com.google.gapid.views.LogView.java Source code

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Here is the source code for com.google.gapid.views.LogView.java

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/*
 * Copyright (C) 2017 Google Inc.
 *
 * 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.google.gapid.views;

import com.google.gapid.util.Logging;
import com.google.gapid.widgets.Widgets;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.TextViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * A view that shows log messages.
 */
public class LogView extends Composite implements Tab {
    private final TextViewer text;
    private final AtomicBoolean dirty = new AtomicBoolean(false);

    public LogView(Composite parent) {
        super(parent, SWT.NONE);
        setLayout(new FillLayout(SWT.VERTICAL));

        text = new TextViewer(this, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
        text.setEditable(false);
        text.getTextWidget().setFont(JFaceResources.getFont(JFaceResources.TEXT_FONT));
        text.setDocument(new Document());
        updateText();
        Logging.setListener(() -> {
            if (!dirty.getAndSet(true)) {
                Widgets.scheduleIfNotDisposed(this, this::updateText);
            }
        });
        addListener(SWT.Dispose, e -> Logging.setListener(null));
    }

    private void updateText() {
        String message = Logging.getLogMessages();
        text.getDocument().set(message);
        text.setTopIndex(message.length() - 1);
        dirty.set(false);
    }

    @Override
    public Control getControl() {
        return this;
    }
}