设计可组建的j2me UI（五） List_J2ME

设计可组装的j2me UI（五） List
??????? 高级UI中的List控件对于广大应用来说是足够的。但有些特别需求的功能确不得不自己开发，比如实现没一行字体颜色不同，字体样式不同，还有排版等方面问题时候则要自己动手实现一个了。下面把我在项目中学习到得经验与大家分享下。
?????? 但是客户有个需求，说你这个List需要翻页，我要求输入什么键你进行上下翻页。我要求在每一行字体里面包含一些不同颜色得字，根据XP，好我拥抱需求。所以让我们来看下怎么修改程序得。
????? 注意在看这篇文章之钱，请稍微留意下在下得前面几篇文章。谢谢，^_^
????? 代码如下，我会加比较多得注释

java 代码

/********************************************************************?
?*??
?*?版权说明，此程序仅供学习参考。不能用于商业?
?*??
?********************************************************************/??
package?org.pook.ui;??
??
import?java.util.Vector;??
??
import?javax.microedition.lcdui.Graphics;??
import?javax.microedition.lcdui.Image;??
??
import?org.pook.ui.core.Platform;??
import?org.pook.ui.util.GraphicsUtil;??
???
??
/**?
?*?类名：List.java?
??
?*?编写日期:?2006-10-14?
?
?*?程序功能描述：实现Part部件，而获取可按照自己要求得效果得List
?
?*?Demo:?
?
?*?Bug:?
?
?*??
?*?程序变更日期?：
??
?*?变更作者?：
??
?*?变更说明?：
?
?*??
?*?@author?wuhua?
??
?*/??
public?class?List?extends?Part?{??
????Image?icon;??
????Vector?items;????????
????int?numOfEls;???
????int?paintSize;??
????int?space;??
????/**?开始索引?*?*/??
????private?int?startIndex;??
????
????public?List(Image?icon)?{??
????????super(0,?21,?Platform.WIDTH,?Platform.HEIGHT?-?41);??
????????this.icon?=?icon;??
????????items?=?new?Vector();??
???????????
????}??
???
?? /** 主要是根据屏幕变化而改变各个StringItem的位置跟当前屏幕可以显示StringItem的大小*?*/?
?
????public?void?changeViewAndSize(){??
????????if?(Platform.HEIGHT?-?20?>?view[HEIGHT])?{??
????????????view[HEIGHT]?=?Platform.HEIGHT?-?41;??
????????????space?=?font.getHeight()?+?2;??
????????????paintSize??=?view[HEIGHT]?/?space;??
????????}??
????}??
???
????public?void?append(Vector?items){??
????????if(items?==?null)??
????????????return;??
????????this.items?=?items;??
????????this.numOfEls?=?items.size();??
????}??
??
????public?void?append(String?stringItem){??
????????this.items.addElement(stringItem);??
????????this.numOfEls?=?items.size();??
????}??
??????
??????
????public?void?insert(String?stringItem){??
????????this.items.insertElementAt(stringItem,0);??
????????this.numOfEls?=?items.size();??
????}??
??????
????public?int?getSelectIndex(){??
????????return?this.selectIndex;??
????}??
??????
????public?String?getSelectString(){??
????????//System.out.println(this.numOfEls);??
????????return?(String)?this.items.elementAt(selectIndex+startIndex?);??
????}??
??????
????public?void?paint(Graphics?g)?{??
????????changeViewAndSize();??
????????GraphicsUtil.fillScreen(g,?this.bgColor,?view[X],?view[Y],?view[WIDTH],?view[HEIGHT]);??
????????paintStrings(g);??
????}??
??
????private?void?paintStrings(Graphics?g)?{??
??????
????????if?(items.size()?==?0)??
????????????return;??
????????int?size?=?this.paintSize?>?this.numOfEls??this.numOfEls:this.paintSize?+?startIndex;??
??????????
????????paintSelect(g,?view[Y]?+?space?*?selectIndex?+?2?);??
??????????
????????g.setColor(this.fontColor);??
??????????
????????for(int?i?=startIndex,j=0;?i<?size;?i++,?j++){??
???????????????
????????????String?it?=?(String)?items.elementAt(i);??????????
??????????????
????????????if(this.selectIndex?==?j){??
????????????????it?=?(String)?items.elementAt(selectIndex+startIndex);??
????????????????//this.select.paint(view[X],?height,?view[WIDTH],it.getItemHeight(),g);??
????????????}else{??
???????????????????
????????????}??
????????????GraphicsUtil.darwString(g,it,?view[X]?+?10,?view[Y]?+?space?*j?+?2);??
????????????//?变化的高度??
???????????????
????????}????
????}??
????private?void?paintSelect(Graphics?g,?int?height)?{??
????????g.setColor(0x909090);??
????????g.fillRect(view[X],?height,?view[WIDTH],?space);??
????}??
??
????public?void?onClick(int?keyCode)?{??
????????keyUpAndDown(keyCode);??
????}??
??
????/**?
?????*?内部实现按钮向上向下时候的动作,有具体类的keyPress调用.?
?????*??
?????*?@param?keyCode?
?????*/??
????void?keyUpAndDown(int?keyCode)?{??
????????if(this.numOfEls?==?0)??
????????????return;??
????????switch?(keyCode)?{??
??????
????????case?Platform.KEY_UP:?{??
????????????selectIndex--;??
???????????????
?????????break;??
????????????????
???????????????
????????}??
????????case?Platform.KEY_DOWN:?{??
????????????selectIndex++;??
???????????????
?????????????break;??
????????}??
????????}??
????????changeSelectIndex();??
????}??
??????
????/**?
?????*?判断当前选择条是否到了底部,经过用户的选择,这些选择条会不断的变化
?变化的依据是当selectPosition?>=?
?????*?viewPart[HEIGHT]*/??
????private?void?changeSelectIndex(){??
????????int?num?=?(this.paintSize?<?numOfEls)?paintSize:numOfEls;//取可显示的菜单项数目??
????????if?(selectIndex>num-1)??
????????{??
????????????startIndex++;??
????????????selectIndex=(byte)(num-1);??
????????}??
??????????
????????if?(selectIndex?<?0)??
????????{??
????????????if?(startIndex>0)??
????????????{??
????????????????selectIndex?=0;??
????????????????startIndex--;??
????????????}??
????????????else??
????????????{??
????????????????startIndex?=?numOfEls-num;??
????????????????selectIndex=num-1;??
????????????}??
??????????????
????????}??
????????if?(startIndex+?selectIndex?>?numOfEls?-1)??
????????{??
????????????startIndex=?0;??
????????????selectIndex?=?0;??
????????}??
????}??
??
}??

1 楼为你而来 2006-11-22

强人，多谢啦!!

2 楼 ouspec 2006-11-22

恩，不错