com.google.gwt.user.client.DOM Maven / Gradle / Ivy
/*
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.user.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.ImageElement;
import com.google.gwt.dom.client.OptionElement;
import com.google.gwt.dom.client.SelectElement;
import com.google.gwt.user.client.Event.NativePreviewEvent;
import com.google.gwt.user.client.impl.DOMImpl;
/**
* This class provides a set of static methods that allow you to manipulate the
* browser's Document Object Model (DOM). It contains methods for manipulating
* both {@link com.google.gwt.user.client.Element elements} and
* {@link com.google.gwt.user.client.Event events}.
*/
public class DOM {
private static class NativePreview extends BaseListenerWrapper
implements Event.NativePreviewHandler {
@Deprecated
public static void add(EventPreview listener) {
Event.addNativePreviewHandler(new NativePreview(listener));
}
public static void remove(EventPreview listener) {
baseRemove(Event.handlers, listener, NativePreviewEvent.getType());
}
private NativePreview(EventPreview listener) {
super(listener);
}
public void onPreviewNativeEvent(NativePreviewEvent event) {
// The legacy EventHandler should only fire if it is on the top of the
// stack (ie. the last one added).
if (event.isFirstHandler()) {
if (!listener.onEventPreview(Event.as(event.getNativeEvent()))) {
event.cancel();
}
}
}
}
// The current event being fired
private static Event currentEvent = null;
static final DOMImpl impl = GWT.create(DOMImpl.class);
private static Element sCaptureElem;
/**
* Adds an event preview to the preview stack. As long as this preview remains
* on the top of the stack, it will receive all events before they are fired
* to their listeners. Note that the event preview will receive all
* events, including those received due to bubbling, whereas normal event
* handlers only receive explicitly sunk events.
*
* @param preview the event preview to be added to the stack.
* @deprecated replaced by
* {@link Event#addNativePreviewHandler(Event.NativePreviewHandler)}
*/
@Deprecated
public static void addEventPreview(EventPreview preview) {
NativePreview.add(preview);
}
/**
* Appends one element to another's list of children.
*
* If the child element is a {@link com.google.gwt.user.client.ui.PotentialElement}, it is first
* resolved.
*
*
* @param parent the parent element
* @param child its new child
* @see com.google.gwt.user.client.ui.PotentialElement#resolve(Element)
*/
public static void appendChild(Element parent, Element child) {
assert !isPotential(parent) : "Cannot append to a PotentialElement";
// If child isn't a PotentialElement, resolve() returns
// the Element itself.
parent.appendChild(resolve(child));
}
/**
* Clones an element.
*
* @param elem the element to be cloned
* @param deep should children be cloned as well?
*/
public static com.google.gwt.user.client.Element clone(Element elem, boolean deep) {
return elem.cloneNode(deep).cast();
}
/**
* Compares two elements for equality. Note that this method is now deprecated
* because reference identity accurately reports equality.
*
* @param elem1 the first element to be compared
* @param elem2 the second element to be compared
* @return true if they are in fact the same element
* @deprecated Use identity comparison.
*/
@Deprecated
public static boolean compare(Element elem1, Element elem2) {
return elem1 == elem2;
}
/**
* Creates an HTML A element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createAnchor() {
return Document.get().createAnchorElement().cast();
}
/**
* Creates an HTML BUTTON element.
*
* @return the newly-created element
*/
@SuppressWarnings("deprecation")
public static com.google.gwt.user.client.Element createButton() {
return Document.get().createButtonElement().cast();
}
/**
* Creates an HTML CAPTION element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createCaption() {
return Document.get().createCaptionElement().cast();
}
/**
* Creates an HTML COL element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createCol() {
return Document.get().createColElement().cast();
}
/**
* Creates an HTML COLGROUP element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createColGroup() {
return Document.get().createColGroupElement().cast();
}
/**
* Creates an HTML DIV element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createDiv() {
return Document.get().createDivElement().cast();
}
/**
* Creates an HTML element.
*
* @param tagName the HTML tag of the element to be created
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createElement(String tagName) {
return Document.get().createElement(tagName).cast();
}
/**
* Creates an HTML FIELDSET element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createFieldSet() {
return Document.get().createFieldSetElement().cast();
}
/**
* Creates an HTML FORM element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createForm() {
return Document.get().createFormElement().cast();
}
/**
* Creates an HTML IFRAME element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createIFrame() {
return Document.get().createIFrameElement().cast();
}
/**
* Creates an HTML IMG element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createImg() {
return Document.get().createImageElement().cast();
}
/**
* Creates an HTML INPUT type='CHECK' element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createInputCheck() {
return Document.get().createCheckInputElement().cast();
}
/**
* Creates an HTML INPUT type='PASSWORD' element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createInputPassword() {
return Document.get().createPasswordInputElement().cast();
}
/**
* Creates an HTML INPUT type='RADIO' element.
*
* @param name the name of the group with which this radio button will be
* associated
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createInputRadio(String name) {
return Document.get().createRadioInputElement(name).cast();
}
/**
* Creates an HTML INPUT type='TEXT' element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createInputText() {
return Document.get().createTextInputElement().cast();
}
/**
* Creates an HTML LABEL element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createLabel() {
return Document.get().createLabelElement().cast();
}
/**
* Creates an HTML LEGEND element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createLegend() {
return Document.get().createLegendElement().cast();
}
/**
* Creates an HTML OPTION element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createOption() {
return Document.get().createOptionElement().cast();
}
/**
* Creates an HTML OPTIONS element.
*
* @return the newly-created element
* @deprecated there is no "options" element; use {@link #createOption()}
* instead
*/
@Deprecated
public static com.google.gwt.user.client.Element createOptions() {
return Document.get().createElement("options").cast();
}
/**
* Creates a single-selection HTML SELECT element. Equivalent to
*
*
* createSelect(false)
*
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createSelect() {
return Document.get().createSelectElement().cast();
}
/**
* Creates an HTML SELECT element.
*
* @param multiple true if multiple selection of options is allowed
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createSelect(boolean multiple) {
SelectElement selectElement = Document.get().createSelectElement();
selectElement.setMultiple(multiple);
return selectElement.cast();
}
/**
* Creates an HTML SPAN element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createSpan() {
return Document.get().createSpanElement().cast();
}
/**
* Creates an HTML TABLE element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTable() {
return Document.get().createTableElement().cast();
}
/**
* Creates an HTML TBODY element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTBody() {
return Document.get().createTBodyElement().cast();
}
/**
* Creates an HTML TD element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTD() {
return Document.get().createTDElement().cast();
}
/**
* Creates an HTML TEXTAREA element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTextArea() {
return Document.get().createTextAreaElement().cast();
}
/**
* Creates an HTML TFOOT element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTFoot() {
return Document.get().createTFootElement().cast();
}
/**
* Creates an HTML TH element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTH() {
return Document.get().createTHElement().cast();
}
/**
* Creates an HTML THEAD element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTHead() {
return Document.get().createTHeadElement().cast();
}
/**
* Creates an HTML TR element.
*
* @return the newly-created element
*/
public static com.google.gwt.user.client.Element createTR() {
return Document.get().createTRElement().cast();
}
/**
* Generates a unique DOM id. The id is of the form "gwt-id-".
*
* @return a unique DOM id
*/
public static String createUniqueId() {
return Document.get().createUniqueId();
}
/**
* Cancels bubbling for the given event. This will stop the event from being
* propagated to parent elements.
*
* @param evt the event on which to cancel bubbling
* @param cancel true to cancel bubbling
*/
public static void eventCancelBubble(Event evt, boolean cancel) {
impl.eventCancelBubble(evt, cancel);
}
/**
* Gets whether the ALT key was depressed when the given event occurred.
*
* @param evt the event to be tested
* @return true if ALT was depressed when the event occurred
* @deprecated Use {@link Event#getAltKey()} instead.
*/
@Deprecated
public static boolean eventGetAltKey(Event evt) {
return evt.getAltKey();
}
/**
* Gets the mouse buttons that were depressed when the given event occurred.
*
* @param evt the event to be tested
* @return a bit-field, defined by {@link Event#BUTTON_LEFT},
* {@link Event#BUTTON_MIDDLE}, and {@link Event#BUTTON_RIGHT}
* @deprecated Use {@link Event#getButton()} instead.
*/
@Deprecated
public static int eventGetButton(Event evt) {
return evt.getButton();
}
/**
* Gets the mouse x-position within the browser window's client area.
*
* @param evt the event to be tested
* @return the mouse x-position
* @deprecated Use {@link Event#getClientX()} instead.
*/
@Deprecated
public static int eventGetClientX(Event evt) {
return evt.getClientX();
}
/**
* Gets the mouse y-position within the browser window's client area.
*
* @param evt the event to be tested
* @return the mouse y-position
* @deprecated Use {@link Event#getClientY()} instead.
*/
@Deprecated
public static int eventGetClientY(Event evt) {
return evt.getClientY();
}
/**
* Gets whether the CTRL key was depressed when the given event occurred.
*
* @param evt the event to be tested
* @return true if CTRL was depressed when the event occurred
* @deprecated Use {@link Event#getCtrlKey()} instead.
*/
@Deprecated
public static boolean eventGetCtrlKey(Event evt) {
return evt.getCtrlKey();
}
/**
* Gets the current event that is being fired. The current event is only
* available within the lifetime of the onBrowserEvent function. Once the
* onBrowserEvent method returns, the current event is reset to null.
*
* @return the current event
*/
public static Event eventGetCurrentEvent() {
return currentEvent;
}
/**
* Gets the current target element of the given event. This is the element
* whose listener fired last, not the element which fired the event initially.
*
* @param evt the event
* @return the event's current target element
* @see DOM#eventGetTarget(Event)
*/
public static com.google.gwt.user.client.Element eventGetCurrentTarget(Event evt) {
return evt.getCurrentEventTarget().cast();
}
/**
* Gets the element from which the mouse pointer was moved (valid for
* {@link Event#ONMOUSEOVER} and {@link Event#ONMOUSEOUT}).
*
* @param evt the event to be tested
* @return the element from which the mouse pointer was moved
*/
public static com.google.gwt.user.client.Element eventGetFromElement(Event evt) {
return asOld(impl.eventGetFromElement(evt));
}
/**
* Gets the key code associated with this event.
*
*
* For {@link Event#ONKEYPRESS}, this method returns the Unicode value of the
* character generated. For {@link Event#ONKEYDOWN} and {@link Event#ONKEYUP},
* it returns the code associated with the physical key.
*
*
* @param evt the event to be tested
* @return the Unicode character or key code.
* @see com.google.gwt.user.client.ui.KeyboardListener
* @deprecated Use {@link Event#getKeyCode()} instead.
*/
@Deprecated
public static int eventGetKeyCode(Event evt) {
return evt.getKeyCode();
}
/**
* Gets whether the META key was depressed when the given event occurred.
*
* @param evt the event to be tested
* @return true if META was depressed when the event occurred
* @deprecated Use {@link Event#getMetaKey()} instead.
*/
@Deprecated
public static boolean eventGetMetaKey(Event evt) {
return evt.getMetaKey();
}
/**
* Gets the velocity of the mouse wheel associated with the event along the Y
* axis.
*
* The velocity of the event is an artifical measurement for relative
* comparisons of wheel activity. It is affected by some non-browser factors,
* including choice of input hardware and mouse acceleration settings. The
* sign of the velocity measurement agrees with the screen coordinate system;
* negative values are towards the origin and positive values are away from
* the origin. Standard scrolling speed is approximately ten units per event.
*
*
* @param evt the event to be examined.
* @return The velocity of the mouse wheel.
* @deprecated Use {@link Event#getMouseWheelVelocityY()} instead.
*/
@Deprecated
public static int eventGetMouseWheelVelocityY(Event evt) {
return evt.getMouseWheelVelocityY();
}
/**
* Gets the key-repeat state of this event. Only IE supports this attribute.
*
* @param evt the event to be tested
* @return true if this key event was an auto-repeat
* @deprecated not supported in any browser but IE
*/
@Deprecated
public static boolean eventGetRepeat(Event evt) {
return impl.eventGetRepeat(evt);
}
/**
* Gets the mouse x-position on the user's display.
*
* @param evt the event to be tested
* @return the mouse x-position
* @deprecated Use {@link Event#getScreenX()} instead.
*/
@Deprecated
public static int eventGetScreenX(Event evt) {
return evt.getScreenX();
}
/**
* Gets the mouse y-position on the user's display.
*
* @param evt the event to be tested
* @return the mouse y-position
* @deprecated Use {@link Event#getScreenY()} instead.
*/
@Deprecated
public static int eventGetScreenY(Event evt) {
return evt.getScreenY();
}
/**
* Gets whether the shift key was depressed when the given event occurred.
*
* @param evt the event to be tested
* @return true if shift was depressed when the event occurred
* @deprecated Use {@link Event#getShiftKey()} instead.
*/
@Deprecated
public static boolean eventGetShiftKey(Event evt) {
return evt.getShiftKey();
}
/**
* Returns the element that was the actual target of the given event.
*
* @param evt the event to be tested
* @return the target element
*/
public static com.google.gwt.user.client.Element eventGetTarget(Event evt) {
return evt.getEventTarget().cast();
}
/**
* Gets the element to which the mouse pointer was moved (only valid for
* {@link Event#ONMOUSEOUT} and {@link Event#ONMOUSEOVER}).
*
* @param evt the event to be tested
* @return the element to which the mouse pointer was moved
*/
public static com.google.gwt.user.client.Element eventGetToElement(Event evt) {
return asOld(impl.eventGetToElement(evt));
}
/**
* Gets the enumerated type of this event (as defined in {@link Event}).
*
* @param evt the event to be tested
* @return the event's enumerated type, or -1 if not defined
*/
public static int eventGetType(Event evt) {
return impl.eventGetTypeInt(evt);
}
/**
* Gets the type of the given event as a string.
*
* @param evt the event to be tested
* @return the event's type name
* @deprecated Use {@link Event#getType()} instead.
*/
@Deprecated
public static String eventGetTypeString(Event evt) {
return evt.getType();
}
/**
* Prevents the browser from taking its default action for the given event.
*
* @param evt the event whose default action is to be prevented
* @deprecated Use {@link Event#preventDefault()} instead.
*/
@Deprecated
public static void eventPreventDefault(Event evt) {
evt.preventDefault();
}
/**
* Sets the key code associated with the given keyboard event.
*
* @param evt the event whose key code is to be set
* @param key the new key code
* @deprecated this method only works in IE and should not have been added to
* the API
*/
@Deprecated
public static void eventSetKeyCode(Event evt, char key) {
impl.eventSetKeyCode(evt, key);
}
/**
* Returns a stringized version of the event. This string is for debugging
* purposes and will NOT be consistent on different browsers.
*
* @param evt the event to stringize
* @return a string form of the event
* @deprecated Use {@link Event#getString()} instead.
*/
@Deprecated
public static String eventToString(Event evt) {
return evt.getString();
}
/**
* Gets an element's absolute left coordinate in the document's coordinate
* system.
*
* @param elem the element to be measured
* @return the element's absolute left coordinate
* @deprecated Use {@link Element#getAbsoluteLeft()} instead.
*/
@Deprecated
public static int getAbsoluteLeft(Element elem) {
return elem.getAbsoluteLeft();
}
/**
* Gets an element's absolute top coordinate in the document's coordinate
* system.
*
* @param elem the element to be measured
* @return the element's absolute top coordinate
* @deprecated Use {@link Element#getAbsoluteTop()} instead.
*/
@Deprecated
public static int getAbsoluteTop(Element elem) {
return elem.getAbsoluteTop();
}
/**
* Gets any named property from an element, as a string.
*
* @param elem the element whose property is to be retrieved
* @param attr the name of the property
* @return the property's value
* @deprecated Use the more appropriately named
* {@link Element#getPropertyString(String)} instead.
*/
@Deprecated
public static String getAttribute(Element elem, String attr) {
return elem.getPropertyString(attr);
}
/**
* Gets a boolean property on the given element.
*
* @param elem the element whose property is to be set
* @param attr the name of the property to be set
* @return the property's value as a boolean
* @deprecated Use the more appropriately named
* {@link Element#getPropertyBoolean(String)} instead.
*/
@Deprecated
public static boolean getBooleanAttribute(Element elem, String attr) {
return elem.getPropertyBoolean(attr);
}
/**
* Gets the element that currently has mouse capture.
*
* @return a handle to the capture element, or null if none
* exists
*/
public static com.google.gwt.user.client.Element getCaptureElement() {
return asOld(sCaptureElem);
}
/**
* Gets an element's n-th child element.
*
* @param parent the element whose child is to be retrieved
* @param index the index of the child element
* @return the n-th child element
*/
public static com.google.gwt.user.client.Element getChild(Element parent, int index) {
return asOld(impl.getChild(parent, index));
}
/**
* Gets the number of child elements present in a given parent element.
*
* @param parent the element whose children are to be counted
* @return the number of children
*/
public static int getChildCount(Element parent) {
return impl.getChildCount(parent);
}
/**
* Gets the index of a given child element within its parent.
*
* @param parent the parent element
* @param child the child element
* @return the child's index within its parent, or -1 if it is
* not a child of the given parent
*/
public static int getChildIndex(Element parent, Element child) {
return impl.getChildIndex(parent, child);
}
/**
* Gets the named attribute from the element.
*
* @param elem the element whose property is to be retrieved
* @param attr the name of the attribute
* @return the value of the attribute
* @deprecated Use {@link Element#getAttribute(String)} instead.
*/
@Deprecated
public static String getElementAttribute(Element elem, String attr) {
return elem.getAttribute(attr);
}
/**
* Gets the element associated with the given unique id within the entire
* document.
*
* @param id the id whose associated element is to be retrieved
* @return the associated element, or null if none is found
*/
public static com.google.gwt.user.client.Element getElementById(String id) {
return asOld(Document.get().getElementById(id));
}
/**
* Gets any named property from an element, as a string.
*
* @param elem the element whose property is to be retrieved
* @param prop the name of the property
* @return the property's value
* @deprecated Use {@link Element#getProperty(String)} instead.
*/
@Deprecated
public static String getElementProperty(Element elem, String prop) {
return elem.getPropertyString(prop);
}
/**
* Gets any named property from an element, as a boolean.
*
* @param elem the element whose property is to be retrieved
* @param prop the name of the property
* @return the property's value as a boolean
* @deprecated Use {@link Element#getPropertyBoolean(String)} instead.
*/
@Deprecated
public static boolean getElementPropertyBoolean(Element elem, String prop) {
return elem.getPropertyBoolean(prop);
}
/**
* Gets any named property from an element, as an int.
*
* @param elem the element whose property is to be retrieved
* @param prop the name of the property
* @return the property's value as an int
* @deprecated Use {@link Element#getPropertyInt(String)} instead.
*/
@Deprecated
public static int getElementPropertyInt(Element elem, String prop) {
return elem.getPropertyInt(prop);
}
/**
* Gets the {@link EventListener} that will receive events for the given
* element. Only one such listener may exist for a single element.
*
* @param elem the element whose listener is to be set
* @return the element's event listener
*/
public static EventListener getEventListener(Element elem) {
return DOMImpl.getEventListener(elem);
}
/**
* Gets the current set of events sunk by a given element.
*
* @param elem the element whose events are to be retrieved
* @return a bitfield describing the events sunk on this element (its possible
* values are described in {@link Event})
*/
public static int getEventsSunk(Element elem) {
return impl.getEventsSunk(elem);
}
/**
* Gets the first child element of the given element.
*
* @param elem the element whose child is to be retrieved
* @return the child element
*/
public static com.google.gwt.user.client.Element getFirstChild(Element elem) {
return asOld(elem.getFirstChildElement());
}
/**
* Gets the src attribute of an img element. This method is paired with
* {@link #setImgSrc(Element, String)} so that it always returns the correct
* url.
*
* @param img a non-null img whose src attribute is to be read.
* @return the src url of the img
*/
public static String getImgSrc(Element img) {
return img. cast().getSrc();
}
/**
* Gets an HTML representation of an element's children.
*
* @param elem the element whose HTML is to be retrieved
* @return the HTML representation of the element's children
* @deprecated Use {@link Element#getInnerHTML()} instead.
*/
@Deprecated
public static String getInnerHTML(Element elem) {
return elem.getInnerHTML();
}
/**
* Gets the text contained within an element. If the element has child
* elements, only the text between them will be retrieved.
*
* @param elem the element whose inner text is to be retrieved
* @return the text inside this element
* @deprecated Use {@link Element#getInnerText()} instead.
*/
@Deprecated
public static String getInnerText(Element elem) {
return elem.getInnerText();
}
/**
* Gets an integer property on a given element.
*
* @param elem the element whose property is to be retrieved
* @param attr the name of the property to be retrieved
* @return the property's value as an integer
* @deprecated Use the more appropriately named
* {@link Element#getPropertyInt(String)} instead.
*/
@Deprecated
public static int getIntAttribute(Element elem, String attr) {
return elem.getPropertyInt(attr);
}
/**
* Gets an integer attribute on a given element's style.
*
* @param elem the element whose style attribute is to be retrieved
* @param attr the name of the attribute to be retrieved
* @return the style attribute's value as an integer
*/
public static native int getIntStyleAttribute(Element elem, String attr) /*-{
return parseInt(elem.style[attr]) || 0;
}-*/;
/**
* Gets an element's next sibling element.
*
* @param elem the element whose sibling is to be retrieved
* @return the sibling element
*/
public static com.google.gwt.user.client.Element getNextSibling(Element elem) {
return elem.getNextSibling().cast();
}
/**
* Gets an element's parent element.
*
* @param elem the element whose parent is to be retrieved
* @return the parent element
*/
public static com.google.gwt.user.client.Element getParent(Element elem) {
return asOld(elem.getParentElement());
}
/**
* Gets an attribute of the given element's style.
*
* @param elem the element whose style attribute is to be retrieved
* @param attr the name of the style attribute to be retrieved
* @return the style attribute's value
* @deprecated Use {@link Element#getStyle()} and
* {@link Style#getProperty(String)} instead.
*/
@Deprecated
public static String getStyleAttribute(Element elem, String attr) {
return elem.getStyle().getProperty(attr);
}
/**
* Inserts an element as a child of the given parent element, before another
* child of that parent.
*
* If the child element is a {@link com.google.gwt.user.client.ui.PotentialElement}, it is first
* resolved.
*
*
* @param parent the parent element
* @param child the child element to add to parent
* @param before an existing child element of parent before which
* child will be inserted
* @see com.google.gwt.user.client.ui.PotentialElement#resolve(Element)
*/
public static void insertBefore(Element parent, Element child, Element before) {
assert !isPotential(parent) : "Cannot insert into a PotentialElement";
// If child isn't a PotentialElement, resolve() returns
// the Element itself.
parent.insertBefore(resolve(child), before);
}
/**
* Inserts an element as a child of the given parent element.
*
* If the child element is a {@link com.google.gwt.user.client.ui.PotentialElement}, it is first
* resolved.
*
*
* @param parent the parent element
* @param child the child element to add to parent
* @param index the index before which the child will be inserted (any value
* greater than the number of existing children will cause the child
* to be appended)
* @see com.google.gwt.user.client.ui.PotentialElement#resolve(Element)
*/
public static void insertChild(Element parent, Element child, int index) {
assert !isPotential(parent) : "Cannot insert into a PotentialElement";
// If child isn't a PotentialElement, resolve() returns
// the Element itself.
impl.insertChild(parent, resolve(child), index);
}
/**
* Creates an <option> element and inserts it as a child of
* the specified <select> element. If the index is less
* than zero, or greater than or equal to the length of the list, then the
* option element will be appended to the end of the list.
*
* @param selectElem the <select> element
* @param item the text of the new item; cannot be null
* @param value the value attribute for the new
* <option>; cannot be null
* @param index the index at which to insert the child
*/
public static void insertListItem(Element selectElem, String item,
String value, int index) {
assert !isPotential(selectElem) : "Cannot insert into a PotentialElement";
SelectElement select = selectElem. cast();
OptionElement option = Document.get().createOptionElement();
option.setText(item);
option.setValue(value);
if ((index == -1) || (index == select.getLength())) {
select.add(option, null);
} else {
OptionElement before = select.getOptions().getItem(index);
select.add(option, before);
}
}
private static native boolean isPotential(JavaScriptObject o) /*-{
try {
return (!!o) && (!!o.__gwt_resolve);
} catch (e) {
return false;
}
}-*/;
private static native Element resolve(Element maybePotential) /*-{
return maybePotential.__gwt_resolve ? maybePotential.__gwt_resolve() : maybePotential;
}-*/;
/**
* Determine whether one element is equal to, or the child of, another.
*
* @param parent the potential parent element
* @param child the potential child element
* @return true if the relationship holds
* @deprecated Use {@link Element#isOrHasChild(Element)} instead.
*/
@Deprecated
public static boolean isOrHasChild(Element parent, Element child) {
return parent.isOrHasChild(child);
}
/**
* Releases mouse/touch/gesture capture on the given element. Calling this
* method has no effect if the element does not currently have
* mouse/touch/gesture capture.
*
* @param elem the element to release capture
* @see #setCapture(Element)
*/
public static void releaseCapture(Element elem) {
if ((sCaptureElem != null) && elem == sCaptureElem) {
sCaptureElem = null;
}
impl.releaseCapture(elem);
}
/**
* Removes a child element from the given parent element.
*
* @param parent the parent element
* @param child the child element to be removed
* @deprecated Use {@link Element#removeChild(Element)} instead.
*/
@Deprecated
public static void removeChild(Element parent, Element child) {
parent.removeChild(child);
}
/**
* Removes the named attribute from the given element.
*
* @param elem the element whose attribute is to be removed
* @param attr the name of the element to remove
* @deprecated Use {@link Element#removeAttribute(String)} instead.
*/
@Deprecated
public static void removeElementAttribute(Element elem, String attr) {
elem.removeAttribute(attr);
}
/**
* Removes an element from the preview stack. This element will no longer
* capture events, though any preview underneath it will begin to do so.
*
* @param preview the event preview to be removed from the stack
* @deprecated use {@link com.google.gwt.event.shared.HandlerRegistration}
* returned from
* {@link Event#addNativePreviewHandler(Event.NativePreviewHandler)}
*/
@Deprecated
public static void removeEventPreview(EventPreview preview) {
NativePreview.remove(preview);
}
/**
* Scrolls the given element into view.
*
*
* This method crawls up the DOM hierarchy, adjusting the scrollLeft and
* scrollTop properties of each scrollable element to ensure that the
* specified element is completely in view. It adjusts each scroll position by
* the minimum amount necessary.
*
*
* @param elem the element to be made visible
* @deprecated Use {@link Element#scrollIntoView()} instead.
*/
@Deprecated
public static void scrollIntoView(Element elem) {
elem.scrollIntoView();
}
/**
* Sets a property on the given element.
*
* @param elem the element whose property is to be set
* @param attr the name of the property to be set
* @param value the new property value
* @deprecated Use the more appropriately named
* {@link Element#setPropertyString(String, String)} instead.
*/
@Deprecated
public static void setAttribute(Element elem, String attr, String value) {
elem.setPropertyString(attr, value);
}
/**
* Sets a boolean property on the given element.
*
* @param elem the element whose property is to be set
* @param attr the name of the property to be set
* @param value the property's new boolean value
* @deprecated Use the more appropriately named
* {@link Element#setPropertyBoolean(String, boolean)}
* instead.
*/
@Deprecated
public static void setBooleanAttribute(Element elem, String attr,
boolean value) {
elem.setPropertyBoolean(attr, value);
}
/**
* Sets mouse/touch/gesture capture on the given element. This element will
* directly receive all mouse events until {@link #releaseCapture(Element)} is
* called on it.
*
* @param elem the element on which to set mouse/touch/gesture capture
*/
public static void setCapture(Element elem) {
sCaptureElem = elem;
impl.setCapture(elem);
}
/**
* Sets an attribute on a given element.
*
* @param elem element whose attribute is to be set
* @param attr the name of the attribute
* @param value the value to which the attribute should be set
* @deprecated Use {@link Element#setAttribute(String, String)} instead.
*/
@Deprecated
public static void setElementAttribute(Element elem, String attr, String value) {
elem.setAttribute(attr, value);
}
/**
* Sets a property on the given element.
*
* @param elem the element whose property is to be set
* @param prop the name of the property to be set
* @param value the new property value
* @deprecated Use {@link Element#setPropertyString(String, String)} instead.
*/
@Deprecated
public static void setElementProperty(Element elem, String prop, String value) {
elem.setPropertyString(prop, value);
}
/**
* Sets a boolean property on the given element.
*
* @param elem the element whose property is to be set
* @param prop the name of the property to be set
* @param value the new property value as a boolean
* @deprecated Use {@link Element#setPropertyBoolean(String, boolean)} instead.
*/
@Deprecated
public static void setElementPropertyBoolean(Element elem, String prop,
boolean value) {
elem.setPropertyBoolean(prop, value);
}
/**
* Sets an int property on the given element.
*
* @param elem the element whose property is to be set
* @param prop the name of the property to be set
* @param value the new property value as an int
* @deprecated Use {@link Element#setPropertyInt(String, int)} instead.
*/
@Deprecated
public static void setElementPropertyInt(Element elem, String prop, int value) {
elem.setPropertyInt(prop, value);
}
/**
* Sets the {@link EventListener} to receive events for the given element.
* Only one such listener may exist for a single element.
*
* @param elem the element whose listener is to be set
* @param listener the listener to receive {@link Event events}
*/
public static void setEventListener(Element elem, EventListener listener) {
DOMImpl.setEventListener(elem, listener);
}
/**
* Sets the src attribute of an img element. This method ensures that imgs
* only ever have their contents requested one single time from the server.
*
* @param img a non-null img whose src attribute will be set.
* @param src a non-null url for the img
*/
public static void setImgSrc(Element img, String src) {
img. cast().setSrc(src);
}
/**
* Sets the HTML contained within an element.
*
* @param elem the element whose inner HTML is to be set
* @param html the new html
* @deprecated Use {@link Element#setInnerHTML(String)} instead.
*/
@Deprecated
public static void setInnerHTML(Element elem, String html) {
elem.setInnerHTML(html);
}
/**
* Sets the text contained within an element. If the element already has
* children, they will be destroyed.
*
* @param elem the element whose inner text is to be set
* @param text the new text
* @deprecated Use {@link Element#setInnerText(String)} instead.
*/
@Deprecated
public static void setInnerText(Element elem, String text) {
elem.setInnerText(text);
}
/**
* Sets an integer property on the given element.
*
* @param elem the element whose property is to be set
* @param attr the name of the property to be set
* @param value the property's new integer value
* @deprecated Use the more appropriately named
* {@link Element#setPropertyInt(String, int)} instead.
*/
@Deprecated
public static void setIntAttribute(Element elem, String attr, int value) {
elem.setPropertyInt(attr, value);
}
/**
* Sets an integer attribute on the given element's style.
*
* @param elem the element whose style attribute is to be set
* @param attr the name of the style attribute to be set
* @param value the style attribute's new integer value
*/
public static void setIntStyleAttribute(Element elem, String attr, int value) {
elem.getStyle().setProperty(attr, Integer.toString(value));
}
/**
* Sets the option text of the given select object.
*
* @param select the select object whose option text is being set
* @param text the text to set
* @param index the index of the option whose text should be set
*/
public static void setOptionText(Element select, String text, int index) {
select. cast().getOptions().getItem(index).setText(text);
}
/**
* Sets an attribute on the given element's style.
*
* @param elem the element whose style attribute is to be set
* @param attr the name of the style attribute to be set
* @param value the style attribute's new value
* @deprecated Use {@link Element#getStyle()} and
* {@link Style#setProperty(String, String)} instead.
*/
@Deprecated
public static void setStyleAttribute(Element elem, String attr, String value) {
elem.getStyle().setProperty(attr, value);
}
/**
* Sinks a named event. Events will be fired to the nearest
* {@link EventListener} specified on any of the element's parents.
*
* @param elem the element whose events are to be retrieved
* @param eventTypeName name of the event to sink on this element
*/
public static void sinkBitlessEvent(Element elem, String eventTypeName) {
impl.sinkBitlessEvent(elem, eventTypeName);
}
/**
* Sets the current set of events sunk by a given element. These events will
* be fired to the nearest {@link EventListener} specified on any of the
* element's parents.
*
* @param elem the element whose events are to be retrieved
* @param eventBits a bitfield describing the events sunk on this element (its
* possible values are described in {@link Event})
*/
public static void sinkEvents(Element elem, int eventBits) {
impl.sinkEvents(elem, eventBits);
}
/**
* Returns a stringized version of the element. This string is for debugging
* purposes and will NOT be consistent on different browsers.
*
* @param elem the element to stringize
* @return a string form of the element
* @deprecated Use {@link Element#getString()} instead.
*/
@Deprecated
public static String toString(Element elem) {
return elem.getString();
}
/**
* @deprecated As of GWT 1.5, replaced by {@link Window#getClientHeight()}
*/
@Deprecated
public static int windowGetClientHeight() {
return Window.getClientHeight();
}
/**
* @deprecated As of GWT 1.5, replaced by {@link Window#getClientWidth()}
*/
@Deprecated
public static int windowGetClientWidth() {
return Window.getClientWidth();
}
/**
* This method is called directly by native code when any event is fired.
*
* @param evt the handle to the event being fired.
* @param elem the handle to the element that received the event.
* @param listener the listener associated with the element that received the
* event.
*/
public static void dispatchEvent(Event evt, Element elem, EventListener listener) {
// Preserve the current event in case we are in a reentrant event dispatch.
Event prevCurrentEvent = currentEvent;
currentEvent = evt;
dispatchEventImpl(evt, elem, listener);
currentEvent = prevCurrentEvent;
}
/**
* This method is a similar to {@link #dispatchEvent(Event, Element, EventListener)} but only
* dispatches if an event listener is set to element.
*
* @param evt the handle to the event being fired.
* @param elem the handle to the element that received the event.
* @return {@code true} if the event was dispatched
*/
public static boolean dispatchEvent(Event evt, Element elem) {
EventListener eventListener = getEventListener(elem);
if (eventListener == null) {
return false;
}
dispatchEvent(evt, elem, eventListener);
return true;
}
/**
* Initialize the event system if it has not already been initialized.
*/
static void maybeInitializeEventSystem() {
impl.maybeInitializeEventSystem();
}
/**
* This method is called directly by native code when event preview is being
* used.
*
* @param evt a handle to the event being previewed
* @return false to cancel the event
*/
public static boolean previewEvent(Event evt) {
// Fire a NativePreviewEvent to NativePreviewHandlers
boolean ret = Event.fireNativePreviewEvent(evt);
// If the preview cancels the event, stop it from bubbling and performing
// its default action. Check for a null evt to allow unit tests to run.
if (!ret && evt != null) {
evt.stopPropagation();
evt.preventDefault();
}
return ret;
}
private static void dispatchEventImpl(Event evt, Element elem,
EventListener listener) {
// If this element has capture...
if (elem == sCaptureElem) {
// ... and it's losing capture, clear sCaptureElem.
if (eventGetType(evt) == Event.ONLOSECAPTURE) {
sCaptureElem = null;
}
}
// Pass the event to the listener.
listener.onBrowserEvent(evt);
}
/**
* Provided as a convenient way to upcast values statically typed as
* {@link Element} to {@link com.google.gwt.user.client.Element}.
* For easier upgrades in the future, it's recommended that this function
* only be called within a return statement.
*
* Does not throw a {@link NullPointerException} if elem is null.
*/
public static com.google.gwt.user.client.Element asOld(Element elem) {
return (com.google.gwt.user.client.Element) elem;
}
}