inlinetag.java

FIRE (Flexible Interface Rendering Engine)是一个J2ME上的灵活的图形界面引擎

/*
 * Fire (Flexible Interface Rendering Engine) is a set of graphics widgets for creating GUIs for j2me applications. 
 * Copyright (C) 2006-2008 Bluevibe (www.bluevibe.net)
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 */

/**
 * 
 */
package gr.fire.browser;

import gr.fire.browser.util.Command;
import gr.fire.browser.util.Form;
import gr.fire.browser.util.Page;
import gr.fire.browser.util.StyleSheet;
import gr.fire.core.FireScreen;
import gr.fire.core.Theme;
import gr.fire.ui.ImageComponent;
import gr.fire.ui.InputComponent;
import gr.fire.util.Log;
import gr.fire.util.StringUtil;

import java.util.Vector;

import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.TextField;

import org.kxml2.io.KXmlParser;

/**
 * @author padeler
 *
 */
public class InlineTag extends Tag
{	
	public static final String TAG_A = "a";
	public static final String TAG_BR = "br";
	public static final String TAG_TD = "td";
	public static final String TAG_IMG = "img";
	public static final String TAG_SPAN = "span";
	public static final String TAG_B = "b";
	public static final String TAG_STRONG = "strong";
	public static final String TAG_I = "i";
	public static final String TAG_EM = "em";
	public static final String TAG_BIG = "big";
	public static final String TAG_SMALL= "small";
	public static final String TAG_TT= "tt";
	public static final String TAG_U= "u";
	public static final String TAG_CENTER= "center";
	
	
	
	public static final String TAG_INPUT = "input";
	public static final String TAG_LABEL= "label";
	public static final String TAG_SELECT = "select";
	public static final String TAG_OPTION = "option";
	public static final String TAG_BUTTON = "button";
	public static final String TAG_TEXTAREA= "textarea";
	
	
	private String name=TAG_NOTSET;
	
	
	public InlineTag()
	{
	}
	

	public String getName()
	{
		return name;
	}
	
	public void inherit(Tag parent)
	{
		if(parent!=null)
		{
			inheritStyle(parent); // inherit style information
			if(parent instanceof BlockTag) this.parentBlockTag = (BlockTag)parent;
			else this.parentBlockTag = parent.parentBlockTag;
		}
	}

	public void handleTagStart(Browser browser,Page page, KXmlParser parser)
	{
		name = parser.getName().toLowerCase(); // the name of the tag

		Tag parentElement = browser.topTag(); // may be a block element or an inline element
		
		inherit(parentElement); // first inherit from parents
		handleCommonAttributes(parser); // then get extra style from attributes

		if(TAG_A.equals(name))
		{
			// this is a link.
			String hrefLocation = parser.getAttributeValue(null,"href");
			if(hrefLocation!=null)
			{
				Theme th = FireScreen.getTheme();
				if(foregroundColor==th.getIntProperty("xhtml.fg.color")) // no change from style attribute, hack until DOM is implemented.
					foregroundColor = th.getIntProperty("link.fg.color");

				Font linkFont = th.getFontProperty("link.font");
				try{
					font = Font.getFont(font.getFace()|linkFont.getFace(),font.getStyle()|linkFont.getStyle(),font.getSize());
				}catch(Exception e)// failed to inherit font attributes.
				{font = linkFont;}

				listener = browser.listener;
				href = new Command("Link",Command.OK,1,hrefLocation);
			}
			return;
		}

		if(TAG_IMG.equals(name))
		{
			String imgLocation = parser.getAttributeValue(null,"src");
			String alt = parser.getAttributeValue(null,"alt");
			
			if(imgLocation!=null && parentBlockTag!=null)
			{
				int width= StyleSheet.calculateLenght(parser.getAttributeValue(null,"width"),parentBlockTag.containerWidth);
				int height=StyleSheet.calculateLenght(parser.getAttributeValue(null,"height"),FireScreen.getScreen().getHeight());
				
				Log.logDebug("Image Element ["+imgLocation+"]/["+alt+"]: "+width+","+height);

				Image image = page.getCachedImage(imgLocation);
				ImageComponent primitive= new ImageComponent(image,width,height,this.font,alt);
				if(image==null && browser.imageLoadingPolicy!=Browser.NO_IMAGES)
				{
					if(browser.imageLoadingPolicy==Browser.LOAD_IMAGES_ASYNC && width!=-1 && height!=-1)
					{
						page.registerAsyncImageRequest(primitive,imgLocation);
					}
					else // LOAD_IMAGES or width,height are not preset.
					{
						image = page.loadImage(browser.httpClient,imgLocation);
						if(image!=null) 
							primitive.setImage(image);
					}
				}
				copyStyle(primitive);
				parentBlockTag.handleComponent(this, primitive);
			}
			return;
		}
		
		if(TAG_BR.equals(name))
		{
			if(parentBlockTag!=null)
			{
				parentBlockTag.lineBreak(parentBlockTag.font.getHeight(),true);
			}
			return;
		}
		
		if(TAG_SPAN.equals(name) || TAG_TD.equals(name))
		{
			handleCommonAttributes(parser); // then get extra style from attributes
			handleAlignAttributes(parser);
			return;
		}
		
		if(TAG_B.equals(name) || TAG_STRONG.equals(name))
		{
			/*
			 * This is a B Inline Element. 
			 * As an inline Element i am inside a container. 
			 */
			font = Font.getFont(font.getFace(),font.getStyle()|Font.STYLE_BOLD,font.getSize());
			return;
		}
		
		if(TAG_I.equals(name) || TAG_EM.equals(name))
		{
			/*
			 * This is a I Inline Element. 
			 * As an inline Element i am inside a container. 
			 */
			font = Font.getFont(font.getFace(),font.getStyle()|Font.STYLE_ITALIC,font.getSize());
			return;
		}
		
		
		if(TAG_LABEL.equals(name))
		{
			
			// nothing to do for labels (ignore "for" attribute until proper DOM is implemented).
			return;
		}
		
		if(TAG_INPUT.equals(name) || TAG_BUTTON.equals(name))
		{
			Form openForm = page.getOpenForm();  
			if(openForm==null || parentBlockTag==null) // ignore input elements outside forms
			{
				return;
			}
			
			handleInputComponent(openForm,parser);
			
			return;
		}
		
		if(TAG_SELECT.equals(name))
		{
			Form openForm = page.getOpenForm();  
			if(openForm==null || parentBlockTag==null) // ignore input elements outside forms
			{
				return;
			}
						
			boolean multiple = parser.getAttributeValue(null,"multiple")!=null;
			boolean enabled = (parser.getAttributeValue(null,"disabled")==null);
			String name = parser.getAttributeValue(null,"name");
			gr.fire.browser.util.Command menuCommand = new gr.fire.browser.util.Command(name);
			menuCommand.setEnabled(enabled);
			menuCommand.setMultiple(multiple);
			
			String size = parser.getAttributeValue(null,"size");
			if(size!=null)
			{
				try{
					menuCommand.setSize(Integer.parseInt(size));
				}catch(NumberFormatException e)
				{
					Log.logWarn("Failed to parse size attribute",e);
				}
			}
			openForm.setMenuCommand(menuCommand);
			return;
		}
		
		if(TAG_OPTION.equals(name))
		{
			Form openForm = page.getOpenForm();  
			if(openForm==null || parentBlockTag==null) // ignore input elements outside forms
			{
				return;
			}
			
			gr.fire.browser.util.Command menu = openForm.getMenuCommand();
			String name=null;
			if(menu!=null) name = menu.getName();
			
			boolean enabled = (parser.getAttributeValue(null,"disabled")==null);
			boolean checked = (parser.getAttributeValue(null,"selected")!=null);
			
			String value= parser.getAttributeValue(null,"value");  
			
			// get the text of the option element
			int type;
			String text= "";
			try
			{
				type = parser.next();
				if(type==KXmlParser.TEXT) // text of option element
				{
					text = parser.getText();
					parser.next(); //progress the parsing once more since TEXT was handled here.
				}
			} catch (Exception e)
			{
				Log.logWarn("Failed to get text for tag "+name+".",e);
				return;
			}

			InputComponent option = new InputComponent(InputComponent.SWITCH);
			option.setLayout(FireScreen.VCENTER|FireScreen.CENTER);
			option.setChecked(checked);
			option.setEnabled(enabled);
			option.setName(name);
			option.setValue(value);
			option.setInitialValue(checked?"":null);
			option.setText(text);
			option.setMaxWidth(parentBlockTag.getContainerWidth());
			
			copyStyle(option);
			int []minSize = option.getMinSize();
			option.setPrefSize(minSize[0],minSize[1]);
			
			openForm.addInputComponent(option);
			return;
		}
		
		
		if(TAG_TEXTAREA.equals(name))
		{
			Form openForm = page.getOpenForm();  
			if(openForm==null || parentBlockTag==null) // ignore input elements outside forms
			{
				return;
			}
			
			String name = parser.getAttributeValue(null,"name");
			boolean enabled = (parser.getAttributeValue(null,"disabled")==null) && (parser.getAttributeValue(null,"readonly")==null);

			String rowsStr = parser.getAttributeValue(null,"rows");
			String colsStr = parser.getAttributeValue(null,"cols");
			String sizeStr = parser.getAttributeValue(null,"size");
			
			// get the text of this area
			int type;
			String value= "";
			try
			{
				type = parser.next();