com.vaadin.terminal.gwt.client
Class Util

java.lang.Object
  com.vaadin.terminal.gwt.client.Util

public class Util
extends Object

Constructor Summary

Util()

Method Summary

static void	addPngFix(com.google.gwt.user.client.Element el) Adds transparent PNG fix to image element; only use for IE6.
static void	alert(String string)
static void	browserDebugger() Helper method for debugging purposes.
static com.google.gwt.user.client.Element	cloneNode(com.google.gwt.user.client.Element element, boolean deep) Clones given element as in JavaScript.
static void	componentSizeUpdated(Set<Paintable> paintables) Called when the size of one or more widgets have changed during rendering.
static void	detachAttach(com.google.gwt.user.client.Element element) Detaches and re-attaches the element from its parent.
static void	doIE6PngFix(com.google.gwt.user.client.Element el)
static boolean	equals(Object a, Object b)
static String	escapeAttribute(String attribute) Escapes the string so it is safe to write inside an HTML attribute.
static String	escapeHTML(String html) Converts html entities to text.
static <T> T	findWidget(com.google.gwt.user.client.Element element, Class<? extends com.google.gwt.user.client.ui.Widget> class1) Helper method to find first instance of given Widget type found by traversing DOM upwards from given element.
static void	focus(com.google.gwt.user.client.Element el) Will (attempt) to focus the given DOM Element.
static void	forceWebkitRedraw(com.google.gwt.user.client.Element element) Force webkit to redraw an element
static int	getChildElementIndex(com.google.gwt.user.client.Element childElement) Returns the index of the childElement within its parent.
static Paintable	getChildPaintableForElement(ApplicationConnection client, Container parent, com.google.gwt.user.client.Element element) Locates the child component of parent which contains the element element.
static com.google.gwt.user.client.Element	getElementFromPoint(int clientX, int clientY) Returns the topmost element of from given coordinates.
static com.google.gwt.user.client.Element	getElementUnderMouse(com.google.gwt.dom.client.NativeEvent event) Find the element corresponding to the coordinates in the passed mouse event.
static com.google.gwt.user.client.Element	getIEFocusedElement() Gets the currently focused element for Internet Explorer.
static Container	getLayout(com.google.gwt.user.client.ui.Widget component) Returns closest parent Widget in hierarchy that implements Container interface
static int	getNativeScrollbarSize()
static Paintable	getPaintableForElement(ApplicationConnection client, com.google.gwt.user.client.ui.Widget parent, com.google.gwt.user.client.Element element) Locates the nested child component of parent which contains the element element.
static int	getRequiredHeight(com.google.gwt.dom.client.Element element)
static int	getRequiredHeight(com.google.gwt.user.client.ui.Widget widget)
static int	getRequiredWidth(com.google.gwt.dom.client.Element element)
static int	getRequiredWidth(com.google.gwt.user.client.ui.Widget widget)
static String	getSimpleName(Object widget)
static int	getTouchOrMouseClientX(com.google.gwt.user.client.Event event) A helper method to return the client position from an event.
static int	getTouchOrMouseClientX(com.google.gwt.dom.client.NativeEvent event)
static int	getTouchOrMouseClientY(com.google.gwt.user.client.Event event) A helper method to return the client position from an event.
static int	getTouchOrMouseClientY(com.google.gwt.dom.client.NativeEvent currentGwtEvent)
static boolean	isAttachedAndDisplayed(com.google.gwt.user.client.ui.Widget widget) Kind of stronger version of isAttached().
static boolean	isCached(UIDL uidl)
static boolean	isFF2() Deprecated. use BrowserInfo class instead
static boolean	isIE() Deprecated. use BrowserInfo class instead
static boolean	isIE6() Deprecated. use BrowserInfo class instead
static boolean	isIE7() Deprecated. use BrowserInfo class instead
static boolean	isTouchEvent(com.google.gwt.user.client.Event event)
static boolean	isTouchEvent(com.google.gwt.dom.client.NativeEvent event)
static boolean	isTouchEventOrLeftMouseButton(com.google.gwt.user.client.Event event) Checks if the given event is either a touch event or caused by the left mouse button
static boolean	mayHaveScrollBars(com.google.gwt.dom.client.Element pe) Detects what is currently the overflow style attribute in given element.
static int	measureHorizontalBorder(com.google.gwt.user.client.Element element)
static int	measureHorizontalPaddingAndBorder(com.google.gwt.user.client.Element element, int paddingGuess)
static int	measureMarginLeft(com.google.gwt.user.client.Element element)
static int	measureVerticalBorder(com.google.gwt.user.client.Element element)
static int	measureVerticalPaddingAndBorder(com.google.gwt.user.client.Element element, int paddingGuess)
static void	notifyParentOfSizeChange(Paintable widget, boolean lazy) This helper method can be called if components size have been changed outside rendering phase.
static float	parseRelativeSize(String size)
static RenderInformation.FloatSize	parseRelativeSize(UIDL uidl) Parses the UIDL parameter and fetches the relative size of the component.
static void	runIE7ZeroSizedBodyFix() IE7 sometimes "forgets" to render content.
static void	runWebkitOverflowAutoFix(com.google.gwt.user.client.Element elem) Run workaround for webkits overflow auto issue.
static void	scrollIntoViewVertically(com.google.gwt.user.client.Element elem) Scrolls an element into view vertically only.
static void	setFloat(com.google.gwt.user.client.Element element, String value)
static int	setHeightExcludingPaddingAndBorder(com.google.gwt.user.client.Element element, int requestedHeight, int verticalPaddingBorderGuess, boolean requestedHeightIncludesPaddingBorder)
static int	setHeightExcludingPaddingAndBorder(com.google.gwt.user.client.ui.Widget widget, String height, int paddingBorderGuess)
static void	setIEFocusedElement(com.google.gwt.user.client.Element elem) Gets the currently focused element for Internet Explorer.
static void	setStyleTemporarily(com.google.gwt.user.client.Element element, String styleProperty, String tempValue) Temporarily sets the styleProperty to tempValue and then resets it to its current value.
static int	setWidthExcludingPaddingAndBorder(com.google.gwt.user.client.Element element, int requestedWidth, int horizontalPaddingBorderGuess, boolean requestedWidthIncludesPaddingBorder)
static int	setWidthExcludingPaddingAndBorder(com.google.gwt.user.client.ui.Widget widget, String width, int paddingBorderGuess)
static void	shakeBodyElement() Does some very small adjustments to body element.
static void	simulateClickFromTouchEvent(com.google.gwt.user.client.Event touchevent, com.google.gwt.user.client.ui.Widget widget)
static void	sinkOnloadForImages(com.google.gwt.user.client.Element element)
static void	updateRelativeChildrenAndSendSizeUpdateEvent(ApplicationConnection client, com.google.gwt.user.client.ui.HasWidgets container)
static void	updateRelativeChildrenAndSendSizeUpdateEvent(ApplicationConnection client, com.google.gwt.user.client.ui.HasWidgets container, Paintable widget)

Methods inherited from class java.lang.Object

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

Constructor Detail

Util

public Util()

Method Detail

browserDebugger

public static void browserDebugger()

Helper method for debugging purposes. Stops execution on firefox browsers on a breakpoint.

getElementFromPoint

public static com.google.gwt.user.client.Element getElementFromPoint(int clientX,
                                                                     int clientY)

Returns the topmost element of from given coordinates. TODO fix crossplat issues clientX vs pageX. See quircksmode. Not critical for vaadin as we scroll div istead of page.

Parameters:

x -

y -

Returns:

the element at given coordinates

notifyParentOfSizeChange

public static void notifyParentOfSizeChange(Paintable widget,
                                            boolean lazy)

This helper method can be called if components size have been changed outside rendering phase. It notifies components parent about the size change so it can react. When using this method, developer should consider if size changes could be notified lazily. If lazy flag is true, method will save widget and wait for a moment until it notifies parents in chunks. This may vastly optimize layout in various situation. Example: if component have a lot of images their onload events may fire "layout phase" many times in a short period.

Parameters:

widget -

lazy - run componentSizeUpdated lazyly

componentSizeUpdated

public static void componentSizeUpdated(Set<Paintable> paintables)

Called when the size of one or more widgets have changed during rendering. Finds parent container and notifies them of the size change.

Parameters:

paintables -

parseRelativeSize

public static float parseRelativeSize(String size)

getLayout

public static Container getLayout(com.google.gwt.user.client.ui.Widget component)

Returns closest parent Widget in hierarchy that implements Container interface

Parameters:

component -

Returns:

closest parent Container

isIE

@Deprecated
public static boolean isIE()

Deprecated. use BrowserInfo class instead

Detects if current browser is IE.

Returns:

true if IE

isIE6

@Deprecated
public static boolean isIE6()

Deprecated. use BrowserInfo class instead

Detects if current browser is IE6.

Returns:

true if IE6

isIE7

@Deprecated
public static boolean isIE7()

Deprecated. use BrowserInfo class instead

Returns:

isFF2

@Deprecated
public static boolean isFF2()

Deprecated. use BrowserInfo class instead

Returns:

escapeHTML

public static String escapeHTML(String html)

Converts html entities to text.

Parameters:

html -

Returns:

escaped string presentation of given html

escapeAttribute

public static String escapeAttribute(String attribute)

Escapes the string so it is safe to write inside an HTML attribute.

Parameters:

attribute - The string to escape

Returns:

An escaped version of attribute.

addPngFix

public static void addPngFix(com.google.gwt.user.client.Element el)

Adds transparent PNG fix to image element; only use for IE6.

Parameters:

el - IMG element

doIE6PngFix

public static void doIE6PngFix(com.google.gwt.user.client.Element el)

cloneNode

public static com.google.gwt.user.client.Element cloneNode(com.google.gwt.user.client.Element element,
                                                           boolean deep)

Clones given element as in JavaScript. Deprecate this if there appears similar method into GWT someday.

Parameters:

element -

deep - clone child tree also

Returns:

measureHorizontalPaddingAndBorder

public static int measureHorizontalPaddingAndBorder(com.google.gwt.user.client.Element element,
                                                    int paddingGuess)

measureVerticalPaddingAndBorder

public static int measureVerticalPaddingAndBorder(com.google.gwt.user.client.Element element,
                                                  int paddingGuess)

measureHorizontalBorder

public static int measureHorizontalBorder(com.google.gwt.user.client.Element element)

measureVerticalBorder

public static int measureVerticalBorder(com.google.gwt.user.client.Element element)

measureMarginLeft

public static int measureMarginLeft(com.google.gwt.user.client.Element element)

setHeightExcludingPaddingAndBorder

public static int setHeightExcludingPaddingAndBorder(com.google.gwt.user.client.ui.Widget widget,
                                                     String height,
                                                     int paddingBorderGuess)

setWidthExcludingPaddingAndBorder

public static int setWidthExcludingPaddingAndBorder(com.google.gwt.user.client.ui.Widget widget,
                                                    String width,
                                                    int paddingBorderGuess)

setWidthExcludingPaddingAndBorder

public static int setWidthExcludingPaddingAndBorder(com.google.gwt.user.client.Element element,
                                                    int requestedWidth,
                                                    int horizontalPaddingBorderGuess,
                                                    boolean requestedWidthIncludesPaddingBorder)

setHeightExcludingPaddingAndBorder

public static int setHeightExcludingPaddingAndBorder(com.google.gwt.user.client.Element element,
                                                     int requestedHeight,
                                                     int verticalPaddingBorderGuess,
                                                     boolean requestedHeightIncludesPaddingBorder)

getSimpleName

public static String getSimpleName(Object widget)

setFloat

public static void setFloat(com.google.gwt.user.client.Element element,
                            String value)

getNativeScrollbarSize

public static int getNativeScrollbarSize()

runWebkitOverflowAutoFix

public static void runWebkitOverflowAutoFix(com.google.gwt.user.client.Element elem)

Run workaround for webkits overflow auto issue. See: our bug #2138 and https://bugs.webkit.org/show_bug.cgi?id=21462

Parameters:

elem - with overflow auto

parseRelativeSize

public static RenderInformation.FloatSize parseRelativeSize(UIDL uidl)

Parses the UIDL parameter and fetches the relative size of the component. If a dimension is not specified as relative it will return -1. If the UIDL does not contain width or height specifications this will return null.

Parameters:

uidl -

Returns:

isCached

public static boolean isCached(UIDL uidl)

alert

public static void alert(String string)

equals

public static boolean equals(Object a,
                             Object b)

updateRelativeChildrenAndSendSizeUpdateEvent

public static void updateRelativeChildrenAndSendSizeUpdateEvent(ApplicationConnection client,
                                                                com.google.gwt.user.client.ui.HasWidgets container)

updateRelativeChildrenAndSendSizeUpdateEvent

public static void updateRelativeChildrenAndSendSizeUpdateEvent(ApplicationConnection client,
                                                                com.google.gwt.user.client.ui.HasWidgets container,
                                                                Paintable widget)

getRequiredWidth

public static int getRequiredWidth(com.google.gwt.dom.client.Element element)

getRequiredHeight

public static int getRequiredHeight(com.google.gwt.dom.client.Element element)

getRequiredWidth

public static int getRequiredWidth(com.google.gwt.user.client.ui.Widget widget)

getRequiredHeight

public static int getRequiredHeight(com.google.gwt.user.client.ui.Widget widget)

mayHaveScrollBars

public static boolean mayHaveScrollBars(com.google.gwt.dom.client.Element pe)

Detects what is currently the overflow style attribute in given element.

Parameters:

pe - the element to detect

Returns:

true if auto or scroll

runIE7ZeroSizedBodyFix

public static void runIE7ZeroSizedBodyFix()

IE7 sometimes "forgets" to render content. This function runs a hack to workaround the bug if needed. This happens easily in framset. See #3295.

shakeBodyElement

public static void shakeBodyElement()

Does some very small adjustments to body element. We need this just to overcome some IE bugs.

getChildPaintableForElement

public static Paintable getChildPaintableForElement(ApplicationConnection client,
                                                    Container parent,
                                                    com.google.gwt.user.client.Element element)

Locates the child component of parent which contains the element element. The child component is also returned if "element" is part of its caption. If element is not part of any child component, null is returned. This method returns the immediate child of the parent that contains the element. See #getPaintableForElement(ApplicationConnection, Container, Element) for the deepest nested paintable of parent that contains the element.

Parameters:

client - A reference to ApplicationConnection

parent - The widget that contains element.

element - An element that is a sub element of the parent

Returns:

The Paintable which the element is a part of. Null if the element does not belong to a child.

getPaintableForElement

public static Paintable getPaintableForElement(ApplicationConnection client,
                                               com.google.gwt.user.client.ui.Widget parent,
                                               com.google.gwt.user.client.Element element)

Locates the nested child component of parent which contains the element element. The child component is also returned if "element" is part of its caption. If element is not part of any child component, null is returned. This method returns the deepest nested Paintable. See getChildPaintableForElement(ApplicationConnection, Container, Element) for the immediate child component of parent that contains the element.

Parameters:

client - A reference to ApplicationConnection

parent - The widget that contains element.

element - An element that is a sub element of the parent

Returns:

The Paintable which the element is a part of. Null if the element does not belong to a child.

focus

public static void focus(com.google.gwt.user.client.Element el)

Will (attempt) to focus the given DOM Element.

Parameters:

el - the element to focus

findWidget

public static <T> T findWidget(com.google.gwt.user.client.Element element,
                               Class<? extends com.google.gwt.user.client.ui.Widget> class1)

Helper method to find first instance of given Widget type found by traversing DOM upwards from given element.

Parameters:

element - the element where to start seeking of Widget

class1 - the Widget type to seek for

forceWebkitRedraw

public static void forceWebkitRedraw(com.google.gwt.user.client.Element element)

Force webkit to redraw an element

Parameters:

element - The element that should be redrawn

detachAttach

public static void detachAttach(com.google.gwt.user.client.Element element)

Detaches and re-attaches the element from its parent. The element is reattached at the same position in the DOM as it was before. Does nothing if the element is not attached to the DOM.

Parameters:

element - The element to detach and re-attach

sinkOnloadForImages

public static void sinkOnloadForImages(com.google.gwt.user.client.Element element)

getChildElementIndex

public static int getChildElementIndex(com.google.gwt.user.client.Element childElement)

Returns the index of the childElement within its parent.

Parameters:

subElement -

Returns:

setStyleTemporarily

public static void setStyleTemporarily(com.google.gwt.user.client.Element element,
                                       String styleProperty,
                                       String tempValue)

Temporarily sets the styleProperty to tempValue and then resets it to its current value. Used mainly to work around rendering issues in IE (and possibly in other browsers)

Parameters:

element - The target element

styleProperty - The name of the property to set

tempValue - The temporary value

getTouchOrMouseClientX

public static int getTouchOrMouseClientX(com.google.gwt.user.client.Event event)

A helper method to return the client position from an event. Returns position from either first changed touch (if touch event) or from the event itself.

Parameters:

event -

Returns:

getElementUnderMouse

public static com.google.gwt.user.client.Element getElementUnderMouse(com.google.gwt.dom.client.NativeEvent event)

Find the element corresponding to the coordinates in the passed mouse event. Please note that this is not always the same as the target of the event e.g. if event capture is used.

Parameters:

event - the mouse event to get coordinates from

Returns:

the element at the coordinates of the event

getTouchOrMouseClientY

public static int getTouchOrMouseClientY(com.google.gwt.user.client.Event event)

A helper method to return the client position from an event. Returns position from either first changed touch (if touch event) or from the event itself.

Parameters:

event -

Returns:

getTouchOrMouseClientY

public static int getTouchOrMouseClientY(com.google.gwt.dom.client.NativeEvent currentGwtEvent)

Parameters:

currentGwtEvent -

Returns:

See Also:

getTouchOrMouseClientY(Event)

getTouchOrMouseClientX

public static int getTouchOrMouseClientX(com.google.gwt.dom.client.NativeEvent event)

Parameters:

event -

Returns:

See Also:

getTouchOrMouseClientX(Event)

isTouchEvent

public static boolean isTouchEvent(com.google.gwt.user.client.Event event)

isTouchEvent

public static boolean isTouchEvent(com.google.gwt.dom.client.NativeEvent event)

simulateClickFromTouchEvent

public static void simulateClickFromTouchEvent(com.google.gwt.user.client.Event touchevent,
                                               com.google.gwt.user.client.ui.Widget widget)

getIEFocusedElement

public static com.google.gwt.user.client.Element getIEFocusedElement()

Gets the currently focused element for Internet Explorer.

Returns:

The currently focused element

setIEFocusedElement

public static void setIEFocusedElement(com.google.gwt.user.client.Element elem)

Gets the currently focused element for Internet Explorer.

isAttachedAndDisplayed

public static boolean isAttachedAndDisplayed(com.google.gwt.user.client.ui.Widget widget)

Kind of stronger version of isAttached(). In addition to std isAttached, this method checks that this widget nor any of its parents is hidden. Can be e.g used to check whether component should react to some events or not.

Parameters:

widget -

Returns:

true if attached and displayed

scrollIntoViewVertically

public static void scrollIntoViewVertically(com.google.gwt.user.client.Element elem)

Scrolls an element into view vertically only. Modified version of Element.scrollIntoView.

Parameters:

elem - The element to scroll into view

isTouchEventOrLeftMouseButton

public static boolean isTouchEventOrLeftMouseButton(com.google.gwt.user.client.Event event)

Checks if the given event is either a touch event or caused by the left mouse button

Parameters:

event -

Returns:

true if the event is a touch event or caused by the left mouse button, false otherwise