vaadin-framework/src/com/itmill/toolkit/terminal/gwt/client/Caption.java

package com.itmill.toolkit.terminal.gwt.client;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.PopupPanel;

public class Caption extends HTML {

	public static final String CLASSNAME = "i-caption";

	private Paintable owner;

	private Element errorIndicatorElement;

	private Element captionText;

	private ErrorMessage errorMessage;

	private PopupPanel errorContainer;

	/* Caption must be attached to a Paintable */
	private Caption() {
	};

	public Caption(Paintable component) {
		super();
		owner = component;
		setStyleName(CLASSNAME);
	}

	public void updateCaption(UIDL uidl) {
		setVisible(!uidl.getBooleanAttribute("invisible"));

		if (uidl.hasAttribute("error")) {
			UIDL errorUidl = uidl.getErrors();

			if (errorIndicatorElement == null) {
				errorIndicatorElement = DOM.createDiv();
				DOM.setElementProperty(errorIndicatorElement, "className",
						"i-errorindicator");
				DOM.insertChild(getElement(), errorIndicatorElement, 0);
			}
			if (errorMessage == null)
				errorMessage = new ErrorMessage();
			errorMessage.updateFromUIDL(errorUidl);

		} else if (errorIndicatorElement != null) {
			DOM.setStyleAttribute(errorIndicatorElement, "display", "none");
		}

		if (uidl.hasAttribute("caption")) {
			if (captionText == null) {
				captionText = DOM.createSpan();
				DOM.appendChild(getElement(), captionText);
			}
			DOM.setInnerText(captionText, uidl.getStringAttribute("caption"));
		}

		if (uidl.hasAttribute("description")) {
			if (captionText != null) {
				DOM.setElementProperty(captionText, "title", uidl
						.getStringAttribute("description"));
			} else {
				setTitle(uidl.getStringAttribute("description"));
			}
		}

	}

	public void onBrowserEvent(Event event) {
		Element target = DOM.eventGetTarget(event);
		if (errorIndicatorElement != null
				&& DOM.compare(target, errorIndicatorElement)) {
			switch (DOM.eventGetType(event)) {
			case Event.ONMOUSEOVER:
				showErrorMessage();
				break;
			case Event.ONMOUSEOUT:
				hideErrorMessage();
				break;
			case Event.ONCLICK:
				ApplicationConnection.getConsole().log(
						DOM.getInnerHTML(errorMessage.getElement()));
			default:
				break;
			}
		}
	}

	private void hideErrorMessage() {
		if (errorContainer != null) {
			errorContainer.hide();
		}
	}

	private void showErrorMessage() {
		if (errorMessage != null) {
			if (errorContainer == null) {
				errorContainer = new PopupPanel();
				errorContainer.setWidget(errorMessage);
			}
			errorContainer.setPopupPosition(DOM
					.getAbsoluteLeft(errorIndicatorElement)
					+ 2
					* DOM.getElementPropertyInt(errorIndicatorElement,
							"offsetHeight"), DOM
					.getAbsoluteTop(errorIndicatorElement)
					+ 2
					* DOM.getElementPropertyInt(errorIndicatorElement,
							"offsetHeight"));
			errorContainer.show();
		}
	}

	public static boolean isNeeded(UIDL uidl) {
		if (uidl.getStringAttribute("caption") != null)
			return true;
		if (uidl.hasAttribute("error"))
			return true;

		// TODO Description ??

		return false;
	}

	/**
	 * Returns Paintable for which this Caption belongs to.
	 * 
	 * @return owner Widget
	 */
	public Paintable getOwner() {
		return owner;
	}
}