[英]JTable not honoring cell renderer's necessary height
这应该很简单,但是我不知道出了什么问题。 我需要表格以相当大的字体显示,但是表格绘制器不遵循单元格渲染器的高度。
我看过这篇文章,并且当我的首选项窗口的字体大小已更改时,它的工作非常出色。 但是,尽管渲染器知道要使用的字体大小,但初始显示中的表格使用的是标准行高(16)。 当然,桌面画家应该自动考虑渲染器的首选高度吗? 还是我实际上必须手动告诉它要使用的高度?
我尝试了如下所示对doLayout()
的调用,但没有任何区别。
这是一个SSCCE来演示此问题:
public class IncorrectRowHeight extends JPanel
{
private class MyCellRenderer extends JTextField implements TableCellRenderer
{
private MyCellRenderer()
{
setFont(new Font("SansSerif", Font.PLAIN, 30));
setBorder(BorderFactory.createEmptyBorder());
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column)
{
setText(value.toString());
return this;
}
}
public IncorrectRowHeight()
{
super(new BorderLayout());
add(new JTextField(25), BorderLayout.PAGE_START);
String[][] data = {
{"a", "b", "c", "d", "e"},
{"f", "g", "h", "i", "j"},
{"k", "l", "m", "n", "o"},
{"p", "q", "r", "s", "t"}
};
String[] cols = {"h1", "h2", "h3", "h4", "h5"};
JTable t = new JTable(data, cols);
t.setGridColor(Color.GRAY);
t.setPreferredScrollableViewportSize(new Dimension(300, 65));
TableColumnModel model = t.getColumnModel();
for (int i = 0; i < model.getColumnCount(); i++)
{
TableColumn column = model.getColumn(i);
column.setCellRenderer(new MyCellRenderer());
}
JScrollPane scroller = new JScrollPane(t);
add(scroller, BorderLayout.CENTER);
//t.doLayout(); // doesn't help matters
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("IncorrectRowHeight");
JComponent newContentPane = new IncorrectRowHeight();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args)
{
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}
它产生以下内容:
这不是火箭科学! 我究竟做错了什么?
也许这种方法可以帮助您
public static void updateRowHeight(JTable table, int margin) {
final int rowCount = table.getRowCount();
final int colCount = table.getColumnCount();
for (int i = 0; i < rowCount; i++) {
int maxHeight = 0;
for (int j = 0; j < colCount; j++) {
final TableCellRenderer renderer = table.getCellRenderer(i, j);
maxHeight = Math.max(maxHeight, table.prepareRenderer(renderer, i, j).getPreferredSize().height);
}
table.setRowHeight(i, maxHeight + margin);
}
}
在表中填充数据后,请使用此方法。 margin
参数用于行高的附加增量。 如果不需要-使用0。
这是具有正确单元格高度的示例。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
/**
* <code>IncorrectRowHeight</code>.
*/
public class IncorrectRowHeight extends JPanel {
private class MyCellRenderer extends JTextField implements TableCellRenderer {
private MyCellRenderer() {
setFont(new Font("SansSerif", Font.PLAIN, 30));
setBorder(BorderFactory.createEmptyBorder());
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
setText(value.toString());
return this;
}
}
public IncorrectRowHeight() {
super(new BorderLayout());
add(new JTextField(25), BorderLayout.PAGE_START);
String[][] data = {{"a", "b", "c", "d", "e"}, {"f", "g", "h", "i", "j"}, {"k", "l", "m", "n", "o"}, {"p", "q", "r", "s", "t"}};
String[] cols = {"h1", "h2", "h3", "h4", "h5"};
JTable t = new JTable(data, cols);
t.setGridColor(Color.GRAY);
t.setPreferredScrollableViewportSize(new Dimension(300, 65));
TableColumnModel model = t.getColumnModel();
for (int i = 0; i < model.getColumnCount(); i++) {
TableColumn column = model.getColumn(i);
column.setCellRenderer(new MyCellRenderer());
}
updateRowHeight(t, 0);
JScrollPane scroller = new JScrollPane(t);
add(scroller, BorderLayout.CENTER);
}
public static void updateRowHeight(JTable table, int margin) {
final int rowCount = table.getRowCount();
final int colCount = table.getColumnCount();
for (int i = 0; i < rowCount; i++) {
int maxHeight = 0;
for (int j = 0; j < colCount; j++) {
final TableCellRenderer renderer = table.getCellRenderer(i, j);
maxHeight = Math.max(maxHeight, table.prepareRenderer(renderer, i, j).getPreferredSize().height);
}
table.setRowHeight(i, maxHeight + margin);
}
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("IncorrectRowHeight");
JComponent newContentPane = new IncorrectRowHeight();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
}
使用table.setRowHeight(table.getFontMetrics(font).getHeight());
package com.logicbig.example;
import javax.swing.*;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import java.awt.*;
public class IncorrectRowHeight extends JPanel {
private static final Font font = new Font("SansSerif", Font.PLAIN, 30);
private class MyCellRenderer extends JTextField implements TableCellRenderer {
private MyCellRenderer() {
setFont(font);
setBorder(BorderFactory.createEmptyBorder());
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
setText(value.toString());
return this;
}
}
public IncorrectRowHeight() {
super(new BorderLayout());
add(new JTextField(25), BorderLayout.PAGE_START);
String[][] data = {
{"a", "b", "c", "d", "e"},
{"f", "g", "h", "i", "j"},
{"k", "l", "m", "n", "o"},
{"p", "q", "r", "s", "t"}
};
String[] cols = {"h1", "h2", "h3", "h4", "h5"};
JTable t = new JTable(data, cols);
t.setRowHeight(t.getFontMetrics(font).getHeight());
t.setGridColor(Color.GRAY);
t.setPreferredScrollableViewportSize(new Dimension(300, 65));
TableColumnModel model = t.getColumnModel();
for (int i = 0; i < model.getColumnCount(); i++) {
TableColumn column = model.getColumn(i);
column.setCellRenderer(new MyCellRenderer());
}
JScrollPane scroller = new JScrollPane(t);
add(scroller, BorderLayout.CENTER);
//t.doLayout(); // doesn't help matters
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("IncorrectRowHeight");
JComponent newContentPane = new IncorrectRowHeight();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
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