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oracle.javatools.editor
Class BasicAction

java.lang.Object
javax.swing.AbstractAction
javax.swing.text.TextAction
oracle.javatools.editor.BasicAction

All Implemented Interfaces:

java.awt.event.ActionListener, java.io.Serializable, java.lang.Cloneable, java.util.EventListener, javax.swing.Action

Direct Known Subclasses:

BasicEditorKit.BeepAction, BasicEditorKit.GotoMatchingBraceAction, BasicEditorKit.NavigateAction, BasicEditorKit.NOPAction, BasicEditorKit.ReadOnlyAction, BasicEditorKit.RecenterLineAction, BasicEditorKit.ScrollLineDownAction, BasicEditorKit.ScrollLineUpAction, BasicEditorKit.ScrollPageDownAction, BasicEditorKit.ScrollPageUpAction, BasicEditorKit.SelectAllAction, BasicEditorKit.SelectLineAction, BasicEditorKit.SelectWordAction, BasicEditorKit.SetLocalTabSizeAction, BasicEditorKit.ToggleInsertModeAction, BasicEditorKit.UnselectAction, BasicEditorKit.WritableAction, BasicWriteAction, EmacsAction

public abstract class BasicAction

extends javax.swing.text.TextAction

The BasicAction is an abstract class that all editor actions should extend from. This provides some utility routines that can be used by subclasses. The primary purpose of this class is to track the last action executed within the editor. This is needed as certain actions (particularly Emacs ones) depend on this information.

See Also:

Serialized Form

Field Summary

Fields inherited from class javax.swing.AbstractAction

changeSupport, enabled

Fields inherited from interface javax.swing.Action

ACCELERATOR_KEY, ACTION_COMMAND_KEY, DEFAULT, DISPLAYED_MNEMONIC_INDEX_KEY, LARGE_ICON_KEY, LONG_DESCRIPTION, MNEMONIC_KEY, NAME, SELECTED_KEY, SHORT_DESCRIPTION, SMALL_ICON

Constructor Summary

BasicAction(java.lang.String actionName)
Constructs this object with the appropriate action name.

Method Summary

void	actionPerformed(java.awt.event.ActionEvent event) The operation to perform when this action is triggered.
abstract void	actionPerformed(java.awt.event.ActionEvent event, BasicEditorPane editor, BasicDocument document) The operation to perform when this action is triggered in a BasicEditorPane.
static void	beep(BasicEditorPane editor) Utility routine which just emits a beep.
static java.lang.String	buildIndent(boolean useTabs, int tabSize, int numColumns) Utility routine to build a String that can be used to indent a line by a certain size (not necessarily a single indent.) This is used for example if the document does use tab characters and the user indents the line - we may need to convert spaces to tabs to do the right thing.
static int	getFontHeight(BasicEditorPane editor) Utility routine which fetches the height of the current font of the editor.
static int	getIndentSizeProperty(BasicEditorPane editor) Utility routine to fetch the indent size for the given editor.
BasicAction	getLastAction(BasicEditorPane editor) Utility routine which retrieves the last action executed (prior to the current one.) If there was no previous action, null is returned.
static java.awt.Point	getMagicCaretPosition(BasicEditorPane editor) Reads the magic caret position from the editor's caret, or if there is none, the current horizontal position of the cursor.
protected java.lang.String	getName() Utility routine to return the name of this action instance.
static SmartIndentProvider	getSmartIndentProvider(BasicEditorPane editor, BasicDocument document) Fetch the SmartIndentProvider for the current document.
static java.lang.String	getSpaces(int numSpaces) Get a String with the specified number of space characters
static java.lang.String	getTab(boolean useTabs, int tabSize) Utility routine to fetch the tab or equivalent spaces to use.
static java.lang.String	getTabs(int numTabs) Get a String with the specified number of tab characters
static int	getTabSizeProperty(BasicEditorPane editor) Utility routine to fetch the tab stop size for the given editor.
static boolean	getUseAutoIndentProperty(BasicEditorPane editor) Utility routine to fetch whether auto-indentation should be done for the given editor.
static boolean	getUseTabsProperty(BasicEditorPane editor) Utility routine to fetch whether a tab character should be used for the given editor.
static java.awt.Rectangle	getVisibleRect(BasicEditorPane editor) Utility routine to fetch the current visible rectangle of the editor.
static boolean	isEditable(BasicEditorPane editor, boolean beepIfNotEditable) Utility routine which checks if the editor is editable, and beeps if it isn't (if requested.)
protected void	lock(BasicDocument document)
static void	setMagicCaretPosition(BasicEditorPane editor, java.awt.Point magicPosition) Stores the magic caret position into the editor's caret.
static void	showMessage(BasicEditorPane editor, java.lang.String message) Utility routine to show a feedback message in the editor.
static int	skipLeadingIndent(TextBuffer textBuffer, int lineStart, int lineEnd) Utility routine to find the offset of the first character after the leading indent (if any), or -1 for an empty line or line containing only whitespace.
protected void	unlock(BasicDocument document)

Methods inherited from class javax.swing.text.TextAction

augmentList, getFocusedComponent, getTextComponent

Methods inherited from class javax.swing.AbstractAction

addPropertyChangeListener, clone, firePropertyChange, getKeys, getPropertyChangeListeners, getValue, isEnabled, putValue, removePropertyChangeListener, setEnabled

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicAction

public BasicAction(java.lang.String actionName)

Constructs this object with the appropriate action name.

Method Detail

actionPerformed

public abstract void actionPerformed(java.awt.event.ActionEvent event,
                                     BasicEditorPane editor,
                                     BasicDocument document)

The operation to perform when this action is triggered in a BasicEditorPane. Implementations should override this method. Implementations are guaranteed that the document read lock is held for the duration of this call.

Parameters:

event - the action event

editor - the editor this action was invoked in

document - the document associated with the editor

actionPerformed

public void actionPerformed(java.awt.event.ActionEvent event)

The operation to perform when this action is triggered.

Parameters:

event - the action event

lock

protected void lock(BasicDocument document)

unlock

protected void unlock(BasicDocument document)

getName

protected final java.lang.String getName()

Utility routine to return the name of this action instance.

Returns:

the name of this action

getLastAction

public final BasicAction getLastAction(BasicEditorPane editor)

Utility routine which retrieves the last action executed (prior to the current one.) If there was no previous action, null is returned.

Parameters:

editor - the editor to check the last action executed

Returns:

the instance of the last action, or null if there was no last action

getMagicCaretPosition

public static java.awt.Point getMagicCaretPosition(BasicEditorPane editor)
                                            throws javax.swing.text.BadLocationException

Reads the magic caret position from the editor's caret, or if there is none, the current horizontal position of the cursor.

Parameters:

editor - the editor in which the vertical navigation occurred

Returns:

the magic caret position to use

Throws:

javax.swing.text.BadLocationException - this is generally unexpected, and may signal something more serious

setMagicCaretPosition

public static void setMagicCaretPosition(BasicEditorPane editor,
                                         java.awt.Point magicPosition)

Stores the magic caret position into the editor's caret. The magic postion is the point returned from getMagicCaretPosition().

Parameters:

editor - the editor in which the vertical navigation occurred

magicPosition - the new magic caret position

isEditable

public static boolean isEditable(BasicEditorPane editor,
                                 boolean beepIfNotEditable)

Utility routine which checks if the editor is editable, and beeps if it isn't (if requested.)

Parameters:

editor - the editor pane to check editability

beepIfNotEditable - request a beep if the editor is not editable

beep

public static void beep(BasicEditorPane editor)

Utility routine which just emits a beep. The editor pane has to be passed in because the getDefaultTookit() stuff is deprecated.

Parameters:

editor - the editor pane

getFontHeight

public static int getFontHeight(BasicEditorPane editor)

Utility routine which fetches the height of the current font of the editor.

Parameters:

editor - the editor pane

Returns:

the height of the editor font

getVisibleRect

public static java.awt.Rectangle getVisibleRect(BasicEditorPane editor)

Utility routine to fetch the current visible rectangle of the editor.

Parameters:

editor - the editor pane

Returns:

the visible rectangle for the editor

showMessage

public static void showMessage(BasicEditorPane editor,
                               java.lang.String message)

Utility routine to show a feedback message in the editor.

Parameters:

editor - the editor to show the message for

message - the message to display

getIndentSizeProperty

public static int getIndentSizeProperty(BasicEditorPane editor)

Utility routine to fetch the indent size for the given editor.

Parameters:

editor - the editor pane

Returns:

the indent size property for the editor

getTabSizeProperty

public static int getTabSizeProperty(BasicEditorPane editor)

Utility routine to fetch the tab stop size for the given editor.

Parameters:

editor - the editor pane

Returns:

the tab size property for the editor

getUseAutoIndentProperty

public static boolean getUseAutoIndentProperty(BasicEditorPane editor)

Utility routine to fetch whether auto-indentation should be done for the given editor.

Parameters:

editor - the editor pane

Returns:

whether to use auto-indentation for the editor

getSmartIndentProvider

public static SmartIndentProvider getSmartIndentProvider(BasicEditorPane editor,
                                                         BasicDocument document)

Fetch the SmartIndentProvider for the current document. If it is not available, or smart indentations are off, then return null.

Parameters:

editor - the editor pane

document - the document being edited

getUseTabsProperty

public static boolean getUseTabsProperty(BasicEditorPane editor)

Utility routine to fetch whether a tab character should be used for the given editor.

Parameters:

editor - the editor pane

Returns:

the use tabs property for the editor

getTab

public static java.lang.String getTab(boolean useTabs,
                                      int tabSize)

Utility routine to fetch the tab or equivalent spaces to use. This is just for convenience, i.e., to build a String with a certain number of spaces.

Parameters:

useTabs - whether to use a tab character

tabSize - the size of the tab stop (if using spaces)

Returns:

a String that can be used as the tab character

buildIndent

public static java.lang.String buildIndent(boolean useTabs,
                                           int tabSize,
                                           int numColumns)

Utility routine to build a String that can be used to indent a line by a certain size (not necessarily a single indent.) This is used for example if the document does use tab characters and the user indents the line - we may need to convert spaces to tabs to do the right thing.

Parameters:

useTabs - whether to use tab characters

tabSize - the size of a tab stop

numColumns - the width of the indent in number of columns

skipLeadingIndent

public static int skipLeadingIndent(TextBuffer textBuffer,
                                    int lineStart,
                                    int lineEnd)

Utility routine to find the offset of the first character after the leading indent (if any), or -1 for an empty line or line containing only whitespace.

Parameters:

textBuffer - the text buffer to use

lineStart - the start of the line

lineEnd - the end of the line

getSpaces

public static java.lang.String getSpaces(int numSpaces)

Get a String with the specified number of space characters

Parameters:

numSpaces - the number of space characters

Returns:

a String with the number of space characters requested

getTabs

public static java.lang.String getTabs(int numTabs)

Get a String with the specified number of tab characters

Parameters:

numTabs - the number of tab characters

Returns:

a String with the number of tab characters requested

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