[英]Changing the color of a specific cell in JTABLE
我正在研究课程,并且一直在努力3个星期,以便仅更改特定单元格的颜色。 根据某些条件,我需要红色和绿色:
private static void showGUI(){
JTable table = new JTable() ;
class BoardTableCellRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasocus, int row, int col)
{
this.setOpaque(true);
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasocus, row, col);
Color redColor = Color.RED;
Color greenColor = Color.GREEN;
//books color
for(int i=0;i<bookCount;i++){
if (library.bookArray[i].getAvailability()==1){
c.setForeground(redColor);
}else{
c.setForeground(greenColor);
}}
return c;
}
}
String columnNames[] = {"Book", "DVD"};
Object[][] data = new String[library.bookCount+1][library.dvdCount+1];
if(bookCount>0){
for(int i=0; i<bookCount;i++){
data[i][0]=(i+1)+". ISBN: "+library.bookArray[i].getISBN()+" / Title: "+library.bookArray[i].getTitle()+" / Author name: " + library.bookArray[i].getAuthorName() + " / Author Origin: " + library.bookArray[i].getAuthorOrigin() + " / Sector: " + library.bookArray[i].getSector()+" / Publication Date: " + library.bookArray[i].getPubDate() + " / Publisher: " + library.bookArray[i].getPublisherName()+" / Total pages: " + library.bookArray[i].getTotalPages();
}
}
//DVD
if (dvdCount>0){
for(int i=0; i<dvdCount;i++){
data[i][1]=(i+1)+". ISBN: "+library.dvdArray[i].getISBN()+" / Title: "+library.dvdArray[i].getTitle()+"Language: "+library.dvdArray[i].getLanguage()+" Subtitle: "+library.dvdArray[i].getSubtitle()+" Sector: "+library.dvdArray[i].getSector()+"Publication Date: "+library.dvdArray[i].getPubDate()+" Producer: "+library.dvdArray[i].getProducer()+" Actors: "+library.dvdArray[i].getActors();
}
}
table.setDefaultRenderer(String.class, new BoardTableCellRenderer());
table.setFocusable(false);
table.setRowMargin(0);
table.setIntercellSpacing(new Dimension(0, 0));
table.setRowSelectionAllowed(false);
table.setVisible(true);
TableModel model = new DefaultTableModel(data, columnNames);
table.setModel(model);
JScrollPane scrollPane = new JScrollPane(table);
table.setGridColor(Color.BLACK);
JLabel lblName = new JLabel("Enter Title to search:");
JTextField tfName= Library.createRowFilter(table);
JPanel panel = new JPanel();
panel.setLayout(new SpringLayout());
panel.add(lblName);
panel.add(tfName);
tfName.setSize(30,30);
JFrame frame = new JFrame("Library");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scrollPane,BorderLayout.SOUTH);
frame.add(lblName,BorderLayout.BEFORE_FIRST_LINE);
frame.add(tfName,BorderLayout.LINE_START);
frame.validate();
frame.setSize(1700, 500);
frame.setVisible(true);
如您所见,我正在使用另一个类中的数组,对于不可用的书,我需要红色(.getAvailability()== 1),对于可用的书我需要绿色。 到目前为止,我尝试过的操作要么更改整个列要么更改整个行
谢谢 !
突出存在一些明显的问题(格式和长方法主体除外)。
this.setOpaque(true);
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasocus, row, col);
应该是
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
c.setOpaque(true);
而且,您应该只为要处理的书设置前景。
Color redColor = Color.RED;
Color greenColor = Color.GREEN;
//books color
for(int i=0;i<bookCount;i++){
if (library.bookArray[i].getAvailability()==1){
c.setForeground(redColor);
}else{
c.setForeground(greenColor);
}}
应该可能是:
c.setForeground(
library.bookArray[row].getAvailability()==1 ?
Color.RED :
Color.GREEN
);
编辑:接下来,我注意到您已将String
类型的列的自定义渲染器设置为默认值,但尚未设置列的Class
(除非您自己进行检查,否则不会检查单个单元格值的运行时类型)。 最好为TableColumn.setCellRenderer
的相关列调用TableColumnModel
。
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