编辑：[已解决]：每次我尝试增加和减小字体大小时,都会调用CustomTableCellRenderer的getTableCellRendererComponent.
因此,我更新了代码,以照顾这种方法本身的字体大小.我正在使用静态变量来跟踪当前字体大小(这是因为此值将影响当前在我的UI中显示的所有表的字体大小)
我已经更新了代码以解决此问题.欢迎对此发表任何意见/反馈.再次感谢！
我要解决的问题是基于对另一个JLabel的单击来动态更改(即增加/减小)JTable中的字体大小
我有一个包含两个标签(用于增加/减小字体大小)和一个JTable的面板.我在此表上附加了一个自定义TableCellRenderer.
创建表的代码如下：
JTable table = new JTable(data, tableHeader){
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row,
int column) {
Component component = super.prepareRenderer(renderer, row, column);
int rendererWidth = component.getPreferredSize().width;
TableColumn tableColumn = getColumnModel().getColumn(column);
tableColumn.setPreferredWidth(Math.max(rendererWidth +
getIntercellSpacing().width + 10,
tableColumn.getPreferredWidth()));
return component;
}
};
table.setPreferredScrollableViewportSize(new Dimension(5000, 200));
table.setFillsViewportHeight(true);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setDefaultRenderer(table.getColumnClass(0), new CustomTableCellRenderer());
自定义TableCellRenderer实现如下：
public class CustomTableCellRenderer extends DefaultTableCellRenderer {
private Font customFont;
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column) {
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
customFont = component.getFont();
customFont = new Font(customFont.getName(), customFont.getStyle(), MainUI.DEFAULT_TABLE_FONT_SIZE);
component.setFont(customFont);
if (value.toString().matches("(?i:.*error.*)")) {
c.setForeground(Color.RED);
} else {
c.setForeground(Color.BLACK);
}
return c;
}
public void increaseFontSize(){
MainUI.DEFAULT_TABLE_FONT_SIZE = getFont().getSize() + 1;
}
public void decreaseFontSize(){
MainUI.DEFAULT_TABLE_FONT_SIZE = getFont().getSize() + 1;
}
}
对于该按钮,我已经附加了一个鼠标侦听器并在mouseClicked事件上进行了以下尝试,以实现该功能：
if(table.getDefaultRenderer(table.getColumnClass(0)) instanceof CustomTableCellRenderer){
CustomTableCellRenderer tableCellRenderer = (CustomTableCellRenderer) table.getDefaultRenderer(table.getColumnClass(0));
tableCellRenderer.increaseFontSize();
table.repaint();
}
但是,我看不到表格中的任何变化.我究竟做错了什么？以及如何实现所需的功能？
任何意见/建议将不胜感激.谢谢！
解决方法:
>基本上,您必须设置JTable#setFont()
>在渲染器中,您可以增加FontSize取决于
a)TableCell中的值
b)行或列索引
c)isSelected和hasFocus
>在Renderer中最好覆盖isSelected和hasFocus
>对于JTable,无需在TabelModel和ColumnModel中进行更改即可独家使用prepareRender(我的观点是,我喜欢prepareRenderer)
编辑
我将更改JTable#setFont(),而不是将其增加到Renderer中,然后将更改的Font应用于行,列或选择
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.font.TextAttribute;
import java.util.Map;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.MatteBorder;
import javax.swing.table.*;
public class TablePrepareRenderer extends JFrame {
private static final long serialVersionUID = 1L;
private JTable table;
public TablePrepareRenderer() {
Object[] columnNames = {"Type", "Company", "Shares", "Price", "Boolean"};
Object[][] data = {
{"Buy", "IBM", new Integer(1000), new Double(80.50), false},
{"Sell", "MicroSoft", new Integer(2000), new Double(6.25), true},
{"Sell", "Apple", new Integer(3000), new Double(7.35), true},
{"Buy", "Nortel", new Integer(4000), new Double(20.00), false}
};
DefaultTableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
table = new JTable(model) /*{
private static final long serialVersionUID = 1L;
private Border outside = new MatteBorder(1, 0, 1, 0, Color.red);
private Border inside = new EmptyBorder(0, 1, 0, 1);
private Border highlight = new CompoundBorder(outside, inside);
@Override
public Component prepareRenderer(TableCellRenderer renderer, int row, int column) {
Component comp = super.prepareRenderer(renderer, row, column);
JComponent jc = (JComponent) comp;
Map attributes = (table.getFont()).getAttributes();
//attributes.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD);
attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
if (!isRowSelected(row)) {
comp.setForeground(Color.black);
comp.setBackground(row % 2 == 0 ? Color.white : Color.orange);
int modelRow = convertRowIndexToModel(row);
String type = (String) getModel().getValueAt(modelRow, 0);
if (type.equals("Sell")) {
comp.setFont(new Font(attributes));
comp.setForeground(Color.red);
} else {
comp.setFont(table.getFont());
}
} else {
comp.setFont(table.getFont());
}
jc.setBorder(BorderFactory.createCompoundBorder(jc.getBorder(), BorderFactory.createEmptyBorder(0, 0, 0, 5)));
return comp;
}
}*/;
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
JButton increase = new JButton("+");
increase.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Font font = table.getFont();
font = font.deriveFont((float) (font.getSize2D() * 1.10));
table.setFont(font);
}
});
add(increase, BorderLayout.EAST);
JButton decrease = new JButton("-");
decrease.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Font font = table.getFont();
font = font.deriveFont((float) (font.getSize2D() * .90));
table.setFont(font);
}
});
add(decrease, BorderLayout.WEST);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
TablePrepareRenderer frame = new TablePrepareRenderer();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
标签：swing,jtable,java 来源： https://codeday.me/bug/20191101/1981679.html
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