如何根据较短的文本包装长文本标签？

Question

我在JFace对话框中得到了两个标签。一个带有短文本，一个带有长文本。我希望只要长度超过短文本的长度（不应该被包装），就包装长文本。

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;

public class TestDialog {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);

        MyTestDialog dialog = new MyTestDialog(shell);
        dialog.open();

        shell.dispose();

        while (!shell.isDisposed()) {
          if (!display.readAndDispatch())
            display.sleep();
        }
        display.dispose();
    }
}

class MyTestDialog extends Dialog {

    public MyTestDialog(Shell parent) {
        super(parent);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite container = (Composite) super.createDialogArea(parent);
        container.setLayoutData(new GridData(SWT.NONE, SWT.TOP, true, false));

        Label lbl1 = new Label(container, SWT.NONE);
        GridData lbl1griddata = new GridData(SWT.CENTER, SWT.CENTER, false, false);
        lbl1.setLayoutData(lbl1griddata);
        lbl1.setText("This is a short text. Shorter than the other.");

        Label lbl2 = new Label(container, SWT.WRAP);
        lbl2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        lbl2.setText("Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.");

        return container;
    }
}

Answer 1

我认为您必须计算出第一个标签文本的长度，并使用它作为第二个标签布局的宽度提示：

Label lbl1 = new Label(container, SWT.NONE);
GridData lbl1griddata = new GridData(SWT.CENTER, SWT.CENTER, false, false);
lbl1.setLayoutData(lbl1griddata);
lbl1.setText("This is a short text. Shorter than the other.");

GC gc = new GC(lbl1.getDisplay());
int width = gc.textExtent(lbl1.getText()).x;
gc.dispose();

Label lbl2 = new Label(container, SWT.WRAP);
GridData data = new GridData(SWT.FILL, SWT.CENTER, true, false);
data.widthHint = width;
lbl2.setLayoutData(data);
lbl2.setText("Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.");