英文:
dragable JPanel keeps jumping back to center when edited
问题
我有一个带有文本字段的JPanel（textPanel）。出于某些原因，我将textPanel添加到另一个面板（contentPanel），然后再添加到JFrame中。我已经为textPanel添加了一个MouseListener，以便我可以拖动它。新位置是通过方法调用setLocation（...）来设置的。
每当我开始编辑文本字段时，文本面板就会从其实际位置跳回到JFrame的中心。- 为什么？我需要更改什么？
public void run() {
area1 = new JTextArea();
area1.setText("Hello!");
GridBagLayout layout = new GridBagLayout();
GridBagConstraints cc = new GridBagConstraints();
cc.fill = GridBagConstraints.NONE;
textPanel = new JPanel(layout);
cc.anchor = GridBagConstraints.PAGE_START;
cc.gridx = 0;
textPanel.add(area1, cc);
JPanel contentPanel = new JPanel(new GridBagLayout());
cc = new GridBagConstraints();
cc.anchor = GridBagConstraints.FIRST_LINE_START;
cc.gridx = 0;
cc.gridy = 0;
cc.weightx = 1;
cc.weighty = 1;
MyMouseAdapter mh = new MyMouseAdapter();
textPanel.addMouseListener(mh);
textPanel.addMouseMotionListener(mh);
contentPanel.add(textPanel, cc);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(contentPanel);
frame.setSize(800, 600);
frame.setVisible(true);
}
英文:
I have a JPanel with a textfield (textPanel). I added the textPanel for some reasons to another panel (contentPanel) and that to the JFrame. I have added a MouseListener to the textPanel, so that I can drag it around. The new Position is set by the methodcall setLocation (...)
Everytime I start editing the textfield, the textpanel jumps back from its actual location to the center of the JFrame. – Why? What do I have to change?
public void run() {
area1 = new JTextArea();
area1.setText("Hello!");
GridBagLayout layout = new GridBagLayout();
GridBagConstraints cc = new GridBagConstraints();
cc.fill = GridBagConstraints.NONE;
textPanel = new JPanel(layout);
cc.anchor = GridBagConstraints.PAGE_START;
cc.gridx = 0;
textPanel.add(area1, cc);
JPanel contentPanel = new JPanel(new GridBagLayout());
cc = new GridBagConstraints();
cc.anchor = GridBagConstraints.FIRST_LINE_START;
cc.gridx = 0;
cc.gridy = 0;
cc.weightx = 1;
cc.weighty = 1;
MyMouseAdapter mh = new MyMouseAdapter();
textPanel.addMouseListener(mh);
textPanel.addMouseMotionListener(mh);
contentPanel.add(textPanel, cc);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(contentPanel);
frame.setSize(800, 600);
frame.setVisible(true);
}
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