choicetextfield.java

j2me polish学习的经典代码

//#condition polish.usePolishGui
/*
 * Created on 27-Feb-2006 at 7:36:20.
 * 
 * Copyright (c) 2004-2006 Robert Virkus / Enough Software
 *
 * This file is part of J2ME Polish.
 *
 * J2ME Polish is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * J2ME Polish 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with J2ME Polish; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Commercial licenses are also available, please
 * refer to the accompanying LICENSE.txt or visit
 * http://www.j2mepolish.org for details.
 */
package de.enough.polish.ui;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;

//#if polish.blackberry
import de.enough.polish.blackberry.ui.PolishEditField;
//#endif
import de.enough.polish.util.TextUtil;

/**
 * <p>Provides a TextField that provides the user with possible matches for the current input.</p>
 *
 * <p>Copyright Enough Software 2006</p>
 * <pre>
 * history
 *        27-Feb-2006 - rob creation
 * </pre>
 * @author Robert Virkus, [e-mail]
 */
public class ChoiceTextField 
//#if polish.LibraryBuild
	extends FakeTextFieldCustomItem
//#else
	//# extends TextField 
//#endif
{

	/** 
	 * The matching mode that selects choices that start with the same characters as the current input
	 */
	public static final int MATCH_STARTS_WITH = 0;
	/** 
	 * The matching mode that selects choices that contain the same characters as the current input
	 */
	public static final int MATCH_INDEX_OF = 1;

	private final boolean isAllowFreeTextEntry;
	private final Container choicesContainer;
	private String[] choices;
	private String[] lowerCaseChoices;
	private int numberOfMatches;
	private boolean isInChoice;
	private Item[] choiceItems;
	private String lastMatchingText;
	private Style originalStyle;
	private Style focusingStyle;
	private int matchMode;
	private boolean reenableCaretFlashing = true;
	private int choicesYOffsetAdjustment;
	private boolean isOpen;
	private Style choiceItemStyle;
	private String appendChoiceDelimiter;
	private boolean isAppendMode;
	private int appendDelimiterIndex = -1;

	/**
	 * Creates a new ChoiceTextField.
	 * 
	 * @param label the label
	 * @param text the current text
	 * @param maxSize the maximum size for the input
	 * @param constraints input constraints, TextField.ANY for no constraints
	 * @param availableChoices a list of available texts for the user
	 * @param allowFreeTextEntry true when the user should be allowed to enter any text that does not match any existing choice
	 */
	public ChoiceTextField(String label, String text, int maxSize, int constraints, String[] availableChoices, boolean allowFreeTextEntry) {
		this(label, text, maxSize, constraints, availableChoices, allowFreeTextEntry, false, ";", null);
	}
	
	/**
	 * Creates a new ChoiceTextField.
	 * 
	 * @param label the label
	 * @param text the current text
	 * @param maxSize the maximum size for the input
	 * @param constraints input constraints, TextField.ANY for no constraints
	 * @param availableChoices a list of available texts for the user
	 * @param allowFreeTextEntry true when the user should be allowed to enter any text that does not match any existing choice
	 * @param style the style for this item
	 */
	public ChoiceTextField(String label, String text, int maxSize, int constraints, String[] availableChoices, boolean allowFreeTextEntry, Style style) {
		this(label, text, maxSize, constraints, availableChoices, allowFreeTextEntry, false, ";", style );		
	}
	
	/**
	 * Creates a new ChoiceTextField.
	 * 
	 * @param label the label
	 * @param text the current text
	 * @param maxSize the maximum size for the input
	 * @param constraints input constraints, TextField.ANY for no constraints
	 * @param availableChoices a list of available texts for the user
	 * @param allowFreeTextEntry true when the user should be allowed to enter any text that does not match any existing choice
	 * @param appendChoice true when the selected choices should be appended to the text rather than replacing the text
	 * @param appendChoiceDelimiter the character that separates several selections, e.g. '\n' or ';' 
	 */
	public ChoiceTextField(String label, String text, int maxSize, int constraints, String[] availableChoices, boolean allowFreeTextEntry, boolean appendChoice, String appendChoiceDelimiter) {
		this(label, text, maxSize, constraints, availableChoices, allowFreeTextEntry, appendChoice, appendChoiceDelimiter, null);
	}
	
	/**
	 * Creates a new ChoiceTextField.
	 * 
	 * @param label the label
	 * @param text the current text
	 * @param maxSize the maximum size for the input
	 * @param constraints input constraints, TextField.ANY for no constraints
	 * @param availableChoices a list of available texts for the user
	 * @param allowFreeTextEntry true when the user should be allowed to enter any text that does not match any existing choice
	 * @param appendChoice true when the selected choices should be appended to the text rather than replacing the text
	 * @param appendChoiceDelimiter the character that separates several selections, e.g. "\n" or ";" or null. 
	 * @param style the style for this item
	 */
	public ChoiceTextField(String label, String text, int maxSize, int constraints, String[] availableChoices, boolean allowFreeTextEntry, boolean appendChoice, String appendChoiceDelimiter, Style style) {
		super(label, text, maxSize, constraints, style);
		this.choices = availableChoices;
		if (availableChoices != null) {
			this.lowerCaseChoices = new String[ availableChoices.length ];
			for (int i = 0; i < availableChoices.length; i++) {
				String choice = availableChoices[i];
				this.lowerCaseChoices[i] = choice.toLowerCase();
			}
			this.choiceItems = new Item[ availableChoices.length ];
		}
		this.isAllowFreeTextEntry = allowFreeTextEntry;
		this.choicesContainer = new Container( false );
		//#if polish.Container.allowCycling != false
			this.choicesContainer.allowCycling = false;
		//#endif
		//#if polish.usePolishGui
			//# this.choicesContainer.parent = this;
		//#endif	
		this.isAppendMode = appendChoice;
		this.appendChoiceDelimiter = appendChoiceDelimiter;
	}


	
	/**
	 * Sets the available choices.
	 * Use this method in conjunction with an ItemStateListener for using complex rules for creating choices.
	 * 
	 * @param choices the new choices, null when no choices are given
	 */
	public void setChoices( String[] choices ) {
		this.choicesContainer.clear();
		if  ( choices == null ) {
			this.choiceItems = new Item[ 0 ];
			openChoices( false );
			return;
		}
		this.choiceItems = new Item[ choices.length ];
		for (int i = 0; i < choices.length; i++) {
			String choiceText = choices[i];
			Item item = new ChoiceItem( choiceText, null, Choice.IMPLICIT, this.choiceItemStyle );
			this.choiceItems[i] = item;
			this.choicesContainer.add( item );
		}
		this.choices = choices;
		openChoices( choices.length > 0 );
	}
	
	
	/**
	 * Sets the available choices.
	 * Use this method in conjunction with an ItemStateListener for using complex rules for creating choices.
	 * The given items should implement the "toString()" method and return the correct string value for the text field.
	 * 
	 * @param choices the new choices, null when no choices are available
	 */
	public void setChoices( Item[] choices ) {
		this.choicesContainer.clear();
		if  ( choices == null ) {
			this.choiceItems = new Item[ 0 ];
			openChoices( false );
			return;
		}
		this.choiceItems = choices;
		for (int i = 0; i < choices.length; i++) {
			Item item = choices[i];
			this.choicesContainer.add( item );
		}
		openChoices( choices.length > 0 );
	}
	
	/**
	 * Sets the matching algorithm that is used for finding out whether an available choices matches the input of the user.
	 * 
	 * @param mode the matching mode, the default mode is ChoiceTextField.MATCH_STARTS_WITH, so the user input is compared with the start of the available choices. 
	 * @see #MATCH_STARTS_WITH
	 * @see #MATCH_INDEX_OF
	 * @see #setChoices(Item[]) for using complex matching rules
	 * @see #setChoices(String[]) for using complex matching rules
	 */
	public void setMatchMode( int mode ) {
		this.matchMode = mode;
	}
	
	/**
	 * Retrieves the matching algorithm that is used for finding out whether an available choices matches the input of the user.
	 * 
	 * @return the matching mode, the default mode is ChoiceTextField.MATCH_STARTS_WITH, so the user input is compared with the start of the available choices. 
	 * @see #MATCH_STARTS_WITH
	 * @see #MATCH_INDEX_OF
	 * @see #setChoices(Item[]) for using complex matching rules
	 * @see #setChoices(String[]) for using complex matching rules
	 */
	public int getMatchMode() {
		return this.matchMode;
	}



	/* (non-Javadoc)
	 * @see de.enough.polish.ui.TextField#defocus(de.enough.polish.ui.Style)
	 */
	protected void defocus(Style origStyle) {
		//#if polish.usePolishGui
			//# super.defocus(origStyle);
		//#endif
		if (!this.isAllowFreeTextEntry && this.numberOfMatches > 0) {
			Item item = this.choicesContainer.get( 0 );
			if (item instanceof StringItem) {
				setString( ((StringItem)item).getText() );
			} else {
				setString( item.toString() );
			}			
		}
		this.numberOfMatches = 0;
		this.choicesContainer.clear();
		openChoices(false);
	}
	
	

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.TextField#animate()
	 */
	public boolean animate() {
		//#if polish.usePolishGui
			//# boolean animated = super.animate();
		//#else
			boolean animated = false;
		//#endif
		if (this.numberOfMatches > 0) {
			animated |= this.choicesContainer.animate();
		}
		return animated;
	}

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.TextField#focus(de.enough.polish.ui.Style, int)
	 */
	protected Style focus(Style focStyle, int direction) {
		//#if polish.usePolishGui
			//# this.originalStyle = super.focus(focStyle, direction);
			//# this.focusingStyle = this.style;
		//#endif
		return this.originalStyle;
	}
	

	/* (non-Javadoc)
	 * @see de.enough.polish.ui.TextField#handleKeyPressed(int, int)
	 */
	protected boolean handleKeyPressed(int keyCode, int gameAction) {
		//#debug
		System.out.println("keyPressed( keyCode=" + keyCode + ", gameAction=" + gameAction +  ", isInChoice=" + this.isInChoice + " )");
		if (this.isInChoice) {
			if ( this.choicesContainer.handleKeyPressed(keyCode, gameAction) ) {
				//#debug
				System.out.println("keyPressed handled by choices container");
				return true;
			}
			//System.out.println("focusing textfield again, isFocused=" + this.isFocused);
			enterChoices( false );
			
			if (gameAction == Canvas.FIRE) {
				// option has been selected!
				Item item = this.choicesContainer.getFocusedItem();
				String choiceText;
				if ( item instanceof ChoiceItem ) {
					choiceText = ((ChoiceItem) item).getText();
				} else {
					choiceText = item.toString();
				}
				if (this.isAppendMode) {