how to place mouse directly above a JOptionPane button in java?-CodePudding

As a button can be preselected to be hit by Enter key , is there an way to place mouse on a selected button of Joption pane Button ?

Thanks in advance

CodePudding user response：

Here is how I did it.
First, create an instance of

I did some experimenting and discovered that the JOptionPane instance contains two child components.

Component[] cmpts = oPane.getComponents();
for (Component cmpt : cmpts) {
    System.out.println(cmpt.getClass());
}

Each child is a JPanel. One of them contains the OK JButton.

Then I added a WindowListener to the JDialog. When the JDialog is displayed for the first time, I use a Robot to move the mouse pointer to the OK button.

javax.swing.JOptionPane oPane = new javax.swing.JOptionPane();
javax.swing.JDialog dlg = oPane.createDialog("Dialog Title");
dlg.addWindowListener(new java.awt.event.WindowAdapter() {
    public void windowOpened(java.awt.event.WindowEvent wndEvt) {
        javax.swing.JComponent jCmpt = (javax.swing.JComponent) oPane.getComponent(1);
        javax.swing.JButton button = (javax.swing.JButton) jCmpt.getComponent(0);
        java.awt.Point pt = button.getLocationOnScreen();
        try {
            java.awt.Robot robbie = new java.awt.Robot();
            robbie.mouseMove(pt.x, pt.y);
        }
        catch (java.awt.AWTException xAwt) {
            xAwt.printStackTrace();
        }
    }
});
dlg.setVisible(true);

Note that the above is simply a proof of concept (POC). I suggest that you investigate the API of the classes appearing in the above code in order to make it suitable for your requirements.

CodePudding user response：

The following is an mre demonstrating placing the mouse over JOptionPane button:

import java.awt.*;
import javax.swing.*;

public class MouseOverJOptionPaneButton {

    public static void main(String[] args) {

        JOptionPane optionPane = new JOptionPane();
        optionPane.setMessage("Mouse positioned over the button");
        optionPane.setMessageType(JOptionPane.INFORMATION_MESSAGE);
        JButton jButton = new JButton("OK");
        jButton.addActionListener(actionEvent -> {
            System.out.println(jButton.getText()  " pressed");
        });
        optionPane.setOptions(new Object[] { jButton });
        JDialog dialog = optionPane.createDialog("");
        //if modal, placeMouseOver is invoked after dialog closes
        //alternatively use WindowListener as in Arba's answer
        dialog.setModal(false);  
        dialog.setVisible(true);
        placeMouseOver(jButton);
        //todo, optionally:  dialog.setModal(true);
    }

    private static void placeMouseOver(JComponent comp) {
        try {
            //calculate center of component AFTER it is showing
            int xCoord = comp.getLocationOnScreen().x   comp.getWidth()/2;
            int yCoord = comp.getLocationOnScreen().y   comp.getHeight()/2;
            // Move the cursor
            new Robot().mouseMove(xCoord, yCoord);
        } catch (AWTException e) {
            e.printStackTrace();
        }
    }
}