jButtons 在运行时调整大小

Question

我想在运行时通过单击其边框并拖动它来调整JButton 的大小。谁能用示例代码解释我如何做到这一点。

public void mouseDragged(MouseEvent E)
{

Point point= E.getPoint();
//JButton get = floor_plan.dynamicButtons.get(E.getComponent());
JButton get=(JButton) E.getComponent();
int height = get.getHeight();
int width = get.getWidth();
int X=E.getXOnScreen();
int Y=E.getYOnScreen();
if(floor_plan.resize==1)
    if (floor_plan.isHeld) {
        System.out.println(X);
        System.out.println(Y);
        get.setPreferredSize(
              new Dimension(floor_plan.grabbedDimension.width -  
                                 (floor_plan.grabbedPoint.x - point.x), 
                            floor_plan.grabbedDimension.height - 
                                 (floor_plan.grabbedPoint.y - point.y)));
        get.setBounds(new Rectangle(get.getLocation(), get.getPreferredSize()));
        return;
    }
    System.out.println("height:"+height);
    System.out.println("width:"+width);
    get.setBounds(X-240,Y-125,height,width);

}

Answer 1

• 将 MouseListener 附加到按钮
• 将 MouseMotionListener 附加到 按钮
• 在鼠标按下您注册 MouseEvent 的位置
• 开启 鼠标拖你注册新 您采取的 MouseEvent 的位置 两个事件的增量并添加 使用按钮的大小 setSize/setPreferredSize/随便 他们被称为

Answer 2

嗯，这可能对你有用。添加新按钮时，只需添加 ResizableButton。

注意，无论你在哪里点击它都会调整大小。

public class ResizableButton extends JButton {

    private Point grabbedPoint;
    private Dimension grabbedDimension;

    private boolean isHeld = false;

    public ResizableButton(String name) {
        super(name);
        addMouseListener(clickListener);
        addMouseMotionListener(moveListener);
    }

    private MouseMotionListener moveListener = new MouseMotionAdapter() {
        @Override
        public void mouseDragged(MouseEvent e) {
            if (isHeld) {
                Point newP = e.getPoint();
                setPreferredSize(new Dimension(grabbedDimension.width
                        - (grabbedPoint.x - newP.x), grabbedDimension.height
                        - (grabbedPoint.y - newP.y)));
                setBounds(new Rectangle(getLocation(), ResizableButton.this
                        .getPreferredSize()));
            }
        }
    };

    private MouseListener clickListener = new MouseAdapter() {

        @Override
        public void mouseReleased(MouseEvent e) {
            isHeld = false;
        }

        @Override
        public void mousePressed(MouseEvent e) {
            isHeld = true;
            grabbedPoint = e.getPoint();
            grabbedDimension = ((JButton) e.getSource()).getSize();
        }
    };
}

---

以下是根据是否按下 Alt 按钮来移动或调整大小的按钮的代码。：

public class MovableResizableButton extends JButton {

    private boolean isHeld;
    private Point pointClicked;
    private Dimension startingSize;

    public MovableResizableButton(String name) {
        super(name);
        addMouseMotionListener(new MouseMotionAdapter() {
            @Override
            public void mouseDragged(MouseEvent e) {
                if (isHeld) {
                Dimension newSize = getPreferredSize();
                Point newPoint = getLocation();
                if ((e.getModifiersEx() & InputEvent.ALT_DOWN_MASK) == InputEvent.ALT_DOWN_MASK) {
                    newSize = new Dimension(startingSize.width - (pointClicked.x - e.getPoint().x),
                                            startingSize.height -(pointClicked.y - e.getPoint().y));
                }else {
                    Point startPoint = getLocation();
                    newPoint = new Point(startPoint.x - (pointClicked.x - e.getPoint().x), 
                                         startPoint.y - (pointClicked.y - e.getPoint().y));
                }
                setPreferredSize(newSize);
                setBounds(new Rectangle(newPoint, getPreferredSize()));
                }
            }
        });
        addMouseListener(new MouseAdapter() {
            @Override
            public void mousePressed(MouseEvent e) {
                pointClicked = e.getPoint();
                startingSize = getSize();
                isHeld = true;
            }
            @Override
            public void mouseReleased(MouseEvent e) {
                isHeld = false;
            }
        });
    }
}

Answer 3

试试

http://tips4java.wordpress.com/2009/09/13/resizing-components/

用于移动组件

http://tips4java.wordpress.com/2009/06/14/moving-windows/