JTree通過單擊行上的任意位置來選擇節點

我有代碼taken from here，它允許通過單擊行上的任何位置來選擇JTree行。它在單行選擇模式下工作正常。但是，我不知道如何修改它以處理多行選擇。當用戶進行多重選擇時（例如在按住鼠標左鍵的同時按住shift鍵或控制鍵），如何區分這種情況？JTree通過單擊行上的任意位置來選擇節點

 
import java.awt.Rectangle; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 

import javax.swing.JFrame; 
import javax.swing.JTree; 
import javax.swing.SwingUtilities; 
import javax.swing.tree.DefaultMutableTreeNode; 
import javax.swing.tree.TreeNode; 


@SuppressWarnings("serial") 
public class NavTree extends JTree { 

    private boolean     fWholeRowSelectionEnabled; 
    private MouseListener   fRowSelectionListener; 
    final NavTree     fThis; 

    public NavTree(TreeNode rootNode) { 
     super(rootNode); 
     fThis = this; 
     init(); 
    } 
    public NavTree() { 
     fThis = this; 
     init(); 
    } 

    private void init() { 
     //setCellRenderer(new NavTreeCellRenderer()); 
     fRowSelectionListener = new MouseAdapter() { 

      public void mousePressed(MouseEvent e) { 
       if (SwingUtilities.isLeftMouseButton(e)) { 
        int closestRow = fThis.getClosestRowForLocation(
          e.getX(), e.getY()); 
        Rectangle closestRowBounds = fThis.getRowBounds(closestRow); 
        if(e.getY() >= closestRowBounds.getY() && 
          e.getY() < closestRowBounds.getY() + 
          closestRowBounds.getHeight()) { 
         if(e.getX() > closestRowBounds.getX() && 
           closestRow < fThis.getRowCount()){ 

                fThis.setSelectionRow(closestRow); 
               } 

        } else 
         fThis.setSelectionRow(-1); 
       } 
      } 

     }; 
     setWholeRowSelectionEnabled(true); 
    } 

    public void setWholeRowSelectionEnabled(boolean wholeRowSelectionEnabled) { 
     fWholeRowSelectionEnabled = wholeRowSelectionEnabled; 
     if (fWholeRowSelectionEnabled) 
      addMouseListener(fRowSelectionListener); 
     else 
      removeMouseListener(fRowSelectionListener); 
    } 

    public boolean isWholeRowSelectionEnabled() { 
     return fWholeRowSelectionEnabled; 
    } 

    public static void main(String[] args) { 
     JFrame frame = new JFrame(); 
     DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root"); 
     root.add(new DefaultMutableTreeNode("Child 1")); 
     root.add(new DefaultMutableTreeNode("Child 2")); 
     root.add(new DefaultMutableTreeNode("Child 3")); 
     NavTree tree = new NavTree(root); 
     frame.add(tree); 
     frame.setSize(200, 300); 
     frame.setVisible(true); 
    } 
}

來源

2012-06-06 user881480

使用MouseEvent的修飾鍵信息。見MouseEvent#getModifiersEx更多信息

來源

2012-06-06 06:00:56 Robin

感謝先刪除它，並添加它，但它是一個有點依賴於平臺的，有沒有更好的辦法？ – user881480

只有平臺依賴於它需要帶鍵盤的平臺...... – Tharwen

PS：聽衆註冊包含錯誤

public void setWholeRowSelectionEnabled(boolean wholeRowSelectionEnabled) { 
    fWholeRowSelectionEnabled = wholeRowSelectionEnabled; 
    if (fWholeRowSelectionEnabled) 
     addMouseListener(fRowSelectionListener); 
    else 
     removeMouseListener(fRowSelectionListener); 
}

財產wholeRowSelectionEnabled設置爲true應該註冊聽衆只有一次。如果多次將屬性設置爲true，那麼您的代碼會一次又一次地添加偵聽器。我的意思是，財產製定者應該是idempotent。

了一個quickfix可能是，如果啓用

public void setWholeRowSelectionEnabled(boolean wholeRowSelectionEnabled) { 
    removeMouseListener(fRowSelectionListener); 
    fWholeRowSelectionEnabled = wholeRowSelectionEnabled; 
    if (fWholeRowSelectionEnabled) 
     addMouseListener(fRowSelectionListener); 
}

來源

2017-04-19 11:59:50

JTree通過單擊行上的任意位置來選擇節點

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