uicontext.java

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package com.vp.echeckregister.ui.library;

import java.util.Stack;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;

public class UIContext {
	private static Stack uiStack = new Stack();
	private MIDlet appMidlet;
	private Display display;

	public UIContext(MIDlet midlet) {
		this.appMidlet = midlet;
		this.display = Display.getDisplay(appMidlet);
	}

	public void setCurrent(Displayable dis, boolean bPushStack) {
		display.setCurrent(dis);
		if (bPushStack) {
			uiStack.push(dis);
		}
	}

	public void back() {
		if (uiStack.size() >= 2) {
			uiStack.pop();
			setCurrent((Displayable) uiStack.peek(), false);
		}
	}

	public void backTo(Object dis) {
		if (uiStack.search(dis) != -1) {
			Object popObj;
			do {
				popObj = uiStack.pop();
			} while (!popObj.equals(dis));
			setCurrent((Displayable) popObj, true);
		}
	}

	public void showAlert(Alert alert) {
		display.setCurrent(alert);
	}
}