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设计可组建的j2me UI（六） Dialog(对话框）

日期：2014-05-20　 浏览次数：20899 次

设计可组装的j2me UI（六） Dialog(对话框）
? ? ? 高级UI提供了一个Alert的控件可以有弹出对话框的效果。但是大家想不想自己实现一个呢。想不想知道sun是如何让Alert工作的呢？好请看下文
???? 设计思想是。建立一个 abstract?? class Dialog extends Canvas。下面的事情就让我们一步步花出来吧。
???? 实现理念是先绘制整个Canvas然后通过图形Graphics描绘成透明，接着在整个屏幕的中间去出一块区域来，至于上面你要做什么那就是你的事情了。哈。
??? 好看代码，
java 代码
?
  1. /********************************************************************?
  2. ?*??
  3. ?*?版权说明，此程序仅供学习参考。不能用于商业?
  4. ?*??
  5. ?********************************************************************/??
  6. package?org.pook.ui.form;??
  7. ??
  8. import?java.util.TimerTask;??
  9. ??
  10. import?javax.microedition.lcdui.Canvas;??
  11. import?javax.microedition.lcdui.Display;??
  12. import?javax.microedition.lcdui.Font;??
  13. import?javax.microedition.lcdui.Graphics;??
  14. ??
  15. import?org.pook.log.Log;??
  16. import?org.pook.ui.Command;??
  17. import?org.pook.ui.SoftButton;??
  18. import?org.pook.ui.core.Platform;??
  19. import?org.pook.ui.event.CommandListener;??
  20. import?org.pook.ui.timer.TimerTaskManager;??
  21. ??
  22. ???
  23. ??
  24. /**?
  25. ?*?类名：Dialog.java?
    ?编写日期:?2006-9-16?
    ?
  26. ?*?程序功能描述：弹出窗??,因为足球项目要求很多的弹出窗口的形式不同?????定义??个抽象的弹出窗口,把基本的功能再这个实??,以下的???么绘制则交给具体的要求?
  27. ?*?
    ?Demo:?
    ?Bug:?
    ?
  28. ?*??
  29. ?*?程序变更日期???
    ?变更作??????
    ?变更说明???
    ?
  30. ?*??
  31. ?*?@author?wuhua?
    ?    ?
  32. ?*/??
  33. public?abstract???class?Dialog?extends?Canvas?implements?Runnable?{??
  34. ????private?static?Log?log?=?Log.getLog("Dialog");??
  35. ??
  36. ????protected?final?int?X?=?0;??
  37. ??
  38. ????protected?final?int?Y?=?1;??
  39. ??
  40. ????protected???final?int?WIDTH?=?2;??
  41. ??
  42. ????protected?final?int?HEIGHT?=?3;??
  43. ??
  44. ????/**?显示主要部分.比如菜单的Icon,List的数据的位置?*/??
  45. ????protected?int[]?view?=?new?int[4];??
  46. ??
  47. ????/**?Preset?alternative?containing?OK?*/??
  48. ????public?static?final?int?DIALOG_OK?=?0;??
  49. ??
  50. ????/**?Preset?alternative?containing?CANCEL?=?1?*/??
  51. ????public?static?final?int?DIALOG_CANCEL?=?2;??
  52. ??
  53. ????/**?Preset?alternatives?containing?YES?and?NO?*/??
  54. ????public?static?final?int?DIALOG_YES_NO?=?3;??
  55. ??
  56. ????/**?Preset?alternatives?containing?OK?and?CANCEL?*/??
  57. ????public?static?final?int?DIALOG_OK_CANCEL?=?4;??
  58. ??
  59. ????/**?Preset?alternatives?containing?YES,?NO,?and?CANCEL?*/??
  60. ????public?static?final?int?DIALOG_YES_NO_CANCEL?=?5;??
  61. ??
  62. ????public?static?final?int?DIALOG_TEXT?=?6;??
  63. ??
  64. ????/**?
  65. ?????*?保存当前窗口,主要用???是,当前对话筐消失的时???,要求重绘??.?永远刷新父类?
  66. ?????*/??
  67. ????protected?Panel?parent;??
  68. ??
  69. ????protected?boolean?hasFocus;??
  70. ??
  71. ????/**?
  72. ?????*?定义超时参数?
  73. ?????*/??
  74. ????long?timeOut;??
  75. ??
  76. ????/**?
  77. ?????*?对话框类???
  78. ?????*/??
  79. ????int?type;??
  80. ??
  81. ????/**?对话框标???*/??
  82. ????protected?String?title;??
  83. ??
  84. ????/**?
  85. ?????*?把单行标题转换为多行以方便显???
  86. ?????*/??
  87. ????protected???String[]?rowTitle;??
  88. ??
  89. ????protected?int?bgColor;??
  90. ??
  91. ????protected?int?fontColor;??
  92. ??
  93. ????protected?Font?font?=?Font.getDefaultFont();??
  94. ??
  95. ????/**?用于执行消失窗口?*/??
  96. ????protected?TimerTask?task;??
  97. ??
  98. ????protected?Display?display;??
  99. ??
  100. ????protected?SoftButton?softButton;??
  101. ??????
  102. ???
  103. ???
  104. ??????
  105. ??????
  106. ????/**?
  107. ?????*?构???一个默认的标题,父类的窗???
  108. ?????*??
  109. ?????*?@param?title?
  110. ?????*?@param?parent?
  111. ?????*/??
  112. ????public?Dialog(String?title,?Panel?parent,?Display?display)?{??
  113. ????????this(title,?parent,?display,?3000);??
  114. ????}??
  115. ??
  116. ????/**?
  117. ?????*?构???一个指定时间的构???窗???
  118. ?????*??
  119. ?????*?@param?title?
  120. ?????*?@param?parent?
  121. ?????*?@param?timeOut?
  122. ?????*/??
  123. ????public?Dialog(String?title,?Panel?parent,?Display?display,?long?timeOut)?{??
  124. ????????this(title,?parent,?display,?Dialog.DIALOG_OK,?timeOut);??
  125. ????}??
  126. ??
  127. ????/**?
  128. ?????*?构???一个指定窗口类??,时间的窗???
  129. ?????*??
  130. ?????*?@param?title?
  131. ?????*?@param?parent?
  132. ?????*?@param?type?
  133. ?????*?@param?timeOut?
  134. ?????*/??
  135. ????public?Dialog(String?title,?Panel?parent,?Display?display,?int?type,??
  136. ????????????long?timeOut)?{??
  137. ????????setFullScreenMode(true);??
  138. ??????????
  139. ????????this.parent?=?parent;??
  140. ????????checkParent();??
  141. ??????????
  142. ????????this.timeOut?=?timeOut;??
  143. ????????this.type?=?type;??
  144. ????????this.title?=?title;??
  145. ????????this.display?=?display;??
  146. ??????????
  147. ????????softButton?=?new?SoftButton();??
  148. ??????????
  149. ???????
  150. ??????????
  151. ????????if?(timeOut?!=?0)??
  152. ????????????task?=?TimerTaskManager.getInstace().add(this,?timeOut);???
  153. ??????????
  154. ????????//设置默认的风????
  155. ????????setStyle(0x0033FF,?0xFFFFFF);??
  156. ??????????
  157. ????}??
  158. ??
  159. ????public?void?setStyle(int?bgColor,?int?fontColor)?{??
  160. ????????this.bgColor?=?bgColor;??
  161. ????????this.fontColor?=?fontColor;??
  162. ????}??
  163. ??
  164. ????public?void?cancel()?{??
  165. ????????//log.debug("Stop...");??
  166. ????????if?(parent?==?null)??
  167. ????????????throw?new?NullPointerException("Parent?is?not?Null.");??
  168. ??????????
  169. ????????task.cancel();??
  170. ????????if(parent?==?null)??
  171. ????????????return;??
  172. ??????????
  173. ????????display.setCurrent(parent);??
  174. ???????????
  175. ????}??
  176. ??
  177. ????public?void?addCommand(Command?cmd)?{??
  178. ????????this.softButton.addCommand(cmd);??
  179. ????}??
  180. ??
  181. ????public?void?setSoftButtonListener(CommandListener?cml)?{??
  182. ????????this.softButton.setCommandListener(cml);??
  183. ????}??
  184. ??????
  185. ????public?void?setSoftButtonStyle(int?bgColor,?int?fontColor){??
  186. ????????this.softButton.setStyle(bgColor,?fontColor);??
  187. ????}??
  188. ??
  189. ????public?void?run()?{??
  190. ????????cancel();??
  191. ??
  192. ????}??
  193. ??
  194. ????/**?绘制透明???*?*/??
  195. ???public???void?drawRGB(Graphics?g)?{??
  196. ????????int?ai[]?=?new?int[Platform.WIDTH];??
  197. ????????for?(int?j1?=?0;?j1?<?ai.length;?j1++)??
  198. ????????????ai[j1]?=?0x90000000;??
  199. ????????g.drawRGB(ai,?0,?0,?0,?0,?Platform.WIDTH,?Platform.HEIGHT,?true);?//?绘制透明景色??
  200. ????}??
  201. ??
  202. ???????
  203. ???????
  204. ??
  205. ??
  206. ????private?void?checkParent()?{??
  207. ????????if?(parent?==?null){??
  208. ?????????????throw?new?NullPointerException("Parent?is?not?null");??
  209. ????????}??
  210. ??????????????
  211. ????}??
  212. ??
  213. ????protected?void?keyPressed(int?keyCode)?{??
  214. ????????softButton.onClick(keyCode);??
  215. ??????????
  216. ????}??
  217. ??
  218. ????public?void?setPanel(Panel?panel)?{??
  219. ????????this.parent?=?panel;??
  220. ??????????
  221. ????}??
  222. ??
  223. ????public?void?setTimeOut(long?timeOut)?{??
  224. ????????this.timeOut?=?timeOut;??
  225. ????}??
  226. ??
  227. ????public?int?getType()?{??
  228. ????????return?type;??
  229. ????}??
  230. ??
  231. ????public?void?setType(int?type)?{??
  232. ????????this.type?=?type;??
  233. ????}???
  234. }?
下面这段是弹出一个对话框实现
java 代码
?
  1. /********************************************************************?
  2. ?*??
  3. ?*?版权说明，此程序仅供学习参考。不能用于商业?
  4. ?*??
  5. ?********************************************************************/??
  6. package?org.pook.ui.form;??
  7. ??
  8. import?java.util.Vector;??
  9. ??
  10. import?javax.microedition.lcdui.Font;??
  11. import?javax.microedition.lcdui.Graphics;??
  12. ??
  13. import?org.pook.Pook;??
  14. import?org.pook.log.Log;??
  15. import?org.pook.ui.Command;??
  16. import?org.pook.ui.SelectedPart;??
  17. import?org.pook.ui.core.Platform;??
  18. import?org.pook.ui.event.CommandListener;??
  19. import?org.pook.ui.util.FontUtil;??
  20. import?org.pook.ui.util.GraphicsUtil;??
  21. import?org.pook.util.StringUtil;??
  22. ???
  23. ???
  24. /**?
  25. ?*?类名：MessageDialog.java?
    ?    ?
  26. ?*?编写日期:?2006-9-26?
    ?
  27. ?*?程序功能描述：?
    ?
  28. ?*?Demo:?
    ?
  29. ?*?Bug:?
    ?
  30. ?*??
  31. ?*?程序变更日期?：
    ?    ?
  32. ?*?变更作者?：
    ?    ?
  33. ?*?变更说明?：
    ?
  34. ?*??
  35. ?*?@author?wuhua?
    ?    ?
  36. ?*/??
  37. public?class?MessageDialog?extends?TextDialog?implements?CommandListener{??
  38. ????private?static?Log?log?=?Log.getLog("MessageDialog");??
  39. ??????
  40. ??????
  41. ????private?Command?ok;???
  42. ??????
  43. ????private??SelectedPart?plan;??
  44. ????private?int??planHeight;??
  45. ???
  46. ????private?int?contentHeight;??
  47. ???
  48. ????private?int?viewSize;??
  49. ????private?int?space;??
  50. ??????
  51. ???
  52. ????private?Vector?content;??
  53. ????private?int?selectIndex;??
  54. ????private?int?contentY;??
  55. ??????
  56. ????public?MessageDialog(String?_title,String?_message,?long?_timeOut)?{??
  57. ????????super(_title,??Pook.MAINMENU,?Pook.getDisplay(),?_timeOut);??
  58. ????????ok?=?new?Command("确定",Command.LEFT,?Command.FIRST_PRIORITY);??
  59. ????????this.addCommand(ok);??
  60. ????????this.setSoftButtonListener(this);??
  61. ????????this.setMessage(_message);??
  62. ????????initView();??
  63. ????????this.setStyle(0x001D68,?0xFFFFFF);??
  64. ????????this.setSoftButtonStyle(0x0071BD,0xFFFFFF);??
  65. ????????this.setType(Dialog.DIALOG_OK);??
  66. ????}??
  67. ??????
  68. ????public?void?setMessage(String?message){??
  69. ???
  70. ????????skipMessage(message);??
  71. ????}??
  72. ??????
  73. ??
  74. ????private?void?skipMessage(String?message)?{??
  75. ??????????
  76. ????????if(message?==?null)??
  77. ????????????return?;??
  78. ??????????
  79. ????????content?=?new?Vector();??
  80. ????????String[]?text?=?StringUtil.split(message,?"\n");??
  81. ??????????
  82. ????????for(int?j?=0;?j?<?text.length;?j++){??
  83. ???????????
  84. ????????????String[]?t?=?FontUtil.splitOnlyStringToRowString(font,text[j],view[WIDTH]-6);??
  85. ????????????for(int?i=0;?i
  86. ????????????????content.addElement(t[i]);??????
  87. ????????????}??
  88. ????????????///content.addElement("");??
  89. ????????}??
  90. ??????????
  91. ????????//log.debug(content.size());??
  92. ??????????
  93. ????????//new?Plan??
  94. ???????
  95. ??????????
  96. ???????????
  97. ??????????
  98. ??????????
  99. ????}??
  100. ??
  101. ????protected?void?keyPressed(int?keyCode)?{??
  102. ????????super.keyPressed(keyCode);??
  103. ????????this.thisUpAndDown(keyCode);??
  104. ????????this.repaint();??
  105. ????}??
  106. ??????
  107. ????/**?
  108. ?????*?上下事件?
  109. ?????*??
  110. ?????*?@param?keyCode?
  111. ?????*/??
  112. ????private?void?thisUpAndDown(int?keyCode)?{??
  113. ??????????
  114. ????????if?(this.content?==?null)??
  115. ????????????return;??
  116. ??????????
  117. ????????if(this.content.size()?<?this.viewSize)??
  118. ????????????return;??
  119. ??????????
  120. ????????switch?(keyCode)?{??
  121. ??
  122. ????????case?Platform.KEY_UP:?{??
  123. ??
  124. ?????????????selectIndex?=??selectIndex?<=?0???content.size()?-?viewSize?-?1??
  125. ????????????????????:?--selectIndex;??
  126. ????????????//?log.debug("Key");??
  127. ????????????break;??
  128. ??
  129. ????????}??
  130. ????????case?Platform.KEY_DOWN:?{??
  131. ?????????????selectIndex?=??selectIndex?>=content.size()?-?viewSize?-?1???0??
  132. ????????????????????:?++selectIndex;??
  133. ?????????????//log.debug("Key1");??
  134. ??
  135. ????????????break;??
  136. ????????}??
  137. ????????}??
  138. ????}??
  139. ??
  140. ??
  141. ????public?void?commandAction(Command?cmd)?{??
  142. ????????if(cmd?==?ok)??
  143. ????????????this.cancel();??
  144. ??????????
  145. ????}??
  146. ????protected?void?paint(Graphics?g)?{??
  147. ????????parent.paint(g);??
  148. ????????drawRGB(g);??
  149. ????????this.softButton.paint(g);??
  150. ????????this.paintMessageDialog(g);??
  151. ??????????
  152. ????}??
  153. ??
  154. ??
  155. ??
  156. ????private?void?paintMessageDialog(Graphics?g)?{??
  157. ????????initView();??
  158. ????????g.setFont(font);??
  159. ????????GraphicsUtil.drawRectWithColor(g,0xFFD84F,?view[X]-1,view[Y]-1,view[WIDTH]+1,view[HEIGHT]+1);??
  160. ????????paintTitleImpl(g);??
  161. ????????paintContent(g);??
  162. ????????paintState(g);??
  163. ????}??
  164. ??????
  165. ????private?void?paintTitleImpl(Graphics?g)?{??
  166. ????????g.setColor(0x0071BC);??
  167. ????????g.fillRect(view[X],view[Y],view[WIDTH],font.getHeight()?+?2);??
  168. ????????g.setColor(0xFFFFFF);??
  169. ????????g.drawString(title,?view[X]?+?4,?view[Y]?+?1,Graphics.TOP|Graphics.LEFT);??
  170. ????}??
  171. ??????
  172. ????private?void?paintContent(Graphics?g)?{??
  173. ????????if(content.size()?>?viewSize?){??
  174. ????????????????this.plan?=?new?SelectedPart();??
  175. ????????????????plan.setStyle(0xFFFFFF,?0x000000);??
  176. ????????????????this.planHeight?=?contentHeight/(content.size()?-?viewSize);??
  177. ????????}??
  178. ????????contentY?=?view[Y]?+?font.getHeight()?+?4;??
  179. ???????????
  180. ????????g.setColor(0x001D68);??
  181. ????????g.fillRect(view[X],contentY,view[WIDTH],contentHeight);??
  182. ???
  183. ????????paintContentImpl(g);??
  184. ??????????
  185. ????}??
  186. ??????
  187. ????private?void?paintContentImpl(Graphics?g)?{??
  188. ????????if(content?==?null)??
  189. ????????????return?;??
  190. ??????
  191. ????????int?size?=?viewSize>content.size()?content.size():viewSize?+?selectIndex;??
  192. ??????????
  193. ????????g.setColor(0xFFFFFF);??
  194. ??????????
  195. ????????for(int?i?=?selectIndex;?i
  196. ????????????g.drawString((String)?content.elementAt(i),view[X]?+?2,?contentY?+?space?*?(i-selectIndex),?Graphics.TOP|Graphics.LEFT);??
  197. ????????}??
  198. ??????????
  199. ????????/**?
  200. ?????????*?绘制状态条?
  201. ?????????*/??
  202. ????????if(plan?!=?null){??
  203. ????????????//log.debug("SelectIndex?=?"?+?selectIndex);??
  204. ????????????plan.changePosition(view[WIDTH]?+?4?,?contentY?+?this.planHeight?*selectIndex,?4,this.planHeight);??
  205. ????????????plan.paint(g);??
  206. ????????}??
  207. ????}??
  208. ??
  209. ????private?void?paintState(Graphics?g)?{??
  210. ????????int?height?=?Platform.HEIGHT?-?30?-?font.getHeight()?-?2;??
  211. ????????g.setColor(0x0071BC);??
  212. ????????g.fillRect(view[X],?height??,view[WIDTH],font.getHeight()?+?2);??
  213. ????????g.setColor(0xFFFFFF);??
  214. ????????g.drawLine(view[X],height,view[WIDTH]?+?10,?height);??
  215. ????????g.setColor(0xFFFFFF)
1 楼 wuhua 2006-11-25  
Alert在不同的手机上可以有不同的效果。这是高级UI的特色
而自己实现的UI则可以在所有手机上有比较统一的效果。这也是我们自己的特色

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