如何相对于向导获得控制界限

Question

我希望我能解释我的问题。我正在使用一个对话框，该对话框可以包含左侧的树数，而从右侧则一棵树。我需要从左到右绘制一条线，但是由于某种原因，我获得了相同的树项目边界。例如，当第一个项目在树一个中选择第一个项目时，它将返回树二中第一个项目的相同边界位置。我如何获得相对于向导而不是复合材料的项目界限。

这是代码：

import org.eclipse.draw2d.ColorConstants;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TreeItem;
public class SWTSashForm
{
    public static void main (String [] args) {
        Display display = new Display ();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        SashForm sashForm = new SashForm(shell, SWT.HORIZONTAL);

        Composite composite = new Composite(sashForm, SWT.NONE);
        composite.setLayout(new GridLayout());
        composite.setLayoutData(new GridData(GridData.FILL_BOTH));
        composite.setBackground(ColorConstants.white);

        for (int i = 0; i < 3; i++) {
            Label lbl = new Label(composite, SWT.NONE);
            lbl.setText("Tree " + i);
            // Configure scrolled composite
            ScrolledComposite scrolledComposite = new ScrolledComposite(composite, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER);
            scrolledComposite.setLayout(new GridLayout());
            scrolledComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
            scrolledComposite.setExpandVertical(true);
            scrolledComposite.setExpandHorizontal(true);
            scrolledComposite.setAlwaysShowScrollBars(true);
            scrolledComposite.setMinSize(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT));
            // Add content to scrolled composite
            Composite scrolledContent = new Composite(scrolledComposite, SWT.NONE);
            scrolledContent.setLayout(new GridLayout());
            GridData gridData = new GridData();
            gridData.horizontalAlignment = SWT.FILL;
            gridData.grabExcessHorizontalSpace = true;
            gridData.verticalAlignment = SWT.FILL;
            gridData.grabExcessVerticalSpace = true;
            scrolledContent.setLayoutData(gridData);
            scrolledComposite.setContent(scrolledContent);
            final TreeViewer tree = new TreeViewer(scrolledContent);
            for(int loopIndex0 = 0; loopIndex0 < 10; loopIndex0++) {
                TreeItem treeItem0 = new TreeItem(tree.getTree(), 0);
                treeItem0.setText("Level 0 Item "+ loopIndex0);
                for(int loopIndex1 = 0; loopIndex1 < 10; loopIndex1++) {
                    TreeItem treeItem1 = new TreeItem(treeItem0, 0);
                    treeItem1.setText("Level 1 Item "+ loopIndex1);
                    for(int loopIndex2 = 0; loopIndex2 < 10; loopIndex2++) {
                        TreeItem treeItem2 = new TreeItem(treeItem1, 0);
                        treeItem2.setText("Level 2 Item "+ loopIndex2);
                    }
                }
            }
            tree.getTree().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));

            tree.getTree().addListener(SWT.Selection, new Listener() {
                public void handleEvent(Event e) {
                    TreeItem[] selection = tree.getTree().getSelection();
                    for (int i = 0; i < selection.length; i++){
                        TreeItem item = selection[i];
                        Rectangle bounds = item.getBounds();
                        System.out.println("Tree item bounds y " + bounds.y  );
                    }
                } });
        }
        new TreeViewer(sashForm);
        shell.open();
        while (!shell.isDisposed ()) {
            if (!display.readAndDispatch ()) display.sleep ();
        }
        display.dispose ();
    }
}

Answer 1

项目边界始终与父树相对。

您可以使用以下方式将位置转换为相对于显示的位置：

Point displayPos = tree.getTree().toDisplay(bounds.x, bounds.y);

，然后使用以下方式将此位置转换为相对于另一个控件（例如外壳）。

Point pos = shell.toControl(displayPos);