如何为渲染器类提供一个布尔变量,例如 btnClicked,该变量初始化为 false,但在按钮的 ActionListener 中设置为 true,该侦听器还指示表重新绘制自身。然后在渲染器本身中,您可以使用 selected 属性来查看单元格是否被选中。也许是这样的:
private boolean btnClicked = false;
public void setBtnClicked(boolean btnClicked) {
this.btnClicked = btnClicked;
}
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (btnClicked) {
if (isSelected) {
setBackground(Color.black);
} else {
setBackground(Color.blue);
}
} else {
// if button not clicked
setBackground(Color.lightGray);
}
return this;
}
还关于:
显然我需要一些不同的逻辑来解决这个颜色记忆问题。任何关于这方面的想法都会很棒。
你所说的“颜色记忆问题”是什么?
Edit 1
这是我的意思的一个可编译的例子。不过,我仍然不确定你所说的颜色记忆问题是什么意思,抱歉。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
@SuppressWarnings("serial")
public class DisplaySelectedTableCells extends JPanel {
public static final Integer[][] DATA = {
{1, 2, 3}, {4, 5, 6}, {7, 8, 9},
{1, 2, 3}, {4, 5, 6}, {7, 8, 9},
{1, 2, 3}, {4, 5, 6}, {7, 8, 9}
};
public static final String[] COLS = {"A", "B", "C"};
private static final int PREF_WIDTH = 400;
private static final int PREF_HEIGHT = 300;
private DefaultTableModel model = new DefaultTableModel(DATA, COLS) {
@Override
public Class<?> getColumnClass(int columnIndex) {
return Integer.class;
}
};
private JTable table = new JTable(model);
private JToggleButton toggleBtn = new JToggleButton("Show Selected Rows");
private MyCellRenderer myCellRenderer = new MyCellRenderer();
public DisplaySelectedTableCells() {
table.setDefaultRenderer(Integer.class, myCellRenderer);
JPanel btnPanel = new JPanel();
btnPanel.add(toggleBtn);
setLayout(new BorderLayout());
add(new JScrollPane(table), BorderLayout.CENTER);
add(btnPanel, BorderLayout.SOUTH);
toggleBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
myCellRenderer.setShowSelected(toggleBtn.isSelected());
table.repaint();
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(PREF_WIDTH, PREF_HEIGHT);
}
private static class MyCellRenderer extends DefaultTableCellRenderer {
private static final Color SELECTED_COLOR = Color.pink;
private static final Color UNSELECTED_COLOR = Color.lightGray;
private static final Color BASE_COLOR = null;
private boolean showSelected = false;
public void setShowSelected(boolean showSelected) {
this.showSelected = showSelected;
}
@Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
Component superComponent = super.getTableCellRendererComponent(table, value, isSelected, hasFocus,
row, column);
if (showSelected) {
if (isSelected) {
superComponent.setBackground(SELECTED_COLOR);
} else {
superComponent.setBackground(UNSELECTED_COLOR);
}
} else {
superComponent.setBackground(BASE_COLOR);
}
return superComponent;
}
}
private static void createAndShowUI() {
JFrame frame = new JFrame("DisplaySelectedTableCells");
frame.getContentPane().add(new DisplaySelectedTableCells());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
createAndShowUI();
}
});
}
}