org.cruxframework.crux.widgets.client.styledpanel.StyledPanel.java Source code

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Here is the source code for org.cruxframework.crux.widgets.client.styledpanel.StyledPanel.java

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/*
 * Copyright 2011 cruxframework.org.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.cruxframework.crux.widgets.client.styledpanel;

import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * @author Gesse S. F. Dafe
 */
public class StyledPanel extends Composite implements HasHorizontalAlignment, HasVerticalAlignment {
    private static final String DEFAULT_OUTER_STYLE_NAME = "crux-StyledPanelOuter";
    private static final String DEFAULT_STYLE_NAME = "crux-StyledPanel";

    private VerticalAlignmentConstant verticalAlignment = HasVerticalAlignment.ALIGN_MIDDLE;
    private HorizontalAlignmentConstant horizontalAlignment = HasHorizontalAlignment.ALIGN_CENTER;

    private SimplePanel externalPanel = new SimplePanel();
    private SimplePanel internalPanel = new SimplePanel();

    public StyledPanel() {
        initWidget(externalPanel);
        externalPanel.add(internalPanel);

        Style extrnStyle = externalPanel.getElement().getStyle();
        extrnStyle.setProperty("display", "table");
        extrnStyle.setProperty("boxSizing", "border-box");

        Style intrnStyle = internalPanel.getElement().getStyle();
        intrnStyle.setProperty("display", "table-cell");
        intrnStyle.setWidth(100, Unit.PCT);

        externalPanel.setStyleName(DEFAULT_OUTER_STYLE_NAME);
        internalPanel.setStyleName(DEFAULT_STYLE_NAME);

        setHorizontalAlignment(horizontalAlignment);
        setVerticalAlignment(verticalAlignment);
    }

    @Override
    public VerticalAlignmentConstant getVerticalAlignment() {
        return this.verticalAlignment;
    }

    @Override
    public void setVerticalAlignment(VerticalAlignmentConstant align) {
        String verticalAlign = "";

        if (align != null) {
            this.verticalAlignment = align;

            if (this.verticalAlignment.equals(HasVerticalAlignment.ALIGN_MIDDLE)) {
                verticalAlign = "middle";
            } else if (this.verticalAlignment.equals(HasVerticalAlignment.ALIGN_BOTTOM)) {
                verticalAlign = "bottom";
            }
        }

        Style style = internalPanel.getElement().getStyle();
        style.setProperty("verticalAlign", verticalAlign);
    }

    @Override
    public HorizontalAlignmentConstant getHorizontalAlignment() {
        return this.horizontalAlignment;
    }

    @Override
    public void setHorizontalAlignment(HorizontalAlignmentConstant align) {
        String marginLeft = "";
        String marginRight = "";

        if (align != null) {
            this.horizontalAlignment = align;

            if (this.horizontalAlignment.equals(HasHorizontalAlignment.ALIGN_RIGHT)) {
                marginRight = "auto";
            }
            if (this.horizontalAlignment.equals(HasHorizontalAlignment.ALIGN_CENTER)) {
                marginLeft = "auto";
                marginRight = "auto";
            }
        }

        if (internalPanel.getWidget() != null) {
            Style childStyle = internalPanel.getWidget().getElement().getStyle();
            childStyle.setProperty("marginLeft", marginLeft);
            childStyle.setProperty("marginRight", marginRight);
        }
    }

    public void add(Widget w) {
        internalPanel.add(w);
        setHorizontalAlignment(getHorizontalAlignment());
    }

}