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java.lang.Objectorg.eclipse.swt.graphics.Device
org.eclipse.swt.widgets.Display
public class Display
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.
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.)
Display
s 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.)
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.
IMPORTANT: This class is not intended to be subclassed.
syncExec(java.lang.Runnable)
,
asyncExec(java.lang.Runnable)
,
wake
,
readAndDispatch()
,
sleep()
,
Device.dispose()
,
Display snippets,
Sample code and further informationField Summary |
---|
Fields inherited from class org.eclipse.swt.graphics.Device |
---|
CurrentDevice, DEBUG, DeviceFinder, xDisplay |
Constructor Summary | |
---|---|
Display()
Constructs a new instance of this class. |
|
Display(DeviceData data)
Constructs a new instance of this class using the parameter. |
Method Summary | |
---|---|
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(java.lang.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(java.lang.Runnable runnable)
Causes the run() method of the runnable to
be invoked by the user-interface thread just before the
receiver is disposed. |
static Display |
findDisplay(java.lang.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. |
Rectangle |
getBounds()
Returns a rectangle describing the receiver's size and location. |
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. |
java.lang.Object |
getData()
Returns the application defined, display specific data associated with the receiver, or null if it has not been set. |
java.lang.Object |
getData(java.lang.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. |
int |
getDepth()
Returns the bit depth of the screen, which is the number of bits it takes to represent the number of unique colors that the screen is currently capable of displaying. |
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. |
Point |
getDPI()
Returns a point whose x coordinate is the horizontal dots per inch of the display, and whose y coordinate is the vertical dots per inch of the display. |
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. |
Monitor[] |
getMonitors()
Returns an array of monitors attached to the device. |
Monitor |
getPrimaryMonitor()
Returns the primary monitor for that device. |
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. |
java.lang.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 . |
Tray |
getSystemTray()
Returns the single instance of the system tray or null when there is no system tray available for the platform. |
java.lang.Thread |
getThread()
Returns the user-interface thread for the receiver. |
protected void |
init()
Initializes any internal resources needed by the device. |
void |
internal_dispose_GC(long gdkGC,
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. |
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. |
static void |
setAppName(java.lang.String name)
On platforms which support it, sets the application name to be 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(java.lang.Object data)
Sets the application defined, display specific data associated with the receiver, to the argument. |
void |
setData(java.lang.String key,
java.lang.Object value)
Sets the application defined property of the receiver with the specified name to the given argument. |
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. |
void |
syncExec(java.lang.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,
java.lang.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 sleep ing,
causes it to be awakened and start running again. |
Methods inherited from class org.eclipse.swt.graphics.Device |
---|
dispose, getClientArea, getDeviceData, getFontList, getWarnings, isDisposed, loadFont, setWarnings |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public Display()
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.
SWTException
- getCurrent()
,
getDefault()
,
Widget.checkSubclass()
,
Shell
public Display(DeviceData data)
data
- the device dataMethod Detail |
---|
public void addFilter(int eventType, Listener listener)
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.
eventType
- the type of event to listen forlistener
- the listener which should be notified when the event occurs
java.lang.IllegalArgumentException
- SWTException
- Listener
,
SWT
,
removeFilter(int, org.eclipse.swt.widgets.Listener)
,
removeListener(int, org.eclipse.swt.widgets.Listener)
public void addListener(int eventType, Listener listener)
SWT
.
When the event does occur in the display, the listener is notified by
sending it the handleEvent()
message.
eventType
- the type of event to listen forlistener
- the listener which should be notified when the event occurs
java.lang.IllegalArgumentException
- SWTException
- Listener
,
SWT
,
removeListener(int, org.eclipse.swt.widgets.Listener)
public void asyncExec(java.lang.Runnable runnable)
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.
runnable
- code to run on the user-interface thread or null
SWTException
- syncExec(java.lang.Runnable)
public void beep()
SWTException
- protected void checkDevice()
Device
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.
checkDevice
in class Device
protected void checkSubclass()
IMPORTANT: See the comment in Widget.checkSubclass()
.
SWTException
- Widget.checkSubclass()
public void close()
SWTException
- Device.dispose()
protected void create(DeviceData data)
This method is called before init
.
create
in class Device
data
- the DeviceData which describes the receiverinit()
protected void destroy()
This method is called after release
.
destroy
in class Device
Device.dispose()
,
release()
public static Display findDisplay(java.lang.Thread thread)
null
as the thread will return null
for the display.
thread
- the user-interface thread
public void disposeExec(java.lang.Runnable runnable)
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.
runnable
- code to run at dispose time.
SWTException
- public Widget findWidget(long handle)
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.
handle
- the handle for the widget
SWTException
- public Widget findWidget(long handle, long id)
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.
handle
- the handle for the widgetid
- the id for the subwidget (usually an item)
SWTException
- public Widget findWidget(Widget widget, long id)
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.
widget
- the widgetid
- the id for the subwidget (usually an item)
SWTException
- public Shell getActiveShell()
Shell
, or null
if no shell belonging to the currently running application
is active.
SWTException
- public Rectangle getBounds()
getBounds
in class Device
SWTException
- public static Display getCurrent()
public Control getCursorControl()
SWTException
- public Point getCursorLocation()
SWTException
- public Point[] getCursorSizes()
SWTException
- public java.lang.Object getData(java.lang.String key)
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.
key
- the name of the property
java.lang.IllegalArgumentException
- SWTException
- setData(String, Object)
,
disposeExec(Runnable)
public java.lang.Object getData()
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.
SWTException
- setData(Object)
,
disposeExec(Runnable)
public Point getDPI()
getDPI
in class Device
SWTException
- public static Display getDefault()
public int getDismissalAlignment()
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.
SWTException
- public int getDoubleClickTime()
SWTException
- public Control getFocusControl()
SWTException
- public boolean getHighContrast()
Note: This operation is a hint and is not supported on platforms that do not have this concept.
SWTException
- public int getDepth()
Device
getDepth
in class Device
public int getIconDepth()
SWTException
- Device.getDepth()
public Point[] getIconSizes()
SWTException
- Decorations.setImages(Image[])
public Monitor[] getMonitors()
public Monitor getPrimaryMonitor()
public Shell[] getShells()
SWTException
- public Synchronizer getSynchronizer()
SWTException
- public java.lang.Thread getSyncThread()
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.
SWTException
- public Color getSystemColor(int id)
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.
getSystemColor
in class Device
id
- the color constant
SWTException
- SWT
public Cursor getSystemCursor(int id)
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.
id
- the SWT cursor constant
null
SWTException
- 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
public Image getSystemImage(int id)
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.
id
- the SWT icon constant
null
SWTException
- SWT.ICON_ERROR
,
SWT.ICON_INFORMATION
,
SWT.ICON_QUESTION
,
SWT.ICON_WARNING
,
SWT.ICON_WORKING
public Font getSystemFont()
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.
getSystemFont
in class Device
SWTException
- public Tray getSystemTray()
null
SWTException
- public java.lang.Thread getThread()
SWTException
- protected void init()
This method is called after create
.
init
in class Device
create(org.eclipse.swt.graphics.DeviceData)
public void internal_dispose_GC(long gdkGC, GCData data)
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.
internal_dispose_GC
in interface Drawable
internal_dispose_GC
in class Device
hDC
- the platform specific GC handledata
- the platform specific GC datapublic long internal_new_GC(GCData data)
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.
internal_new_GC
in interface Drawable
internal_new_GC
in class Device
data
- the platform specific GC data
SWTException
- SWTError
- public Point map(Control from, Control to, Point point)
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.
from
- the source Control
or null
to
- the destination Control
or null
point
- to be mapped
java.lang.IllegalArgumentException
- SWTException
- public Point map(Control from, Control to, int x, int y)
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.
from
- the source Control
or null
to
- the destination Control
or null
x
- coordinates to be mappedy
- coordinates to be mapped
java.lang.IllegalArgumentException
- SWTException
- public Rectangle map(Control from, Control to, Rectangle rectangle)
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.
from
- the source Control
or null
to
- the destination Control
or null
rectangle
- to be mapped
java.lang.IllegalArgumentException
- SWTException
- public Rectangle map(Control from, Control to, int x, int y, int width, int height)
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.
from
- the source Control
or null
to
- the destination Control
or null
x
- coordinates to be mappedy
- coordinates to be mappedwidth
- coordinates to be mappedheight
- coordinates to be mapped
java.lang.IllegalArgumentException
- SWTException
- public boolean post(Event 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:
Either one of:
SWT
MouseDown, MouseUp
The following fields in the Event
apply:
MouseMove
The following fields in the Event
apply:
event
- the event to be generated
java.lang.IllegalArgumentException
- SWTException
- public boolean readAndDispatch()
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.
false
if the caller can sleep upon return from this method
SWTException
- sleep()
,
wake
protected void release()
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
.
destroy
.
release
in class Device
Device.dispose()
,
destroy()
public void removeFilter(int eventType, Listener listener)
SWT
.
eventType
- the type of event to listen forlistener
- the listener which should no longer be notified when the event occurs
java.lang.IllegalArgumentException
- SWTException
- Listener
,
SWT
,
addFilter(int, org.eclipse.swt.widgets.Listener)
,
addListener(int, org.eclipse.swt.widgets.Listener)
public void removeListener(int eventType, Listener listener)
SWT
.
eventType
- the type of event to listen forlistener
- the listener which should no longer be notified
java.lang.IllegalArgumentException
- SWTException
- Listener
,
SWT
,
addListener(int, org.eclipse.swt.widgets.Listener)
public static void setAppName(java.lang.String name)
null
for the name clears it.
name
- the new app name or null
public void setCursorLocation(int x, int y)
x
- the new x coordinate for the cursory
- the new y coordinate for the cursor
SWTException
- public void setCursorLocation(Point point)
point
- new position
SWTException
- public void setData(java.lang.String key, java.lang.Object value)
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.
key
- the name of the propertyvalue
- the new value for the property
java.lang.IllegalArgumentException
- SWTException
- getData(String)
,
disposeExec(Runnable)
public void setData(java.lang.Object data)
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.
data
- the new display specific data
SWTException
- getData()
,
disposeExec(Runnable)
public void setSynchronizer(Synchronizer synchronizer)
synchronizer
- the new synchronizer for the display (must not be null)
java.lang.IllegalArgumentException
- SWTException
- public boolean sleep()
true
if an event requiring dispatching was placed on the queue.
SWTException
- wake
public void timerExec(int milliseconds, java.lang.Runnable runnable)
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.
milliseconds
- the delay before running the runnablerunnable
- code to run on the user-interface thread
java.lang.IllegalArgumentException
- SWTException
- asyncExec(java.lang.Runnable)
public void syncExec(java.lang.Runnable runnable)
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.
runnable
- code to run on the user-interface thread or null
SWTException
- asyncExec(java.lang.Runnable)
public void update()
SWTException
- Control.update()
public void wake()
sleep
ing,
causes it to be awakened and start running again. Note that this
method may be called from any thread.
SWTException
- sleep()
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