在定制Eclipse SWT组件中实现MVC

  public class exampleview extends viewpart   { ... public void createpartcontrol(composite parent)   { // define a grid layout   gridlayout layout = new gridlayout();   layout.numcolumns = 1;   layout.marginheight = 0;   layout.marginwidth = 0; l  ayout.horizontalspacing = 0;   layout.verticalspacing = 1;   parent.setlayout(layout);   // create widgets createactionbar(parent);   createtree(parent);   // add context menu and listeners  viewer.adddoubleclicklistener(this); viewer.addselectionchangedlistener(openaction);   // register viewer so actions respond to selection getsite().setselectionprovider(viewer);   hookcontextmenu();   }  private void createtree(composite parent)   {   viewer = new treeviewer(parent, swt.single | swt.h_scroll | swt.v_scroll | swt.border);  viewer.setcontentprovider(new exampleviewcontentprovider()); viewer.setlabelprovider  (new exampleviewlabelprovider());   viewer.setsorter(new viewersorter());   viewer.setinput(modelmanager.getexamplemodel());   viewer.getcontrol().setlayoutdata(new griddata(griddata.fill_both));   } ... }   

    public class exampleviewcontentprovide implements itreecontentprovide {  

  /** * register content provider with model. */   public void inputchanged(viewer viewer, object oldinput, object newinput)   {   if (newinput != null)      {   this.viewer = viewer;  this.model = (exampledelegate)newinput; this.model.addmodellistener(this);   }   }  

  public void createpartcontrol(composite parent) {  exampleeditlayout _layout = new       exampleeditlayout(parent,swt.none,fieldmode.read,new exampleviewcontentprovider());  }

  public void createcontrols(int style) {  griddata    griddata;  text                textfld, subjectfld;  control            tolabel, cclabel, bcclabel;  control            fromdatetime;  control            control;  button durationtext;  button submit;  gridlayout layout = new gridlayout(2, false);  layout.marginwidth = 0;  layout.marginheight = 4;  setlayout(layout);  //label  griddata = new griddata(griddata.horizontal_align_fill  | griddata.vertical_align_center);  griddata.horizontalindent = 10;  labelfactory.create(this,     messages.getstring("exampleeditlayout.title"), griddata); //$non-nls-1$  griddata = new griddata(griddata.horizontal_align_fill  | griddata.vertical_align_center);  griddata.horizontalindent = 40;  labelfactory.create(this, "", griddata);  //text  griddata = new griddata(griddata.horizontal_align_fill  | griddata.vertical_align_center);  griddata.horizontalindent = 10;  control = labelfactory.create(this,     messages.getstring("exampleeditlayout.email"), griddata); //$non-nls-1$  griddata = new griddata(griddata.horizontal_align_beginning  | griddata.vertical_align_center);  griddata.horizontalindent = 10;  control = textfactory.create(this,    swt.border | swt.v_scroll | swt.wrap, griddata, fieldmode.edit); //$non-nls-1$  addfield(new textfield(control, exampleviewcontentprovider.first_index));  //combo  griddata = new griddata(griddata.horizontal_align_fill  | griddata.vertical_align_center);  griddata.horizontalindent = 10;  labelfactory.create(this,     messages.getstring("exampleeditlayout.group"), griddata); //$non-nls-1$  griddata = new griddata(griddata.horizontal_align_beginning  | griddata.vertical_align_center);  griddata.horizontalindent = 40;  control = combofactory.create(this,     fieldmode.edit, false, griddata); //$non-nls-1$  addfield(new combofield(control,  exampleviewcontentprovider.second_index));  ...}  

  public class textfield extends field {      /**      * @param control      * @param id      */      public textfield(control control, int id) {          super(control, id);      }      /* based on the id of the widget, values retrieved from        * the content provider are set.       */      public  void readfromcontent(iexamplecontentprovider content) {          string newtext = (string )content.getelement(getid());          if (newtext != null)              ((text )_control).settext(newtext);      }      /* based on the id of the widget, values retrieved from widget are        * sent back to the content provider.       */      public void writetocontent(iexamplecontentprovider content) {          string newtext = ((text )_control).gettext();          content.setelement(getid(), newtext);      }  }

  public object getelement(int iindex) {          switch (iindex) {          case first_index: return "[email protected]";          case second_index : return new integer(1);          case fourth_index : return new boolean(true);          case third_index: return new boolean(false);          case fifth_index: return new boolean(false);          }          return null;      }  

  public form (composite parent, int style, fieldmode mode, exampleviewcontentprovider content) {              super(parent, style);              _content = content;              _style = style;              setmode(mode);              init(style);      }         private void init(int style) {              createcontrols(style);          controlscreated();      }  protected void controlscreated() {              readfromcontent();      }