browser.java

手机程序

            // 尝试从缓冲池中加载图片
            CacheObject obj = cache.getCookiesObject(s);
            // 如果缓冲池中没有图片,则通过HTTP请求下载
            if (obj == null) {
            	buffer = HttpConnector.sendHttpRequest(new HttpRequest(s,"GET",null,null),
                		null,this);
                if (s.indexOf('?') == -1) {
                	// 将图片内容保存缓冲池
                	cache.setCache(s,HttpConnector.lastContentType, buffer);
                }
                type = HttpConnector.lastContentType;
            } else {
            	// 否则直接使用缓冲池中的图片
            	buffer = obj.buffer;
                type = obj.contentType;
            }
            if(type!=null && buffer!=null){
            	
            	// png
            	if(type.toLowerCase().indexOf("image/png")!=-1){
            		image = Image.createImage(buffer,0,buffer.length);
            	}
            	
            	// gif
            	else if(type.toLowerCase().indexOf("image/gif")!=-1){
            		GifFrame GF = GifFrame.CreateGifImage(buffer);
            		if(GF!=null || GF.size()>0){
            			image = GF.getImage();
            		}
            	}
            	
            	// midp1.0不支持jpeg格式的图片
            	//#if (!MIDP1 || !SUPPORT_JPEG)
            	else if(type.toLowerCase().indexOf("image/jpeg")!=-1){
            		image = Image.createImage(buffer,0,buffer.length);
            	}
            	//#endif
            	
            }
            // 如果图片加载不成功,则返回"无法显示"的图片
            if(image==null){
            	return noneImage;
            }else{
            	return image;
            }
        } catch (Exception e) {
        	e.printStackTrace();
            return null;
        }
    }
	
    /**
     * 加载CSS层叠样式列表
     * @param s
     * @return
     */
    Hashtable loadCss(String s){
    	try{
    		byte[] buffer;
    		// 首先尝试从cache中获得,如果没有,则从服务器加载
    		if((buffer = cache.getCache(s)) == null){
    			buffer = HttpConnector.sendHttpRequest(new HttpRequest(s,"GET",null,null),
    					null, this);                
    			// 加载完毕应该先保存在cache中,方便下一次刷新该页面时不用从服务器加载
                cache.setCache(s,HttpConnector.lastContentType, buffer);
    		}                        
            ByteArrayInputStream bais = new ByteArrayInputStream(buffer);
            InputStreamReader isr = new InputStreamReader(bais);
            // css样式被保存在hashtable中
            Hashtable ht = new Hashtable();
            String tmpName = "";
            Vector tmpVector = null;
        	String str = "";
        	
//        	body {
//        		margin: 0px;
//        		font-size: 12px;
//        		background-color: #F7FFDE;
//        	}
//        	.idxgamebar {
//        		background-color: #4A9C00;
//        		height: 18px;
//        		margin-top: 5px;
//        		background-image: url(../img/idx_titlebk.gif);
//        	}
//
//        	.topbar {
//        		background-color: #006600;
//        		color: #FFFFFF;
//        		padding: 3px;
//        		overflow: hidden;
//        	}.menudiv {
//        		background-color: #E6FFA5;
//        		padding-top: 5px;
//        		padding-bottom: 5px;
//        		padding-right: 1px;
//        		padding-left: 1px;
//        		height: 25px;
//        	}
//        	.menubut {
//        		margin-right: 2px;
//        		margin-left: 2px;
//        		float: left;
//        	}
//        	.sizebox {
//        		align:center;
//        		width: 175px;
//        		margin: 0px;
//        		padding: 0px;
//        		overflow: hidden;
//        		text-align: center;
//        	}
//        	.gameimg {
//        		margin-top: 5px;
//        		padding-left: 5px;
//        	}
//        	.busbar {
//        		text-align: center;
//        	}
//
//        	.copy {
//        		width:175px;
//        		padding-top: 10px;
//        		padding-left: 10px;
//        		padding-right: 10px;
//        		text-align: center;
//        	}
//
//        	.gametitle {
//        		background-color: #FCD621;
//        		background-image: url(../img/bk_game.gif);
//        		margin-top: 5px;
//        		height: 10px;
//        	}
//        	a {
//        		color: blue;
//        		text-decoration: none;
//        	}
//
//        	.downlink {
//        		color: #FF0000;
//        		text-decoration: none;
//        	}
//
//        	.floatleft {
//        		margin: 0px;
//        		padding: 0px;
//        		overflow: hidden;
//        		text-align: left;
//        	}
//
//        	.main {
//        	}
//
//        	.nobreak{
//        		padding-top: 10px;
//        	}
//
//
//        	.timebar {
//        		text-align:center;
//        		width:175px;
//        		padding-top: 0px;
//        		padding-left: 10px;
//        	}
//
//        	input {
//        		font-size: 12px;
//        	}
        	
        	// 以上为CSS文件内容可能的格式
        	
            do{
            	if(str.length()==0){
            		if((str = Tools.ReadLine(isr))==null) break;
                	str = Tools.RepString(str," ","").trim();
            	}            	
            	if(str.length()>0){
            		// 一段CSS定义结束
            		if(str.charAt(0)=='}'){
            			if(tmpVector!=null){
                    		ht.put(tmpName,tmpVector);
                    		tmpName="";
                    		tmpVector = null;
            			}
            			str = str.substring(1);
            			continue;
                	}else 
                	// 一段CSS定义开始
                	if(str.charAt(str.length()-1)=='{'){
                		str = str.substring(0,str.length()-1);
                		if(str.length()>0){
                			if(str.charAt(0)=='.'){
                				str = str.substring(1);
                			}
                			//#if DEBUG
                			//# System.out.println("["+str+"]");
                			//#endif
                			tmpName = str;
                			tmpVector = new Vector();
                		}
                		str = "";
                	}else{
                		tmpVector.addElement(str);
                		str = "";
                	}
            	}
            }while(true);
            return ht;
    	}catch(Exception e){
    		e.printStackTrace();
    		return null;
    	}
    }
	
	/**
	 * 当browser作为一个插件时,可供外部调用的方法,向上滚动浏览器
	 */
	public void scrollUp(){
		wapRender.scrollUp();
	}
	
	/**
	 * 当browser作为一个插件时,可供外部调用的方法,向下滚动浏览器
	 */
	public void scrollDown(){
		wapRender.scrollDown();
	}
	
	Displayable browserDisplayable;
	
	/**
	 * 当browser作为一个插件时,可供外部调用的方法,处理选中的元素
	 */
	public void dealHotSpot(){
		// 页面解释中不允许请求其它新页面(只能上下查看页面)		
		if(loadStep == LOAD_STEP_PARSER) return;
		
		HotSpot hotspot = wapRender.getHotSpot();
		if(hotspot == null) return;
		
		switch(hotspot.type){
		case Element.NORMAL_TEXT:
		case Element.NORMAL_IMAGE:
		{
			// 直接发送一个请求
			String url = hotspot.url;
			if(url!=null){
				// 检查是否是一些do命令
				if(url.equals("prev")){
					back();
				}else{
					request(getUrl(hotspot.url));
				}
			}
		}
			break;
		case Element.TEXT_INPUT:
		case Element.PASSWORD_INPUT:
		{
			formElement = (FormElement)hotspot.obj;
			String name = formElement.getName();
			String value = formElement.getValue();
			if(value==null) value = "";
			int maxLength = formElement.getMaxLength();
			if(hotspot.type == Element.PASSWORD_INPUT){
				inputTextBox = new TextBox(name,value,maxLength, TextField.PASSWORD);
			}else{
				inputTextBox = new TextBox(name,value,maxLength,TextField.ANY);
			}
			inputTextBox.addCommand(inputOk);
			inputTextBox.addCommand(inputBack);
			inputTextBox.setCommandListener(this);
			browserDisplayable = display.getCurrent();
			display.setCurrent(inputTextBox);
		}
			break;
		case Element.SELECT_EXCLUSIVE:
		case Element.SELECT_MULTIPLE:
		{
			Select select = (Select)hotspot.obj;
			Vector labels = select.labels;
			selectList = new List(select.getName(),
					(hotspot.type==Element.SELECT_EXCLUSIVE?List.EXCLUSIVE:List.MULTIPLE));
			for(int i=0;i<labels.size();i++){
				selectList.append((String)labels.elementAt(i), null);
				if(hotspot.type == Element.SELECT_MULTIPLE){
					selectList.setSelectedIndex(i,select.getSelectedState(i));
				}
			}
			selectList.addCommand(inputOk);
			selectList.addCommand(inputBack);
			selectList.setCommandListener(this);
			browserDisplayable = display.getCurrent();
			display.setCurrent(selectList);
			formElement = select;
		}
			break;
		case Element.BUTTON:
		{
			Button button = (Button)hotspot.obj;
			// 获得一个表单提交请求
			HttpRequest httpRequest = button.getHttpRequest();
			// 提交表单			
			request(httpRequest);
		}
			break;
		case Element.ANCHOR:
		{
			Anchor anchor = (Anchor)hotspot.obj;
			if(anchor!=null){
				String parm = anchor.getAnchorString();
				String method = anchor.getMethod();
				String url = anchor.getHref();				
				if(url==null || url.equals("")) url = curRequest.getUrl();
				url = getUrl(url);
				if(method.equals(HttpConnection.GET)){
					// get方法
					request(url + "?" + parm);
				}else{
					try{
						// post方法
						HttpRequest req = new HttpRequest(url,HttpConnection.POST,parm.getBytes(encoding),null);
						request(req);
					}catch(Exception e){
						e.printStackTrace();
					}
				}
			}
		}
			break;
		}
	}
	
	private FormElement formElement;
	
	public void commandAction(Command c,Displayable d){
		if(c == inputOk){
			if(formElement instanceof Input){
				formElement.setValue(inputTextBox.getString());
				inputTextBox = null;
			}else if(formElement instanceof Select){
				Select select = (Select)formElement;
				if(select.type == Element.SELECT_EXCLUSIVE){
					formElement.setValue(selectList.getSelectedIndex()+"");					
				}else{
					int size = selectList.size();
					boolean b[] = new boolean[size];
					selectList.getSelectedFlags(b);
					for(int i=0;i<size;i++){
						if(b[i]!=select.getSelectedState(i)){
							select.changeSelected(i);
						}
					}
					select.showSelected();
				}
				selectList = null;
			}
			display.setCurrent(browserDisplayable);
			formElement = null;
			browserDisplayable = null;
		}else if(c == inputBack){
			display.setCurrent(browserDisplayable);
			formElement = null;
			browserDisplayable = null;
		}
	}
	
    public int strWidth(String s) {
        return font.stringWidth(s);
    }
	
    public void drawBoldString(Graphics g, String s, int x, int y,int anchor) {
        g.drawString(s, x, y, anchor);
        g.drawString(s, x + 1, y, anchor);
    }
    
	public void paint(Graphics g){
		g.setFont(font);
		g.translate(x, y);
		
		wapRender.render(g);
		
		g.setClip(0,0,width,height);		
		if(loadStep == LOAD_STEP_CONTENT){
			paintLoadContentScreen(g);
		}else if(loadStep == LOAD_STEP_PARSER){
			paintParserScreen(g);			
		}
		
		g.translate(-x,-y);
	}
	
	private void paintLoadContentScreen(Graphics g){        
		int w = width;
		int h = fontHeight+2;
		int x = 0;
		int y = height - h;
		
        g.setColor(0x808080);
        g.fillRect(x, y, w, h);
        
        g.setColor(0x000000);
        drawBoldString(g, " 连接中...", x+2, y+1, 20);
	}
	
	private int maxElementNum = 0;
	
	/**
	 * 加载图片时屏幕下边显示的进度条
	 * @param g
	 */
	private void paintParserScreen(Graphics g){
		
		int w = width;
		int h = fontHeight+2;
		int x = 0;
		int y = height - h;
		
		int curLoaded = 0;
		int value = 0;
		int iPercent = 0;
		
		if(maxElementNum!=0){
			curLoaded = wapRender.getCurLoadedTag();
			value = curLoaded * 100 / maxElementNum;
	        iPercent = (curLoaded * (w - 2)) / maxElementNum;
		}
		
		g.setColor(0x808080);
        g.fillRect(x, y, w, h);
		
        g.setColor(0x0000ff);
        g.fillRect(x + 1, y + 1, iPercent - 2, h - 1);
        
        g.setColor(0xffffff);
        g.drawString("加载中..." + value+"%", 
        		width>>1, y + 1, Graphics.TOP|Graphics.HCENTER);
	}
	
	/**
	 * 清空browser可能占用的内存<br>
	 * 当从browser切换到游戏界面前,务必做此操作
	 */
	public void destroy(){
		try{
			historyUrl.removeAllElements();
			
			wapRender.destory();
			cookies.clear();
			Tools.destroy();
			HttpConnector.destroy();
			
			historyUrl = null;
			noneImage = null;
			curRequest = null;
			wapRender = null;
			cookies = null;
			browserDisplayable = null;
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	
}