JUCE: Desktop Class Reference

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Public Types | Public Member Functions | Static Public Member Functions | List of all members
Desktop Class Reference
juce_gui_basics » desktop

Describes and controls aspects of the computer's desktop. More...

`#include <juce_Desktop.h>`

Inheritance diagram for Desktop:

## Public Types
enum | DisplayOrientation { upright = 1 , upsideDown = 2 , rotatedClockwise = 4 , rotatedAntiClockwise = 8 , allOrientations = 1 + 2 + 4 + 8 }
| In a tablet/mobile device which can be turned around, this is used to indicate the orientation. More...

## Public Member Functions
int | getMouseButtonClickCounter () const noexcept
| Returns the number of times the mouse button has been clicked since the app started.
int | getMouseWheelMoveCounter () const noexcept
| Returns the number of times the mouse wheel has been moved since the app started.
void | addGlobalMouseListener (MouseListener *listener)
| Registers a MouseListener that will receive all mouse events that occur on any component.
void | removeGlobalMouseListener (MouseListener *listener)
| Unregisters a MouseListener that was added with addGlobalMouseListener().
void | addFocusChangeListener (FocusChangeListener *listener)
| Registers a FocusChangeListener that will receive a callback whenever the focused component changes.
void | removeFocusChangeListener (FocusChangeListener *listener)
| Unregisters a FocusChangeListener that was added with addFocusChangeListener().
void | addDarkModeSettingListener (DarkModeSettingListener *listener)
| Registers a DarkModeSettingListener that will receive a callback when the operating system dark mode setting changes.
void | removeDarkModeSettingListener (DarkModeSettingListener *listener)
| Unregisters a DarkModeSettingListener that was added with addDarkModeSettingListener().
bool | isDarkModeActive () const
| True if the operating system "dark mode" is active.
void | setKioskModeComponent (Component *componentToUse, bool allowMenusAndBars=true)
| Takes a component and makes it full-screen, removing the taskbar, dock, etc.
Component * | getKioskModeComponent () const noexcept
| Returns the component that is currently being used in kiosk-mode.
int | getNumComponents () const noexcept
| Returns the number of components that are currently active as top-level desktop windows.
Component * | getComponent (int index) const noexcept
| Returns one of the top-level desktop window components.
Component * | findComponentAt (Point< int > screenPosition) const
| Finds the component at a given screen location.
ComponentAnimator & | getAnimator () noexcept
| The Desktop object has a ComponentAnimator instance which can be used for performing your animations.
LookAndFeel & | getDefaultLookAndFeel () noexcept
| Returns the current default look-and-feel for components which don't have one explicitly set.
void | setDefaultLookAndFeel (LookAndFeel *newDefaultLookAndFeel)
| Changes the default look-and-feel.
const Array< MouseInputSource > & | getMouseSources () const noexcept
| Provides access to the array of mouse sources, for iteration.
int | getNumMouseSources () const noexcept
| Returns the number of MouseInputSource objects the system has at its disposal.
MouseInputSource * | getMouseSource (int index) const noexcept
| Returns one of the system's MouseInputSource objects.
MouseInputSource | getMainMouseSource () const noexcept
| Returns the main mouse input device that the system is using.
int | getNumDraggingMouseSources () const noexcept
| Returns the number of mouse-sources that are currently being dragged.
MouseInputSource * | getDraggingMouseSource (int index) const noexcept
| Returns one of the mouse sources that's currently being dragged.
void | beginDragAutoRepeat (int millisecondsBetweenCallbacks)
| Ensures that a non-stop stream of mouse-drag events will be sent during the current mouse-drag operation.
DisplayOrientation | getCurrentOrientation () const
| In a tablet device which can be turned around, this returns the current orientation.
void | setOrientationsEnabled (int allowedOrientations)
| Sets which orientations the display is allowed to auto-rotate to.
int | getOrientationsEnabled () const noexcept
| Returns the set of orientations the display is allowed to rotate to.
bool | isOrientationEnabled (DisplayOrientation orientation) const noexcept
| Returns whether the display is allowed to auto-rotate to the given orientation.
const Displays & | getDisplays () const noexcept
| Returns the Displays object representing the connected displays.
void | setGlobalScaleFactor (float newScaleFactor) noexcept
| Sets a global scale factor to be used for all desktop windows.
float | getGlobalScaleFactor () const noexcept
| Returns the current global scale factor, as set by setGlobalScaleFactor().
bool | isHeadless () const noexcept
| Returns true on a headless system where there are no connected displays.

## Static Public Member Functions
static Desktop &JUCE_CALLTYPE | getInstance ()
| There's only one desktop object, and this method will return it.
static Point< int > | getMousePosition ()
| Returns the mouse position.
static void | setMousePosition (Point< int > newPosition)
| Makes the mouse pointer jump to a given location.
static Point< int > | getLastMouseDownPosition ()
| Returns the last position at which a mouse button was pressed.
static void | setScreenSaverEnabled (bool isEnabled)
| This lets you prevent the screensaver from becoming active.
static bool | isScreenSaverEnabled ()
| Returns true if the screensaver has not been turned off.
static bool | canUseSemiTransparentWindows () noexcept
| True if the OS supports semitransparent windows.

## Detailed Description

Describes and controls aspects of the computer's desktop.

## Member Enumeration Documentation

## ◆ DisplayOrientation

enum Desktop::DisplayOrientation

In a tablet/mobile device which can be turned around, this is used to indicate the orientation.

Enumerator
upright | Indicates that the device is the normal way up.
upsideDown | Indicates that the device is upside-down.
rotatedClockwise | Indicates that the device is turned 90 degrees clockwise from its upright position.
rotatedAntiClockwise | Indicates that the device is turned 90 degrees anti-clockwise from its upright position.
allOrientations | A combination of all the orientation values.

## Member Function Documentation

## ◆ getInstance()

static Desktop &JUCE_CALLTYPE Desktop::getInstance | ( |  | ) |
| static

There's only one desktop object, and this method will return it.

Referenced by canUseSemiTransparentWindows(), AlertWindow::getDesktopScaleFactor(), DialogWindow::getDesktopScaleFactor(), and StandalonePluginHolder::getInstance().

## ◆ getMousePosition()

static Point< int > Desktop::getMousePosition | ( |  | ) |
| static

Returns the mouse position.

The coordinates are relative to the top-left of the main monitor.

Note that this is just a shortcut for calling getMainMouseSource().getScreenPosition(), and you should only resort to grabbing the global mouse position if there's really no way to get the coordinates via a mouse event callback instead.

## ◆ setMousePosition()

static void Desktop::setMousePosition | ( | Point< int > | newPosition | ) |
| static

Makes the mouse pointer jump to a given location.

The coordinates are relative to the top-left of the main monitor. Note that this is a pretty old method, kept around mainly for backwards-compatibility, and you should use the MouseInputSource class directly in new code.

## ◆ getLastMouseDownPosition()

static Point< int > Desktop::getLastMouseDownPosition | ( |  | ) |
| static

Returns the last position at which a mouse button was pressed.

Note that this is just a shortcut for calling getMainMouseSource().getLastMouseDownPosition(), and in a multi-touch environment, it doesn't make much sense. ALWAYS prefer to get this information via other means, such as MouseEvent::getMouseDownScreenPosition() if possible, and only ever call this as a last resort.

## ◆ getMouseButtonClickCounter()

int Desktop::getMouseButtonClickCounter | ( |  | ) | const
| noexcept

Returns the number of times the mouse button has been clicked since the app started.

Each mouse-down event increments this number by 1.

See also
  getMouseWheelMoveCounter

## ◆ getMouseWheelMoveCounter()

int Desktop::getMouseWheelMoveCounter | ( |  | ) | const
| noexcept

Returns the number of times the mouse wheel has been moved since the app started.

Each mouse-wheel event increments this number by 1.

See also
  getMouseButtonClickCounter

## ◆ setScreenSaverEnabled()

static void Desktop::setScreenSaverEnabled | ( | bool | isEnabled | ) |
| static

This lets you prevent the screensaver from becoming active.

Handy if you're running some sort of presentation app where having a screensaver appear would be annoying.

Pass false to disable the screensaver, and true to re-enable it. (Note that this won't enable a screensaver unless the user has actually set one up).

The disablement will only happen while the JUCE application is the foreground process - if another task is running in front of it, then the screensaver will be unaffected.

See also
  isScreenSaverEnabled

## ◆ isScreenSaverEnabled()

static bool Desktop::isScreenSaverEnabled | ( |  | ) |
| static

Returns true if the screensaver has not been turned off.

This will return the last value passed into setScreenSaverEnabled(). Note that it won't tell you whether the user is actually using a screen saver, just whether this app is deliberately preventing one from running.

See also
  setScreenSaverEnabled

## ◆ addGlobalMouseListener()

void Desktop::addGlobalMouseListener | ( | MouseListener * | listener | ) |

Registers a MouseListener that will receive all mouse events that occur on any component.

See also
  removeGlobalMouseListener

## ◆ removeGlobalMouseListener()

void Desktop::removeGlobalMouseListener | ( | MouseListener * | listener | ) |

Unregisters a MouseListener that was added with addGlobalMouseListener().

See also
  addGlobalMouseListener

## ◆ addFocusChangeListener()

void Desktop::addFocusChangeListener | ( | FocusChangeListener * | listener | ) |

Registers a FocusChangeListener that will receive a callback whenever the focused component changes.

See also
  removeFocusChangeListener

## ◆ removeFocusChangeListener()

void Desktop::removeFocusChangeListener | ( | FocusChangeListener * | listener | ) |

Unregisters a FocusChangeListener that was added with addFocusChangeListener().

See also
  addFocusChangeListener

## ◆ addDarkModeSettingListener()

void Desktop::addDarkModeSettingListener | ( | DarkModeSettingListener * | listener | ) |

Registers a DarkModeSettingListener that will receive a callback when the operating system dark mode setting changes.

To query whether dark mode is on use the isDarkModeActive() method.

See also
  isDarkModeActive, removeDarkModeSettingListener

## ◆ removeDarkModeSettingListener()

void Desktop::removeDarkModeSettingListener | ( | DarkModeSettingListener * | listener | ) |

Unregisters a DarkModeSettingListener that was added with addDarkModeSettingListener().

See also
  addDarkModeSettingListener

## ◆ isDarkModeActive()

bool Desktop::isDarkModeActive | ( |  | ) | const

True if the operating system "dark mode" is active.

To receive a callback when this setting changes implement the DarkModeSettingListener interface and use the addDarkModeSettingListener() to register a listener.

See also
  addDarkModeSettingListener, removeDarkModeSettingListener

Referenced by canUseSemiTransparentWindows().

## ◆ setKioskModeComponent()

void Desktop::setKioskModeComponent | ( | Component * | componentToUse,
|  | bool | allowMenusAndBars = true )

Takes a component and makes it full-screen, removing the taskbar, dock, etc.

The component must already be on the desktop for this method to work. It will be resized to completely fill the screen and any extraneous taskbars, menu bars, etc will be hidden.

To exit kiosk mode, just call setKioskModeComponent (nullptr). When this is called, the component that's currently being used will be resized back to the size and position it was in before being put into this mode.

If allowMenusAndBars is true, things like the menu and dock (on mac) are still allowed to pop up when the mouse moves onto them. If this is false, it'll try to hide as much on-screen paraphernalia as possible.

## ◆ getKioskModeComponent()

Component * Desktop::getKioskModeComponent | ( |  | ) | const
| noexcept

Returns the component that is currently being used in kiosk-mode.

This is the component that was last set by setKioskModeComponent(). If none has been set, this returns nullptr.

## ◆ getNumComponents()

int Desktop::getNumComponents | ( |  | ) | const
| noexcept

Returns the number of components that are currently active as top-level desktop windows.

See also
  getComponent, Component::addToDesktop

## ◆ getComponent()

Component * Desktop::getComponent | ( | int | index | ) | const
| noexcept

Returns one of the top-level desktop window components.

The index is from 0 to getNumComponents() - 1. This could return 0 if the index is out-of-range.

See also
  getNumComponents, Component::addToDesktop

## ◆ findComponentAt()

Component * Desktop::findComponentAt | ( | Point< int > | screenPosition | ) | const

Finds the component at a given screen location.

This will drill down into top-level windows to find the child component at the given position.

Returns nullptr if the coordinates are inside a non-JUCE window.

## ◆ getAnimator()

ComponentAnimator & Desktop::getAnimator | ( |  | ) |
| noexcept

The Desktop object has a ComponentAnimator instance which can be used for performing your animations.

Having a single shared ComponentAnimator object makes it more efficient when multiple components are being moved around simultaneously. It's also more convenient than having to manage your own instance of one.

See also
  ComponentAnimator

## ◆ getDefaultLookAndFeel()

LookAndFeel & Desktop::getDefaultLookAndFeel | ( |  | ) |
| noexcept

Returns the current default look-and-feel for components which don't have one explicitly set.

See also
  setDefaultLookAndFeel

## ◆ setDefaultLookAndFeel()

void Desktop::setDefaultLookAndFeel | ( | LookAndFeel * | newDefaultLookAndFeel | ) |

Changes the default look-and-feel.

Parameters

  newDefaultLookAndFeel | the new look-and-feel object to use - if this is set to nullptr, it will revert to using the system's default one. The object passed-in must be deleted by the caller when it's no longer needed.

See also
  getDefaultLookAndFeel

## ◆ getMouseSources()

const Array< MouseInputSource > & Desktop::getMouseSources | ( |  | ) | const
| noexcept

Provides access to the array of mouse sources, for iteration.

In a traditional single-mouse system, there might be only one MouseInputSource. On a multi-touch system, there could be one input source per potential finger. The number of mouse sources returned here may increase dynamically as the program runs. To find out how many mouse events are currently happening, use getNumDraggingMouseSources().

## ◆ getNumMouseSources()

int Desktop::getNumMouseSources | ( |  | ) | const
| noexcept

Returns the number of MouseInputSource objects the system has at its disposal.

In a traditional single-mouse system, there might be only one MouseInputSource. On a multi-touch system, there could be one input source per potential finger. The number of mouse sources returned here may increase dynamically as the program runs. To find out how many mouse events are currently happening, use getNumDraggingMouseSources().

See also
  getMouseSource

## ◆ getMouseSource()

MouseInputSource * Desktop::getMouseSource | ( | int | index | ) | const
| noexcept

Returns one of the system's MouseInputSource objects.

The index should be from 0 to getNumMouseSources() - 1. Out-of-range indexes will return a null pointer. In a traditional single-mouse system, there might be only one object. On a multi-touch system, there could be one input source per potential finger.

## ◆ getMainMouseSource()

MouseInputSource Desktop::getMainMouseSource | ( |  | ) | const
| noexcept

Returns the main mouse input device that the system is using.

See also
  getNumMouseSources()

## ◆ getNumDraggingMouseSources()

int Desktop::getNumDraggingMouseSources | ( |  | ) | const
| noexcept

Returns the number of mouse-sources that are currently being dragged.

In a traditional single-mouse system, this will be 0 or 1, depending on whether a JUCE component has the button down on it. In a multi-touch system, this could be any number from 0 to the number of simultaneous touches that can be detected.

## ◆ getDraggingMouseSource()

MouseInputSource * Desktop::getDraggingMouseSource | ( | int | index | ) | const
| noexcept

Returns one of the mouse sources that's currently being dragged.

The index should be between 0 and getNumDraggingMouseSources() - 1. If the index is out of range, or if no mice or fingers are down, this will return a null pointer.

## ◆ beginDragAutoRepeat()

void Desktop::beginDragAutoRepeat | ( | int | millisecondsBetweenCallbacks | ) |

Ensures that a non-stop stream of mouse-drag events will be sent during the current mouse-drag operation.

This allows you to make sure that mouseDrag() events are sent continuously, even when the mouse isn't moving. This can be useful for things like auto-scrolling components when the mouse is near an edge.

Call this method during a mouseDown() or mouseDrag() callback, specifying the minimum interval between consecutive mouse drag callbacks. The callbacks will continue until the mouse is released, and then the interval will be reset, so you need to make sure it's called every time you begin a drag event. Passing an interval of 0 or less will cancel the auto-repeat.

See also
  mouseDrag

## ◆ getCurrentOrientation()

DisplayOrientation Desktop::getCurrentOrientation | ( |  | ) | const

In a tablet device which can be turned around, this returns the current orientation.

## ◆ setOrientationsEnabled()

void Desktop::setOrientationsEnabled | ( | int | allowedOrientations | ) |

Sets which orientations the display is allowed to auto-rotate to.

For devices that support rotating desktops, this lets you specify which of the orientations your app can use.

The parameter is a bitwise or-ed combination of the values in DisplayOrientation, and must contain at least one set bit.

## ◆ getOrientationsEnabled()

int Desktop::getOrientationsEnabled | ( |  | ) | const
| noexcept

Returns the set of orientations the display is allowed to rotate to.

See also
  setOrientationsEnabled

## ◆ isOrientationEnabled()

bool Desktop::isOrientationEnabled | ( | DisplayOrientation | orientation | ) | const
| noexcept

Returns whether the display is allowed to auto-rotate to the given orientation.

Each orientation can be enabled using setOrientationEnabled(). By default, all orientations are allowed.

## ◆ getDisplays()

const Displays & Desktop::getDisplays | ( |  | ) | const
| noexcept

Returns the Displays object representing the connected displays.

See also
  Displays

## ◆ setGlobalScaleFactor()

void Desktop::setGlobalScaleFactor | ( | float | newScaleFactor | ) |
| noexcept

Sets a global scale factor to be used for all desktop windows.

Setting this will also scale the monitor sizes that are returned by getDisplays().

## ◆ getGlobalScaleFactor()

float Desktop::getGlobalScaleFactor | ( |  | ) | const
| noexcept

Returns the current global scale factor, as set by setGlobalScaleFactor().

See also
  setGlobalScaleFactor

Referenced by AlertWindow::getDesktopScaleFactor(), and DialogWindow::getDesktopScaleFactor().

## ◆ canUseSemiTransparentWindows()

static bool Desktop::canUseSemiTransparentWindows | ( |  | ) |
| staticnoexcept

True if the OS supports semitransparent windows.

References getInstance(), and isDarkModeActive().

## ◆ isHeadless()

bool Desktop::isHeadless | ( |  | ) | const
| noexcept

Returns true on a headless system where there are no connected displays.

The documentation for this class was generated from the following file:

- juce_Desktop.h