Question

我使用WindowBuilderPro编写了一个程序，它运行正常。但是，我现在想在一个新项目中重用这两个类，但是当我将第一个类复制到项目中时，我从Eclipse中得到了2个错误。这是SSCCE证明问题：

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JLabel;
import java.awt.Font;
import org.eclipse.wb.swing.FocusTraversalOnArray;
import java.awt.Component;

public class ExampleFrame extends JFrame {

    private JPanel contentPane;
    private JTextField textField;
    private JTextField textField_1;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ExampleFrame frame = new ExampleFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public ExampleFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        textField = new JTextField();
        textField.setBounds(106, 32, 74, 28);
        contentPane.add(textField);
        textField.setColumns(10);

        JLabel lblNewLabel = new JLabel("Box 1");
        lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 18));
        lblNewLabel.setBounds(31, 39, 46, 14);
        contentPane.add(lblNewLabel);

        JLabel lblBox = new JLabel("Box 2");
        lblBox.setFont(new Font("Tahoma", Font.PLAIN, 18));
        lblBox.setBounds(31, 101, 46, 14);
        contentPane.add(lblBox);

        textField_1 = new JTextField();
        textField_1.setColumns(10);
        textField_1.setBounds(106, 94, 74, 28);
        contentPane.add(textField_1);
        contentPane.setFocusTraversalPolicy(new FocusTraversalOnArray(new Component[]{lblNewLabel, textField, lblBox, textField_1}));
    }
}

我得到的两个错误如下：

The import org.eclipse cannot be resolved

就行了

import org.eclipse.wb.swing.FocusTraversalOnArray;

和

FocusTraversalOnArray cannot be resolved to a type

在

行

contentPane.setFocusTraversalPolicy(new FocusTraversalOnArray(new Component[]{lblNewLabel, textField, lblBox, textField_1}));

当设置Tab键顺序时会出现这些行。有谁知道如何克服这个问题？考虑到Java的重点是能够重用组件，这似乎是一个很大的错误。

Answer 1

我需要将旧项目中使用的所有库添加到新项目的构建路径中。

Answer 2

复制一个由Window Builder创建的类后，我遇到了同样的问题。我发现我错过了以下文件：

\src\org\eclipse\wb\swinger\FocusTraversalOnArray.java

这似乎是Window Builder外部添加的唯一文件。我会在这里发布代码以防任何人需要它。

/*******************************************************************************
 * Copyright (c) 2011 Google, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Google, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.wb.swing;

import java.awt.Component;
import java.awt.Container;
import java.awt.FocusTraversalPolicy;

/**
 * Cyclic focus traversal policy based on array of components.
 * <p>
 * This class may be freely distributed as part of any application or plugin.
 * 
 * @author scheglov_ke
 */
public class FocusTraversalOnArray extends FocusTraversalPolicy {
    private final Component m_Components[];
    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    public FocusTraversalOnArray(Component components[]) {
        m_Components = components;
    }
    ////////////////////////////////////////////////////////////////////////////
    //
    // Utilities
    //
    ////////////////////////////////////////////////////////////////////////////
    private int indexCycle(int index, int delta) {
        int size = m_Components.length;
        int next = (index + delta + size) % size;
        return next;
    }
    private Component cycle(Component currentComponent, int delta) {
        int index = -1;
        loop : for (int i = 0; i < m_Components.length; i++) {
            Component component = m_Components[i];
            for (Component c = currentComponent; c != null; c = c.getParent()) {
                if (component == c) {
                    index = i;
                    break loop;
                }
            }
        }
        // try to find enabled component in "delta" direction
        int initialIndex = index;
        while (true) {
            int newIndex = indexCycle(index, delta);
            if (newIndex == initialIndex) {
                break;
            }
            index = newIndex;
            //
            Component component = m_Components[newIndex];
            if (component.isEnabled() && component.isVisible() && component.isFocusable()) {
                return component;
            }
        }
        // not found
        return currentComponent;
    }
    ////////////////////////////////////////////////////////////////////////////
    //
    // FocusTraversalPolicy
    //
    ////////////////////////////////////////////////////////////////////////////
    public Component getComponentAfter(Container container, Component component) {
        return cycle(component, 1);
    }
    public Component getComponentBefore(Container container, Component component) {
        return cycle(component, -1);
    }
    public Component getFirstComponent(Container container) {
        return m_Components[0];
    }
    public Component getLastComponent(Container container) {
        return m_Components[m_Components.length - 1];
    }
    public Component getDefaultComponent(Container container) {
        return getFirstComponent(container);
    }
}

重用使用WindowBuilderPro创建的可视类

2 个答案: