将 JPanel 的一个元素锁定到位

如何解决将 JPanel 的一个元素锁定到位

我知道已经发布了一个类似的问题 :: GUI FlowLayout,lock all components position

但是，我想将一个 JPanel 锁定在其位置，同时让另一个 JLabel 保持可移动。 （那个 JLabel 是制作出来的，应该是可以拖动和移动的。）

我希望这个 JLabel 在 JPanel 上移动，这里是 MouseAdapter 代码，同样来自 StackOverflow dragging a jlabel around the screen ::

MouseAdapter ma = new MouseAdapter() {
            JLabel selectedLabel = null; //Clicked label.
            Point selectedLabelLocation = null; //Location of label in panel when it was clicked.
            Point panelClickPoint = null; //Panel's click point.

            //Selection of label occurs upon pressing on the panel:
            @Override
            public void mousePressed(final MouseEvent e) {

                //Find which label is at the press point:
                final Component pressedComp = colorPanel.findComponentAt(e.getX(),e.getY());

                //If a label is pressed,store it as selected:
                if (pressedComp != null && pressedComp instanceof JLabel) {
                    selectedLabel = (JLabel) pressedComp;
                    selectedLabelLocation = selectedLabel.getLocation();
                    panelClickPoint = e.getPoint();
                    //Added the following 2 lines in order to make selectedLabel
                    //paint over all others while it is pressed and dragged:
                    colorPanel.setComponentZOrder(selectedLabel,0);
                    selectedLabel.repaint();
                }
                else {
                    selectedLabel = null;
                    selectedLabelLocation = null;
                    panelClickPoint = null;
                }
            }

            //Moving of selected label occurs upon dragging in the panel:
            @Override
            public void mouseDragged(final MouseEvent e) {
                if (selectedLabel != null
                        && selectedLabelLocation != null
                        && panelClickPoint != null) {

                    final Point newPanelClickPoint = e.getPoint();

                    //The new location is the press-location plus the length of the drag for each axis:
                    final int newX = selectedLabelLocation.x + (newPanelClickPoint.x - panelClickPoint.x),newY = selectedLabelLocation.y + (newPanelClickPoint.y - panelClickPoint.y);

                    selectedLabel.setLocation(newX,newY);
                   }
            }
        };
        colorPanel.addMouseMotionListener(ma); //For mouseDragged().
        colorPanel.addMouseListener(ma); //For mousePressed().

然而，当我拖动我心爱的小 JLabel 时（我已经把它缩小了），有时我会不小心抓住 JPanel 而 它 会四处移动。

这是我想要的图片（在移动任何东西之前）。

（PS 也来自 StackOverflow... Creating a color chooser JSlider to effect the fill color of rectangle ）

我想在 JPanel 上拖动 JLabel，以便用户可以选择颜色。但有时（如上所述）我会拿起 JPanel，看起来像 :: https://i.stack.imgur.com/xUB2g.png 奇怪的是 :: https://i.stack.imgur.com/WJ2tP.png

有没有办法将我的 JPanel（渐变）锁定到它所在的另一个？我尝试将 setResizable(false) 添加到较大的 JFrame，但是之后我的 JLabel 无法移动。有没有办法在不影响我的 JLabel 的情况下锁定 JPanel？ TIA。