我创建了一个包含两列的TableViewer，我想在按下一个名为“add”的按钮后向其中添加行。按下按钮后，我想创建一个空行，第一列单元格将提供键入文本的选项，第二列单元格将提供浏览系统目录以选择文件夹的选项。
我已经设法在单击“添加”按钮后添加一个空行，但它返回以下错误：发生了错误。有关详细信息，请参阅错误日志断言失败：第0列没有标签提供者。 tableviewer的目的是在第一个列单元格中插入一个String变量，在第二个列单元格中插入一个路径。使用用户插入的数据，我想创建一个名为ProjectDirectory的类的List（此类有两个String属性）。
我还设法删除了我用鼠标选择的行，这样可以正常工作。
我是使用Jface和SWT的新手，我无法做到这一点。有人可以帮帮我吗？
代码：
Composite tableComposite = new Composite(pluginPathCreatedComposite, SWT.NONE);
FormData tableCompositeData = new FormData();
tableCompositeData.left = new FormAttachment(selectProjectPathLabel, 0, SWT.LEFT);
tableCompositeData.top = new FormAttachment(selectProjectPathLabel, 40, SWT.TOP);
tableCompositeData.right = new FormAttachment(selectProjectPathButton,-10,SWT.LEFT);
tableCompositeData.bottom = new FormAttachment(createProjectConfigButton,-10,SWT.TOP);
tableComposite.setLayoutData(tableCompositeData);
//Create the tableviewer
tableViewer = new TableViewer(tableComposite, SWT.SINGLE | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
Table table = tableViewer.getTable();
tableViewer.getTable().setLinesVisible(true);
tableViewer.getTable().setHeaderVisible(true);
tableViewer.setColumnProperties(COLUMN_HEADINGS);
//Create the tableViewer columns
TableViewerColumn variable = new TableViewerColumn(tableViewer, SWT.NONE);
variable.getColumn().setText(COLUMN_HEADINGS[0]);
variable.getColumn().setResizable(false);
TableViewerColumn path = new TableViewerColumn(tableViewer, SWT.NONE);
path.getColumn().setText(COLUMN_HEADINGS[1]);
path.getColumn().setResizable(false);
TableColumnLayout tableLayout = new TableColumnLayout();
tableComposite.setLayout(tableLayout);
//Set the columns proportions
tableLayout.setColumnData(path.getColumn(), new ColumnWeightData(50));
tableLayout.setColumnData(variable.getColumn(), new ColumnWeightData(50));
//Set the first row as TextCell (this doesn´t work)
CellEditor[] editors = new CellEditor[2];
editors[0] = new TextCellEditor(tableViewer.getTable());
editors[1] = new TextCellEditor(tableViewer.getTable());
tableViewer.setCellEditors(editors);
//Add button
Button addRow = new Button(pluginPathCreatedComposite, SWT.NONE);
FormData addRowData = new FormData();
addRowData.top = new FormAttachment(tableComposite,0,SWT.TOP);
addRowData.left = new FormAttachment(selectProjectPathButton,0,SWT.LEFT);
addRowData.right = new FormAttachment(selectProjectPathButton,0,SWT.RIGHT);
addRow.setLayoutData(addRowData);
addRow.setText("Add");
addRow.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
ProjectDirectory directory = new ProjectDirectory("A", "A");
Table table = tableViewer.getTable();
tableViewer.add(directory);
table.setTopIndex(table.getItemCount());
table.select(table.getItemCount() - 1);
}
});
//Delete row
Button deleteRow = new Button(pluginPathCreatedComposite, SWT.NONE);
FormData deleteRowData = new FormData();
deleteRowData.top = new FormAttachment(addRow,5,SWT.BOTTOM);
deleteRowData.left = new FormAttachment(selectProjectPathButton,0,SWT.LEFT);
deleteRowData.right = new FormAttachment(selectProjectPathButton,0,SWT.RIGHT);
deleteRow.setLayoutData(deleteRowData);
deleteRow.setText("Delete");
deleteRow.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
ISelection selection = tableViewer.getSelection();
if (selection instanceof IStructuredSelection) {
Iterator iterator = ((IStructuredSelection) selection).iterator();
while (iterator.hasNext()) {
Object obj = iterator.next();
tableViewer.remove(obj);
}
}
}
});
图片：
修改
我创建了一个内容提供程序来获取在代码中创建的List的ProjectDirectories（我将来会更改它）。之后，我为每列创建了一个标签提供程序，它显示了我想要的数据。
事实是我想在按下添加按钮后在表中添加一个新行，我想让第一个单元格成为TextCellEditor（第二个单元格将有一个事件来打开系统的目录路径图像之一，但在此之前我还想让它成为TextCellEditor）。我已经定义了两列将像TextCell编辑器一样，在按下添加按钮后我设法添加一个空行，但是我无法在其中键入文本。我还创建了一个setCellModifier来更新tableviewer。我做错了什么？
代码
Composite tableComposite = new Composite(pluginPathCreatedComposite, SWT.NONE);
FormData tableCompositeData = new FormData();
tableCompositeData.left = new FormAttachment(selectProjectPathLabel, 0, SWT.LEFT);
tableCompositeData.top = new FormAttachment(selectProjectPathLabel, 40, SWT.TOP);
tableCompositeData.right = new FormAttachment(selectProjectPathButton,-10,SWT.LEFT);
tableCompositeData.bottom = new FormAttachment(createProjectConfigButton,-10,SWT.TOP);
tableComposite.setLayoutData(tableCompositeData);
tableViewer = new TableViewer(tableComposite, SWT.SINGLE | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
table = tableViewer.getTable();
table.setLinesVisible(true);
table.setHeaderVisible(true);
tableViewer.setColumnProperties(COLUMN_HEADINGS);
//Content provider
tableViewer.setContentProvider(new ProjectConfigTableContentProvider());
/*I have tried to use this instead of setting the label providers in the column definitions*/
//tableViewer.setLabelProvider(new ProjectConfigTableLabelProvider());
//Label provider setted in each column
TableViewerColumn variable = new TableViewerColumn(tableViewer, SWT.NONE);
variable.getColumn().setText(COLUMN_HEADINGS[0]);
variable.getColumn().setResizable(false);
variable.setLabelProvider(new ColumnLabelProvider(){
public String getText(Object element) {
if(element instanceof ProjectDirectory && element != null)
return ((ProjectDirectory)element).getName();
return super.getText(element);
}
});
TableViewerColumn path = new TableViewerColumn(tableViewer, SWT.NONE);
path.getColumn().setText(COLUMN_HEADINGS[1]);
path.getColumn().setResizable(false);
path.setLabelProvider(new ColumnLabelProvider(){
public String getText(Object element) {
if(element instanceof ProjectDirectory && element != null)
return ((ProjectDirectory)element).getPath();
return super.getText(element);
}
});
//List created in code (will change this in the future)
List<ProjectDirectory> b = new ArrayList<ProjectDirectory>();
b.add(new ProjectDirectory("AA", "FF"));
b.add(new ProjectDirectory("BB", "CC"));
Project pro = new Project("A", "B", 2, b);
//Input setted
tableViewer.setInput(pro);
TableColumnLayout tableLayout = new TableColumnLayout();
tableComposite.setLayout(tableLayout);
tableLayout.setColumnData(path.getColumn(), new ColumnWeightData(50));
tableLayout.setColumnData(variable.getColumn(), new ColumnWeightData(50));
CellEditor[] editors = new CellEditor[2];
editors[0] = new TextCellEditor(table);
editors[1] = new TextCellEditor(table);
tableViewer.setCellEditors(editors);
tableViewer.setCellModifier(new ProjectConfigTableCellModifier(COLUMN_HEADINGS,tableViewer));
//addrow button
Button addRow = new Button(pluginPathCreatedComposite, SWT.NONE);
FormData addRowData = new FormData();
addRowData.top = new FormAttachment(tableComposite,0,SWT.TOP);
addRowData.left = new FormAttachment(selectProjectPathButton,0,SWT.LEFT);
addRowData.right = new FormAttachment(selectProjectPathButton,0,SWT.RIGHT);
addRow.setLayoutData(addRowData);
addRow.setText("Add");
addRow.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
ProjectDirectory directory = new ProjectDirectory("", "");
tableViewer.add(directory);
table.setTopIndex(table.getItemCount());
table.select(table.getItemCount() - 1);
tableViewer.editElement(directory, 0);
}
});
我还创建了一个labelProvider类，以避免像我一样在每一列中设置标签提供程序，但它不起作用。代码是这样的：
@Override
public String getColumnText(Object element, int columnIndex) {
// TODO Auto-generated method stub
ProjectDirectory projectDirectory = (ProjectDirectory) element;
switch (columnIndex) {
case 0:
return projectDirectory.getName();
case 1:
return projectDirectory.getPath();
}
return null;
}
对班级的呼吁是这样的：
tableViewer.setLabelProvider(new ProjectConfigTableLabelProvider());
为什么只能将标签提供者设置为列，这种方式不起作用？
答案 0 :(得分：1)
好的，我找到了解决问题的方法。
首先，我创建了一个复合材料，它将包含更大复合材料中的表格。
private Composite createPluginPathCreatedComposite(){
.................................
//Label of bigger composite
Text selectProjectPathText = new Text(pluginPathCreatedComposite, SWT.BORDER);
selectProjectPathText.setEnabled(false);
FormData selectProjectPathTextData = new FormData();
selectProjectPathTextData.top = new FormAttachment(selectProjectPathLabel, 0, SWT.CENTER);
selectProjectPathTextData.left = new FormAttachment(selectProjectPathLabel, 5,SWT.RIGHT);
selectProjectPathTextData.right = new FormAttachment(100,-55);
selectProjectPathText.setLayoutData(selectProjectPathTextData);
//Button to select a system directory
Button selectProjectPathButton = new Button(pluginPathCreatedComposite, SWT.NONE);
selectProjectPathButton.setText("Browse");
FormData selectProjectPathButtonData = new FormData();
selectProjectPathButtonData.top = new FormAttachment(selectProjectPathText, 0, SWT.TOP);
selectProjectPathButtonData.left = new FormAttachment(selectProjectPathText, 5, SWT.RIGHT);
selectProjectPathButtonData.right = new FormAttachment(100,-5);
selectProjectPathButton.setLayoutData(selectProjectPathButtonData);
selectProjectPathButton.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
DirectoryDialog dialog = new DirectoryDialog(Display.getCurrent().getActiveShell());
dialog.setFilterPath(""); // Windows specific
selectProjectPathText.setText(dialog.open());
}
});
//Create a composite for the table inside a bigger composite pluginPathCreatedComposite
Composite tableComposite = new Composite(pluginPathCreatedComposite, SWT.NONE);
FormData tableCompositeData = new FormData();
tableCompositeData.left = new FormAttachment(selectProjectPathLabel, 0, SWT.LEFT);
tableCompositeData.top = new FormAttachment(selectProjectPathLabel, 40, SWT.TOP);
tableCompositeData.right = new FormAttachment(selectProjectPathButton,-10,SWT.LEFT);
tableCompositeData.bottom = new FormAttachment(createProjectConfigButton,-10,SWT.TOP);
tableComposite.setLayoutData(tableCompositeData);
//Function to create the table.
createTable(tableComposite,selectProjectPathText);
//add row to the tableviewer
addRow.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
ProjectDirectory directory = new ProjectDirectory("Insert variable", "Click to add path");
projectCompositeViewer.add(directory);
}
});
//deleterow from the tableviewer
Button deleteRow = new Button(pluginPathCreatedComposite, SWT.NONE);
FormData deleteRowData = new FormData();
deleteRowData.top = new FormAttachment(addRow,5,SWT.BOTTOM);
deleteRowData.left = new FormAttachment(selectProjectPathButton,0,SWT.LEFT);
deleteRowData.right = new FormAttachment(selectProjectPathButton,0,SWT.RIGHT);
deleteRow.setLayoutData(deleteRowData);
deleteRow.setText("Delete");
deleteRow.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
ISelection selection = projectCompositeViewer.getSelection();
if (selection instanceof IStructuredSelection) {
Iterator iterator = ((IStructuredSelection) selection).iterator();
while (iterator.hasNext()) {
Object obj = iterator.next();
projectCompositeViewer.remove(obj);
}
}
}
});
}
创建表函数，我已经将表Composite和项目文件夹的路径作为参数传递：
private void createTable(Composite tableComposite, Text selectProjectPathText){
//Create the tableViewer and it´s columns
projectCompositeViewer = new ProjectConfigViewer(tableComposite, selectProjectPathText,SWT.SINGLE | SWT.FULL_SELECTION | SWT.H_SCROLL | SWT.V_SCROLL);
//Create an input to display
List<ProjectDirectory> b = new ArrayList<ProjectDirectory>();
b.add(new ProjectDirectory("AA", "FF"));
b.add(new ProjectDirectory("BB", "CC"));
Project pro = new Project("A", "B", 2, b);
projectCompositeViewer.setInput(pro);
}
ProjectConfigViewer代码：
public class ProjectConfigViewer extends TableViewer{
public ProjectConfigViewer(Composite parent, Text selectProjectPathText,int style)
{
super(parent, style);
Table table = getTable();
createColumns(parent, selectProjectPathText);
table.setHeaderVisible(true);
table.setLinesVisible(true);
//Specify Content provider
setContentProvider(new ProjectConfigTableContentProvider());
}
//Create the columns, column´s label providers and editingsuport to specify how will each column cell be: text column, dialog column...
private void createColumns(Composite parent,Text selectProjectPathText)
{
String[] COLUMN_HEADINGS = {"Variable", "Path"};
TableColumnLayout tableLayout = new TableColumnLayout();
parent.setLayout(tableLayout);
//Specify first column labelprovider and create it
TableViewerColumn variable = createTableViewerColumn(COLUMN_HEADINGS[0], 0);
variable.getColumn().setResizable(false);
variable.setLabelProvider(new ColumnLabelProvider(){
public String getText(Object element) {
if(element instanceof ProjectDirectory && element != null)
return ((ProjectDirectory)element).getName();
return super.getText(element);
}
});
//Specify second column labelprovider and create it
TableViewerColumn path = createTableViewerColumn(COLUMN_HEADINGS[1], 1);
path.getColumn().setResizable(false);
path.setLabelProvider(new ColumnLabelProvider(){
public String getText(Object element) {
if(element instanceof ProjectDirectory && element != null)
return ((ProjectDirectory)element).getPath();
return super.getText(element);
}
});
//Spedify the dimensions of each column
tableLayout.setColumnData(path.getColumn(), new ColumnWeightData(50));
tableLayout.setColumnData(variable.getColumn(), new ColumnWeightData(50));
//Specify setEditingSupport for each cell. First cell will be text, second will be a Dialog.
variable.setEditingSupport(new ProjectConfigVariableEditingSupport(this));
path.setEditingSupport(new ProjectConfigPathEditingSupport(this, selectProjectPathText));
}
//Create tableviewercolumns
private TableViewerColumn createTableViewerColumn(String header, int idx)
{
TableViewerColumn column = new TableViewerColumn(this, SWT.LEFT, idx);
column.getColumn().setText(header);
column.getColumn().setResizable(true);
column.getColumn().setMoveable(true);
return column;
}
}
内容提供商：
public class ProjectConfigTableContentProvider implements IStructuredContentProvider {
private List<ProjectDirectory> projectEntitiesList;
@Override
public Object[] getElements(Object arg0) {
// TODO Auto-generated method stub
if (arg0 instanceof Project){
Project project = (Project) arg0;
if (project != null && project.getProjectDirectoriesList() != null){
initializeTableProjectConfig(project);
return projectEntitiesList.toArray();
}
}
projectEntitiesList = new ArrayList<ProjectDirectory>();
return projectEntitiesList.toArray();
}
private void initializeTableProjectConfig(Project project){
try {
List<ProjectDirectory> listProjectDirectory = new ArrayList<ProjectDirectory>();
for (ProjectDirectory projectDirectory : project.getProjectDirectoriesList()) {
if (projectDirectory != null)
listProjectDirectory.add(projectDirectory);
}
this.projectEntitiesList = listProjectDirectory;
} catch (Exception e) {
e.printStackTrace();
}
}
}
编辑第一栏的支持：
public class ProjectConfigVariableEditingSupport extends EditingSupport {
private TextCellEditor cellEditor;
public ProjectConfigVariableEditingSupport(ColumnViewer viewer) {
super(viewer);
cellEditor = new TextCellEditor(((TableViewer)viewer).getTable());
}
protected CellEditor getCellEditor(Object element) {
return cellEditor;
}
protected boolean canEdit(Object element) {
return true;
}
protected Object getValue(Object element) {
return ((ProjectDirectory) element).getName();
}
@Override
protected void setValue(Object element, Object value) {
((ProjectDirectory) element).setName(String.valueOf(value));
getViewer().update(element, null);
}
}
编辑支持第二栏：
public class ProjectConfigPathEditingSupport extends EditingSupport{
private DialogCellEditor cellEditor;
//Pass selecProjectPathText of the bigger composite to brose from that directory
public ProjectConfigPathEditingSupport(ColumnViewer viewer, Text selectProjectPathText) {
super(viewer);
cellEditor = new DialogCellEditor(((TableViewer)viewer).getTable()) {
@Override
protected Object openDialogBox(Control cellEditorWindow) {
// TODO Auto-generated method stub
DirectoryDialog dialog = new DirectoryDialog(cellEditorWindow.getShell());
dialog.setText("Browse");
dialog.setFilterPath(selectProjectPathText.getText()); // Windows specific
return dialog.open();
}
};
}
protected CellEditor getCellEditor(Object element) {
return cellEditor;
}
protected boolean canEdit(Object element) {
return true;
}
protected Object getValue(Object element) {
return ((ProjectDirectory) element).getPath();
}
protected void setValue(Object element, Object value)
{
((ProjectDirectory) element).setPath(String.valueOf(value));
getViewer().update(element, null);
}
}
模型类：
public class Project {
private String name;
private String path;
private Integer quantity;
private List<ProjectDirectory> projectDirectoryList;
//Constructor
public Project(String name, String path, Integer quantity, List<ProjectDirectory> projectDirectoriesList) {
super();
this.name = name;
this.path = path;
this.quantity = quantity;
this.projectDirectoryList = projectDirectoriesList;
}
//GETTERS AND SETTERS
}
public class ProjectDirectory {
private String name;
private String path;
//Constructor
public ProjectDirectory(String name, String path) {
super();
this.path = path;
this.name = name;
}
//Getters & setters
答案 1 :(得分：0)
此问题的最简单原因之一是在创建列之前添加了标签提供程序。一定要确保以后会添加标签提供者！
