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我正在使用 Eclipse 4.2 RC1 开发一个 e4 RCP 应用程序。

我有一个Composite包含多个TableViewers 的控件 ( )。观众是垂直排列的。如果用户在选择表的最后一个元素时点击向下箭头，我希望下一个表（如下）的第一个元素被选中。相反，如果第一个元素被选中并按下向上箭头，我希望上一个表（上图）的最后一个元素被选中。因为我的列设置，不可能使用单个TableViewer. 在控件的初始化程序中调用以下函数，所有查看器都作为参数传递：

private void init(IEclipseContext context, IMDecisionTable input, DecisionTableTable...viewers) {
    for (int i = 0; i < viewers.length; i++) {
        viewers[i].hookMenuSupport(context);
        viewers[i].setInput(input);
        viewers[i].getTable().addTraverseListener(new TraverseSelector(
            i > 0 ? viewers[i-1] : null, i < viewers.length - 1 ? viewers[i+1] : null
        ));
    }
}

`TraverseSelector 是我控制的一个嵌套类：

public class TraverseSelector implements TraverseListener {
    public DecisionTableTable p, n;

    public TraverseSelector(DecisionTableTable previous, DecisionTableTable next) {
        p = previous; n = next;
    }

    @Override public void keyTraversed(TraverseEvent e) {
        if (e.getSource() instanceof Table) {
            Table t = (Table) e.getSource();
            if (e.keyCode == SWT.ARROW_UP && p != null && t.getSelectionIndex() == 0) {
                select(p, -1, true);
                e.detail = SWT.TRAVERSE_NONE;
                e.doit = true;
                p.getTable().setFocus();
            } else if (e.keyCode == SWT.ARROW_DOWN && n != null && t.getSelectionIndex() == t.getItemCount() - 1) {
                select(n, 0, true);
                e.detail = SWT.TRAVERSE_NONE;
                e.doit = true;
                n.getTable().setFocus();
            }
        }
    }
}

当条件满足时，它会尝试适当地设置选择。控件类中的其他相关代码：

private boolean selecting = false;
private ISelection selection = null;
@Override public ISelection getSelection() { return selection; }
@Override public void setSelection(ISelection sel, boolean reveal) {
    if (!selecting) {
        synchronized (this) { selecting = true; }
        selection = sel;
        for (TableViewer viewer : Arrays.asList(ftable, ctable, iatable, catable, pstable))
            viewer.setSelection(selection, reveal);
        synchronized (this) { selecting = false; }
    }
}
@Override public void selectionChanged(SelectionChangedEvent event) {
    if (!selecting) {
        synchronized (this) { selecting = true; }
        selection = event.getSelection();
        for (ISelectionProvider sp : Arrays.asList(ftable, ctable, iatable, catable, pstable))
            if (event.getSelectionProvider() != sp)
                sp.setSelection(null);
        synchronized (this) { selecting = false; }
    }
}
private void select(DecisionTableTable viewer, int index, boolean reveal) {
    Table t = viewer.getTable(); int count = t.getItemCount();
    setSelection(new StructuredSelection(t.getItem((index + count) % count).getData()), reveal);
}

我的困惑在于这两行e.detail = SWT.TRAVERSE_NONE;和e.doit = true;。如果我删除这两个语句，事情就不起作用了。如果我删除这些和setFocus语句，则选择设置为当前表的第一个或最后一个元素，在单个表中循环选择。detail在这些陈述之前，doit分别为 32 和错误。

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2 回答 2

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我认为你的问题在于你的select(DecisionTableTable, int, boolean)方法。我不确定重写setSelection\selectionChanged方法的确切效果，但它们似乎过于复杂。您能否通过以下方式满足您的要求：

private void select(DecisionTableTable viewer, int index, boolean reveal) {
    int count = viewer.getTable().getItemCount();
    viewer.setSelection(new StructuredSelection(viewer.getElementAt((index + count) % count), reveal);
}

另外我认为您应该在doit=false切换表格时进行设置，因为您不希望将事件应用于当前表格。

于 2012-05-25T16:08:35.637 回答
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对我有用的是实现 KeyListener 而不是 TransverseListener 并e.doit = false;在键侦听器中添加该行。似乎某种事件传播导致了另一个选择，上面的行停止了所述传播。这是我的最终代码：

private boolean selecting;
private ISelection selection = null;
@Override public ISelection getSelection() { return selection; }
@Override public void setSelection(ISelection sel, boolean reveal) {
    if (!selecting) {
        synchronized (this) { selecting = true; }
        selection = sel;
        for (DecisionTableTable viewer : Arrays.asList(ftable, ctable, iatable, catable, pstable))
            viewer.setSelection(selection, reveal);
        synchronized (this) { selecting = false; }
    }
}
@Override public void selectionChanged(SelectionChangedEvent event) {
    if (!selecting) {
        synchronized (this) { selecting = true; }
        selection = event.getSelection();
        for (DecisionTableTable viewer : Arrays.asList(ftable, ctable, iatable, catable, pstable))
            if (event.getSelectionProvider() != viewer)
                viewer.setSelection(selection);
        synchronized (this) { selecting = false; }
    }
}

public class KeyHandler extends KeyAdapter {
    public DecisionTableTable p, n;

    public KeyHandler(DecisionTableTable previous, DecisionTableTable next) {
        p = previous; n = next;
    }

    @Override public void keyPressed(KeyEvent e) {
        if (e.getSource() instanceof Table) {
            Table t = (Table) e.getSource();
            if (e.keyCode == SWT.ARROW_UP && p != null && t.getSelectionIndex() == 0) {
                p.getTable().setFocus();
                p.setSelection(new StructuredSelection(p.getElementAt(p.getTable().getItemCount() - 1)));
                e.doit = false;
            } else if (e.keyCode == SWT.ARROW_DOWN && n != null && t.getSelectionIndex() == t.getItemCount() - 1) {
                n.getTable().setFocus();
                n.setSelection(new StructuredSelection(n.getElementAt(0)));
                e.doit = false;
            }
        }
    }
}
于 2012-05-29T17:02:26.427 回答