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

import java.util.Iterator;

import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Widget;

public class Util {

	/**
	 * Helper method for debugging purposes.
	 * 
	 * Stops execution on firefox browsers on a breakpoint.
	 * 
	 */
	public static native void browserDebugger() /*-{
		if(window.console)
			debugger;
	}-*/;

	/**
	 * Detects if current browser is IE.
	 * 
	 * @return true if IE
	 */
	public static native boolean isIE() /*-{
		var browser=$wnd.navigator.appName;
		if (browser=="Microsoft Internet Explorer") {
			return true;
		}
		return false;
	}-*/;

	/**
	 * Nulls oncontextmenu function on given element. We need to manually clear
	 * context menu events due bad browsers memory leaks, since we GWT don't
	 * support them.
	 * 
	 * @param el
	 */
	public native static void removeContextMenuEvent(Element el) /*-{
		el.oncontextmenu = null;
	}-*/;

	/**
	 * Traverses recursively ancestors until ContainerResizedListener child
	 * widget is found. They will delegate it futher if needed.
	 * 
	 * @param container
	 */
	public static void runAnchestorsLayout(HasWidgets container) {
		Iterator childWidgets = container.iterator();
		while (childWidgets.hasNext()) {
			Widget child = (Widget) childWidgets.next();
			if (child instanceof ContainerResizedListener) {
				((ContainerResizedListener) child).iLayout();
			} else if (child instanceof HasWidgets) {
				HasWidgets childContainer = (HasWidgets) child;
				runAnchestorsLayout(childContainer);
			}
		}
	}
}