ilarkesto.gwt.client.AWidget.java Source code

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Here is the source code for ilarkesto.gwt.client.AWidget.java

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/*
 * Copyright 2011 Witoslaw Koczewsi <wi@koczewski.de>, Artjom Kochtchi
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero 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 Affero General Public License
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 */
package ilarkesto.gwt.client;

import ilarkesto.core.base.Str;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;

public abstract class AWidget extends Composite implements Updatable {

    private boolean initializing;
    private boolean initialized;
    private Wrapper wrapper;

    protected abstract Widget onInitialization();

    public AWidget() {
        wrapper = new Wrapper();
        if (!GWT.isScript())
            wrapper.setContent(Gwt.createBugMarker(getClass().getName() + " is not initialized. -> call update()"));
        initWidget(wrapper);
    }

    protected boolean isResetRequired() {
        return false;
    }

    protected void onUpdate() {
        Element element = wrapper.getElement();
        String newId = getId();
        if (element.getId() != newId)
            element.setId(newId);
        Gwt.update(wrapper.getWidget());
    }

    /**
     * Initializes the widget if not already initialized.
     */
    public final void initialize() {

        // check if already initialized
        if (initialized)
            return;

        // check if initializing and prevent endless loop
        if (initializing)
            throw new RuntimeException("Widget already initializing: " + toString());
        initializing = true;

        // GwtLogger.DEBUG("Initializing widget: " + toString());
        Widget content = onInitialization();
        wrapper.setContent(content);
        wrapper.getElement().setId(getId());

        initialized = true;
        initializing = false;

    }

    public final void reset() {
        initialized = false;
    }

    protected void replaceContent(Widget widget) {
        initialize();
        wrapper.setContent(widget);
    }

    @Override
    public final AWidget update() {
        if (isResetRequired())
            reset();
        initialize();
        if (!isUpdateRequired())
            return this;
        onUpdate();
        return this;
    }

    protected boolean isUpdateRequired() {
        return true;
    }

    public final boolean isInitialized() {
        return initialized;
    }

    protected final void setHeight100() {
        wrapper.setStyleName("AWidget-height100");
    }

    public String getId() {
        return Str.getSimpleName(getClass()).replace('$', '_');
    }

    @Override
    public String toString() {
        return Gwt.getSimpleName(getClass());
    }

    @Override
    public void setStyleName(String style) {
        wrapper.setStyleName(style);
    }

    private class Wrapper extends SimplePanel {

        // private Widget content;
        //
        // @Override
        // protected Widget createWidget() {
        // initialize();
        // return content;
        // }
        //
        public void setContent(Widget conent) {
            // this.content = conent;
            setWidget(conent);
        }

    }

}