JToolBar 中的 JSeperator 将组件移动到右端 [英] JSeperator in JToolBar moves the components to right end
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问题描述
我正在查看 Oracle 的 JToolBar code 并尝试在该工具栏中添加 JLabels.我通过覆盖鼠标事件为它们模拟了类似按钮的感觉.
I am looking at Oracle's JToolBar code and trying to add JLabels within that toolbar. I have simulated the button-like feel for them by overriding the mouse events.
它工作得很好，直到我尝试添加一个 JSeperator 因为我想要一条垂直线.我在 3 个 JLabels 之后添加了一个分隔符，导致其余的被移动到右端，如下所示.
It worked fine until I tried to add a JSeperator as I wanted a vertical line. I have added a separator after 3 JLabels causing the rest of them to get moved to the right end as shown below.
我尝试在 JSeparator 代码之前和之后添加 addSeparator() ，但仍然没有运气.
I have tried adding the addSeparator() just before and after the JSeparator code , but still no luck.
代码
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.File;
import java.io.FilenameFilter;
import javax.swing.BorderFactory;
import javax.swing.JLabel;
import javax.swing.JSeparator;
public class ToolBarDemo extends JPanel
implements ActionListener {
protected JTextArea textArea;
protected String newline = "\n";
static final private String PREVIOUS = "previous";
static final private String UP = "up";
static final private String NEXT = "next";
public ToolBarDemo() {
super(new BorderLayout());
//Create the toolbar.
final JToolBar toolBar = new JToolBar("Still draggable");
toolBar.setBorderPainted(true);
//Getting only files whose name ending with '_24px.png'
File dir = new File("G:\\MyImagesFolder");
File[] files = dir.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.endsWith("_24px.png");
}
});
int count = 0;
for (File pngFile : files) {
// Trying to add 'JSeperator' after third 'JLabel'
if (count == 3) {
toolBar.addSeparator();
JSeparator separator = new JSeparator();
separator.setOrientation(JSeparator.VERTICAL);
toolBar.add(separator);
toolBar.addSeparator();
}
count++;
System.out.println(pngFile.toString());
toolBar.add(getToolBarIcon(pngFile.toString()));
}
//Create the text area used for output. Request
//enough space for 5 rows and 30 columns.
textArea = new JTextArea(5, 30);
textArea.setEditable(true);
JScrollPane scrollPane = new JScrollPane(textArea);
//Lay out the main panel.
setPreferredSize(new Dimension(450, 130));
add(toolBar, BorderLayout.PAGE_START);
add(scrollPane, BorderLayout.CENTER);
JButton b = new JButton("OK");
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (toolBar.isVisible()) {
toolBar.setVisible(false);
} else {
toolBar.setVisible(true);
}
}
});
add(b, BorderLayout.PAGE_END);
}
public JLabel getToolBarIcon(String fileName) {
final JLabel lblToolBarIcon = new JLabel(new ImageIcon(fileName));
lblToolBarIcon.setToolTipText(fileName);
lblToolBarIcon.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
lblToolBarIcon.addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
System.out.println("pressed");
lblToolBarIcon.setBorder(BorderFactory.createLoweredSoftBevelBorder());
}
@Override
public void mouseReleased(MouseEvent e) {
System.out.println("released");
lblToolBarIcon.setBorder(BorderFactory.createRaisedSoftBevelBorder());
}
@Override
public void mouseEntered(MouseEvent e) {
System.out.println("enter");
lblToolBarIcon.setBorder(BorderFactory.createRaisedSoftBevelBorder());
}
@Override
public void mouseExited(MouseEvent e) {
System.out.println("exit");
lblToolBarIcon.setBorder(BorderFactory.createEmptyBorder(3, 3, 3, 3));
}
});
return lblToolBarIcon;
}
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
String description = null;
// Handle each button.
if (PREVIOUS.equals(cmd)) { //first button clicked
description = "taken you to the previous <something>.";
} else if (UP.equals(cmd)) { // second button clicked
description = "taken you up one level to <something>.";
} else if (NEXT.equals(cmd)) { // third button clicked
description = "taken you to the next <something>.";
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event dispatch thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("ToolBarDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Add content to the window.
frame.add(new ToolBarDemo());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
//Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
}
我应该如何克服这个问题?我的错误是什么?
How should I overcome this ? What is my mistake here ?
推荐答案
明确指定 JSeparator 的维度，以便 LayoutManager 了解 LayoutManager 上的任何尺寸限制代码>组件.例如，您可以通过覆盖 getMaximumSize 方法来定义 JSeparator 的最大大小:
Specify the Dimensions of the JSeparator explicitly so the LayoutManager is aware of any size constraints on the Component. For instance you can define the JSeparator's maximum size by overriding the getMaximumSize method:
JSeparator separator = new JSeparator(){
@Override
public Dimension getMaximumSize(){
return new Dimension(5, 25);
}
};
separator.setOrientation(JSeparator.VERTICAL);
toolBar.add(separator);
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