public class SwingUtilities extends Object implements SwingConstants
BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NEXT, NORTH, NORTH_EAST, NORTH_WEST, PREVIOUS, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST
Modifier and Type | Method and Description |
---|---|
static Rectangle |
calculateInnerArea(JComponent c,
Rectangle r)
Stores the position and size of
the inner painting area of the specified component
in
r and returns r . |
static Rectangle[] |
computeDifference(Rectangle rectA,
Rectangle rectB)
Convenience returning an array of rect representing the regions within
rectA that do not overlap with rectB . |
static Rectangle |
computeIntersection(int x,
int y,
int width,
int height,
Rectangle dest)
Convenience to calculate the intersection of two rectangles
without allocating a new rectangle.
|
static int |
computeStringWidth(FontMetrics fm,
String str)
Compute the width of the string using a font with the specified
"metrics" (sizes).
|
static Rectangle |
computeUnion(int x,
int y,
int width,
int height,
Rectangle dest)
Convenience method that calculates the union of two rectangles
without allocating a new rectangle.
|
static MouseEvent |
convertMouseEvent(Component source,
MouseEvent sourceEvent,
Component destination)
Returns a MouseEvent similar to
sourceEvent except that its x
and y members have been converted to destination 's coordinate
system. |
static Point |
convertPoint(Component source,
int x,
int y,
Component destination)
Convert the point
(x,y) in source coordinate system to
destination coordinate system. |
static Point |
convertPoint(Component source,
Point aPoint,
Component destination)
Convert a
aPoint in source coordinate system to
destination coordinate system. |
static void |
convertPointFromScreen(Point p,
Component c)
Convert a point from a screen coordinates to a component's
coordinate system
|
static void |
convertPointToScreen(Point p,
Component c)
Convert a point from a component's coordinate system to
screen coordinates.
|
static Rectangle |
convertRectangle(Component source,
Rectangle aRectangle,
Component destination)
Convert the rectangle
aRectangle in source coordinate system to
destination coordinate system. |
static Component |
findFocusOwner(Component c)
Deprecated.
As of 1.4, replaced by
KeyboardFocusManager.getFocusOwner() . |
static Accessible |
getAccessibleAt(Component c,
Point p)
Returns the
Accessible child contained at the
local coordinate Point , if one exists. |
static Accessible |
getAccessibleChild(Component c,
int i)
Return the nth Accessible child of the object.
|
static int |
getAccessibleChildrenCount(Component c)
Returns the number of accessible children in the object.
|
static int |
getAccessibleIndexInParent(Component c)
Get the index of this object in its accessible parent.
|
static AccessibleStateSet |
getAccessibleStateSet(Component c)
Get the state of this object.
|
static Container |
getAncestorNamed(String name,
Component comp)
Convenience method for searching above
comp in the
component hierarchy and returns the first object of name it
finds. |
static Container |
getAncestorOfClass(Class<?> c,
Component comp)
Convenience method for searching above
comp in the
component hierarchy and returns the first object of class c it
finds. |
static Component |
getDeepestComponentAt(Component parent,
int x,
int y)
Returns the deepest visible descendent Component of
parent
that contains the location x , y . |
static Rectangle |
getLocalBounds(Component aComponent)
Return the rectangle (0,0,bounds.width,bounds.height) for the component
aComponent |
static Component |
getRoot(Component c)
Returns the root component for the current component tree.
|
static JRootPane |
getRootPane(Component c)
If c is a JRootPane descendant return its JRootPane ancestor.
|
static ActionMap |
getUIActionMap(JComponent component)
Returns the ActionMap provided by the UI
in component
component . |
static InputMap |
getUIInputMap(JComponent component,
int condition)
Returns the InputMap provided by the UI for condition
condition in component component . |
static Container |
getUnwrappedParent(Component component)
Returns the first ancestor of the
component
which is not an instance of JLayer . |
static Component |
getUnwrappedView(JViewport viewport)
Returns the first
JViewport 's descendant
which is not an instance of JLayer . |
static Window |
getWindowAncestor(Component c)
Returns the first
Window ancestor of c , or
null if c is not contained inside a Window . |
static void |
invokeAndWait(Runnable doRun)
Causes
doRun.run() to be executed synchronously on the
AWT event dispatching thread. |
static void |
invokeLater(Runnable doRun)
Causes doRun.run() to be executed asynchronously on the
AWT event dispatching thread.
|
static boolean |
isDescendingFrom(Component a,
Component b)
Return
true if a component a descends from a component b |
static boolean |
isEventDispatchThread()
Returns true if the current thread is an AWT event dispatching thread.
|
static boolean |
isLeftMouseButton(MouseEvent anEvent)
Returns true if the mouse event specifies the left mouse button.
|
static boolean |
isMiddleMouseButton(MouseEvent anEvent)
Returns true if the mouse event specifies the middle mouse button.
|
static boolean |
isRectangleContainingRectangle(Rectangle a,
Rectangle b)
Return true if
a contains b |
static boolean |
isRightMouseButton(MouseEvent anEvent)
Returns true if the mouse event specifies the right mouse button.
|
static String |
layoutCompoundLabel(FontMetrics fm,
String text,
Icon icon,
int verticalAlignment,
int horizontalAlignment,
int verticalTextPosition,
int horizontalTextPosition,
Rectangle viewR,
Rectangle iconR,
Rectangle textR,
int textIconGap)
Compute and return the location of the icons origin, the
location of origin of the text baseline, and a possibly clipped
version of the compound labels string.
|
static String |
layoutCompoundLabel(JComponent c,
FontMetrics fm,
String text,
Icon icon,
int verticalAlignment,
int horizontalAlignment,
int verticalTextPosition,
int horizontalTextPosition,
Rectangle viewR,
Rectangle iconR,
Rectangle textR,
int textIconGap)
Compute and return the location of the icons origin, the
location of origin of the text baseline, and a possibly clipped
version of the compound labels string.
|
static boolean |
notifyAction(Action action,
KeyStroke ks,
KeyEvent event,
Object sender,
int modifiers)
Invokes
actionPerformed on action if
action is enabled (and non-null ). |
static void |
paintComponent(Graphics g,
Component c,
Container p,
int x,
int y,
int w,
int h)
Paints a component to the specified
Graphics . |
static void |
paintComponent(Graphics g,
Component c,
Container p,
Rectangle r)
Paints a component to the specified
Graphics . |
static boolean |
processKeyBindings(KeyEvent event)
Process the key bindings for the
Component associated with
event . |
static void |
replaceUIActionMap(JComponent component,
ActionMap uiActionMap)
Convenience method to change the UI ActionMap for
component
to uiActionMap . |
static void |
replaceUIInputMap(JComponent component,
int type,
InputMap uiInputMap)
Convenience method to change the UI InputMap for
component
to uiInputMap . |
static void |
updateComponentTreeUI(Component c)
A simple minded look and feel change: ask each node in the tree
to
updateUI() -- that is, to initialize its UI property
with the current look and feel. |
static Window |
windowForComponent(Component c)
Returns the first
Window ancestor of c , or
null if c is not contained inside a Window . |
public static final boolean isRectangleContainingRectangle(Rectangle a, Rectangle b)
a
contains b
public static Rectangle getLocalBounds(Component aComponent)
aComponent
public static Window getWindowAncestor(Component c)
Window
ancestor of c
, or
null
if c
is not contained inside a Window
.c
- Component
to get Window
ancestor
of.Window
ancestor of c
, or
null
if c
is not contained inside a
Window
.public static Point convertPoint(Component source, Point aPoint, Component destination)
aPoint
in source
coordinate system to
destination
coordinate system.
If source
is null
, aPoint
is assumed to be in destination
's
root component coordinate system.
If destination
is null
, aPoint
will be converted to source
's
root component coordinate system.
If both source
and destination
are null
, return aPoint
without any conversion.public static Point convertPoint(Component source, int x, int y, Component destination)
(x,y)
in source
coordinate system to
destination
coordinate system.
If source
is null
, (x,y)
is assumed to be in destination
's
root component coordinate system.
If destination
is null
, (x,y)
will be converted to source
's
root component coordinate system.
If both source
and destination
are null
, return (x,y)
without any conversion.public static Rectangle convertRectangle(Component source, Rectangle aRectangle, Component destination)
aRectangle
in source
coordinate system to
destination
coordinate system.
If source
is null
, aRectangle
is assumed to be in destination
's
root component coordinate system.
If destination
is null
, aRectangle
will be converted to source
's
root component coordinate system.
If both source
and destination
are null
, return aRectangle
without any conversion.public static Container getAncestorOfClass(Class<?> c, Component comp)
comp
in the
component hierarchy and returns the first object of class c
it
finds. Can return null
, if a class c
cannot be found.public static Container getAncestorNamed(String name, Component comp)
comp
in the
component hierarchy and returns the first object of name
it
finds. Can return null
, if name
cannot be found.public static Component getDeepestComponentAt(Component parent, int x, int y)
parent
that contains the location x
, y
.
If parent
does not contain the specified location,
then null
is returned. If parent
is not a
container, or none of parent
's visible descendents
contain the specified location, parent
is returned.parent
- the root component to begin the searchx
- the x target locationy
- the y target locationpublic static MouseEvent convertMouseEvent(Component source, MouseEvent sourceEvent, Component destination)
sourceEvent
except that its x
and y members have been converted to destination
's coordinate
system. If source
is null
, sourceEvent
x and y members
are assumed to be into destination
's root component coordinate system.
If destination
is null
, the
returned MouseEvent will be in source
's coordinate system.
sourceEvent
will not be changed. A new event is returned.
the source
field of the returned event will be set
to destination
if destination is non-null
use the translateMouseEvent() method to translate a mouse event from
one component to another without changing the source.public static void convertPointToScreen(Point p, Component c)
p
- a Point object (converted to the new coordinate system)c
- a Component objectpublic static void convertPointFromScreen(Point p, Component c)
p
- a Point object (converted to the new coordinate system)c
- a Component objectpublic static Window windowForComponent(Component c)
Window
ancestor of c
, or
null
if c
is not contained inside a Window
.
Note: This method provides the same functionality as
getWindowAncestor
.
c
- Component
to get Window
ancestor
of.Window
ancestor of c
, or
null
if c
is not contained inside a
Window
.public static boolean isDescendingFrom(Component a, Component b)
true
if a component a
descends from a component b
public static Rectangle computeIntersection(int x, int y, int width, int height, Rectangle dest)
x
- the X coordinate of the first rectangle's top-left pointy
- the Y coordinate of the first rectangle's top-left pointwidth
- the width of the first rectangleheight
- the height of the first rectangledest
- the second rectangledest
, modified to specify the intersectionpublic static Rectangle computeUnion(int x, int y, int width, int height, Rectangle dest)
x
- the x-coordinate of the first rectangley
- the y-coordinate of the first rectanglewidth
- the width of the first rectangleheight
- the height of the first rectangledest
- the coordinates of the second rectangle; the union
of the two rectangles is returned in this rectangledest
Rectangle
public static Rectangle[] computeDifference(Rectangle rectA, Rectangle rectB)
rectA
that do not overlap with rectB
. If the
two Rects do not overlap, returns an empty arraypublic static boolean isLeftMouseButton(MouseEvent anEvent)
anEvent
- a MouseEvent objectpublic static boolean isMiddleMouseButton(MouseEvent anEvent)
anEvent
- a MouseEvent objectpublic static boolean isRightMouseButton(MouseEvent anEvent)
anEvent
- a MouseEvent objectpublic static int computeStringWidth(FontMetrics fm, String str)
fm
- a FontMetrics object to compute withstr
- the String to computepublic static String layoutCompoundLabel(JComponent c, FontMetrics fm, String text, Icon icon, int verticalAlignment, int horizontalAlignment, int verticalTextPosition, int horizontalTextPosition, Rectangle viewR, Rectangle iconR, Rectangle textR, int textIconGap)
public static String layoutCompoundLabel(FontMetrics fm, String text, Icon icon, int verticalAlignment, int horizontalAlignment, int verticalTextPosition, int horizontalTextPosition, Rectangle viewR, Rectangle iconR, Rectangle textR, int textIconGap)
public static void paintComponent(Graphics g, Component c, Container p, int x, int y, int w, int h)
Graphics
.
This method is primarily useful to render
Component
s that don't exist as part of the visible
containment hierarchy, but are used for rendering. For
example, if you are doing your own rendering and want to render
some text (or even HTML), you could make use of
JLabel
's text rendering support and have it paint
directly by way of this method, without adding the label to the
visible containment hierarchy.
This method makes use of CellRendererPane
to handle
the actual painting, and is only recommended if you use one
component for rendering. If you make use of multiple components
to handle the rendering, as JTable
does, use
CellRendererPane
directly. Otherwise, as described
below, you could end up with a CellRendererPane
per Component
.
If c
's parent is not a CellRendererPane
,
a new CellRendererPane
is created, c
is
added to it, and the CellRendererPane
is added to
p
. If c
's parent is a
CellRendererPane
and the CellRendererPane
s
parent is not p
, it is added to p
.
The component should either descend from JComponent
or be another kind of lightweight component.
A lightweight component is one whose "lightweight" property
(returned by the Component
isLightweight
method)
is true. If the Component is not lightweight, bad things map happen:
crashes, exceptions, painting problems...
g
- the Graphics
object to draw onc
- the Component
to drawp
- the intermediate Container
x
- an int specifying the left side of the area draw in, in pixels,
measured from the left edge of the graphics contexty
- an int specifying the top of the area to draw in, in pixels
measured down from the top edge of the graphics contextw
- an int specifying the width of the area draw in, in pixelsh
- an int specifying the height of the area draw in, in pixelsCellRendererPane
,
Component.isLightweight()
public static void paintComponent(Graphics g, Component c, Container p, Rectangle r)
Graphics
. This
is a cover method for
paintComponent(Graphics,Component,Container,int,int,int,int)
.
Refer to it for more information.g
- the Graphics
object to draw onc
- the Component
to drawp
- the intermediate Container
r
- the Rectangle
to draw inpaintComponent(Graphics,Component,Container,int,int,int,int)
,
CellRendererPane
public static void updateComponentTreeUI(Component c)
updateUI()
-- that is, to initialize its UI property
with the current look and feel.public static void invokeLater(Runnable doRun)
invokeLater
call queues
the Runnable
object doHelloWorld
on the event dispatching thread and
then prints a message.
Runnable doHelloWorld = new Runnable() { public void run() { System.out.println("Hello World on " + Thread.currentThread()); } }; SwingUtilities.invokeLater(doHelloWorld); System.out.println("This might well be displayed before the other message.");If invokeLater is called from the event dispatching thread -- for example, from a JButton's ActionListener -- the doRun.run() will still be deferred until all pending events have been processed. Note that if the doRun.run() throws an uncaught exception the event dispatching thread will unwind (not the current thread).
Additional documentation and examples for this method can be found in How to Use Threads, in The Java Tutorial.
As of 1.3 this method is just a cover for java.awt.EventQueue.invokeLater()
.
Unlike the rest of Swing, this method can be invoked from any thread.
invokeAndWait(java.lang.Runnable)
public static void invokeAndWait(Runnable doRun) throws InterruptedException, InvocationTargetException
doRun.run()
to be executed synchronously on the
AWT event dispatching thread. This call blocks until
all pending AWT events have been processed and (then)
doRun.run()
returns. This method should
be used when an application thread needs to update the GUI.
It shouldn't be called from the event dispatching thread.
Here's an example that creates a new application thread
that uses invokeAndWait
to print a string from the event
dispatching thread and then, when that's finished, print
a string from the application thread.
final Runnable doHelloWorld = new Runnable() { public void run() { System.out.println("Hello World on " + Thread.currentThread()); } }; Thread appThread = new Thread() { public void run() { try { SwingUtilities.invokeAndWait(doHelloWorld); } catch (Exception e) { e.printStackTrace(); } System.out.println("Finished on " + Thread.currentThread()); } }; appThread.start();Note that if the
Runnable.run
method throws an
uncaught exception
(on the event dispatching thread) it's caught and rethrown, as
an InvocationTargetException
, on the caller's thread.
Additional documentation and examples for this method can be found in How to Use Threads, in The Java Tutorial.
As of 1.3 this method is just a cover for
java.awt.EventQueue.invokeAndWait()
.
InterruptedException
- if we're interrupted while waiting for
the event dispatching thread to finish excecuting
doRun.run()
InvocationTargetException
- if an exception is thrown
while running doRun
invokeLater(java.lang.Runnable)
public static boolean isEventDispatchThread()
As of 1.3 this method is just a cover for
java.awt.EventQueue.isDispatchThread()
.
public static int getAccessibleIndexInParent(Component c)
Note: as of the Java 2 platform v1.3, it is recommended that developers call Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead of using this method.
public static Accessible getAccessibleAt(Component c, Point p)
Accessible
child contained at the
local coordinate Point
, if one exists.
Otherwise returns null
.Accessible
at the specified location,
if it exists; otherwise null
public static AccessibleStateSet getAccessibleStateSet(Component c)
Note: as of the Java 2 platform v1.3, it is recommended that developers call Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead of using this method.
AccessibleState
public static int getAccessibleChildrenCount(Component c)
Note: as of the Java 2 platform v1.3, it is recommended that developers call Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead of using this method.
public static Accessible getAccessibleChild(Component c, int i)
Note: as of the Java 2 platform v1.3, it is recommended that developers call Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead of using this method.
i
- zero-based index of child@Deprecated public static Component findFocusOwner(Component c)
KeyboardFocusManager.getFocusOwner()
.Component
of the specified
Component
that is the focus owner, if any.c
- the root of the Component
hierarchy to
search for the focus ownernull
if there is no focus
owner, or if the focus owner is not comp
, or a
descendant of comp
KeyboardFocusManager.getFocusOwner()
public static JRootPane getRootPane(Component c)
null
.public static Component getRoot(Component c)
public static boolean processKeyBindings(KeyEvent event)
Component
associated with
event
. This method is only useful if
event.getComponent()
does not descend from
JComponent
, or your are not invoking
super.processKeyEvent
from within your
JComponent
subclass. JComponent
automatically processes bindings from within its
processKeyEvent
method, hence you rarely need
to directly invoke this method.event
- KeyEvent used to identify which bindings to process, as
well as which Component has focus.public static boolean notifyAction(Action action, KeyStroke ks, KeyEvent event, Object sender, int modifiers)
actionPerformed
on action
if
action
is enabled (and non-null
). The command for the
ActionEvent is determined by:
registerKeyboardAction
, then the command string
passed in (null
will be used if null
was passed in).
null
.
getKeyChar
returns KeyEvent.CHAR_UNDEFINED..
action
is non-null
and
actionPerformed is invoked on it.public static void replaceUIInputMap(JComponent component, int type, InputMap uiInputMap)
component
to uiInputMap
. If uiInputMap
is null
,
this removes any previously installed UI InputMap.public static void replaceUIActionMap(JComponent component, ActionMap uiActionMap)
component
to uiActionMap
. If uiActionMap
is null
,
this removes any previously installed UI ActionMap.public static InputMap getUIInputMap(JComponent component, int condition)
condition
in component component
.
This will return null
if the UI has not installed a InputMap
of the specified type.
public static ActionMap getUIActionMap(JComponent component)
component
.
This will return null
if the UI has not installed an ActionMap.
public static Rectangle calculateInnerArea(JComponent c, Rectangle r)
r
and returns r
.
The position and size specify the bounds of the component,
adjusted so as not to include the border area (the insets).
This method is useful for classes
that implement painting code.c
- the JComponent in question; if null
, this method returns null
r
- the Rectangle instance to be modified;
may be null
null
if the Component is null
;
otherwise, returns the passed-in rectangle (if non-null
)
or a new rectangle specifying position and size informationpublic static Container getUnwrappedParent(Component component)
component
which is not an instance of JLayer
.component
- Component
to get
the first ancestor of, which is not a JLayer
instance.component
which is not an instance of JLayer
.
If such an ancestor can not be found, null
is returned.NullPointerException
- if component
is null
JLayer
public static Component getUnwrappedView(JViewport viewport)
JViewport
's descendant
which is not an instance of JLayer
.
If such a descendant can not be found, null
is returned.
If the viewport
's view component is not a JLayer
,
this method is equivalent to JViewport.getView()
otherwise JLayer.getView()
will be recursively
called on all descending JLayer
s.viewport
- JViewport
to get the first descendant of,
which in not a JLayer
instance.JViewport
's descendant
which is not an instance of JLayer
.
If such a descendant can not be found, null
is returned.NullPointerException
- if viewport
is null
JViewport.getView()
,
JLayer
Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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