/* * @(#)GUIImageClient.java	1.2 04/06/24 * * Copyright (c) 2000-2004 Sun Microsystems, Inc. All rights reserved. * PROPRIETARY/CONFIDENTIAL * Use is subject to license terms */package example.bluetooth.demo;// midp GUI classesimport javax.microedition.lcdui.Alert;import javax.microedition.lcdui.AlertType;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Form;import javax.microedition.lcdui.Gauge;import javax.microedition.lcdui.Image;import javax.microedition.lcdui.ImageItem;import javax.microedition.lcdui.List;import javax.microedition.lcdui.StringItem;// midp/cldc classesimport java.io.IOException;import java.util.Hashtable;import java.util.Enumeration;/** * Provides a GUI to present the download options * to used, gives a chance to make a choice, * finally shows the downloaded image. * * @version 1.2, 06/24/04 */final class GUIImageClient implements CommandListener {    /** This command goes to demo main screen. */    private final Command SCR_MAIN_BACK_CMD = new Command("Back", Command.BACK,            2);    /** Starts the proper services search. */    private final Command SCR_MAIN_SEARCH_CMD = new Command("Find", Command.OK,            1);    /** Cancels the device/services discovering. */    private final Command SCR_SEARCH_CANCEL_CMD = new Command("Cancel",            Command.BACK, 2);    /** This command goes to client main screen. */    private final Command SCR_IMAGES_BACK_CMD = new Command("Back",            Command.BACK, 2);    /** Start the chosen image download. */    private final Command SCR_IMAGES_LOAD_CMD = new Command("Load", Command.OK,            1);    /** Cancels the image download. */    private final Command SCR_LOAD_CANCEL_CMD = new Command("Cancel",            Command.BACK, 2);    /** This command goes from image screen to images list one. */    private final Command SCR_SHOW_BACK_CMD = new Command("Back", Command.BACK,            2);    /** The main screen of the client part. */    private final Form mainScreen = new Form("Image Viewer");    /** The screen with found images names. */    private final List listScreen = new List("Image Viewer", List.IMPLICIT);    /** The screen with download image. */    private final Form imageScreen = new Form("Image Viewer");    /** Keeps the parent MIDlet reference to process specific actions. */    private DemoMIDlet parent;    /** This object handles the real transmission. */    private BTImageClient bt_client;    /** Constucts client GUI. */    GUIImageClient(DemoMIDlet parent) {        this.parent = parent;        bt_client = new BTImageClient(this);        mainScreen.addCommand(SCR_MAIN_BACK_CMD);        mainScreen.addCommand(SCR_MAIN_SEARCH_CMD);        mainScreen.setCommandListener(this);        listScreen.addCommand(SCR_IMAGES_BACK_CMD);        listScreen.addCommand(SCR_IMAGES_LOAD_CMD);        listScreen.setCommandListener(this);        imageScreen.addCommand(SCR_SHOW_BACK_CMD);        imageScreen.setCommandListener(this);    }    /**     * Process the command events.     *     * @param c - the issued command.     * @param d - the screen object the command was issued for.     */    public void commandAction(Command c, Displayable d) {        // back to demo main screen        if (c == SCR_MAIN_BACK_CMD) {            destroy();            parent.show();            return;        }        // starts images (device/services) search        if (c == SCR_MAIN_SEARCH_CMD) {            Form f = new Form("Searching...");            f.addCommand(SCR_SEARCH_CANCEL_CMD);            f.setCommandListener(this);            f.append(new Gauge("Searching images...", false, Gauge.INDEFINITE,                    Gauge.CONTINUOUS_RUNNING));            Display.getDisplay(parent).setCurrent(f);            bt_client.requestSearch();            return;        }        // cancels device/services search        if (c == SCR_SEARCH_CANCEL_CMD) {            bt_client.cancelSearch();            Display.getDisplay(parent).setCurrent(mainScreen);            return;        }        // back to client main screen        if (c == SCR_IMAGES_BACK_CMD) {            bt_client.requestLoad(null);            Display.getDisplay(parent).setCurrent(mainScreen);            return;        }        // starts image download        if (c == SCR_IMAGES_LOAD_CMD) {            Form f = new Form("Loading...");            f.addCommand(SCR_LOAD_CANCEL_CMD);            f.setCommandListener(this);            f.append(new Gauge("Loading image...", false, Gauge.INDEFINITE,                    Gauge.CONTINUOUS_RUNNING));            Display.getDisplay(parent).setCurrent(f);            List l = (List) d;            bt_client.requestLoad(l.getString(l.getSelectedIndex()));            return;        }        // cancels image load        if (c == SCR_LOAD_CANCEL_CMD) {            bt_client.cancelLoad();            Display.getDisplay(parent).setCurrent(listScreen);            return;        }        // back to client main screen        if (c == SCR_SHOW_BACK_CMD) {            Display.getDisplay(parent).setCurrent(listScreen);            return;        }    }    /**     * We have to provide this method due to "do not do network     * operation in command listener method" restriction, which     * is caused by crooked midp design.     *     * This method is called by BTImageClient after it is done     * with bluetooth initialization and next screen is ready     * to appear.     */    void completeInitialization(boolean isBTReady) {        // bluetooth was initialized successfully.        if (isBTReady) {            StringItem si = new StringItem("Ready for images search!", null);            si.setLayout(StringItem.LAYOUT_CENTER | StringItem.LAYOUT_VCENTER);            mainScreen.append(si);            Display.getDisplay(parent).setCurrent(mainScreen);            return;        }        // something wrong        Alert al = new Alert("Error", "Can't inititialize bluetooth", null,                AlertType.ERROR);        al.setTimeout(DemoMIDlet.ALERT_TIMEOUT);        Display.getDisplay(parent).setCurrent(al, parent.getDisplayable());    }    /** Destroys this component. */    void destroy() {        // finilize the image client work        bt_client.destroy();    }    /**     * Informs the error during the images search.     */    void informSearchError(String resMsg) {        Alert al = new Alert("Error", resMsg, null, AlertType.ERROR);        al.setTimeout(DemoMIDlet.ALERT_TIMEOUT);        Display.getDisplay(parent).setCurrent(al, mainScreen);    }    /**     * Informs the error during the selected image load.     */    void informLoadError(String resMsg) {        Alert al = new Alert("Error", resMsg, null, AlertType.ERROR);        al.setTimeout(DemoMIDlet.ALERT_TIMEOUT);        Display.getDisplay(parent).setCurrent(al, listScreen);    }    /**     * Shows the downloaded image.     */    void showImage(Image img, String imgName) {        imageScreen.deleteAll();        imageScreen.append(new ImageItem(imgName, img,                            ImageItem.LAYOUT_CENTER | ImageItem.LAYOUT_VCENTER,                            "Downloaded image: " + imgName));        Display.getDisplay(parent).setCurrent(imageScreen);    }    /**     * Shows the available images names.     *     * @returns false if no images names were found actually     */    boolean showImagesNames(Hashtable base) {        Enumeration keys = base.keys();        // no images actually        if (!keys.hasMoreElements()) {            informSearchError("No images names in found services");            return false;        }        // prepare the list to be shown        while (listScreen.size() != 0) {            listScreen.delete(0);        }        while (keys.hasMoreElements()) {            listScreen.append((String) keys.nextElement(), null);        }        Display.getDisplay(parent).setCurrent(listScreen);        return true;    }} // end of class 'GUIImageClient' definition