Java JMenuItem并输入键released
我有一个Java JMenuItem并输入键released,java,swing,keyboard-events,jmenuitem,keyrelease,Java,Swing,Keyboard Events,Jmenuitem,Keyrelease,我有一个JMenuItem，我想接收用户输入。用户必须能够通过鼠标或键盘启动项目的功能 该项的功能包含要打开的JDialog。此对话框将侦听已释放的ENTER键，并在释放ENTER键时启动自己的功能 当用户使用ENTER（按键）点击JMenuItem时，他将打开对话框。当他放开回车键时，他将-这就是问题所在--导致对话框功能启动。（当用户松开ENTER键时，他将向现在打开的JDialog触发一个事件。我不想这样。我想要两个单独的步骤：1：使用ENTER（完成笔划或ENTER释放）选择JMenuI
JMenuItem该项的功能包含要打开的
JDialogJMenuItemJDialogJMenuItemJMenuItemJMenuItemimport java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRootPane;
import javax.swing.KeyStroke;
import javax.swing.MenuElement;
import javax.swing.MenuSelectionManager;
public class MenuItemProblem {
public static void openDialog(JFrame frame){
Action enterReleasedAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
// This action shall be triggered by releasing
// the enter key in the JDialog.
// (There are two times events of the released enter key shall be
// evaluated during the application runs, of which this is the second one.)
// But: It is triggered by the first release of enter in the application,
// which is the one to choose the menu item.
System.out.println("Dialog: Enter was released!");
}
};
JDialog dialog = new JDialog(frame, "My dialog", true);
JRootPane rootPane = dialog.getRootPane();
ActionMap actionMap = rootPane.getActionMap();
String enterReleased = "my_enter_released_function";
actionMap.put(enterReleased, enterReleasedAction);
InputMap inputMap = rootPane.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
// Keystroke for releasing the enter key
inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true), enterReleased);
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setMinimumSize(new Dimension(260, 300));
dialog.setResizable(true);
dialog.pack();
dialog.setLocationRelativeTo(frame);
dialog.setVisible(true);
}
public static void main(String[] args) {
JFrame frame = new JFrame("My App");
JMenuItem item = new JMenuItem("My item");
item.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// By releasing enter (and mouse clicks, space and so on)
// this action shall be triggered.
// It shall not be triggered by enter key pressed,
// for this would cause the action of the called dialog
// do be triggered.
// But: It is triggered by enter pressed!
// (There are two times events of the released enter key shall be
// evaluated during the application runs, of which this is the first one.)
System.out.println("Choosing the menu item");
openDialog(frame);
}
});
JMenu menu = new JMenu("My menu");
menu.add(item);
JMenuBar bar = new JMenuBar();
bar.add(menu);
// Register alt key to be caught
Action altAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
MenuElement[] elements = MenuSelectionManager.defaultManager().getSelectedPath();
if(elements.length > 0){
MenuSelectionManager.defaultManager().clearSelectedPath();
} else{
menu.doClick();
}
}
};
JRootPane rootPane = frame.getRootPane();
ActionMap actionMap = rootPane.getActionMap();
String altActionKey = "alt_key_for_menu";
actionMap.put(altActionKey, altAction);
InputMap inputMap = rootPane.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
KeyStroke ks = KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0, true);
inputMap.put(ks, altActionKey);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setJMenuBar(bar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
提前感谢并感谢您的努力！好的，问题解决了。我没有尝试调整API，而是调整了对话框功能的触发方式。详细地说，我将触发器从ENTER released更改为ENTER typed。一些示例代码了解了我所做的工作：
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRootPane;
import javax.swing.KeyStroke;
import javax.swing.MenuElement;
import javax.swing.MenuSelectionManager;
public class MenuItemSolution {
public static void openDialog(JFrame frame){
Action enterTypedAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Dialog: Enter was typed!");
}
};
JDialog dialog = new JDialog(frame, "My dialog", true);
JRootPane rootPane = dialog.getRootPane();
ActionMap actionMap = rootPane.getActionMap();
String enterTyped = "my_enter_typed_function";
actionMap.put(enterTyped, enterTypedAction);
InputMap inputMap = rootPane.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
// This is the point of change: I just created a KeyStroke to
// deal with ENTER key typed instead of ENTER key released.
// Only problem left (which doesn't matter in my use case):
// Key typed events can occur several time when holding down the ENTER key.
inputMap.put(KeyStroke.getKeyStroke('\n'), enterTyped);
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setMinimumSize(new Dimension(260, 300));
dialog.setResizable(true);
dialog.pack();
dialog.setLocationRelativeTo(frame);
dialog.setVisible(true);
}
public static void main(String[] args) {
JFrame frame = new JFrame("My App");
JMenuItem item = new JMenuItem("My item");
item.addActionListener((ActionEvent e) -> {
openDialog(frame);
});
JMenu menu = new JMenu("My menu");
menu.add(item);
JMenuBar bar = new JMenuBar();
bar.add(menu);
// Register alt key to be caught
Action altAction = new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
MenuElement[] elements = MenuSelectionManager.defaultManager().getSelectedPath();
if(elements.length > 0){
MenuSelectionManager.defaultManager().clearSelectedPath();
} else{
menu.doClick();
}
}
};
JRootPane rootPane = frame.getRootPane();
ActionMap actionMap = rootPane.getActionMap();
String altActionKey = "alt_key_for_menu";
actionMap.put(altActionKey, altAction);
InputMap inputMap = rootPane.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
KeyStroke ks = KeyStroke.getKeyStroke(KeyEvent.VK_ALT, 0, true);
inputMap.put(ks, altActionKey);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setJMenuBar(bar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
第一种方法：
设置计时器，以对新打开的对话框中输入的按键释放事件作出反应。
第二种方法：
在处理
ENTERENTERJMenuJMenuItemEnterJMenuItemActionListenerKeyListener