com.calclab.emite.widgets.client.base.ComposedWidget.java Source code

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Here is the source code for com.calclab.emite.widgets.client.base.ComposedWidget.java

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/*
 *
 * ((e)) emite: A pure gwt (Google Web Toolkit) xmpp (jabber) library
 *
 * (c) 2008-2009 The emite development team (see CREDITS for details)
 * This file is part of emite.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.calclab.emite.widgets.client.base;

import java.util.ArrayList;

import com.google.gwt.user.client.ui.StackPanel;
import com.google.gwt.user.client.ui.Widget;

public abstract class ComposedWidget extends StackPanel implements EmiteWidget {
    private int currentWidget;
    protected final EmiteWidget disconnectedWidget;
    protected final EmiteWidget connectedWidget;

    public ComposedWidget(final EmiteWidget disconnectedWidget, final EmiteWidget connectedWidget) {
        this.disconnectedWidget = disconnectedWidget;
        this.connectedWidget = connectedWidget;
        currentWidget = -1;
        add((Widget) disconnectedWidget);
        add((Widget) connectedWidget);
        showDisconnectedWiget();
    }

    public String[] getParamNames() {
        final ArrayList<String> params = new ArrayList<String>();
        collectParams(params, disconnectedWidget.getParamNames());
        collectParams(params, connectedWidget.getParamNames());
        collectParams(params, getExtraParamNames());
        return params.toArray(EmiteWidget.EMPTY_PARAMS);
    }

    public void setParam(final String name, final String value) {
        disconnectedWidget.setParam(name, value);
        connectedWidget.setParam(name, value);
        setExtraParam(name, value);
    }

    public void showConnectedWidget() {
        showWidget(1);
    }

    public void showDisconnectedWiget() {
        showWidget(0);
    }

    protected abstract String[] getExtraParamNames();

    protected abstract void setExtraParam(String name, String value);

    private void collectParams(final ArrayList<String> params, final String[] toCollect) {
        if (toCollect != null) {
            for (final String name : toCollect) {
                params.add(name);
            }
        }
    }

    private void showWidget(final int index) {
        assert index == 0 || index == 1;

        if (currentWidget != index) {
            currentWidget = index;
            showStack(index);
        }
    }

}