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/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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.vaadin.client;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.AnchorElement;
import com.google.gwt.dom.client.DivElement;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.dom.client.Node;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Display;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.dom.client.Touch;
import com.google.gwt.event.dom.client.KeyEvent;
import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.EventListener;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.shared.util.SharedUtil;
/**
* Utility methods which are related to client side code only
*/
public class WidgetUtil {
/**
* Helper method for debugging purposes.
*
* Stops execution on firefox browsers on a breakpoint.
*
*/
public static native void browserDebugger()
/*-{
if($wnd.console)
debugger;
}-*/;
/**
* Helper method for a bug fix #14041. For mozilla getKeyCode return 0 for
* space bar (because space is considered as char). If return 0 use
* getCharCode.
*
* @param event
* @return return key code
* @since 7.2.4
*/
public static int getKeyCode(KeyEvent event) {
int keyCode = event.getNativeEvent().getKeyCode();
if (keyCode == 0) {
keyCode = event.getNativeEvent().getCharCode();
}
return keyCode;
}
/**
*
* 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.
*
* @param x
* @param y
* @return the element at given coordinates
*/
public static native Element getElementFromPoint(int clientX, int clientY)
/*-{
var el = $wnd.document.elementFromPoint(clientX, clientY);
// Call elementFromPoint two times to make sure IE8 also returns something sensible if the application is running in an iframe
el = $wnd.document.elementFromPoint(clientX, clientY);
if(el != null && el.nodeType == 3) {
el = el.parentNode;
}
return el;
}-*/;
public static float parseRelativeSize(String size) {
if (size == null || !size.endsWith("%")) {
return -1;
}
try {
return Float.parseFloat(size.substring(0, size.length() - 1));
} catch (Exception e) {
getLogger().warning("Unable to parse relative size");
return -1;
}
}
private static final Element escapeHtmlHelper = DOM.createDiv();
/**
* Converts html entities to text.
*
* @param html
* @return escaped string presentation of given html
*/
public static String escapeHTML(String html) {
DOM.setInnerText(escapeHtmlHelper, html);
String escapedText = DOM.getInnerHTML(escapeHtmlHelper);
if (BrowserInfo.get().isIE8()) {
// #7478 IE8 "incorrectly" returns "
" for newlines set using
// setInnerText. The same for " " which is converted to " "
escapedText = escapedText.replaceAll("<(BR|br)>", "\n");
escapedText = escapedText.replaceAll(" ", " ");
}
return escapedText;
}
/**
* Escapes the string so it is safe to write inside an HTML attribute.
*
* @param attribute
* The string to escape
* @return An escaped version of attribute .
*/
public static String escapeAttribute(String attribute) {
if (attribute == null) {
return "";
}
attribute = attribute.replace("\"", """);
attribute = attribute.replace("'", "'");
attribute = attribute.replace(">", ">");
attribute = attribute.replace("<", "<");
attribute = attribute.replace("&", "&");
return attribute;
}
/**
* Clones given element as in JavaScript.
*
* Deprecate this if there appears similar method into GWT someday.
*
* @param element
* @param deep
* clone child tree also
* @return
*/
public static native Element cloneNode(Element element, boolean deep)
/*-{
return element.cloneNode(deep);
}-*/;
public static int measureHorizontalPaddingAndBorder(Element element,
int paddingGuess) {
String originalWidth = DOM.getStyleAttribute(element, "width");
int originalOffsetWidth = element.getOffsetWidth();
int widthGuess = (originalOffsetWidth - paddingGuess);
if (widthGuess < 1) {
widthGuess = 1;
}
element.getStyle().setWidth(widthGuess, Unit.PX);
int padding = element.getOffsetWidth() - widthGuess;
element.getStyle().setProperty("width", originalWidth);
return padding;
}
public static int measureVerticalPaddingAndBorder(Element element,
int paddingGuess) {
String originalHeight = DOM.getStyleAttribute(element, "height");
int originalOffsetHeight = element.getOffsetHeight();
int widthGuess = (originalOffsetHeight - paddingGuess);
if (widthGuess < 1) {
widthGuess = 1;
}
element.getStyle().setHeight(widthGuess, Unit.PX);
int padding = element.getOffsetHeight() - widthGuess;
element.getStyle().setProperty("height", originalHeight);
return padding;
}
public static int measureHorizontalBorder(Element element) {
int borders;
if (BrowserInfo.get().isIE()) {
String width = element.getStyle().getProperty("width");
String height = element.getStyle().getProperty("height");
int offsetWidth = element.getOffsetWidth();
int offsetHeight = element.getOffsetHeight();
if (offsetHeight < 1) {
offsetHeight = 1;
}
if (offsetWidth < 1) {
offsetWidth = 10;
}
element.getStyle().setPropertyPx("height", offsetHeight);
element.getStyle().setPropertyPx("width", offsetWidth);
borders = element.getOffsetWidth() - element.getClientWidth();
element.getStyle().setProperty("width", width);
element.getStyle().setProperty("height", height);
} else {
borders = element.getOffsetWidth()
- element.getPropertyInt("clientWidth");
}
assert borders >= 0;
return borders;
}
public static int measureVerticalBorder(Element element) {
int borders;
if (BrowserInfo.get().isIE()) {
String width = element.getStyle().getProperty("width");
String height = element.getStyle().getProperty("height");
int offsetWidth = element.getOffsetWidth();
int offsetHeight = element.getOffsetHeight();
if (offsetHeight < 1) {
offsetHeight = 1;
}
if (offsetWidth < 1) {
offsetWidth = 10;
}
element.getStyle().setPropertyPx("width", offsetWidth);
element.getStyle().setPropertyPx("height", offsetHeight);
borders = element.getOffsetHeight()
- element.getPropertyInt("clientHeight");
element.getStyle().setProperty("height", height);
element.getStyle().setProperty("width", width);
} else {
borders = element.getOffsetHeight()
- element.getPropertyInt("clientHeight");
}
assert borders >= 0;
return borders;
}
public static int measureMarginLeft(Element element) {
return element.getAbsoluteLeft()
- element.getParentElement().getAbsoluteLeft();
}
public static int setHeightExcludingPaddingAndBorder(Widget widget,
String height, int paddingBorderGuess) {
if (height.equals("")) {
setHeight(widget, "");
return paddingBorderGuess;
} else if (height.endsWith("px")) {
int pixelHeight = Integer.parseInt(height.substring(0,
height.length() - 2));
return setHeightExcludingPaddingAndBorder(widget.getElement(),
pixelHeight, paddingBorderGuess, false);
} else {
// Set the height in unknown units
setHeight(widget, height);
// Use the offsetWidth
return setHeightExcludingPaddingAndBorder(widget.getElement(),
widget.getOffsetHeight(), paddingBorderGuess, true);
}
}
private static void setWidth(Widget widget, String width) {
widget.getElement().getStyle().setProperty("width", width);
}
private static void setHeight(Widget widget, String height) {
widget.getElement().getStyle().setProperty("height", height);
}
public static int setWidthExcludingPaddingAndBorder(Widget widget,
String width, int paddingBorderGuess) {
if (width.equals("")) {
setWidth(widget, "");
return paddingBorderGuess;
} else if (width.endsWith("px")) {
int pixelWidth = Integer.parseInt(width.substring(0,
width.length() - 2));
return setWidthExcludingPaddingAndBorder(widget.getElement(),
pixelWidth, paddingBorderGuess, false);
} else {
setWidth(widget, width);
return setWidthExcludingPaddingAndBorder(widget.getElement(),
widget.getOffsetWidth(), paddingBorderGuess, true);
}
}
public static int setWidthExcludingPaddingAndBorder(Element element,
int requestedWidth, int horizontalPaddingBorderGuess,
boolean requestedWidthIncludesPaddingBorder) {
int widthGuess = requestedWidth - horizontalPaddingBorderGuess;
if (widthGuess < 0) {
widthGuess = 0;
}
element.getStyle().setWidth(widthGuess, Unit.PX);
int captionOffsetWidth = DOM.getElementPropertyInt(element,
"offsetWidth");
int actualPadding = captionOffsetWidth - widthGuess;
if (requestedWidthIncludesPaddingBorder) {
actualPadding += actualPadding;
}
if (actualPadding != horizontalPaddingBorderGuess) {
int w = requestedWidth - actualPadding;
if (w < 0) {
// Cannot set negative width even if we would want to
w = 0;
}
element.getStyle().setWidth(w, Unit.PX);
}
return actualPadding;
}
public static int setHeightExcludingPaddingAndBorder(Element element,
int requestedHeight, int verticalPaddingBorderGuess,
boolean requestedHeightIncludesPaddingBorder) {
int heightGuess = requestedHeight - verticalPaddingBorderGuess;
if (heightGuess < 0) {
heightGuess = 0;
}
element.getStyle().setHeight(heightGuess, Unit.PX);
int captionOffsetHeight = DOM.getElementPropertyInt(element,
"offsetHeight");
int actualPadding = captionOffsetHeight - heightGuess;
if (requestedHeightIncludesPaddingBorder) {
actualPadding += actualPadding;
}
if (actualPadding != verticalPaddingBorderGuess) {
int h = requestedHeight - actualPadding;
if (h < 0) {
// Cannot set negative height even if we would want to
h = 0;
}
element.getStyle().setHeight(h, Unit.PX);
}
return actualPadding;
}
public static void setFloat(Element element, String value) {
if (BrowserInfo.get().isIE()) {
element.getStyle().setProperty("styleFloat", value);
} else {
element.getStyle().setProperty("cssFloat", value);
}
}
private static int detectedScrollbarSize = -1;
public static int getNativeScrollbarSize() {
if (detectedScrollbarSize < 0) {
Element scroller = DOM.createDiv();
scroller.getStyle().setProperty("width", "50px");
scroller.getStyle().setProperty("height", "50px");
scroller.getStyle().setProperty("overflow", "scroll");
scroller.getStyle().setProperty("position", "absolute");
scroller.getStyle().setProperty("marginLeft", "-5000px");
RootPanel.getBodyElement().appendChild(scroller);
detectedScrollbarSize = scroller.getOffsetWidth()
- scroller.getPropertyInt("clientWidth");
RootPanel.getBodyElement().removeChild(scroller);
}
return detectedScrollbarSize;
}
/**
* Defers the execution of {@link #runWebkitOverflowAutoFix(Element)}
*
* @since 7.2.6
* @param elem
* with overflow auto
*/
public static void runWebkitOverflowAutoFixDeferred(final Element elem) {
Scheduler.get().scheduleDeferred(new Command() {
@Override
public void execute() {
WidgetUtil.runWebkitOverflowAutoFix(elem);
}
});
}
/**
* Run workaround for webkits overflow auto issue.
*
* See: our bug #2138 and https://bugs.webkit.org/show_bug.cgi?id=21462
*
* @param elem
* with overflow auto
*/
public static void runWebkitOverflowAutoFix(final Element elem) {
// Add max version if fix lands sometime to Webkit
// Starting from Opera 11.00, also a problem in Opera
if (BrowserInfo.get().requiresOverflowAutoFix()) {
final String originalOverflow = elem.getStyle().getProperty(
"overflow");
final String originalOverflowX = elem.getStyle().getProperty(
"overflowX");
final String originalOverflowY = elem.getStyle().getProperty(
"overflowY");
if ("hidden".equals(originalOverflow)
|| "hidden".equals(originalOverflowX)
|| "hidden".equals(originalOverflowY)) {
return;
}
// check the scrolltop value before hiding the element
final int scrolltop = elem.getScrollTop();
final int scrollleft = elem.getScrollLeft();
elem.getStyle().setProperty("overflow", "hidden");
Scheduler.get().scheduleDeferred(new Command() {
@Override
public void execute() {
// Dough, Safari scroll auto means actually just a moped
elem.getStyle().setProperty("overflow", originalOverflow);
if (!originalOverflowX.isEmpty()) {
elem.getStyle().setProperty("overflowX",
originalOverflowX);
}
if (!originalOverflowY.isEmpty()) {
elem.getStyle().setProperty("overflowY",
originalOverflowY);
}
if (scrolltop > 0 || elem.getScrollTop() > 0) {
int scrollvalue = scrolltop;
if (scrollvalue == 0) {
// mysterious are the ways of webkits scrollbar
// handling. In some cases webkit reports bad (0)
// scrolltop before hiding the element temporary,
// sometimes after.
scrollvalue = elem.getScrollTop();
}
// fix another bug where scrollbar remains in wrong
// position
elem.setScrollTop(scrollvalue - 1);
elem.setScrollTop(scrollvalue);
}
// fix for #6940 : Table horizontal scroll sometimes not
// updated when collapsing/expanding columns
// Also appeared in Safari 5.1 with webkit 534 (#7667)
if ((BrowserInfo.get().isChrome() || (BrowserInfo.get()
.isSafari() && BrowserInfo.get().getWebkitVersion() >= 534))
&& (scrollleft > 0 || elem.getScrollLeft() > 0)) {
int scrollvalue = scrollleft;
if (scrollvalue == 0) {
// mysterious are the ways of webkits scrollbar
// handling. In some cases webkit may report a bad
// (0) scrollleft before hiding the element
// temporary, sometimes after.
scrollvalue = elem.getScrollLeft();
}
// fix another bug where scrollbar remains in wrong
// position
elem.setScrollLeft(scrollvalue - 1);
elem.setScrollLeft(scrollvalue);
}
}
});
}
}
public static void alert(String string) {
if (true) {
Window.alert(string);
}
}
/**
* Gets the border-box width for the given element, i.e. element width +
* border + padding. Always rounds up to nearest integer.
*
* @param element
* The element to check
* @return The border-box width for the element
*/
public static int getRequiredWidth(com.google.gwt.dom.client.Element element) {
int reqWidth = getRequiredWidthBoundingClientRect(element);
if (BrowserInfo.get().isIE() && !BrowserInfo.get().isIE8()) {
int csSize = getRequiredWidthComputedStyle(element);
if (csSize == reqWidth + 1) {
// If computed style reports one pixel larger than requiredWidth
// we would be rounding in the wrong direction in IE9. Round up
// instead.
// We do not always use csSize as it e.g. for 100% wide Labels
// in GridLayouts produces senseless values (see e.g.
// ThemeTestUI with Runo).
return csSize;
}
}
return reqWidth;
}
/**
* Gets the border-box height for the given element, i.e. element height +
* border + padding. Always rounds up to nearest integer.
*
* @param element
* The element to check
* @return The border-box height for the element
*/
public static int getRequiredHeight(
com.google.gwt.dom.client.Element element) {
int reqHeight = getRequiredHeightBoundingClientRect(element);
if (BrowserInfo.get().isIE() && !BrowserInfo.get().isIE8()) {
int csSize = getRequiredHeightComputedStyle(element);
if (csSize == reqHeight + 1) {
// If computed style reports one pixel larger than
// requiredHeight we would be rounding in the wrong direction in
// IE9. Round up instead.
// We do not always use csSize as it e.g. for 100% wide Labels
// in GridLayouts produces senseless values (see e.g.
// ThemeTestUI with Runo).
return csSize;
}
}
return reqHeight;
}
/**
* Calculates the width of the element's bounding rectangle.
*
* In case the browser doesn't support bounding rectangles, the returned
* value is the offset width.
*
* @param element
* the element of which to calculate the width
* @return the width of the element
*/
public static int getRequiredWidthBoundingClientRect(
com.google.gwt.dom.client.Element element) {
return (int) Math
.ceil(getRequiredWidthBoundingClientRectDouble(element));
}
/**
* Calculates the width of the element's bounding rectangle to subpixel
* precision.
*
* In case the browser doesn't support bounding rectangles, the returned
* value is the offset width.
*
* @param element
* the element of which to calculate the width
* @return the subpixel-accurate width of the element
* @since 7.4
*/
public static native double getRequiredWidthBoundingClientRectDouble(
com.google.gwt.dom.client.Element element)
/*-{
if (element.getBoundingClientRect) {
var rect = element.getBoundingClientRect();
return rect.right - rect.left;
} else {
return element.offsetWidth;
}
}-*/;
public static native int getRequiredHeightComputedStyle(
com.google.gwt.dom.client.Element element)
/*-{
var cs = element.ownerDocument.defaultView.getComputedStyle(element);
var heightPx = cs.height;
if(heightPx == 'auto'){
// Fallback for when IE reports auto
heightPx = @com.vaadin.client.WidgetUtil::getRequiredHeightBoundingClientRect(Lcom/google/gwt/dom/client/Element;)(element) + 'px';
}
var borderTopPx = cs.borderTop;
var borderBottomPx = cs.borderBottom;
var paddingTopPx = cs.paddingTop;
var paddingBottomPx = cs.paddingBottom;
var height = heightPx.substring(0,heightPx.length-2);
var border = borderTopPx.substring(0,borderTopPx.length-2)+borderBottomPx.substring(0,borderBottomPx.length-2);
var padding = paddingTopPx.substring(0,paddingTopPx.length-2)+paddingBottomPx.substring(0,paddingBottomPx.length-2);
return Math.ceil(height+border+padding);
}-*/;
public static native int getRequiredWidthComputedStyle(
com.google.gwt.dom.client.Element element)
/*-{
var cs = element.ownerDocument.defaultView.getComputedStyle(element);
var widthPx = cs.width;
if(widthPx == 'auto'){
// Fallback for when IE reports auto
widthPx = @com.vaadin.client.WidgetUtil::getRequiredWidthBoundingClientRect(Lcom/google/gwt/dom/client/Element;)(element) + 'px';
}
var borderLeftPx = cs.borderLeft;
var borderRightPx = cs.borderRight;
var paddingLeftPx = cs.paddingLeft;
var paddingRightPx = cs.paddingRight;
var width = widthPx.substring(0,widthPx.length-2);
var border = borderLeftPx.substring(0,borderLeftPx.length-2)+borderRightPx.substring(0,borderRightPx.length-2);
var padding = paddingLeftPx.substring(0,paddingLeftPx.length-2)+paddingRightPx.substring(0,paddingRightPx.length-2);
return Math.ceil(width+border+padding);
}-*/;
/**
* Calculates the height of the element's bounding rectangle.
*
* In case the browser doesn't support bounding rectangles, the returned
* value is the offset height.
*
* @param element
* the element of which to calculate the height
* @return the height of the element
*/
public static int getRequiredHeightBoundingClientRect(
com.google.gwt.dom.client.Element element) {
return (int) Math
.ceil(getRequiredHeightBoundingClientRectDouble(element));
}
/**
* Calculates the height of the element's bounding rectangle to subpixel
* precision.
*
* In case the browser doesn't support bounding rectangles, the returned
* value is the offset height.
*
* @param element
* the element of which to calculate the height
* @return the subpixel-accurate height of the element
* @since 7.4
*/
public static native double getRequiredHeightBoundingClientRectDouble(
com.google.gwt.dom.client.Element element)
/*-{
var height;
if (element.getBoundingClientRect != null) {
var rect = element.getBoundingClientRect();
height = rect.bottom - rect.top;
} else {
height = element.offsetHeight;
}
return height;
}-*/;
public static int getRequiredWidth(Widget widget) {
return getRequiredWidth(widget.getElement());
}
public static int getRequiredHeight(Widget widget) {
return getRequiredHeight(widget.getElement());
}
/**
* Detects what is currently the overflow style attribute in given element.
*
* @param pe
* the element to detect
* @return true if auto or scroll
*/
public static boolean mayHaveScrollBars(com.google.gwt.dom.client.Element pe) {
String overflow = getComputedStyle(pe, "overflow");
if (overflow != null) {
if (overflow.equals("auto") || overflow.equals("scroll")) {
return true;
} else {
return false;
}
} else {
return false;
}
}
/**
* A simple helper method to detect "computed style" (aka style sheets +
* element styles). Values returned differ a lot depending on browsers.
* Always be very careful when using this.
*
* @param el
* the element from which the style property is detected
* @param p
* the property to detect
* @return String value of style property
*/
private static native String getComputedStyle(
com.google.gwt.dom.client.Element el, String p)
/*-{
try {
if (el.currentStyle) {
// IE
return el.currentStyle[p];
} else if (window.getComputedStyle) {
// Sa, FF, Opera
var view = el.ownerDocument.defaultView;
return view.getComputedStyle(el,null).getPropertyValue(p);
} else {
// fall back for non IE, Sa, FF, Opera
return "";
}
} catch (e) {
return "";
}
}-*/;
/**
* Will (attempt) to focus the given DOM Element.
*
* @param el
* the element to focus
*/
public static native void focus(Element el)
/*-{
try {
el.focus();
} catch (e) {
}
}-*/;
/**
* Helper method to find first instance of given Widget type found by
* traversing DOM upwards from given element.
*
* Note: If {@code element} is inside some widget {@code W}
* , and {@code W} in turn is wrapped in a {@link Composite}
* {@code C}, this method will not find {@code W}. It returns either
* {@code C} or null, depending on whether the class parameter matches. This
* may also be the case with other Composite-like classes that hijack the
* event handling of their child widget(s).
*
* @param element
* the element where to start seeking of Widget
* @param class1
* the Widget type to seek for
*/
@SuppressWarnings("unchecked")
public static T findWidget(Element element,
Class class1) {
if (element != null) {
/* First seek for the first EventListener (~Widget) from dom */
EventListener eventListener = null;
while (eventListener == null && element != null) {
eventListener = Event.getEventListener(element);
if (eventListener == null) {
element = element.getParentElement();
}
}
if (eventListener instanceof Widget) {
/*
* Then find the first widget of type class1 from widget
* hierarchy
*/
Widget w = (Widget) eventListener;
while (w != null) {
if (class1 == null || w.getClass() == class1) {
return (T) w;
}
w = w.getParent();
}
}
}
return null;
}
/**
* Force webkit to redraw an element
*
* @param element
* The element that should be redrawn
*/
public static void forceWebkitRedraw(Element element) {
Style style = element.getStyle();
String s = style.getProperty("webkitTransform");
if (s == null || s.length() == 0) {
style.setProperty("webkitTransform", "scale(1)");
} else {
style.setProperty("webkitTransform", "");
}
}
/**
* Performs a hack to trigger a re-layout in the IE8. This is usually
* necessary in cases where IE8 "forgets" to update child elements when they
* resize.
*
* @param e
* The element to perform the hack on
*/
public static final void forceIE8Redraw(Element e) {
if (BrowserInfo.get().isIE8()) {
forceIERedraw(e);
}
}
/**
* Performs a hack to trigger a re-layout in the IE browser. This is usually
* necessary in cases where IE "forgets" to update child elements when they
* resize.
*
* @since 7.3
* @param e
* The element to perform the hack on
*/
public static void forceIERedraw(Element e) {
if (BrowserInfo.get().isIE()) {
setStyleTemporarily(e, "zoom", "1");
}
}
/**
* 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.
*
* @param element
* The element to detach and re-attach
*/
public static void detachAttach(Element element) {
if (element == null) {
return;
}
Node nextSibling = element.getNextSibling();
Node parent = element.getParentNode();
if (parent == null) {
return;
}
parent.removeChild(element);
if (nextSibling == null) {
parent.appendChild(element);
} else {
parent.insertBefore(element, nextSibling);
}
}
public static void sinkOnloadForImages(Element element) {
NodeList imgElements = element
.getElementsByTagName("img");
for (int i = 0; i < imgElements.getLength(); i++) {
DOM.sinkEvents(imgElements.getItem(i), Event.ONLOAD);
}
}
/**
* Returns the index of the childElement within its parent.
*
* @param subElement
* @return
*/
public static int getChildElementIndex(Element childElement) {
int idx = 0;
Node n = childElement;
while ((n = n.getPreviousSibling()) != null) {
idx++;
}
return idx;
}
/**
* Temporarily sets the {@code styleProperty} to {@code tempValue} and then
* resets it to its current value. Used mainly to work around rendering
* issues in IE (and possibly in other browsers)
*
* @param element
* The target element
* @param styleProperty
* The name of the property to set
* @param tempValue
* The temporary value
*/
public static void setStyleTemporarily(Element element,
final String styleProperty, String tempValue) {
final Style style = element.getStyle();
final String currentValue = style.getProperty(styleProperty);
style.setProperty(styleProperty, tempValue);
element.getOffsetWidth();
style.setProperty(styleProperty, currentValue);
}
/**
* 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.
*
* @param event
* @return
*/
public static int getTouchOrMouseClientX(Event event) {
if (isTouchEvent(event)) {
return event.getChangedTouches().get(0).getClientX();
} else {
return event.getClientX();
}
}
/**
* 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.
*
* @param event
* the mouse event to get coordinates from
* @return the element at the coordinates of the event
*/
public static Element getElementUnderMouse(NativeEvent event) {
int pageX = getTouchOrMouseClientX(event);
int pageY = getTouchOrMouseClientY(event);
return getElementFromPoint(pageX, pageY);
}
/**
* 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.
*
* @param event
* @return
*/
public static int getTouchOrMouseClientY(Event event) {
if (isTouchEvent(event)) {
return event.getChangedTouches().get(0).getClientY();
} else {
return event.getClientY();
}
}
/**
*
* @see #getTouchOrMouseClientY(Event)
* @param currentGwtEvent
* @return
*/
public static int getTouchOrMouseClientY(NativeEvent currentGwtEvent) {
return getTouchOrMouseClientY(Event.as(currentGwtEvent));
}
/**
* @see #getTouchOrMouseClientX(Event)
*
* @param event
* @return
*/
public static int getTouchOrMouseClientX(NativeEvent event) {
return getTouchOrMouseClientX(Event.as(event));
}
public static boolean isTouchEvent(Event event) {
return event.getType().contains("touch");
}
public static boolean isTouchEvent(NativeEvent event) {
return isTouchEvent(Event.as(event));
}
public static void simulateClickFromTouchEvent(Event touchevent,
Widget widget) {
Touch touch = touchevent.getChangedTouches().get(0);
final NativeEvent createMouseUpEvent = Document.get()
.createMouseUpEvent(0, touch.getScreenX(), touch.getScreenY(),
touch.getClientX(), touch.getClientY(), false, false,
false, false, NativeEvent.BUTTON_LEFT);
final NativeEvent createMouseDownEvent = Document.get()
.createMouseDownEvent(0, touch.getScreenX(),
touch.getScreenY(), touch.getClientX(),
touch.getClientY(), false, false, false, false,
NativeEvent.BUTTON_LEFT);
final NativeEvent createMouseClickEvent = Document.get()
.createClickEvent(0, touch.getScreenX(), touch.getScreenY(),
touch.getClientX(), touch.getClientY(), false, false,
false, false);
/*
* Get target with element from point as we want the actual element, not
* the one that sunk the event.
*/
final Element target = getElementFromPoint(touch.getClientX(),
touch.getClientY());
/*
* Fixes infocusable form fields in Safari of iOS 5.x and some Android
* browsers.
*/
Widget targetWidget = findWidget(target, null);
if (targetWidget instanceof com.google.gwt.user.client.ui.Focusable) {
final com.google.gwt.user.client.ui.Focusable toBeFocusedWidget = (com.google.gwt.user.client.ui.Focusable) targetWidget;
toBeFocusedWidget.setFocus(true);
} else if (targetWidget instanceof Focusable) {
((Focusable) targetWidget).focus();
}
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
@Override
public void execute() {
try {
target.dispatchEvent(createMouseDownEvent);
target.dispatchEvent(createMouseUpEvent);
target.dispatchEvent(createMouseClickEvent);
} catch (Exception e) {
}
}
});
}
/**
* Gets the currently focused element.
*
* @return The active element or null if no active element could be found.
*/
public native static Element getFocusedElement()
/*-{
if ($wnd.document.activeElement) {
return $wnd.document.activeElement;
}
return null;
}-*/;
/**
* Gets currently focused element and checks if it's editable
*
* @since 7.4
*
* @return true if focused element is editable
*/
public static boolean isFocusedElementEditable() {
Element focusedElement = WidgetUtil.getFocusedElement();
if (focusedElement != null) {
String tagName = focusedElement.getTagName();
String contenteditable = focusedElement
.getAttribute("contenteditable");
return "textarea".equalsIgnoreCase(tagName)
|| "input".equalsIgnoreCase(tagName)
|| "true".equalsIgnoreCase(contenteditable);
}
return false;
}
/**
* 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.
*
* @param widget
* @return true if attached and displayed
*/
public static boolean isAttachedAndDisplayed(Widget widget) {
if (widget.isAttached()) {
/*
* Failfast using offset size, then by iterating the widget tree
*/
boolean notZeroSized = widget.getOffsetHeight() > 0
|| widget.getOffsetWidth() > 0;
return notZeroSized || checkVisibilityRecursively(widget);
} else {
return false;
}
}
private static boolean checkVisibilityRecursively(Widget widget) {
if (widget.isVisible()) {
Widget parent = widget.getParent();
if (parent == null) {
return true; // root panel
} else {
return checkVisibilityRecursively(parent);
}
} else {
return false;
}
}
/**
* Scrolls an element into view vertically only. Modified version of
* Element.scrollIntoView.
*
* @param elem
* The element to scroll into view
*/
public static native void scrollIntoViewVertically(Element elem)
/*-{
var top = elem.offsetTop;
var height = elem.offsetHeight;
if (elem.parentNode != elem.offsetParent) {
top -= elem.parentNode.offsetTop;
}
var cur = elem.parentNode;
while (cur && (cur.nodeType == 1)) {
if (top < cur.scrollTop) {
cur.scrollTop = top;
}
if (top + height > cur.scrollTop + cur.clientHeight) {
cur.scrollTop = (top + height) - cur.clientHeight;
}
var offsetTop = cur.offsetTop;
if (cur.parentNode != cur.offsetParent) {
offsetTop -= cur.parentNode.offsetTop;
}
top += offsetTop - cur.scrollTop;
cur = cur.parentNode;
}
}-*/;
/**
* Checks if the given event is either a touch event or caused by the left
* mouse button
*
* @param event
* @return true if the event is a touch event or caused by the left mouse
* button, false otherwise
*/
public static boolean isTouchEventOrLeftMouseButton(Event event) {
boolean touchEvent = WidgetUtil.isTouchEvent(event);
return touchEvent || event.getButton() == Event.BUTTON_LEFT;
}
/**
* Resolve a relative URL to an absolute URL based on the current document's
* location.
*
* @param url
* a string with the relative URL to resolve
* @return the corresponding absolute URL as a string
*/
public static String getAbsoluteUrl(String url) {
if (BrowserInfo.get().isIE8()) {
// The hard way - must use innerHTML and attach to DOM in IE8
DivElement divElement = Document.get().createDivElement();
divElement.getStyle().setDisplay(Display.NONE);
RootPanel.getBodyElement().appendChild(divElement);
divElement.setInnerHTML("");
AnchorElement a = divElement.getChild(0).cast();
String href = a.getHref();
RootPanel.getBodyElement().removeChild(divElement);
return href;
} else {
AnchorElement a = Document.get().createAnchorElement();
a.setHref(url);
return a.getHref();
}
}
/**
* Sets the selection range of an input element.
*
* We need this JSNI function to set selection range so that we can use the
* optional direction attribute to set the anchor to the end and the focus
* to the start. This makes Firefox work the same way as other browsers
* (#13477)
*
* @param elem
* the html input element.
* @param pos
* the index of the first selected character.
* @param length
* the selection length.
* @param direction
* a string indicating the direction in which the selection was
* performed. This may be "forward" or "backward", or "none" if
* the direction is unknown or irrelevant.
*
* @since 7.3
*/
public native static void setSelectionRange(Element elem, int pos,
int length, String direction)
/*-{
try {
elem.setSelectionRange(pos, pos + length, direction);
} catch (e) {
// Firefox throws exception if TextBox is not visible, even if attached
}
}-*/;
/**
* The allowed value inaccuracy when comparing two double-typed pixel
* values.
*
* Since we're comparing pixels on a screen, epsilon must be less than 1.
* 0.49 was deemed a perfectly fine and beautifully round number.
*/
public static final double PIXEL_EPSILON = 0.49d;
/**
* Compares two double values with the error margin of
* {@link #PIXEL_EPSILON} (i.e. {@value #PIXEL_EPSILON})
*
* @param num1
* the first value for which to compare equality
* @param num2
* the second value for which to compare equality
* @since 7.4
*
* @return true if the values are considered equals; false otherwise
*/
public static boolean pixelValuesEqual(final double num1, final double num2) {
return Math.abs(num1 - num2) <= PIXEL_EPSILON;
}
public static native TextRectangle getBoundingClientRect(Element e)
/*-{
return e.getBoundingClientRect();
}-*/;
public static final class TextRectangle extends JavaScriptObject {
protected TextRectangle() {
}
public native double getBottom()
/*-{
return this.bottom;
}-*/;
public native double getHeight()
/*-{
return this.height;
}-*/;
public native double getLeft()
/*-{
return this.left;
}-*/;
public native double getRight()
/*-{
return this.right;
}-*/;
public native double getTop()
/*-{
return this.top;
}-*/;
public native double getWidth()
/*-{
return this.width;
}-*/;
}
/**
* Wrap a css size value and its unit and translate back and forth to the
* string representation.
* Eg. 50%, 123px, ...
*
* @since 7.2.6
* @author Vaadin Ltd
*/
@SuppressWarnings("serial")
public static class CssSize implements Serializable {
/*
* Map the size units with their type.
*/
private static Map type2Unit = new HashMap();
static {
for (Unit unit : Unit.values()) {
type2Unit.put(unit.getType(), unit);
}
}
/**
* Gets the unit value by its type.
*
* @param type
* the type of the unit as found in the style.
* @return the unit value.
*/
public static Unit unitByType(String type) {
return type2Unit.get(type);
}
/*
* Regex to parse the size.
*/
private static final RegExp sizePattern = RegExp
.compile(SharedUtil.SIZE_PATTERN);
/**
* Parse the size from string format to {@link CssSize}.
*
* @param s
* the size as string.
* @return a {@link CssSize} object.
*/
public static CssSize fromString(String s) {
if (s == null) {
return null;
}
s = s.trim();
if ("".equals(s)) {
return null;
}
float size = 0;
Unit unit = null;
MatchResult matcher = sizePattern.exec(s);
if (matcher.getGroupCount() > 1) {
size = Float.parseFloat(matcher.getGroup(1));
if (size < 0) {
size = -1;
unit = Unit.PX;
} else {
String symbol = matcher.getGroup(2);
unit = unitByType(symbol);
}
} else {
throw new IllegalArgumentException("Invalid size argument: \""
+ s + "\" (should match " + sizePattern.getSource()
+ ")");
}
return new CssSize(size, unit);
}
/**
* Creates a {@link CssSize} using a value and its measurement unit.
*
* @param value
* the value.
* @param unit
* the unit.
* @return the {@link CssSize} object.
*/
public static CssSize fromValueUnit(float value, Unit unit) {
return new CssSize(value, unit);
}
/*
* The value.
*/
private final float value;
/*
* The measure unit.
*/
private final Unit unit;
private CssSize(float value, Unit unit) {
this.value = value;
this.unit = unit;
}
/**
* Gets the value for this css size.
*
* @return the value.
*/
public float getValue() {
return value;
}
/**
* Gets the measurement unit for this css size.
*
* @return the unit.
*/
public Unit getUnit() {
return unit;
}
@Override
public String toString() {
return value + unit.getType();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof CssSize) {
CssSize size = (CssSize) obj;
return size.value == value && size.unit == unit;
}
return false;
}
/**
* Check whether the two sizes are equals.
*
* @param cssSize1
* the first size to compare.
* @param cssSize2
* the other size to compare with the first one.
* @return true if the two sizes are equals, otherwise false.
*/
public static boolean equals(String cssSize1, String cssSize2) {
return CssSize.fromString(cssSize1).equals(
CssSize.fromString(cssSize2));
}
}
private static Logger getLogger() {
return Logger.getLogger(WidgetUtil.class.getName());
}
}