如何在JFace的TableViewer中创建一个复选框？
我创建了一个包含两列的tableViewer，我想让其中一个成为复选框。 为此，我创建了一个CheckBoxCellEditor，但我不知道为什么它不起作用。
名为tableName的列显示其值为OK。
列规范如下。
String[] COLUMN_HEADINGS = {"Select", "Table name"}; TableColumnLayout tableLayout = new TableColumnLayout(); parent.setLayout(tableLayout); //Set what would display each column TableViewerColumn selectCheckBox = createTableViewerColumn(COLUMN_HEADINGS[0], 0); selectCheckBox.getColumn().setResizable(false); selectCheckBox.setLabelProvider(new ColumnLabelProvider(){ @Override public String getText(Object element) { return null; } }); //Set what would display each column TableViewerColumn tableName = createTableViewerColumn(COLUMN_HEADINGS[1], 1); tableName.getColumn().setResizable(false); tableName.setLabelProvider(new ColumnLabelProvider(){ public String getText(Object element) { if(element instanceof TableMetaData && element != null) return ((TableMetaData)element).getName(); return super.getText(element); } }); //Set the dimensions of each column tableLayout.setColumnData(selectCheckBox.getColumn(), new ColumnWeightData(10)); tableLayout.setColumnData(tableName.getColumn(), new ColumnWeightData(90)); //Set column type (checkbox) selectCheckBox.setEditingSupport(new ResourcesConfigCheckEditingSupport(this)); 而EditingSupport则如下：
public class ResourcesConfigCheckEditingSupport extends EditingSupport{ private CheckboxCellEditor cellEditor; public ResourcesConfigCheckEditingSupport(ColumnViewer viewer) { super(viewer); // TODO Auto-generated constructor stub cellEditor = new CheckboxCellEditor(null, SWT.CHECK | SWT.READ_ONLY); } @Override protected CellEditor getCellEditor(Object element) { // TODO Auto-generated method stub return cellEditor; } @Override protected boolean canEdit(Object element) { // TODO Auto-generated method stub return false; } @Override protected Object getValue(Object element) { // TODO Auto-generated method stub return ((TableMetaData) element).getIsSelected(); } @Override protected void setValue(Object element, Object value) { // TODO Auto-generated method stub ((TableMetaData) element).setIsSelected(Boolean.valueOf((boolean) value)); getViewer().update(element, null); } }
TableMetaData对象决定是否要选中复选框。 如何修复我的代码才能使其正常工作？
谢谢。
Vogella有一个完整的例子，你可以在这里找到： http ：//www.vogella.com/tutorials/EclipseJFaceTableAdvanced/article.html
在第4节中，使用了CheckboxCellEditor 。 它可能对你有所帮助。
为了使它工作，我使用Vogella的解决方案使用图像。 问题是图像不能在表格的单元格中居中，它们出现在它们的左侧。 我曾尝试使用“X”和“ – ”，但我不知道第一列会发生什么，它既不会使文本居中。 所以为了解决这个问题，我改变了列的顺序，并且我使用了unicode字符。
解决方案代码如下编辑支持：
public class ResourcesConfigCheckEditingSupport extends EditingSupport{ private CheckboxCellEditor cellEditor; public ResourcesConfigCheckEditingSupport(ColumnViewer viewer) { super(viewer); // TODO Auto-generated constructor stub //cellEditor = new CheckboxCellEditor(null, SWT.CHECK | SWT.READ_ONLY); cellEditor = new CheckboxCellEditor(((TableViewer)viewer).getTable()); } @Override protected CellEditor getCellEditor(Object element) { // TODO Auto-generated method stub return cellEditor; } @Override protected boolean canEdit(Object element) { // TODO Auto-generated method stub return true; } @Override protected Object getValue(Object element) { // TODO Auto-generated method stub return ((TableMetaData) element).getIsSelected(); } @Override protected void setValue(Object element, Object value) { // TODO Auto-generated method stub ((TableMetaData) element).setIsSelected(Boolean.valueOf((boolean) value)); getViewer().update(element, null); } }
以下是创建列：
public class ResourcesConfigViewer extends TableViewer{ public ResourcesConfigViewer(Composite parent,int style) { super(parent, style); //Get the table and set the headers visible and the lines Table table = getTable(); table.setHeaderVisible(true); table.setLinesVisible(true); //Create the columns of the tableviewer createColumns(parent); //Set the tableviewer contentProvider setContentProvider(new ResourcesConfigTableContentProvider()); } /*With this function we create the tableviewer columns and how they will (TextCell) and what they would display*/ private void createColumns(Composite parent) { //Headers of the table String[] COLUMN_HEADINGS = {"Table name", "Select"}; TableColumnLayout tableLayout = new TableColumnLayout(); parent.setLayout(tableLayout); //Set what would display each column TableViewerColumn tableName = createTableViewerColumn(COLUMN_HEADINGS[0], 0); tableName.getColumn().setResizable(false); tableName.setLabelProvider(new ColumnLabelProvider(){ public String getText(Object element) { if(element instanceof TableMetaData && element != null) return ((TableMetaData)element).getName(); return super.getText(element); } }); //Set what would display each column TableViewerColumn selectCheckBox = createTableViewerColumn(COLUMN_HEADINGS[1], 1); selectCheckBox.getColumn().setResizable(false); selectCheckBox.setLabelProvider(new ColumnLabelProvider(){ public String getText(Object element) { if(element instanceof TableMetaData && element != null){ if(((TableMetaData)element).getIsSelected()){ return Character.toString((char)0x2611); }else{ return Character.toString((char)0x2610); } } return super.getText(element); //return null; } @Override public Image getImage(Object element) { /*if(element instanceof TableMetaData && element != null){ if(((TableMetaData)element).getIsSelected()){ return checked; }else{ return unChecked; } } return super.getImage(element);*/ return null; } }); //Set the dimensions of each column tableLayout.setColumnData(selectCheckBox.getColumn(), new ColumnWeightData(10)); tableLayout.setColumnData(tableName.getColumn(), new ColumnWeightData(90)); //Set column type (checkbox) selectCheckBox.setEditingSupport(new ResourcesConfigCheckEditingSupport(this)); } //Creates the column private TableViewerColumn createTableViewerColumn(String header, int idx) { //To put checkbox centered in cell. int infoLocation = SWT.LEFT; if(idx == 1){ infoLocation = SWT.CENTER; } TableViewerColumn column = new TableViewerColumn(this, infoLocation, idx); column.getColumn().setText(header); column.getColumn().setResizable(true); column.getColumn().setMoveable(true); return column; } }
解决方案图片