c.java

JGraph扩展应用。自定义Renderer,自定义视图View实现自定义工作流控件

/**
 * 
 */
package flow.graph.test.test;

/**
 * @author Administrator
 *
 */
import javax.swing.*; 
import javax.swing.table.*; 
import java.awt.*; 

public class C extends JFrame { 
public C() { 
JTable tbl = new JTable(new String[][]{{ 
"JTable 里单元格内容的显示器是 TableCellRenderer。", 
"默认的显示器（DefaultTableCellRenderer）继承 JLabel 所以不方便多行显示。", 
"要多行显示应该继承 JTextArea（参看下面的 TableCellTextAreaRenderer 类）。", 
"当然，别忘了调用 JTable.setDefaultRenderer() 登记你的显示器。"}}, 
"A B C D".split(" ")); 
tbl.setDefaultRenderer(Object.class, new TableCellTextAreaRenderer()); 
JLabel l = new JLabel();

add(new JScrollPane(tbl)); 
setSize(800, 200); 
setVisible(true); 
setDefaultCloseOperation(EXIT_ON_CLOSE); 
} 

public static void main(String[] args) { new C(); } 
} 

class TableCellTextAreaRenderer extends JTextArea implements TableCellRenderer { 
public TableCellTextAreaRenderer() { 
setLineWrap(true); 
setWrapStyleWord(true); 
} 

public Component getTableCellRendererComponent(JTable table, Object value, 
boolean isSelected, boolean hasFocus, int row, int column) { 
// 计算当下行的最佳高度 
int maxPreferredHeight = 0; 
for (int i = 0; i < table.getColumnCount(); i++) { 
setText("" + table.getValueAt(row, i)); 
setSize(table.getColumnModel().getColumn(column).getWidth(), 0); 
maxPreferredHeight = Math.max(maxPreferredHeight, getPreferredSize().height); 
} 

if (table.getRowHeight(row) != maxPreferredHeight) // 少了这行则处理器瞎忙 
table.setRowHeight(row, maxPreferredHeight); 

setText(value == null ? "" : value.toString()); 
return this; 
} 
}