blocktag.java

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/*
 * 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.PageMetaData;
import gr.fire.browser.util.XmlPullParser;
import gr.fire.core.Component;
import gr.fire.core.Container;
import gr.fire.core.FireScreen;
import gr.fire.core.Theme;
import gr.fire.ui.ImageComponent;
import gr.fire.ui.TextComponent;
import gr.fire.util.Log;

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

/**
 * @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_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 = new Container();
	protected int containerWidth; // the width of this container. It is either inherited by the parent or set by attributes
		
	public BlockTag()
	{
		Theme th = FireScreen.getTheme();
		font = th.defaultFont;
		backgroundColor = th.componentBackgroundColor;
		foregroundColor = th.componentForegroundColor;
	}
	
	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, XmlPullParser 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

			lineBreak(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);
			
			lineBreak(font.getHeight(),true);			
		}
		else if(TAG_FORM.equals(name))
		{
			inherit(parentElement,true); // first inherit from parents
			handleCommonAttributes(parser); // then get extra style from attributes
			lineBreak(font.getHeight(),true);			

			String action = parser.getAttributeValue("action");
			String method = parser.getAttributeValue("method");
			String enctype = parser.getAttributeValue("enctype");
			if(method==null || method.toLowerCase().toLowerCase().equals("get")) method = HttpConnection.GET;
			else method = HttpConnection.POST;
			
			Form newForm = new Form(browser,action,method,enctype);
			// set the new form to the parent.
			browser.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(),true);			
		}
		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

			lineBreak(font.getHeight(),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(),true);
			browser.setPageContainer(elementContainer);
		}
		else if(TAG_SCRIPT.equals(name) || TAG_STYLE.equals(name))
		{ // consume 
			int type= parser.next();
			Log.logInfo("<"+name+">");
			//Log.logInfo(parser.getText());
			Log.logInfo(".....Skipped.....");
			Log.logInfo("</"+name+">");
			return;
		}
		else if(TAG_META.equals(name))
		{
			PageMetaData meta = browser.getPageMetaData();
			meta.parseMetaTag(parser);
			return;
		}
		else if(TAG_TITLE.equals(name))
		{
			parser.next();
			PageMetaData meta = browser.getPageMetaData();
			meta.setPageTitle(parser.getText());
			return;
		}
		
		copyStyle(elementContainer);
		elementContainer.setId(tagId);
	}

	public void handleTagEnd(Browser browser, XmlPullParser parser)
	{
		String name = getName();

		if(TAG_P.equals(name))
		{
			int baseLine = getBaseLine();
			/*
			 * This the end of a P Element. 
			 * As a container i will have a new line before and a new line after my content
			 */
			if(parentBlockTag!=null)
			{// update pointer position of parent
				parentBlockTag.lineBreak(baseLine,true);
			}
			
			elementContainer.setPrefSize(containerWidth,baseLine,false);
			
			return;
		}
		
		if(TAG_DIV.equals(name) || TAG_TABLE.equals(name) || TAG_H1.equals(name) || TAG_H2.equals(name) || TAG_H3.equals(name) || TAG_H4.equals(name) || TAG_H5.equals(name) || TAG_H6.equals(name))
		{
			
			if(parentBlockTag!=null)
			{// update pointer position of parent
				parentBlockTag.lineBreak(getBaseLine(),true);
			}
			elementContainer.setPrefSize(containerWidth,getBaseLine(),false);
			return;
		}
		
		if(TAG_FORM.equals(name))
		{
			
			if(parentBlockTag!=null)
			{// update pointer position of parent
				parentBlockTag.lineBreak(getBaseLine(),true);
			}
			elementContainer.setPrefSize(containerWidth,getBaseLine(),false);
			browser.setOpenForm(null);
			return;
		}
		
		if(TAG_HR.equals(name))
		{
			// prepare the hr image
			Image hrImage = Image.createImage(containerWidth,font.getHeight());
			Graphics g = hrImage.getGraphics();
			g.setColor(foregroundColor);
			g.drawLine(0,font.getHeight()/2,containerWidth,font.getHeight()/2);
			ImageComponent imCmp = new ImageComponent(hrImage,-1,-1,this.font,"");
			copyStyle(imCmp);
			handleComponent(this,imCmp); // add the hr image in the container.
			
			int baseLine = getBaseLine();
			
			if(parentBlockTag!=null)
			{// update pointer position of parent
				parentBlockTag.lineBreak(baseLine,true);
			}
			
			elementContainer.setPrefSize(containerWidth,baseLine,false);
			
			return;
		}
		
		if(TAG_BODY.equals(name))
		{
			elementContainer.setPrefSize(containerWidth,getBaseLine(),false);
			return;
		}
	}
	
	
	private void handleHeaderTagStart(Tag parentElement,XmlPullParser parser, Font font)
	{
		inherit(parentElement,true); // first inherit from parents
		handleCommonAttributes(parser); // then get extra style from attributes
		handleAlignAttributes(parser);
		this.font = font;
		lineBreak(font.getHeight(),true);
	}
	
	public void handleText(Tag topLevelTag, String txt)
	{
		if(this.getName().equals(TAG_P)==false && txt.trim().length()==0) // ignore empty strings outside a paragraph.
			return;
		
		if(getBaseLine()==0) // first line of text
		{
			lineBreak(topLevelTag.getLineHeight(),true);
		}
		// add a text element 
		int vw = containerWidth;
		
		TextComponent el = new TextComponent(txt,vw,pointerX);
		topLevelTag.copyStyle(el);
		el.validate();

		int fontHeight = topLevelTag.font.getHeight();
		
		// update other primitives on the same line to have the correct height.
		updatePrimitivesInLineForPrimitiveHeight(fontHeight);

		
		el.setX(0); // start from the left side of the block element
		el.setY(getBaseLine()-fontHeight);

		int lastLineWidth = el.getLastLineWidth();
		int contentHeight = el.getContentHeight();

		el.setPrefSize(vw,contentHeight,false);
		elementContainer.add(el);

		int lineCount = el.getFormatedText().size();
//		Log.logInfo("("+getName()+")->("+topLevelTag.getName()+")==["+lastLineWidth+"]====["+txt+"]====["+baseLine+"]====["+lineCount+"]=====>"+pointerX);
		if(lineCount==1)
		{
			// baseline is the same.
			pointerX += lastLineWidth;
			if(pointerX>=vw)
			{// line break
				lineBreak(topLevelTag.getLineHeight(),false);
			}
		}
		else if(lineCount>1)
		{
			lineBreak((contentHeight-el.getLastLineHeight()),true);
			pointerX = lastLineWidth;
		}
		
		el.setId(topLevelTag.tagId);
		
		return;
	}
	
	public void handleComponent(Tag topLevelTag, Component primitive)
	{
		if(getBaseLine()==0) // first line of text
		{ 
			lineBreak(topLevelTag.font.getHeight(),true);
		}
		// add a text element 
		int vw = containerWidth;

		Component el = primitive;
		el.validate();

		int d[] = el.getPrefSize();
		int w = d[0];
		int h = d[1];
		
		if(pointerX>0 && pointerX+w>vw)
		{
			lineBreak(topLevelTag.font.getHeight(),false);
		}
		
		// update other primitives on the same line to have the correct height.
		updatePrimitivesInLineForPrimitiveHeight(h);

		el.setX(pointerX); 
		el.setY(getBaseLine()-h);
		elementContainer.add(el);
		// update the pointetX,pointerY.
		pointerX += w;

		if(pointerX>=vw)
		{ // line break
			lineBreak(topLevelTag.font.getHeight(),false);
		}	
		
		el.setId(topLevelTag.tagId);
		
		return;
	}
	
	private void updatePrimitivesInLineForPrimitiveHeight(int primitiveHeight)
	{
		int baseLine = getBaseLine();

		int lineHeight = getLineHeight();
		if(primitiveHeight>lineHeight) // there may be a component on my left that need rearangement
		{ // the new lineHeight will be primitiveHeight and the base line will move lower.
			for(int i=elementContainer.countComponents()-1;i>=0;--i) // yes there is at least one.
			{
				Component primitive = (Component)elementContainer.getComponent(i);
				
				if((primitive.getY()+primitive.getContentHeight())!=baseLine) 
				{ // done, this primitive ends above current location.
					break;
				}
				
				if(primitive instanceof TextComponent)
				{
					TextComponent tp = (TextComponent)primitive;
					int lastLineExtraHeight = tp.getLastLineExtraHeight() + (primitiveHeight-lineHeight);
					tp.setLastLineExtraHeight(lastLineExtraHeight);
					int []d = tp.getPrefSize();
					tp.setPrefSize(d[0],d[1]+lastLineExtraHeight,false);
				}
				else if(primitive instanceof ImageComponent)
				{
					ImageComponent ip = (ImageComponent)primitive;
					ip.setY(ip.getY()+ (primitiveHeight-lineHeight));
				}
			}
			setBaseLine(baseLine +(primitiveHeight-lineHeight));
			setLineHeight(primitiveHeight);
		}
		
	}
	

	public int getContainerWidth()
	{
		return containerWidth;
	}
}