OpenJDK 27 · javax.swing.LookAndFeel · APIdia, the JavaDoc alternative

LookAndFeel, as the name implies, encapsulates a look and feel. Beyond installing a look and feel most developers never need to interact directly with LookAndFeel. In general only developers creating a custom look and feel need to concern themselves with this class.

Swing is built upon the foundation that each JComponent subclass has an implementation of a specific ComponentUI subclass. The ComponentUI is often referred to as "the ui", "component ui", or "look and feel delegate". The ComponentUI subclass is responsible for providing the look and feel specific functionality of the component. For example, JTree requires an implementation of the ComponentUI subclass TreeUI. The implementation of the specific ComponentUI subclass is provided by the LookAndFeel. Each JComponent subclass identifies the ComponentUI subclass it requires by way of the JComponent method getUIClassID.

Each LookAndFeel implementation must provide an implementation of the appropriate ComponentUI subclass by specifying a value for each of Swing's ui class ids in the UIDefaults object returned from getDefaults. For example, BasicLookAndFeel uses BasicTreeUI as the concrete implementation for TreeUI. This is accomplished by BasicLookAndFeel providing the key-value pair "TreeUI"-"javax.swing.plaf.basic.BasicTreeUI", in the UIDefaults returned from getDefaults. Refer to UIDefaults#getUI(JComponent) for details on how the implementation of the ComponentUI subclass is obtained.

When a LookAndFeel is installed the UIManager does not check that an entry exists for all ui class ids. As such, random exceptions will occur if the current look and feel has not provided a value for a particular ui class id and an instance of the JComponent subclass is created.

Recommendations for Look and Feels

As noted in UIManager each LookAndFeel has the opportunity to provide a set of defaults that are layered in with developer and system defaults. Some of Swing's components require the look and feel to provide a specific set of defaults. These are documented in the classes that require the specific default.

ComponentUIs and defaults

All ComponentUIs typically need to set various properties on the JComponent the ComponentUI is providing the look and feel for. This is typically done when the ComponentUI is installed on the JComponent. Setting a property should only be done if the developer has not set the property. For non-primitive values it is recommended that the ComponentUI only change the property on the JComponent if the current value is null or implements UIResource. If the current value is null or implements UIResource it indicates the property has not been set by the developer, and the ui is free to change it. For example, BasicButtonUI.installDefaults only changes the font on the JButton if the return value from button.getFont() is null or implements UIResource. On the other hand if button.getFont() returned a non-null value that did not implement UIResource then BasicButtonUI.installDefaults would not change the JButton's font.

For primitive values, such as opaque, the method installProperty should be invoked. installProperty only changes the corresponding property if the value has not been changed by the developer.

ComponentUI implementations should use the various install methods provided by this class as they handle the necessary checking and install the property using the recommended guidelines.

Exceptions

All of the install methods provided by LookAndFeel need to access the defaults if the value of the property being changed is null or a UIResource. For example, installing the font does the following:

  JComponent c;
  Font font = c.getFont();
  if (font == null || (font instanceof UIResource)) {
      c.setFont(UIManager.getFont("fontKey"));
  }

If the font is null or a UIResource, the defaults table is queried with the key fontKey. All of UIDefault's get methods throw a NullPointerException if passed in null. As such, unless otherwise noted each of the various install methods of LookAndFeel throw a NullPointerException if the current value is null or a UIResource and the supplied defaults key is null. In addition, unless otherwise specified all of the install methods throw a NullPointerException if a null component is passed in.

Access	Constructor and Description
protected	LookAndFeel() Constructor for subclasses to call.

Method Summary

Modifier and Type	Method and Description
public UIDefaults	Returns: the look and feel defaults getDefaults() Returns the look and feel defaults.
public abstract String	Returns: short description for the look and feel getDescription() Return a one line description of this look and feel implementation, e.g. "The CDE/Motif Look and Feel".
public static Object	Returns: the current value of the desktop property getDesktopPropertyValue(String the name of the system desktop property being queried systemPropertyName, Object the object to be returned as the value if the system value is null fallbackValue) Returns the value of the specified system desktop property by invoking `Toolkit.getDefaultToolkit().getDesktopProperty()`.
public Icon	Returns: disabled `Icon`, or `null` if a suitable `Icon` can not be generated getDisabledIcon(JComponent `JComponent` that will display the `Icon`, may be `null` component, Icon `Icon` to generate the disabled icon from icon) Returns an `Icon` with a disabled appearance.
public Icon	Returns: disabled and selected icon, or `null` if a suitable `Icon` can not be generated. getDisabledSelectedIcon(JComponent `JComponent` that will display the `Icon`, may be `null` component, Icon `Icon` to generate disabled and selected icon from icon) Returns an `Icon` for use by disabled components that are also selected.
public abstract String	Returns: identifier for the look and feel getID() Return a string that identifies this look and feel.
public LayoutStyle	Returns: the `LayoutStyle` for this look and feel getLayoutStyle() Returns the `LayoutStyle` for this look and feel.
public abstract String	Returns: short identifier for the look and feel getName() Return a short string that identifies this look and feel, e.g. "CDE/Motif".
public boolean	Returns: `true` if the `RootPaneUI` instances created by this look and feel support client side decorations getSupportsWindowDecorations() Returns `true` if the `LookAndFeel` returned `RootPaneUI` instances support providing `Window` decorations in a `JRootPane`.
public void	initialize() Initializes the look and feel.
public static void	installBorder(JComponent component to set the border on c, String key specifying the border defaultBorderName) Convenience method for setting a component's border property with a value from the defaults.
public static void	installColors(JComponent component to set the colors on c, String key for the background defaultBgName, String key for the foreground defaultFgName) Convenience method for setting a component's foreground and background color properties with values from the defaults.
public static void	installColorsAndFont(JComponent component set to the colors and font on c, String key for the background defaultBgName, String key for the foreground defaultFgName, String key for the font defaultFontName) Convenience method for setting a component's foreground, background and font properties with values from the defaults.
public static void	installProperty(JComponent target component to set the property on c, String name of the property to set propertyName, Object value of the property propertyValue) Convenience method for installing a property with the specified name and value on a component if that property has not already been set by the developer.
public abstract boolean	Returns: `true` if this look and feel represents the underlying platform look and feel isNativeLookAndFeel() If the underlying platform has a "native" look and feel, and this is an implementation of it, return `true`.
public abstract boolean	Returns: `true` if this is a supported look and feel isSupportedLookAndFeel() Return `true` if the underlying platform supports and or permits this look and feel.
public static void	loadKeyBindings(InputMap `InputMap` to add the `key-action` pairs to retMap, Object[] bindings to add to `retMap` keys) Populates an `InputMap` with the specified bindings.
public static ComponentInputMap	Returns: newly created and populated `InputMapUIResource` makeComponentInputMap(JComponent component to create the `ComponentInputMapUIResource` with c, Object[] alternating pairs of `keystroke-action key` pairs as described in `loadKeyBindings` keys) Creates a `ComponentInputMapUIResource` from `keys`.
public static Object	Returns: a `UIDefaults.LazyValue`; when resolved the `LazyValue` loads the specified image makeIcon(final Class<?> `Class` used to load the resource baseClass, final String path to the image to load gifFile) Creates and returns a `UIDefault.LazyValue` that loads an image.
public static InputMap	Returns: newly created and populated `InputMapUIResource` makeInputMap(Object[] alternating pairs of `keystroke-action key` pairs as described in `loadKeyBindings` keys) Creates an `InputMapUIResource` from `keys`.
public static JTextComponent.KeyBinding[]	Returns: an array of `KeyBindings` makeKeyBindings(Object[] an array of `key-action` pairs keyBindingList) Convenience method for building an array of `KeyBindings`.
public void	provideErrorFeedback(Component the `Component` the error occurred in, may be `null` indicating the error condition is not directly associated with a `Component` component) Invoked when the user attempts an invalid operation, such as pasting into an uneditable `JTextField` that has focus.
public String	Returns: a String representation of this object toString() Overrides java.lang.Object.toString. Returns a string that displays and identifies this object's properties.
public void	uninitialize() Uninitializes the look and feel.
public static void	uninstallBorder(JComponent component to uninstall the border on c) Convenience method for uninstalling a border.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

Constructor Detail

LookAndFeel	back to summary
protected LookAndFeel() Constructor for subclasses to call.

Method Detail

getDefaults back to summary

getDefaults	back to summary
public UIDefaults getDefaults() Returns the look and feel defaults. While this method is public, it should only be invoked by the `UIManager` when the look and feel is set as the current look and feel and after `initialize` has been invoked. Returns:UIDefaults the look and feel defaults See Also `initialize`, `uninitialize`, `UIManager#setLookAndFeel`

public UIDefaults getDefaults()

Returns the look and feel defaults. While this method is public, it should only be invoked by the UIManager when the look and feel is set as the current look and feel and after initialize has been invoked.

Returns:UIDefaults: the look and feel defaults
See Also: initialize, uninitialize, UIManager#setLookAndFeel

getDescription	back to summary
public abstract String getDescription() Return a one line description of this look and feel implementation, e.g. "The CDE/Motif Look and Feel". This string is intended for the user, e.g. in the title of a window or in a ToolTip message. Returns:String short description for the look and feel

getDescription

back to summary

public abstract String getDescription()

Return a one line description of this look and feel implementation, e.g. "The CDE/Motif Look and Feel". This string is intended for the user, e.g. in the title of a window or in a ToolTip message.

Returns:String: short description for the look and feel

getDesktopPropertyValue back to summary

getDesktopPropertyValue	back to summary
public static Object getDesktopPropertyValue(String systemPropertyName, Object fallbackValue) Returns the value of the specified system desktop property by invoking `Toolkit.getDefaultToolkit().getDesktopProperty()`. If the value of the specified property is `null`, `fallbackValue` is returned. Parameters systemPropertyName:String the name of the system desktop property being queried fallbackValue:Object the object to be returned as the value if the system value is null Returns:Object the current value of the desktop property Since 1.4 See Also `java.awt.Toolkit#getDesktopProperty`

public static Object getDesktopPropertyValue(String systemPropertyName, Object fallbackValue)

Returns the value of the specified system desktop property by invoking Toolkit.getDefaultToolkit().getDesktopProperty(). If the value of the specified property is null, fallbackValue is returned.

Parameters

systemPropertyName:String: the name of the system desktop property being queried
fallbackValue:Object: the object to be returned as the value if the system value is null

Returns:Object

the current value of the desktop property

Since

1.4

See Also

java.awt.Toolkit#getDesktopProperty

getDisabledIcon back to summary

getDisabledIcon	back to summary
public Icon getDisabledIcon(JComponent component, Icon icon) Returns an `Icon` with a disabled appearance. This method is used to generate a disabled `Icon` when one has not been specified. For example, if you create a `JButton` and only specify an `Icon` via `setIcon` this method will be called to generate the disabled `Icon`. If `null` is passed as `icon` this method returns `null`. Some look and feels might not render the disabled `Icon`, in which case they will ignore this. Parameters component:JComponent `JComponent` that will display the `Icon`, may be `null` icon:Icon `Icon` to generate the disabled icon from Returns:Icon disabled `Icon`, or `null` if a suitable `Icon` can not be generated Since 1.5

public Icon getDisabledIcon(JComponent component, Icon icon)

Returns an Icon with a disabled appearance. This method is used to generate a disabled Icon when one has not been specified. For example, if you create a JButton and only specify an Icon via setIcon this method will be called to generate the disabled Icon. If null is passed as icon this method returns null.

Some look and feels might not render the disabled Icon, in which case they will ignore this.

Parameters

component:JComponent: JComponent that will display the Icon, may be null
icon:Icon: Icon to generate the disabled icon from

Returns:Icon

disabled Icon, or null if a suitable Icon can not be generated

Since

1.5

getDisabledSelectedIcon back to summary

getDisabledSelectedIcon	back to summary
public Icon getDisabledSelectedIcon(JComponent component, Icon icon) Returns an `Icon` for use by disabled components that are also selected. This method is used to generate an `Icon` for components that are in both the disabled and selected states but do not have a specific `Icon` for this state. For example, if you create a `JButton` and only specify an `Icon` via `setIcon` this method will be called to generate the disabled and selected `Icon`. If `null` is passed as `icon` this methods returns `null`. Some look and feels might not render the disabled and selected `Icon`, in which case they will ignore this. Parameters component:JComponent `JComponent` that will display the `Icon`, may be `null` icon:Icon `Icon` to generate disabled and selected icon from Returns:Icon disabled and selected icon, or `null` if a suitable `Icon` can not be generated. Since 1.5

public Icon getDisabledSelectedIcon(JComponent component, Icon icon)

Returns an Icon for use by disabled components that are also selected. This method is used to generate an Icon for components that are in both the disabled and selected states but do not have a specific Icon for this state. For example, if you create a JButton and only specify an Icon via setIcon this method will be called to generate the disabled and selected Icon. If null is passed as icon this methods returns null.

Some look and feels might not render the disabled and selected Icon, in which case they will ignore this.

Parameters

component:JComponent: JComponent that will display the Icon, may be null
icon:Icon: Icon to generate disabled and selected icon from

Returns:Icon

disabled and selected icon, or null if a suitable Icon can not be generated.

Since

1.5

getID	back to summary
public abstract String getID() Return a string that identifies this look and feel. This string will be used by applications/services that want to recognize well known look and feel implementations. Presently the well known names are "Motif", "Windows", "Mac", "Metal". Note that a LookAndFeel derived from a well known superclass that doesn't make any fundamental changes to the look or feel shouldn't override this method. Returns:String identifier for the look and feel

getID

back to summary

public abstract String getID()

Return a string that identifies this look and feel. This string will be used by applications/services that want to recognize well known look and feel implementations. Presently the well known names are "Motif", "Windows", "Mac", "Metal". Note that a LookAndFeel derived from a well known superclass that doesn't make any fundamental changes to the look or feel shouldn't override this method.

Returns:String: identifier for the look and feel

getLayoutStyle back to summary

getLayoutStyle	back to summary
public LayoutStyle getLayoutStyle() Returns the `LayoutStyle` for this look and feel. This never returns `null`. You generally don't use the `LayoutStyle` from the look and feel, instead use the `LayoutStyle` method `getInstance`. Returns:LayoutStyle the `LayoutStyle` for this look and feel Since 1.6 See Also `LayoutStyle#getInstance`

public LayoutStyle getLayoutStyle()

Returns the LayoutStyle for this look and feel. This never returns null.

You generally don't use the LayoutStyle from the look and feel, instead use the LayoutStyle method getInstance.

Returns:LayoutStyle: the LayoutStyle for this look and feel
Since: 1.6
See Also: LayoutStyle#getInstance

getName	back to summary
public abstract String getName() Return a short string that identifies this look and feel, e.g. "CDE/Motif". This string should be appropriate for a menu item. Distinct look and feels should have different names, e.g. a subclass of MotifLookAndFeel that changes the way a few components are rendered should be called "CDE/Motif My Way"; something that would be useful to a user trying to select a L&F from a list of names. Returns:String short identifier for the look and feel

getName

back to summary

public abstract String getName()

Return a short string that identifies this look and feel, e.g. "CDE/Motif". This string should be appropriate for a menu item. Distinct look and feels should have different names, e.g. a subclass of MotifLookAndFeel that changes the way a few components are rendered should be called "CDE/Motif My Way"; something that would be useful to a user trying to select a L&F from a list of names.

Returns:String: short identifier for the look and feel

getSupportsWindowDecorations back to summary

getSupportsWindowDecorations	back to summary
public boolean getSupportsWindowDecorations() Returns `true` if the `LookAndFeel` returned `RootPaneUI` instances support providing `Window` decorations in a `JRootPane`. The default implementation returns `false`, subclasses that support `Window` decorations should override this and return `true`. Returns:boolean `true` if the `RootPaneUI` instances created by this look and feel support client side decorations Since 1.4 See Also `JDialog#setDefaultLookAndFeelDecorated`, `JFrame#setDefaultLookAndFeelDecorated`, `JRootPane#setWindowDecorationStyle`

public boolean getSupportsWindowDecorations()

Returns true if the LookAndFeel returned RootPaneUI instances support providing Window decorations in a JRootPane.

The default implementation returns false, subclasses that support Window decorations should override this and return true.

Returns:boolean: true if the RootPaneUI instances created by this look and feel support client side decorations
Since: 1.4
See Also: JDialog#setDefaultLookAndFeelDecorated, JFrame#setDefaultLookAndFeelDecorated, JRootPane#setWindowDecorationStyle

initialize back to summary

initialize	back to summary
public void initialize() Initializes the look and feel. While this method is public, it should only be invoked by the `UIManager` when a look and feel is installed as the current look and feel. This method is invoked before the `UIManager` invokes `getDefaults`. This method is intended to perform any initialization for the look and feel. Subclasses should do any one-time setup they need here, rather than in a static initializer, because look and feel class objects may be loaded just to discover that `isSupportedLookAndFeel()` returns `false`. See Also `uninitialize`, `UIManager#setLookAndFeel`

public void initialize()

Initializes the look and feel. While this method is public, it should only be invoked by the UIManager when a look and feel is installed as the current look and feel. This method is invoked before the UIManager invokes getDefaults. This method is intended to perform any initialization for the look and feel. Subclasses should do any one-time setup they need here, rather than in a static initializer, because look and feel class objects may be loaded just to discover that isSupportedLookAndFeel() returns false.

See Also: uninitialize, UIManager#setLookAndFeel

installBorder back to summary

installBorder	back to summary
public static void installBorder(JComponent c, String defaultBorderName) Convenience method for setting a component's border property with a value from the defaults. The border is only set if the border is `null` or an instance of `UIResource`. Parameters c:JComponent component to set the border on defaultBorderName:String key specifying the border Exceptions NullPointerException: as described in exceptions

public static void installBorder(JComponent c, String defaultBorderName)

Convenience method for setting a component's border property with a value from the defaults. The border is only set if the border is null or an instance of UIResource.

Parameters

c:JComponent: component to set the border on
defaultBorderName:String: key specifying the border

Exceptions

NullPointerException:: as described in exceptions

installColors back to summary

installColors	back to summary
public static void installColors(JComponent c, String defaultBgName, String defaultFgName) Convenience method for setting a component's foreground and background color properties with values from the defaults. The properties are only set if the current value is either `null` or a `UIResource`. Parameters c:JComponent component to set the colors on defaultBgName:String key for the background defaultFgName:String key for the foreground Exceptions NullPointerException: as described in exceptions See Also `installColorsAndFont`, `UIManager#getColor`

public static void installColors(JComponent c, String defaultBgName, String defaultFgName)

Convenience method for setting a component's foreground and background color properties with values from the defaults. The properties are only set if the current value is either null or a UIResource.

Parameters

c:JComponent: component to set the colors on
defaultBgName:String: key for the background
defaultFgName:String: key for the foreground

Exceptions

NullPointerException:: as described in exceptions

installColorsAndFont back to summary

installColorsAndFont	back to summary
public static void installColorsAndFont(JComponent c, String defaultBgName, String defaultFgName, String defaultFontName) Convenience method for setting a component's foreground, background and font properties with values from the defaults. The properties are only set if the current value is either `null` or a `UIResource`. Parameters c:JComponent component set to the colors and font on defaultBgName:String key for the background defaultFgName:String key for the foreground defaultFontName:String key for the font Exceptions NullPointerException: as described in exceptions See Also `installColors`, `UIManager#getColor`, `UIManager#getFont`

public static void installColorsAndFont(JComponent c, String defaultBgName, String defaultFgName, String defaultFontName)

Convenience method for setting a component's foreground, background and font properties with values from the defaults. The properties are only set if the current value is either null or a UIResource.

Parameters

c:JComponent: component set to the colors and font on
defaultBgName:String: key for the background
defaultFgName:String: key for the foreground
defaultFontName:String: key for the font

Exceptions

NullPointerException:: as described in exceptions

installProperty back to summary

installProperty	back to summary
public static void installProperty(JComponent c, String propertyName, Object propertyValue) Convenience method for installing a property with the specified name and value on a component if that property has not already been set by the developer. This method is intended to be used by ui delegate instances that need to specify a default value for a property of primitive type (boolean, int, ..), but do not wish to override a value set by the client. Since primitive property values cannot be wrapped with the `UIResource` marker, this method uses private state to determine whether the property has been set by the client. Parameters c:JComponent target component to set the property on propertyName:String name of the property to set propertyValue:Object value of the property Exceptions IllegalArgumentException: if the specified property is not one which can be set using this method ClassCastException: if the property value has not been set by the developer and the type does not match the property's type NullPointerException: if `c` is `null`, or the named property has not been set by the developer and `propertyValue` is `null` Since 1.5

public static void installProperty(JComponent c, String propertyName, Object propertyValue)

Convenience method for installing a property with the specified name and value on a component if that property has not already been set by the developer. This method is intended to be used by ui delegate instances that need to specify a default value for a property of primitive type (boolean, int, ..), but do not wish to override a value set by the client. Since primitive property values cannot be wrapped with the UIResource marker, this method uses private state to determine whether the property has been set by the client.

Parameters

c:JComponent: target component to set the property on
propertyName:String: name of the property to set
propertyValue:Object: value of the property

Exceptions

IllegalArgumentException:: if the specified property is not one which can be set using this method
ClassCastException:: if the property value has not been set by the developer and the type does not match the property's type
NullPointerException:: if c is null, or the named property has not been set by the developer and propertyValue is null

Since

1.5

isNativeLookAndFeel back to summary

isNativeLookAndFeel	back to summary
public abstract boolean isNativeLookAndFeel() If the underlying platform has a "native" look and feel, and this is an implementation of it, return `true`. For example, when the underlying platform is Solaris running CDE a CDE/Motif look and feel implementation would return `true`. Returns:boolean `true` if this look and feel represents the underlying platform look and feel

public abstract boolean isNativeLookAndFeel()

If the underlying platform has a "native" look and feel, and this is an implementation of it, return true. For example, when the underlying platform is Solaris running CDE a CDE/Motif look and feel implementation would return true.

Returns:boolean: true if this look and feel represents the underlying platform look and feel

isSupportedLookAndFeel back to summary

isSupportedLookAndFeel	back to summary
public abstract boolean isSupportedLookAndFeel() Return `true` if the underlying platform supports and or permits this look and feel. This method returns `false` if the look and feel depends on special resources or legal agreements that aren't defined for the current platform. Returns:boolean `true` if this is a supported look and feel See Also `UIManager#setLookAndFeel`

public abstract boolean isSupportedLookAndFeel()

Return true if the underlying platform supports and or permits this look and feel. This method returns false if the look and feel depends on special resources or legal agreements that aren't defined for the current platform.

Returns:boolean: true if this is a supported look and feel
See Also: UIManager#setLookAndFeel

loadKeyBindings back to summary

loadKeyBindings	back to summary
public static void loadKeyBindings(InputMap retMap, Object[] keys) Populates an `InputMap` with the specified bindings. The bindings are supplied as a list of alternating `keystroke-action key` pairs. The `keystroke` is either an instance of `KeyStroke`, or a `String` that identifies the `KeyStroke` for the binding. Refer to `KeyStroke.getKeyStroke(String)` for the specific format. The `action key` part of the pair is the key registered in the `InputMap` for the `KeyStroke`. The following illustrates loading an `InputMap` with two `key-action` pairs: LookAndFeel.loadKeyBindings(inputMap, new Object[] { "control X", "cut", "control V", "paste" }); Supplying a `null` list of bindings (`keys`) does not change `retMap` in any way. Specifying a `null` `action key` results in removing the `keystroke's` entry from the `InputMap`. A `null` `keystroke` is ignored. Parameters retMap:InputMap `InputMap` to add the `key-action` pairs to keys:Object[] bindings to add to `retMap` Exceptions NullPointerException: if `keys` is `non-null`, not empty, and `retMap` is `null` Since 1.3 See Also `KeyStroke#getKeyStroke(String)`, `InputMap`

public static void loadKeyBindings(InputMap retMap, Object[] keys)

Populates an InputMap with the specified bindings. The bindings are supplied as a list of alternating keystroke-action key pairs. The keystroke is either an instance of KeyStroke, or a String that identifies the KeyStroke for the binding. Refer to KeyStroke.getKeyStroke(String) for the specific format. The action key part of the pair is the key registered in the InputMap for the KeyStroke.

The following illustrates loading an InputMap with two key-action pairs:

  LookAndFeel.loadKeyBindings(inputMap, new Object[] {
    "control X", "cut",
    "control V", "paste"
  });

Supplying a null list of bindings (keys) does not change retMap in any way.

Specifying a null action key results in removing the keystroke's entry from the InputMap. A null keystroke is ignored.

Parameters

retMap:InputMap: InputMap to add the key-action pairs to
keys:Object[]: bindings to add to retMap

Exceptions

NullPointerException:: if keys is non-null, not empty, and retMap is null

Since

1.3

makeComponentInputMap back to summary

makeComponentInputMap	back to summary
public static ComponentInputMap makeComponentInputMap(JComponent c, Object[] keys) Creates a `ComponentInputMapUIResource` from `keys`. This is a convenience method for creating a new `ComponentInputMapUIResource`, invoking `loadKeyBindings(map, keys)`, and returning the `ComponentInputMapUIResource`. Parameters c:JComponent component to create the `ComponentInputMapUIResource` with keys:Object[] alternating pairs of `keystroke-action key` pairs as described in `loadKeyBindings` Returns:ComponentInputMap newly created and populated `InputMapUIResource` Exceptions IllegalArgumentException: if `c` is `null` Since 1.3 See Also `loadKeyBindings`, `ComponentInputMapUIResource`

public static ComponentInputMap makeComponentInputMap(JComponent c, Object[] keys)

Creates a ComponentInputMapUIResource from keys. This is a convenience method for creating a new ComponentInputMapUIResource, invoking loadKeyBindings(map, keys), and returning the ComponentInputMapUIResource.

Parameters

c:JComponent: component to create the ComponentInputMapUIResource with
keys:Object[]: alternating pairs of keystroke-action key pairs as described in loadKeyBindings

Returns:ComponentInputMap

newly created and populated InputMapUIResource

Exceptions

IllegalArgumentException:: if c is null

Since

1.3

makeIcon back to summary

makeIcon	back to summary
public static Object makeIcon(final Class<?> baseClass, final String gifFile) Creates and returns a `UIDefault.LazyValue` that loads an image. The returned value is an implementation of `UIDefaults.LazyValue`. When `createValue` is invoked on the returned object, the image is loaded. If the image is `non-null`, it is then wrapped in an `Icon` that implements `UIResource`. The image is loaded using `Class.getResourceAsStream(gifFile)`. This method does not check the arguments in any way. It is strongly recommended that `non-null` values are supplied else exceptions may occur when `createValue` is invoked on the returned object. Parameters baseClass:Class<?> `Class` used to load the resource gifFile:String path to the image to load Returns:Object a `UIDefaults.LazyValue`; when resolved the `LazyValue` loads the specified image See Also `UIDefaults.LazyValue`, `Icon`, `Class#getResourceAsStream(String)`

public static Object makeIcon(final Class<?> baseClass, final String gifFile)

Creates and returns a UIDefault.LazyValue that loads an image. The returned value is an implementation of UIDefaults.LazyValue. When createValue is invoked on the returned object, the image is loaded. If the image is non-null, it is then wrapped in an Icon that implements UIResource. The image is loaded using Class.getResourceAsStream(gifFile).

This method does not check the arguments in any way. It is strongly recommended that non-null values are supplied else exceptions may occur when createValue is invoked on the returned object.

Parameters

baseClass:Class<?>: Class used to load the resource
gifFile:String: path to the image to load

Returns:Object

a UIDefaults.LazyValue; when resolved the LazyValue loads the specified image

makeInputMap back to summary

makeInputMap	back to summary
public static InputMap makeInputMap(Object[] keys) Creates an `InputMapUIResource` from `keys`. This is a convenience method for creating a new `InputMapUIResource`, invoking `loadKeyBindings(map, keys)`, and returning the `InputMapUIResource`. Parameters keys:Object[] alternating pairs of `keystroke-action key` pairs as described in `loadKeyBindings` Returns:InputMap newly created and populated `InputMapUIResource` Since 1.3 See Also `loadKeyBindings`

public static InputMap makeInputMap(Object[] keys)

Creates an InputMapUIResource from keys. This is a convenience method for creating a new InputMapUIResource, invoking loadKeyBindings(map, keys), and returning the InputMapUIResource.

Parameters

keys:Object[]: alternating pairs of keystroke-action key pairs as described in loadKeyBindings

Returns:InputMap

newly created and populated InputMapUIResource

Since

1.3

See Also

loadKeyBindings

makeKeyBindings back to summary

makeKeyBindings	back to summary
public static JTextComponent.KeyBinding[] makeKeyBindings(Object[] keyBindingList) Convenience method for building an array of `KeyBindings`. While this method is not deprecated, developers should instead use `ActionMap` and `InputMap` for supplying key bindings. This method returns an array of `KeyBindings`, one for each alternating `key-action` pair in `keyBindingList`. A `key` can either be a `String` in the format specified by the `KeyStroke.getKeyStroke` method, or a `KeyStroke`. The `action` part of the pair is a `String` that corresponds to the name of the `Action`. The following example illustrates creating a `KeyBinding` array from six alternating `key-action` pairs: JTextComponent.KeyBinding[] multilineBindings = makeKeyBindings( new Object[] { "UP", DefaultEditorKit.upAction, "DOWN", DefaultEditorKit.downAction, "PAGE_UP", DefaultEditorKit.pageUpAction, "PAGE_DOWN", DefaultEditorKit.pageDownAction, "ENTER", DefaultEditorKit.insertBreakAction, "TAB", DefaultEditorKit.insertTabAction }); If `keyBindingList's` length is odd, the last element is ignored. Supplying a `null` value for either the `key` or `action` part of the `key-action` pair results in creating a `KeyBinding` with the corresponding value `null`. As other parts of Swing's expect `non-null` values in a `KeyBinding`, you should avoid supplying `null` as either the `key` or `action` part of the `key-action` pair. Parameters keyBindingList:Object[] an array of `key-action` pairs Returns:JTextComponent.KeyBinding[] an array of `KeyBindings` Exceptions NullPointerException: if `keyBindingList` is `null` ClassCastException: if the `key` part of the pair is not a `KeyStroke` or `String`, or the `action` part of the pair is not a `String` See Also `ActionMap`, `InputMap`, `KeyStroke#getKeyStroke`

public static JTextComponent.KeyBinding[] makeKeyBindings(Object[] keyBindingList)

Convenience method for building an array of KeyBindings. While this method is not deprecated, developers should instead use ActionMap and InputMap for supplying key bindings.

This method returns an array of KeyBindings, one for each alternating key-action pair in keyBindingList. A key can either be a String in the format specified by the KeyStroke.getKeyStroke method, or a KeyStroke. The action part of the pair is a String that corresponds to the name of the Action.

The following example illustrates creating a KeyBinding array from six alternating key-action pairs:

 JTextComponent.KeyBinding[] multilineBindings = makeKeyBindings( new Object[] {
         "UP", DefaultEditorKit.upAction,
       "DOWN", DefaultEditorKit.downAction,
    "PAGE_UP", DefaultEditorKit.pageUpAction,
  "PAGE_DOWN", DefaultEditorKit.pageDownAction,
      "ENTER", DefaultEditorKit.insertBreakAction,
        "TAB", DefaultEditorKit.insertTabAction
 });

If keyBindingList's length is odd, the last element is ignored.

Supplying a null value for either the key or action part of the key-action pair results in creating a KeyBinding with the corresponding value null. As other parts of Swing's expect non-null values in a KeyBinding, you should avoid supplying null as either the key or action part of the key-action pair.

Parameters

keyBindingList:Object[]: an array of key-action pairs

Returns:JTextComponent.KeyBinding[]

an array of KeyBindings

Exceptions

NullPointerException:: if keyBindingList is null
ClassCastException:: if the key part of the pair is not a KeyStroke or String, or the action part of the pair is not a String

provideErrorFeedback back to summary

provideErrorFeedback	back to summary
public void provideErrorFeedback(Component component) Invoked when the user attempts an invalid operation, such as pasting into an uneditable `JTextField` that has focus. The default implementation beeps. Subclasses that wish different behavior should override this and provide the additional feedback. Parameters component:Component the `Component` the error occurred in, may be `null` indicating the error condition is not directly associated with a `Component` Since 1.4

public void provideErrorFeedback(Component component)

Invoked when the user attempts an invalid operation, such as pasting into an uneditable JTextField that has focus. The default implementation beeps. Subclasses that wish different behavior should override this and provide the additional feedback.

Parameters

component:Component: the Component the error occurred in, may be null indicating the error condition is not directly associated with a Component

Since

1.4

toString	back to summary
public String toString() Overrides java.lang.Object.toString. Returns a string that displays and identifies this object's properties. Returns:String a String representation of this object

toString

back to summary

public String toString()

Overrides java.lang.Object.toString.

Returns a string that displays and identifies this object's properties.

Returns:String: a String representation of this object

uninitialize back to summary

uninitialize	back to summary
public void uninitialize() Uninitializes the look and feel. While this method is public, it should only be invoked by the `UIManager` when the look and feel is uninstalled. For example, `UIManager.setLookAndFeel` invokes this when the look and feel is changed. Subclasses may choose to free up some resources here. See Also `initialize`, `UIManager#setLookAndFeel`

public void uninitialize()

Uninitializes the look and feel. While this method is public, it should only be invoked by the UIManager when the look and feel is uninstalled. For example, UIManager.setLookAndFeel invokes this when the look and feel is changed.

Subclasses may choose to free up some resources here.

See Also: initialize, UIManager#setLookAndFeel

uninstallBorder back to summary

uninstallBorder	back to summary
public static void uninstallBorder(JComponent c) Convenience method for uninstalling a border. If the border of the component is a `UIResource`, it is set to `null`. Parameters c:JComponent component to uninstall the border on Exceptions NullPointerException: if `c` is `null`

public static void uninstallBorder(JComponent c)

Convenience method for uninstalling a border. If the border of the component is a UIResource, it is set to null.

Parameters

c:JComponent: component to uninstall the border on

Exceptions

NullPointerException:: if c is null

public abstract Class LookAndFeel

Recommendations for Look and Feels

ComponentUIs and defaults

Exceptions

Constructor Summary

Method Summary

Constructor Detail

Method Detail