对所有这个gr8 StackOverflow社区的问候。这是我尝试自己解决它后的第一个问题,因此有点长... :-)
JSpinner在按下箭头时没有显示最小值
我在使用向下箭头键获取最小指定值JSpinner
时遇到问题。它接受如果在文本字段中键入的值。其他一切正常。奇怪的部分是,这只发生在Spinner模型的某些组合中,具体为new SpinnerNumberModel(29.6, 29.6, 118.1, 0.1)
和new SpinnerNumberModel(2.00, 2.00, 6.00, 0.01)
。下面看到有这个问题的2 JSpinners
的代码。我不确定为什么这些模型会产生问题,以及是否有更多的模型存在这个问题。
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
public class JSpinnerBug {
private JFrame frame;
private JSpinner spinner;
private JSpinner spinner_1;
private JButton btnChangeValue_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JSpinnerBug window = new JSpinnerBug();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public JSpinnerBug() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridBagLayout gridBagLayout = new GridBagLayout();
gridBagLayout.columnWidths = new int[]{119, 88, 105, 0};
gridBagLayout.rowHeights = new int[]{25, 0, 0};
gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, Double.MIN_VALUE};
gridBagLayout.rowWeights = new double[]{0.0, 0.0, Double.MIN_VALUE};
frame.getContentPane().setLayout(gridBagLayout);
JButton btnChangeValue = new JButton("Change Value");
btnChangeValue.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
spinner.setValue(2.00);
}
});
spinner = new JSpinner();
spinner.setModel(new SpinnerNumberModel(2.01, 2.00, 6.00, 0.01));
GridBagConstraints gbc_spinner = new GridBagConstraints();
gbc_spinner.fill = GridBagConstraints.HORIZONTAL;
gbc_spinner.insets = new Insets(0, 0, 5, 5);
gbc_spinner.gridx = 1;
gbc_spinner.gridy = 0;
frame.getContentPane().add(spinner, gbc_spinner);
GridBagConstraints gbc_btnChangeValue = new GridBagConstraints();
gbc_btnChangeValue.insets = new Insets(0, 0, 5, 0);
gbc_btnChangeValue.anchor = GridBagConstraints.NORTHWEST;
gbc_btnChangeValue.gridx = 2;
gbc_btnChangeValue.gridy = 0;
frame.getContentPane().add(btnChangeValue, gbc_btnChangeValue);
spinner_1 = new JSpinner();
spinner_1.setModel(new SpinnerNumberModel(29.7, 29.6, 118.1, 0.1));
GridBagConstraints gbc_spinner_1 = new GridBagConstraints();
gbc_spinner_1.fill = GridBagConstraints.HORIZONTAL;
gbc_spinner_1.insets = new Insets(0, 0, 0, 5);
gbc_spinner_1.gridx = 1;
gbc_spinner_1.gridy = 1;
frame.getContentPane().add(spinner_1, gbc_spinner_1);
btnChangeValue_1 = new JButton("Change Value");
btnChangeValue_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
spinner_1.setValue(29.6);
}
});
GridBagConstraints gbc_btnChangeValue_1 = new GridBagConstraints();
gbc_btnChangeValue_1.gridx = 2;
gbc_btnChangeValue_1.gridy = 1;
frame.getContentPane().add(btnChangeValue_1, gbc_btnChangeValue_1);
}
/**
* Custom Spinner to detect button click on
* JSpinner. This class fixes a bug for
* JSpinner like for example for minimum value = 2.00
* and step size 0.01
*
* @author dARKpRINCE
*
*/
class CustomSpinner extends JSpinner{
@Override
public Object getPreviousValue() {
// Circumvent JSpinner bug
NumberEditor spinnerEditor = (NumberEditor) this.getEditor();
SpinnerNumberModel model = spinnerEditor.getModel();
if(model.getMinimum().equals(2.00) && model.getStepSize().equals(0.01)){
if ((Double) getValue() == 2.01) {
return 2.00;
}
else {
return super.getPreviousValue();
}
}
else if(model.getMinimum().equals(29.6) && model.getStepSize().equals(0.1)){
if ((Double) getValue() == 29.7) {
return 29.6;
}
else {
return super.getPreviousValue();
}
}
else {
return super.getPreviousValue();
}
}
}
}
随意尝试其他型号,如new SpinnerNumberModel(55.3, 55.3, 118.1, 0.1)
。随着它的工作。
我的解决方案是扩展JSpinner(在代码示例末尾给出),并关注每个创建此问题的模型,但这不是最优的。因此,每个JSpinner
被替换为CustomSpinner
。
我也检查了JSpinner的源代码,但无法确定/解决问题。任何人都可以告诉我,如果这是一个错误,并且如何最优地修复它?为JSpinner使用第三方库是我最后的选择。
为了更好地帮助越早,张贴[MCVE(http://stackoverflow.com/help/mcve)。 –
@Andrew Thompson:我真的不知道如何使它更紧凑。这个代码示例只包含手头的问题。 – dARKpRINCE
C不代表'紧凑'。为什么不尝试*阅读(一个屏幕全文)文章,而不是随机猜测? –