org.eclipse.swt.widgets.Display

All Implemented Interfaces:: Executor, Drawable

public class Display extends Device implements Executor

Instances of this class are responsible for managing the connection between SWT and the underlying operating system. Their most important function is to implement the SWT event loop in terms of the platform event model. They also provide various methods for accessing information about the operating system, and have overall control over the operating system resources which SWT allocates.

Applications which are built with SWT will almost always require only a single display. In particular, some platforms which SWT supports will not allow more than one active display. In other words, some platforms do not support creating a new display if one already exists that has not been sent the dispose() message.

In SWT, the thread which creates a Display instance is distinguished as the user-interface thread for that display.

The user-interface thread for a particular display has the following special attributes:

The event loop for that display must be run from the thread.
Some SWT API methods (notably, most of the public methods in Widget and its subclasses), may only be called from the thread. (To support multi-threaded user-interface applications, class Display provides inter-thread communication methods which allow threads other than the user-interface thread to request that it perform operations on their behalf.)
The thread is not allowed to construct other Displays until that display has been disposed. (Note that, this is in addition to the restriction mentioned above concerning platform support for multiple displays. Thus, the only way to have multiple simultaneously active displays, even on platforms which support it, is to have multiple threads.)

Enforcing these attributes allows SWT to be implemented directly on the underlying operating system's event model. This has numerous benefits including smaller footprint, better use of resources, safer memory management, clearer program logic, better performance, and fewer overall operating system threads required. The down side however, is that care must be taken (only) when constructing multi-threaded applications to use the inter-thread communication mechanisms which this class provides when required.

All SWT API methods which may only be called from the user-interface thread are distinguished in their documentation by indicating that they throw the "ERROR_THREAD_INVALID_ACCESS" SWT exception.

Styles:: (none)
Events:: Close, Dispose, OpenDocument, Settings, Skin

IMPORTANT: This class is not intended to be subclassed.

See Also:

Restriction:

This class is not intended to be subclassed by clients.

Field Summary

Fields

Modifier and Type

Field

Description

org.eclipse.swt.internal.win32.MSG

msg

the handle to the OS message queue (Warning: This field is platform dependent)

Fields inherited from class org.eclipse.swt.graphics.Device
CurrentDevice, DEBUG, DeviceFinder
Constructor Summary

Constructors

Constructor

Description

Display()

Constructs a new instance of this class.

Display(DeviceData data)

Constructs a new instance of this class using the parameter.
Method Summary

Modifier and Type

Method

Description

void

addFilter(int eventType, Listener listener)

Adds the listener to the collection of listeners who will be notified when an event of the given type occurs anywhere in a widget.

void

addListener(int eventType, Listener listener)

Adds the listener to the collection of listeners who will be notified when an event of the given type occurs.

void

asyncExec(Runnable runnable)

Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity.

void

beep()

Causes the system hardware to emit a short sound (if it supports this capability).

protected void

checkDevice()

Throws an SWTException if the receiver can not be accessed by the caller.

protected void

checkSubclass()

Checks that this class can be subclassed.

void

close()

Requests that the connection between SWT and the underlying operating system be closed.

protected void

create(DeviceData data)

Creates the device in the operating system.

protected void

destroy()

Destroys the device in the operating system and releases the device's handle.

void

disposeExec(Runnable runnable)

Causes the run() method of the runnable to be invoked by the user-interface thread just before the receiver is disposed.

void

execute(Runnable runnable)

Executes the given runnable in the user-interface thread of this Display.

static Display

findDisplay(Thread thread)

Returns the display which the given thread is the user-interface thread for, or null if the given thread is not a user-interface thread for any display.

Widget

findWidget(long handle)

Given the operating system handle for a widget, returns the instance of the Widget subclass which represents it in the currently running application, if such exists, or null if no matching widget can be found.

Widget

findWidget(long handle, long id)

Given the operating system handle for a widget, and widget-specific id, returns the instance of the Widget subclass which represents the handle/id pair in the currently running application, if such exists, or null if no matching widget can be found.

Widget

findWidget(Widget widget, long id)

Given a widget and a widget-specific id, returns the instance of the Widget subclass which represents the widget/id pair in the currently running application, if such exists, or null if no matching widget can be found.

Shell

getActiveShell()

Returns the currently active Shell, or null if no shell belonging to the currently running application is active.

static String

getAppName()

Returns the application name.

static String

getAppVersion()

Returns the application version.

Rectangle

getBounds()

Returns a rectangle describing the receiver's size and location.

Rectangle

getClientArea()

Returns a rectangle which describes the area of the receiver which is capable of displaying data.

static Display

getCurrent()

Returns the display which the currently running thread is the user-interface thread for, or null if the currently running thread is not a user-interface thread for any display.

Control

getCursorControl()

Returns the control which the on-screen pointer is currently over top of, or null if it is not currently over one of the controls built by the currently running application.

Point

getCursorLocation()

Returns the location of the on-screen pointer relative to the top left corner of the screen.

Point[]

getCursorSizes()

Returns an array containing the recommended cursor sizes.

Object

getData()

Returns the application defined, display specific data associated with the receiver, or null if it has not been set.

Object

getData(String key)

Returns the application defined property of the receiver with the specified name, or null if it has not been set.

static Display

getDefault()

Returns the default display.

protected int

getDeviceZoom()

Gets the scaling factor from the device and calculates the zoom level.

int

getDismissalAlignment()

Returns the button dismissal alignment, one of LEFT or RIGHT.

int

getDoubleClickTime()

Returns the longest duration, in milliseconds, between two mouse button clicks that will be considered a double click by the underlying operating system.

final Consumer<Error>

getErrorHandler()

Returns the current exception handler.

Control

getFocusControl()

Returns the control which currently has keyboard focus, or null if keyboard events are not currently going to any of the controls built by the currently running application.

boolean

getHighContrast()

Returns true when the high contrast mode is enabled.

int

getIconDepth()

Returns the maximum allowed depth of icons on this display, in bits per pixel.

Point[]

getIconSizes()

Returns an array containing the recommended icon sizes.

Menu

getMenuBar()

Returns the single instance of the application menu bar, or null if there is no application menu bar for the platform.

Monitor[]

getMonitors()

Returns an array of monitors attached to the device.

Monitor

getPrimaryMonitor()

Returns the primary monitor for that device.

final Consumer<RuntimeException>

getRuntimeExceptionHandler()

Returns the current exception handler.

Shell[]

getShells()

Returns a (possibly empty) array containing all shells which have not been disposed and have the receiver as their display.

Synchronizer

getSynchronizer()

Gets the synchronizer used by the display.

Thread

getSyncThread()

Returns the thread that has invoked syncExec or null if no such runnable is currently being invoked by the user-interface thread.

Color

getSystemColor(int id)

Returns the matching standard color for the given constant, which should be one of the color constants specified in class SWT.

Cursor

getSystemCursor(int id)

Returns the matching standard platform cursor for the given constant, which should be one of the cursor constants specified in class SWT.

Font

getSystemFont()

Returns a reasonable font for applications to use.

Image

getSystemImage(int id)

Returns the matching standard platform image for the given constant, which should be one of the icon constants specified in class SWT.

Menu

getSystemMenu()

Returns the single instance of the system-provided menu for the application, or null on platforms where no menu is provided for the application.

TaskBar

getSystemTaskBar()

Returns the single instance of the system taskBar or null when there is no system taskBar available for the platform.

Tray

getSystemTray()

Returns the single instance of the system tray or null when there is no system tray available for the platform.

Thread

getThread()

Returns the user-interface thread for the receiver.

boolean

getTouchEnabled()

Returns a boolean indicating whether a touch-aware input device is attached to the system and is ready for use.

protected void

init()

Initializes any internal resources needed by the device.

void

internal_dispose_GC(long hDC, GCData data)

Invokes platform specific functionality to dispose a GC handle.

long

internal_new_GC(GCData data)

Invokes platform specific functionality to allocate a new GC handle.

boolean

isRescalingAtRuntime()

Returns whether rescaling of shells at runtime when the DPI scaling of a shell's monitor changes is activated for this device.

static boolean

isSystemDarkTheme()

Returns true if the current OS theme has a dark appearance, else returns false.

Point

map(Control from, Control to, int x, int y)

Maps a point from one coordinate system to another.

Rectangle

map(Control from, Control to, int x, int y, int width, int height)

Maps a point from one coordinate system to another.

Point

map(Control from, Control to, Point point)

Maps a point from one coordinate system to another.

Rectangle

map(Control from, Control to, Rectangle rectangle)

Maps a point from one coordinate system to another.

boolean

post(Event event)

Generate a low level system event.

boolean

readAndDispatch()

Reads an event from the operating system's event queue, dispatches it appropriately, and returns true if there is potentially more work to do, or false if the caller can sleep until another event is placed on the event queue.

protected void

release()

Releases any internal resources back to the operating system and clears all fields except the device handle.

void

removeFilter(int eventType, Listener listener)

Removes the listener from the collection of listeners who will be notified when an event of the given type occurs anywhere in a widget.

void

removeListener(int eventType, Listener listener)

Removes the listener from the collection of listeners who will be notified when an event of the given type occurs.

void

sendPostExternalEventDispatchEvent()

Sends a SWT.PostExternalEventDispatch event.

void

sendPreExternalEventDispatchEvent()

Sends a SWT.PreExternalEventDispatch event.

static void

setAppName(String name)

Sets the application name to the argument.

static void

setAppVersion(String version)

Sets the application version to the argument.

void

setCursorLocation(int x, int y)

Sets the location of the on-screen pointer relative to the top left corner of the screen.

void

setCursorLocation(Point point)

Sets the location of the on-screen pointer relative to the top left corner of the screen.

void

setData(Object data)

Sets the application defined, display specific data associated with the receiver, to the argument.

void

setData(String key, Object value)

Sets the application defined property of the receiver with the specified name to the given argument.

final void

setErrorHandler(Consumer<Error> errorHandler)

Sets a callback that will be invoked whenever an error is thrown by a listener or external callback function.

boolean

setRescalingAtRuntime(boolean activate)

Activates or deactivates rescaling of shells at runtime whenever the DPI scaling of the shell's monitor changes.

final void

setRuntimeExceptionHandler(Consumer<RuntimeException> runtimeExceptionHandler)

Sets a callback that will be invoked whenever an exception is thrown by a listener or external callback function.

void

setSynchronizer(Synchronizer synchronizer)

Sets the synchronizer used by the display to be the argument, which can not be null.

boolean

sleep()

Causes the user-interface thread to sleep (that is, to be put in a state where it does not consume CPU cycles) until an event is received or it is otherwise awakened.

<T, E extends Exception> T

syncCall(SwtCallable<T,E> callable)

Calls the callable on the user-interface thread at the next reasonable opportunity, and returns the its result from this method.

void

syncExec(Runnable runnable)

Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity.

void

timerExec(int milliseconds, Runnable runnable)

Causes the run() method of the runnable to be invoked by the user-interface thread after the specified number of milliseconds have elapsed.

void

update()

Forces all outstanding paint requests for the display to be processed before this method returns.

void

wake()

If the receiver's user-interface thread was sleeping, causes it to be awakened and start running again.

Methods inherited from class org.eclipse.swt.graphics.Device
dispose, getDepth, getDeviceData, getDPI, getFontList, getWarnings, isDisposed, isTracking, loadFont, setTracking, setWarnings, win32_destroyUnusedHandles

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.eclipse.swt.graphics.Drawable
isAutoScalable

Field Details
- msg
  
  public org.eclipse.swt.internal.win32.MSG msg
  
  the handle to the OS message queue (Warning: This field is platform dependent)
  IMPORTANT: This field is not part of the SWT public API. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms and should never be accessed from application code.
  
  Restriction:
  
  This field is not intended to be referenced by clients.
Constructor Details
- Display
  
  public Display()
  
  Constructs a new instance of this class.
  Note: The resulting display is marked as the current display. If this is the first display which has been constructed since the application started, it is also marked as the default display.
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if called from a thread that already created an existing display
  
  ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
  
  See Also:
  
  getCurrent()
  
  getDefault()
  
  Widget.checkSubclass()
  
  Shell
- Display
  
  public Display(DeviceData data)
  
  Constructs a new instance of this class using the parameter.
  
  Parameters:
  
  data - the device data
Method Details
- addFilter
  
  public void addFilter(int eventType, Listener listener)
  
  Adds the listener to the collection of listeners who will be notified when an event of the given type occurs anywhere in a widget. The event type is one of the event constants defined in class SWT. When the event does occur, the listener is notified by sending it the handleEvent() message.
  Setting the type of an event to SWT.None from within the handleEvent() method can be used to change the event type and stop subsequent Java listeners from running. Because event filters run before other listeners, event filters can both block other listeners and set arbitrary fields within an event. For this reason, event filters are both powerful and dangerous. They should generally be avoided for performance, debugging and code maintenance reasons.
  Parameters:
  
  eventType - the type of event to listen for
  
  listener - the listener which should be notified when the event occurs
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the listener is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
  
  See Also:
  
  Listener
  
  SWT
  
  removeFilter(int, org.eclipse.swt.widgets.Listener)
  
  removeListener(int, org.eclipse.swt.widgets.Listener)
- addListener
  
  public void addListener(int eventType, Listener listener)
  
  Adds the listener to the collection of listeners who will be notified when an event of the given type occurs. The event type is one of the event constants defined in class SWT. When the event does occur in the display, the listener is notified by sending it the handleEvent() message.
  Parameters:
  
  eventType - the type of event to listen for
  
  listener - the listener which should be notified when the event occurs
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the listener is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.0
  
  See Also:
  
  Listener
  
  SWT
  
  removeListener(int, org.eclipse.swt.widgets.Listener)
- asyncExec
  
  public void asyncExec(Runnable runnable)
  
  Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity. The caller of this method continues to run in parallel, and is not notified when the runnable has completed. Specifying null as the runnable simply wakes the user-interface thread when run.
  Note that at the time the runnable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is necessary to check for this case inside the runnable before accessing the widget.
  Parameters:
  
  runnable - code to run on the user-interface thread or null
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  syncExec(java.lang.Runnable)
- execute
  
  public void execute(Runnable runnable)
  Executes the given runnable in the user-interface thread of this Display.
  
  If the calling thread is the user-interface thread of this display it is executed immediately and the method returns after the command has run, as with the method syncExec(Runnable).
  
  In all other cases the run() method of the runnable is asynchronously executed as with the method asyncExec(Runnable) at the next reasonable opportunity. The caller of this method continues to run in parallel, and is not notified when the runnable has completed.
  
  This can be used in cases where one want to execute some piece of code that should be guaranteed to run in the user-interface thread regardless of the current thread.
  
  Note that at the time the runnable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is advised to check for this case inside the runnable before accessing the widget.
  Specified by:
  
  execute in interface Executor
  
  Parameters:
  
  runnable - the runnable to execute in the user-interface thread, never null
  
  Throws:
  
  RejectedExecutionException - if this task cannot be accepted for execution
  
  NullPointerException - if runnable is null
- beep
  
  public void beep()
  
  Causes the system hardware to emit a short sound (if it supports this capability).
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- checkSubclass
  
  protected void checkSubclass()
  
  Checks that this class can be subclassed.
  IMPORTANT: See the comment in Widget.checkSubclass().
  Throws:
  
  SWTException -
  
  ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
  
  See Also:
  
  Widget.checkSubclass()
- checkDevice
  
  protected void checkDevice()
  
  Description copied from class: Device
  
  Throws an SWTException if the receiver can not be accessed by the caller. This may include both checks on the state of the receiver and more generally on the entire execution context. This method should be called by device implementors to enforce the standard SWT invariants.
  Currently, it is an error to invoke any method (other than isDisposed() and dispose()) on a device that has had its dispose() method called.
  In future releases of SWT, there may be more or fewer error checks and exceptions may be thrown for different reasons.
  
  Overrides:
  
  checkDevice in class Device
- close
  
  public void close()
  
  Requests that the connection between SWT and the underlying operating system be closed.
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.0
  
  See Also:
  
  Device.dispose()
- create
  
  protected void create(DeviceData data)
  
  Creates the device in the operating system. If the device does not have a handle, this method may do nothing depending on the device.
  This method is called before init.
  Overrides:
  
  create in class Device
  
  Parameters:
  
  data - the DeviceData which describes the receiver
  
  See Also:
  
  init()
- destroy
  
  protected void destroy()
  
  Destroys the device in the operating system and releases the device's handle. If the device does not have a handle, this method may do nothing depending on the device.
  This method is called after release.
  Overrides:
  
  destroy in class Device
  
  See Also:
  
  Device.dispose()
  
  release()
- disposeExec
  
  public void disposeExec(Runnable runnable)
  
  Causes the run() method of the runnable to be invoked by the user-interface thread just before the receiver is disposed. Specifying a null runnable is ignored.
  Parameters:
  
  runnable - code to run at dispose time.
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- findWidget
  
  public Widget findWidget(long handle)
  
  Given the operating system handle for a widget, returns the instance of the Widget subclass which represents it in the currently running application, if such exists, or null if no matching widget can be found.
  IMPORTANT: This method should not be called from application code. The arguments are platform-specific.
  Parameters:
  
  handle - the handle for the widget
  
  Returns:
  
  the SWT widget that the handle represents
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- findWidget
  
  public Widget findWidget(long handle, long id)
  
  Given the operating system handle for a widget, and widget-specific id, returns the instance of the Widget subclass which represents the handle/id pair in the currently running application, if such exists, or null if no matching widget can be found.
  IMPORTANT: This method should not be called from application code. The arguments are platform-specific.
  Parameters:
  
  handle - the handle for the widget
  
  id - the id for the subwidget (usually an item)
  
  Returns:
  
  the SWT widget that the handle/id pair represents
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.1
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- findWidget
  
  public Widget findWidget(Widget widget, long id)
  
  Given a widget and a widget-specific id, returns the instance of the Widget subclass which represents the widget/id pair in the currently running application, if such exists, or null if no matching widget can be found.
  Parameters:
  
  widget - the widget
  
  id - the id for the subwidget (usually an item)
  
  Returns:
  
  the SWT subwidget (usually an item) that the widget/id pair represents
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.3
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- findDisplay
  
  public static Display findDisplay(Thread thread)
  
  Returns the display which the given thread is the user-interface thread for, or null if the given thread is not a user-interface thread for any display. Specifying null as the thread will return null for the display.
  
  Parameters:
  
  thread - the user-interface thread
  
  Returns:
  
  the display for the given thread
- getActiveShell
  
  public Shell getActiveShell()
  
  Returns the currently active Shell, or null if no shell belonging to the currently running application is active.
  Returns:
  
  the active shell or null
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getMenuBar
  
  public Menu getMenuBar()
  
  Returns the single instance of the application menu bar, or null if there is no application menu bar for the platform.
  Returns:
  
  the application menu bar, or null
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.7
- getBounds
  
  public Rectangle getBounds()
  
  Returns a rectangle describing the receiver's size and location. Note that on multi-monitor systems the origin can be negative.
  Overrides:
  
  getBounds in class Device
  
  Returns:
  
  the bounding rectangle
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getCurrent
  
  public static Display getCurrent()
  
  Returns the display which the currently running thread is the user-interface thread for, or null if the currently running thread is not a user-interface thread for any display.
  
  Returns:
  
  the current display
- getClientArea
  
  public Rectangle getClientArea()
  
  Returns a rectangle which describes the area of the receiver which is capable of displaying data.
  Overrides:
  
  getClientArea in class Device
  
  Returns:
  
  the client area
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  getBounds()
- getCursorControl
  
  public Control getCursorControl()
  
  Returns the control which the on-screen pointer is currently over top of, or null if it is not currently over one of the controls built by the currently running application.
  Returns:
  
  the control under the cursor or null
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getCursorLocation
  
  public Point getCursorLocation()
  
  Returns the location of the on-screen pointer relative to the top left corner of the screen.
  Returns:
  
  the cursor location
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getCursorSizes
  
  public Point[] getCursorSizes()
  
  Returns an array containing the recommended cursor sizes.
  Returns:
  
  the array of cursor sizes
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
- getDefault
  
  public static Display getDefault()
  
  Returns the default display. One is created (making the thread that invokes this method its user-interface thread) if it did not already exist.
  
  Returns:
  
  the default display
- getDeviceZoom
  
  protected int getDeviceZoom()
  
  Description copied from class: Device
  
  Gets the scaling factor from the device and calculates the zoom level.
  
  Overrides:
  
  getDeviceZoom in class Device
  
  Returns:
  
  zoom in percentage
  
  Since:
  
  3.108
- getData
  
  public Object getData(String key)
  
  Returns the application defined property of the receiver with the specified name, or null if it has not been set.
  Applications may have associated arbitrary objects with the receiver in this fashion. If the objects stored in the properties need to be notified when the display is disposed of, it is the application's responsibility to provide a disposeExec() handler which does so.
  Parameters:
  
  key - the name of the property
  
  Returns:
  
  the value of the property or null if it has not been set
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the key is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  setData(String, Object)
  
  disposeExec(Runnable)
- getData
  
  public Object getData()
  
  Returns the application defined, display specific data associated with the receiver, or null if it has not been set. The display specific data is a single, unnamed field that is stored with every display.
  Applications may put arbitrary objects in this field. If the object stored in the display specific data needs to be notified when the display is disposed of, it is the application's responsibility to provide a disposeExec() handler which does so.
  Returns:
  
  the display specific data
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  setData(Object)
  
  disposeExec(Runnable)
- getDismissalAlignment
  
  public int getDismissalAlignment()
  
  Returns the button dismissal alignment, one of LEFT or RIGHT. The button dismissal alignment is the ordering that should be used when positioning the default dismissal button for a dialog. For example, in a dialog that contains an OK and CANCEL button, on platforms where the button dismissal alignment is LEFT, the button ordering should be OK/CANCEL. When button dismissal alignment is RIGHT, the button ordering should be CANCEL/OK.
  Returns:
  
  the button dismissal order
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.1
- getDoubleClickTime
  
  public int getDoubleClickTime()
  
  Returns the longest duration, in milliseconds, between two mouse button clicks that will be considered a double click by the underlying operating system.
  Returns:
  
  the double click time
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getFocusControl
  
  public Control getFocusControl()
  
  Returns the control which currently has keyboard focus, or null if keyboard events are not currently going to any of the controls built by the currently running application.
  Returns:
  
  the focus control or null
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getHighContrast
  
  public boolean getHighContrast()
  
  Returns true when the high contrast mode is enabled. Otherwise, false is returned.
  Note: This operation is a hint and is not supported on platforms that do not have this concept.
  Returns:
  
  the high contrast mode
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
- getIconDepth
  
  public int getIconDepth()
  
  Returns the maximum allowed depth of icons on this display, in bits per pixel. On some platforms, this may be different than the actual depth of the display.
  Returns:
  
  the maximum icon depth
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  Device.getDepth()
- getIconSizes
  
  public Point[] getIconSizes()
  
  Returns an array containing the recommended icon sizes.
  Returns:
  
  the array of icon sizes
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
  
  See Also:
  
  Decorations.setImages(Image[])
- isSystemDarkTheme
  
  public static boolean isSystemDarkTheme()
  
  Returns true if the current OS theme has a dark appearance, else returns false.
  Note: This operation is a hint and is not supported on platforms that do not have this concept.
  
  Note: Windows 10 onwards users can separately configure the theme for OS and Application level and this can be read from the Windows registry. Since the application needs to honor the application level theme, this API reads the Application level theme setting.
  
  Returns:
  
  true if the current OS theme has a dark appearance, else returns false.
  
  Since:
  
  3.112
- getMonitors
  
  public Monitor[] getMonitors()
  
  Returns an array of monitors attached to the device.
  
  Returns:
  
  the array of monitors
  
  Since:
  
  3.0
- getPrimaryMonitor
  
  public Monitor getPrimaryMonitor()
  
  Returns the primary monitor for that device.
  
  Returns:
  
  the primary monitor
  
  Since:
  
  3.0
- getShells
  
  public Shell[] getShells()
  
  Returns a (possibly empty) array containing all shells which have not been disposed and have the receiver as their display.
  Returns:
  
  the receiver's shells
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getSynchronizer
  
  public Synchronizer getSynchronizer()
  
  Gets the synchronizer used by the display.
  Returns:
  
  the receiver's synchronizer
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.4
- getSyncThread
  
  public Thread getSyncThread()
  
  Returns the thread that has invoked syncExec or null if no such runnable is currently being invoked by the user-interface thread.
  Note: If a runnable invoked by asyncExec is currently running, this method will return null.
  Returns:
  
  the receiver's sync-interface thread
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getSystemColor
  
  public Color getSystemColor(int id)
  
  Returns the matching standard color for the given constant, which should be one of the color constants specified in class SWT. Any value other than one of the SWT color constants which is passed in will result in the color black. This color should not be free'd because it was allocated by the system, not the application.
  Overrides:
  
  getSystemColor in class Device
  
  Parameters:
  
  id - the color constant
  
  Returns:
  
  the matching color
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  SWT
- getSystemCursor
  
  public Cursor getSystemCursor(int id)
  
  Returns the matching standard platform cursor for the given constant, which should be one of the cursor constants specified in class SWT. This cursor should not be free'd because it was allocated by the system, not the application. A value of null will be returned if the supplied constant is not an SWT cursor constant.
  Parameters:
  
  id - the SWT cursor constant
  
  Returns:
  
  the corresponding cursor or null
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
  
  See Also:
  
  SWT.CURSOR_ARROW
  
  SWT.CURSOR_WAIT
  
  SWT.CURSOR_CROSS
  
  SWT.CURSOR_APPSTARTING
  
  SWT.CURSOR_HELP
  
  SWT.CURSOR_SIZEALL
  
  SWT.CURSOR_SIZENESW
  
  SWT.CURSOR_SIZENS
  
  SWT.CURSOR_SIZENWSE
  
  SWT.CURSOR_SIZEWE
  
  SWT.CURSOR_SIZEN
  
  SWT.CURSOR_SIZES
  
  SWT.CURSOR_SIZEE
  
  SWT.CURSOR_SIZEW
  
  SWT.CURSOR_SIZENE
  
  SWT.CURSOR_SIZESE
  
  SWT.CURSOR_SIZESW
  
  SWT.CURSOR_SIZENW
  
  SWT.CURSOR_UPARROW
  
  SWT.CURSOR_IBEAM
  
  SWT.CURSOR_NO
  
  SWT.CURSOR_HAND
- getSystemFont
  
  public Font getSystemFont()
  
  Returns a reasonable font for applications to use. On some platforms, this will match the "default font" or "system font" if such can be found. This font should not be free'd because it was allocated by the system, not the application.
  Typically, applications which want the default look should simply not set the font on the widgets they create. Widgets are always created with the correct default font for the class of user-interface component they represent.
  Overrides:
  
  getSystemFont in class Device
  
  Returns:
  
  a font
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getSystemImage
  
  public Image getSystemImage(int id)
  
  Returns the matching standard platform image for the given constant, which should be one of the icon constants specified in class SWT. This image should not be free'd because it was allocated by the system, not the application. A value of null will be returned either if the supplied constant is not an SWT icon constant or if the platform does not define an image that corresponds to the constant.
  Parameters:
  
  id - the SWT icon constant
  
  Returns:
  
  the corresponding image or null
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
  
  See Also:
  
  SWT.ICON_ERROR
  
  SWT.ICON_INFORMATION
  
  SWT.ICON_QUESTION
  
  SWT.ICON_WARNING
  
  SWT.ICON_WORKING
- getSystemMenu
  
  public Menu getSystemMenu()
  
  Returns the single instance of the system-provided menu for the application, or null on platforms where no menu is provided for the application.
  Returns:
  
  the system menu, or null
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.7
- getSystemTaskBar
  
  public TaskBar getSystemTaskBar()
  
  Returns the single instance of the system taskBar or null when there is no system taskBar available for the platform.
  Returns:
  
  the system taskBar or null
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.6
- getSystemTray
  
  public Tray getSystemTray()
  
  Returns the single instance of the system tray or null when there is no system tray available for the platform.
  Returns:
  
  the system tray or null
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
- getThread
  
  public Thread getThread()
  
  Returns the user-interface thread for the receiver.
  Returns:
  
  the receiver's user-interface thread
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
- getTouchEnabled
  
  public boolean getTouchEnabled()
  
  Returns a boolean indicating whether a touch-aware input device is attached to the system and is ready for use.
  Returns:
  
  true if a touch-aware input device is detected, or false otherwise
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.7
- internal_new_GC
  
  public long internal_new_GC(GCData data)
  
  Invokes platform specific functionality to allocate a new GC handle.
  IMPORTANT: This method is not part of the public API for Display. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms, and should never be called from application code.
  Specified by:
  
  internal_new_GC in interface Drawable
  
  Specified by:
  
  internal_new_GC in class Device
  
  Parameters:
  
  data - the platform specific GC data
  
  Returns:
  
  the platform specific GC handle
  
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  SWTError -
  
  ERROR_NO_HANDLES if a handle could not be obtained for gc creation
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- init
  
  protected void init()
  
  Initializes any internal resources needed by the device.
  This method is called after create.
  Overrides:
  
  init in class Device
  
  See Also:
  
  create(org.eclipse.swt.graphics.DeviceData)
- internal_dispose_GC
  
  public void internal_dispose_GC(long hDC, GCData data)
  
  Invokes platform specific functionality to dispose a GC handle.
  IMPORTANT: This method is not part of the public API for Display. It is marked public only so that it can be shared within the packages provided by SWT. It is not available on all platforms, and should never be called from application code.
  
  Specified by:
  
  internal_dispose_GC in interface Drawable
  
  Specified by:
  
  internal_dispose_GC in class Device
  
  Parameters:
  
  hDC - the platform specific GC handle
  
  data - the platform specific GC data
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- map
  
  public Point map(Control from, Control to, Point point)
  
  Maps a point from one coordinate system to another. When the control is null, coordinates are mapped to the display.
  NOTE: On right-to-left platforms where the coordinate systems are mirrored, special care needs to be taken when mapping coordinates from one control to another to ensure the result is correctly mirrored. Mapping a point that is the origin of a rectangle and then adding the width and height is not equivalent to mapping the rectangle. When one control is mirrored and the other is not, adding the width and height to a point that was mapped causes the rectangle to extend in the wrong direction. Mapping the entire rectangle instead of just one point causes both the origin and the corner of the rectangle to be mapped.
  Parameters:
  
  from - the source Control or null
  
  to - the destination Control or null
  
  point - to be mapped
  
  Returns:
  
  point with mapped coordinates
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the point is null
  
  ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.1.2
- map
  
  public Point map(Control from, Control to, int x, int y)
  
  Maps a point from one coordinate system to another. When the control is null, coordinates are mapped to the display.
  NOTE: On right-to-left platforms where the coordinate systems are mirrored, special care needs to be taken when mapping coordinates from one control to another to ensure the result is correctly mirrored. Mapping a point that is the origin of a rectangle and then adding the width and height is not equivalent to mapping the rectangle. When one control is mirrored and the other is not, adding the width and height to a point that was mapped causes the rectangle to extend in the wrong direction. Mapping the entire rectangle instead of just one point causes both the origin and the corner of the rectangle to be mapped.
  Parameters:
  
  from - the source Control or null
  
  to - the destination Control or null
  
  x - coordinates to be mapped
  
  y - coordinates to be mapped
  
  Returns:
  
  point with mapped coordinates
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.1.2
- map
  
  public Rectangle map(Control from, Control to, Rectangle rectangle)
  
  Maps a point from one coordinate system to another. When the control is null, coordinates are mapped to the display.
  NOTE: On right-to-left platforms where the coordinate systems are mirrored, special care needs to be taken when mapping coordinates from one control to another to ensure the result is correctly mirrored. Mapping a point that is the origin of a rectangle and then adding the width and height is not equivalent to mapping the rectangle. When one control is mirrored and the other is not, adding the width and height to a point that was mapped causes the rectangle to extend in the wrong direction. Mapping the entire rectangle instead of just one point causes both the origin and the corner of the rectangle to be mapped.
  Parameters:
  
  from - the source Control or null
  
  to - the destination Control or null
  
  rectangle - to be mapped
  
  Returns:
  
  rectangle with mapped coordinates
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the rectangle is null
  
  ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.1.2
- map
  
  public Rectangle map(Control from, Control to, int x, int y, int width, int height)
  
  Maps a point from one coordinate system to another. When the control is null, coordinates are mapped to the display.
  NOTE: On right-to-left platforms where the coordinate systems are mirrored, special care needs to be taken when mapping coordinates from one control to another to ensure the result is correctly mirrored. Mapping a point that is the origin of a rectangle and then adding the width and height is not equivalent to mapping the rectangle. When one control is mirrored and the other is not, adding the width and height to a point that was mapped causes the rectangle to extend in the wrong direction. Mapping the entire rectangle instead of just one point causes both the origin and the corner of the rectangle to be mapped.
  Parameters:
  
  from - the source Control or null
  
  to - the destination Control or null
  
  x - coordinates to be mapped
  
  y - coordinates to be mapped
  
  width - coordinates to be mapped
  
  height - coordinates to be mapped
  
  Returns:
  
  rectangle with mapped coordinates
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.1.2
- post
  
  public boolean post(Event event)
  Generate a low level system event. post is used to generate low level keyboard and mouse events. The intent is to enable automated UI testing by simulating the input from the user. Most SWT applications should never need to call this method.
  Note that this operation can fail when the operating system fails to generate the event for any reason. For example, this can happen when there is no such key or mouse button or when the system event queue is full.
  
  Event Types:
  KeyDown, KeyUp
  The following fields in the Event apply:
  
  (in) type KeyDown or KeyUp
  
  Either one of:
  
  (in) character a character that corresponds to a keyboard key
  
  (in) keyCode the key code of the key that was typed, as defined by the key code constants in class SWT
  
  Optional (on some platforms):
  
  (in) stateMask the state of the keyboard modifier, as defined by the key code constants in class SWT
  
  MouseDown, MouseUp
  
  The following fields in the Event apply:
  
  (in) type MouseDown or MouseUp
  (in) button the button that is pressed or released
  
  MouseMove
  
  The following fields in the Event apply:
  
  (in) type MouseMove
  
  (in) x the x coordinate to move the mouse pointer to in screen coordinates
  
  (in) y the y coordinate to move the mouse pointer to in screen coordinates
  
  MouseWheel
  
  The following fields in the Event apply:
  
  (in) type MouseWheel
  
  (in) detail either SWT.SCROLL_LINE or SWT.SCROLL_PAGE
  
  (in) count the number of lines or pages to scroll
  Parameters:
  
  event - the event to be generated
  
  Returns:
  
  true if the event was generated or false otherwise
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the event is null
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  3.0
- readAndDispatch
  
  public boolean readAndDispatch()
  
  Reads an event from the operating system's event queue, dispatches it appropriately, and returns true if there is potentially more work to do, or false if the caller can sleep until another event is placed on the event queue.
  In addition to checking the system event queue, this method also checks if any inter-thread messages (created by syncExec() or asyncExec()) are waiting to be processed, and if so handles them before returning.
  Returns:
  
  false if the caller can sleep upon return from this method
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  ERROR_FAILED_EXEC - if an exception occurred while running an inter-thread message
  
  See Also:
  
  sleep()
  
  wake()
- release
  
  protected void release()
  
  Releases any internal resources back to the operating system and clears all fields except the device handle.
  Disposes all shells which are currently open on the display. After this method has been invoked, all related related shells will answer true when sent the message isDisposed().
  When a device is destroyed, resources that were acquired on behalf of the programmer need to be returned to the operating system. For example, if the device allocated a font to be used as the system font, this font would be freed in release. Also,to assist the garbage collector and minimize the amount of memory that is not reclaimed when the programmer keeps a reference to a disposed device, all fields except the handle are zero'd. The handle is needed by destroy.
  This method is called before destroy.
  Overrides:
  
  release in class Device
  
  See Also:
  
  Device.dispose()
  
  destroy()
- removeFilter
  
  public void removeFilter(int eventType, Listener listener)
  
  Removes the listener from the collection of listeners who will be notified when an event of the given type occurs anywhere in a widget. The event type is one of the event constants defined in class SWT.
  Parameters:
  
  eventType - the type of event to listen for
  
  listener - the listener which should no longer be notified when the event occurs
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the listener is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  Since:
  
  3.0
  
  See Also:
  
  Listener
  
  SWT
  
  addFilter(int, org.eclipse.swt.widgets.Listener)
  
  addListener(int, org.eclipse.swt.widgets.Listener)
- removeListener
  
  public void removeListener(int eventType, Listener listener)
  
  Removes the listener from the collection of listeners who will be notified when an event of the given type occurs. The event type is one of the event constants defined in class SWT.
  Parameters:
  
  eventType - the type of event to listen for
  
  listener - the listener which should no longer be notified
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the listener is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.0
  
  See Also:
  
  Listener
  
  SWT
  
  addListener(int, org.eclipse.swt.widgets.Listener)
- sendPreExternalEventDispatchEvent
  
  public void sendPreExternalEventDispatchEvent()
  
  Sends a SWT.PreExternalEventDispatch event.
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- sendPostExternalEventDispatchEvent
  
  public void sendPostExternalEventDispatchEvent()
  
  Sends a SWT.PostExternalEventDispatch event.
  
  Restriction:
  
  This method is not intended to be referenced by clients.
- setCursorLocation
  
  public void setCursorLocation(int x, int y)
  
  Sets the location of the on-screen pointer relative to the top left corner of the screen. Note: It is typically considered bad practice for a program to move the on-screen pointer location.
  Parameters:
  
  x - the new x coordinate for the cursor
  
  y - the new y coordinate for the cursor
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.1
- setCursorLocation
  
  public void setCursorLocation(Point point)
  
  Sets the location of the on-screen pointer relative to the top left corner of the screen. Note: It is typically considered bad practice for a program to move the on-screen pointer location.
  Parameters:
  
  point - new position
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_NULL_ARGUMENT - if the point is null
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  Since:
  
  2.0
- setData
  
  public void setData(String key, Object value)
  
  Sets the application defined property of the receiver with the specified name to the given argument.
  Applications may have associated arbitrary objects with the receiver in this fashion. If the objects stored in the properties need to be notified when the display is disposed of, it is the application's responsibility provide a disposeExec() handler which does so.
  Parameters:
  
  key - the name of the property
  
  value - the new value for the property
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the key is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  getData(String)
  
  disposeExec(Runnable)
- setData
  
  public void setData(Object data)
  
  Sets the application defined, display specific data associated with the receiver, to the argument. The display specific data is a single, unnamed field that is stored with every display.
  Applications may put arbitrary objects in this field. If the object stored in the display specific data needs to be notified when the display is disposed of, it is the application's responsibility provide a disposeExec() handler which does so.
  Parameters:
  
  data - the new display specific data
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  getData()
  
  disposeExec(Runnable)
- getAppName
  
  public static String getAppName()
  
  Returns the application name.
  Returns:
  
  the application name
  
  Since:
  
  3.6
  
  See Also:
  
  setAppName(String)
- getAppVersion
  
  public static String getAppVersion()
  
  Returns the application version.
  Returns:
  
  the application version
  
  Since:
  
  3.6
  
  See Also:
  
  setAppVersion(String)
- setAppName
  
  public static void setAppName(String name)
  
  Sets the application name to the argument.
  The application name can be used in several ways, depending on the platform and tools being used. Accessibility tools could ask for the application name. On Windows, if the application name is set to any value other than "SWT" (case insensitive), it is used to set the application user model ID which is used by the OS for taskbar grouping.
  
  Specifying null for the name clears it.
  Parameters:
  
  name - the new app name or null
  
  See Also:
  
  AppUserModelID (Windows)
- setAppVersion
  
  public static void setAppVersion(String version)
  
  Sets the application version to the argument.
  
  Parameters:
  
  version - the new app version
  
  Since:
  
  3.6
- setSynchronizer
  
  public void setSynchronizer(Synchronizer synchronizer)
  
  Sets the synchronizer used by the display to be the argument, which can not be null.
  Parameters:
  
  synchronizer - the new synchronizer for the display (must not be null)
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the synchronizer is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  ERROR_FAILED_EXEC - if an exception occurred while running an inter-thread message
- setRuntimeExceptionHandler
  
  public final void setRuntimeExceptionHandler(Consumer<RuntimeException> runtimeExceptionHandler)
  
  Sets a callback that will be invoked whenever an exception is thrown by a listener or external callback function. The application may use this to set a global exception handling policy: the most common policies are either to log and discard the exception or to re-throw the exception.
  The default SWT error handling policy is to rethrow exceptions.
  
  Parameters:
  
  runtimeExceptionHandler - new exception handler to be registered.
  
  Since:
  
  3.106
- getRuntimeExceptionHandler
  
  public final Consumer<RuntimeException> getRuntimeExceptionHandler()
  
  Returns the current exception handler. It will receive all exceptions thrown by listeners and external callbacks in this display. If code wishes to temporarily replace the exception handler (for example, during a unit test), it is common practice to invoke this method prior to replacing the exception handler so that the old handler may be restored afterward.
  
  Returns:
  
  the current exception handler. Never null.
  
  Since:
  
  3.106
- setErrorHandler
  
  public final void setErrorHandler(Consumer<Error> errorHandler)
  
  Sets a callback that will be invoked whenever an error is thrown by a listener or external callback function. The application may use this to set a global exception handling policy: the most common policies are either to log and discard the exception or to re-throw the exception.
  The default SWT error handling policy is to rethrow exceptions.
  
  Parameters:
  
  errorHandler - new error handler to be registered.
  
  Since:
  
  3.106
- getErrorHandler
  
  public final Consumer<Error> getErrorHandler()
  
  Returns the current exception handler. It will receive all errors thrown by listeners and external callbacks in this display. If code wishes to temporarily replace the error handler (for example, during a unit test), it is common practice to invoke this method prior to replacing the error handler so that the old handler may be restored afterward.
  
  Returns:
  
  the current error handler. Never null.
  
  Since:
  
  3.106
- sleep
  
  public boolean sleep()
  
  Causes the user-interface thread to sleep (that is, to be put in a state where it does not consume CPU cycles) until an event is received or it is otherwise awakened.
  Returns:
  
  true if an event requiring dispatching was placed on the queue.
  
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  wake()
- syncExec
  
  public void syncExec(Runnable runnable)
  
  Causes the run() method of the runnable to be invoked by the user-interface thread at the next reasonable opportunity. The thread which calls this method is suspended until the runnable completes. Specifying null as the runnable simply wakes the user-interface thread.
  Note that at the time the runnable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is necessary to check for this case inside the runnable before accessing the widget.
  Parameters:
  
  runnable - code to run on the user-interface thread or null
  
  Throws:
  
  SWTException -
  
  ERROR_FAILED_EXEC - if an exception occurred when executing the runnable
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  asyncExec(java.lang.Runnable)
- syncCall
  
  public <T, E extends Exception> T syncCall(SwtCallable<T,E> callable) throws E
  
  Calls the callable on the user-interface thread at the next reasonable opportunity, and returns the its result from this method. The thread which calls this method is suspended until the callable completes.
  Note that at the time the callable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is necessary to check for this case inside the callable before accessing the widget.
  
  Any exception that is thrown from the callable is re-thrown in the calling thread. Note: The exception retains its original stack trace from the throwing thread. The call to syncCall will not be present in the stack trace.
  Parameters:
  
  callable - the code to call on the user-interface thread
  
  Throws:
  
  SWTException - ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  E - An exception that is thrown by the callable on the user-interface thread, and re-thrown on the calling thread
  
  Since:
  
  3.118
  
  See Also:
  
  syncExec(Runnable)
  
  SwtCallable.call()
- timerExec
  
  public void timerExec(int milliseconds, Runnable runnable)
  
  Causes the run() method of the runnable to be invoked by the user-interface thread after the specified number of milliseconds have elapsed. If milliseconds is less than zero, the runnable is not executed.
  Note that at the time the runnable is invoked, widgets that have the receiver as their display may have been disposed. Therefore, it is necessary to check for this case inside the runnable before accessing the widget.
  Parameters:
  
  milliseconds - the delay before running the runnable
  
  runnable - code to run on the user-interface thread
  
  Throws:
  
  IllegalArgumentException -
  
  ERROR_NULL_ARGUMENT - if the runnable is null
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  asyncExec(java.lang.Runnable)
- update
  
  public void update()
  
  Forces all outstanding paint requests for the display to be processed before this method returns.
  Throws:
  
  SWTException -
  
  ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  Control.update()
- wake
  
  public void wake()
  
  If the receiver's user-interface thread was sleeping, causes it to be awakened and start running again. Note that this method may be called from any thread.
  Throws:
  
  SWTException -
  
  ERROR_DEVICE_DISPOSED - if the receiver has been disposed
  
  See Also:
  
  sleep()
- isRescalingAtRuntime
  
  public boolean isRescalingAtRuntime()
  
  Returns whether rescaling of shells at runtime when the DPI scaling of a shell's monitor changes is activated for this device.
  Note: This functionality is only available on Windows. Calling this method on other operating system will always return false.
  
  Returns:
  
  whether rescaling of shells at runtime when the DPI scaling of a shell's monitor changes is activated for this device
  
  Since:
  
  3.127
- setRescalingAtRuntime
  
  public boolean setRescalingAtRuntime(boolean activate)
  
  Activates or deactivates rescaling of shells at runtime whenever the DPI scaling of the shell's monitor changes. This is only safe to call as long as no shell has been created for this display. When changing the value after a shell has been created for this display, the effect is undefined.
  Note: This functionality is only available on Windows. Calling this method on other operating system will have no effect.
  
  Parameters:
  
  activate - whether rescaling shall be activated or deactivated
  
  Returns:
  
  whether activating or deactivating the rescaling was successful
  
  Since:
  
  3.127

Class Display

Field Summary

Fields inherited from class org.eclipse.swt.graphics.Device

Constructor Summary

Method Summary

Methods inherited from class org.eclipse.swt.graphics.Device

Methods inherited from class java.lang.Object

Methods inherited from interface org.eclipse.swt.graphics.Drawable

Field Details

msg

Constructor Details

Display

Display

Method Details

addFilter

addListener

asyncExec

execute

beep

checkSubclass

checkDevice

close

create

destroy

disposeExec

findWidget

findWidget

findWidget

findDisplay

getActiveShell

getMenuBar

getBounds

getCurrent

getClientArea

getCursorControl

getCursorLocation

getCursorSizes

getDefault

getDeviceZoom

getData

getData

getDismissalAlignment

getDoubleClickTime

getFocusControl

getHighContrast

getIconDepth

getIconSizes

isSystemDarkTheme

getMonitors

getPrimaryMonitor

getShells

getSynchronizer

getSyncThread

getSystemColor

getSystemCursor

getSystemFont

getSystemImage

getSystemMenu

getSystemTaskBar

getSystemTray

getThread

getTouchEnabled

internal_new_GC

init

internal_dispose_GC

map

map

map

map

post

readAndDispatch

release

removeFilter

removeListener

sendPreExternalEventDispatchEvent

sendPostExternalEventDispatchEvent

setCursorLocation

setCursorLocation

setData

setData