訪問其中包含JTable的JScrollpane

Question

我在JScrollpane內部有一個JTable。我無權訪問JScrollpane變量。但我有權訪問JTable。現在我怎樣才能使用JTable訪問JScrollpane。

For Example -> mytable.getAncestor(...) or something? 

Answer 1

如果你想從你的JTable的

JTable jTable = new JTable(rowData, colData); 
JScrollPane scrollPane = new JScrollPane(jTable); 
// now you have the ViewPort 
JViewport parent = (JViewport)jTable.getParent(); 
JScrollPane enclosing = (JScrollPane)parent.getParent(); 

嘗試下面的代碼獲得JScrollPane的..

import java.awt.BorderLayout; 
import java.awt.Container; 
import java.awt.Dimension; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JRootPane; 
import javax.swing.JScrollBar; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 

/** 
* 
* @author Patrick Ott <Patrick.Ott@professional-webworkx.de> 
* @version 1.0 
*/ 
public class MainFrame extends JFrame { 

    private String[][] rowData = 
    { 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Max", "Mustermann", "Musterhausen"}, 
     {"Petra", "Mustermann", "Musterhausen"} 
    }; 

    private String[] columnData = 
    { 
     "Firstname", "Lastname", "City" 
    }; 
    private JTable jTable; 

    public MainFrame() { 
     jTable = new JTable(rowData, columnData); 
     jTable.setName("CRM Table"); 
    } 

    public void createAndShowGui() { 
     this.setTitle("JTable in JScrollPane"); 
     this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

     this.getContentPane().add(new JLabel("CRM System"), BorderLayout.NORTH); 
     JScrollPane scrollPane = new JScrollPane(jTable); 
     this.getContentPane().add(scrollPane, BorderLayout.CENTER); 
     this.setSize(new Dimension(1024, 768)); 
     this.setVisible(true); 
     Container parent = jTable.getParent().getParent(); 
     JScrollPane enclosing = (JScrollPane)parent; 
     parent.remove(jTable); 
     parent.add(new JLabel("Test")); 
     // System.out.println(enclosing.getClass().getSimpleName()); 
    } 
} 

帕特里克

Answer 2

假設的JTable放在JScrollPane中作爲內是常用的：

JTable table = ...; 
JScrollPane scrollPane = new JScrollPane(table); 

您可以訪問使用的getParent（）獲取視野和使用的getParent包表中的滾動窗格（）在視口上得到滾動窗格。

JScrollPane enclosingScrollPane = (JScrollPane) table.getParent().getParent() 

在最壞的情況，如果你因爲某些原因表不知道是否在裏面滾動窗格或沒有，你將有鑄造前檢查的instanceof表」父組件的。