A simple GUI interface -- still needs work

git-svn-id: http://zxing.googlecode.com/svn/trunk@396 59b500cc-1b3d-0410-9834-0bbf25fbcc57

diff --git a/javase/src/com/google/zxing/client/j2se/GUIRunner.java b/javase/src/com/google/zxing/client/j2se/GUIRunner.java
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+/*
+ * Copyright 2008 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.zxing.client.j2se;
+
+import com.google.zxing.MonochromeBitmapSource;
+import com.google.zxing.MultiFormatReader;
+import com.google.zxing.ReaderException;
+import com.google.zxing.Result;
+
+import javax.imageio.ImageIO;
+import javax.swing.ImageIcon;
+import javax.swing.JFileChooser;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTextArea;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.FlowLayout;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.net.MalformedURLException;
+
+/**
+ * <p>Simple GUI frontend to the library. Right now, only decodes a local file.
+ * This definitely needs some improvement. Just throwing something down to start.</p>
+ *
+ * @author srowen@google.com (Sean Owen)
+ */
+public final class GUIRunner extends JFrame {
+
+  private final JLabel imageLabel;
+  private final JTextArea textArea;
+
+  private GUIRunner() {
+    imageLabel = new JLabel();
+    textArea = new JTextArea();
+    textArea.setEditable(false);
+    textArea.setMaximumSize(new Dimension(400, 200));
+    Container panel = new JPanel();
+    panel.setLayout(new FlowLayout());
+    panel.add(imageLabel);
+    panel.add(textArea);
+    setTitle("ZXing");
+    setSize(400, 400);
+    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+    setContentPane(panel);
+    setLocationRelativeTo(null);
+  }
+
+  public static void main(String[] args) throws Exception {
+    GUIRunner runner = new GUIRunner();
+    runner.setVisible(true);
+    runner.chooseImage();
+  }
+
+  private void chooseImage() {
+    JFileChooser fileChooser = new JFileChooser();
+    fileChooser.showOpenDialog(GUIRunner.this);
+    File file = fileChooser.getSelectedFile();
+    ImageIcon imageIcon;
+    try {
+      imageIcon = new ImageIcon(file.toURL());
+    } catch (MalformedURLException mue) {
+      throw new RuntimeException(mue);
+    }
+    setSize(imageIcon.getIconWidth(), imageIcon.getIconHeight() + 100);
+    imageLabel.setIcon(imageIcon);
+    String decodeText = getDecodeText(file);
+    textArea.setText(decodeText);
+  }
+
+  private static String getDecodeText(File file) {
+    BufferedImage image;
+    try {
+      image = ImageIO.read(file);
+    } catch (IOException ioe) {
+      return ioe.toString();
+    }
+    if (image == null) {
+      return "Could not decode image";
+    }
+    MonochromeBitmapSource source = new BufferedImageMonochromeBitmapSource(image);
+    Result result;
+    try {
+      result = new MultiFormatReader().decode(source);
+    } catch (ReaderException re) {
+      return re.toString();
+    }
+    return result.getText();
+  }
+
+}
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