java - 在文件选择器中更改附件组件的位置

Question

我在更改文件选择器中附件组件的位置时遇到问题。

我通过在文件选择器的附件组件中放置一个复选框来自定​​义保存文件对话框。但是复选框的位置不好，真的很难看。

我可以将附件组件移动到文件 Pane 下方吗？怎么做？

或者，如果您有其他解决方案来做同样的事情，也欢迎。

谢谢你们。

我使用以下代码添加复选框:

JFileChooser fc = new JFileChooser(file)
JPanel accessory = new JPanel();
JCheckBox isOpenBox = new JCheckBox("Open file after saving");
accessory.setLayout(new BorderLayout());
accessory.add(isOpenBox, BorderLayout.SOUTH);
fc.setAccessory(accessory);

在这个截图中，复选框的位置不好。



这个截图正是我想要的效果。

Answer 1

“正确”的方法是构建一个满足您要求的新 UI/外观委托(delegate)。问题是，您需要执行此操作的细节(以 OO 方式)被隐藏了，private没有公共(public)/ protected 访问器或在本地定义...这是大多数 L&F 代表的主要问题...谢谢大家...

所以，你最终会复制和粘贴整个类(class)，这样你就可以添加这个功能......你需要为你想要支持的每个平台都这样做......

“不太理想”的方法是在 JFileChooser 内搜索。并提取您需要“改造”您的要求的那些元素。这很困惑，很容易出错，它会做出假设并且会非常非常容易地崩溃。

就个人而言，如果我要走这条特定的轨道，我会创建一个实用程序类，它提供一个简单的 public , static允许我传递 JFileChooser 实例的方法并拥有它，基于当前平台(和/或当前外观和感觉)，为我进行更改...或可以自动生成 JFileChooser 的工厂类修改以满足这些要求...但这只是一个想法...

让我重申一下，这对于一个非常糟糕的设计问题来说是一个非常糟糕的主意，并且旨在证明: 1- 尝试修改外观的问题； 2-您在尝试按照希望的方式进行这项工作时将面临的问题和问题......

import java.awt.Component;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFileChooser fc = new JFileChooser();
                List<JTextField> fields = findAll(JTextField.class, fc);
                if (fields.size() == 1) {
                    JTextField fieldNameField = fields.get(0);
                    Container parent = fieldNameField.getParent();
                    JCheckBox cb = new JCheckBox("Open file after saving");

                    JComboBox fileTypes = findAll(JComboBox.class, parent).get(0);

                    parent.setLayout(new GridBagLayout());
                    parent.removeAll();
                    GridBagConstraints gbc = new GridBagConstraints();
                    gbc.gridx = 0;
                    gbc.gridy = 0;
                    gbc.fill = GridBagConstraints.HORIZONTAL;
                    gbc.weightx = 1;
                    gbc.insets = new Insets(2, 2, 4, 2);

                    parent.add(fieldNameField, gbc); // file name field...

                    gbc.gridx++;
                    gbc.weightx = 0;
                    parent.add(cb, gbc); // Check box

                    gbc.gridx = 0;
                    gbc.gridy++;
                    gbc.gridwidth = GridBagConstraints.REMAINDER;
                    parent.add(fileTypes, gbc); // File types

                } else {
                    System.out.println("Found to many results?!");
                }

                fc.showOpenDialog(null);
            }
        });
    }

    public <T extends Component> List<T> findAll(Class<? extends T> aClass, Container parent) {
        List<T> matches = new ArrayList<>();

        for (Component child : parent.getComponents()) {
            if (aClass.isInstance(child)) {
                matches.add((T)child);
            }
            if (child instanceof Container) {
                matches.addAll(findAll(aClass, (Container)child));
            }
        }

        return matches;
    }

}

不，我并不骄傲……需要用漂白剂洗我的眼睛和大脑……恶心……

更新了 Mac 支持

对于那些想要 Mac 版本的人...



这只是进一步突出了这种方法的“脆弱性”，打破它并不需要太多......

import java.awt.Component;
import java.awt.Container;
import java.awt.EventQueue;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JCheckBox;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFileChooser fc = new JFileChooser();
                List<JLabel> labels = findAll(JLabel.class, fc);

                JCheckBox cb = new JCheckBox("Open file after saving");
                JLabel fileFormatLabel = null;
                for (JLabel label : labels) {
                    if ("File Format:".equals(label.getText())) {
                        fileFormatLabel = label;
                    }
                }
                System.out.println(fileFormatLabel);
                if (fileFormatLabel != null) {
                    Container parent = fileFormatLabel.getParent();
                    parent.add(cb);
                }

                fc.showOpenDialog(null);
            }
        });
    }

    public <T extends Component> List<T> findAll(Class<? extends T> aClass, Container parent) {
        List<T> matches = new ArrayList<>();

        for (Component child : parent.getComponents()) {
            if (aClass.isInstance(child)) {
                matches.add((T) child);
            }
            if (child instanceof Container) {
                matches.addAll(findAll(aClass, (Container) child));
            }
        }

        return matches;
    }

}

更新为 Locale基于搜索

这使用 FileChooser.filesOfTypeLabelText UIManager.getString查找 File Format: 的文本关键，理论上，应该使它成为一个(稍微)更好的跨平台解决方案......至少它使它在mac上更好地工作......

这也证明了必须开始支持多个操作系统的困惑......因为我只有两个......

import java.awt.Component;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test1 {

    public static void main(String[] args) {
        new Test1();
    }

    public Test1() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFileChooser fc = new JFileChooser();        
                JCheckBox cb = new JCheckBox("Open file after saving");

                if (System.getProperty("os.name").startsWith("Windows 7")) {
                    List<JTextField> fields = findAll(JTextField.class, fc);
                    if (fields.size() == 1) {
                        JTextField fieldNameField = fields.get(0);
                        Container parent = fieldNameField.getParent();
                        JComboBox fileTypes = findAll(JComboBox.class, parent).get(0);

                        parent.setLayout(new GridBagLayout());
                        parent.removeAll();
                        GridBagConstraints gbc = new GridBagConstraints();
                        gbc.gridx = 0;
                        gbc.gridy = 0;
                        gbc.fill = GridBagConstraints.HORIZONTAL;
                        gbc.weightx = 1;
                        gbc.insets = new Insets(2, 2, 4, 2);

                        parent.add(fieldNameField, gbc); // file name field...

                        gbc.gridx++;
                        gbc.weightx = 0;
                        parent.add(cb, gbc); // Check box

                        gbc.gridx = 0;
                        gbc.gridy++;
                        gbc.gridwidth = GridBagConstraints.REMAINDER;
                        parent.add(fileTypes, gbc); // File types                        

                    }

                } else if (System.getProperty("os.name").startsWith("Mac OS X")) {

                    Locale l = fc.getLocale();
                    JLabel fileFormatLabel = findLabelByText(fc, UIManager.getString("FileChooser.filesOfTypeLabelText", l), "Format:");

                    if (fileFormatLabel != null) {
                        Container parent = fileFormatLabel.getParent();
                        System.out.println("");

                        parent.add(cb);
                    }

                }

                fc.showOpenDialog(null);
            }
        });
    }

    public JLabel findLabelByText(Container parent, String... texts) {
        JLabel find = null;
        List<JLabel> labels = findAll(JLabel.class, parent);
        for (JLabel label : labels) {
            for (String text : texts) {
                if (text.equals(label.getText())) {
                    find = label;
                    break;
                }
            }
        }
        return find;
    }

    public <T extends Component> List<T> findAll(Class<? extends T> aClass, Container parent) {
        List<T> matches = new ArrayList<>();

        for (Component child : parent.getComponents()) {
            if (aClass.isInstance(child)) {
                matches.add((T) child);
            }
            if (child instanceof Container) {
                matches.addAll(findAll(aClass, (Container) child));
            }
        }

        return matches;
    }

}

用反射更新...

由于我已经为以前的“黑客”而去程序员 hell ，我不妨举一个使用反射来查找字段的示例。

现在，您可以通过多种方式执行此操作，例如，您可以按类型列出所有字段，并检查各种属性以确定您想要什么。这将在您不知道实际字段名称时使用，或者，如果您可以访问源代码，则可以直接查找字段名称，如本示例中所做的那样

import java.awt.Component;
import java.awt.Container;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFileChooser;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.plaf.FileChooserUI;

public class Test1 {

    public static void main(String[] args) {
        new Test1();
    }

    public Test1() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFileChooser fc = new JFileChooser();
                JCheckBox cb = new JCheckBox("Open file after saving");

                if (System.getProperty("os.name").startsWith("Windows 7")) {

                    try {
                        JTextField filenameTextField = (JTextField) getField("filenameTextField", fc.getUI());
                        JComboBox filterComboBox = (JComboBox) getField("filterComboBox", fc.getUI());

                        System.out.println(filenameTextField);
                        System.out.println(filterComboBox);

                        Container parent = filenameTextField.getParent();

                        parent.setLayout(new GridBagLayout());
                        parent.removeAll();
                        GridBagConstraints gbc = new GridBagConstraints();
                        gbc.gridx = 0;
                        gbc.gridy = 0;
                        gbc.fill = GridBagConstraints.HORIZONTAL;
                        gbc.weightx = 1;
                        gbc.insets = new Insets(2, 2, 4, 2);

                        parent.add(filenameTextField, gbc); // file name field...

                        gbc.gridx++;
                        gbc.weightx = 0;
                        parent.add(cb, gbc); // Check box

                        gbc.gridx = 0;
                        gbc.gridy++;
                        gbc.gridwidth = GridBagConstraints.REMAINDER;
                        parent.add(filterComboBox, gbc); // File types                        
                    } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException ex) {
                        ex.printStackTrace();
                    }
                } else if (System.getProperty("os.name").startsWith("Mac OS X")) {

                    try {
                        JComboBox filterComboBox = (JComboBox) getField("filterComboBox", fc.getUI());
                        Container parent = filterComboBox.getParent();
                        parent.add(cb);
                    } catch (NoSuchFieldException | IllegalArgumentException | IllegalAccessException ex) {
                        ex.printStackTrace();
                    }
                }

                fc.showOpenDialog(null);
            }

        });
    }

    private Object getField(String name, Object parent) throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
        Class aClass = parent.getClass();
        Field field = aClass.getDeclaredField(name);
        field.setAccessible(true);
        return field.get(parent);
    }

}

记住:仅仅因为您可以做某事，并不意味着您应该做某事!