Eclipse RCP - 通过拖放箭头来组合表行
我是RCP开发的新手。
我想创建两个表，每个表包含不同的数据。 来自两个表的数据具有1对1，1对多或多对1的关系。 这可以通过在两个表之间绘制箭头来完成。 例如，
**Row 1** **Row 2**
R1 V1 R2 V1
R1 V2 R2 V2
R1 V3 R2 V3
我想从R1V1到（R2V1和R2V3）绘制箭头，反之亦然。 如何以图形方式显示它。
如何找到箭头组合的行。
感谢任何帮助。
--- Mandar
3 个答案:
答案 0 :(得分：2)
这是一个非常难以实施的组件，我不久前为Tibco Business Studio做了其中一个。
您需要在两个表之间放置一个Canvas来绘制链接。您可能拥有两个表的数据模型，您还需要第三个模型来存储链接，并确保对此模型的任何修改都会触发刷新Canvas。
接下来向这两个表添加drag and drop支持，将表1中的项目放到表2上应该在链接模型中创建一个新项目（从而触发Canvas刷新以绘制链接）。
实际上在正确的位置绘制链接，你必须自己解决，但希望这会给你一些想法。
答案 1 :(得分：2)
以下是基于Nick提出的想法的代码。这只是为那些可能想知道从哪里开始实现如下所示的内容的人提出一个想法
这将允许您单击左侧表格中的任何列，然后在鼠标向右移动时绘制一条线，并在选择右侧表格后立即锚定线条。它在链表中保留左表行和右表行之间的映射作为映射数据模型。
package sample;
import java.util.LinkedList;
import org.eclipse.draw2d.AutomaticRouter;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.FreeformLayeredPane;
import org.eclipse.draw2d.FreeformLayout;
import org.eclipse.draw2d.LightweightSystem;
import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.PolylineConnection;
import org.eclipse.draw2d.PolylineDecoration;
import org.eclipse.draw2d.XYAnchor;
import org.eclipse.draw2d.geometry.PointList;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
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 GraphicTableMapper {
private static Point sourcePosition;
private static PathFigure currentPath;
private static Figure bf;
private static Canvas canvas;
private static int sourceRow;
private static int targetRow;
private static LinkedList<RowMapper> rowmapList = new LinkedList<RowMapper>();
public static void main(String[] args) {
Display display = Display.getDefault();
final Shell shell = new Shell(display);
shell.setSize(550, 500);
shell.setLayout(new GridLayout(3, false));
final Table table = new Table(shell, SWT.MULTI | SWT.BORDER
| SWT.FULL_SELECTION);
table.setLinesVisible(true);
table.setHeaderVisible(true);
final String[] titles = { "Serial Number", "Whatever" };
for (int i = 0; i < titles.length; i++) {
TableColumn column = new TableColumn(table, SWT.NONE);
column.setText(titles[i]);
}
int count = 100;// create 100 rows in table
for (int i = 0; i < count; i++) {
TableItem item = new TableItem(table, SWT.NONE);
item.setText(0, "x");
item.setText(1, "y");
item.setText(2, "!");
item.setText(3, "this stuff behaves the way I expect");
item.setText(4, "almost everywhere");
item.setText(5, "some.folder");
item.setText(6, "line " + i + " in nowhere");
}
for (int i = 0; i < titles.length; i++) {
table.getColumn(i).pack();
}
table.addListener(SWT.MouseDown, new Listener() {
public void handleEvent(Event event) {
Point pt = new Point(event.x, event.y);
TableItem item = table.getItem(pt);
if (item == null)
return;
for (int i = 0; i < titles.length; i++) {
Rectangle rect = item.getBounds(i);
if (rect.contains(pt)) {
int index = table.indexOf(item);
System.out.println("Item " + index + "-" + i);
sourcePosition = pt;
sourceRow = index;
currentPath = new PathFigure();
currentPath.setSourceAnchor(new XYAnchor(
new org.eclipse.draw2d.geometry.Point(-10,
event.y)));
currentPath
.setTargetAnchor(new XYAnchor(
new org.eclipse.draw2d.geometry.Point(
0, pt.y)));
bf.add(currentPath);
}
}
}
});
table.addMouseMoveListener(new MouseMoveListener() {
public void mouseMove(MouseEvent arg0) {
if (currentPath != null) {
((XYAnchor) (currentPath.getTargetAnchor()))
.setLocation(new org.eclipse.draw2d.geometry.Point(
0, arg0.y));
}
}
});
canvas = new Canvas(shell, SWT.None);
canvas.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_GREEN));
LightweightSystem lws = new LightweightSystem(canvas);
bf = new BaseFigure();
lws.setContents(bf);
canvas.addMouseMoveListener(new MouseMoveListener() {
public void mouseMove(MouseEvent arg0) {
if (currentPath != null) {
((XYAnchor) (currentPath.getTargetAnchor()))
.setLocation(new org.eclipse.draw2d.geometry.Point(
arg0.x > canvas.getSize().x - 5 ? canvas
.getSize().x - 5 : arg0.x, arg0.y));
}
}
});
GridData data2 = new GridData();
data2.verticalAlignment = SWT.TOP;
data2.grabExcessHorizontalSpace = false;
data2.grabExcessVerticalSpace = true;
data2.horizontalIndent = -10;
data2.widthHint = 200;
data2.heightHint = 1000;
canvas.setLayoutData(data2);
final Table table2 = new Table(shell, SWT.MULTI | SWT.BORDER
| SWT.FULL_SELECTION);
table2.setLinesVisible(true);
table2.setHeaderVisible(true);
data2 = new GridData();
data2.grabExcessHorizontalSpace = false;
data2.horizontalIndent = -10;
table2.setLayoutData(data2);
final String[] titles2 = { "Serial Number", "Whatever" };
for (int i = 0; i < titles.length; i++) {
TableColumn column = new TableColumn(table2, SWT.NONE);
column.setText(titles[i]);
canvas.redraw();
}
table2.addMouseMoveListener(new MouseMoveListener() {
public void mouseMove(MouseEvent event) {
if (currentPath != null) {
Point pt = new Point(event.x, event.y);
TableItem item = table2.getItem(pt);
if (item == null)
return;
for (int i = 0; i < titles2.length; i++) {
Rectangle rect = item.getBounds(i);
if (rect.contains(pt)) {
((XYAnchor) (currentPath.getTargetAnchor()))
.setLocation(new org.eclipse.draw2d.geometry.Point(
canvas.getSize().x - 5, event.y));
}
}
}
}
});
int count2 = 100;// create 100 rows in table 2
for (int i = 0; i < count2; i++) {
TableItem item = new TableItem(table2, SWT.NONE);
item.setText(0, "x");
item.setText(1, "y");
item.setText(2, "!");
item.setText(3, "this stuff behaves the way I expect");
item.setText(4, "almost everywhere");
item.setText(5, "some.folder");
item.setText(6, "line " + i + " in nowhere");
}
for (int i = 0; i < titles.length; i++) {
table2.getColumn(i).pack();
}
table2.addListener(SWT.MouseDown, new Listener() {
public void handleEvent(Event event) {
try {
Point pt = new Point(event.x, event.y);
TableItem item = table2.getItem(pt);
if (item == null)
return;
for (int i = 0; i < titles2.length; i++) {
Rectangle rect = item.getBounds(i);
if (rect.contains(pt)) {
int index = table2.indexOf(item);
targetRow = index;
System.out.println("Item " + index + "-" + i);
if (sourcePosition != null) {
add(event);
}
}
}
} finally {
sourcePosition = null;
sourceRow = -1;
targetRow = -1;
}
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
}
public static void add(Event event) {
bf.remove(currentPath);
PathFigure figure = new PathFigure();
figure.setSourceAnchor(currentPath.getSourceAnchor());
figure.setTargetAnchor(currentPath.getTargetAnchor());
bf.add(figure);
currentPath = null;
RowMapper mapper = new RowMapper();
mapper.sourceRow = sourceRow;
mapper.targetRow = targetRow;
if (!rowmapList.contains(mapper)) {
rowmapList.add(mapper);
}
}
class BaseFigure extends FreeformLayeredPane {
public BaseFigure() {
setLayoutManager(new FreeformLayout());
setBorder(new MarginBorder(5));
setBackgroundColor(ColorConstants.white);
setOpaque(true);
}
}
class PathFigure extends PolylineConnection {
public PathFigure() {
setTargetDecoration(new PolylineDecoration());
setConnectionRouter(new AutomaticRouter() {
@Override
protected void handleCollision(PointList list, int index) {
}
});
}
}
class RowMapper {
int sourceRow;
int targetRow;
@Override
public boolean equals(Object obj) {
if (obj instanceof RowMapper) {
RowMapper mapper = (RowMapper) obj;
return (sourceRow == mapper.sourceRow && targetRow == mapper.targetRow);
}
return false;
}
}
答案 2 :(得分：0)
我是否认为此实现使用鼠标位置绘制箭头？因此，如果你想保存/加载一个关系，你必须保存箭头的x，y位置，你必须确保你的组件始终保持相同的大小？
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