使用DecoratedField装饰SWT Control

 

DecoratedField用来实现对Control的装饰，可以为button,combo,text等控件做出如下效果。

控件边上提示的种类有4种，分别是Proposal, Required, error, warning.

代码很简单：

package jface;

import org.eclipse.jface.fieldassist.DecoratedField;
import org.eclipse.jface.fieldassist.FieldDecoration;
import org.eclipse.jface.fieldassist.FieldDecorationRegistry;
import org.eclipse.jface.fieldassist.IControlCreator;
import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

/** *//**
 * This class demonstrates TableViewers
 */
public class FieldDecorationDemo ...{

    public void run() ...{
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setSize(200, 200);
        shell.setText("Button Example");
        shell.setLayout(new GridLayout());

        createFieldDecoration(shell);

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

    private void createFieldDecoration(Shell shell) ...{
        createCombo(shell);
        createButton(shell);
        createText(shell);
    }

    private void createText(Shell shell) ...{
        IControlCreator cbCtrl = new IControlCreator() ...{

            public Control createControl(final Composite parent, final int style) ...{
                Text text = new Text(parent, style);
                text.setText("text");
                return text;
            }
        };
        DecoratedField dField = new DecoratedField(shell, SWT.BORDER, cbCtrl);
        FieldDecoration decoration = FieldDecorationRegistry.getDefault().getFieldDecoration(FieldDecorationRegistry.DEC_ERROR);
        dField.addFieldDecoration(decoration, SWT.LEFT | SWT.TOP, false);
    }

    private void createButton(Shell shell) ...{
        IControlCreator cbCtrl = new IControlCreator() ...{

            public Control createControl(final Composite parent, final int style) ...{
                Button button = new Button(parent, style);
                button.setText("button");
                return button;
            }
        };
        DecoratedField dField = new DecoratedField(shell, SWT.BORDER, cbCtrl);
        FieldDecoration decoration = FieldDecorationRegistry.getDefault().getFieldDecoration(
                FieldDecorationRegistry.DEC_CONTENT_PROPOSAL);
        dField.addFieldDecoration(decoration, SWT.LEFT | SWT.TOP, false);
    }

    private void createCombo(Shell shell) ...{
        IControlCreator cbCtrl = new IControlCreator() ...{

            public Control createControl(final Composite parent, final int style) ...{
                Combo cb = new Combo(parent, style);
                cb.setText("combo");
                return cb;
            }
        };
        DecoratedField dField = new DecoratedField(shell, SWT.BORDER, cbCtrl);
        FieldDecoration decoration = FieldDecorationRegistry.getDefault()
                .getFieldDecoration(FieldDecorationRegistry.DEC_REQUIRED);
        dField.addFieldDecoration(decoration, SWT.RIGHT | SWT.TOP, false);
    }

    public static void main(String[] args) ...{
        new FieldDecorationDemo().run();
    }
}