com.extjs.gxt.ui.client.widget.form.FormButtonBinding.java Source code

Introduction

Here is the source code for com.extjs.gxt.ui.client.widget.form.FormButtonBinding.java

Source

/*
 * Sencha GXT 2.3.1 - Sencha for GWT
 * Copyright(c) 2007-2013, Sencha, Inc.
 * licensing@sencha.com
 * 
 * http://www.sencha.com/products/gxt/license/
 */
package com.extjs.gxt.ui.client.widget.form;

import java.util.ArrayList;
import java.util.List;

import com.extjs.gxt.ui.client.event.ComponentEvent;
import com.extjs.gxt.ui.client.event.Events;
import com.extjs.gxt.ui.client.event.Listener;
import com.extjs.gxt.ui.client.widget.button.Button;
import com.google.gwt.user.client.Timer;

/**
 * Monitors the valid state of a form and enabled / disabled all buttons.
 */
public class FormButtonBinding {

    private FormPanel panel;
    private Timer timer;
    private int interval = 500;
    private Listener<ComponentEvent> listener;
    private List<Button> buttons;

    public FormButtonBinding(FormPanel panel) {
        this.panel = panel;

        buttons = new ArrayList<Button>();
        timer = new Timer() {
            @Override
            public void run() {
                FormButtonBinding.this.checkPanel();
            }
        };
        listener = new Listener<ComponentEvent>() {
            public void handleEvent(ComponentEvent be) {
                if (be.getType() == Events.Attach) {
                    FormButtonBinding.this.startMonitoring();
                } else if (be.getType() == Events.Detach) {
                    FormButtonBinding.this.stopMonitoring();
                }
            }
        };
        panel.addListener(Events.Attach, listener);
        panel.addListener(Events.Detach, listener);

        if (panel.isAttached()) {
            startMonitoring();
        }

    }

    public void addButton(Button button) {
        buttons.add(button);
    }

    public int getInterval() {
        return interval;
    }

    public void removeButton(Button button) {
        buttons.remove(button);
    }

    public void setInterval(int interval) {
        this.interval = interval;
    }

    public void startMonitoring() {
        if (panel.isAttached()) {
            timer.run();
            timer.scheduleRepeating(interval);
        }
    }

    public void stopMonitoring() {
        timer.cancel();
    }

    protected boolean checkPanel() {
        boolean v = panel.isValid(true);
        for (Button button : buttons) {
            if (v != button.isEnabled()) {
                button.setEnabled(v);
            }
        }
        return v;

    }

}