Module java.desktop

Package javax.swing.plaf.basic

Class BasicButtonUI

java.lang.Object

javax.swing.plaf.ComponentUI

javax.swing.plaf.ButtonUI

javax.swing.plaf.basic.BasicButtonUI

Direct Known Subclasses:

BasicToggleButtonUI, MetalButtonUI, SynthButtonUI

public class BasicButtonUI
extends ButtonUI

BasicButton implementation

Field Summary

Fields

Modifier and Type	Field	Description
protected int	defaultTextIconGap	The default gap between a text and an icon.
protected int	defaultTextShiftOffset	The default offset of a text.

Constructor Summary

Constructors

Constructor	Description
BasicButtonUI()

Method Summary

Modifier and Type	Method	Description
protected void	clearTextShiftOffset()	Clears the offset of the text.
protected BasicButtonListener	createButtonListener(AbstractButton b)	Returns a new instance of BasicButtonListener.
static ComponentUI	createUI(JComponent c)	Returns an instance of BasicButtonUI.
int	getBaseline(JComponent c, int width, int height)	Returns the baseline.
Component.BaselineResizeBehavior	getBaselineResizeBehavior(JComponent c)	Returns an enum indicating how the baseline of the component changes as the size changes.
int	getDefaultTextIconGap(AbstractButton b)	Returns the default gap between a text and an icon.
Dimension	getMaximumSize(JComponent c)	Returns the specified component's maximum size appropriate for the look and feel.
Dimension	getMinimumSize(JComponent c)	Returns the specified component's minimum size appropriate for the look and feel.
Dimension	getPreferredSize(JComponent c)	Returns the specified component's preferred size appropriate for the look and feel.
protected String	getPropertyPrefix()	Returns the property prefix.
protected int	getTextShiftOffset()	Returns the offset of the text.
protected void	installDefaults(AbstractButton b)	Installs default properties.
protected void	installKeyboardActions(AbstractButton b)	Registers keyboard actions.
protected void	installListeners(AbstractButton b)	Registers listeners.
void	installUI(JComponent c)	Configures the specified component appropriately for the look and feel.
void	paint(Graphics g, JComponent c)	Paints the specified component appropriately for the look and feel.
protected void	paintButtonPressed(Graphics g, AbstractButton b)	Paints a pressed button.
protected void	paintFocus(Graphics g, AbstractButton b, Rectangle viewRect, Rectangle textRect, Rectangle iconRect)	Paints a focused button.
protected void	paintIcon(Graphics g, JComponent c, Rectangle iconRect)	Paints an icon of the current button.
protected void	paintText(Graphics g, AbstractButton b, Rectangle textRect, String text)	Method which renders the text of the current button.
protected void	paintText(Graphics g, JComponent c, Rectangle textRect, String text)	Method which renders the text of the current button.
protected void	setTextShiftOffset()	Sets the offset of the text.
protected void	uninstallDefaults(AbstractButton b)	Uninstalls default properties.
protected void	uninstallKeyboardActions(AbstractButton b)	Unregisters keyboard actions.
protected void	uninstallListeners(AbstractButton b)	Unregisters listeners.
void	uninstallUI(JComponent c)	Reverses configuration which was done on the specified component during installUI.

Methods inherited from class javax.swing.plaf.ComponentUI

contains, getAccessibleChild, getAccessibleChildrenCount, update

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

defaultTextIconGap

protected int defaultTextIconGap

The default gap between a text and an icon.

defaultTextShiftOffset

protected int defaultTextShiftOffset

The default offset of a text.

Constructor Detail

BasicButtonUI

public BasicButtonUI()

Method Detail

createUI

public static ComponentUI createUI(JComponent c)

Returns an instance of BasicButtonUI.

Parameters:

c - a component

Returns:

an instance of BasicButtonUI

getPropertyPrefix

protected String getPropertyPrefix()

Returns the property prefix.

Returns:

the property prefix

installUI

public void installUI(JComponent c)

Description copied from class: ComponentUI

Configures the specified component appropriately for the look and feel. This method is invoked when the ComponentUI instance is being installed as the UI delegate on the specified component. This method should completely configure the component for the look and feel, including the following:

1. Install default property values for color, fonts, borders, icons, opacity, etc. on the component. Whenever possible, property values initialized by the client program should not be overridden.
2. Install a LayoutManager on the component if necessary.
3. Create/add any required sub-components to the component.
4. Create/install event listeners on the component.
5. Create/install a PropertyChangeListener on the component in order to detect and respond to component property changes appropriately.
6. Install keyboard UI (mnemonics, traversal, etc.) on the component.
7. Initialize any appropriate instance data.

Overrides:

installUI in class ComponentUI

Parameters:

c - the component where this UI delegate is being installed

See Also:

ComponentUI.uninstallUI(javax.swing.JComponent), JComponent.setUI(javax.swing.plaf.ComponentUI), JComponent.updateUI()

installDefaults

protected void installDefaults(AbstractButton b)

Installs default properties.

Parameters:

b - an abstract button

installListeners

protected void installListeners(AbstractButton b)

Registers listeners.

Parameters:

b - an abstract button

installKeyboardActions

protected void installKeyboardActions(AbstractButton b)

Registers keyboard actions.

Parameters:

b - an abstract button

uninstallUI

public void uninstallUI(JComponent c)

Description copied from class: ComponentUI

Reverses configuration which was done on the specified component during installUI. This method is invoked when this UIComponent instance is being removed as the UI delegate for the specified component. This method should undo the configuration performed in installUI, being careful to leave the JComponent instance in a clean state (no extraneous listeners, look-and-feel-specific property objects, etc.). This should include the following:

1. Remove any UI-set borders from the component.
2. Remove any UI-set layout managers on the component.
3. Remove any UI-added sub-components from the component.
4. Remove any UI-added event/property listeners from the component.
5. Remove any UI-installed keyboard UI from the component.
6. Nullify any allocated instance data objects to allow for GC.

Overrides:

uninstallUI in class ComponentUI

Parameters:

c - the component from which this UI delegate is being removed; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

See Also:

ComponentUI.installUI(javax.swing.JComponent), JComponent.updateUI()

uninstallKeyboardActions

protected void uninstallKeyboardActions(AbstractButton b)

Unregisters keyboard actions.

Parameters:

b - an abstract button

uninstallListeners

protected void uninstallListeners(AbstractButton b)

Unregisters listeners.

Parameters:

b - an abstract button

uninstallDefaults

protected void uninstallDefaults(AbstractButton b)

Uninstalls default properties.

Parameters:

b - an abstract button

createButtonListener

protected BasicButtonListener createButtonListener(AbstractButton b)

Returns a new instance of BasicButtonListener.

Parameters:

b - an abstract button

Returns:

a new instance of BasicButtonListener

getDefaultTextIconGap

public int getDefaultTextIconGap(AbstractButton b)

Returns the default gap between a text and an icon.

Parameters:

b - an abstract button

Returns:

the default gap between text and an icon

paint

public void paint(Graphics g,
                  JComponent c)

Description copied from class: ComponentUI

Paints the specified component appropriately for the look and feel. This method is invoked from the ComponentUI.update method when the specified component is being painted. Subclasses should override this method and use the specified Graphics object to render the content of the component.

Overrides:

paint in class ComponentUI

Parameters:

g - the Graphics context in which to paint

c - the component being painted; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

See Also:

ComponentUI.update(java.awt.Graphics, javax.swing.JComponent)

paintIcon

protected void paintIcon(Graphics g,
                         JComponent c,
                         Rectangle iconRect)

Paints an icon of the current button.

Parameters:

g - an instance of Graphics

c - a component

iconRect - a bounding rectangle to render the icon

paintText

protected void paintText(Graphics g,
                         JComponent c,
                         Rectangle textRect,
                         String text)

Method which renders the text of the current button. As of Java 2 platform v 1.4 this method should not be used or overriden. Use the paintText method which takes the AbstractButton argument.

Parameters:

g - an instance of Graphics

c - a component

textRect - a bounding rectangle to render the text

text - a string to render

paintText

protected void paintText(Graphics g,
                         AbstractButton b,
                         Rectangle textRect,
                         String text)

Method which renders the text of the current button.

Parameters:

g - Graphics context

b - Current button to render

textRect - Bounding rectangle to render the text

text - String to render

Since:

1.4

paintFocus

protected void paintFocus(Graphics g,
                          AbstractButton b,
                          Rectangle viewRect,
                          Rectangle textRect,
                          Rectangle iconRect)

Paints a focused button.

Parameters:

g - an instance of Graphics

b - an abstract button

viewRect - a bounding rectangle to render the button

textRect - a bounding rectangle to render the text

iconRect - a bounding rectangle to render the icon

paintButtonPressed

protected void paintButtonPressed(Graphics g,
                                  AbstractButton b)

Paints a pressed button.

Parameters:

g - an instance of Graphics

b - an abstract button

clearTextShiftOffset

protected void clearTextShiftOffset()

Clears the offset of the text.

setTextShiftOffset

protected void setTextShiftOffset()

Sets the offset of the text.

getTextShiftOffset

protected int getTextShiftOffset()

Returns the offset of the text.

Returns:

the offset of the text

getMinimumSize

public Dimension getMinimumSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's minimum size appropriate for the look and feel. If null is returned, the minimum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.

Overrides:

getMinimumSize in class ComponentUI

Parameters:

c - the component whose minimum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

Returns:

a Dimension object or null

See Also:

JComponent.getMinimumSize(), LayoutManager.minimumLayoutSize(java.awt.Container), ComponentUI.getPreferredSize(javax.swing.JComponent)

getPreferredSize

public Dimension getPreferredSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's preferred size appropriate for the look and feel. If null is returned, the preferred size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method returns null.

Overrides:

getPreferredSize in class ComponentUI

Parameters:

c - the component whose preferred size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

Returns:

a Dimension object containing given component's preferred size appropriate for the look and feel

See Also:

JComponent.getPreferredSize(), LayoutManager.preferredLayoutSize(java.awt.Container)

getMaximumSize

public Dimension getMaximumSize(JComponent c)

Description copied from class: ComponentUI

Returns the specified component's maximum size appropriate for the look and feel. If null is returned, the maximum size will be calculated by the component's layout manager instead (this is the preferred approach for any component with a specific layout manager installed). The default implementation of this method invokes getPreferredSize and returns that value.

Overrides:

getMaximumSize in class ComponentUI

Parameters:

c - the component whose maximum size is being queried; this argument is often ignored, but might be used if the UI object is stateless and shared by multiple components

Returns:

a Dimension object or null

See Also:

JComponent.getMaximumSize(), LayoutManager2.maximumLayoutSize(java.awt.Container)

getBaseline

public int getBaseline(JComponent c,
                       int width,
                       int height)

Returns the baseline.

Overrides:

getBaseline in class ComponentUI

Parameters:

c - JComponent baseline is being requested for

width - the width to get the baseline for

height - the height to get the baseline for

Returns:

baseline or a value < 0 indicating there is no reasonable baseline

Throws:

NullPointerException - if c is null

IllegalArgumentException - if width or height is < 0

Since:

1.6

See Also:

JComponent.getBaseline(int, int)

getBaselineResizeBehavior

public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c)

Returns an enum indicating how the baseline of the component changes as the size changes.

Overrides:

getBaselineResizeBehavior in class ComponentUI

Parameters:

c - JComponent to return baseline resize behavior for

Returns:

an enum indicating how the baseline changes as the component size changes

Throws:

NullPointerException - if c is null

Since:

1.6

See Also:

JComponent.getBaseline(int, int)