com.codename1.ui.html

Class DefaultHTMLCallback

java.lang.Object

com.codename1.ui.html.DefaultHTMLCallback

All Implemented Interfaces:

HTMLCallback, ParserCallback

public class DefaultHTMLCallback
extends Object
implements HTMLCallback

This is a default implementation of HTMLCallback that basically doesn't do much but does keep the HTMLComponent work intact. This class was created so developers will avoid pitfalls of HTMLCallback, as using the wrong return values. Note that in any case an HTMLComponent doesn't have to use an HTMLCallback.

Field Summary

Fields

Modifier and Type	Field and Description
static int	ERROR_CSS_ATTIBUTE_VALUE_INVALID Error code denoting that an invalid attribute value was found in the CSS
static int	ERROR_CSS_ATTRIBUTE_NOT_SUPPORTED Error code denoting that an unsupported CSS attribute (by XHTML-MP 1.0 standards) was found in the HTML or external CSS files
static int	ERROR_CSS_NO_BASE_URL Error code denoting that a relative URL was referenced from a document with no base URL (A document that was loaded via setBody/setHTML/setDOM and not via setPage) In this case the return value of parsingError is not considered - parsing continues and the resource at the URL (CSS file/image) is ignored
static int	ERROR_CSS_NOT_FOUND Error code denoting that a CSS file referenced from the HTML or from another external CSS file was not found

Fields inherited from interface com.codename1.ui.html.HTMLCallback

ERROR_CONNECTING, ERROR_IMAGE_BAD_FORMAT, ERROR_IMAGE_NOT_FOUND, ERROR_INVALID_TAG_HIERARCHY, ERROR_NO_BASE_URL, FIELD_PASSWORD, FIELD_TEXT, LINK_FORBIDDEN, LINK_REGULAR, LINK_VISTED, STATUS_CANCELLED, STATUS_COMPLETED, STATUS_CONNECTED, STATUS_DISPLAYED, STATUS_ERROR, STATUS_NONE, STATUS_PARSED, STATUS_REDIRECTED, STATUS_REQUESTED

Fields inherited from interface com.codename1.xml.ParserCallback

ERROR_ATTIBUTE_VALUE_INVALID, ERROR_ATTRIBUTE_NOT_SUPPORTED, ERROR_ENCODING, ERROR_MULTIPLE_ROOTS, ERROR_NO_CLOSE_TAG, ERROR_NO_ROOTS, ERROR_TAG_NOT_SUPPORTED, ERROR_UNEXPECTED_CHARACTER, ERROR_UNEXPECTED_TAG_CLOSING, ERROR_UNRECOGNIZED_CHAR_ENTITY

Constructor Summary

Constructors

Constructor and Description
DefaultHTMLCallback()

Method Summary

Modifier and Type	Method and Description
void	actionPerformed(ActionEvent evt, HTMLComponent htmlC, HTMLElement element) {Called whenever an ActionEvent is triggered in one of the controls in the HTMLComponent For example, button press, checkbox/radiobutton check etc.}
void	dataChanged(int type, int index, HTMLComponent htmlC, TextField textField, HTMLElement element) {Called when the user types in a TextField inside the HTMLComponent This method will be called only if HTMLComponent.isEventsEnabled() is true}
String	fieldSubmitted(HTMLComponent htmlC, TextArea ta, String actionURL, String id, String value, int type, String errorMsg) {Called whenever a field is submitted to a form.}
void	focusGained(Component cmp, HTMLComponent htmlC, HTMLElement element) {Called when one of the controls in the HTMLComponent obtained focus This method will be called only if HTMLComponent.isEventsEnabled() is true}
void	focusLost(Component cmp, HTMLComponent htmlC, HTMLElement element) {Called when one of the controls in the HTMLComponent lost focus This method will be called only if HTMLComponent.isEventsEnabled() is true}
String	getAutoComplete(HTMLComponent htmlC, String actionURL, String id) {Called on form creation and enabled implementations of this method to return a value to preset in a form field.}
int	getLinkProperties(HTMLComponent htmlC, String url) {Returns properties about the given link to indicate to HTMLComponent how to render it Note that this method is always called NOT on the EDT thread.}
boolean	linkClicked(HTMLComponent htmlC, String url) {Called when a link is clicked.}
void	pageStatusChanged(HTMLComponent htmlC, int status, String url) {Called when the page status has been changed}
boolean	parsingError(int errorId, String tag, String attribute, String value, String description) {Called when encountering an error while parsing the XML document.}
void	selectionChanged(int oldSelected, int newSelected, HTMLComponent htmlC, List list, HTMLElement element) {Called when the user selects an item in a List inside the HTMLComponent Note: Selection is traversing through the items - once the user has actually decided, an ActionEvent will be sent as well This method will be called only if HTMLComponent.isEventsEnabled() is true}
void	titleUpdated(HTMLComponent htmlC, String title) {Called when the page's title is updated}

Methods inherited from class java.lang.Object

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

Field Detail

ERROR_CSS_ATTRIBUTE_NOT_SUPPORTED

public static final int ERROR_CSS_ATTRIBUTE_NOT_SUPPORTED

Error code denoting that an unsupported CSS attribute (by XHTML-MP 1.0 standards) was found in the HTML or external CSS files

See Also:

Constant Field Values

ERROR_CSS_ATTIBUTE_VALUE_INVALID

public static final int ERROR_CSS_ATTIBUTE_VALUE_INVALID

Error code denoting that an invalid attribute value was found in the CSS

See Also:

Constant Field Values

ERROR_CSS_NOT_FOUND

public static final int ERROR_CSS_NOT_FOUND

Error code denoting that a CSS file referenced from the HTML or from another external CSS file was not found

See Also:

Constant Field Values

ERROR_CSS_NO_BASE_URL

public static final int ERROR_CSS_NO_BASE_URL

Error code denoting that a relative URL was referenced from a document with no base URL (A document that was loaded via setBody/setHTML/setDOM and not via setPage) In this case the return value of parsingError is not considered - parsing continues and the resource at the URL (CSS file/image) is ignored

See Also:

Constant Field Values

Constructor Detail

DefaultHTMLCallback

public DefaultHTMLCallback()

Method Detail

titleUpdated

public void titleUpdated(HTMLComponent htmlC,
                         String title)

{Called when the page's title is updated}

Specified by:

titleUpdated in interface HTMLCallback

Parameters:

htmlC - The HTMLComponent that triggered the event

title - The new title

parsingError

public boolean parsingError(int errorId,
                            String tag,
                            String attribute,
                            String value,
                            String description)

{Called when encountering an error while parsing the XML document. When implementing this, the developer should return true if the error should be ignored and the document needs to be further parsed, or false to stop parsing and issue an error to the user Note that this method is always called NOT on the EDT thread.}

Specified by:

parsingError in interface ParserCallback

Parameters:

errorId - The error ID, one of the ERROR_* constants

tag - The tag in which the error occured (Can be null for non-tag related errors)

attribute - The attribute in which the error occured (Can be null for non-attribute related errors)

value - The value in which the error occured (Can be null for non-value related errors)

description - A verbal description of the error

Returns:

true to continue parsing, false to stop

pageStatusChanged

public void pageStatusChanged(HTMLComponent htmlC,
                              int status,
                              String url)

{Called when the page status has been changed}

Specified by:

pageStatusChanged in interface HTMLCallback

Parameters:

htmlC - The HTMLComponent in which the status change occured

status - The new status, one of the STATUS_* constants

url - The URL of the page

fieldSubmitted

public String fieldSubmitted(HTMLComponent htmlC,
                             TextArea ta,
                             String actionURL,
                             String id,
                             String value,
                             int type,
                             String errorMsg)

{Called whenever a field is submitted to a form. This can be used to perform sanity checks and/or to store values for auto complete.}

Specified by:

fieldSubmitted in interface HTMLCallback

Parameters:

htmlC - The HTMLComponent in which this event occured

ta - The TextArea/TextField of this field

actionURL - The action URL of the form

id - The ID of the field

value - The value entered

type - The type of the field, one of the FIELD_* constants

errorMsg - The error message if any error occured (i.e. input validation error) or null if no error occured

Returns:

The string to submit to the form (Should return value if nothing changed)

getAutoComplete

public String getAutoComplete(HTMLComponent htmlC,
                              String actionURL,
                              String id)

{Called on form creation and enabled implementations of this method to return a value to preset in a form field. This can be used to auto complete previously entered value Note that this method is always called NOT on the EDT thread.}

Specified by:

getAutoComplete in interface HTMLCallback

Parameters:

htmlC - The HTMLComponent in which this event occured

actionURL - The action URL of the form

id - The ID of the field

Returns:

The string to place in the indicated field

getLinkProperties

public int getLinkProperties(HTMLComponent htmlC,
                             String url)

{Returns properties about the given link to indicate to HTMLComponent how to render it Note that this method is always called NOT on the EDT thread.}

Specified by:

getLinkProperties in interface HTMLCallback

Parameters:

htmlC - The HTMLComponent

url - The Link URL

Returns:

LINK_REGULAR or LINK_VISITED or LINK_FORBIDDEN or a mask of those

linkClicked

public boolean linkClicked(HTMLComponent htmlC,
                           String url)

{Called when a link is clicked. This can be used to process links that needs additional/alternate handling than fetching an HTML.}

Specified by:

linkClicked in interface HTMLCallback

Parameters:

htmlC - The HTMLComponent

url - The Link URL

Returns:

true if regular link processing should continue, false otherwise

actionPerformed

public void actionPerformed(ActionEvent evt,
                            HTMLComponent htmlC,
                            HTMLElement element)

{Called whenever an ActionEvent is triggered in one of the controls in the HTMLComponent For example, button press, checkbox/radiobutton check etc. This method will be called only if HTMLComponent.isEventsEnabled() is true}

Specified by:

actionPerformed in interface HTMLCallback

Parameters:

evt - The event triggered, the component can be extracted using getSource

htmlC - The HTMLComponent

element - The element associated with the component that triggered the event

focusGained

public void focusGained(Component cmp,
                        HTMLComponent htmlC,
                        HTMLElement element)

{Called when one of the controls in the HTMLComponent obtained focus This method will be called only if HTMLComponent.isEventsEnabled() is true}

Specified by:

focusGained in interface HTMLCallback

Parameters:

cmp - The component that triggered the event

htmlC - The HTMLComponent

element - The element associated with the component that triggered the event

focusLost

public void focusLost(Component cmp,
                      HTMLComponent htmlC,
                      HTMLElement element)

{Called when one of the controls in the HTMLComponent lost focus This method will be called only if HTMLComponent.isEventsEnabled() is true}

Specified by:

focusLost in interface HTMLCallback

Parameters:

cmp - The component that triggered the event

htmlC - The HTMLComponent

element - The element associated with the component that triggered the event

selectionChanged

public void selectionChanged(int oldSelected,
                             int newSelected,
                             HTMLComponent htmlC,
                             List list,
                             HTMLElement element)

{Called when the user selects an item in a List inside the HTMLComponent Note: Selection is traversing through the items - once the user has actually decided, an ActionEvent will be sent as well This method will be called only if HTMLComponent.isEventsEnabled() is true}

Specified by:

selectionChanged in interface HTMLCallback

Parameters:

oldSelected - old selected index in list model

newSelected - new selected index in list model

htmlC - The HTMLComponent

list - The list that triggered the event (Usually a ComboBox but not always)

element - The element associated with the component that triggered the event (Should be TAG_SELECT)

dataChanged

public void dataChanged(int type,
                        int index,
                        HTMLComponent htmlC,
                        TextField textField,
                        HTMLElement element)

{Called when the user types in a TextField inside the HTMLComponent This method will be called only if HTMLComponent.isEventsEnabled() is true}

Specified by:

dataChanged in interface HTMLCallback

Parameters:

type - the type data change; REMOVED, ADDED or CHANGED

index - item index in a list model

htmlC - The HTMLComponent

textField - The TextField that triggerd the event

element - The element associated with the component that triggered the event (Should be TAG_INPUT with type text/password)