ch.heftix.mailxel.client.MultiLinePanel.java Source code

Introduction

Here is the source code for ch.heftix.mailxel.client.MultiLinePanel.java

Source

/*
 * Copyright (C) 2008-2011 by Simon Hefti. All rights reserved.
 * Licensed under the EPL 1.0 (Eclipse Public License).
 * (see http://www.eclipse.org/legal/epl-v10.html)
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
 * 
 * Initial Developer: Simon Hefti
 */
package ch.heftix.mailxel.client;

import java.util.HashMap;
import java.util.Map;

import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/** a horizontal panel which breaks over several lines */
public class MultiLinePanel extends VerticalPanel {

    private int maxLength = 100;
    private int totalChars = 0;
    private HorizontalPanel curPanel = null;
    private String separator = null;
    // fixme: find a better way for widget removal
    private Map<Widget, HorizontalPanel> widgetPanelMap = new HashMap<Widget, HorizontalPanel>();

    /**
     * @param maxLength a new line is started after maxLength chars
     * @param separator widget used to separate entries
     * @param separatorLength length of separator widget, in chars
     */
    public MultiLinePanel(final int maxLength, final String separator) {
        this.maxLength = maxLength;
        this.separator = separator;
        curPanel = new HorizontalPanel();
        totalChars = 0;
        add(curPanel);
    }

    /**
     * @param maxLength a new line is started after maxLength chars
     */
    public MultiLinePanel(final int maxLength) {
        this.maxLength = maxLength;
        this.separator = null;
        curPanel = new HorizontalPanel();
        totalChars = 0;
        add(curPanel);
    }

    public void setSeparator(final String separator) {
        this.separator = separator;
    }

    /**
     * add new widget, create new line if necessary
     * 
     * @param widget widget to be added
     * @param length length, in chars, of this widget
     */
    public void addWidget(final Widget widget, final int length) {

        if (totalChars > maxLength) {
            // start a new line
            curPanel = new HorizontalPanel();
            add(curPanel);
            totalChars = 0;
        }
        if (null != separator && curPanel.getWidgetCount() > 0) {
            curPanel.add(new Label(separator));
            totalChars += separator.length();
        }
        curPanel.add(widget);
        widgetPanelMap.put(widget, curPanel);
        totalChars += length;
    }

    public void removeWidget(final Widget widget) {
        HorizontalPanel p = widgetPanelMap.get(widget);
        p.remove(widget);
        widgetPanelMap.remove(widget);
    }
}