SwingUtilities.getLocationOnScreen()的问题；

Question

我在JButton "support“上的ActionListener中有以下代码。cl.across.text是我的图形用户界面中的另一个JTextArea。问题出在点pt1的结果上。框架是600x600，按钮在中间按钮，而JTextArea在中间右边。打印命令的结果是: java.awt.Pointx=501，y=187 java.awt.Pointx=370，y=1062现在第一个坐标是正确的(用MouseListener检查)，但第二个坐标完全超出了范围，它们甚至超出了我的框架(考虑它是600和y=1062)。任何建议如何获得正确的，因为我需要做一个机器人，按下是，这是我唯一的想法，以获得它与调整图形用户界面。

代码：

Point pt=new Point(cl.across.text.getLocation());
SwingUtilities.convertPointToScreen(pt, cl.across.text);
Point pt1=new Point(support.getLocation());
SwingUtilities.convertPointToScreen(pt1, support);
System.out.println(pt+" "+pt1);

Answer 1

我认为你得到不正确的点坐标的原因是SwingUtilities.convertPointToScreen(point, component);方法的不正确使用。

不要担心，当我第一次使用这个方法时，我犯了同样的错误。:)

从对方法Component.getLocation()的描述中，我们可以得到它返回的内容：“一个Point的实例，表示组件的父级坐标空间中组件边界的左上角。”

因此，作为组件参数，我们需要给它的父对象，例如SwingUtilities.convertPointToScreen(point, component.getParent());

因此，对于您的情况，您将拥有：

Point pt=new Point(cl.across.text.getLocation());
SwingUtilities.convertPointToScreen(pt, cl.across.text.getParent());
Point pt1=new Point(support.getLocation());
SwingUtilities.convertPointToScreen(pt1, support.getParent());
System.out.println(pt+" "+pt1);

示例：在此示例中，您可以看到getLocationOnScreen()是如何“足够好”让机器人完成其工作的，并且它返回的结果与“正确”使用SwingUtilities.convertPointToScreen()方法返回的结果相同。

要查看它的工作情况，请从示例开始，将手从鼠标上移开，等待几秒钟。

import java.awt.AWTException;
import java.awt.Point;
import java.awt.Robot;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class RobotLocOnScreenTest{
    public static void main(String[] args){
        final JTextArea ta = new JTextArea(21, 12);
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run(){
                JFrame f = new JFrame();
                JPanel p = new JPanel();
                JTextField tf = new JTextField("asadasdasd", 15);
                p.add(tf);
                p.add(ta);
                p.add(new JTextField(11));
                f.setContentPane(p);
                f.setSize(800, 600);
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.setVisible(true);
                //request focus so the text field tf has it first
                tf.requestFocusInWindow();
            }
        });
        /* A hack to allow the GUI to build so we can see all robot's operations on the area 
        * and avoid the IllegalComponentStateException exception thrown by
        * Component.getLocationOnScreen() method when the component is not showing.
        */
        try{
            Thread.sleep(2000);
        }catch(InterruptedException ex) {
            Logger.getLogger(RobotLocOnScreenTest.class.getName()).log(Level.SEVERE, null, ex);
        }
        findAndOperateOnTextArea(ta);           
    }

    private static void findAndOperateOnTextArea(JTextArea ta){
        try{
            Robot robot = new Robot();
            Point taLOSP = ta.getLocationOnScreen();
            Point taLPBad = ta.getLocation();
            SwingUtilities.convertPointToScreen(taLPBad, ta);           
            Point taLPGood = ta.getLocation();
            SwingUtilities.convertPointToScreen(taLPGood, ta.getParent());
            System.out.println("ta.getLocationOnScreen()=" + taLOSP 
                    + "; taLPBad=" + taLPBad+"; taLPGood="+taLPGood);           
            robot.mouseMove(taLOSP.x, taLOSP.y);
            robot.delay(1111);
            robot.mousePress(InputEvent.BUTTON1_MASK);
            robot.mouseRelease(InputEvent.BUTTON1_MASK);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_0);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_1);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_2);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_3);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_4);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_5);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_6);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_7);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_8);
            robot.delay(333);
            robot.keyPress(KeyEvent.VK_9);
        }catch(AWTException ex){
            Logger.getLogger(RobotLocOnScreenTest.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

Answer 2

'pt‘是一个屏幕坐标点。所以你想用SwingUtilities.convertPointFromScreen(pt，frame)把它转换成你的帧的坐标。