- /*
- * 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.util.HashMap;
- import java.util.Iterator;
- import java.util.Map;
-
- import com.google.gwt.dom.client.Document;
- import com.google.gwt.dom.client.Element;
- import com.google.gwt.dom.client.Node;
- import com.google.gwt.user.client.ui.RootPanel;
-
- /**
- * Alternative MeasuredSize storage for IE8. Storing any information in a DOM
- * element in IE8 seems to make the browser think the element has changed in a
- * way that requires a reflow. To work around that, the MeasureData is instead
- * stored in Map for IE8.
- *
- * This implementation is injected for IE8 by a replace-with definition in the
- * GWT module.
- *
- * @author Vaadin Ltd
- * @since 7.0.0
- */
- public class LayoutManagerIE8 extends LayoutManager {
-
- private Map<Element, MeasuredSize> measuredSizes = new HashMap<Element, MeasuredSize>();
-
- // this method is needed to test for memory leaks (see
- // LayoutMemoryUsageIE8ExtensionConnector) but can be private
- private int getMeasuredSizesMapSize() {
- return measuredSizes.size();
- }
-
- @Override
- protected void setMeasuredSize(Element element, MeasuredSize measuredSize) {
- if (measuredSize != null) {
- measuredSizes.put(element, measuredSize);
- } else {
- measuredSizes.remove(element);
- }
- }
-
- @Override
- protected MeasuredSize getMeasuredSize(Element element,
- MeasuredSize defaultSize) {
- MeasuredSize measured = measuredSizes.get(element);
- if (measured != null) {
- return measured;
- } else {
- return defaultSize;
- }
- }
-
- @Override
- protected void cleanMeasuredSizes() {
- Profiler.enter("LayoutManager.cleanMeasuredSizes");
-
- // #12688: IE8 was leaking memory when adding&removing components.
- // Uses IE specific logic to figure if an element has been removed from
- // DOM or not. For removed elements the measured size is discarded.
- Node rootNode = Document.get().getBody();
-
- Iterator<Element> i = measuredSizes.keySet().iterator();
- while (i.hasNext()) {
- Element e = i.next();
- if (!rootNode.isOrHasChild(e)) {
- i.remove();
- }
- }
-
- Profiler.leave("LayoutManager.cleanMeasuredSizes");
- }
-
- @Override
- protected void performBrowserLayoutHacks() {
- Profiler.enter("LayoutManagerIE8.performBrowserLayoutHacks");
- /*
- * Fixes IE8 issues where IE8 sometimes forgets to update the size of
- * the containing element. To force a reflow by modifying the magical
- * zoom property.
- */
- Util.forceIE8Redraw(RootPanel.get().getElement());
- Profiler.leave("LayoutManagerIE8.performBrowserLayoutHacks");
- }
- }
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