如何在 RCP 应用程序中保存选中的复选框？

Question

我是 RCP 的初学者 framework.I 在 eclipse RCP3 应用程序名称中使用过一个编辑器 "Food editor"。在这个编辑器中，我制作了一个带有 SWT.Check Table 项的 SWT table。我在复选框 selection.

方面遇到问题

此编辑器的当前情况是，当食物编辑器打开时，我 select 选中复选框，然后我打开新的编辑器名称，如 Employee_Editor。 在 Employee_Editor 打开之前，我用 select 复选框关闭了食品编辑器。然后我再次打开 Food editor 然后上一个 "Selected" 复选框显示为 "Unselected" 为什么会这样？

我试图找到这个问题的解决方案我在互联网上搜索我找到了使用数据库 "selected check box" 保存为布尔数据类型的解决方案。但我不想这样做，因为当很多数据来临时 SQL 查询会触发。

因此，我尝试通过在 createPartControl 中定义一种方法 "saveSelectedCheckBox"，将 selected 复选框 table 项保存到 "selectedTableItemList" 中。但是当我关闭食物编辑器然后再次打开它时我也遇到了问题我遇到了空值 "selectedTableItemList" 的问题。我已经分享了下面给出的代码。

public class FoodDetailsEditor extends EditorPart {

public static final String ID = "rcp_demo.Editor.FoodDetailsEditor"; //$NON-NLS-1$Food_Details
public static final String BID = "Food_Details";
 private static final String STORE_SELECTION = "rcp_demo.Editor.FoodDetailsEditor";
private Table table;
 ArrayList<Integer>  selectedTableItemList= null;

@Override
public void createPartControl(Composite parent) {

    ScrolledComposite scrolledComposite_2 = new ScrolledComposite(parent, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    scrolledComposite_2.setExpandHorizontal(true);
    scrolledComposite_2.setExpandVertical(true);

    Composite composite = new Composite(scrolledComposite_2, SWT.NONE);
    composite.setLayout(new GridLayout(1, false));

    table = new Table(composite, SWT.BORDER | SWT.FULL_SELECTION|SWT.CHECK);
    GridData gd_table = new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1);
    gd_table.heightHint = 156;
    gd_table.widthHint = 565;
    table.setLayoutData(gd_table);
    table.setHeaderVisible(true);
    table.setLinesVisible(true);

    TableColumn tblclmnCheckbox = new TableColumn(table, SWT.NONE);
    tblclmnCheckbox.setWidth(100);
    tblclmnCheckbox.setText("Checkbox");

    TableColumn tblclmnTiming = new TableColumn(table, SWT.NONE);
    tblclmnTiming.setWidth(100);
    tblclmnTiming.setText("Timing");

    TableColumn tblclmnMonday = new TableColumn(table, SWT.NONE);
    tblclmnMonday.setWidth(100);
    tblclmnMonday.setText("Monday");

    TableColumn tblclmnTuesday = new TableColumn(table, SWT.NONE);
    tblclmnTuesday.setWidth(100);
    tblclmnTuesday.setText("Tuesday");

    TableColumn tblclmnWednesday = new TableColumn(table, SWT.NONE);
    tblclmnWednesday.setWidth(100);
    tblclmnWednesday.setText("Wednesday");

    TableColumn tblclmnThursday = new TableColumn(table, SWT.NONE);
    tblclmnThursday.setWidth(100);
    tblclmnThursday.setText("Thursday");

    TableColumn tblclmnFriday = new TableColumn(table, SWT.NONE);
    tblclmnFriday.setWidth(100);
    tblclmnFriday.setText("Friday");

    TableColumn tblclmnSaturday = new TableColumn(table, SWT.NONE);
    tblclmnSaturday.setWidth(100);
    tblclmnSaturday.setText("Saturday");
    scrolledComposite_2.setContent(composite);
    scrolledComposite_2.setMinSize(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT));

    TableItem item1 = new TableItem(table, SWT.NONE);
    item1.setText(new String[]{"","10:00 to 10:30","Food1","Food2","Food3","Food4","Food5"});
    TableItem item2 = new TableItem(table, SWT.NONE);
    item2.setText(new String[]{"","11:00 to 11:30","Food1","Food2","Food3","Food4","Food5"});
    TableItem item3 = new TableItem(table, SWT.NONE);
    item3.setText(new String[]{"","12:00 to 12:30","Food1","Food2","Food3","Food4","Food5"});
    TableItem item4 = new TableItem(table, SWT.NONE);
    item4.setText(new String[]{"","13:00 to 13:30","Food1","Food2","Food3","Food4","Food5"});


    table.addSelectionListener(new SelectionAdapter()
    {               
        @Override
        public void widgetSelected(SelectionEvent event)
        {
            if( event.detail == SWT.CHECK ) 
                {
                  if( table.indexOf( ( TableItem )event.item ) == table.getSelectionIndex() ) 
                   {

                    TableItem ti = ( TableItem )event.item;
                    ti.setChecked( !ti.getChecked() );                      
                    System.out.println("event.index:-"+event.item);                     

                    }
                } 
              saveSelectedCheckBox(table);
        }

        private void saveSelectedCheckBox(Table table) {
            // TODO Auto-generated method stub
             TableItem[] items =  table.getItems();
          selectedTableItemList=new ArrayList<Integer>();//Creating arraylist 

                for (int ro = 0; ro < table.getItemCount();ro++)
                {      if(items[ro].getChecked()== true)
                        {
                        System.out.println("items[ro]:=="+items[ro]);
                        selectedTableItemList.add(ro);
                        }

                    } 
                for(int row = 0; row < selectedTableItemList.size();row++)
                {
                     System.out.println("selectedTableItemList:--"+selectedTableItemList);
                }
        }
    });
}

@Override
public void setFocus() {
    // Set the focus
}

@Override
public void doSave(IProgressMonitor monitor) {
    // Do the Save operation    
}

@Override
public void doSaveAs() {
    // Do the Save As operation     
}

@Override
public void init(IEditorSite site, IEditorInput input)
        throws PartInitException {
    System.out.println("init called");
     System.out.println("selectedTableItemList:--"+selectedTableItemList);
    // Initialize the editor part
     if (!(input instanceof FoodDetailsEditorInput)) {
          throw new PartInitException("Invalid Input: Must be " + FoodDetailsEditorInput.class.getName());
      }
      setSite(site);
      setInput(input);
}

@Override
public boolean isDirty() 
{   
    return false;
}

@Override
public boolean isSaveAsAllowed() {
    System.out.println("isSaveAsAllowed called");
    return true;
}
}

我想当食物编辑器打开时，我 select 选中复选框，然后我打开新的编辑器名称，如 Employee_Editor。 然后我再次打开食物编辑器 "Selected" 复选框显示为 "Selected"。如何做到这一点？请帮助我。

我的系统配置：

Windows 64Bit OS.
Eclipse Kepler 32 bit.
jdk 1.8

Answer 1

    table.addSelectionListener(new SelectionAdapter()
    {  
        @Override
        public void widgetSelected(SelectionEvent event)
        {
            if( event.detail == SWT.CHECK ) 
                {
                   if( table.indexOf( ( TableItem )event.item ) == table.getSelectionIndex() ) 
                   {
                    TableItem ti = ( TableItem )event.item;
                    ti.setChecked( !ti.getChecked() );                      
                    }
                   saveSelectedCheckBox(table);
                }                
        }
        private void saveSelectedCheckBox(Table table)
        {
              for (int ro = 0; ro < table.getItemCount();ro++)//#32
                {      if(items[ro].getChecked()== true)//#32
                        {//#32
                        System.out.println("items[ro]:=="+items[ro]);//#32
                        selectedTableItemList.add(ro);//#32
                        }//#32

                    } //#32
                for(int row = 0; row < selectedTableItemList.size();row++)//#32
                {//#32


            //*For FileSaving try
            FileDialog dialog = new FileDialog(table.getShell(), SWT.SAVE);
             TableItem[] items =table.getItems();
             dialog.setText("Save");
                String absolutePath = dialog.open();
                if (absolutePath == null)
                    return;


                File fl = new File(dialog.getFilterPath() + File.separator + dialog.getFileName());
                FileWriter flwr;
                int cls = table.getColumnCount();
                        try {
                            flwr = new FileWriter(fl);
                            for (int i = 0; i < items.length; i++) {
                                for (int j = 0; j <= cls; j++) {
                                    flwr.write(items[i].getText(j) + "\t");
                                }
                                flwr.write("\n");
                            }
                            flwr.flush();
                            flwr.close();
                        } catch (IOException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }
        }
    });

Answer 2

当您关闭编辑器时，您会失去它的状态，并且 createPartControl() 在打开编辑器时会再次执行。因此，您的 table 处于初始状态。您应该在创建 table 之后执行 TableItem.setChecked() 并将值设置为先前用户选择的值。最好的方法是将 table 行中的数据转换为对象并使用 TableViewer 创建 table.

private TableViewer viewer;
private List<WeeklyMenu> menu = Menu.MENU.getWeeklyMenu(); 

public void createPartControl(Composite parent) {
    Table table = createTable(parent);

    viewer.setInput(menu);

    for (TableItem item : table.getItems()) {
        WeeklyMenu weeklyMenu = (WeeklyMenu)item.getData();
        item.setChecked(weeklyMenu.isChecked());
    }

    viewer.refresh();

    table.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            if( e.detail == SWT.CHECK ) 
            {
                TableItem item = (TableItem)e.item;
                WeeklyMenu weeklyMenu = (WeeklyMenu)item.getData();
                weeklyMenu.setChecked(item.getChecked());
            } 
        }
    });

}

private Table createTable(Composite parent) {
    viewer = new TableViewer(parent, SWT.BORDER | SWT.FULL_SELECTION | SWT.CHECK);
    Table table = viewer.getTable();
    table.setHeaderVisible(true);
    table.setLinesVisible(true);
    viewer.setContentProvider(new IStructuredContentProvider() {

        @Override
        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
            // TODO Auto-generated method stub

        }

        @Override
        public void dispose() {
            // TODO Auto-generated method stub

        }

        @Override
        public Object[] getElements(Object inputElement) {
            return menu.toArray();
        }
    });

    createColumns(table);
    return table;
}

private void createColumns(Table table) {
    TableLayout layout = new TableLayout();
    layout.addColumnData(new ColumnWeightData(10, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    layout.addColumnData(new ColumnWeightData(20, true));
    table.setLayout(layout);

    TableViewerColumn column = createTableViewerColumn("Checkbox");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return "";
        }
    });

    column = createTableViewerColumn("Timing");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getTiming();
        }
    });

    column = createTableViewerColumn("Monday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getMonFood();
        }
    });

    column = createTableViewerColumn("Tuesday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getTueFood();
        }
    });

    column = createTableViewerColumn("Wednesday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getWedFood();
        }
    });

    column = createTableViewerColumn("Thursday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getThuFood();
        }
    });

    column = createTableViewerColumn("Friday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getFriFood();
        }
    });

    column = createTableViewerColumn("Saturday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getSatFood();
        }
    });

    column = createTableViewerColumn("Sunday");
    column.setLabelProvider(new ColumnLabelProvider(){
        @Override
        public String getText(Object element) {
            return ((WeeklyMenu)element).getSunFood();
        }
    });
}

private TableViewerColumn createTableViewerColumn(String name) {
    TableViewerColumn viewerColumn = new TableViewerColumn(viewer, SWT.CENTER);
    TableColumn column = viewerColumn.getColumn();
    column.setText(name);
    column.setMoveable(true);
    return viewerColumn;
}

Class WeeklyMenu:

public class WeeklyMenu {
private boolean isChecked;
private String timing;
private String monFood;
private String tueFood;
private String wedFood;
private String thuFood;
private String friFood;
private String satFood;
private String sunFood;

public WeeklyMenu(boolean isChecked, String timing, String monFood, String tueFood, String wedFood, String thuFood, String friFood,
        String sutFood, String sunFood) {
    super();
    this.isChecked = isChecked;
    this.timing = timing;
    this.monFood = monFood;
    this.tueFood = tueFood;
    this.wedFood = wedFood;
    this.thuFood = thuFood;
    this.friFood = friFood;
    this.satFood = sutFood;
    this.sunFood = sunFood;
}

public String getTiming() {
    return timing;
}

public void setTiming(String timing) {
    this.timing = timing;
}

public boolean isChecked() {
    return isChecked;
}
public void setChecked(boolean isChecked) {
    this.isChecked = isChecked;
}
public String getMonFood() {
    return monFood;
}
public void setMonFood(String monFood) {
    this.monFood = monFood;
}
public String getTueFood() {
    return tueFood;
}
public void setTueFood(String tueFood) {
    this.tueFood = tueFood;
}
public String getWedFood() {
    return wedFood;
}
public void setWedFood(String wedFood) {
    this.wedFood = wedFood;
}
public String getThuFood() {
    return thuFood;
}
public void setThuFood(String thuFood) {
    this.thuFood = thuFood;
}
public String getFriFood() {
    return friFood;
}
public void setFriFood(String friFood) {
    this.friFood = friFood;
}
public String getSatFood() {
    return satFood;
}
public void setSatFood(String sutFood) {
    this.satFood = sutFood;
}
public String getSunFood() {
    return sunFood;
}
public void setSunFood(String sunFood) {
    this.sunFood = sunFood;
}

}

和class Menu:

public class Menu {
public final static Menu MENU = new Menu();
private List<WeeklyMenu> weeklyMenu = new ArrayList<WeeklyMenu>();

private Menu(){
    weeklyMenu.add(new WeeklyMenu(false, "10:00 to 10:30", "Food1", "Food2", "Food3", "Food4", "Food5", "Food6", "Food7"));
    weeklyMenu.add(new WeeklyMenu(false, "10:30 to 11:00", "Food1", "Food2", "Food3", "Food4", "Food5", "Food6", "Food7"));
    weeklyMenu.add(new WeeklyMenu(false, "11:00 to 11:30", "Food1", "Food2", "Food3", "Food4", "Food5", "Food6", "Food7"));
    weeklyMenu.add(new WeeklyMenu(false, "11:30 to 12:00", "Food1", "Food2", "Food3", "Food4", "Food5", "Food6", "Food7"));
}

public List<WeeklyMenu> getWeeklyMenu() {
    return weeklyMenu;
}

}

将此 class 添加到您的项目中，并将您的 createPartControl() 替换为引用的代码片段。

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