }
 
     void setName(const QString &name);
     QString name() const
     {
         return m_name;
     }
 
     void setX11DesktopNumber(uint number);
     uint x11DesktopNumber() const
     {
         return m_x11DesktopNumber;
     }
 
 Q_SIGNALS:
     void nameChanged();
     void x11DesktopNumberChanged();
     /**
      * Emitted just before the desktop gets destroyed.
      */
     void aboutToBeDestroyed();
 
 private:
     QString m_id;
     QString m_name;
     int m_x11DesktopNumber = 0;
 };
 
 /**
  * @brief Two dimensional grid containing the ID of the virtual desktop at a specific position
  * in the grid.
  *
  * The VirtualDesktopGrid represents a visual layout of the Virtual Desktops as they are in e.g.
  * a Pager. This grid is used for getting a desktop next to a given desktop in any direction by
  * making use of the layout information. This allows navigation like move to desktop on left.
  */
 class VirtualDesktopGrid
 {
 public:
     VirtualDesktopGrid();
     ~VirtualDesktopGrid();
     void update(const QSize &size, Qt::Orientation orientation, const QVector<VirtualDesktop *> &desktops);
     /**
      * @returns The coords of desktop @a id in grid units.
      */
     QPoint gridCoords(uint id) const;
     /**
      * @returns The coords of desktop @a vd in grid units.
      */
     QPoint gridCoords(VirtualDesktop *vd) const;
     /**
      * @returns The desktop at the point @a coords or 0 if no desktop exists at that
      * point. @a coords is to be in grid units.
      */
     VirtualDesktop *at(const QPoint &coords) const;
     int width() const;
     int height() const;
     const QSize &size() const;
 
 private:
     QSize m_size;
     QVector<QVector<VirtualDesktop *>> m_grid;
 };
 
 /**
  * @brief Manages the number of available virtual desktops, the layout of those and which virtual
  * desktop is the current one.
  *
  * This manager is responsible for Virtual Desktop handling inside KWin. It has a property for the
  * count of available virtual desktops and a property for the currently active virtual desktop. All
  * changes to the number of virtual desktops and the current virtual desktop need to go through this
  * manager.
  *
  * On all changes a signal is emitted and interested parties should connect to the signal. The manager
  * itself does not interact with other parts of the system. E.g. it does not hide/show windows of
  * desktop changes. This is outside the scope of this manager.
  *
  * Internally the manager organizes the virtual desktops in a grid allowing to navigate over the
  * virtual desktops. For this a set of convenient methods are available which allow to get the id
  * of an adjacent desktop or to switch to an adjacent desktop. Interested parties should make use of
  * these methods and not replicate the logic to switch to the next desktop.
  */
 class KWIN_EXPORT VirtualDesktopManager : public QObject
 {
     Q_OBJECT
     /**
      * The number of virtual desktops currently available.
      * The ids of the virtual desktops are in the range [1, VirtualDesktopManager::maximum()].
      */
     Q_PROPERTY(uint count READ count WRITE setCount NOTIFY countChanged)
     /**
      * The id of the virtual desktop which is currently in use.
      */
     Q_PROPERTY(uint current READ current WRITE setCurrent NOTIFY currentChanged)
     /**
      * Whether navigation in the desktop layout wraps around at the borders.
      */
     Q_PROPERTY(bool navigationWrappingAround READ isNavigationWrappingAround WRITE setNavigationWrappingAround NOTIFY navigationWrappingAroundChanged)
 public:
     ~VirtualDesktopManager() override;
     /**
      * @internal, for X11 case
      */
     void setRootInfo(NETRootInfo *info);
     /**
      * @internal, for Wayland case
      */
     void setVirtualDesktopManagement(KWaylandServer::PlasmaVirtualDesktopManagementInterface *management);
     /**
      * @internal
      */
     void setConfig(KSharedConfig::Ptr config);
     /**
      * @returns Total number of desktops currently in existence.
      * @see setCount
      * @see countChanged
      */
     uint count() const;
     /**
      * @returns the number of rows the layout has.
      * @see setRows
      * @see rowsChanged
      */
     uint rows() const;
     /**
      * @returns The ID of the current desktop.
      * @see setCurrent
      * @see currentChanged
      */
     uint current() const;
     /**
      * @returns The current desktop
      * @see setCurrent
      * @see currentChanged
      */
     VirtualDesktop *currentDesktop() const;
     /**
      * Moves to the desktop through the algorithm described by Direction.
      * @param wrap If @c true wraps around to the other side of the layout
      * @see setCurrent
      */
     template<typename Direction>
     void moveTo(bool wrap = false);
 
     /**
      * @returns @c true if navigation at borders of layout wraps around, @c false otherwise
      * @see setNavigationWrappingAround
      * @see navigationWrappingAroundChanged
      */
     bool isNavigationWrappingAround() const;
 
     /**
      * @returns The layout aware virtual desktop grid used by this manager.
      */
     const VirtualDesktopGrid &grid() const;
 
     enum class Direction {
         Up,
         Down,
         Right,
         Left,
         Next,
         Previous
     };
     VirtualDesktop *inDirection(VirtualDesktop *desktop, Direction direction, bool wrap = true);
     uint inDirection(uint desktop, Direction direction, bool wrap = true);
     void moveTo(Direction direction, bool wrap = true);
 
     /**
      * @returns The desktop above desktop @a desktop. Wraps around to the bottom of
      * the layout if @a wrap is set. If @a desktop is @c null use the current one.
      */
     VirtualDesktop *above(VirtualDesktop *desktop, bool wrap = true) const;
     /**
      * @returns The desktop to the right of desktop @a desktop. Wraps around to the
      * left of the layout if @a wrap is set. If @a desktop is @c null use the current one.
      */
     VirtualDesktop *toRight(VirtualDesktop *desktop, bool wrap = true) const;
     /**
      * @returns The desktop below desktop @a desktop. Wraps around to the top of the
      * layout if @a wrap is set. If @a desktop is @c null use the current one.
      */
     VirtualDesktop *below(VirtualDesktop *desktop, bool wrap = true) const;
     /**
      * @returns The desktop to the left of desktop @a desktop. Wraps around to the
      * right of the layout if @a wrap is set. If @a desktop is @c null use the current one.
      */
     VirtualDesktop *toLeft(VirtualDesktop *desktop, bool wrap = true) const;
     /**
      * @returns The desktop after the desktop @a desktop. Wraps around to the first
      * desktop if @a wrap is set. If @a desktop is @c null use the current desktop.
      */
     VirtualDesktop *next(VirtualDesktop *desktop = nullptr, bool wrap = true) const;
     /**
      * @returns The desktop in front of the desktop @a desktop. Wraps around to the
      * last desktop if @a wrap is set. If @a desktop is @c null use the current desktop.
      */
     VirtualDesktop *previous(VirtualDesktop *desktop = nullptr, bool wrap = true) const;
 
     void initShortcuts();
 
     /**
      * @returns all currently managed VirtualDesktops
      */
     QVector<VirtualDesktop *> desktops() const
     {
         return m_desktops;
     }
 
     /**
      * @returns The VirtualDesktop for the x11 @p id, if no such VirtualDesktop @c null is returned
      */
     VirtualDesktop *desktopForX11Id(uint id) const;
 
     /**
      * @returns The VirtualDesktop for the internal desktop string @p id, if no such VirtualDesktop @c null is returned
      */
     VirtualDesktop *desktopForId(const QString &id) const;
 
     /**
      * Create a new virtual desktop at the requested position.
      * The difference with setCount is that setCount always adds new desktops at the end of the chain. The Id is automatically generated.
      * @param position The position of the desktop. It should be in range [0, count].
      * @param name The name for the new desktop, if empty the default name will be used.
      * @returns the new VirtualDesktop, nullptr if we reached the maximum number of desktops
      */
     VirtualDesktop *createVirtualDesktop(uint position, const QString &name = QString());
 
     /**
      * Remove the virtual desktop identified by id, if it exists
      * difference with setCount is that is possible to remove an arbitrary desktop,
      * not only the last one.
      * @param id the string id of the desktop to remove
      */
     void removeVirtualDesktop(const QString &id);
     void removeVirtualDesktop(VirtualDesktop *desktop);
 
     /**
      * Updates the net root info for new number of desktops
      */
     void updateRootInfo();
 
     /**
      * @returns The maximum number of desktops that KWin supports.
      */
     static uint maximum();
 
 public Q_SLOTS:
     /**
      * Set the number of available desktops to @a count. This function overrides any previous
      * grid layout.
      * There needs to be at least one virtual desktop and the new value is capped at the maximum
      * number of desktops. A caller of this function cannot expect that the change has been applied.
      * It is the callers responsibility to either check the numberOfDesktops or connect to the
      * countChanged signal.
      *
      * In case the @ref current desktop is on a desktop higher than the new count, the current desktop
      * is changed to be the new desktop with highest id. In that situation the signal desktopRemoved
      * is emitted.
      * @param count The new number of desktops to use
      * @see count
      * @see maximum
      * @see countChanged
      * @see desktopCreated
      * @see desktopRemoved
      */
     void setCount(uint count);
     /**
      * Set the current desktop to @a current.
      * @returns True on success, false otherwise.
      * @see current
      * @see currentChanged
      * @see moveTo
      */
     bool setCurrent(uint current);
     /**
      * Set the current desktop to @a current.
      * @returns True on success, false otherwise.
      * @see current
      * @see currentChanged
      * @see moveTo
      */
     bool setCurrent(VirtualDesktop *current);
     /**
      * Updates the layout to a new number of rows. The number of columns will be calculated accordingly
      */
     void setRows(uint rows);
     /**
      * Called from within setCount() to ensure the desktop layout is still valid.
      */
     void updateLayout();
     /**
      * @param enabled wrapping around borders for navigation in desktop layout
      * @see isNavigationWrappingAround
      * @see navigationWrappingAroundChanged
      */
     void setNavigationWrappingAround(bool enabled);
     /**
      * Loads number of desktops and names from configuration file
      */
     void load();
     /**
      * Saves number of desktops and names to configuration file
      */
     void save();
 
 Q_SIGNALS:
     /**
      * Signal emitted whenever the number of virtual desktops changes.
      * @param previousCount The number of desktops prior to the change
      * @param newCount The new current number of desktops
      */
     void countChanged(uint previousCount, uint newCount);
 
     /**
      * Signal when the number of rows in the layout changes
      * @param rows number of rows
      */
     void rowsChanged(uint rows);
 
     /**
      * A new desktop has been created
      * @param desktop the new just crated desktop
      */
     void desktopCreated(KWin::VirtualDesktop *desktop);
 
     /**
      * A desktop has been removed and is about to be deleted
      * @param desktop the desktop that has been removed.
      *          It's guaranteed to stil la valid pointer when the signal arrives,
      *          but it's about to be deleted.
      */
     void desktopRemoved(KWin::VirtualDesktop *desktop);
 
     /**
      * Signal emitted whenever the current desktop changes.
      * @param previousDesktop The virtual desktop changed from
      * @param newDesktop The virtual desktop changed to
      */
     void currentChanged(uint previousDesktop, uint newDesktop);
 
     /**
      * Signal emmitted for realtime desktop switching animations.
      * @param currentDesktop The current virtual desktop
      * @param offset The current total change in desktop coordinate
      * Offset x and y are negative if switching Left and Down.
      * Example: x = 0.6 means 60% of the way to the desktop to the right.
      */
     void currentChanging(uint currentDesktop, QPointF offset);
     void currentChangingCancelled();
 
     /**
      * Signal emitted whenever the desktop layout changes.
      * @param columns The new number of columns in the layout
      * @param rows The new number of rows in the layout
      */
     void layoutChanged(int columns, int rows);
     /**
      * Signal emitted whenever the navigationWrappingAround property changes.
      */
     void navigationWrappingAroundChanged();
 
 private Q_SLOTS:
     /**
      * Common slot for all "Switch to Desktop n" shortcuts.
      * This method uses the sender() method to access some data.
      * DO NOT CALL DIRECTLY! ONLY TO BE USED FROM AN ACTION!
      */
     void slotSwitchTo();
     /**
      * Slot for switch to next desktop action.
      */
     void slotNext();
     /**
      * Slot for switch to previous desktop action.
      */
     void slotPrevious();
     /**
      * Slot for switch to right desktop action.
      */
     void slotRight();
     /**
      * Slot for switch to left desktop action.
      */
     void slotLeft();
     /**
      * Slot for switch to desktop above action.
      */
     void slotUp();
     /**
      * Slot for switch to desktop below action.
      */
     void slotDown();
 
     /* For gestured desktopSwitching
      * Called when gesture ended, the thing that actually switches the desktop.
      */
     void gestureReleasedY();
     void gestureReleasedX();
 
 private:
     /**
      * Generate a desktop layout from EWMH _NET_DESKTOP_LAYOUT property parameters.
      */
     void setNETDesktopLayout(Qt::Orientation orientation, uint width, uint height, int startingCorner);
     /**
      * @returns A default name for the given @p desktop
      */
     QString defaultName(int desktop) const;
     /**
      * Creates all the global keyboard shortcuts for "Switch To Desktop n" actions.
      */
     void initSwitchToShortcuts();
     /**
      * Creates an action and connects it to the @p slot in this Manager. This method is
      * meant to be used for the case that an additional information needs to be stored in
      * the action and the label.
      * @param name The name of the action to be created
      * @param label The localized name for the action to be created
      * @param value An additional value added to the label and to the created action
      * @param key The global shortcut for the action
      * @param slot The slot to invoke when the action is triggered
      */
     QAction *addAction(const QString &name, const KLocalizedString &label, uint value, const QKeySequence &key, void (VirtualDesktopManager::*slot)());
     /**
      * Creates an action and connects it to the @p slot in this Manager.
      * Overloaded method for the case that no additional value needs to be passed to the action.
      * @param name The name of the action to be created
      * @param label The localized name for the action to be created
      * @param key The global shortcut for the action. If an empty QKeySequence is passed, no global shortcut is defined by default.
      * @param slot The slot to invoke when the action is triggered
      */
     QAction *addAction(const QString &name, const QString &label, const QKeySequence &key, void (VirtualDesktopManager::*slot)());
 
     QVector<VirtualDesktop *> m_desktops;
     QPointer<VirtualDesktop> m_current;
     quint32 m_rows = 2;
     bool m_navigationWrapsAround;
     VirtualDesktopGrid m_grid;
     // TODO: QPointer
     NETRootInfo *m_rootInfo;
     KWaylandServer::PlasmaVirtualDesktopManagementInterface *m_virtualDesktopManagement = nullptr;
     KSharedConfig::Ptr m_config;
 
     std::unique_ptr<QAction> m_swipeGestureReleasedY;
     std::unique_ptr<QAction> m_swipeGestureReleasedX;
     QPointF m_currentDesktopOffset = QPointF(0, 0);
 
     KWIN_SINGLETON_VARIABLE(VirtualDesktopManager, s_manager)
 };
 
 inline int VirtualDesktopGrid::width() const
 {
     return m_size.width();
 }
 
 inline int VirtualDesktopGrid::height() const
 {
     return m_size.height();
 }
 
 inline const QSize &VirtualDesktopGrid::size() const
 {
     return m_size;
 }
 
 inline uint VirtualDesktopManager::maximum()
 {
     return 20;
 }
 
 inline uint VirtualDesktopManager::count() const
 {
     return m_desktops.count();
 }
 
 inline bool VirtualDesktopManager::isNavigationWrappingAround() const
 {
     return m_navigationWrapsAround;
 }
 
 inline void VirtualDesktopManager::setConfig(KSharedConfig::Ptr config)
 {
     m_config = std::move(config);
 }
 
 inline const VirtualDesktopGrid &VirtualDesktopManager::grid() const
 {
     return m_grid;
 }
 
 } // namespace KWin