我正在尝试像在Excel中一样选择多个单元格。截至目前，我成功地选择了表行和表列。但是没有运气在tableviewer中选择部分细胞。
答案 0 :(得分：0)
我认为你应该看一下swt TableCursor。它们可用于浏览表格，也可用于单独选择单元格。您可以参考下面的代码https://github.com/skumbha/swt/blob/master/TestCourser.java
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TableCursor;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
public class TestCourser extends Dialog {
private Table table;
private TableCursor tableCursor;
private Point selectionStartPoint ;
private volatile boolean shiftKeyPressed;
private volatile boolean ctrlKeyPressed;
private List<Point> currentSelection = new ArrayList<>();
/**
* Create the dialog.
* @param parentShell
*/
public TestCourser(Shell parentShell) {
super(parentShell);
}
/**
* Create contents of the dialog.
* @param parent
*/
@Override
protected Control createDialogArea(Composite parent) {
Composite container = (Composite) super.createDialogArea(parent);
container.setLayout(new GridLayout(1, false));
Composite composite = new Composite(container, SWT.NONE);
composite.setLayout(new GridLayout(1, false));
composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
final TableViewer tableViewer = new TableViewer(composite, SWT.BORDER| SWT.FULL_SELECTION | SWT.HIDE_SELECTION);
table = tableViewer.getTable();
table.setLinesVisible(true);
table.setHeaderVisible(true);
table.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
disableSWTTableCellSelection(tableViewer);
attachMouseCellSelectionListener(tableViewer);
TableViewerColumn tableViewerColumn = new TableViewerColumn(tableViewer, SWT.NONE);
TableColumn tblclmnItem = tableViewerColumn.getColumn();
tblclmnItem.setWidth(100);
tblclmnItem.setText("Item0");
TableViewerColumn tableViewerColumn_1 = new TableViewerColumn(tableViewer, SWT.NONE);
TableColumn tblclmnItem_1 = tableViewerColumn_1.getColumn();
tblclmnItem_1.setWidth(100);
tblclmnItem_1.setText("Item1");
TableViewerColumn tableViewerColumn_2 = new TableViewerColumn(tableViewer, SWT.NONE);
TableColumn tblclmnItem_2 = tableViewerColumn_2.getColumn();
tblclmnItem_2.setWidth(100);
tblclmnItem_2.setText("Item2");
tableCursor = new TableCursor(table, SWT.NONE);
tableCursor.setBackground(new Color(null, 255, 204, 102) );
tableCursor.addKeyListener(new KeyListener() {
@Override
public void keyReleased(KeyEvent e) {
if(e.keyCode == SWT.SHIFT){
selectionStartPoint = new Point(-1, -1);
shiftKeyPressed = false;
return;
}
if(e.keyCode == SWT.CTRL){
ctrlKeyPressed = false;
return;
}
if(!((e.stateMask & SWT.SHIFT) != 0)){
clearSelection(currentSelection,tableViewer);
}
}
@Override
public void keyPressed(KeyEvent e) {
if((e.keyCode == SWT.SHIFT) && shiftKeyPressed==false){
selectionStartPoint = tableCursor.getLocation();
shiftKeyPressed = true;
}
if((e.keyCode == SWT.CTRL) && ctrlKeyPressed==false){
selectionStartPoint = tableCursor.getLocation();
ctrlKeyPressed = true;
}
if(ctrlKeyPressed && !shiftKeyPressed){
if(e.keyCode == SWT.ARROW_RIGHT){
tableCursor.setSelection(table.indexOf(tableCursor.getRow()), tableViewer.getTable().getColumnCount()-1);
return;
}
if(e.keyCode == SWT.ARROW_LEFT){
tableCursor.setSelection(table.indexOf(tableCursor.getRow()), 0);
return;
}
if(e.keyCode == SWT.ARROW_UP){
tableCursor.setSelection(0, tableCursor.getColumn());
return;
}
if(e.keyCode == SWT.ARROW_DOWN){
tableCursor.setSelection(tableViewer.getTable().getItemCount()-1, tableCursor.getColumn());
return;
}
}
if (shiftKeyPressed && ctrlKeyPressed) {
if(e.keyCode == SWT.ARROW_RIGHT){
tableCursor.setSelection(table.indexOf(tableCursor.getRow()), tableViewer.getTable().getColumnCount()-1);
selectCellsOnArrowKeys(tableViewer, e);
return;
}
if(e.keyCode == SWT.ARROW_LEFT){
tableCursor.setSelection(table.indexOf(tableCursor.getRow()), 0);
selectCellsOnArrowKeys(tableViewer, e);
return;
}
if(e.keyCode == SWT.ARROW_UP){
tableCursor.setSelection(0, tableCursor.getColumn());
selectCellsOnArrowKeys(tableViewer, e);
return;
}
if(e.keyCode == SWT.ARROW_DOWN){
tableCursor.setSelection(tableViewer.getTable().getItemCount()-1, tableCursor.getColumn());
selectCellsOnArrowKeys(tableViewer, e);
return;
}
}
if ((e.keyCode == SWT.ARROW_UP) || (e.keyCode == SWT.ARROW_DOWN) || (e.keyCode == SWT.ARROW_LEFT) || (e.keyCode == SWT.ARROW_RIGHT) ) {
selectCellsOnArrowKeys(tableViewer, e);
}
}
private void selectCellsOnArrowKeys(final TableViewer tableViewer, KeyEvent e) {
if((e.stateMask & SWT.SHIFT) != 0){
Point selectionEndPoint = tableCursor.getLocation();
List<Point> cellsTobeSelected = getAllCellsBetweenTwoCells(selectionStartPoint,selectionEndPoint,tableViewer);
if(cellsTobeSelected!=null){
clearSelection(currentSelection,tableViewer);
highlightCells(cellsTobeSelected, tableViewer);
currentSelection.addAll(cellsTobeSelected);
}
}
}
});
TableItem tableItem = new TableItem(table, SWT.NONE);
tableItem.setText(0,"R0C0");
tableItem.setText(1,"R0C1");
tableItem.setText(2,"R0C2");
TableItem tableItem1 = new TableItem(table, SWT.NONE);
tableItem1.setText(0,"R1C0");
tableItem1.setText(1,"R1C1");
tableItem1.setText(2,"R1C2");
TableItem tableItem2 = new TableItem(table, SWT.NONE);
tableItem2.setText(0,"R2C0");
tableItem2.setText(1,"R2C1");
tableItem2.setText(2,"R2C2");
TableItem tableItem3 = new TableItem(table, SWT.NONE);
tableItem3.setText(0,"R3C0");
tableItem3.setText(1,"R3C1");
tableItem3.setText(2,"R3C2");
TableItem tableItem4 = new TableItem(table, SWT.NONE);
tableItem4.setText(0,"R4C0");
tableItem4.setText(1,"R4C1");
tableItem4.setText(2,"R4C2");
return container;
}
private void attachMouseCellSelectionListener(final TableViewer tableViewer) {
tableViewer.getTable().addMouseListener(new MouseAdapter() {
private Point selectionEndPoint ;
public void mouseDown(MouseEvent e) {
clearSelection(currentSelection,tableViewer);
if(e.button == 1 && (e.stateMask & SWT.SHIFT) != 0){
selectionEndPoint = new Point(e.x, e.y);
List<Point> cellsTobeSelected = getAllCellsBetweenTwoCells(selectionStartPoint,selectionEndPoint,tableViewer);
if(cellsTobeSelected!=null){
clearSelection(currentSelection,tableViewer);
highlightCells(cellsTobeSelected, tableViewer);
currentSelection.addAll(cellsTobeSelected);
}
}
}
@Override
public void mouseUp(MouseEvent e) {
}
});
}
private void disableSWTTableCellSelection(final TableViewer tableViewer) {
tableViewer.addSelectionChangedListener(new ISelectionChangedListener() {
private boolean update;
private ISelection lastSelection;
@Override
public void selectionChanged(SelectionChangedEvent event) {
if (event.getSelection().isEmpty() && !update) {
update = true;
tableViewer.setSelection(lastSelection);
update = false;
} else if (!event.getSelection().isEmpty()) {
lastSelection = event.getSelection();
}
}
});
}
private void clearSelection(List<Point> currentSelection,TableViewer tableViewer){
for(Point cell: currentSelection){
tableViewer.getTable().getItem(cell.x).setBackground(cell.y, new Color(null, 255, 255, 255));
}
currentSelection.clear();
}
private void highlightCells(List<Point> cellsTobeHighlight,TableViewer tableViewer) {
for(Point cell : cellsTobeHighlight){
tableViewer.getTable().getItem(cell.x).setBackground(cell.y, new Color(null, 255, 204, 102));
}
}
private Point getCellId(Point mouseLocation,TableViewer tableViewer){
ViewerCell cell = tableViewer.getCell(mouseLocation);
if(cell==null){
return null;
}
int columnIndex = cell.getColumnIndex();
int rowIndex = tableViewer.getTable().indexOf((TableItem)cell.getItem()) ;
return new Point(rowIndex, columnIndex);
}
private List<Point> getAllCellsBetweenTwoCells(Point selectionStartPoint,Point selectionEndPoint,TableViewer tableViewer){
List<Point> currentSelection = new ArrayList<>();
Point startCell = getCellId(selectionStartPoint,tableViewer);
Point endCell = getCellId(selectionEndPoint,tableViewer);
if(startCell==null || endCell==null){
return null;
}
int minX = Math.min(startCell.x, endCell.x);
int minY = Math.min(startCell.y, endCell.y);
int maxX = Math.max(startCell.x, endCell.x);
int maxY = Math.max(startCell.y, endCell.y);
int tmpMaxY;
while(minX<=maxX){
tmpMaxY = maxY;
while(minY<=tmpMaxY){
Point cell = new Point(maxX,tmpMaxY);
currentSelection.add(cell);
tmpMaxY--;
}
maxX--;
}
return currentSelection;
}
/**
* Create contents of the button bar.
* @param parent
*/
@Override
protected void createButtonsForButtonBar(Composite parent) {
createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
}
/**
* Return the initial size of the dialog.
*/
@Override
protected Point getInitialSize() {
return new Point(766, 472);
}
public static void main(String[] args) {
TestCourser testCourser = new TestCourser(new Shell());
testCourser.open();
}
}