package com.temp.client.foundation.util;

import com.google.gwt.user.client.ui.HasEnabled;

/**
 * The purpose of this class is to manage the "Enabled" State of a a bunch of
 * objects that implement "HasEnabled" (usually UI Widgets, specifically
 * Buttons, and Input, which share this interface, but do not have a common
 * super class that has "setEnabled(boolean)"). It is planned to be used for
 * disabling a bunch of widgets when the data is being collected from the
 * Server.
 *
 * This class, when disable is requested, snags the current Enabled State of all
 * the Objects, and will then restore this state when enable is requested.
 *
 * @author georgs
 */
public class HasEnabledSetManager {
    private final HasEnabled[] enableManageables;
    private boolean[] snaggedState;

    public HasEnabledSetManager(HasEnabled... enableManageables) {
        this.enableManageables = enableManageables;
    }

    public void snagStateAndDisable() {
        snagStateAndSetState(false);
    }

    public void snagStateAndEnable() {
        snagStateAndSetState(true);
    }

    public boolean restoreState() {
        if (snaggedState == null) {
            return false;
        }
        for (int i = 0; i < enableManageables.length; i++) {
            enableManageables[i].setEnabled(snaggedState[i]);
        }
        return true;
    }

    private void snagStateAndSetState(boolean enable) {
        snaggedState = new boolean[enableManageables.length];
        for (int i = 0; i < enableManageables.length; i++) {
            HasEnabled enableManageable = enableManageables[i];
            snaggedState[i] = enableManageable.isEnabled();
            enableManageable.setEnabled(enable);
        }
    }
}