如何在Java中创建带有连接按钮的ButtonGroup？ [英] How to create a ButtonGroup with connected buttons in Java?
问题描述
我目前正在尝试创建一组切换按钮，这些按钮类似于Eclipse格式化程序首选项中使用的切换按钮：
目前我已通过以下方式尝试此操作：
公共类练习扩展JFrame {
private String [] buttonNames = {A，B ，C，D，E};
练习（）{
final JPanel topPanel = new JPanel（）;
topPanel.setLayout（new GridBagLayout（））;
GridBagConstraints c = new GridBagConstraints（）;
int tabCount = 0;
final ButtonGroup topButtonGroup = new ButtonGroup（）;
for（String buttonName：buttonNames）{
JToggleButton tabButton = new JToggleButton（buttonName）;
topButtonGroup.add（tabButton）;
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets（0，-6,0，-7）; //可疑行
c.gridx = tabCount;
c.gridy = 0;
topPanel.add（tabButton，c）;
tabCount ++;
}
this.add（topPanel）;
this.setVisible（true）;
this.pack（）;
}
public static void main（String [] args）{
new Exercise（）;
}
}
结果如下：
我的代码有几个问题。首先，我不明白为什么我必须让插图消极。根据的外观和感觉以及JTabbedPane，我几乎得到了正是我想要的：
然后我意识到JTabbedPane的默认外观正是我想要的：
< img src =https://i.stack.imgur.com/ceunb.pngalt =默认外观>
我使用的代码类似Oracle的 JTabbedPane教程中使用的内容： p>
public class SeaGlassExercise {
public static void initWindow（）{
JFrame frame = new JFrame （应用名称）;
CustomTabbedPane content = new CustomTabbedPane（）;
frame.setContentPane（content）;
frame.setDefaultCloseOperation（JFrame.DISPOSE_ON_CLOSE）;
frame.setLocationByPlatform（true）;
//试试{
// UIManager.setLookAndFeel（
//com.seaglasslookandfeel.SeaGlassLookAndFeel）;
//} catch（例外e）{
// e.printStackTrace（）;
//}
// SwingUtilities.updateComponentTreeUI（frame）;
frame.pack（）;
frame.setVisible（true）;
}
public static void main（String [] args）{
SwingUtilities.invokeLater（new Runnable（）{
@Override
public void run （）{
initWindow（）;
}
}）;
}
}
class CustomTabbedPane扩展JPanel {
public CustomTabbedPane（）{
super（new GridLayout（1） ，1））;
JTabbedPane tabbedPane = new JTabbedPane（）;
JComponent panel1 = makeTextPanel（Panel＃1）;
tabbedPane.addTab（AAA，panel1）;
JComponent panel2 = makeTextPanel（Panel＃2）;
tabbedPane.addTab（BBB，panel2）;
JComponent panel3 = makeTextPanel（Panel＃3）;
tabbedPane.addTab（CCC，panel3）;
JComponent panel4 = makeTextPanel（Panel＃4）;
tabbedPane.addTab（DDD，panel4）;
add（tabbedPane）;
tabbedPane.setTabLayoutPolicy（JTabbedPane.SCROLL_TAB_LAYOUT）;
}
protected JComponent makeTextPanel（String text）{
JPanel panel = new JPanel（）;
JLabel filler = new JLabel（text）;
filler.setHorizontalAlignment（JLabel.CENTER）;
panel.setLayout（new GridLayout（1,1））;
panel.add（填充）;
返回面板;
}
}
虽然我知道Java Swing的默认平台依赖性外观我觉得JTabbedPane看起来与教程中显示的有很大不同：
I am currently trying to create a group of toggle-buttons that are similar to the one's used in the formatter preferences of Eclipse:
Currently I have attempted this in the following way:
public class Exercise extends JFrame {
private String[] buttonNames = {"A", "B", "C", "D", "E"};
Exercise() {
final JPanel topPanel = new JPanel();
topPanel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
int tabCount = 0;
final ButtonGroup topButtonGroup = new ButtonGroup();
for (String buttonName : buttonNames) {
JToggleButton tabButton = new JToggleButton(buttonName);
topButtonGroup.add(tabButton);
c.fill = GridBagConstraints.HORIZONTAL;
c.insets = new Insets(0, -6, 0, -7); // Questionable line
c.gridx = tabCount;
c.gridy = 0;
topPanel.add(tabButton, c);
tabCount++;
}
this.add(topPanel);
this.setVisible(true);
this.pack();
}
public static void main(String[] args) {
new Exercise();
}
}
The result is as follows:
I have a couple of concerns with my code. First, I do not understand why I have to make the insets negative. According to Oracle's tutorial, "[b]y default, each component has no external padding." Hence, shouldn't there be no spaces by default? Without the negative insets, the result looks like follows:
Second, I would like to have the toggle button darken instead of turn blue with toggled "on". Is there any easy way do this through Java Swing? Finally, is there any better approach in general? I am curious to know how Eclipse managed to get the toggle-buttons to look as if they are perfectly connected.
Update
I have tried using a BoxLayout as recommended. Unfortunately, this did not seem to fix the problem. The result is almost identical to the picture above. Here is the modified constructor:
Exercise() {
final JPanel topPanel = new JPanel();
topPanel.setLayout(new BoxLayout(topPanel, BoxLayout.X_AXIS));
final ButtonGroup topButtonGroup = new ButtonGroup();
for (String buttonName : buttonNames) {
JToggleButton tabButton = new JToggleButton(buttonName);
// tabButton.setBorder(BorderFactory.createBevelBorder(
// BevelBorder.RAISED, Color.LIGHT_GRAY, Color.DARK_GRAY));
topButtonGroup.add(tabButton);
topPanel.add(tabButton);
}
this.add(topPanel);
this.setVisible(true);
this.pack();
}
Interestingly enough when I tried adding a border as commented out above, the extra spacing between the buttons somehow disappeared. The result is as below:
As much as possible I would like to keep the general look of the button as before but have the edges be more rectangular so that the toggle-buttons will look more connected.
It seems that I have made an embarrassing mistake. I tried dic19's suggestion of using Seaglass' look and feel together with a JTabbedPane and I got almost exactly what I wanted:
But then I realised that the default look and feel for the JTabbedPane was exactly what I wanted:
The code I used is similar to that used in the JTabbedPane tutorial by Oracle:
public class SeaGlassExercise {
public static void initWindow() {
JFrame frame = new JFrame("Application Name");
CustomTabbedPane content = new CustomTabbedPane();
frame.setContentPane(content);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLocationByPlatform(true);
// try {
// UIManager.setLookAndFeel(
// "com.seaglasslookandfeel.SeaGlassLookAndFeel");
// } catch (Exception e) {
// e.printStackTrace();
// }
// SwingUtilities.updateComponentTreeUI(frame);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
initWindow();
}
});
}
}
class CustomTabbedPane extends JPanel {
public CustomTabbedPane() {
super(new GridLayout(1, 1));
JTabbedPane tabbedPane = new JTabbedPane();
JComponent panel1 = makeTextPanel("Panel #1");
tabbedPane.addTab("AAA", panel1);
JComponent panel2 = makeTextPanel("Panel #2");
tabbedPane.addTab("BBB", panel2);
JComponent panel3 = makeTextPanel("Panel #3");
tabbedPane.addTab("CCC", panel3);
JComponent panel4 = makeTextPanel("Panel #4");
tabbedPane.addTab("DDD", panel4);
add(tabbedPane);
tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
}
protected JComponent makeTextPanel(String text) {
JPanel panel = new JPanel();
JLabel filler = new JLabel(text);
filler.setHorizontalAlignment(JLabel.CENTER);
panel.setLayout(new GridLayout(1, 1));
panel.add(filler);
return panel;
}
}
Although I knew that Java Swing's default platform-dependent look and feel was different across various platforms, I never imagined that the JTabbedPane would look so different from what was shown on the tutorial:
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