com.sciencegadgets.client.ui.CommunistPanel.java Source code

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Here is the source code for com.sciencegadgets.client.ui.CommunistPanel.java

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/*******************************************************************************
 *     This file is part of ScienceGadgets, a collection of educational tools
 *     Copyright (C) 2012-2015 by John Gralyan
 *
 *     ScienceGadgets 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.
 *
 *     ScienceGadgets 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 Affero General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *     
 *     Contact us at info@sciencegadgets.org
 *******************************************************************************/
package com.sciencegadgets.client.ui;

import java.util.ArrayList;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * Automatically gives even spacing to all the children and fills this panel
 * completely
 * 
 * 
 */
public class CommunistPanel extends FlowPanel {

    boolean isHorizontal = false;
    ArrayList<Double> sizes = new ArrayList<Double>();

    public CommunistPanel() {
        this(true);
    }

    public CommunistPanel(boolean isHorizontal) {
        this.isHorizontal = isHorizontal;
    }

    public void addAll(Widget[] widgets) {
        for (Widget widget : widgets) {
            addComrade(widget);
        }
        redistribute();
    }

    public void addAll(Iterable<? extends Widget> widgets) {
        for (Widget widget : widgets) {
            addComrade(widget);
        }
        redistribute();
    }

    /**
     * When adding iteratively, consider using the an addAll method, especially
     * when adding a FitParentHTML
     */
    @Override
    public void add(Widget widget) {
        addComrade(widget);
        redistribute();
    }

    private void addComrade(Widget widget) {
        Widget container = widget;
        if (widget instanceof FitParentHTML) {
            FitParentHTML w = (FitParentHTML) widget;
            container = new HasFitParentHTML.FitParentContainer(w);
            w.setPanel(this);
        } else if (widget instanceof HasFitParentHTML) {
            HasFitParentHTML w = (HasFitParentHTML) widget;
            FitParentHTML fit = w.getFitParentHTML();
            fit.setPanel(this);
        }
        if (isHorizontal) {
            container.addStyleName(CSS.LAYOUT_ROW);
        }
        super.add(container);
    }

    public void clear() {
        int count = getWidgetCount();
        for (int i = 0; i < count; i++) {
            getWidget(0).removeFromParent();
        }
    }

    protected void redistribute() {
        int count = this.getWidgetCount();
        if (count <= 0) {
            return;
        }
        int portion = 100 / count;
        for (int i = 0; i < count; i++) {
            Widget member = getWidget(i);
            if (isHorizontal) {
                member.setWidth(portion + "%");
                member.setHeight("100%");
            } else {
                member.setHeight(portion + "%");
                member.setWidth("100%");
            }
        }
    }

}