org.xwiki.gwt.wysiwyg.client.plugin.line
Class LinePlugin

java.lang.Object
  org.xwiki.gwt.wysiwyg.client.plugin.internal.AbstractPlugin
      org.xwiki.gwt.wysiwyg.client.plugin.line.LinePlugin

All Implemented Interfaces:

CommandListener, Plugin

Direct Known Subclasses:

IELinePlugin

public class LinePlugin
extends org.xwiki.gwt.wysiwyg.client.plugin.internal.AbstractPlugin
implements CommandListener

Overwrites the behavior of creating new lines of text and merging existing ones.

Version:

$Id: 01616bc2570384721ef263e2a2cbcbf5c957b360 $

Field Summary

static String	BR The name of the <br/> tag.
static String	CLASS_NAME The class name attribute.
protected DOMUtils	domUtils Collection of DOM utility methods.
static String	LI The name of the <li> tag.
static String	LINE_BREAK The CSS class name associated with BRs that are present in the rich text area's HTML input and which have to be kept even when they are placed at the end of a block-level element.
static Command	RESET The command that notifies us when the content of the rich text area has been reset.
static String	SPACER The CSS class name associated with BRs added at edit time to make items like empty block-level elements editable.
static Command	SUBMIT The command that stores the value of the rich text area in an HTML form field.
static String	TD The name of the <td> tag.
static String	TH The name of the <th> tag.

Constructor Summary

LinePlugin()

Method Summary

protected void	adjustLineBreak(com.google.gwt.dom.client.Node container, com.google.gwt.dom.client.Node br) Adjusts the line break position so that: Anchors don't start or end with a line break.
protected void	copyLineStyle(Element sourceLine, Element destinationLine) Copy some of the CSS styles from the source line to the destination line.
void	destroy()
protected void	ensureLineBreakIsVisible(com.google.gwt.dom.client.Node lineBreak, com.google.gwt.dom.client.Node container) Ensures that the line created by inserting a line break is visible.
protected void	handleRepeatableKey(Event event) Handles a repeatable key press.
void	init(RichTextArea textArea, Config config)
protected void	insertEmptyLine(com.google.gwt.dom.client.Node container, Range caret) Inserts an empty line before the block containing the caret.
protected void	insertLineBreak(com.google.gwt.dom.client.Node container, Range caret) Inserts a line break at the specified position in the document.
protected boolean	isAfterLineBreak(com.google.gwt.dom.client.Node container, Range caret)
protected boolean	isAtStart(com.google.gwt.dom.client.Node container, Range caret)
protected boolean	isEmptyLine(com.google.gwt.dom.client.Node node)
protected boolean	isLineBreak(com.google.gwt.dom.client.Node node)
protected void	markInitialLineBreaks() Marks the initial line breaks so they are not mistaken as SPACER.
protected void	markSpacers() Marks the BRs that have been added as spacers during the editing.
protected boolean	needsSpace(com.google.gwt.dom.client.Node leaf)
protected void	onBackspace(Event event) Overwrites the default rich text area behavior when the Backspace key is being pressed.
boolean	onBeforeCommand(CommandManager sender, Command command, String param)
void	onCommand(CommandManager sender, Command command, String param)
protected void	onEnter(Event event) Overwrites the default rich text area behavior when the Enter key is being pressed.
protected void	onEnterParagraph(com.google.gwt.dom.client.Node container, Range caret, Event event) Behaves as if the caret is inside a paragraph.
protected void	onReset() Called after the content of the rich text area has been reset.
protected void	replaceEmptyLinesWithParagraphs() Replaces <div class="wikimodel-emptyline"/> with <p/>.
protected void	splitLine(com.google.gwt.dom.client.Node container, Range caret) Splits a line after a line break.
protected void	unMarkSpacers()

Methods inherited from class org.xwiki.gwt.wysiwyg.client.plugin.internal.AbstractPlugin

getConfig, getTextArea, getUIExtensionList, getUIExtensions, saveRegistration, saveRegistrations

Methods inherited from class java.lang.Object

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

Field Detail

SUBMIT

public static final Command SUBMIT

The command that stores the value of the rich text area in an HTML form field.

RESET

public static final Command RESET

The command that notifies us when the content of the rich text area has been reset.

SPACER

public static final String SPACER

The CSS class name associated with BRs added at edit time to make items like empty block-level elements editable.

See Also:

Constant Field Values

LINE_BREAK

public static final String LINE_BREAK

The CSS class name associated with BRs that are present in the rich text area's HTML input and which have to be kept even when they are placed at the end of a block-level element. We need to mark this initial BRs so they are not mistaken with the SPACER BRs we add during the editing.

See Also:

Constant Field Values

CLASS_NAME

public static final String CLASS_NAME

The class name attribute.

See Also:

Constant Field Values

BR

public static final String BR

The name of the <br/> tag.

See Also:

Constant Field Values

LI

public static final String LI

The name of the <li> tag.

See Also:

Constant Field Values

TD

public static final String TD

The name of the <td> tag.

See Also:

Constant Field Values

TH

public static final String TH

The name of the <th> tag.

See Also:

Constant Field Values

domUtils

protected final DOMUtils domUtils

Collection of DOM utility methods.

Constructor Detail

LinePlugin

public LinePlugin()

Method Detail

init

public void init(RichTextArea textArea,
                 Config config)

Specified by:

init in interface Plugin

Overrides:

init in class org.xwiki.gwt.wysiwyg.client.plugin.internal.AbstractPlugin

destroy

public void destroy()

Specified by:

destroy in interface Plugin

Overrides:

destroy in class org.xwiki.gwt.wysiwyg.client.plugin.internal.AbstractPlugin

handleRepeatableKey

protected void handleRepeatableKey(Event event)

Handles a repeatable key press.

Parameters:

event - the native event that was fired

onBeforeCommand

public boolean onBeforeCommand(CommandManager sender,
                               Command command,
                               String param)

Specified by:

onBeforeCommand in interface CommandListener

See Also:

CommandListener.onBeforeCommand(CommandManager, Command, String)

onCommand

public void onCommand(CommandManager sender,
                      Command command,
                      String param)

Specified by:

onCommand in interface CommandListener

See Also:

CommandListener.onCommand(CommandManager, Command, String)

markSpacers

protected void markSpacers()

Marks the BRs that have been added as spacers during the editing. These BRs were added to overcome a Mozilla bug that prevents us from typing inside an empty block level element.

unMarkSpacers

protected void unMarkSpacers()

See Also:

markSpacers()

needsSpace

protected boolean needsSpace(com.google.gwt.dom.client.Node leaf)

Parameters:

leaf - a DOM node which has not children

Returns:

true if the given leaf needs space on the screen in order to be rendered, false otherwise

markInitialLineBreaks

protected void markInitialLineBreaks()

Marks the initial line breaks so they are not mistaken as SPACER.

replaceEmptyLinesWithParagraphs

protected void replaceEmptyLinesWithParagraphs()

Replaces <div class="wikimodel-emptyline"/> with <p/>. Empty lines are used by WikiModel to separate block level elements, but since the user should be able to write on these empty lines we convert them to paragraphs.

onEnter

protected void onEnter(Event event)

Overwrites the default rich text area behavior when the Enter key is being pressed.

Parameters:

event - the native event that was fired

onEnterParagraph

protected void onEnterParagraph(com.google.gwt.dom.client.Node container,
                                Range caret,
                                Event event)

Behaves as if the caret is inside a paragraph. Precisely:

• SHIFT+Enter generates a line break
• Enter at the beginning of the line inserts an empty line before
• Enter anywhere else splits the current block and generates a new paragraph.

Parameters:

container - a block-level element containing the caret

caret - the position of the caret inside the document

event - the native event that was fired

isAtStart

protected boolean isAtStart(com.google.gwt.dom.client.Node container,
                            Range caret)

Parameters:

container - a block level element containing the caret

caret - the position of the caret inside the document

Returns:

true if the caret is at the beginning of its block level container, false otherwise

isAfterLineBreak

protected boolean isAfterLineBreak(com.google.gwt.dom.client.Node container,
                                   Range caret)

Parameters:

container - a block level element containing the caret

caret - the position of the caret in the document

Returns:

true if the caret is immediately after a line break inside the given container, false otherwise

isLineBreak

protected boolean isLineBreak(com.google.gwt.dom.client.Node node)

Parameters:

node - a DOM node

Returns:

true if the given node marks a line break, false otherwise

adjustLineBreak

protected void adjustLineBreak(com.google.gwt.dom.client.Node container,
                               com.google.gwt.dom.client.Node br)

Adjusts the line break position so that:

• Anchors don't start or end with a line break.

Parameters:

container - the block-level element containing the line break

br - the line break

See Also:

When hitting Return at the end of the link the new line should not be a link

insertLineBreak

protected void insertLineBreak(com.google.gwt.dom.client.Node container,
                               Range caret)

Inserts a line break at the specified position in the document.

Parameters:

container - a block-level element containing the caret

caret - the place where to insert the line break

ensureLineBreakIsVisible

protected void ensureLineBreakIsVisible(com.google.gwt.dom.client.Node lineBreak,
                                        com.google.gwt.dom.client.Node container)

Ensures that the line created by inserting a line break is visible. This is need especially when the line break is inserted at the end of an existing line because most browsers don't allow the caret to be placed on invisible lines.

Parameters:

lineBreak - the line break that was inserted

container - the container (e.g. the paragraph) where the line break was inserted

splitLine

protected void splitLine(com.google.gwt.dom.client.Node container,
                         Range caret)

Splits a line after a line break.

Parameters:

container - a block-level element containing the caret

caret - the position of the caret in the document

insertEmptyLine

protected void insertEmptyLine(com.google.gwt.dom.client.Node container,
                               Range caret)

Inserts an empty line before the block containing the caret. This is useful when the caret is at the beginning of a block and we want to move that block down by one line; by pressing Enter we can do that.

Parameters:

container - a block-level element containing the caret

caret - the place where to insert the empty line

onBackspace

protected void onBackspace(Event event)

Overwrites the default rich text area behavior when the Backspace key is being pressed.

Parameters:

event - the native event that was fired

isEmptyLine

protected boolean isEmptyLine(com.google.gwt.dom.client.Node node)

Parameters:

node - a DOM node

Returns:

true if the given node represents an empty line

onReset

protected void onReset()

Called after the content of the rich text area has been reset.

copyLineStyle

protected void copyLineStyle(Element sourceLine,
                             Element destinationLine)

Copy some of the CSS styles from the source line to the destination line. Call this method to ensure the important line styles are preserved on the new line after splitting a line.

Parameters:

sourceLine - the line from where to copy the styles

destinationLine - the line whose style will be changed

See Also:

splitLine(Node, Range)