jtableセルで行を折り返す方法は？
このチュートリアル で説明されているように、カスタムTableRendererを実装しようとしています。レンダラーに、指定されたセルで長すぎる各テキストを行折り返しさせたいと思います。行折り返しをサポートしているので、レンダラーとしてTextAreaを使用するという考えです。ただし、次のコードは期待どおりに動作しません。
_public class LineWrapCellRenderer extends JTextArea implements TableCellRenderer {
@Override
public Component getTableCellRendererComponent(
JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column) {
this.setText((String)value);
this.setWrapStyleWord(true);
this.setLineWrap(true);
return this;
}
}
_このレンダラーを
_table.setDefaultRenderer(String.class, new LineWrapCellRenderer());
_ただし、セルエントリはラップされません。 this.setBackground(Color.YELLOW)をgetTableCellRendererComponent()メソッドに追加すると、すべてのセルが期待どおりに黄色になりますが、ラップされません。
何か案は？
UPDATE：Michael Borgwardtがコメントで述べたように、問題は行の折り返しではなく、行の高さです：JTablesの行はサイズが固定されているため、セルが高くなっているため（テキストが複数行になるため）、行の高さを増やす必要があります。しかし、どのくらいですか？これが別のSOの質問に値するかどうかを確認します。そうでない場合は、このソリューションをここに追加します。
Update2：次のコードは、行の高さを決定します（getTableCellRendererComponent()に配置されている場合）：
_int fontHeight = this.getFontMetrics(this.getFont()).getHeight();
int textLength = this.getText().length();
int lines = textLength / this.getColumns() +1;//+1, cause we need at least 1 row.
int height = fontHeight * lines;
table.setRowHeight(row, height);
_問題は、JTableの行の高さが固定されているため、ラップするレンダラーがあるかどうかだけではありません。なぜそうなのかはわかりませんが、もしそうなら、折り返されたテキストが切り取られます-あるいは、それがまさにあなたが見ているものです。行の高さを調整するには、それらを個別に設定する必要があります。
こんにちは私は同じ問題を抱えていましたが、私が実装したソリューションは、Java複数行テキストを描画するためのチュートリアルとテキストAPIを使用してセルにテキストを描画するから入手できるサンプルに触発されました。
http://Java.Sun.com/docs/books/tutorial/2d/text/drawmulstring.html
import Java.awt.Component;
import Java.awt.Font;
import Java.awt.Graphics;
import Java.awt.Graphics2D;
import Java.awt.font.FontRenderContext;
import Java.awt.font.LineBreakMeasurer;
import Java.awt.font.TextLayout;
import Java.text.AttributedCharacterIterator;
import Java.text.AttributedString;
import Java.text.BreakIterator;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
public class MultilineTableCell
implements TableCellRenderer {
class CellArea extends DefaultTableCellRenderer {
/**
*
*/
private static final long serialVersionUID = 1L;
private String text;
protected int rowIndex;
protected int columnIndex;
protected JTable table;
protected Font font;
private int paragraphStart,paragraphEnd;
private LineBreakMeasurer lineMeasurer;
public CellArea(String s, JTable tab, int row, int column,boolean isSelected) {
text = s;
rowIndex = row;
columnIndex = column;
table = tab;
font = table.getFont();
if (isSelected) {
setForeground(table.getSelectionForeground());
setBackground(table.getSelectionBackground());
}
}
public void paintComponent(Graphics gr) {
super.paintComponent(gr);
if ( text != null && !text.isEmpty() ) {
Graphics2D g = (Graphics2D) gr;
if (lineMeasurer == null) {
AttributedCharacterIterator paragraph = new AttributedString(text).getIterator();
paragraphStart = paragraph.getBeginIndex();
paragraphEnd = paragraph.getEndIndex();
FontRenderContext frc = g.getFontRenderContext();
lineMeasurer = new LineBreakMeasurer(paragraph,BreakIterator.getWordInstance(), frc);
}
float breakWidth = (float)table.getColumnModel().getColumn(columnIndex).getWidth();
float drawPosY = 0;
// Set position to the index of the first character in the paragraph.
lineMeasurer.setPosition(paragraphStart);
// Get lines until the entire paragraph has been displayed.
while (lineMeasurer.getPosition() < paragraphEnd) {
// Retrieve next layout. A cleverer program would also cache
// these layouts until the component is re-sized.
TextLayout layout = lineMeasurer.nextLayout(breakWidth);
// Compute pen x position. If the paragraph is right-to-left we
// will align the TextLayouts to the right Edge of the panel.
// Note: this won't occur for the English text in this sample.
// Note: drawPosX is always where the LEFT of the text is placed.
float drawPosX = layout.isLeftToRight()
? 0 : breakWidth - layout.getAdvance();
// Move y-coordinate by the ascent of the layout.
drawPosY += layout.getAscent();
// Draw the TextLayout at (drawPosX, drawPosY).
layout.draw(g, drawPosX, drawPosY);
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getDescent() + layout.getLeading();
}
table.setRowHeight(rowIndex,(int) drawPosY);
}
}
}
public Component getTableCellRendererComponent(
JTable table, Object value,boolean isSelected, boolean hasFocus, int row,int column
)
{
CellArea area = new CellArea(value.toString(),table,row,column,isSelected);
return area;
}
}
行の高さもサイズ変更しますが、このレンダラーが単一の列に使用されている場合にのみうまく機能します。
これが、テーブルをレンダリングするために呼び出す方法です。
final int wordWrapColumnIndex = ...;
myTable = new JTable() {
public TableCellRenderer getCellRenderer(int row, int column) {
if (column == wordWrapColumnIndex ) {
return wordWrapRenderer;
}
else {
return super.getCellRenderer(row, column);
}
}
};
この質問に加えて、マルチラインセルエディターのソリューションを共有したいと思います。これは少しハッキーです（編集された行への参照を格納します）が、その仕事をします。
import javax.swing.*;
import javax.swing.table.TableCellEditor;
import Java.awt.*;
import Java.awt.event.ComponentAdapter;
import Java.awt.event.ComponentEvent;
import Java.awt.event.KeyAdapter;
import Java.awt.event.KeyEvent;
class MultilineTableCellEditor extends AbstractCellEditor implements TableCellEditor {
JComponent component = new JTextArea();
JTable table;
int lastRowIndex;
public MultilineTableCellEditor() {
JTextArea textArea = ((JTextArea) component);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
textArea.addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
super.componentResized(e);
table.setRowHeight(lastRowIndex, (int) (textArea.getPreferredSize().getHeight()));
}
});
textArea.addKeyListener(new KeyAdapter() {
@Override
public void keyTyped(KeyEvent e) {
super.keyTyped(e);
table.setRowHeight(lastRowIndex, (int) (textArea.getPreferredSize().getHeight()));
}
});
}
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected,
int rowIndex, int vColIndex) {
this.table = table;
lastRowIndex = rowIndex;
((JTextArea) component).setText((String) value);
component.setFont(table.getFont());
return component;
}
public Object getCellEditorValue() {
return ((JTextArea) component).getText();
}
}
そのまま使用：
JTable table = new JTable(tableModel) {
// Cell renderer by Alessandro Rossi (posted as solution to this question)
MultilineTableCell renderer = new MultilineTableCell();
MultilineTableCellEditor editor = new MultilineTableCellEditor();
@Override
public TableCellRenderer getCellRenderer(int row, int column) {
if (column == multilineColumn) {
return renderer;
}
return super.getCellRenderer(row, column);
}
@Override
public TableCellEditor getCellEditor(int row, int column) {
if ( column == multilineColumn ) {
return editor;
}
return super.getCellEditor(row, column);
}
};
私はこの同じ問題に出くわしました、そしてそれがここに書かれたコードを少し修正する必要があったので、私は自分のバージョンを添付します：
import Java.awt.Component;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.table.TableCellRenderer;
public class LineWrapCellRenderer extends JTextArea implements TableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
this.setText((String) value);
this.setWrapStyleWord(true);
this.setLineWrap(true);
int fontHeight = this.getFontMetrics(this.getFont()).getHeight();
int textLength = this.getText().length();
int lines = textLength / this.getColumnWidth();
if (lines == 0) {
lines = 1;
}
int height = fontHeight * lines;
table.setRowHeight(row, height);
return this;
}
}
JLabelをレンダラーとして使用して、テキストをHTMLタグに挿入し、必要に応じて<br>を追加するだけです。
レンダラーコンポーネントでsetBoundsを使用します（以下を参照）
import Java.awt.*;
import Java.io.*;
import Java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
public class MultiWrapColDemo {
public static void main(String[] args) throws FileNotFoundException {
EventQueue.invokeLater(new ShowIt());
}
}
class ShowIt implements Runnable {
@Override
public void run() {
JTable table = new JTable();
table.getColumnModel().addColumnModelListener( new WrapColListener( table ) );
table.setDefaultRenderer( Object.class, new JTPRenderer() );
// examples:
// table.setIntercellSpacing( new Dimension( 40, 20 ));
// table.setIntercellSpacing( new Dimension( 4, 2 ));
Vector<Vector<String>> dataVector = new Vector<Vector<String>>();
String lorem1 = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore";
String lorem2 = "et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
for (int i = 0; i < 12; i++) {
Vector<String> row = null;
if (i % 4 == 0) {
row = new Vector<String>(Arrays.asList(new String[] { "iggle", lorem1, "poggle", "poke" }));
} else if (i % 4 == 1) {
row = new Vector<String>(Arrays.asList(new String[] { lorem2, "piggle", "poggle", lorem1 }));
} else if (i % 4 == 2) {
row = new Vector<String>(Arrays.asList(new String[] { lorem1, "piggle", lorem2, "poke" }));
} else
row = new Vector<String>(Arrays.asList(new String[] { "iggle", lorem2, "poggle", lorem2 }));
dataVector.add(row);
}
Vector<String> columnIdentifiers = new Vector<String>(Arrays.asList(new String[] { "iggle", "piggle", "poggle",
"poke" }));
table.getTableHeader().setFont(table.getTableHeader().getFont().deriveFont(20f).deriveFont(Font.BOLD));
((DefaultTableModel) table.getModel()).setDataVector(dataVector, columnIdentifiers);
JFrame frame = new JFrame("MultiWrapColTable");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane jsp = new JScrollPane(table);
frame.getContentPane().add(jsp);
frame.pack();
frame.setBounds(50, 50, 800, 500);
frame.setVisible(true);
}
}
// if the renderer on a column (or the whole table) is not a JTextComponent calculating its preferredSize will not do
// any wrapping ... but it won't do any harm....
class JTPRenderer extends JTextPane implements TableCellRenderer {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
setText(value.toString());
return this;
}
}
class WrapColListener implements TableColumnModelListener {
JTable m_table;
WrapColListener( JTable table ){
m_table = table;
}
void refresh_row_heights() {
int n_rows = m_table.getRowCount();
int n_cols = m_table.getColumnCount();
int intercell_width = m_table.getIntercellSpacing().width;
int intercell_height = m_table.getIntercellSpacing().height;
TableColumnModel col_model = m_table.getColumnModel();
// these null checks are due to concurrency considerations... much can change between the col margin change
// event and the call to refresh_row_heights (although not in this SSCCE...)
if( col_model == null ) return;
// go through ALL rows, calculating row heights
for (int row = 0; row < n_rows; row++) {
int pref_row_height = 1;
// calculate row heights from cell, setting width constraint by means of setBounds...
for (int col = 0; col < n_cols; col++) {
Object value = m_table.getValueAt(row, col);
TableCellRenderer renderer = m_table.getCellRenderer(row, col);
if( renderer == null ) return;
Component comp = renderer.getTableCellRendererComponent( m_table, value, false, false,
row, col);
if( comp == null ) return;
int col_width = col_model.getColumn(col).getWidth();
// constrain width of component
comp.setBounds(new Rectangle(0, 0, col_width - intercell_width, Integer.MAX_VALUE ));
// getPreferredSize then returns "true" height as a function of attributes (e.g. font) and Word-wrapping
int pref_cell_height = comp.getPreferredSize().height + intercell_height;
if (pref_cell_height > pref_row_height) {
pref_row_height = pref_cell_height;
}
}
if (pref_row_height != m_table.getRowHeight(row)) {
m_table.setRowHeight(row, pref_row_height);
}
}
}
@Override
public void columnAdded(TableColumnModelEvent e) {
refresh_row_heights();
}
@Override
public void columnRemoved(TableColumnModelEvent e) {
// probably no need to call refresh_row_heights
}
@Override
public void columnMoved(TableColumnModelEvent e) {
// probably no need to call refresh_row_heights
}
@Override
public void columnMarginChanged(ChangeEvent e) {
refresh_row_heights();
}
@Override
public void columnSelectionChanged(ListSelectionEvent e) {
// probably no need to call refresh_row_heights
}
}
上記はこのSSCCEで問題なく動作します...しかし、現実の世界では、より複雑なフォント、より多くのテキスト、およびより大きなテーブルを使用すると、問題が発生し始めます。したがって、以下に新しいバージョンのListenerクラスと新しいバージョンのレンダラーを提案します（複雑なフォントの使用を導入するためだけです...）。興味があれば、これらを上記のSSCCEに置き換えてください...
/*
* This class reflects the fact that 1) when you drag a column boundary using the mouse a very large number of
* ChangeEvents are generated and 2) with more complex fonts, more text and larger tables ("real world") the amount
* of computation in calculating the row heights becomes significant and leads to an unresponsive GUI, or worse.
* This "first" strategy to address this involves setting a pause between the detection of a change event and the
* refreshing of the rows. Naturally this involves a Timer, the run() method of which is not the EDT, so it
* must then submit to EventQueue.invokeLater...
* The larger the table, the more text involved, and the more complex the fonts... the more ingenuity will have to
* be used in coping with the potentially vast amount of computation involved in getting the ideal row heights. This
* is in the nature of the beast. Ideas might involve:
* 1) adjusting the row heights immediately only for rows which are visible or likely to be visible (Viewport), and
* then making successive calls to EventQueue.invokeLater to deal with all the other rows
* 2) giving cells a "memory" of their heights as a function of the allowed width. Unfortunately it will not allow
* the possibility of interpolating intermediate values because the question of whether a line wraps may hinge on a
* single pixel difference, although an imperfect solution to this would be err on the side of caution, i.e. pretend
* that a column is a little thinner than it is to cause wrapping before it is strictly necessary... particularly when
* cells are out of view...
* ... other ideas...(?)
*/
class FirstRealWorldWrapColListener implements TableColumnModelListener {
JTable m_table;
final static long PAUSE_TIME = 50L;
Java.util.Timer m_pause_timer = new Java.util.Timer( "pause timer", true );
TimerTask m_pause_task;
class PauseTask extends TimerTask{
@Override
public void run() {
EventQueue.invokeLater( new Runnable(){
@Override
public void run() {
refresh_row_heights();
System.out.println( "=== setting m_pause_task to null..." );
m_pause_task = null;
}});
}
}
FirstRealWorldWrapColListener( JTable table ){
m_table = table;
}
void queue_refresh(){
if( m_pause_task != null ){
return;
}
System.out.println( "=== scheduling..." );
m_pause_task = new PauseTask();
m_pause_timer.schedule( m_pause_task, PAUSE_TIME );
}
void refresh_row_heights() {
int n_rows = m_table.getRowCount();
int n_cols = m_table.getColumnCount();
int intercell_width = m_table.getIntercellSpacing().width;
int intercell_height = m_table.getIntercellSpacing().height;
TableColumnModel col_model = m_table.getColumnModel();
// these null checks are due to concurrency considerations... much can change between the col margin change
// event and the call to refresh_row_heights (although not in this SSCCE...)
if( col_model == null ) return;
// go through ALL rows, calculating row heights
for (int row = 0; row < n_rows; row++) {
int pref_row_height = 1;
// calculate row heights from cell, setting width constraint by means of setBounds...
for (int col = 0; col < n_cols; col++) {
Object value = m_table.getValueAt(row, col);
TableCellRenderer renderer = m_table.getCellRenderer(row, col);
if( renderer == null ) return;
Component comp = renderer.getTableCellRendererComponent( m_table, value, false, false,
row, col);
if( comp == null ) return;
int col_width = col_model.getColumn(col).getWidth();
// constrain width of component
comp.setBounds(new Rectangle(0, 0, col_width - intercell_width, Integer.MAX_VALUE ));
// getPreferredSize then returns "true" height as a function of attributes (e.g. font) and Word-wrapping
int pref_cell_height = comp.getPreferredSize().height + intercell_height;
if (pref_cell_height > pref_row_height) {
pref_row_height = pref_cell_height;
}
}
if (pref_row_height != m_table.getRowHeight(row)) {
m_table.setRowHeight(row, pref_row_height);
}
}
}
@Override
public void columnAdded(TableColumnModelEvent e) {
// refresh_row_heights();
queue_refresh();
}
@Override
public void columnRemoved(TableColumnModelEvent e) {
// probably no need to call refresh_row_heights
}
@Override
public void columnMoved(TableColumnModelEvent e) {
// probably no need to call refresh_row_heights
}
@Override
public void columnMarginChanged(ChangeEvent e) {
// refresh_row_heights();
queue_refresh();
}
@Override
public void columnSelectionChanged(ListSelectionEvent e) {
// probably no need to call refresh_row_heights
}
}
// if the renderer on a column (or the whole table) is not a JTextComponent calculating its preferredSize will not do
// any wrapping ... but it won't do any harm....
class JTPRenderer extends JTextPane implements TableCellRenderer {
Font m_default_font, m_big_font, m_default_alternate_font, m_big_alternate_font;
HashMap<AttributedCharacterIterator.Attribute, Object> m_red_serif_attr_map;
//
JTPRenderer() {
m_default_font = getFont();
m_big_font = m_default_font.deriveFont(m_default_font.getSize() * 1.5f);
m_red_serif_attr_map = new HashMap<AttributedCharacterIterator.Attribute, Object >();
m_red_serif_attr_map.put( TextAttribute.FAMILY, Font.SERIF );
m_red_serif_attr_map.put( TextAttribute.FOREGROUND, Color.RED );
m_red_serif_attr_map.put( TextAttribute.WIDTH, TextAttribute.WIDTH_EXTENDED );
m_default_alternate_font = m_default_font.deriveFont( m_red_serif_attr_map );
m_big_alternate_font = m_big_font.deriveFont( m_red_serif_attr_map );
// simpler alternate font:
// m_default_alternate_font = m_default_font.deriveFont( Font.BOLD | Font.ITALIC );
// m_big_alternate_font = m_big_font.deriveFont( Font.BOLD | Font.ITALIC );
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
int rc = row + column;
if( rc % 4 == 2 )
setFont( rc % 5 == 1 ? m_big_alternate_font : m_default_alternate_font );
else
setFont( rc % 5 == 1 ? m_big_font : m_default_font );
setText(value.toString());
return this;
}
}
上記のように、行の高さを計算する必要がありますが、現在のソリューションを改善することができます。実際、それは私にはうまくいきませんでした。 jtxt.getColumns()はゼロを返し、ゼロ除算が発生していました。以下は、私がよりクリーンだと思うコードです。
// set the width on the jTextArea causing a calc of preferred height
jtxt.setSize(table.getWidth(), Short.MAX_VALUE);
int prefH = jtxt.getPreferredSize().height;
table.setRowHeight(row, prefH);
ヘッダーをHTMLで記述します。これが私が持っているものの例です。発生している唯一の問題は、ヘッダーの高さを調整すると、JPanelでスクロールするのに苦労することです。
myTable.getColumnModel().getColumn(1).setPreferredWidth(75);
myTable.getColumnModel().getColumn(1).setHeaderValue("<html><b>Day Of<br>Week</b></html>");