blocktag.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.Form;
import gr.fire.browser.util.Page;
import gr.fire.core.Component;
import gr.fire.core.Container;
import gr.fire.core.FireScreen;
import gr.fire.ui.ImageComponent;
import gr.fire.ui.TextComponent;
import gr.fire.util.Log;
import gr.fire.util.StringUtil;

import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

import org.kxml2.io.KXmlParser;

/**
 * @author padeler
 *
 */
public class BlockTag extends Tag
{
	public static final String TAG_HTML = "html";
	public static final String TAG_HEAD = "head";
	public static final String TAG_TITLE = "title";
	public static final String TAG_META = "meta";
	public static final String TAG_BODY = "body";	
	public static final String TAG_STYLE = "style";
	public static final String TAG_P = "p";
	public static final String TAG_DIV = "div";
	public static final String TAG_HR = "hr";
	public static final String TAG_TABLE = "table";
	public static final String TAG_TR = "tr";
	public static final String TAG_H1 = "h1";
	public static final String TAG_H2 = "h2";
	public static final String TAG_H3 = "h3";
	public static final String TAG_H4 = "h4";
	public static final String TAG_H5 = "h5";
	public static final String TAG_H6 = "h6";
	
	public static final String TAG_SCRIPT = "script";
	public static final String TAG_FORM = "form";
	
	protected Container elementContainer;
	protected int containerWidth; // the width of this container. It is either inherited by the parent or set by attributes
		
	public BlockTag()
	{
		elementContainer = new Container();
		font = FireScreen.getTheme().getFontProperty("font");
	}
	
	public void inherit(Tag parent, boolean softLineBreak)
	{
		if(parent!=null)
		{
			inheritStyle(parent); // inherit style information
			if(parent instanceof BlockTag) this.parentBlockTag = (BlockTag)parent;
			else this.parentBlockTag = parent.parentBlockTag;
		}
		
		if(parentBlockTag!=null)
		{
			parentBlockTag.elementContainer.add(elementContainer);
			if(softLineBreak)
				parentBlockTag.lineBreak(parentBlockTag.font.getHeight(),false);

			elementContainer.setX(parentBlockTag.getPointerX());
			elementContainer.setY(parentBlockTag.getBaseLine()-parentBlockTag.getLineHeight());
			containerWidth = parentBlockTag.getContainerWidth()-parentBlockTag.getPointerX();
		}
	}
	
	public void handleTagStart(Browser browser,Page page, KXmlParser parser)
	{
		String name = parser.getName().toLowerCase(); // the name of the tag
		setName(name);
		
		Tag parentElement = browser.topTag(); // may be a block element or an inline element
		
		if(TAG_P.equals(name))
		{
			/*
			 * This is a P Element. 
			 * As a container i will have a new line before and a new line after my content
			 */
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes

			if(parentBlockTag!=null) parentBlockTag.lineBreak(parentBlockTag.font.getHeight(),true); // paragraph starts with line break.
			
		}
		else if(TAG_DIV.equals(name))
		{
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes
			handleAlignAttributes(parser);
		}
		else if(TAG_FORM.equals(name))
		{
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes
			lineBreak(font.getHeight(),false);			

			String action = parser.getAttributeValue(null,"action");
			String method = parser.getAttributeValue(null,"method");
			String enctype = parser.getAttributeValue(null,"enctype");
			if(method==null || method.toLowerCase().toLowerCase().equals("get")) method = HttpConnection.GET;
			else method = HttpConnection.POST;
			
			Form newForm = new Form(browser,action,method,enctype);
			if(browser.listener!=null) newForm.setFormListener(browser.listener);
			// set the new form to the parent.
			page.setOpenForm(newForm);
			
		}
		else if(TAG_TABLE.equals(name))
		{
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes
			handleAlignAttributes(parser);
			lineBreak(font.getHeight(),false);			
//			elementContainer.setLayoutManager(new BoxLayout(BoxLayout.Y_AXIS));
		}
		else if(TAG_TR.equals(name))
		{
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes
			handleAlignAttributes(parser);
			lineBreak(font.getHeight(),true);			
//			elementContainer.setLayoutManager(new BoxLayout(BoxLayout.X_AXIS));
		}
		
		else if(TAG_H1.equals(name))
		{
			handleHeaderTagStart(parentElement,parser,Font.getFont(font.getFace(),Font.STYLE_BOLD,Font.SIZE_LARGE));
		}
		else if(TAG_H2.equals(name))
		{
			handleHeaderTagStart(parentElement,parser,Font.getFont(font.getFace(),Font.STYLE_BOLD|Font.STYLE_ITALIC,Font.SIZE_LARGE));
		}		
		else if(TAG_H3.equals(name))
		{
			handleHeaderTagStart(parentElement,parser,Font.getFont(font.getFace(),Font.STYLE_BOLD,Font.SIZE_MEDIUM));
		}
		else if(TAG_H4.equals(name))
		{
			handleHeaderTagStart(parentElement,parser,Font.getFont(font.getFace(),Font.STYLE_BOLD,Font.SIZE_SMALL));
		}
		else if(TAG_H5.equals(name) || TAG_H6.equals(name))
		{
			handleHeaderTagStart(parentElement,parser,Font.getFont(font.getFace(),Font.STYLE_PLAIN,Font.SIZE_MEDIUM));
		}
		else if(TAG_HR.equals(name))
		{
			/*
			 * This is a HR (Horizontal ruler) Element. 
			 * It will have a new line before and a new line after it.
			 */
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes
			if(parentBlockTag!=null)
				parentBlockTag.lineBreak(parentBlockTag.font.getHeight(),false);
			
			lineBreak(font.getHeight()/2,true); // insert a line break.			
		}
		else if(TAG_BODY.equals(name))
		{
			// body starts at the top left corner of the page.
			handleCommonAttributes(parser); // then get extra style from attributes
			handleColorAttributes(parser);
			
			containerWidth = browser.getViewportWidth();
			lineBreak(font.getHeight(),false);
			copyStyle(elementContainer);
			elementContainer.setId(tagId);
			//elementContainer.setBackgroundColor(Component.); // overide default transparent color. (should change when default CSS is implemented)
			page.setPageContainer(elementContainer);
			return;
		}
		else if(TAG_SCRIPT.equals(name) || TAG_STYLE.equals(name))
		{ // consume 
			Log.logDebug("<"+name+">");
			//Log.logDebug(parser.getText());
			Log.logDebug(".....Skipped.....");
			Log.logDebug("</"+name+">");
			return;
		}
		else if(TAG_META.equals(name))
		{
			page.parseMetaTag(parser);
			return;
		}
		else if(TAG_TITLE.equals(name))
		{
			try{
				int type = parser.next();
				if(type==KXmlParser.TEXT)
				{
					page.setPageTitle(parser.getText().trim());
					parser.next(); // progress the parsing once more since TEXT was handled here.
				}
			}catch(Exception e){
				Log.logWarn("Failed to parse page title.",e);
			}
			return;
		}
		
		copyStyle(elementContainer);
		elementContainer.setId(tagId);
	}

	public void handleTagEnd(Browser browser,Page page, KXmlParser parser)
	{
		String name = getName();

		if(TAG_P.equals(name))
		{
			
			int baseLine =getBaseLine();
			/*
			 * This the end of a P Element.