Source Code Cross Referenced for DetachedTreeLoggerWindow.java in  » Ajax » GWT » com » google » gwt » dev » util » log » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » GWT » com.google.gwt.dev.util.log 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2007 Google Inc.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005:         * use this file except in compliance with the License. You may obtain a copy of
006:         * the License at
007:         * 
008:         * http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012:         * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013:         * License for the specific language governing permissions and limitations under
014:         * the License.
015:         */
016:        package com.google.gwt.dev.util.log;
017:
018:        import com.google.gwt.dev.shell.LowLevel;
019:
020:        import org.eclipse.swt.layout.FillLayout;
021:        import org.eclipse.swt.widgets.Display;
022:        import org.eclipse.swt.widgets.Shell;
023:
024:        /**
025:         * Useful for debugging, this class manages to standalone window
026:         * and provides access to a logger you can use to write to it.
027:         * 
028:         */
029:        public class DetachedTreeLoggerWindow implements  Runnable {
030:            private static DetachedTreeLoggerWindow singleton;
031:
032:            /**
033:             * Provides a reference to a singleton <code>DetachedTreeLoggerWindow</code>.
034:             * 
035:             * @param caption the text to appear in the windows title bar.
036:             * @param width the widget of the window
037:             * @param height the height of the window
038:             * @param autoScroll whether or not the window should autoscroll as output is
039:             *          produced
040:             * @return a proxy object providing limited control of the window.
041:             */
042:            public static synchronized DetachedTreeLoggerWindow getInstance(
043:                    final String caption, final int width, final int height,
044:                    final boolean autoScroll) {
045:                if (singleton == null) {
046:                    singleton = new DetachedTreeLoggerWindow(caption, width,
047:                            height, autoScroll);
048:                }
049:                return singleton;
050:            }
051:
052:            private final Shell shell;
053:            private final AbstractTreeLogger logger;
054:            private boolean isRunning = false;
055:
056:            private DetachedTreeLoggerWindow(final String caption,
057:                    final int width, final int height, final boolean autoScroll) {
058:
059:                shell = new Shell(Display.getCurrent());
060:                shell.setText(caption);
061:                FillLayout fillLayout = new FillLayout();
062:                fillLayout.marginWidth = 0;
063:                fillLayout.marginHeight = 0;
064:                shell.setLayout(fillLayout);
065:
066:                final TreeLoggerWidget treeLoggerWidget = new TreeLoggerWidget(
067:                        shell);
068:                treeLoggerWidget.setAutoScroll(autoScroll);
069:                logger = treeLoggerWidget.getLogger();
070:
071:                shell.setImage(LowLevel.loadImage("gwt.ico"));
072:                shell.setSize(width, height);
073:                shell.open();
074:            }
075:
076:            public AbstractTreeLogger getLogger() {
077:                return logger;
078:            }
079:
080:            public synchronized boolean isRunning() {
081:                return isRunning;
082:            }
083:
084:            public void run() {
085:                if (!maybeStart()) {
086:                    throw new IllegalStateException(
087:                            "DetachedTreeLogger window is already running.");
088:                }
089:
090:                final Display display = shell.getDisplay();
091:                while (!shell.isDisposed()) {
092:                    if (!display.readAndDispatch()) {
093:                        display.sleep();
094:                    }
095:                }
096:            }
097:
098:            private synchronized boolean maybeStart() {
099:                if (isRunning) {
100:                    return false;
101:                }
102:                isRunning = true;
103:                return true;
104:            }
105:        }
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