nuoda

控制器设计

通用模型

我们可以简单抽取一个控制器通用模型，实现监听器的注册和注销，其它控制器继承该控制器。

public class AbstractEditPart extends AbstractGraphicalEditPart

      implements PropertyChangeListener{

      //@Override

      public void activate(){

             super.activate();

             ((AbstractNode)getModel()).addPropertyChangeListener(this);

             //System.out.println("activate");

      }

      //@Override

      public void deactivate(){

             super.deactivate();

             ((AbstractNode)getModel()).removePropertyChange(this);

             //System.out.println("deactivate");

      }

      //@Override

      protected IFigure createFigure() {

             // TODO Auto-generated method stub

             return null;

      }

      //@Override

      protected void createEditPolicies() {

             // TODO Auto-generated method stub

      }

      public void propertyChange(PropertyChangeEvent evt) {

             // TODO Auto-generated method stub

      }

}

表格控制器设计

表格的控制器虽然比较复杂，但是也理解其机制，也不是特别复杂。重要的是要考虑表格中含有子元素，所以要注意：供子元素列表获取；子元素画板获取；素发生变化时，在刷新视图的显示、刷新子元素列表；安装相应的策略等。

public class FormTableEditPart extends AbstractEditPart{

      protected IFigure createFigure() {

             return new TableFigure((TableNode)getModel());

      }

      public void refreshVisuals(){

             Rectangle constraint = ((TableNode)getModel()).getConstraint();

             if(constraint.width==-1 || constraint.height == -1){

                    constraint.width= ((TableNode)getModel()).getGrid().numColumns * 20+2;//((TableNode)getModel()).getWidthHint()

                    constraint.height=((TableNode)getModel()).getHeightHint()*2+2;

                    ((TableNode)getModel()).setConstraint(constraint);

             }

             ((GraphicalEditPart)getParent()).setLayoutConstraint(this, getFigure(), constraint);

      }

      public List getModelChildren(){

             return ((TableNode)getModel()).getChildren();

      }

      public void createEditPolicies(){

             installEditPolicy(EditPolicy.CONTAINER_ROLE,new ContainerLayoutEditPolicy());

             installEditPolicy(EditPolicy.COMPONENT_ROLE,new FormDeleteEditPolicy());

      }

      public IFigure getContentPane(){

             return ((TableFigure)getFigure()).getContainerFigure();

      }

      public void propertyChange(PropertyChangeEvent event){

             String prop=event.getPropertyName();

             if(TableNode.P_CHILDREN.equals(prop)){

                    this.refreshChildren();

                    this.refreshVisuals();

             }else if(prop.equals(TableNode.P_CONSTRAINT)){

                    refreshVisuals();

             }else if(prop.equals(TableNode.P_CHILDCHANGE)){

                    refreshVisuals();

             }else if(prop.equals(TableNode.P_GRIDMANAGER)){

                    String delta=(String)event.getNewValue();

                    test(delta);

                    TableNode table=(TableNode)getModel();

                    Rectangle cons=TableTool.getTableConstraint(table);

                    table.setConstraint(cons);

             }else if(prop.equals(TableNode.P_TABLEBGCOLOR)){

                    getFigure().setBackgroundColor(((TableNode)getModel()).getBgColor());

             }

             super.propertyChange(event);

      }

      public void test(String delta){

             List list=this.getChildren();

             IFigure parent=getContentPane();

             String type=delta.split(":")[0];

             int chgValue=Integer.parseInt(delta.split(":")[1]);

             GridLayout layout=((TableNode)getModel()).getGrid();

             for(int i=0;i<list.size();i++){

                    CellEditPart part=(CellEditPart)list.get(i);

                    GridData gridData=((CellNode)part.getModel()).getGridData();

                    if("vspace".equalsIgnoreCase(type)){

                           if(gridData.verticalSpan >1){

                                  gridData.heightHint+=(gridData.verticalSpan-1)*chgValue;

                           }

                    }else if("hspace".equalsIgnoreCase(type)){

                           if(gridData.horizontalSpan >1){

                                  gridData.widthHint+=(gridData.horizontalSpan-1)*chgValue;

                           }

                    }else{

                    }

                    layout.setConstraint(part.getFigure(), gridData);

             }

      }

}

其它控制器

其它控制器类似。

至此，控制器业基本完成。