我已经为使用InputMap的Swing应用程序实现了一些热键,如
getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_A, Event.CTRL_MASK), "selectAll");
getActionMap().put("selectAll", new SelectAllAction());
它工作正常。现在,如果我想抓住
,我怎么能做同样的事情CTRL + MouseWheelUp
我尝试了一些组合,例如
getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(MouseEvent.MOUSE_WHEEL, Event.CTRL_MASK), "zoom");
没有运气
由于
答案 0 :(得分:6)
您不能使用InputMap / ActionMap。您需要使用MouseWheelListener。然后,侦听器可以从ActionMap访问自定义Action。这是一个使用“Control 1”进行KeyStroke的简单示例:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MouseWheelTest extends JPanel implements MouseWheelListener {
private final static String SOME_ACTION = "control 1";
public MouseWheelTest() {
super(new BorderLayout());
JTextArea textArea = new JTextArea(10, 40);
JScrollPane scrollPane = new JScrollPane(textArea);
add(scrollPane, BorderLayout.CENTER);
textArea.addMouseWheelListener(this);
Action someAction = new AbstractAction() {
public void actionPerformed(ActionEvent e) {
System.out.println("do some action");
}
};
// Control A is used by a text area so try a different key
textArea.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW)
.put(KeyStroke.getKeyStroke(SOME_ACTION), SOME_ACTION);
textArea.getActionMap().put(SOME_ACTION, someAction);
}
public void mouseWheelMoved(MouseWheelEvent e) {
if (e.isControlDown()) {
if (e.getWheelRotation() < 0) {
JComponent component = (JComponent)e.getComponent();
Action action = component.getActionMap().get(SOME_ACTION);
if (action != null)
action.actionPerformed( null );
} else {
System.out.println("scrolled down");
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowGUI();
}
});
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("MouseWheelTest");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new MouseWheelTest() );
frame.pack();
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
}
答案 1 :(得分:2)
就我而言,我想听取JPanel
,因此很容易使用MouseWheelListener
。
这是我的代码:
@Override
public void mouseWheelMoved(MouseWheelEvent e) {
if (e.isControlDown()) {
if (e.getWheelRotation() < 0) {
System.out.println("Zoom-in when scrolling up");
} else {
System.out.println("Zoom-out when scrolling down");
}
}
}
由于
答案 2 :(得分:0)
尝试使用InputEvent.CTRL_DOWN_MASK而不是Event.CTRL_MASK。根据JavaDoc:“建议改用CTRL_DOWN_MASK。”