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

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

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.ClickListener;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.Button;
import com.itmill.toolkit.terminal.gwt.client.ApplicationConnection;
import com.itmill.toolkit.terminal.gwt.client.ErrorMessage;
import com.itmill.toolkit.terminal.gwt.client.Paintable;
import com.itmill.toolkit.terminal.gwt.client.UIDL;

public class IButton extends Button implements Paintable {

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

	String id;

	ApplicationConnection client;

	private Element errorIndicatorElement;

	private ErrorMessage errorMessage;

	private PopupPanel errorContainer;

	public IButton() {
		setStyleName(CLASSNAME);
		addClickListener(new ClickListener() {

			public void onClick(Widget sender) {
				if (id == null || client == null)
					return;
				client.updateVariable(id, "state", true, true);
			}
		});
	}

	public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {

		// Ensure correct implementation,
		// but don't let container manage caption etc.
		if (client.updateComponent(this, uidl, false))
			return;

		// Save details
		this.client = client;
		id = uidl.getId();

		// Set text
		setText(uidl.getStringAttribute("caption"));

		if (uidl.hasAttribute("error")) {
			UIDL errorUidl = uidl.getErrors();
			if (errorIndicatorElement == null) {
				errorIndicatorElement = DOM.createDiv();
				DOM.setElementProperty(errorIndicatorElement, "className",
						"i-errorindicator");
				DOM.sinkEvents(errorIndicatorElement, Event.MOUSEEVENTS);
			}
			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("description")) {
			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()));
				return;
			default:
				break;
			}
		}
		super.onBrowserEvent(event);
	}

	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();
		}
	}

}