symbolinputmode.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 728 行 · 第 1/2 页

/*
 *
 *
 * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License version 2 for more details (a copy is
 * included at /legal/license.txt).
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions.
 */
package com.sun.midp.chameleon.input;
import javax.microedition.lcdui.TextField;

import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import com.sun.midp.i18n.Resource;
import com.sun.midp.i18n.ResourceConstants;
import com.sun.midp.lcdui.EventConstants;

/**
 * An InputMode instance which allows to select the particular symbol
 * from the table of predefined symbols.
 */
public class SymbolInputMode implements InputMode {

    /** A holder for the keyCode which was last processed */
    protected int lastKey = KEYCODE_NONE;

    /** The InputModeMediator for the current input session */
    protected InputModeMediator mediator;

    /** Symbol table */
    protected final SymbolTable st = new SymbolTable();

    /**
     * The number of symbol_table is designed to be 29 for 5x6 matrix,
     * starting the selection at 12.  But if you have more, the total
     * must be under 36 for 6x6 matrix.
     */
    protected final static char[] symbolTableChars;

    static {
        symbolTableChars =
            Resource.getString(ResourceConstants.LCDUI_TF_SYMBOLS_TABLE).
            toCharArray();
    }


    /**
     * This method is called to determine if this InputMode supports
     * the given text input constraints. The semantics of the constraints
     * value are defined in the javax.microedition.lcdui.TextField API.
     * If this InputMode returns false, this InputMode must not be used
     * to process key input for the selected text component.
     *
     * @param constraints text input constraints. The semantics of the
     * constraints value are defined in the TextField API.
     *
     * @return true if this InputMode supports the given text component
     *         constraints, as defined in the MIDP TextField API
     */
    public boolean supportsConstraints(int constraints) {
        switch (constraints & TextField.CONSTRAINT_MASK) {
            case TextField.NUMERIC:
            case TextField.DECIMAL:
            case TextField.PHONENUMBER:
                return false;
            default:
                return true;
        }
    }

    /**
     * Returns the display name which will represent this InputMode to
     * the user, such as in a selection list or the softbutton bar.
     *
     * @return the locale-appropriate name to represent this InputMode
     *         to the user
     */
    public String getName() {
        return Resource.getString(ResourceConstants.LCDUI_TF_SYMBOLS);
    }

    /**
     * Returns the command name which will represent this InputMode to
     * the user
     *
     * @return the locale-appropriate command name to represent this InputMode
     *         to the user
     */
    public String getCommandName() {
        return getName();
    }

    /**
     * This method will be called before any input keys are passed
     * to this InputMode to allow the InputMode to perform any needed
     * initialization. A reference to the InputModeMediator which is
     * currently managing the relationship between this InputMode and
     * the input session is passed in. This reference can be used
     * by this InputMode to commit text input as well as end the input
     * session with this InputMode. The reference is only valid until
     * this InputMode's endInput() method is called.
     *
     * @param constraints text input constraints. The semantics of the
     * constraints value are defined in the TextField API.
     *
     * @param mediator the InputModeMediator which is negotiating the
     *        relationship between this InputMode and the input session
     *
     * @param inputSubset current input subset
     */
    public void beginInput(InputModeMediator mediator, String inputSubset,
                           int constraints) {
        validateState(false);
        this.mediator = mediator;
    }

    /**
     * Symbol Input mode is represented by Symbol table implemented as canvas
     * @return SymbolTable
     */
    public Displayable getDisplayable() {
        return st;
    }

    /**
     * Process the given key code as input.
     *
     * This method will return true if the key was processed successfully,
     * false otherwise.
     *
     * @param keyCode the keycode of the key which was input
     * @param longPress return true if it's long key press otherwise false
     * @return true if the key was processed by this InputMode, false
     *         otherwise.
     */
    public int processKey(int keyCode, boolean longPress) {
        return KEYCODE_NONE;
    }

    /**
     * return the pending char
     * used to bypass the asynchronous commit mechanism
     * e.g. to immediately commit a char before moving the cursor
     * @return return the pending char
     */
    public char getPendingChar() {
        return lastKey == KEYCODE_NONE ? 0 : (char)lastKey;
    }

    /**
     * Return the next possible match for the key input processed thus
     * far by this InputMode. A call to this method should be preceeded
     * by a check of hasMoreMatches(). If the InputMode has more available
     * matches for the given input, this method will return them one by one.
     *
     * @return a String representing the next available match to the key
     *         input thus far
     */
    public String getNextMatch() {
        return null;
    }

    /**
     * True, if after processing a key, there is more than one possible
     * match to the input. If this method returns true, the getNextMatch()
     * method can be called to return the value.
     *
     * @return true if after processing a key, there is more than the one
     *         possible match to the given input
     */
    public boolean hasMoreMatches() {
        return false;
    }

    /**
     * Gets the possible string matches
     *
     * @return returns the set of options.
     */
    public String[] getMatchList() {
        return new String[0];
    }


    /**
     * Mark the end of this InputMode's processing. The only possible call
     * to this InputMode after a call to endInput() is a call to beginInput()
     * to begin a new input session.
     */
    public void endInput() {
        validateState(true);
        mediator = null;
    }

    /**
     * Returns true if input mode is using its own displayable, false ifinput
     * mode does not require the speial displayable for its representation.
     * For Symbol mode is represented by Symbol table canvas, so it returns true
     * @return true if input mode is using its own displayable, otherwise false
     */
    public boolean hasDisplayable() {
        return true;
    }

    /**
     * This method will validate the state of this InputMode. If this
     * is a check for an "active" operation, the TextInputMediator must
     * be non-null or else this method will throw an IllegalStateException.
     * If this is a check for an "inactive" operation, then the
     * TextInputMediator should be null.
     * @param activeOperation true if any operation is active otherwise false.
     */
    protected void validateState(boolean activeOperation) {
        if (activeOperation && mediator == null) {
            throw new IllegalStateException(
            "Illegal operation on an input session already in progress");
        } else if (!activeOperation && mediator != null) {
            throw new IllegalStateException(
            "Illegal operation on an input session which is not in progress");
        }
    }

    /**
     * A special Canvas to display a symbol table.
     */
    protected class SymbolTable extends Canvas implements CommandListener {
        /** The margin size */
        private static final int MARGIN = 1;

        /** The margin size */
        private static final int DMARGIN = 2;

        /** Select commant to accept the symbol */
        private final Command okCmd = new Command(
             Resource.getString(ResourceConstants.OK), Command.OK, 1);

        /** Back commant to reject the symbol */
        private final Command backCmd = new Command(
             Resource.getString(ResourceConstants.BACK), Command.BACK, 0);

        /** Cell size */
        private int cellSize;

        /** Height margin */
        private int hmargin;

        /** Width margin */
        private int wmargin;

        /** Margin for the cursor */
        private int margin = 1;

        /** Window x position */
        private int wx;

        /** Window y position */
        private int wy;

        /** Window width */
        private int ww;

        /** Window height */
        private int wh;

        /** Number of columns */
        private int cols;

        /** Number of rows */
        private int rows;

        /** Current cursor position */
        private int pos;

        /** New cursor position */
        private int newpos;

        /** Font */
        private Font font;

        /** x cursor coordinate */
        int x_cursor_coord;

        /** y cursor coordinate */
        int y_cursor_coord;

        /** default location to start the cursor */
        protected int defaultSymbolCursorPos = 14;

        /** Default constructor for SymbolTable */
        protected SymbolTable() {
            init();
        }

        /**
         * Symbol accept is run in separate thread
         */
        private class Accept implements Runnable {
            /**
             * run for accept
             */
            public void run() {
                lastKey = symbolTableChars[pos];
                completeInputMode(true);
            }
        }

        /**
         * Symbol reject is run in separate thread
         */
        private class Reject implements Runnable {
            /**
             * run for reject
             */
            public void run() {
                completeInputMode(false);
            }
        }

        /**
         * Instance of accept object
         */
        private Runnable accept = new Accept();

        /**
         * Instance of reject object
         */
        private Runnable reject = new Reject();

        /**
         * Initialize the symbol table
         */
        void init() {
            calculateProportions();
            addCommand(backCmd);
            addCommand(okCmd);
            setCommandListener(this);
        }

        /**
         *   Calculate numbers of colomns and rows of symbol table.
         *   Calculate cell size of symbol table.
         */
        private void calculateProportions() {