需要帮助在JTextArea中实现mouselistener [英] Need help implementing mouselistener in JTextArea

问题描述

大家好，我正在使用JTextArea在Java swing中编写一个简单的gui编辑器.但现在我希望能够右键单击并具有剪切，复制，粘贴和选择所有字体以及可能更改字体的选项.在实现JTextArea中的剪切，复制或粘贴选项时，我需要帮助.帮助将不胜感激. 以下是我的代码段:

Hello guys i am writing a simple gui editor in java swing using JTextArea. but now i want to be able to right click and have the options to cut, copy, paste and select all and possibly change fonts. I need help in implementing the option of cutting, copying or pasting in the JTextArea. Help will be appreciated. Below is a snippet of my code:

public class Example extends JPanel
{
    private JTextArea area;
    private JScrollPane scpane;

    public Example()
    {
        super("My Text Editor");
        setUp();
    }

    private void setUp()
    {
        area = new JTextArea();
        scpane= new JScrollPane(area);

        area.addMouseListener(
            new MouseAdapter()
            {
                public void mousePressed(MouseEvent e)
                {
                    if(e.getButton()==MouseEvent.BUTTON3)
                    {
                        //having difficulty how to set up the copy, cut or paste option 
                        //with the mouse in JTextArea.
                    }
                }
            });
        }
    }
}

推荐答案

首先查看

Start by taking a look at JComponent#setComponentPopupMenu which will allow you to associate a JPopupMenu with a component and have it automatically displayed when the user triggers the appropriate, system specific, trigger.

接下来，看看:

• JTextArea#copy
• JTextArea#cut
• JTextArea#past
• JTextArea#selectAll

现在，如果您真的很聪明，您可以提取关联的Action，以便JTextArea的键绑定的复制/剪切/粘贴操作将您自己的Action包裹在它们周围，并将它们应用于您的JPopupMenu并免费获得所有内容...

Now, if you're really clever, you would extract the associated Actions for the copy/cut/paste operations of the JTextAreas key bindings are wrap your own Action around them, appling those to your JPopupMenu and get it all for free...

例如...

    JTextArea ta = new JTextArea();
    ActionMap am = ta.getActionMap();

    Action paste = am.get("paste-from-clipboard");
    Action copy = am.get("copy-to-clipboard");
    Action cut = am.get("cut-to-clipboard");

请参见如何使用操作和如何使用键绑定了解更多详情

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