PopupCell.java

/**
 * Copyright (C) 2015 Born Informatik AG (www.born.ch)
 *
 * 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 org.wte4j.ui.client.cell;

import java.util.HashSet;
import java.util.Set;

import com.google.gwt.cell.client.Cell;
import com.google.gwt.cell.client.ValueUpdater;
import com.google.gwt.dom.client.BrowserEvents;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.EventTarget;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.PopupPanel.PositionCallback;

public class PopupCell<T> implements Cell<T> {

	private Cell<T> contentCell;
	private PopupPanel popupPanel;
	private Set<String> consumedEvents;

	public PopupCell(PopupPanel popupPanel, Cell<T> contentCell) {
		this.contentCell = contentCell;
		this.popupPanel = popupPanel;

		consumedEvents = new HashSet<String>();
		if (contentCell.getConsumedEvents() != null) {
			consumedEvents.addAll(contentCell.getConsumedEvents());
		}
		consumedEvents.add(BrowserEvents.CLICK);

	}

	@Override
	public void render(Context context, T value, SafeHtmlBuilder sb) {
		contentCell.render(context, value, sb);
	}

	@Override
	public void onBrowserEvent(Cell.Context context, Element parent, T value,
			NativeEvent event, ValueUpdater<T> valueUpdater) {
		contentCell.onBrowserEvent(context, parent, value, event, valueUpdater);
		EventTarget eventTarget = event.getEventTarget();
		if (!BrowserEvents.CLICK.equals(event.getType())) {
			return;
		}
		final Element domElement = Element.as(eventTarget);
		popupPanel.setPopupPositionAndShow(new PositionCallback() {
			@Override
			public void setPosition(int offsetWidth, int offsetHeight) {

				int positionLeft = domElement.getAbsoluteLeft();
				int outerleft = domElement.getAbsoluteLeft() + popupPanel.getOffsetWidth();
				if (outerleft > Window.getClientWidth()) {
					positionLeft = domElement.getAbsoluteLeft() - popupPanel.getOffsetWidth() + domElement.getOffsetWidth();
				}

				int positionTop = domElement.getAbsoluteTop();
				int outerTop = domElement.getAbsoluteTop() + popupPanel.getOffsetWidth();
				if (outerTop > Window.getClientHeight()) {
					positionTop = domElement.getAbsoluteTop() - popupPanel.getOffsetHeight() + domElement.getOffsetHeight();
				}
				popupPanel.setPopupPosition(positionLeft, positionTop);
			}
		});
	}

	public boolean dependsOnSelection() {
		return contentCell.dependsOnSelection();
	}

	public Set<String> getConsumedEvents() {
		return consumedEvents;
	}

	public boolean handlesSelection() {
		return contentCell.handlesSelection();
	}

	public boolean isEditing(com.google.gwt.cell.client.Cell.Context context,
			Element parent, T value) {
		return contentCell.isEditing(context, parent, value);
	}

	public boolean resetFocus(com.google.gwt.cell.client.Cell.Context context,
			Element parent, T value) {
		return contentCell.resetFocus(context, parent, value);
	}

	public void setValue(com.google.gwt.cell.client.Cell.Context context,
			Element parent, T value) {
		contentCell.setValue(context, parent, value);
	}
}