[英]Jittering when trying to move undercorated JFrame
我制作了一個未修飾的名為mainWindow
JFrame
。 我在其頂部添加了一個名為dragBar
的JLabel
,並為其提供了所需的尺寸(如下所示)。 當我單擊標簽時,使用兩個偵聽器使窗口根據鼠標移動。 一個MouseListener
和一個MouseMotionListener
。
問題是,每當我單擊標簽時,窗口的確會根據鼠標的位置移動,但是在整個屏幕上都會閃爍,直到我停止移動鼠標或放開單擊按鈕。
我的方法錯了嗎? 是什么導致此問題? 這是我的代碼:
//what i use to make the dragBar
private JLabel dragBar = new JLabel();
private Point initialClick; //the initial point where I click on the label
//my mainWindow JFrame
private JFrame mainWindow = new JFrame();
private Dimension mainWindowSize = new Dimension(680,410);
//the code I use to set up my mainWindow JFrame
mainWindow.setUndecorated(true);
mainWindow.setShape(new RoundRectangle2D.Double(0, 0, 670, 400, 5, 5));
mainWindow.setSize(mainWindowSize);
mainWindow.setMinimumSize(mainWindowSize);
mainWindow.setResizable(false);
mainWindow.setLocation((screen_size.width/2)- mainWindow.getWidth()/2, (screen_size.height/2)- mainWindow.getHeight()/2);
mainWindow.getContentPane().setBackground(new Color(46, 48, 50, 255));
//the code I use to set up my dragBar label
topContainer.add(dragBar,3); //a Jlayeredpane that contains the dragBar label and is added to the mainWindow
dragBar.setSize(topContainer.getSize());
dragBar.setLocation(0,0);
dragBar.addMouseListener(new MouseListener() {
@Override public void mouseClicked(MouseEvent e) {}
@Override
public void mousePressed(MouseEvent e) {
initialClick = e.getPoint();
}
@Override public void mouseReleased(MouseEvent e) {}
@Override public void mouseEntered(MouseEvent e) {}
@Override public void mouseExited(MouseEvent e) {}
});
dragBar.addMouseMotionListener(new MouseMotionListener() {
@Override
public void mouseDragged(MouseEvent e) {
int changeX = e.getX()-initialClick.x;
int changeY = e.getY()-initialClick.y;
mainWindow.setLocation(mainWindow.getX()+changeX, mainWindow.getY()+changeY);
}
@Override public void mouseMoved(MouseEvent e) {}
});
包含dragBar標簽的Jlayeredpane
不要以為我會為此使用JLayeredPane。 只需將一個組件添加到框架的BorderLayout.PAGE_START
。
拖動組件的基本邏輯如下:
public class DragListener extends MouseInputAdapter
{
Point location;
MouseEvent pressed;
public void mousePressed(MouseEvent me)
{
pressed = me;
}
public void mouseDragged(MouseEvent me)
{
Component component = me.getComponent();
location = component.getLocation(location);
int x = location.x - pressed.getX() + me.getX();
int y = location.y - pressed.getY() + me.getY();
component.setLocation(x, y);
}
}
但是,在您的情況下,您不想拖動標簽,而是拖動窗口,則需要將事件轉發到窗口。
請查看“ 移動窗口”以獲取上述代碼的更復雜的實現,該代碼還添加了其他功能,可以輕松地移動窗口。
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