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我想在JTable列上設置一個JProgressbar單元格渲染器。問題是,在我的表格單元格上不會顯示任何ProgressBar,它只是顯示進度值。Progressbar TableCellRenderer不起作用
這是我的TableModel:
public class DownloadTableModel extends AbstractTableModel {
private String[] columnNames = { "Song", "Artist", "Album", "Progress", "Size", "Path", "Date" };
private List<Track> songDownloads = new ArrayList<Track>();
public DownloadTableModel() {
}
public DownloadTableModel(List<Song> songs) {
for (Song song : songs) {
Track track = Services.getDownloadService().download(song);
songDownloads.add(track);
fireTableDataChanged();
}
}
@Override
public int getColumnCount() {
return columnNames.length;
}
@Override
public int getRowCount() {
return songDownloads == null ? 0 : songDownloads.size();
}
@Override
public String getColumnName(int col) {
return columnNames[col];
}
public Object getValueAt(int rowIndex, int columnIndex) {
Track songDownload = songDownloads.get(rowIndex);
switch (columnIndex) {
case 0: return songDownload.getSong().getName();
case 1: return songDownload.getSong().getArtist().getName();
case 2: return songDownload.getSong().getAlbum().getName();
case 3: return songDownload.getProgress();
case 4: return songDownload.getSize();
case 5: return songDownload.getPath();
case 6: return songDownload.getDate();
}
return null;
}
public void setValueAt(Object obj, Track songDownload, int col) {
int index = songDownloads.indexOf(songDownload);
setValueAt(obj, col, index);
fireTableCellUpdated(index, col);
updateSongDownloads();
}
@Override
public Class<?> getColumnClass(int column) {
if(songDownloads.size() > 0 && getRowCount() > 0) {
return getValueAt(0, column).getClass();
} else {
switch (column) {
case 0: return String.class;
case 1: return String.class;
case 2: return String.class;
case 3: return Integer.class;
case 4: return String.class;
case 5: return String.class;
case 6: return String.class;
default: return Object.class;
}
}
}
@Override
public boolean isCellEditable(int row, int col) {
return false;
}
public List<Track> getSongDownloads() {
return songDownloads;
}
public void setSongDownloads(List<Track> songDownloads) {
this.songDownloads = songDownloads;
fireTableStructureChanged();
updateSongDownloads();
}
public Track getSongDownload(Song song) {
for(Track songDownload : songDownloads) {
if(songDownload.getSong().equals(song)) {
return songDownload;
}
}
return null;
}
public int getSongDownloadIndex(Song song) {
for(Track songDownload : songDownloads) {
if(songDownload.getSong().equals(song)) {
return songDownloads.indexOf(songDownload);
}
}
return -1;
}
public void removeRow(int row) {
songDownloads.remove(row);
fireTableDataChanged();
updateSongDownloads();
}
public void removeRow(Track songDownload) {
songDownloads.remove(songDownload);
fireTableDataChanged();
updateSongDownloads();
}
public void addRow(Track songDownload) {
songDownloads.add(songDownload);
fireTableDataChanged();
updateSongDownloads();
}
public void addRow(int row, Track songDownload) {
songDownloads.add(row, songDownload);
fireTableDataChanged();
updateSongDownloads();
}
public void updateSongDownloads() {
Main.getConfig().setDownloads(songDownloads);
}
public void fireTableCellUpdated(Song song, int col) {
fireTableCellUpdated(getSongDownloadIndex(song), col);
}
}
然後JTable的:
downloadTable = new javax.swing.JTable();
downloadTable.setModel(new groovesquid.gui.DownloadTableModel());
downloadTable.getColumn("Progress").setCellRenderer(new ProgressCellRenderer());
downloadTable.setAutoCreateRowSorter(true);
downloadTable.setFocusable(false);
downloadTable.setGridColor(new java.awt.Color(204, 204, 204));
downloadTable.setRequestFocusEnabled(false);
downloadTable.setRowHeight(20);
downloadTable.getTableHeader().setReorderingAllowed(false);
jScrollPane2.setViewportView(downloadTable);
而且我的TableCellRenderer:
public class ProgressCellRenderer extends JProgressBar implements TableCellRenderer {
ProgressCellRenderer() {
super(0, 100);
setValue(0);
setString("initializing...");
setStringPainted(true);
}
@Override
public boolean isDisplayable() {
// This does the trick. It makes sure animation is always performed
return true;
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
String text = "";
Color foregroundColor = Color.BLACK;
this.setForeground(foregroundColor);
this.setValue((Integer)value);
this.setString(text);
return this;
}
}
1)爲了更快地獲得更好的幫助,請發佈[SSCCE](http://sscce.org/)。 2)*不要阻塞EDT(Event Dispatch Thread) - 當發生這種情況時,GUI將「凍結」。而是爲長時間運行的任務實施'SwingWorker'。有關更多詳細信息,請參閱[併發中的Swing](http://docs.oracle.com/javase/tutorial/uiswing/concurrency/)。 –
感謝您的提示,但我究竟在哪裏阻止了EDT? – Marius
發佈SSCCE&我會進一步評論。 –