我写了一个程序来创建一个框架，该框架将显示控制面板和可视面板，但是控制面板中的按钮占用了太多空间。因此，任何机构都知道如何解决它？给出的是代码。
import java.awt.*;
import java.awt.event.KeyEvent;
import javax.swing.*;
/**
* This class generates and displays a visualization of a Sierpinski
*
*/
public class tOpost
{
private JFrame window;
private JTextField depthTextField;
private Canvas visual;
// declare and initialize default values
private int canvasSize = 512;
/**
* Creates a new window and displays a visualization of a Mandelbrot set
*/
public tOpost()
{
// create new window
window = new JFrame("Sierpinski Visulaizer");
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new FlowLayout(FlowLayout.LEFT));
// create main panel
JPanel mainPanel = new JPanel(new GridLayout(0,1));
// create textfields with labels
JPanel depthField = new JPanel(new FlowLayout());
depthField.add(new JLabel("Recursive Depth: "));
depthTextField = new JTextField("");
depthTextField.setPreferredSize(new Dimension(80,25));
depthField.add(depthTextField);
// create comboBoxes
JPanel panel2 = new JPanel();
String[] colorText= {"Blue", "Green"};
panel2.setLayout(new BoxLayout(panel2, BoxLayout.Y_AXIS));
JPanel[] jPanels = new JPanel[5];
for (int i = 0; i<5; i++) {
JPanel depthColorPanel = new JPanel();
depthColorPanel.add(new JLabel("Color " + (i + 1) + ": "));
JComboBox comboBox = new JComboBox(colorText);
comboBox.setSelectedItem("Blue");
depthColorPanel.add(comboBox);
jPanels[i] = depthColorPanel;
}
JPanel randomColorPanel = new JPanel();
JCheckBox randomColorButton = new JCheckBox("Randomize color at each level");
randomColorButton.setMnemonic(KeyEvent.VK_G);
randomColorButton.setSelected(false);
randomColorPanel.add(randomColorButton);
// create panel for controls
panel2.add(depthField);
for (JPanel panel : jPanels) {
panel2.add(panel);
}
panel2.add(randomColorPanel);
// create button
JPanel germinatePanel = new JPanel(new FlowLayout());
JButton germinateButton = new JButton("Draw");
germinatePanel.add(germinateButton);
mainPanel.add(panel2);
mainPanel.add(germinatePanel);
// create canvas for visualization
visual = new Canvas();
visual.setBackground(Color.BLACK);
visual.setPreferredSize(new Dimension(canvasSize, canvasSize));
mainPanel.setMinimumSize(new Dimension(100, 100));
mainPanel.setPreferredSize(new Dimension(250,canvasSize));
mainPanel.setLocation(750, 250);
// pack widgets and display window
window.add(visual);
window.add(mainPanel);
window.pack();
window.setVisible(true);
System.out.println(mainPanel.getSize().getHeight()+","+ mainPanel.getSize().getWidth());
}
/**
* Draws Triangle.
*
* @param x
* @param y
* @param s
* @param color
*/
/**
* Starts the program by creating a new instance of the Triangle class.
*/
public static void main(String[] args)
{
new tOpost();
}
}
最佳答案
请勿将AWT Components与Swing JComponents混合，因为这是可能的，但仍然会引起一些问题
不要为mainPanel.setSize(100,100);声明，让此为正确的LayoutManager工作JPanel depthField = new JPanel(new FlowLayout());，FlowLayout接受来自JComponents的PreferredSizepanel2.setLayout(new BoxLayout(panel2, BoxLayout.Y_AXIS)); BoxLayout接受返回JComponents的PreferredSize
JPanel默认情况下实现了FlowLayout（没有LayoutManager的任何定义）
您必须覆盖Painting in the standard Java GUI的正确方法
对于AWT组件，请使用方法paint()
对于Swing JComponents，使用方法paintComponent()
。
。
编辑
。
。
此代码将帮助您解决JComboBox
码
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ComboBoxEditor;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.border.LineBorder;
import javax.swing.event.EventListenerList;
class ColorComboBoxEditor implements ComboBoxEditor {
final protected JButton editor;
private EventListenerList listenerList = new EventListenerList();
ColorComboBoxEditor(Color initialColor) {
editor = new JButton("");
editor.setBackground(initialColor);
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Color currentBackground = editor.getBackground();
Color color = JColorChooser.showDialog(editor, "Color Chooser", currentBackground);
if ((color != null) && (currentBackground != color)) {
editor.setBackground(color);
fireActionEvent(color);
}
}
};
editor.addActionListener(actionListener);
}
@Override
public void addActionListener(ActionListener l) {
listenerList.add(ActionListener.class, l);
}
@Override
public Component getEditorComponent() {
return editor;
}
@Override
public Object getItem() {
return editor.getBackground();
}
@Override
public void removeActionListener(ActionListener l) {
listenerList.remove(ActionListener.class, l);
}
@Override
public void selectAll() {
}
@Override
public void setItem(Object newValue) {
if (newValue instanceof Color) {
Color color = (Color) newValue;
editor.setBackground(color);
} else {
try {
Color color = Color.decode(newValue.toString());
editor.setBackground(color);
} catch (NumberFormatException e) {
}
}
}
protected void fireActionEvent(Color color) {
Object listeners[] = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2) {
if (listeners[i] == ActionListener.class) {
ActionEvent actionEvent = new ActionEvent(editor, ActionEvent.ACTION_PERFORMED, color.toString());
((ActionListener) listeners[i + 1]).actionPerformed(actionEvent);
}
}
}
}
class ColorCellRenderer implements ListCellRenderer {
private DefaultListCellRenderer defaultRenderer = new DefaultListCellRenderer();
private final static Dimension preferredSize = new Dimension(0, 20);
@Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
JLabel renderer = (JLabel) defaultRenderer.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (value instanceof Color) {
renderer.setBackground((Color) value);
}
if (cellHasFocus || isSelected) {
renderer.setBorder(new LineBorder(Color.DARK_GRAY));
} else {
renderer.setBorder(null);
}
renderer.setPreferredSize(preferredSize);
return renderer;
}
}
class ColorComboBoxEditorRendererDemo {
public ColorComboBoxEditorRendererDemo() {
Color colors[] = {Color.BLACK, Color.BLUE, Color.GREEN, Color.RED, Color.WHITE, Color.YELLOW};
JFrame frame = new JFrame("Color JComboBox");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JComboBox comboBox = new JComboBox(colors);
comboBox.setEditable(true);
comboBox.setRenderer(new ColorCellRenderer());
Color color = (Color) comboBox.getSelectedItem();
ComboBoxEditor editor = new ColorComboBoxEditor(color);
comboBox.setEditor(editor);
frame.add(comboBox, BorderLayout.NORTH);
final JLabel label = new JLabel();
label.setOpaque(true);
label.setBackground((Color) comboBox.getSelectedItem());
frame.add(label, BorderLayout.CENTER);
ActionListener actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent actionEvent) {
Color selectedColor = (Color) comboBox.getSelectedItem();
label.setBackground(selectedColor);
}
};
comboBox.addActionListener(actionListener);
frame.setSize(300, 200);
frame.setVisible(true);
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
ColorComboBoxEditorRendererDemo colorComboBoxEditorRendererDemo = new ColorComboBoxEditorRendererDemo();
}
});
}
}