java 将 JFileChooser 置于所有窗口之上
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原文地址: http://stackoverflow.com/questions/5129294/
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Bringing JFileChooser on top of all windows
提问by Carlos
I seem to have a problem with my very simple implementation of a file chooser dialogue that requires me to minimize Netbeans each time in order to get to it, and it gets pretty frustrating specially now with testing.
我对文件选择器对话框的非常简单的实现似乎有问题，它需要我每次都最小化 Netbeans 才能访问它，而且现在测试变得非常令人沮丧。
I have seen a few solutions online including SOyet none seem to do the trick, while some other seem very lengthy and complicated for my current level.
我在网上看到了一些解决方案，包括SO但似乎没有一个解决方案，而其他一些解决方案对于我目前的水平来说似乎非常冗长和复杂。
private void fileSearch() {
JFileChooser fileSelect = new JFileChooser();
int returnVal = fileSelect.showOpenDialog(null);
String pathToFile;
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fileSelect.getSelectedFile();
pathToFile = file.getAbsolutePath();
try {
P.binaryFileToHexString(pathToFile);
} catch (Exception e) {
System.out.print("Oops! there was an error there..." + e);
}
System.out.println("\nYou chose to open this file: " + file.getName());
}
}
Some of my try's include using;
我的一些尝试包括使用；
.requestFocus();
.requestFocusInWindow();
.setVisible();
Is there a particular attribute/method I can set in order to solve the problem?
我可以设置特定的属性/方法来解决问题吗？
采纳答案by trashgod
The API for showOpenDialog()refers to showDialog(), which says, "If the parent is null, then the dialog depends on no visible window, and it's placed in a look-and-feel-dependent position such as the center of the screen."
的 APIshowOpenDialog()引用showDialog()，它说，“如果父是null，则对话框不依赖于可见窗口，并且它被放置在外观相关的位置，例如屏幕的中心。”
The example below positions the chooser in the center of the screen on my L&F. You might see how it compares to yours.
下面的示例将选择器定位在我的 L&F 屏幕中央。您可能会看到它与您的相比如何。
package gui;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.KeyStroke;
/**
* @see http://stackoverflow.com/questions/8507521
* @see http://stackoverflow.com/questions/5129294
*/
public class ImageApp extends JPanel {
private static final int MASK =
Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
private JFileChooser chooser = new JFileChooser();
private Action openAction = new ImageOpenAction("Open");
private Action clearAction = new ClearAction("Clear");
private JPopupMenu popup = new JPopupMenu();
private BufferedImage image;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new ImageApp().create();
}
});
}
public void create() {
JFrame f = new JFrame();
f.setTitle("Title");
f.add(new JScrollPane(this), BorderLayout.CENTER);
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("File");
menu.setMnemonic('F');
menu.add(new JMenuItem(openAction));
menu.add(new JMenuItem(clearAction));
menuBar.add(menu);
f.setJMenuBar(menuBar);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setSize(new Dimension(640, 480));
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public ImageApp() {
this.setComponentPopupMenu(popup);
popup.add("Popup Menu");
popup.add(new JMenuItem(openAction));
popup.add(new JMenuItem(clearAction));
}
@Override
public Dimension getPreferredSize() {
if (image == null) {
return new Dimension();
} else {
return new Dimension(image.getWidth(), image.getHeight());
}
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, null);
}
private class ClearAction extends AbstractAction {
public ClearAction(String name) {
super(name);
this.putValue(Action.MNEMONIC_KEY, KeyEvent.VK_C);
this.putValue(Action.ACCELERATOR_KEY,
KeyStroke.getKeyStroke(KeyEvent.VK_C, MASK));
}
@Override
public void actionPerformed(ActionEvent e) {
image = null;
revalidate();
repaint();
}
}
private class ImageOpenAction extends AbstractAction {
public ImageOpenAction(String name) {
super(name);
this.putValue(Action.MNEMONIC_KEY, KeyEvent.VK_O);
this.putValue(Action.ACCELERATOR_KEY,
KeyStroke.getKeyStroke(KeyEvent.VK_O, MASK));
}
@Override
public void actionPerformed(ActionEvent e) {
int returnVal = chooser.showOpenDialog(chooser);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File f = chooser.getSelectedFile();
try {
image = ImageIO.read(f);
revalidate();
repaint();
} catch (IOException ex) {
ex.printStackTrace(System.err);
}
}
}
}
}
回答by Yanick Rochon
I'm not sure what your problem actually is (it's probably your Netbeans.... who knows), but have you tried overriding the createDialogmethod?
我不确定您的问题究竟是什么（可能是您的 Netbeans .... 谁知道），但是您是否尝试过覆盖该createDialog方法？
Example:
例子：
JFileChooser fc = new JFileChooser() {
@Override
protected JDialog createDialog(Component parent) throws HeadlessException {
// intercept the dialog created by JFileChooser
JDialog dialog = super.createDialog(parent);
dialog.setModal(true); // set modality (or setModalityType)
return dialog;
}
};
This is merely a hack solution, you should not need to do that ordinarily.
这只是一个 hack 解决方案，您通常不需要这样做。
回答by Trasvi
fileSelect.showOpenDialog(this)
Of course, thismust be a Component of some sort (the JFrame or JPanel of your main interface).
All dialogs need to have a parent component if you wish them to come to the front.
当然，this必须是某种类型的组件（主界面的 JFrame 或 JPanel）。如果您希望它们出现在最前面，所有对话框都需要有一个父组件。
