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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;
- }-*/;
-
- /**
- * Redirects the browser to the given url or refreshes the page if url is
- * null
- *
- * @since 7.6
- * @param url
- * The url to redirect to or null to refresh
- */
- public static native void redirect(String url)
- /*-{
- if (url) {
- $wnd.location = url;
- } else {
- $wnd.location.reload(false);
- }
- }-*/;
-
- /**
- * 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 "<br>" 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 <literal>attribute</literal>.
- */
- 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;
- private static int detectedSubPixelRoundingFactor = -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 width for the given element, i.e. element width +
- * border + padding.
- *
- * @param element
- * The element to check
- * @return The border-box width for the element
- */
- public static double getRequiredWidthDouble(
- com.google.gwt.dom.client.Element element) {
- double reqWidth = getRequiredWidthBoundingClientRectDouble(element);
- if (BrowserInfo.get().isIE() && !BrowserInfo.get().isIE8()) {
- double csWidth = getRequiredWidthComputedStyleDouble(element);
- if (csWidth > reqWidth && csWidth <= (reqWidth + 1)) {
- // IE9 rounds reqHeight to integers BUT sometimes reports wrong
- // csHeight it seems, so we only use csHeight if it is within a
- // rounding error
-
- return csWidth;
- }
- }
- 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;
- }
-
- /**
- * Gets the border-box height for the given element, i.e. element height +
- * border + padding.
- *
- * @param element
- * The element to check
- * @return The border-box height for the element
- */
- public static double getRequiredHeightDouble(
- com.google.gwt.dom.client.Element element) {
- double reqHeight = getRequiredHeightBoundingClientRectDouble(element);
- if (BrowserInfo.get().isIE() && !BrowserInfo.get().isIE8()) {
- double csHeight = getRequiredHeightComputedStyleDouble(element);
- if (csHeight > reqHeight && csHeight <= (reqHeight + 1)) {
- // IE9 rounds reqHeight to integers BUT sometimes reports wrong
- // csHeight it seems, so we only use csHeight if it is within a
- // rounding error
-
- // Although sometimes it also happens that IE9 returns an
- // incorrectly rounded down requiredHeight and a computed height
- // which is exactly one larger, hence the "<="...
- return csHeight;
- }
- }
- return reqHeight;
- }
-
- /**
- * Calculates the width of the element's bounding rectangle.
- * <p>
- * 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.
- * <p>
- * 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 int getRequiredHeightComputedStyle(
- com.google.gwt.dom.client.Element element) {
- return (int) Math.ceil(getRequiredHeightComputedStyleDouble(element));
- }
-
- public static native double getRequiredHeightComputedStyleDouble(
- com.google.gwt.dom.client.Element element)
- /*-{
- var cs = element.ownerDocument.defaultView.getComputedStyle(element);
- var heightPx = cs.height;
- if(heightPx == 'auto'){
- // Fallback for inline elements
- return @com.vaadin.client.WidgetUtil::getRequiredHeightBoundingClientRectDouble(Lcom/google/gwt/dom/client/Element;)(element);
- }
- var height = parseFloat(heightPx); // Will automatically skip "px" suffix
- var border = parseFloat(cs.borderTopWidth) + parseFloat(cs.borderBottomWidth); // Will automatically skip "px" suffix
- var padding = parseFloat(cs.paddingTop) + parseFloat(cs.paddingBottom); // Will automatically skip "px" suffix
- return height+border+padding;
- }-*/;
-
- public static int getRequiredWidthComputedStyle(
- com.google.gwt.dom.client.Element element) {
- return (int) Math.ceil(getRequiredWidthComputedStyleDouble(element));
- }
-
- public static native int getRequiredWidthComputedStyleDouble(
- com.google.gwt.dom.client.Element element)
- /*-{
- var cs = element.ownerDocument.defaultView.getComputedStyle(element);
- var widthPx = cs.width;
- if(widthPx == 'auto'){
- // Fallback for inline elements
- return @com.vaadin.client.WidgetUtil::getRequiredWidthBoundingClientRectDouble(Lcom/google/gwt/dom/client/Element;)(element);
- }
- var width = parseFloat(widthPx); // Will automatically skip "px" suffix
- var border = parseFloat(cs.borderLeftWidth) + parseFloat(cs.borderRightWidth); // Will automatically skip "px" suffix
- var padding = parseFloat(cs.paddingLeft) + parseFloat(cs.paddingRight); // Will automatically skip "px" suffix
- return width+border+padding;
- }-*/;
-
- /**
- * Calculates the height of the element's bounding rectangle.
- * <p>
- * 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.
- * <p>
- * 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.
- * <p>
- * <strong>Note:</strong> If {@code element} is inside some widget {@code W}
- * , <em>and</em> {@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> T findWidget(Element element,
- Class<? extends Widget> 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<com.google.gwt.dom.client.Element> 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("<a href='" + escapeAttribute(url)
- + "' ></a>");
-
- 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.
- * <p>
- * 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.<br/>
- * 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<String, Unit> type2Unit = new HashMap<String, Style.Unit>();
- 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());
- }
-
- /**
- * Returns the thickness of the given element's top border.
- * <p>
- * The value is determined using computed style when available and
- * calculated otherwise.
- *
- * @since 7.5.0
- * @param element
- * the element to measure
- * @return the top border thickness
- */
- public static double getBorderTopThickness(Element element) {
- return getBorderThickness(element, new String[] { "borderTopWidth" });
- }
-
- /**
- * Returns the thickness of the given element's bottom border.
- * <p>
- * The value is determined using computed style when available and
- * calculated otherwise.
- *
- * @since 7.5.0
- * @param element
- * the element to measure
- * @return the bottom border thickness
- */
- public static double getBorderBottomThickness(Element element) {
- return getBorderThickness(element, new String[] { "borderBottomWidth" });
- }
-
- /**
- * Returns the combined thickness of the given element's top and bottom
- * borders.
- * <p>
- * The value is determined using computed style when available and
- * calculated otherwise.
- *
- * @since 7.5.0
- * @param element
- * the element to measure
- * @return the top and bottom border thickness
- */
- public static double getBorderTopAndBottomThickness(Element element) {
- return getBorderThickness(element, new String[] { "borderTopWidth",
- "borderBottomWidth" });
- }
-
- /**
- * Returns the thickness of the given element's left border.
- * <p>
- * The value is determined using computed style when available and
- * calculated otherwise.
- *
- * @since 7.5.0
- * @param element
- * the element to measure
- * @return the left border thickness
- */
- public static double getBorderLeftThickness(Element element) {
- return getBorderThickness(element, new String[] { "borderLeftWidth" });
- }
-
- /**
- * Returns the thickness of the given element's right border.
- * <p>
- * The value is determined using computed style when available and
- * calculated otherwise.
- *
- * @since 7.5.0
- * @param element
- * the element to measure
- * @return the right border thickness
- */
- public static double getBorderRightThickness(Element element) {
- return getBorderThickness(element, new String[] { "borderRightWidth" });
- }
-
- /**
- * Returns the thickness of the given element's left and right borders.
- * <p>
- * The value is determined using computed style when available and
- * calculated otherwise.
- *
- * @since 7.5.0
- * @param element
- * the element to measure
- * @return the top border thickness
- */
- public static double getBorderLeftAndRightThickness(Element element) {
- return getBorderThickness(element, new String[] { "borderLeftWidth",
- "borderRightWidth" });
- }
-
- private static native double getBorderThickness(
- com.google.gwt.dom.client.Element element, String[] borderNames)
- /*-{
- if (typeof $wnd.getComputedStyle === 'function') {
- var computedStyle = $wnd.getComputedStyle(element);
- var width = 0;
- for (i=0; i< borderNames.length; i++) {
- var borderWidth = computedStyle[borderNames[i]];
- width += parseFloat(borderWidth);
- }
- return width;
- } else {
- var parentElement = element.offsetParent;
- var cloneElement = element.cloneNode(false);
- cloneElement.style.boxSizing ="content-box";
- parentElement.appendChild(cloneElement);
- cloneElement.style.height = "10px"; // IE8 wants the height to be set to something...
- var heightWithBorder = cloneElement.offsetHeight;
- for (i=0; i< borderNames.length; i++) {
- cloneElement.style[borderNames[i]] = "0";
- }
- var heightWithoutBorder = cloneElement.offsetHeight;
- parentElement.removeChild(cloneElement);
-
- return heightWithBorder - heightWithoutBorder;
- }
- }-*/;
-
- /**
- * Rounds the given size up to a value which the browser will accept.
- *
- * Safari/WebKit uses 1/64th of a pixel to enable using integer math
- * (http://trac.webkit.org/wiki/LayoutUnit).
- *
- * Firefox uses 1/60th of a pixel because it is divisible by three
- * (https://bugzilla.mozilla.org/show_bug.cgi?id=1070940)
- *
- * @since 7.5.1
- * @param size
- * the value to round
- * @return the rounded value
- */
- public static double roundSizeUp(double size) {
- return roundSize(size, true);
- }
-
- /**
- * Rounds the given size down to a value which the browser will accept.
- *
- * Safari/WebKit uses 1/64th of a pixel to enable using integer math
- * (http://trac.webkit.org/wiki/LayoutUnit).
- *
- * Firefox uses 1/60th of a pixel because it is divisible by three
- * (https://bugzilla.mozilla.org/show_bug.cgi?id=1070940)
- *
- * IE9+ uses 1/100th of a pixel
- *
- * @since 7.5.1
- * @param size
- * the value to round
- * @return the rounded value
- */
- public static double roundSizeDown(double size) {
- return roundSize(size, false);
- }
-
- private static double roundSize(double size, boolean roundUp) {
- if (BrowserInfo.get().isIE8()) {
- if (roundUp) {
- return Math.ceil(size);
- } else {
- return (int) size;
- }
- }
-
- double factor = getSubPixelRoundingFactor();
- if (factor < 0 || size < 0) {
- return size;
- }
-
- if (roundUp) {
- return roundSizeUp(size, factor);
- } else {
- return roundSizeDown(size, factor);
- }
- }
-
- /**
- * Returns the factor used by browsers to round subpixel values
- *
- * @since 7.5.1
- * @return the factor N used by the browser when storing subpixels as X+Y/N
- */
- private static double getSubPixelRoundingFactor() {
- // Detects how the browser does subpixel rounding
- // Currently Firefox uses 1/60th pixels
- // and Safari uses 1/64th pixels
- // IE 1/100th pixels
- if (detectedSubPixelRoundingFactor != -1) {
- return detectedSubPixelRoundingFactor;
- }
-
- double probeSize = 0.999999;
- DivElement div = Document.get().createDivElement();
- Document.get().getBody().appendChild(div);
- div.getStyle().setHeight(probeSize, Unit.PX);
- ComputedStyle computedStyle = new ComputedStyle(div);
- double computedHeight = computedStyle.getHeight();
-
- if (computedHeight < probeSize) {
- // Rounded down by browser, all browsers but Firefox do this
- // today
- detectedSubPixelRoundingFactor = (int) Math
- .round(1.0 / (1.0 - computedHeight));
- } else {
- // Rounded up / to nearest by browser
- probeSize = 1;
-
- while (computedStyle.getHeight() != 0.0) {
- computedHeight = computedStyle.getHeight();
- probeSize /= 2.0;
- div.getStyle().setHeight(probeSize, Unit.PX);
- }
-
- detectedSubPixelRoundingFactor = (int) Math
- .round(1.0 / computedHeight);
- }
-
- div.removeFromParent();
- return detectedSubPixelRoundingFactor;
- }
-
- private static double roundSizeUp(double size, double divisor) {
- // In: 12.51, 60.0
-
- // 12
- double integerPart = (int) size;
-
- // (12.51 - 12) * 60 = 30.6
- double nrFractions = (size - integerPart) * divisor;
-
- // 12 + ceil(30.6) / 60 = 12 + 31/60 = 12.51666
- return integerPart + (Math.ceil(nrFractions)) / divisor;
- }
-
- private static double roundSizeDown(double size, double divisor) {
- // In: 12.51, 60.0
-
- // 12
- double integerPart = (int) size;
-
- // (12.51 - 12) * 60 = 30.6
- double nrFractions = (size - integerPart) * divisor;
-
- // 12 + int(30.6) / 60 = 12 + 30/60 = 12.5
- return integerPart + ((int) nrFractions) / divisor;
- }
- }
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