我正在创建同时需要相对和绝对定位的GUI。我需要绝对定位（我相信），因为显示的元素是动态变化的，并且我不希望GUI一直调整大小。
注意：我正在尝试创建一个4行的网格，每行5个复选框。
这是代码。
final int MAXNUMBEROFLABELSPERROW = 5;
final int defaultCheckBoxWidth = 60;
final int defaultCheckBoxHeigth = 60;
JLabel bigBlindRemoveLabel = new JLabel("Remove big blind numbers", SwingConstants.CENTER);
JPanel buttonsPanel = new JPanel();
buttonsPanel.setLayout(new BorderLayout());
JPanel buttonsSubPanel = new JPanel();
buttonsSubPanel.setLayout(new BorderLayout());
removeButton = new JButton("Remove");
removeButton.addActionListener(this);
removeAllButton = new JButton("Remove All");
removeAllButton.addActionListener(this);
buttonsSubPanel.add(removeButton, BorderLayout.NORTH);
buttonsSubPanel.add(removeAllButton, BorderLayout.SOUTH);
buttonsPanel.add(buttonsSubPanel, BorderLayout.CENTER);
buttonsPanel.setBorder(new EmptyBorder(50, 20, 50, 20));
JPanel checkboxesSubPanel = new JPanel();
checkboxesSubPanel.setLayout(null);
// Create 20 check boxes and fill the list field with big blind numbers
for (int index = 0; index <= TOTALNUMBEROFCHECKBOXES - 1; index++)
{
numberCheckBoxes[index] = new JCheckBox();
numberCheckBoxes[index].setSize(defaultCheckBoxWidth, defaultCheckBoxHeigth);
numberCheckBoxes[index].setSelected(false);
numberCheckBoxes[index].setLocation(
defaultCheckBoxWidth * (index % MAXNUMBEROFLABELSPERROW) + 10,
(index / MAXNUMBEROFLABELSPERROW) * defaultCheckBoxHeigth + defaultCheckBoxHeigth);
numberCheckBoxes[index].setVisible(false);
checkboxesSubPanel.add(numberCheckBoxes[index]);
}
checkboxesSubPanel.setSize(
numberCheckBoxes[TOTALNUMBEROFCHECKBOXES - 1].getX()
+ numberCheckBoxes[TOTALNUMBEROFCHECKBOXES - 1].getWidth() + 20,
numberCheckBoxes[TOTALNUMBEROFCHECKBOXES - 1].getY()
+ numberCheckBoxes[TOTALNUMBEROFCHECKBOXES - 1].getHeight() + 20);
resultsPanel.add(bigBlindRemoveLabel, BorderLayout.NORTH);
resultsPanel.add(checkboxesSubPanel, BorderLayout.WEST);
resultsPanel.add(buttonsPanel, BorderLayout.EAST);
JFrame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setContentPane(resultsPanel);
frame.setVisible(true);
frame.pack();
我要寻找的东西（绝对定位的东西都做了，我正在努力改善）
我在上面发布的代码中看到了什么
我的问题是显示了该部分，但是如果我更改复选框文本（我想避免这样做），它的大小会动态变化。另外，我不确定为什么所有复选框都显示在一行上（我之前使用相同的代码进行绝对定位是没有问题的）。提前致谢！
最佳答案
我需要绝对定位（我相信），因为显示的元素是动态变化的，并且我不希望GUI一直调整大小。
我想你看不到森林的树木。请记住，您不会只使用一个布局管理器，而是可以使用复合容器/布局来实现一些非常复杂的布局。
您还可以使用布局管理器的功能EmptyBorder，对于按钮，可以使用边距来调整控件的大小和间距。
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Collections;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.Scrollable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.MatteBorder;
public class TestLayout {
public static void main(String[] args) {
new TestLayout();
}
public TestLayout() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 0, 4, 0);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.WEST;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
add(new JLabel("Big binds of first level: 25/50", JLabel.CENTER), gbc);
gbc.gridx = 0;
gbc.gridy++;
gbc.gridwidth = 1;
gbc.anchor = GridBagConstraints.CENTER;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
SelectionPane selectionPane = new SelectionPane();
selectionPane.setBorder(new MatteBorder(1, 0, 0, 0, Color.BLACK));
add(selectionPane, gbc);
gbc.gridx++;
FilterPane filterPane = new FilterPane();
filterPane.setBorder(new MatteBorder(1, 1, 0, 0, Color.BLACK));
add(filterPane, gbc);
selectionPane.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
filterPane.setOptions(selectionPane.getSelectedValues());
}
});
}
}
protected class SelectionPane extends JPanel {
private JList<Integer> listValues;
private DefaultListModel<Integer> listModel;
public SelectionPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.WEST;
gbc.weightx = 1;
add(new JLabel("Add bind numbers to queries"), gbc);
gbc.weighty = 1;
gbc.gridx = 0;
gbc.gridy++;
gbc.gridwidth = 1;
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.BOTH;
listModel = new DefaultListModel();
for (int index = 0; index < 100; index++) {
listModel.addElement(index);
}
listValues = new JList(listModel);
add(new JScrollPane(listValues), gbc);
gbc.weighty = 0;
gbc.weightx = 0;
gbc.anchor = GridBagConstraints.NORTH;
gbc.gridx++;
gbc.fill = GridBagConstraints.NONE;
gbc.ipadx = 10;
gbc.ipady = 10;
JButton add = new JButton("Add");
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
fireActionPerformed();
}
});
add(add, gbc);
}
public List<Integer> getSelectedValues() {
return Collections.unmodifiableList(listValues.getSelectedValuesList());
}
public void addActionListener(ActionListener listener) {
listenerList.add(ActionListener.class, listener);
}
public void removeActionListener(ActionListener listener) {
listenerList.remove(ActionListener.class, listener);
}
protected void fireActionPerformed() {
ActionListener[] listeners = listenerList.getListeners(ActionListener.class);
if (listeners.length > 0) {
ActionEvent evt = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "Selection.add");
for (ActionListener listener : listeners) {
listener.actionPerformed(evt);
}
}
}
}
protected class FilterPane extends JPanel {
private OptionsPane optionsPane;
public FilterPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(4, 4, 4, 4);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.WEST;
gbc.weightx = 1;
add(new JLabel("Remove big blind numbers"), gbc);
gbc.weighty = 1;
gbc.gridx = 0;
gbc.gridy++;
gbc.gridwidth = 1;
gbc.gridheight = GridBagConstraints.REMAINDER;
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.BOTH;
optionsPane = new OptionsPane();
add(new JScrollPane(optionsPane), gbc);
gbc.weighty = 0;
gbc.gridheight = 1;
gbc.weightx = 0;
gbc.anchor = GridBagConstraints.NORTH;
gbc.gridx++;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.ipadx = 10;
gbc.ipady = 10;
JButton remove = new JButton("Remove");
add(remove, gbc);
gbc.gridy++;
JButton removeAll = new JButton("Remove All");
add(removeAll, gbc);
}
public void setOptions(List<Integer> options) {
optionsPane.setOptions(options);
}
protected class OptionsPane extends JPanel implements Scrollable {
public OptionsPane() {
setLayout(new GridBagLayout());
}
public void setOptions(List<Integer> options) {
removeAll();
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.WEST;
for (Integer option : options) {
JCheckBox cb = new JCheckBox(option.toString());
add(cb, gbc);
gbc.gridx++;
if (gbc.gridx % 5 == 0) {
gbc.gridx = 0;
gbc.gridy++;
}
}
gbc.gridx = 0;
gbc.gridy++;
gbc.weighty = 1;
add(new JLabel(), gbc);
revalidate();
repaint();
}
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(210, 100);
}
@Override
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
return 64;
}
@Override
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
return 64;
}
@Override
public boolean getScrollableTracksViewportWidth() {
return getPreferredSize().width
<= getParent().getSize().width;
}
@Override
public boolean getScrollableTracksViewportHeight() {
return getPreferredSize().height
<= getParent().getSize().height;
}
}
}
}
关于java - Swing的相对和绝对定位问题，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33946629/