java – 在文件选择器中更改附件组件的位置
作者：互联网
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窗格下面吗？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.
感谢大伙们.
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);
在此屏幕截图中,复选框的位置不佳.
这个截图是我想要的确切效果.
解决方法:
“正确”的方式是构建一个符合您要求的新UI /外观代理.问题是,您需要执行此操作的详细信息(以OO方式)是隐藏的,要么是私有的,没有公共/受保护的访问者,要么是本地定义的……这是大多数L& F代表的主要问题……多谢你们…
所以,你最终会复制并粘贴整个课程,这样你就可以添加这个功能……你需要为你想支持的每个平台做这个…
“不太理想”的方式是在JFileChooser中徘徊,并拉出你需要“改造”你的要求的那些元素.这很麻烦,它容易出错,它会做出假设并且会很容易地破坏.
就个人而言,如果我要沿着这个特定的轨道走下去,我会创建一个实用程序类,它提供了一个简单的公共静态方法,它允许我传递一个JFileChooser实例,并根据当前平台(和/或当前的外观和感觉),为我做出改变…或者工厂类可以自动生成一个JFileChooser,修改后可以满足这些要求……但这只是一个想法……
让我重复一遍,对于一个非常糟糕的设计问题,这是一个非常糟糕的想法,并且旨在证明：1-试图修改外观和感觉的问题; 2-试图按照这种方式进行工作所面临的问题和问题……
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,我不自豪……需要用漂白剂去洗眼睛和大脑…… icky ……
更新了Mac支持
而对于那些想要Mac版本的人来说……
这进一步凸显了这种方法的“片状”,打破它不会花费太多时间……
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;
}
}
更新了基于区域设置的搜索
这使用FileChooser.filesOfTypeLabelText UIManager.getString来查找文件格式：键的文本,理论上应该使它成为一个(略微)更好的跨平台解决方案……至少它使它在mac上工作得更好. ..
这也说明了必须开始支持多个操作系统的混乱…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;
}
}
更新了反射……
由于我已经为以前的“黑客”打算使用程序员地狱,我不妨投入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的内容.当您不知道实际的字段名称时,将使用此名称.如果您有权访问源代码,则可以直接查找字段名称,如本示例中所示
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：只因为你可以做某事,并不代表你应该做的事！
标签：jfilechooser,jcheckbox,custom-component,java,swing 来源： https://codeday.me/bug/20191001/1839340.html