com.akjava.gwt.volumegraph.client.LogBox.java Source code

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Here is the source code for com.akjava.gwt.volumegraph.client.LogBox.java

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/*
 * Copyright (C) 2011 aki@akjava.com
 *
 * 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 com.akjava.gwt.volumegraph.client;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.TextArea;
import com.google.gwt.user.client.ui.VerticalPanel;

public class LogBox extends VerticalPanel {
    private List<String> lines = new ArrayList<String>();
    private TextArea area;
    private int maxLine = 20;

    public LogBox() {
        area = new TextArea();
        area.setSize("100%", "100%");
        add(area);
        Button clearBt = new Button("Clear");
        add(clearBt);
        clearBt.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                clear();
            }
        });
    }

    public void log(String line) {
        lines.add(line);
        if (lines.size() >= maxLine) {
            lines.remove(0);
        }
        StringBuilder builder = new StringBuilder();
        for (String nl : lines) {
            builder.append(nl + "\n");
        }
        area.setText(builder.toString());
    }

    public void clear() {
        lines.clear();
        area.setText("");
    }
}