java - 动态更改 JTable 字体大小

Question

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编辑:[已解决]:似乎每次我尝试增大和减小字体大小时都会调用 CustomTableCellRenderer 的 getTableCellRendererComponent。

所以我更新了我的代码以处理此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(这是因为该值会影响当前显示在我的 UI 中的所有表格的字体大小)

我已经更新了代码来处理这个问题。欢迎对此提出任何意见/反馈。再次感谢!

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我要解决的问题是根据对不同 JLabel 的单击动态更改(即增加/减小)JTable 中的字体大小

我有一个面板，其中包含两个标签(用于增大/减小字体大小)和一个 JTable。我为该表附加了一个自定义 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());

自定义的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;
    }

}

对于按钮，我附加了鼠标监听器和 mouseClicked 事件，我正在尝试执行以下操作以实现功能:

if(table.getDefaultRenderer(table.getColumnClass(0)) instanceof CustomTableCellRenderer){
    CustomTableCellRenderer tableCellRenderer = (CustomTableCellRenderer) table.getDefaultRenderer(table.getColumnClass(0));
    tableCellRenderer.increaseFontSize();
    table.repaint();            
}

但是我没有看到表格中有任何变化。我究竟做错了什么？我如何实现所需的功能？

如有任何意见/建议，我们将不胜感激。谢谢!

Answer 1

• 基本上你必须设置 JTable#setFont()

• 在渲染器中你可以增加 FontSize 取决于

  a) TableCell 中的值

  b) 行或列索引

  c) isSelected 和 hasFocus

• 在渲染器中最好覆盖 isSelected 和 hasFocus

• 对于不更改 TabelModel 和 ColumnModel 的 JTable 以独占使用 prepareRender(我认为我喜欢 prepareRenderer)

编辑

我会更改 JTable#setFont()，而不是将其增加到渲染器中，然后将更改后的字体应用于行、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);
            }
        });
    }
}