设计可组建的j2me UI（六） Dialog(对话框）

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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