kwin/virtualdesktops.h

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2012 Martin Gräßlin <mgraesslin@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, 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 General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#ifndef KWIN_VIRTUAL_DESKTOPS_H
#define KWIN_VIRTUAL_DESKTOPS_H
// KWin
#include <kwinglobals.h>
// Qt includes
#include <QObject>
#include <QPoint>
#include <QSize>
// KDE includes
#include <KDE/KConfig>
class KActionCollection;
class KLocalizedString;
class KShortcut;
class NETRootInfo;
namespace KWin {
/**
* @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);
/**
* @returns The coords of desktop @a id in grid units.
*/
QPoint gridCoords(uint id) const;
/**
* @returns The ID of the desktop at the point @a coords or 0 if no desktop exists at that
* point. @a coords is to be in grid units.
*/
uint at(QPoint coords) const;
int width() const;
int height() const;
const QSize &size() const;
private:
QSize m_size;
uint *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 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:
virtual ~VirtualDesktopManager();
/**
* @internal
**/
void setRootInfo(NETRootInfo *info);
/**
* @internal
**/
void setConfig(KSharedConfig::Ptr config);
/**
* @returns Total number of desktops currently in existence.
* @see setCount
* @see countChanged
*/
uint count() const;
/**
* @returns The ID of the current desktop.
* @see setCurrent
* @see currentChanged
*/
uint current() 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 The name of the @p desktop
**/
QString name(uint desktop) const;
/**
* @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;
/**
* @returns The ID of the desktop above desktop @a id. Wraps around to the bottom of
* the layout if @a wrap is set. If @a id is not set use the current one.
*/
uint above(uint id = 0, bool wrap = true) const;
/**
* @returns The ID of the desktop to the right of desktop @a id. Wraps around to the
* left of the layout if @a wrap is set. If @a id is not set use the current one.
*/
uint toRight(uint id = 0, bool wrap = true) const;
/**
* @returns The ID of the desktop below desktop @a id. Wraps around to the top of the
* layout if @a wrap is set. If @a id is not set use the current one.
*/
uint below(uint id = 0, bool wrap = true) const;
/**
* @returns The ID of the desktop to the left of desktop @a id. Wraps around to the
* right of the layout if @a wrap is set. If @a id is not set use the current one.
*/
uint toLeft(uint id = 0, bool wrap = true) const;
/**
* @returns The ID of the desktop after the desktop @a id. Wraps around to the first
* desktop if @a wrap is set. If @a id is not set use the current desktop.
**/
uint next(uint id = 0, bool wrap = true) const;
/**
* @returns The ID of the desktop in front of the desktop @a id. Wraps around to the
* last desktop if @a wrap is set. If @a id is not set use the current desktop.
**/
uint previous(uint id = 0, bool wrap = true) const;
void initShortcuts(KActionCollection *keys);
/**
* @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 @link numberOfDesktops or connect to the
* @link countChanged signal.
*
* In case the @link 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 @link desktopsRemoved
* is emitted.
* @param count The new number of desktops to use
* @see count
* @see maximum
* @see countChanged
* @see desktopsRemoved
*/
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);
/**
* Called from within setCount() to ensure the desktop layout is still valid.
*/
void updateLayout();
/**
* @param enable 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 emitted whenever the number of virtual desktops changes in a way
* that existing desktops are removed.
*
* The signal is emitted after the @c count property has been updated but prior
* to the @link countChanged signal being emitted.
* @param previousCount The number of desktops prior to the change.
* @see countChanged
* @see setCount
* @see count
**/
void desktopsRemoved(uint previousCount);
/**
* 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 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();
private:
/**
* This method is called when the number of desktops is updated in a way that desktops
* are removed. At the time when this method is invoked the count property is already
* updated but the corresponding signal has not been emitted yet.
*
* Ensures that in case the current desktop is on one of the removed
* desktops the last desktop after the change becomes the new desktop.
* Emits the signal @link desktopsRemoved.
*
* @param previousCount The number of desktops prior to the change.
* @see setCount
* @see desktopsRemoved
**/
void handleDesktopsRemoved(uint previousCount);
/**
* Generate a desktop layout from EWMH _NET_DESKTOP_LAYOUT property parameters.
*/
void setNETDesktopLayout(Qt::Orientation orientation, uint width, uint height, int startingCorner);
/**
* Updates the net root info for new number of desktops
**/
void updateRootInfo();
/**
* @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(KActionCollection *keys);
/**
* 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 keys The ActionCollection used to create the Action
* @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
**/
void addAction(KActionCollection *keys, const QString &name, const KLocalizedString &label, uint value, const KShortcut &key, const char *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 and
* no global shortcut is defined by default.
* @param keys The ActionCollection used to create the Action
* @param name The name of the action to be created
* @param label The localized name for the action to be created
* @param slot The slot to invoke when the action is triggered
**/
void addAction(KActionCollection *keys, const QString &name, const QString &label, const char *slot);
uint m_current;
uint m_count;
bool m_navigationWrapsAround;
VirtualDesktopGrid m_grid;
// TODO: QPointer
NETRootInfo *m_rootInfo;
KSharedConfig::Ptr m_config;
KWIN_SINGLETON_VARIABLE(VirtualDesktopManager, s_manager)
};
/**
* Function object to select the desktop above in the layout.
* Note: does not switch to the desktop!
**/
class DesktopAbove
{
public:
DesktopAbove() {}
/**
* @param desktop The desktop from which the desktop above should be selected. If @c 0 the current desktop is used
* @param wrap Whether to wrap around if already topmost desktop
* @returns Id of the desktop above @p desktop
**/
uint operator() (uint desktop, bool wrap) {
return VirtualDesktopManager::self()->above(desktop, wrap);
}
};
/**
* Function object to select the desktop below in the layout.
* Note: does not switch to the desktop!
**/
class DesktopBelow
{
public:
DesktopBelow() {}
/**
* @param desktop The desktop from which the desktop below should be selected. If @c 0 the current desktop is used
* @param wrap Whether to wrap around if already lowest desktop
* @returns Id of the desktop below @p desktop
**/
uint operator() (uint desktop, bool wrap) {
return VirtualDesktopManager::self()->below(desktop, wrap);
}
};
/**
* Function object to select the desktop to the left in the layout.
* Note: does not switch to the desktop!
**/
class DesktopLeft
{
public:
DesktopLeft() {}
/**
* @param desktop The desktop from which the desktop on the left should be selected. If @c 0 the current desktop is used
* @param wrap Whether to wrap around if already leftmost desktop
* @returns Id of the desktop left of @p desktop
**/
uint operator() (uint desktop, bool wrap) {
return VirtualDesktopManager::self()->toLeft(desktop, wrap);
}
};
/**
* Function object to select the desktop to the right in the layout.
* Note: does not switch to the desktop!
**/
class DesktopRight
{
public:
DesktopRight() {}
/**
* @param desktop The desktop from which the desktop on the right should be selected. If @c 0 the current desktop is used
* @param wrap Whether to wrap around if already rightmost desktop
* @returns Id of the desktop right of @p desktop
**/
uint operator() (uint desktop, bool wrap) {
return VirtualDesktopManager::self()->toRight(desktop, wrap);
}
};
/**
* Function object to select the next desktop in the layout.
* Note: does not switch to the desktop!
**/
class DesktopNext
{
public:
DesktopNext() {}
/**
* @param desktop The desktop from which the next desktop should be selected. If @c 0 the current desktop is used
* @param wrap Whether to wrap around if already last desktop
* @returns Id of the next desktop
**/
uint operator() (uint desktop, bool wrap) {
return VirtualDesktopManager::self()->next(desktop, wrap);
}
};
/**
* Function object to select the previous desktop in the layout.
* Note: does not switch to the desktop!
**/
class DesktopPrevious
{
public:
DesktopPrevious() {}
/**
* @param desktop The desktop from which the previous desktop should be selected. If @c 0 the current desktop is used
* @param wrap Whether to wrap around if already first desktop
* @returns Id of the previous desktop
**/
uint operator() (uint desktop, bool wrap) {
return VirtualDesktopManager::self()->previous(desktop, wrap);
}
};
/**
* Helper function to get the ID of a virtual desktop in the direction from
* the given @p desktop. If @c 0 the current desktop is used as a starting point.
* @param desktop The desktop from which the desktop in given Direction should be selected.
* @param wrap Whether desktop navigation wraps around at the borders of the layout
* @returns The next desktop in specified direction
**/
template <typename Direction>
uint getDesktop(int desktop = 0, bool wrap = true);
template <typename Direction>
uint getDesktop(int d, bool wrap)
{
Direction direction;
return direction(d, wrap);
}
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 VirtualDesktopGrid::at(QPoint coords) const
{
const int index = coords.y() * m_size.width() + coords.x();
if (index > m_size.width() * m_size.height() || coords.x() >= width() || coords.y() >= height()) {
return 0;
}
return m_grid[index];
}
inline
uint VirtualDesktopManager::maximum()
{
return 20;
}
inline
uint VirtualDesktopManager::current() const
{
return m_current;
}
inline
uint VirtualDesktopManager::count() const
{
return m_count;
}
inline
bool VirtualDesktopManager::isNavigationWrappingAround() const
{
return m_navigationWrapsAround;
}
inline
void VirtualDesktopManager::setRootInfo(NETRootInfo *info)
{
m_rootInfo = info;
}
inline
void VirtualDesktopManager::setConfig(KSharedConfig::Ptr config)
{
m_config = config;
}
inline
const VirtualDesktopGrid &VirtualDesktopManager::grid() const
{
return m_grid;
}
template <typename Direction>
void VirtualDesktopManager::moveTo(bool wrap)
{
Direction functor;
setCurrent(functor(0, wrap));
}
} // namespace KWin
#endif