Commit Simon's changes for Issue 134

git-svn-id: https://zxing.googlecode.com/svn/trunk@838 59b500cc-1b3d-0410-9834-0bbf25fbcc57

javame/src/com/google/zxing/client/j2me/Menu.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2009 ZXing authors
+ *
+ * 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.j2me;
+
+import javax.microedition.lcdui.Command;
+import javax.microedition.lcdui.CommandListener;
+import javax.microedition.lcdui.Display;
+import javax.microedition.lcdui.Displayable;
+import javax.microedition.lcdui.List;
+
+/**
+ * The Menu form simply adds Command Listener functionality
+ * to the standard List User Interface component.
+ *
+ * @author Simon Flannery (simon.flannery@gmail.com)
+ */
+final class Menu extends List implements CommandListener {
+
+  private final ZXingMIDlet zXingMIDlet;
+  private Command cancelCommand;
+  private Command barcodeCommand;
+
+  /**
+   * Creates a new Search List and initialises all components.
+   *
+   * @param parent The Parent ZXing MIDlet.
+   * @param title The title of the List.
+   * @param item The caption of the item action Command.
+   */
+  Menu(ZXingMIDlet parent, String title, String item) {
+    super(title, IMPLICIT); // Set the title of the form
+    zXingMIDlet = parent;
+    // Build the UI components
+    cancelCommand  = new Command("Cancel", Command.CANCEL, 0);
+    barcodeCommand = new Command(item, Command.ITEM, 0);
+    addCommand(cancelCommand);
+    addCommand(barcodeCommand);
+    setCommandListener(this);
+  }
+
+  /**
+   * A convenience method for getting the selected option item.
+   *
+   * @return The selected option represented as a String. If no option is
+   *         selected, then the empty string is returned.
+   */
+  public String getSelectedString() {
+    String result = "";
+    if (getSelectedIndex() != -1) {
+      result = getString(getSelectedIndex());
+    }
+    return result;
+  }
+
+  /**
+   * A convenience method for removing all items from the list.
+   * While the size of the list does not equal zero, the first item of the list is deleted.
+   */
+  public void clear() {
+    while (size() != 0) { // Delete the first-most element until there is no first-most element
+      delete(0);
+    }
+  }
+
+  /**
+   * CommandListener Required Implementation for capturing soft key presses.
+   * This is where all call back methods (of the MIDlet) are serviced.
+   *
+   * @param command The command requiring attention.
+   * @param displayable The Display.
+   */
+  public void commandAction(Command command, Displayable displayable) {
+    if (command == cancelCommand) { /* Detecting the soft key press. */
+      Display.getDisplay(zXingMIDlet).setCurrent(zXingMIDlet.getCanvas());
+    } else if (command == barcodeCommand || command == SELECT_COMMAND) {
+      if (getSelectedIndex() != -1) {
+        zXingMIDlet.itemRequest();
+      }
+    }
+  }
+
+}

javame/src/com/google/zxing/client/j2me/VideoCanvas.java

@@ -27,10 +27,12 @@ import javax.microedition.lcdui.Graphics;
  * This class manages decoding via {@link SnapshotThread}.
  *
  * @author Sean Owen
+ * @author Simon Flannery
  */
 final class VideoCanvas extends Canvas implements CommandListener {
 
   private static final Command exit = new Command("Exit", Command.EXIT, 1);
+  private static final Command history = new Command("History", Command.ITEM, 0);
 
   private final ZXingMIDlet zXingMIDlet;
   private final SnapshotThread snapshotThread;
@@ -38,6 +40,7 @@ final class VideoCanvas extends Canvas implements CommandListener {
   VideoCanvas(ZXingMIDlet zXingMIDlet) {
     this.zXingMIDlet = zXingMIDlet;
     addCommand(exit);
+    addCommand(history);
     setCommandListener(this);
     snapshotThread = new SnapshotThread(zXingMIDlet);
     new Thread(snapshotThread).start();
@@ -58,7 +61,9 @@ final class VideoCanvas extends Canvas implements CommandListener {
 
   public void commandAction(Command command, Displayable displayable) {
     int type = command.getCommandType();
-    if (type == Command.EXIT || type == Command.STOP || type == Command.BACK || type == Command.CANCEL) {
+    if (command == history) {
+      zXingMIDlet.historyRequest();
+    } else if (type == Command.EXIT || type == Command.STOP || type == Command.BACK || type == Command.CANCEL) {
       snapshotThread.stop();
       zXingMIDlet.stop();
     }

javame/src/com/google/zxing/client/j2me/ZXingMIDlet.java

@@ -42,11 +42,13 @@ import javax.microedition.media.control.VideoControl;
 import javax.microedition.midlet.MIDlet;
 import javax.microedition.midlet.MIDletStateChangeException;
 import java.io.IOException;
+import java.util.Vector;
 
 /**
  * <p>The actual reader application {@link MIDlet}.</p>
  *
  * @author Sean Owen
+ * @author Simon Flannery
  */
 public final class ZXingMIDlet extends MIDlet {
 
@@ -57,6 +59,8 @@ public final class ZXingMIDlet extends MIDlet {
   private VideoControl videoControl;
   private Alert confirmation;
   private Alert alert;
+  private Menu history;
+  private Vector resultHistory;
 
   Displayable getCanvas() {
     return canvas;
@@ -79,8 +83,12 @@ public final class ZXingMIDlet extends MIDlet {
   protected void startApp() throws MIDletStateChangeException {
     try {
       Image image = Image.createImage("/res/zxing-icon.png");
-      SplashThread splash = new SplashThread(this, 2000, image);
+      Displayable splash = new SplashThread(this, 2000, image);
       Display.getDisplay(this).setCurrent(splash);
+
+      resultHistory = new Vector(5);
+      history = new Menu(this, "Scan History", "Use");
+
       player = createPlayer();
       player.realize();
       MultimediaManager multimediaManager = buildMultimediaManager();
@@ -115,7 +123,7 @@ public final class ZXingMIDlet extends MIDlet {
       videoControl.setVisible(true);
       player.start();
     } catch (MediaException me) {
-      // continue
+      showError(me);
     }
     Display.getDisplay(this).setCurrent(canvas);
   }
@@ -170,6 +178,10 @@ public final class ZXingMIDlet extends MIDlet {
     notifyDestroyed();
   }
 
+  void historyRequest() {
+    Display.getDisplay(this).setCurrent(history);
+  }
+
   // Convenience methods to show dialogs
 
   private void showOpenURL(String title, String display, final String uri) {
@@ -223,8 +235,7 @@ public final class ZXingMIDlet extends MIDlet {
     display.setCurrent(alert, canvas);
   }
 
-  void handleDecodedText(Result theResult) {
-    ParsedResult result = ResultParser.parseResult(theResult);
+  void barcodeAction(ParsedResult result) {
     ParsedResultType type = result.getType();
     if (type.equals(ParsedResultType.URI)) {
       String uri = ((URIParsedResult) result).getURI();
@@ -247,4 +258,26 @@ public final class ZXingMIDlet extends MIDlet {
     }
   }
 
+  void itemRequest() {
+    ParsedResult result = (ParsedResult) resultHistory.elementAt(history.getSelectedIndex());
+    barcodeAction(result);
+  }
+
+  void handleDecodedText(Result theResult) {
+    ParsedResult result = ResultParser.parseResult(theResult);
+    String resultString = result.toString();
+    int i = 0;
+    while (i < resultHistory.size()) {
+      if (resultString.equals(resultHistory.elementAt(i).toString())) {
+        break;
+      }
+      i++;
+    }
+    if (i == resultHistory.size()) {
+      resultHistory.addElement(result);
+      history.append(result.getDisplayResult(), null);
+    }
+    barcodeAction(result);
+  }
+
 }